[0001]
　The present disclosure relates to a base station device, a terminal device and a method.
Background technology
[0002]
　Wireless access method and wireless network for cellular mobile communication (hereinafter, "Long Term Evolution (LTE)", "LTE-Advanced (LTE-A)", "LTE-Advanced Pro (LTE-A Pro)", "New Radio ( NR)”, “New Radio Access Technology (NRAT)”, 5G, “Evolved Universal Terrestrial Radio Access (EUTRA)”, or “Further EUTRA (FEUTRA)”) is a third generation partnership project (3rd Generation Partnership). Project: 3GPP). In the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includes NRAT and FEUTRA. In LTE, a base station device (base station) is an eNodeB (evolved NodeB), in NR, a base station device (base station) is a gNodeB, and in LTE and NR, a terminal device (mobile station, mobile station device, terminal) is a UE (User Equipment). Also called. LTE and NR are cellular communication systems in which a plurality of areas covered by a base station device are arranged in a cell shape. A single base station device may manage a plurality of cells.
[0003]
　NR is RAT (Radio Access Technology) different from LTE as a next-generation radio access scheme for LTE. NR is an access technology that can support various use cases including eMBB (Enhanced mobile broadband), mMTC (Massive machine type communications), and URLLC (Ultra reliable and low latency communications). The NR is examined aiming at a technical framework corresponding to usage scenarios, requirements, and placement scenarios in those use cases.
[0004]
　Further, in NR, a study on a non-terrestrial network (Non-Terrestrial Network) in which a wireless network is provided from a device floating in the air or in space has been started due to an increase in requirements such as wide area coverage and connection stability. In the non-terrestrial network, a wireless network is provided to a terrestrial terminal device (earth terminal device described later) via a satellite station device or a non-ground station device such as an aircraft. Further, in the non-terrestrial network, by using the same radio access method as the terrestrial network (Terrestrial Network), integrated operation between the terrestrial network and the non-terrestrial network becomes easy. The outline of the non-terrestrial network is disclosed in Non-Patent Document 1.
Prior art documents
Non-patent literature
[0005]
Non-Patent Document 1: PR-170717, Thales, Dish network, et al, “Study on NR to support Non-Terrestrial Networks,” 3GPP TSG RAN Meeting#75, Dubrovnik, Croatia, March, 2017.
Summary of the invention
Problems to be Solved by the Invention
[0006]
　The communication performed between the non-ground station device and the terrestrial terminal device has a larger propagation delay than the communication performed between the base station device provided on the ground and the terrestrial terminal device. However, a communication adaptive control method in a communication environment with such a large propagation delay has not been studied so far. As a result, the radio link quality regarding the communication performed between the non-ground station device and the terrestrial terminal device was not sufficient.
[0007]
　Therefore, the present disclosure proposes a mechanism capable of improving the wireless link quality of the communication performed between the non-ground station device and the ground terminal device.
Means for solving the problems
[0008]
　According to the present disclosure, a base station device configured as a satellite station device, and based on information about the base station device, setting information about transmission parameters used for transmitting a signal from the terminal device to the base station device. There is provided a base station device comprising: a control unit for transmitting to the terminal device.
[0009]
　Further, according to the present disclosure, the setting information based on the information about the base station device configured as the satellite station device, the setting information about the transmission parameter used for transmitting the signal from the terminal device to the base station device, There is provided a terminal device including: a control unit that acquires and transmits the signal using the transmission parameter according to the setting information.
[0010]
　Further, according to the present disclosure, there is provided a method executed by a base station device configured as a satellite station device, comprising: transmitting a signal from a terminal device to the base station device based on information about the base station device. And transmitting to the terminal device configuration information regarding the transmission parameters used.
Effect of the invention
[0011]
　As described above, according to the present disclosure, there is provided a mechanism capable of improving the wireless link quality of communication performed between a non-ground station device and a ground terminal device. Note that the above effects are not necessarily limited, and together with the above effects, or instead of the above effects, any of the effects shown in this specification, or other effects that can be grasped from this specification. May be played.
Brief description of the drawings
[0012]
FIG. 1 is a diagram showing an example of setting a component carrier according to the present embodiment.
FIG. 2 is a diagram showing an example of setting a component carrier according to the present embodiment.
FIG. 3 is a diagram showing an example of an NR downlink subframe according to the present embodiment.
FIG. 4 is a diagram showing an example of an NR uplink subframe according to the present embodiment.
FIG. 5 is a schematic block diagram showing the configuration of a base station device according to the present embodiment.
FIG. 6 is a schematic block diagram showing the configuration of a terminal device according to the present embodiment.
FIG. 7 is a flowchart showing an example of an initial connection procedure of the terminal device according to the present embodiment.
FIG. 8 is a sequence diagram showing an example of a flow of a collision-based RACH procedure according to this embodiment.
FIG. 9 is a sequence diagram showing an example of the flow of a non-collision RACH procedure according to the present embodiment.
FIG. 10 is a diagram for explaining an example of uplink synchronization adjustment according to the present embodiment.
FIG. 11 is a diagram for explaining an example of uplink synchronization adjustment according to the present embodiment.
FIG. 12 is a sequence diagram showing an example of the flow of an uplink synchronization adjustment procedure according to the present embodiment.
FIG. 13 is a diagram showing an example of a non-terrestrial network according to the present embodiment.
FIG. 14 is a diagram for explaining an example of cells provided by the satellite station device according to the present embodiment.
FIG. 15 is a diagram for explaining an example of a cell provided by the low earth orbit satellite station device according to the present embodiment.
FIG. 16 is a diagram for explaining an example of a functional configuration of the satellite station device according to the present embodiment.
FIG. 17 is a diagram for explaining an example of a functional configuration of the earth terminal device according to the present embodiment.
FIG. 18 is a sequence diagram showing an example of a flow of a first procedure for transmission parameter control executed in the system according to the present embodiment.
FIG. 19 is a sequence diagram showing an example of a flow of a second procedure for transmission parameter control executed in the system according to the present embodiment.
FIG. 20 is a sequence diagram showing an example of a flow of a third procedure for transmission parameter control executed in the system according to the present embodiment.
FIG. 21 is a block diagram showing a first example of a schematic configuration of an eNB.
FIG. 22 is a block diagram showing a second example of a schematic configuration of an eNB.
FIG. 23 is a block diagram showing an example of a schematic configuration of a smartphone.
FIG. 24 is a block diagram showing an example of a schematic configuration of a car navigation device.
MODE FOR CARRYING OUT THE INVENTION
[0013]
　Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted. Also, unless stated otherwise, all techniques, functions, methods, configurations, procedures, and all other descriptions described below are applicable to LTE and NR.
[0014]
　Further, in the following description, when a term specific to NR is particularly referred to, the term may be prefixed with “NR−”. For example, a PRACH (Physical Random Access Channel) peculiar to NR can be expressed as NR-PRACH. On the other hand, a term not prefixed with “NR−” may be regarded as a term specific to NR or a term not specific to NR (for example, LTE term). For example, “PRACH” may be regarded as NR-PRACH or LTE PRACH.
[0015]
　The description will be given in the following order.
　　1. Introduction
　　2. Technical issues
　　3. Functional configuration example
　　4. Technical features
　　5. Modification
　　6. Application example
　　7. Summary
[0016]
　<<1. Introduction>>
　　 In the present embodiment, the wireless communication system includes at least a base station device 100 and a terminal device 200. The base station device 100 can accommodate a plurality of terminal devices 200. The base station device 100 can be connected to another base station device 100 by means of an X2 interface. Further, the base station device 100 can be connected to an EPC (Evolved Packet Core) by means of the S1 interface. Furthermore, the base station apparatus 100 can be connected to an MME (Mobility Management Entity) by means of the S1-MME interface and can be connected to an S-GW (Serving Gateway) by means of the S1-U interface. The S1 interface supports a many-to-many connection between the MME and/or S-GW and the base station device 100. Further, in the present embodiment, the base station device 100 and the terminal device 200 respectively support LTE and/or NR.
[0017]
　　 In this embodiment, the base station apparatus 100 and the terminal apparatus 200 each support one or more radio access technologies (RAT). For example, RAT includes LTE and NR. One RAT corresponds to one cell (component carrier). That is, when multiple RATs are supported, the RATs correspond to different cells. In the present embodiment, a cell is a combination of downlink resources, uplink resources, and/or side links. Further, in the following description, a cell corresponding to LTE is referred to as an LTE cell, and a cell corresponding to NR is referred to as an NR cell.
[0018]
　The downlink communication is communication from the base station device 100 to the terminal device 200. The downlink transmission is transmission from the base station device 100 to the terminal device 200, and is transmission of a downlink physical channel and/or a downlink physical signal. The uplink communication is communication from the terminal device 200 to the base station device 100. In the following, the downlink physical channel and the downlink physical signal transmitted in downlink are also collectively referred to as a downlink signal. The uplink transmission is transmission from the terminal device 200 to the base station device 100, and is transmission of an uplink physical channel and/or an uplink physical signal. In the following, the uplink physical channel and the uplink physical signal transmitted in uplink are also collectively referred to as an uplink signal. The side link communication is communication from the terminal device 200 to another terminal device 200. Sidelink transmission is transmission from the terminal device 200 to another terminal device 200, and is transmission of a sidelink physical channel and/or a sidelink physical signal. Hereinafter, the sidelink physical channel and the sidelink physical signal transmitted by the sidelink are also collectively referred to as a sidelink signal.
[0019]
　The side link communication is defined for proximity direct detection and proximity direct communication between the terminal devices 200. Sidelink communication can use the same frame configuration as the uplink and downlink. In addition, side link communication may be limited to a part (subset) of uplink resources and/or downlink resources.
[0020]
　The base station device 100 and the terminal device 200 can support communication using a set of one or more cells in the downlink, the uplink, and/or the side link. Communication by a set of a plurality of cells or a set of a plurality of cells is also called carrier aggregation or dual connectivity. The details of carrier aggregation and dual connectivity will be described later. Further, each cell uses a predetermined frequency bandwidth. The maximum value, the minimum value, and the settable value in a predetermined frequency bandwidth can be defined in advance.
[0021]
　FIG. 1 is a diagram showing an example of setting a component carrier according to the present embodiment. In the example of FIG. 1, one LTE cell and two NR cells are set. One LTE cell is set as a primary cell. The two NR cells are set as a primary secondary cell and a secondary cell, respectively. The two NR cells are integrated by carrier aggregation. Further, the LTE cell and the NR cell are integrated by dual connectivity. The LTE cell and the NR cell may be integrated by carrier aggregation. In the example of FIG. 1, since the NR can be assisted in connection by the LTE cell that is the primary cell, it may not support some functions such as the function for stand-alone communication. Functions for stand-alone communication include functions necessary for initial connection.
[0022]
　FIG. 2 is a diagram showing an example of setting of component carriers according to the present embodiment. In the example of FIG. 2, two NR cells are set. The two NR cells are set as a primary cell and a secondary cell, respectively, and are integrated by carrier aggregation. In this case, since the NR cell supports a function for stand-alone communication, the LTE cell does not need to be assisted. Note that the two NR cells may be integrated by dual connectivity.
[0023]
　　 In
　each NR cell, one or more predetermined parameters are used in a predetermined predetermined time length (for example, subframe). That is, in the NR cell, the downlink signal and the uplink signal are generated using one or more predetermined parameters for a predetermined time length. In other words, the terminal device 200 generates the downlink signal transmitted from the base station device 100 and the uplink signal transmitted to the base station device 100 with one or more predetermined parameters for a predetermined time length. Is assumed to be done. Further, in the base station device 100, the downlink signal transmitted to the terminal device 200 and the uplink signal transmitted from the terminal device 200 are generated with one or more predetermined parameters for a predetermined time length. Can be set to When a plurality of predetermined parameters are used, the signals generated using those predetermined parameters are multiplexed by a predetermined method. For example, the predetermined method includes FDM (Frequency Division Multiplexing), TDM (Time Division Multiplexing), CDM (Code Division Multiplexing), and/or SDM (Spatial Division Multiplexing).
[0024]
　FIG. 3 is a diagram showing an example of NR downlink subframes according to the present embodiment. In the example of FIG. 3, the signals generated using the parameter set 1, the parameter set 0, and the parameter set 2 are FDMed in the cell (system bandwidth). The diagram shown in FIG. 3 is also referred to as an NR downlink resource grid. The base station apparatus 100 can transmit the NR downlink physical channel and/or the NR downlink physical signal in the downlink subframe to the terminal apparatus 200. The terminal device 200 can receive the NR downlink physical channel and/or the NR downlink physical signal in the downlink subframe from the base station device 100.
[0025]
　FIG. 4 is a diagram showing an example of an NR uplink subframe according to the present embodiment. In the example of FIG. 4, the signals generated using the parameter set 1, the parameter set 0, and the parameter set 2 are FDMed in the cell (system bandwidth). The diagram shown in FIG. 4 is also referred to as an NR uplink resource grid. The base station device 100 can transmit the NR uplink physical channel and/or the NR uplink physical signal in the uplink subframe to the terminal device 200. The terminal device 200 can receive the NR uplink physical channel and/or the NR uplink physical signal in the uplink subframe from the base station device 100.
[0026]
　In this embodiment, the physical resource can be defined as follows. One slot is defined by a plurality of symbols. The physical signal or channel transmitted in each of the slots is represented by a resource grid. In the downlink, the resource grid is defined by a plurality of subcarriers in the frequency direction and a plurality of OFDM symbols in the time direction. In the uplink, the resource grid is defined by a plurality of subcarriers in the frequency direction and a plurality of OFDM symbols or SC-FDMA symbols in the time direction. The number of subcarriers or resource blocks may be determined depending on the cell bandwidth. The number of symbols in one slot depends on the type of CP (Cyclic Prefix). The type of CP is a normal CP or an extended CP. In a normal CP, the number of OFDM symbols or SC-FDMA symbols forming one slot is 7. In the extended CP, the number of OFDM symbols or SC-FDMA symbols forming one slot is 6. Each of the elements in the resource grid is called a resource element. A resource element is identified using a subcarrier index (number) and a symbol index (number). In the description of this embodiment, the OFDM symbol or SC-FDMA symbol is also simply referred to as a symbol.
[0027]
　The resource block is used to map a certain physical channel (such as PDSCH or PUSCH) to a resource element. Resource blocks include virtual resource blocks and physical resource blocks. Certain physical channels are mapped to virtual resource blocks. Virtual resource blocks are mapped to physical resource blocks. One physical resource block is defined by a predetermined number of consecutive symbols in the time domain. One physical resource block is defined by a predetermined number of consecutive subcarriers in the frequency domain. The number of symbols and the number of subcarriers in one physical resource block are determined based on the type of CP in the cell, the subcarrier spacing, and/or parameters set by the upper layer. For example, when the CP type is a normal CP and the subcarrier spacing is 15 kHz, the number of symbols in one physical resource block is 7 and the number of subcarriers is 12. In that case, one physical resource block is composed of (7×12) resource elements. Physical resource blocks are numbered from 0 in the frequency domain. Further, two resource blocks in one subframe corresponding to the same physical resource block number are defined as a physical resource block pair (PRB pair, RB pair).
[0028]
　　
　FIG. 5 is a schematic block diagram showing a configuration of the base station device 100 according to the present embodiment. As illustrated, the base station device 100 includes an upper layer processing unit 101, a control unit 103, a receiving unit 105, a transmitting unit 107, and a transmitting/receiving antenna 109. In addition, the receiving unit 105 includes a decoding unit 1051, a demodulation unit 1053, a demultiplexing unit 1055, a wireless reception unit 1057, and a channel measurement unit 1059. Further, the transmission unit 107 is configured to include an encoding unit 1071, a modulation unit 1073, a multiplexing unit 1075, a wireless transmission unit 1077, and a downlink reference signal generation unit 1079.
[0029]
　As described above, the base station device 100 can support one or more RATs. Some or all of the units included in the base station apparatus 100 shown in FIG. 5 can be individually configured according to the RAT. For example, the receiving unit 105 and the transmitting unit 107 are individually configured with LTE and NR. Further, in the NR cell, some or all of the units included in the base station apparatus 100 shown in FIG. 5 can be individually configured according to the parameter set related to the transmission signal. For example, in a certain NR cell, the wireless reception unit 1057 and the wireless transmission unit 1077 can be individually configured according to the parameter set regarding the transmission signal.
[0030]
　The upper layer processing unit 101 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing is performed. The upper layer processing unit 101 also generates control information for controlling the reception unit 105 and the transmission unit 107, and outputs the control information to the control unit 103.
[0031]
　The control unit 103 controls the reception unit 105 and the transmission unit 107 based on the control information from the upper layer processing unit 101. The control unit 103 generates control information for the upper layer processing unit 101 and outputs it to the upper layer processing unit 101. The control unit 103 inputs the decoded signal from the decoding unit 1051 and the channel estimation result from the channel measuring unit 1059. The control unit 103 outputs the signal to be encoded to the encoding unit 1071. The control unit 103 is also used to control the whole or a part of the base station device 100.
[0032]
　The upper layer processing unit 101 performs processing and management related to RAT control, radio resource control, subframe setting, scheduling control, and/or CSI report control. The processing and management in the upper layer processing unit 101 are performed for each terminal device 200 or commonly for the terminal devices 200 connected to the base station device 100. The processing and management in the upper layer processing unit 101 may be performed only by the upper layer processing unit 101, or may be acquired from the upper node or another base station device 100. Further, the processing and management in the upper layer processing unit 101 may be individually performed according to the RAT. For example, the upper layer processing unit 101 separately performs processing and management in LTE and processing and management in NR.
[0033]
　The RAT control in the upper layer processing unit 101 manages the RAT. For example, in the RAT control, management regarding LTE and/or management regarding NR are performed. Management regarding NR includes setting and processing of parameter sets regarding transmission signals in NR cells.
[0034]
　In radio resource control in the upper layer processing unit 101, downlink data (transport block), system information, RRC message (RRC parameter), and/or generation and/or management of a MAC control element (CE: Control Element) are performed. Done.
[0035]
　In the subframe setting in the higher layer processing unit 101, management of subframe setting, subframe pattern setting, uplink-downlink setting, uplink reference UL-DL setting, and/or downlink reference UL-DL setting is performed. Be seen. The subframe setting in upper layer processing section 101 is also referred to as base station subframe setting. Further, the subframe setting in the upper layer processing unit 101 can be determined based on the amount of uplink traffic and the amount of downlink traffic. Further, the subframe setting in upper layer processing section 101 can be determined based on the scheduling result of the scheduling control in upper layer processing section 101.
[0036]
　In the scheduling control in the upper layer processing unit 101, based on the received channel state information, the estimated value of the propagation path input from the channel measurement unit 1059, the quality of the channel, and the like, the frequency and subframe to which the physical channel is assigned, the physical channel The coding rate, modulation method, transmission power, etc. are determined. For example, the control unit 103 generates control information (DCI format) based on the scheduling result of the scheduling control in the upper layer processing unit 101.
[0037]
　In the CSI report control in the upper layer processing unit 101, the CSI report of the terminal device 200 is controlled. For example, the setting regarding the CSI reference resource to be assumed for calculating the CSI in the terminal device 200 is controlled.
[0038]
　Under the control of the control unit 103, the reception unit 105 receives the signal transmitted from the terminal device 200 via the transmission/reception antenna 109, further performs reception processing such as separation, demodulation, and decoding, and outputs the reception-processed information. It is output to the control unit 103. Note that the reception process in the reception unit 105 is performed based on the settings defined in advance or the settings notified by the base station device 100 to the terminal device 200.
[0039]
　The wireless reception unit 1057 converts an uplink signal received via the transmission/reception antenna 109 into an intermediate frequency (down conversion), removes unnecessary frequency components, and appropriately maintains the signal level. Control of amplification level, quadrature demodulation based on in-phase and quadrature components of received signal, conversion of analog signal to digital signal, removal of Guard Interval (GI), and/or Fast Fourier Transform Extract the frequency domain signal by Transform: FFT).
[0040]
　The demultiplexing unit 1055 separates an uplink channel and/or an uplink reference signal such as PUCCH (Physical Uplink Control Channel) or PUSCH (Physical Uplink shared Channel) from the signal input from the wireless reception unit 1057. The demultiplexing unit 1055 outputs the uplink reference signal to the channel measuring unit 1059. The demultiplexing unit 1055 compensates the propagation path for the uplink channel based on the propagation path estimated value input from the channel measurement unit 1059.
[0041]
　The demodulation unit 1053 uses a modulation method such as BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM for the modulation symbol of the uplink channel. Demodulate. The demodulation unit 1053 separates and demodulates the MIMO-multiplexed uplink channel.
[0042]
　The decoding unit 1051 performs a decoding process on the coded bits of the demodulated uplink channel. The decoded uplink data and/or the uplink control information is output to the control unit 103. Decoding section 1051 performs decoding processing on PUSCH for each transport block.
[0043]
　The channel measuring unit 1059 measures a channel estimation value and/or channel quality from the uplink reference signal input from the demultiplexing unit 1055, and outputs it to the demultiplexing unit 1055 and/or the control unit 103. For example, the channel measurement unit 1059 measures an estimated value of a channel for performing channel compensation for the PUCCH or PUSCH using UL-DMRS, and uses an SRS (Sounding Reference signal) to measure the quality of the uplink channel. taking measurement.
[0044]
　Under the control of the control unit 103, the transmission unit 107 performs transmission processing such as coding, modulation, and multiplexing on the downlink control information and downlink data input from the upper layer processing unit 101. For example, the transmission unit 107 generates and multiplexes PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signal to generate a transmission signal. Note that the transmission processing in the transmission unit 107 is based on the settings specified in advance, the settings notified by the base station apparatus 100 to the terminal apparatus 200, or the settings notified via the PDCCH or EPDCCH transmitted in the same subframe. Done.
[0045]
　The coding unit 1071 performs predetermined coding such as block coding, convolutional coding, and turbo coding on the HARQ indicator (HARQ-ACK), downlink control information, and downlink data input from the control unit 103. Encoding is performed using the method. The modulator 1073 modulates the coded bits input from the encoder 1071 by a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. The downlink reference signal generation unit 1079 generates a downlink reference signal based on a physical cell identifier (PCI) and RRC parameters set in the terminal device 200. The multiplexing unit 1075 multiplexes the modulation symbol of each channel and the downlink reference signal, and arranges them in a predetermined resource element.
[0046]
　The wireless transmission unit 1077 converts the signal from the multiplexing unit 1075 into a signal in the time domain by Inverse Fast Fourier Transform (IFFT), adds a guard interval, generates a baseband digital signal, Generates a transmission signal by performing processing such as conversion to analog signal, quadrature modulation, conversion of intermediate frequency signal to high frequency signal (up convert), removal of excess frequency component, power amplification, etc. .. The transmission signal output by the wireless transmission unit 1077 is transmitted from the transmission/reception antenna 109.
[0047]
　　
　FIG. 6 is a schematic block diagram showing the configuration of the terminal device 200 according to the present embodiment. As illustrated, the terminal device 200 includes an upper layer processing unit 201, a control unit 203, a receiving unit 205, a transmitting unit 207, and a transmitting/receiving antenna 209. Further, the reception unit 205 includes a decoding unit 2051, a demodulation unit 2053, a demultiplexing unit 2055, a wireless reception unit 2057, and a channel measurement unit 2059. The transmission unit 207 is configured to include an encoding unit 2071, a modulation unit 2073, a multiplexing unit 2075, a wireless transmission unit 2077, and an uplink reference signal generation unit 2079.
[0048]
　As described above, the terminal device 200 can support one or more RATs. Some or all of the units included in the terminal device 200 illustrated in FIG. 6 may be individually configured according to the RAT. For example, the reception unit 205 and the transmission unit 207 are individually configured for LTE and NR. Further, in the NR cell, some or all of the units included in the terminal device 200 shown in FIG. 6 may be individually configured according to the parameter set regarding the transmission signal. For example, in a certain NR cell, the wireless reception unit 2057 and the wireless transmission unit 2077 can be individually configured according to the parameter set regarding the transmission signal.
[0049]
　The upper layer processing unit 201 outputs the uplink data (transport block) to the control unit 203. The upper layer processing unit 201 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing. The upper layer processing unit 201 also generates control information for controlling the reception unit 205 and the transmission unit 207, and outputs the control information to the control unit 203.
[0050]
　The control unit 203 controls the reception unit 205 and the transmission unit 207 based on the control information from the upper layer processing unit 201. The control unit 203 generates control information for the upper layer processing unit 201 and outputs it to the upper layer processing unit 201. The control unit 203 inputs the decoded signal from the decoding unit 2051 and the channel estimation result from the channel measuring unit 2059. The control unit 203 outputs the signal to be encoded to the encoding unit 2071. Further, the control unit 203 may be used to control the whole or a part of the terminal device 200.
[0051]
　The upper layer processing unit 201 performs processing and management related to RAT control, radio resource control, subframe setting, scheduling control, and/or CSI report control. The processing and management in the upper layer processing unit 201 are performed based on the settings defined in advance and/or the settings based on the control information set or notified from the base station apparatus 100. For example, the control information from the base station device 100 includes an RRC parameter, a MAC control element or DCI. Further, the processing and management in the upper layer processing unit 201 may be individually performed according to the RAT. For example, the upper layer processing unit 201 separately performs processing and management in LTE and processing and management in NR.
[0052]
　The RAT control in the upper layer processing unit 201 manages the RAT. For example, in the RAT control, management regarding LTE and/or management regarding NR are performed. Management regarding NR includes setting and processing of parameter sets regarding transmission signals in NR cells.
[0053]
　In the radio resource control in the upper layer processing unit 201, the setting information in the own device is managed. In radio resource control in the upper layer processing unit 201, generation and/or management of uplink data (transport block), system information, RRC message (RRC parameter), and/or MAC control element (CE: Control Element) is performed. Done.
[0054]
　In the subframe setting in upper layer processing section 201, subframe setting in base station apparatus 100 and/or base station apparatus 100 different from base station apparatus 100 is managed. The subframe settings include uplink or downlink settings for subframes, subframe pattern settings, uplink-downlink settings, uplink reference UL-DL settings, and/or downlink reference UL-DL settings. The subframe setting in upper layer processing section 201 is also referred to as terminal subframe setting.
[0055]
　In the scheduling control in upper layer processing section 201, control information for performing scheduling-related control for receiving section 205 and transmitting section 207 is generated based on DCI (scheduling information) from base station apparatus 100.
[0056]
　In CSI report control in upper layer processing section 201, control relating to CSI reporting to base station apparatus 100 is performed. For example, in the CSI report control, the setting related to the CSI reference resource to be assumed for calculating the CSI in the channel measurement unit 2059 is controlled. In CSI report control, resources (timing) used for reporting CSI are controlled based on DCI and/or RRC parameters.
[0057]
　Under the control of the control unit 203, the reception unit 205 receives the signal transmitted from the base station device 100 via the transmission/reception antenna 209, further performs reception processing such as separation, demodulation, and decoding, and the reception processed information. Is output to the control unit 203. Note that the reception process in the reception unit 205 is performed based on a preset setting or a notification or setting from the base station device 100.
[0058]
　The wireless reception unit 2057 converts an uplink signal received via the transmission/reception antenna 209 into an intermediate frequency (down conversion), removes unnecessary frequency components, and appropriately maintains the signal level. Control of amplification level, quadrature demodulation based on in-phase and quadrature components of received signal, conversion of analog signal to digital signal, removal of Guard Interval (GI), and/or Fast Fourier Transform The signal in the frequency domain is extracted by Transform: FFT.
[0059]
　The demultiplexing unit 2055 separates a downlink channel such as PHICH, PDCCH, EPDCCH, or PDSCH, a downlink synchronization signal, and/or a downlink reference signal from the signal input from the radio reception unit 2057. The demultiplexing unit 2055 outputs the downlink reference signal to the channel measuring unit 2059. The demultiplexing unit 2055 compensates the propagation path for the downlink channel from the estimated value of the propagation path input from the channel measuring unit 2059.
[0060]
　The demodulation unit 2053 demodulates the received signal to the downlink channel modulation symbol using a modulation scheme such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. The demodulation unit 2053 separates and demodulates the MIMO-multiplexed downlink channel.
[0061]
　The decoding unit 2051 performs a decoding process on the coded bits of the demodulated downlink channel. The decoded downlink data and/or the downlink control information is output to the control unit 203. The decoding unit 2051 performs a decoding process on the PDSCH for each transport block.
[0062]
　The channel measuring unit 2059 measures the estimated value of the propagation path and/or the quality of the channel from the downlink reference signal input from the demultiplexing unit 2055, and outputs it to the demultiplexing unit 2055 and/or the control unit 203. The downlink reference signal used by the channel measurement unit 2059 for measurement may be determined based on at least the transmission mode set by the RRC parameter and/or another RRC parameter. For example, DL-DMRS measures an estimated value of a channel for performing channel compensation for PDSCH or EPDCCH. The CRS measures a channel estimation value for performing channel compensation for the PDCCH or PDSCH and/or a downlink channel for reporting CSI. CSI-RS measures a channel in the downlink for reporting CSI. The channel measurement unit 2059 calculates RSRP (Reference Signal Received Power) and/or RSRQ (Reference Signal Received Quality) based on the CRS, CSI-RS, or detection signal, and outputs the RSRP (Reference Signal Received Quality) to the upper layer processing unit 201.
[0063]
　Under the control of the control unit 203, the transmission unit 207 performs transmission processing such as coding, modulation, and multiplexing on the uplink control information and the uplink data input from the upper layer processing unit 201. For example, the transmission unit 207 generates and multiplexes an uplink channel and/or an uplink reference signal such as PUSCH or PUCCH to generate a transmission signal. In addition, the transmission process in the transmission unit 207 is performed based on a preset setting or a setting or a notification from the base station apparatus 100.
[0064]
　The encoding unit 2071 encodes the HARQ indicator (HARQ-ACK), the uplink control information, and the uplink data input from the control unit 203 into predetermined encoding such as block encoding, convolutional encoding, and turbo encoding. Encoding is performed using the method. The modulator 2073 modulates the coded bits input from the encoder 2071 by a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. The uplink reference signal generation unit 2079 generates an uplink reference signal based on the RRC parameter set in the terminal device 200 and the like. The multiplexing unit 2075 multiplexes the modulation symbol of each channel and the uplink reference signal, and arranges them in a predetermined resource element.
[0065]
　The wireless transmission unit 2077 converts the signal from the multiplexing unit 2075 into a signal in the time domain by Inverse Fast Fourier Transform (IFFT), adds a guard interval, generates a baseband digital signal, Generates a transmission signal by performing processing such as conversion to analog signal, quadrature modulation, conversion of intermediate frequency signal to high frequency signal (up convert), removal of excess frequency component, power amplification, etc. .. The transmission signal output by the wireless transmission unit 2077 is transmitted from the transmission/reception antenna 209.
[0066]
　　 The
　base station apparatus 100 and the terminal apparatus 200 can use various methods for signaling (notifying, notifying, and setting) control information, respectively. Signaling of control information can be performed in various layers. The control information signaling includes physical layer signaling that is signaling through a physical layer, RRC signaling that is signaling through the RRC layer, and MAC signaling that is signaling through the MAC layer. The RRC signaling is dedicated RRC signaling (Dedicated RRC signaling) that notifies the terminal device 200 of the unique control information, or common RRC signaling (Common RRC signaling) that notifies the base station device 100 of the unique control information. .. Signaling used by higher layers from the physical layer, such as RRC signaling and MAC signaling, is also called upper layer signaling.
[0067]
　RRC signaling is realized by signaling RRC parameters. MAC signaling is realized by signaling a MAC control element. The physical layer signaling is realized by signaling downlink control information (DCI: Downlink Control Information) or uplink control information (UCI: Uplink Control Information). The RRC parameters and MAC control elements are transmitted using PDSCH or PUSCH. DCI is transmitted using PDCCH or EPDCCH. UCI is transmitted using PUCCH or PUSCH. RRC signaling and MAC signaling are used to signal semi-static control information, and are also called semi-static signaling. Physical layer signaling is used to signal dynamic control information, and is also called dynamic signaling. The DCI is used for PDSCH scheduling or PUSCH scheduling. The UCI is used for CSI reporting, HARQ-ACK reporting, and/or scheduling request (SR).
[0068]
　　
　Initial connection is a state in which the terminal device 200 has established a connection with any cell from a state in which it is not connected to any cell (idle state) (connection state). This is the process of transitioning to.
[0069]
　FIG. 7 is a flowchart showing an example of an initial connection procedure of the terminal device 200 according to this embodiment. As shown in FIG. 7, the terminal device 200 in the idle state performs a cell selection procedure (step S110). The cell selection procedure includes the steps of detecting a synchronization signal (step S111) and decoding PBCH (step S112). The terminal device 200 performs downlink synchronization with the cell based on the detection of the synchronization signal. Then, after the downlink synchronization is established, the terminal device 200 attempts to decode the PBCH and acquires the first system information.
[0070]
　Next, the terminal device 200 acquires the second system information based on the first system information included in the PBCH (step S120).
[0071]
　Next, the terminal device 200 performs a random access procedure (random access procedure, RACH procedure, RACH procedure) based on the first system information and/or the second system information (step S130). The random access procedure includes transmission of a random access preamble (step S131), reception of a random access response (step S132), transmission of Message 3 (step S133), and reception of contention resolution (step S133). The step of S134) is included. The terminal device 200 first selects a predetermined PRACH preamble and transmits it. Next, the terminal device 200 receives the PDSCH including the random access response corresponding to the transmitted PRACH preamble. Next, the terminal device 200 transmits the PUSCH including the message 3 by using the resource scheduled by the random access response grant included in the received random access response. Finally, the terminal device 200 receives the PDSCH including the collision resolution corresponding to the PUSCH.
[0072]
　Message 3 includes the RRC message of the RRC connection request. Conflict resolution includes RRC messages for RRC connection setup. When the terminal device 200 receives the RRC message of the RRC connection setup, the terminal device 200 performs the RRC connection operation and transitions from the RRC idle state to the RRC connection state. After transitioning to the RRC connection state, the terminal device 200 transmits an RRC message of RRC connection setup completion to the base station device 100. Through this series of operations, the terminal device 200 can be connected to the base station device 100.
[0073]
　Note that the random access preamble is also referred to as a message 1, the random access response is a message 2, the conflict resolution is a message 4, and the RRC connection setup completion message is also referred to as a message 5.
[0074]
　After all the steps of the random access procedure are completed, the terminal device 200 can transit to the state connected to the cell (connection state).
[0075]
　The random access procedure shown in FIG. 7 is also called a 4-step RACH procedure. On the other hand, the random access procedure in which the terminal device 200 also transmits the Message 3 along with the transmission of the random access preamble and the base station device 100 transmits the random access response and the contention resolution as their response is a two-step RACH procedure. Is called.
[0076]
　The random access preamble is transmitted in association with the PRACH. The random access response is transmitted on PDSCH. The PDSCH containing the random access response is scheduled on the PDCCH. Message 3 is transmitted on PUSCH. The PUSCH including the message 3 is scheduled by the uplink grant included in the random access response.
[0077]
　　 The
　system information is information for notifying the setting in the cell that transmits the system information. The system information includes, for example, information regarding access to the cell, information regarding cell selection, information regarding other RATs and other systems, and the like.
[0078]
　The system information can be classified into MIB (master information block) and SIB (system information block). The MIB is information of a fixed payload size broadcast by the PBCH. The MIB includes information for acquiring the SIB. SIB is system information other than MIB. The SIB is broadcast by PDSCH.
[0079]
　Further, the system information can be classified into first system information, second system information and third system information. The first system information and the second system information include information regarding access to the cell, information regarding acquisition of other system information, and information regarding cell selection. In LTE, the information contained in MIB can be regarded as the first system information, and the information contained in SIB1 and SIB2 can be regarded as the second system information. When the terminal device cannot acquire all the first system information and the second system information from the cell, it is assumed that access to the cell is prohibited.
[0080]
　The MIB is physical layer information necessary for receiving system information, and includes downlink system bandwidth, a part of system frame number, SIB scheduling information, and the like.
[0081]
　The SIB1 is cell access restriction information and scheduling information of system information other than SIB1, and includes cell access information, cell selection information, maximum uplink transmission power information, TDD setting information, system information period, and system information mapping information. , SI window length, etc. are included.
[0082]
　The SIB2 includes connection prohibition information, common radio resource configuration information (radioResourceConfigCommon), uplink carrier information, and the like. The cell-common radio resource configuration information includes cell-common PRACH and RACH configuration information. At the time of initial access, the terminal device 200 performs a random access procedure based on the PRACH and RACH setting information.
[0083]
　　 Also in
　NR, system information is broadcast from the NR cell.
[0084]
　Physical channels carrying system information may be transmitted in slots or minislots. A minislot is defined by the number of symbols that is smaller than the number of symbols in the slot. By transmitting the physical channel carrying the system information in the minislot, the time required for the beam sweep can be shortened and the overhead can be reduced.
[0085]
　The first system information is sent on the NR-PBCH and the second system information is sent on a different physical channel than the NR-PBCH.
[0086]
　　 The
　RACH procedure is used for RRC connection setup from idle state to inactive state or connected state, request for state transition from inactive state to connected state, handover for switching connected cell, and uplink data. Purposes such as scheduling request for resource request for transmission, timing advance adjustment for adjusting uplink synchronization, on-demand SI request for requesting system information that is not transmitted, restoration of broken beam connection (beam recovery), etc. Is done to achieve.
[0087]
　The RRC connection setup from the idle state to the inactive state or the connected state is an operation performed when the terminal device 200 connects to the base station device 100 according to the occurrence of traffic or the like. Specifically, it is an operation of passing information (for example, UE context) regarding the connection from the base station device 100 to the terminal device 200. The UE context is managed by predetermined terminal device identification information (for example, C-RNTI) instructed by the base station device 100. When this operation is completed, the terminal device 200 makes a state transition from the idle state to the inactive state or from the idle state to the connected state.
[0088]
　The request for the state transition from the inactive state to the connected state is an operation of requesting the state transition from the inactive state to the connected state in response to the occurrence of traffic. By transitioning to the connected state, the terminal device 200 can transmit/receive unicast data to/from the base station device 100.
[0089]
　The handover for switching the connected cell is an operation for switching the connection from the connected cell (serving) to the cell (neighbor cell) adjacent to the cell due to changes in the radio environment such as the movement of the terminal device 200. The terminal device 200 that has received the handover command from the base station device 100 makes a connection request to the neighbor cell designated by the handover command.
[0090]
　The scheduling request is an operation for making a resource request for uplink data transmission according to the occurrence of traffic. After receiving the scheduling request normally, the base station device 100 allocates the PUSCH resource to the terminal device 200. The scheduling request is also made by PUCCH.
[0091]
　The timing advance adjustment for adjusting the uplink synchronization is an operation for adjusting the error between the downlink and uplink frames caused by the propagation delay. The terminal device 200 transmits the PRACH at the timing adjusted to the downlink frame. By this means, the base station device 100 can recognize the propagation delay with the terminal device 200, and can instruct the terminal device 200 of the value of the timing advance with the message 2 or the like.
[0092]
　The on-demand SI request for requesting the system information that has not been transmitted transmits the system information to the base station apparatus 100 when the terminal apparatus 200 needs the system information that has not been transmitted for the purpose of overhead of the system information or the like. Is an operation that requires
[0093]
　The restoration (beam recovery) of the interrupted beam connection is an operation of making a restoration request when the communication quality is deteriorated due to the movement of the terminal device 200 after the establishment of the beam or the blocking of the communication path by another object. .. Receiving this request, the base station device 100 attempts connection with the terminal device 200 using different beams.
[0094]
　The RACH procedure further includes a collision-based RACH procedure and a non-collision RACH procedure.
[0095]
　The collision-based RACH procedure is a RACH procedure performed by the terminal device 200. The collision-based RACH procedure is a four-step procedure starting with the transmission of message 1 from the terminal device 200. The terminal device 200 selects from a plurality of preset RACH resources and a plurality of PRACH preambles, and transmits the PRACH. Since the plurality of RACH resources and the plurality of PRACH preambles are shared with another terminal device 200, the PRACH may collide.
[0096]
　FIG. 8 is a sequence diagram showing an example of the flow of the collision-based RACH procedure according to this embodiment. As shown in FIG. 8, first, the terminal device 200 transmits a random access preamble also called message 1 to the base station device 100 (step S202). Next, the base station device 100 transmits a random access response, also referred to as message 2, to the terminal device 200 (step S204). Next, the terminal device 200 transmits the RRC message of the RRC connection request, which is also called message 3, to the base station device 100 (step S206). Then, the base station device 100 transmits the collision resolution, which is also referred to as the message 4, to the terminal device 200 (step S208).
[0097]
　The non-collision RACH procedure is a RACH procedure performed under the initiative of the base station device 100. The non-collision RACH procedure is a three-step procedure starting from the transmission of the PDCCH order from the base station apparatus 100. The terminal device 200 transmits the random access preamble using the PRACH instructed in the PDCCH order. Since the base station apparatus 100 schedules the random access preamble, it is difficult for PRACH to collide.
[0098]
　FIG. 9 is a sequence diagram showing an example of the flow of the non-collision RACH procedure according to this embodiment. As shown in FIG. 9, first, the base station device 100 transmits a PDCCH order to the terminal device 200 (step S302). Next, the terminal device 200 transmits the random access preamble to the base station device 100 (step S304). Then, the base station device 100 transmits a random access response to the terminal device 200 (step S306).
[0099]
　　 The
　NR-PRACH is configured using a Zadoff-Chu sequence or an M sequence. In NR-PRACH, a plurality of preamble formats are specified. The preamble format is defined by a combination of parameters such as PRACH subcarrier interval, transmission bandwidth, sequence length, number of symbols used for transmission, number of transmission repetitions, CP length, and guard period length. Note that the preamble format may specify the type of sequence (Zaddoff-Chu sequence or M sequence) used for NR-PRACH transmission.
[0100]
　For the terminal device 200 in the idle mode, the NR-PRACH setting is made by the system information. Further, for the terminal device 200 in the connected mode, the setting regarding the NR-PRACH is set by the dedicated RRC signaling.
[0101]
　The NR-PRACH is transmitted by a physical resource (NR-PRACH occasion) capable of transmitting the NR-PRACH. The physical resource is dictated by the settings for NR-PRACH. The terminal device 200 selects any of the physical resources and transmits the NR-PRACH. Further, the terminal device 200 in the connected mode transmits the NR-PRACH by using the NR-PRACH resource. The NR-PRACH resource is a combination of the NR-PRACH preamble and its physical resource. The base station device 100 can instruct the terminal device 200 about the NR-PRACH resource.
[0102]
　The types of NR-PRACH preamble sequences are numbered. The number of the preamble sequence type is called a preamble index.
[0103]
　The NR-PRACH is retransmitted when the random access procedure fails. When retransmitting, the terminal device 200 waits for transmission of the NR-PRACH for a waiting period calculated from the backoff value (backoff indicator, BI). The backoff value may differ depending on the terminal category of the terminal device 200 and the priority of the generated traffic. At this time, a plurality of backoff values ​​are notified, and the terminal device 200 selects the backoff value to be used according to the priority. Further, when the NR-PRACH is retransmitted, the transmission power of the NR-PRACH is increased as compared with the initial transmission (this procedure is referred to as power ramping).
[0104]
　　 The NR random access response is transmitted by the NR-PDSCH.
[0105]
　The NR-PDSCH containing the random access response is scheduled by the NR-PDCCH whose CRC is scrambled by RA-RNTI. The NR-PDCCH is transmitted on the common control subband. The NR-PDCCH is arranged in CSS (common search space). The value of RA-RNTI is determined based on the transmission resource (time resource (slot or subframe) and frequency resource (resource block)) of NR-PRACH corresponding to the random access response. The NR-PDCCH may be placed in the search space associated with the NR-PRACH associated with the random access response. Specifically, the search space in which the NR-PDCCH is arranged is set in association with the preamble of the NR-PRACH and/or the physical resource in which the NR-PRACH is transmitted. The search space in which the NR-PDCCH is arranged is set in association with the preamble index and/or the index of the physical resource.
[0106]
　The NR-PDCCH is NR-SS and QCL.
[0107]
　The NR random access response is MAC information. The NR random access response includes at least the uplink grant for transmitting the NR message 3, the value of the timing advance used for adjusting the uplink frame synchronization, and the value of the temporary C-RNTI. .. Further, the NR random access response includes the PRACH index used for NR-PRACH transmission corresponding to the random access response. Further, the NR random access response includes information about backoff used for waiting for PRACH transmission. The base station device 100 transmits the NR-PDSCH including these pieces of information. The terminal device 200 determines whether or not the transmission of the random access preamble has succeeded based on these pieces of information. If it is determined from this information that the transmission of the random access preamble has failed, the terminal device 200 performs the transmission process of the NR message 3 according to the information included in the random access response. On the other hand, when determining that the transmission of the random access preamble has failed, the terminal device 200 considers that the random access procedure has failed, and performs the NR-PRACH retransmission process.
[0108]
　It should be noted that the NR random access response may include a plurality of uplink grants for transmitting the NR message 3. The terminal device 200 can select one resource for transmitting the message 3 from the plurality of uplink grants. By this means, it is possible to mitigate collision of NR message 3 transmission when different terminal devices 200 receive the same NR random access response, and to provide a more stable random access procedure.
[0109]
　　 The
　NR message 3 is transmitted by the NR-PUSCH. The NR-PUSCH is transmitted using the resources indicated by the random access response.
[0110]
　The NR message 3 includes an RRC connection request message.
[0111]
　The NR-PUSCH Waveform transmitted including the NR message 3 is indicated by the parameter included in the system information. Specifically, OFDM or DFT-s-OFDM is determined according to the instruction of the parameter.
[0112]
　When the base station apparatus 100 normally receives the NR message 3, the base station apparatus 100 proceeds to the collision resolution transmission process. On the other hand, when the base station apparatus 100 cannot normally receive the NR message 3, it can try to receive the NR message 3 again for at least a predetermined period.
[0113]
　As a specific example of the processing after the NR message 3 is not normally received, the base station device 100 instructs the terminal device 200 to retransmit the message 3. The base station apparatus 100 transmits an instruction to retransmit the message 3 using downlink resources after a predetermined number of slots (or subframes or radio frames) from the resource instructing the transmission of the message 3.
[0114]
　An example of the retransmission of the message 3 and the instruction of the transmission resource is an instruction by the retransmission of the random access response.
[0115]
　The NR-PDSCH containing the retransmitted random access response is scheduled by the NR-PDCCH whose CRC is scrambled by RA-RNTI. The RA-RNTI value is the same as the RA-RNTI value used in the initial transmission. That is, it is determined based on the transmission resource of NR-PRACH corresponding to the random access response. Alternatively, the value of RA-RNTI may be determined based on the information for identifying initial transmission and retransmission in addition to the transmission resource of NR-PRACH. The NR-PDCCH is arranged in CSS (common search space).
[0116]
　Or, the NR-PDSCH including the retransmitted random access response is scheduled by the NR-PDCCH whose CRC is scrambled by the temporary C-RNTI or C-RNTI included in the random access response transmitted in the initial transmission. ..
[0117]
　Another example of the instruction to retransmit the message 3 and the transmission resource is an instruction by the NR-PDCCH used for the instruction to retransmit the message 3. The NR-PDCCH is an uplink grant. The DCI of the NR-PDCCH indicates a resource for retransmitting the message 3. The terminal device 200 retransmits the message 3 based on the instruction of the uplink grant.
[0118]
　As a specific example of the processing after the NR message 3 is not successfully received, the base station device 100 attempts to receive the message 3 using the retransmission resource designated in advance.
[0119]
　When collision resolution is not transmitted from the base station apparatus 100 after transmitting the message 3 within a predetermined period, the terminal device 200 transmits the NR-PUSCH including the message 3 by using the retransmission resource designated in advance. To do.
[0120]
　Alternatively, when the terminal device 200 receives the NACK for the message 3, the terminal device 200 transmits the NR-PUSCH including the message 3 by using the retransmission resource designated in advance corresponding to the NACK.
[0121]
　The resource for retransmission instructed in advance is included in the system information or the random access response, for example.
[0122]
　If the number of retransmissions of the NR message 3 exceeds a predetermined number, or if reception of the NR collision resolution is unsuccessful within a predetermined period, the terminal device 200 considers that the random access procedure has failed. , NR-PRACH retransmission processing is performed.
[0123]
　The transmission beam of the terminal device 200 used for retransmission of the NR message 3 may be different from the transmission beam of the terminal device 200 used for the initial transmission of the message 3.
[0124]
　If neither the NR collision resolution nor the message 3 retransmission instruction is received within the predetermined period, the terminal device 200 considers that the random access procedure has failed and performs the NR-PRACH retransmission process. .. The predetermined period is set by the system information, for example.
[0125]
　　
　NR collision resolution is sent by NR-PDSCH.
[0126]
　The NR-PDSCH with collision resolution is scheduled by the NR-PDCCH whose CRC is scrambled by the temporary C-RNTI or C-RNTI. The NR-PDCCH is transmitted on the common control subband. The NR-PDCCH is arranged in USS (terminal-specific search space). The NR-PDCCH may be placed in the CSS.
[0127]
　When the terminal device 200 normally receives the NR-PDSCH including the collision resolution, the terminal device 200 returns an ACK to the base station device 100. After that, it is considered that the random access procedure has succeeded, and the terminal device 200 enters the connected state. On the other hand, when NACK for the NR-PDSCH including the collision resolution is received from the terminal device 200 or there is no response, the base station device 100 retransmits the NR-PDSCH including the collision resolution. Further, when the NR collision resolution cannot be received within the predetermined period, the terminal device 200 considers that the random access procedure has failed and performs the NR-PRACH retransmission process.
[0128]
　　
　It is desirable that the base station apparatus 100 receives the uplink signals from the plurality of terminal apparatuses 200 at the same timing. For that purpose, the transmission timing of the uplink signal is adjusted in consideration of the difference in propagation delay caused by the difference in the distance to the base station apparatus 100. This point will be described with reference to FIG.
[0129]
　FIG. 10 is a diagram for explaining an example of uplink synchronization adjustment according to the present embodiment. In the example illustrated in FIG. 10, the terminal device 200A is located near the base station device 100 in the cell 90 provided by the base station device 100, and the terminal device 200B is located far from the base station device 100. It is assumed that these terminal devices 200 simultaneously perform uplink communication. When the terminal devices 200A and 200B transmit the uplink signal at the transmission timing based on the downlink synchronization timing, the respective uplink signals are transmitted to the base station due to different propagation delays and processing delays unique to the terminal device 200. It is received by the device 100 at different reception timings. If the reception timing of each uplink signal is different, inter-symbol interference may occur and the characteristics may deteriorate.
[0130]
　Therefore, the transmission timing of the uplink signal of the terminal device 200 is adjusted ahead of time so that the transmission timing of the downlink signal and the reception timing of the uplink signal of the base station device 100 are aligned.
[0131]
　FIG. 11 is a diagram for explaining an example of uplink synchronization adjustment according to the present embodiment. In FIG. 11, the downlink transmission timing of the base station device 100 is shown in the first stage from the top, and the downlink reception timing of the terminal device 200 is shown in the second stage from the top. Further, the uplink transmission timing of the terminal device 200 is shown in the third row from the top, and the uplink reception timing of the base station apparatus 100 is shown in the fourth row from the top. Each stage is composed of a plurality of rectangles, and one rectangle represents one radio frame. As shown in the first and second stages, the downlink signal from the base station device 100 is received by the terminal device 200 with a delay of a predetermined time due to the influence of the propagation delay and the processing delay of the terminal device 200. The terminal device 200 adjusts the uplink transmission timing using the timing advance value instructed by the base station device 100, with reference to the timing at which the downlink signal is received. Specifically, as shown in the third row, the terminal device 200 transmits the uplink physical signal ahead of the reception timing of the corresponding downlink signal by the timing advance value. By this means, as shown in the fourth row, the adjusted uplink signal of the terminal device 200 is received by the base station device 100 at the same timing as the downlink transmission timing.
[0132]
　The timing advance value is calculated as approximately twice the one-way delay time.
[0133]
　The timing advance value is unique to the terminal device 200. The timing advance value is uniquely notified to the terminal device 200.
[0134]
　PRACH is used for the calculation of the timing advance value. A random access response (RAR) is used to notify the timing advance value. Hereinafter, with reference to FIG. 12, an example of a procedure regarding the calculation of the timing advance value by the base station apparatus 100 and the application of the timing advance value by the terminal apparatus 200 will be described.
[0135]
　FIG. 12 is a sequence diagram showing an example of the flow of the uplink synchronization adjustment procedure according to this embodiment. As illustrated in FIG. 12, the base station device 100 transmits downlink synchronization signals (PSS (primary synchronization signal) and SSS (secondary synchronization signal)) to the terminal device 200 (step S402). Next, the terminal device 200 performs downlink synchronization based on the downlink synchronization signal transmitted from the base station device 100 (step S404). Next, the base station device 100 transmits system information (MIB and SIB) (step S406). Next, the terminal device 200 receives the system information and acquires the RACH setting from the received system information (step S408). Next, the terminal device 200 transmits the PRACH based on the frame timing synchronized by the downlink synchronization signal (step S410). The base station device 100 calculates the propagation delay and the timing advance value based on the difference between the reception timing of the PRACH and the timing of the uplink frame of the base station device 100 (step S412). Then, the base station device 100 includes the timing advance value in the random access response (RAR) and transmits it to the terminal device 200 (step S414). Next, the terminal device 200 acquires the timing advance value from the received RAR and adjusts the uplink transmission timing so as to move it forward (step S416). After that, the terminal device 200 transmits uplink physical channels/signals such as PUSCH, PUCCH, and SRS at the uplink transmission timing adjusted in step S416 (step S418).
[0136]
　　 In
　cellular mobile communication, a cell (macro cell, micro cell, femto cell, or small) from a base station device or a relay device (hereinafter referred to as a ground station device) installed on the ground Cell) and a wireless network. The wireless network provided by this ground station is called a terrestrial network. On the other hand, satellite station devices (satellite base station device, satellite relay station device, space station) that orbit the earth are required due to cost reduction of base station devices and provision of coverage to areas where radio waves from the base station devices are difficult to reach. The provision of a wireless network from a device other than the ground station device, such as a device floating in the air such as an aerial vehicle or a drone, is under consideration. A wireless network provided from other than the ground station device is called a non-terrestrial network.
[0137]
　Examples of non-ground station devices include satellite station devices and aviation station devices. The satellite station device is a device having a wireless communication function, which is configured as a device that floats outside the atmosphere, such as an artificial satellite. The satellite station device according to the present embodiment is a low orbit (LEO, Low Earth Orbiting) satellite, a medium orbit (MEO, Medium Earth Orbiting) satellite, a geostationary (GEO, Geostationary Earth Orbiting) satellite, or a high elliptical orbit (HEO, Highly Elliptical Orbiting) satellite or the like. The aviation station device is a device having a wireless communication function, which is configured as a device that floats in the atmosphere such as an aircraft or a balloon. The aviation station apparatus according to the present embodiment includes an unmanned aviation system (UAS, Unmanned Aircraft Systems), a connection unmanned aviation system (tethered UAS), a light unmanned aviation system (Lighter than Air UAS, LTA), and a heavy unmanned aviation system (Heavier than). Air UAS, HTA), or High Altitude UAS Platforms (HAPs).
[0138]
　FIG. 13 is a diagram showing an example of the non-terrestrial network according to the present embodiment. The system 1 shown in FIG. 13 includes a satellite station apparatus 10A configured as a geostationary satellite, satellite station apparatuses 10B to 10D configured as low earth orbit satellites, and an aviation station apparatus 20 configured as an unmanned aerial system, which is non-ground. Wave network. The satellite station device 10 and the aviation station device 20 are connected via a relay station 30 to devices provided on the ground. For example, the satellite station device 10 and the aviation station device 20 are connected to the core network 31 via the relay station 30A, and are connected to the Internet 32 ​​and the terrestrial network 33 via the core network 31. Further, the satellite station devices 10A and 10B are connected to the femtocell base station 40A that provides a femtocell via the relay station 30B. The relay station 30 is also called an earth station (Very Small Aperture Terminal: VSAT), and may also be called a control earth station or a HUB station. The satellite station device 10 and the aviation station device 20 may be directly connected to a device provided on the ground, not via the VSAT 30. For example, the satellite station device 10B and the aviation station device 20 are directly connected to the macrocell base station 40B.
[0139]
　The satellite station device 10 and the aviation station device 20 communicate with a terminal device (also referred to as an earth terminal device) 40 that supports a non-terrestrial network. The earth terminal device 40 is a mobile phone, a smartphone, a car, a bus, a train, an aircraft, an M2M (Machine to Machine) device, an IoT (Internet of Things) device, a relay station that relays satellite communication, or a base station that transmits and receives satellite communication. Including equipment. In the example shown in FIG. 13, the macrocell base station 40B and the UE 40C correspond to the earth terminal device 40. The femtocell base station 40A connected to the non-terrestrial network via the relay by the VSAT 30B and the UE 40D connected to the non-terrestrial network via the relay by the UE 40C are also regarded as the earth terminal device 40 corresponding to the non-terrestrial network. May be.
[0140]
　The satellite station device 10 and the aviation station device 20 can transmit and receive uplink traffic and downlink traffic to and from the earth terminal device 40. For example, the satellite station devices 10A and 10B and the aviation station device 20 transmit and receive uplink traffic and downlink traffic to and from the UE 40C.
[0141]
　The satellite station device 10 and the aviation station device 20 can transmit and receive backhaul traffic (in other words, backhaul signal) to and from the earth terminal device 40. For example, the satellite station devices 10A and 10B transmit/receive backhaul traffic for communication performed between the femtocell base station 40A and the UE 40C to/from the femtocell base station 40A via the VSAT 30B. Further, the satellite station device 10B and the aviation station device 20 directly transmit/receive backhaul traffic for communication performed between the macrocell base station 40B and the UE 40C to/from the macrocell base station 40B.
[0142]
　　 The satellite communication according to the present embodiment refers to communication between the satellite station device 10 and the earth terminal device 40.
[0143]
　The satellite station apparatus 10 is mainly divided into a geostationary satellite station apparatus composed of geostationary satellites and a low earth orbit satellite station apparatus composed of low orbit satellites. The geostationary satellite station device is located at an altitude of about 35786 km, and revolves around the earth at the same speed as the rotation speed of the earth. The geostationary satellite station device is a satellite station device that has a relative velocity with the earth terminal device 40 of almost 0 and is observed from the earth terminal device 40 as if it were stationary. The low earth orbit satellite station device is generally located between an altitude of 500 km and 2000 km, and revolves the earth at a lower altitude than the geostationary satellite station device. Unlike the geostationary satellite station apparatus, the low-orbit satellite station apparatus has a relative speed with respect to the earth terminal apparatus 40 and is observed from the earth terminal apparatus 40 as if it were moving.
[0144]
　The satellite station device 10 can provide a cell having a size corresponding to the altitude. This point will be described with reference to FIG.
[0145]
　FIG. 14 is a diagram for explaining an example of cells provided by the satellite station device 10 according to the present embodiment. The satellite station device 10A shown in FIG. 14 is a geostationary satellite station device, and the satellite station devices 10B and 10C are low-orbit satellite station devices. As shown in FIG. 14, the low earth orbit satellite station devices 10B and 10C provide cells 90B and 10C larger than the cell 90D provided by the terrestrial macrocell base station 40B. Further, the geostationary satellite station device 10A provides a cell 90A larger than the cells 90B and 10C provided by the low-orbit satellite station devices 10B and 10C.
[0146]
　The larger the cell, the larger the difference in the distance to the satellite station device 10 between the plurality of earth terminal devices 40 located in the cell, and the larger the difference in propagation delay as a result. Further, the higher the altitude, the longer the distance between the satellite station device 10 and the earth terminal device 40, and thus the larger the propagation delay.
[0147]
　FIG. 15 is a diagram for explaining an example of cells provided by the low earth orbit satellite station device according to the present embodiment. As shown in FIG. 15, the low earth orbit satellite station devices 10B, 10C, and 10D revolve around the low earth orbit. These low earth orbit satellite station devices 10 establish a predetermined directivity toward the ground and provide satellite communication to the earth terminal device 40. In the example shown in FIG. 15, the low earth orbit satellite station device 10 transmits and receives a signal with a beam width angle of 40 degrees, and as a result, the cell 90 becomes a circle with a radius of 1000 km. The angle of the beam width refers to the direction in which the directional gain is ½ of the maximum directional gain, based on the direction in which the maximum directional gain is obtained (vertical line 91 in the example shown in FIG. 15). Defined as an angle. Note that these numerical values ​​are just examples. The low-orbit satellite station device 10 moves at a predetermined relative speed with respect to the ground. Therefore, the cell 90 provided by the low earth orbit satellite station device 10 moves on the ground at a predetermined speed. When it becomes difficult to provide satellite communication to the earth terminal device 40, satellite communication is provided from a subsequent low-orbit satellite (neighbor satellite station).
[0148]
　Non-terrestrial networks are expected to meet the following requirements.
　-Service extension to terminal devices (mainly IoT/MTC devices and public safety/critical communication) located in areas that cannot be covered by terrestrial networks-
　Service reliability to reduce service vulnerability to physical attacks or natural disasters sex and resettable
　service connection and provision to aviation terminal device such as, airplanes, passenger or drone
　service connection and providing to the mobile terminal device, such as, ship or train
　· a / V (audio / visual ) content, the group communication High-efficiency multicast/broadcast services such as IoT, IoT broadcast service, software download, and emergency message
　・Traffic offload between terrestrial and non-terrestrial networks
[0149]
　In order to satisfy these requirements, it is desirable that the non-terrestrial network realizes operational integration in the upper layer and commonality of radio interfaces with radio access technologies such as NR or LTE.
[0150]
　<<2. Technical Issues>> In
　order to achieve high throughput, adaptive control according to the communication environment is effective. For example, in normal LTE and NR applied to communication between a terrestrial base station device and a terminal device, adaptive control based on dense feedback is performed. For example, in normal LTE, the round trip time of CSI feedback is about 5 ms at maximum. Further, with NR, it is possible to shorten the round trip time of CSI feedback. Therefore, it is possible to realize adaptive control according to the channel status while updating the channel status finely. In addition, in normal LTE and NR, the round trip time from uplink grant to uplink transmission is short at a maximum of about 4 ms, so the communication environment at the time of uplink transmission compared from the time when transmission parameters for uplink transmission are determined. Change is small. By appropriately instructing the transmission parameters to the terminal device, fine adaptive control can be realized.
[0151]
　On the other hand, in satellite communication, adaptive control by fine feedback is difficult. The reasons are firstly that the communication environment changes at high speed, and secondly that the propagation delay is large.
[0152]
　First, the first reason will be described. Even with the same satellite station device revolving in the same orbit, the distance between the satellite station device and the terminal device on the ground changes by up to 600 km. Since the propagation delay changes by a maximum of 2.3 ms due to the change in the distance, there is a great influence on the synchronization concerning the transmission from the terrestrial terminal device to the satellite station device. Also, since the path loss changes greatly due to the change in the distance, the transmission power and the communication rate are greatly affected. Furthermore, the higher the relative speed between the satellite station device and the terrestrial terminal device, the faster the change in the communication environment described above occurs. For example, the low earth orbit satellite station device is moving at a speed of 7.6 km per second, and the above-mentioned change in the communication environment occurs at high speed.
[0153]
　Next, the second reason will be described. Since the satellite station device revolves in a high orbit, the distance to the terminal device on the ground is long and the propagation delay is large. Therefore, the round trip delay is also very large. For example, even if the terminal device on the ground measures CSI and feeds it back to the satellite station device, the communication environment has changed by the time the satellite station device communicates based on the measurement result. That is, the CSI measurement result cannot be said to be meaningful information. As another example, the transmission parameter of the uplink transmission is determined based on the uplink reference signal transmitted from the terminal device and is instructed to the terminal device, but in the case of satellite communication, the transmission parameter is caused by the propagation delay. A large round trip delay occurs after the determination of the above until the terminal device starts uplink transmission. Therefore, it cannot be said that the parameters determined when determining the transmission parameters for uplink transmission are appropriate parameters for uplink transmission of the terminal device.
[0154]
　Therefore, the present disclosure provides an adaptive control mechanism for satellite communication.
[0155]
　<<3. Functional Configuration Example>> An example of the functional configuration of the
　satellite station device 10 and the earth terminal device 40 according to the present embodiment will be described below with reference to FIGS. 16 and 17.
[0156]
　(1) Functional Configuration of Satellite Station Device 10
　FIG. 16 is a diagram for explaining an example of the functional configuration of the satellite station device 10 according to the present embodiment. As shown in FIG. 16, the satellite station device 10 according to this embodiment includes an acquisition unit 11, a setting unit 12, and a message transmission/reception unit 13. Note that each component shown in FIG. 16 can be implemented in any component such as the upper layer processing unit 101 or the control unit 103 shown in FIG. That is, in this embodiment, the base station apparatus 100 shown in FIG. 5 is configured as the satellite station apparatus 10.
[0157]
　Acquisition unit 11 The
　acquisition unit 11 has a function of acquiring information for determining (in other words, calculating) transmission parameters used when the earth terminal device 40 transmits a channel or a signal to the satellite station device 10. Have.
[0158]
　The acquisition unit 11 can acquire position information of the satellite station device 10 and orbit information described below. For example, the acquisition unit 11 is based on absolute position information of a plurality of ground-based locations or points (for example, VSAT 30) and a relative positional relationship between the ground-based locations or points. Then, the position information of the satellite station device 10 may be acquired. Further, the acquisition unit 11 may acquire the position information of the satellite station device 10 based on the relative positional relationship with another geostationary satellite and the orbit information of the other geostationary satellite. The orbit information is preset or stored in the satellite station device 10.
[0159]
　The acquisition unit 11 may acquire the channel quality related to the communication between the satellite station device 10 and the earth terminal device 40. For example, the satellite station device 10 measures the channel quality based on the measurement signal transmitted from the earth terminal device 40 to the satellite station device 10. The measurement signal may be, for example, SRS.
[0160]
　The acquisition unit 11 can acquire the position information of the earth terminal device 40. For example, the acquisition unit 11 may receive the position information of the earth terminal device 40 from the earth terminal device 40. Further, the acquisition unit 11 may acquire the position information of the earth terminal device 40 based on the transmission beam or the reception beam that captures the earth terminal device 40, which is identified when performing the beam tracking of the earth terminal device 40.
[0161]
　Setting unit 12 The
　setting unit 12 has a function of generating setting information regarding transmission parameters used for transmitting a channel/signal from the earth terminal device 40 to the satellite station device 10 based on the information acquired by the acquisition unit 11. Have. When the satellite station device 10 is the transmission parameter determination body, the setting unit 12 determines (in other words, calculates) the transmission parameter and generates setting information including the determined transmission parameter. On the other hand, when the earth terminal device 40 is the deciding body of the transmission parameter, the setting unit 12 generates the setting information including the information for the earth terminal device 40 to decide the transmission parameter. The setting unit 12 transmits the generated setting information to the earth terminal device 40.
[0162]
　-Message transmitting/receiving unit 13 The
　message transmitting/receiving unit 13 has a function of transmitting/receiving a message to/from the earth terminal device 40 based on the setting by the setting unit 12. Specifically, the message transmitting/receiving unit 13 receives the channel/signal transmitted by the earth terminal device 40 using the transmission parameter based on the setting information. At that time, the message transmitting/receiving unit 13 receives using the reception parameter corresponding to the transmission parameter used in the earth terminal device 40. For example, the message transmitting/receiving unit 13 performs a receiving process according to the modulation scheme and the coding rate used by the earth terminal device 40.
[0163]
　(2) Functional Configuration of Earth Terminal Device 40
　FIG. 17 is a diagram for explaining an example of the functional configuration of the earth terminal device 40 according to the present embodiment. As shown in FIG. 17, the earth terminal device 40 according to the present embodiment includes an acquisition unit 41, a setting unit 42, and a message transmission/reception unit 43. Note that each component shown in FIG. 17 can be implemented in any component such as the upper layer processing unit 201 or the control unit 203 shown in FIG. That is, in this embodiment, the terminal device 200 shown in FIG. 6 is configured as the earth terminal device 40.
[0164]
　-Acquisition unit 41 The
　acquisition unit 41 has a function of acquiring information for determining a transmission parameter, which is used when the earth terminal device 40 transmits a channel or a signal to the satellite station device 10.
[0165]
　The acquisition unit 41 acquires the setting information transmitted from the satellite station device 10 to the earth terminal device 40.
[0166]
　The acquisition unit 41 can acquire the position information of the earth terminal device 40. The acquisition unit 41 may acquire position information based on a GNSS signal received from a GNSS (Global Navigation Satellite System) satellite. Further, the acquisition unit 41 may acquire the position information based on the synchronization information received from the satellite station device 10. Further, the acquisition unit 41 may acquire the position information based on the positioning reference signal received from the satellite station device 10.
[0167]
　Setting unit 42 The
　setting unit 42 has a function of setting a transmission parameter used for transmitting a channel/signal from the earth terminal device 40 to the satellite station device 10 based on the information acquired by the acquisition unit 41. When the satellite station device 10 is the transmission parameter determination body, the setting unit 42 sets the transmission parameter determined by the satellite station device 10 included in the setting information. On the other hand, when the earth terminal device 40 is the transmission parameter determining entity, the setting unit 42 determines (in other words, calculates) the transmission parameter based on the setting information and sets it.
[0168]
　-Message sending/receiving unit 43 The
　message sending/receiving unit 43 has a function of sending/receiving a message to/from the satellite station device 10 based on the setting made by the setting unit 42. Specifically, the message transmission/reception unit 43 transmits a channel/signal to the satellite station device 10 using the set transmission parameter.
[0169]
　(3) Supplement
　Note that the channel/signal transmitted from the satellite station device 10 to the earth terminal device 40 may be a downlink signal (downlink physical channel or downlink physical signal) or backhaul traffic. May be. Similarly, the channel/signal transmitted from the earth terminal device 40 to the satellite station device 10 may be an uplink signal (uplink physical channel or uplink physical signal) or may be backhaul traffic. .. Below, for simplification of explanation, the channel/signal transmitted from the satellite station device 10 to the earth terminal device 40 is a downlink signal, and the channel/signal transmitted from the earth terminal device 40 to the satellite station device 10 is , An uplink signal.
[0170]
　<<4. Technical features>>
　<4.1. Control of Transmission Parameter> The
　satellite station device 10 revolves around a predetermined orbit. Therefore, the position of the satellite station device 10 can be predicted. Therefore, the satellite station device 10 or the earth terminal device 40 according to the present embodiment performs adaptive control (that is, adaptive determination) of the transmission parameter based on the prediction of the position of the satellite station device 10. Note that the control target is mainly transmission parameters for uplink transmission.
[0171]
　The satellite station device 10 or the earth terminal device 40 predicts the position of the satellite station device 10 based on the information about the satellite station device 10. The information on the satellite station device 10 includes the position information and the orbit information of the satellite station device 10. The orbit information includes at least information indicating the moving direction and moving speed of the satellite station device 10. Then, the prediction of the position of the satellite station device 10 is performed by adding the moving distance in the case of moving to the current position of the satellite station device 10 at the moving speed indicated by the orbit information up to the prediction target time in the moving direction indicated by the orbit information. It is done by matching.
[0172]
　Any time can be set as the prediction target time. For example, the prediction target time relating to the uplink transmission is the time at which the satellite station device 10 is predicted to receive the uplink signal transmitted by the earth terminal device 40. The time is shared between the earth terminal device 40 and the satellite station device 10 by downlink synchronization. Downlink synchronization is performed in the earth terminal device 40 by a synchronization signal (Synchronization Signal) or GNSS transmitted from the satellite station device 10.
[0173]
　The adaptive control of the transmission parameter is performed based on the prediction of the position of the satellite station device 10 described above. Specifically, the adaptive control of the transmission parameter is performed by predicting the position of the satellite station device 10 at the time when the uplink signal transmitted from the earth terminal device 40 to the satellite station device 10 is predicted to be received by the satellite station device 10. Based on. That is, the optimum transmission parameter for the position of the satellite station device 10, which is predicted to be located at the time when the satellite station device 10 is predicted to receive the uplink signal, is determined as the transmission parameter for transmitting the uplink signal. To be done. As a result, the earth terminal device 40 can transmit the uplink signal by using the optimum transmission parameter for the position of the satellite station device 10 at the time when the satellite station device 10 receives the uplink signal. Therefore, it is possible to improve the wireless link quality.
[0174]
　Adaptive control of transmission parameters may also be performed based on channel measurement results. Specifically, the satellite station device 10 first measures the channel quality based on the measurement signal transmitted from the earth terminal device 40 to the satellite station device 10. After that, the satellite station device 10 determines the channel quality at the position where the satellite station device 10 is predicted to exist at the time when the uplink signal transmitted by the earth terminal device 40 is predicted to be received by the satellite station device 10. Prediction is performed based on the measurement result of the channel quality measured in advance. Then, adaptive control of transmission parameters is performed based on the predicted channel quality. Since the transmission parameters are controlled based on the channel quality prediction result, it is possible to further improve the radio link quality.
[0175]
　The adaptive control of the transmission parameter may be further performed based on the position information of the earth terminal device 40. Specifically, the adaptive control of the transmission parameter is performed by determining the position of the satellite station device 10 and the position of the earth terminal device 40 at the time when the uplink signal transmitted by the earth terminal device 40 is predicted to be received by the satellite station device 10. It is performed based on the relative relationship of. That is, the optimum transmission parameter is determined for the relative positional relationship between the satellite station device 10 and the earth terminal device 40 at the time when the satellite station device 10 receives the uplink signal. As a result, the earth terminal device 40 uses the optimum transmission parameter for the relative positional relationship between the satellite station device 10 and the earth terminal device 40 at the time when the satellite station device 10 receives the uplink signal, and uses the uplink signal. Can be sent. Therefore, it is possible to further improve the wireless link quality.
[0176]
　As an example, orbit information of the low orbit satellite station device is shown in Table 1 below.
[0177]
[table 1]

[0178]
　In Table 1, the number of orbits, the number of satellite station devices, altitude, and angle are shown. The number of trajectories in Table 1 indicates the number of trajectories of the same altitude and angle. The number of satellite station devices in Table 1 indicates the number of satellite station devices 10 revolving at the same altitude and angle. The altitude in Table 1 is the orbital altitude. However, in the case of an elliptical orbit, the orbit information includes information indicating a change in altitude. Here, the satellite station device 10 revolves in orbit at a speed according to the altitude. That is, it can be said that the altitude included in the orbit information is information indicating the moving speed of the satellite station device 10. Of course, the orbit information may separately include the moving speed itself of the satellite station device 10 in addition to the altitude. The angles in Table 1 are the angles of the orbit with respect to latitude or longitude. That is, it can be said that the angle included in the orbit information is information indicating the moving direction of the satellite station device 10.
[0179]
　Various transmission parameters to be controlled can be considered. The transmission parameter to be controlled includes at least one of the following transmission parameters as an example.
[0180]
　For example, the controlled transmission parameter may include a timing advance value. Specifically, when the satellite station device 10 is predicted to move away from the earth terminal device 40, the timing advance value is updated to increase according to the distance predicted to move away. On the other hand, when the satellite station device 10 is predicted to approach the earth terminal device 40, the timing advance value is updated so as to decrease according to the distance predicted to approach. Thereby, the earth terminal device 40 can achieve the uplink synchronization.
[0181]
　For example, the controlled transmission parameters may include parameters related to beam tracking. Specifically, the direction of the beam used by the earth terminal device 40 is updated according to the predicted position of the earth terminal device 40. Accordingly, the earth terminal device 40 can transmit the uplink signal by using the transmission beam that captures the satellite station device 10 at the timing when the uplink signal is received by the satellite station device 10.
[0182]
　For example, the transmission parameter to be controlled may include the transmission power. Specifically, when the satellite station device 10 is predicted to move away from the earth terminal device 40, the transmission power is updated so as to increase according to the distance predicted to move away. On the other hand, when the satellite station device 10 is predicted to approach the earth terminal device 40, the transmission power is updated so as to decrease according to the distance predicted to approach. As a result, the earth terminal device 40 can transmit the uplink signal by using the transmission power that is just enough to achieve the predetermined reception power in the satellite station device 10.
[0183]
　For example, the transmission parameter to be controlled may include a modulation scheme and a coding rate. Specifically, when the satellite station device 10 is predicted to move away from the earth terminal device 40, MCS (Modulation and Coding Scheme) is updated so as to decrease according to the distance predicted to move away. That is, the modulation is updated so that the number of modulation levels decreases and/or the coding rate decreases. On the other hand, when the satellite station device 10 is predicted to approach the earth terminal device 40, the MCS is updated to increase according to the distance predicted to approach. That is, it is updated so that the modulation multi-level number increases and/or the coding rate increases. As a result, if it is predicted that the error rate in the transmission line will deteriorate, the MCS will be lowered to improve reliability, and if it is predicted that the error rate in the transmission line will be improved, the MCS will be increased. Adaptive control such that efficiency is improved becomes possible.
[0184]
　For example, the transmission parameter to be controlled may include the number of layers. The number of layers is, for example, the number of layers of MIMO (Multiple-Input and Multiple-Output). Specifically, when the satellite station device 10 is predicted to move away from the earth terminal device 40, the number of layers is updated so as to decrease according to the distance predicted to move away. On the other hand, when the satellite station device 10 is predicted to approach the earth terminal device 40, the number of layers is updated to increase according to the distance predicted to approach. As a result, it becomes possible to ensure the reception quality of the uplink signal in the satellite station device 10.
[0185]
　For example, the transmission parameter to be controlled may include the number of times the uplink signal is repeatedly transmitted. Specifically, when the satellite station device 10 is predicted to move away from the earth terminal device 40, the number of repeated transmissions is updated so as to increase according to the distance predicted to move away. On the other hand, when the satellite station device 10 is predicted to approach the earth terminal device 40, the number of repeated transmissions is updated so as to decrease according to the distance predicted to approach. In this way, the number of repeated transmissions is increased when it is predicted that the error rate on the transmission line will be poor, and the number of repeated transmissions is reduced when it is predicted that the error rate on the transmission line will be good. Therefore, the earth terminal device 40 can repeatedly transmit a sufficient number of times in order to achieve the predetermined reception characteristic of the satellite station device 10.
[0186]
　For example, the transmission parameter to be controlled may include a resource block used for transmitting an uplink signal. Specifically, when the satellite station device 10 is predicted to move away from the earth terminal device 40, the resource block is updated so as to increase according to the distance predicted to move away. On the other hand, when the satellite station device 10 is predicted to approach the earth terminal device 40, the resource block is updated so as to decrease according to the distance predicted to approach. In this way, when it is predicted that the error rate in the transmission line will deteriorate, the uplink signal will be transmitted in a wide frequency bandwidth, and in the case where the error rate in the transmission line will be improved, the uplink frequency band will increase in the narrow frequency band. The link signal is transmitted. Therefore, the earth terminal device 40 can transmit the uplink signal using the frequency resources having the sufficient bandwidths to achieve the predetermined reception characteristics in the satellite station device 10.
[0187]
　<4.2. Procedure>
　Hereinafter, a procedure for adaptive control of the transmission parameters described above will be described.
[0188]
　The satellite station device 10 transmits, to the earth terminal device 40, setting information regarding transmission parameters used for transmitting a signal from the earth terminal device 40 to the satellite station device 10, based on the information about the satellite station device 10. On the other hand, the earth terminal device 40 acquires the setting information transmitted by the satellite station device 10, and transmits a signal to the satellite station device 10 using the transmission parameter according to the acquired setting information. As described above, the transmission parameter is determined by predicting the position of the satellite station device 10 at the time when the uplink signal transmitted by the earth terminal device 40 is predicted to be received by the satellite station device 10. The setting information transmitted and received between the satellite station device 10 and the earth terminal device 40 is information for causing the earth terminal device 40 to use the transmission parameter based on the prediction of the position of the satellite station device 10. By transmitting and receiving such setting information, the earth terminal device 40 can transmit the uplink signal by using the transmission parameter optimum for the position of the satellite station device 10 at the reception timing of the uplink signal. .. Therefore, it is possible to improve the wireless link quality.
[0189]
　The transmission parameter control subject (that is, the determination subject) may be the satellite station device 10 or the earth terminal device 40. The setting information transmitted/received between the satellite station device 10 and the earth terminal device 40 may be different depending on which one controls the transmission parameter. Hereinafter, an example of a procedure for realizing adaptive control of transmission parameters will be described in order to explain variations of transmission parameter control subjects and setting information contents.
[0190]
　(1) First Procedure In
　the first procedure, the main body for determining the transmission parameter is the satellite station device 10. Hereinafter, the first procedure will be described in detail.
[0191]
　In the first procedure, the satellite station device 10 determines the transmission parameters used for the uplink transmission by the earth terminal device 40. That is, the setting information includes the transmission parameter. The satellite station device 10 generates setting information including transmission parameters and transmits the setting information to the earth terminal device 40. The earth terminal device 40 uses the transmission parameters included in the received setting information to perform uplink transmission to the satellite station device 10.
[0192]
　The transmission parameter determination method is as described above. That is, the satellite station device 10 predicts the position of the satellite station device 10 based on the position information and the orbit information of the satellite station device 10, and determines the transmission parameter based on the prediction result. Furthermore, the satellite station device 10 may determine the transmission parameter based on the channel measurement result. Further, the satellite station device 10 may determine the transmission parameter based on the position information of the earth terminal device 40. The satellite station device 10 generates setting information including the determined transmission parameter.
[0193]
　The transmission parameters to be controlled are also as described above.
[0194]
　The setting information is transmitted for each earth terminal device 40. Specifically, the setting information is generated and transmitted to the earth terminal device 40 each time the earth terminal device 40 performs uplink transmission. An uplink grant, for example, is used to transmit the setting information to the earth terminal device 40.
[0195]
　In the first procedure, since the earth terminal device 40 does not determine the transmission parameter, the processing load on the earth terminal device 40 is reduced.
[0196]
　The detailed processing flow of the first procedure will be described below with reference to FIG.
[0197]
　FIG. 18 is a sequence diagram showing an example of the flow of a first procedure for transmission parameter control executed in the system 1 according to this embodiment. As shown in FIG. 18, the satellite station device 10 and the earth terminal device 40 are involved in this sequence.
[0198]
　First, the satellite station device 10 determines a transmission parameter based on the position information and the orbit information of the satellite station device 10 (step S502). Specifically, the satellite station device 10 predicts the position of the satellite station device 10 at the reception timing of the uplink signal transmitted from the earth terminal device 40 in step S508 described later, and determines the transmission parameter to be used in step S508. To do. Next, the satellite station device 10 transmits the setting information including the generated transmission parameter to the earth terminal device 40 (step S504). Next, the earth terminal device 40 acquires the setting information including the transmission parameter (step S506). Next, the earth terminal device 40 transmits the uplink signal to the satellite station device 10 using the acquired transmission parameter (step S508).
[0199]
　After that, the satellite station device 10 again determines the transmission parameter based on the position information and the orbit information of the satellite station device 10 itself (step S510). Specifically, the satellite station device 10 predicts the position of the satellite station device 10 at the reception timing of the uplink signal transmitted from the earth terminal device 40 in step S514 described later, and generates the transmission parameter to be used in step S514. To do. Next, the satellite station device 10 transmits the setting information including the generated transmission parameter to the earth terminal device 40 (step S512). Next, the earth terminal device 40 acquires the setting information including the transmission parameter (step S514). Next, the earth terminal device 40 transmits the uplink signal to the satellite station device 10 using the acquired transmission parameter (step S516).
[0200]
　(2) Second Procedure In
　the second procedure, the satellite parameters are determined by the satellite station device 10, but the transmission parameters actually used for uplink transmission are selected by the earth terminal device 40. Hereinafter, the second procedure will be described in detail.
[0201]
　In the second procedure, the satellite station device 10 generates a transmission parameter update rule used for uplink transmission by the earth terminal device 40. That is, the setting information includes a transmission parameter update rule. The satellite station device 10 generates setting information including a transmission parameter update rule, and transmits the setting information to the earth terminal device 40. The earth terminal device 40 updates the transmission parameter based on the update rule of the transmission parameter included in the received setting information, and performs the uplink transmission to the satellite station device 10 using the updated transmission parameter.
[0202]
　· First example of update rules of transmission parameters
　as an example, updating rules of transmission parameters include a plurality of correspondence between transmission parameters to be used in the information and the transmission time indicating the transmission time. Here, the information indicating the transmission time is information indicating a subframe to be transmitted, information indicating a wireless frame to be transmitted (that is, SFN (System Frame Number)), or the like.
[0203]
　When performing the uplink transmission, the earth terminal device 40 selects the transmission parameter associated with the transmission time of the transmission target uplink signal in the transmission parameter update rule as the transmission parameter to be used. Then, the earth terminal device 40 transmits the uplink signal to be transmitted using the selected transmission parameter. That is, the earth terminal device 40 refers to the transmission parameter update rule for each transmission time, and performs uplink transmission while updating the transmission parameter.
[0204]
　The method of determining the transmission parameter included in the transmission parameter update rule is as described above. That is, the satellite station device 10 predicts the position of the satellite station device 10 based on the position information and the orbit information of the satellite station device 10, and determines the transmission parameter based on the prediction result. In particular, the satellite station device 10 determines the transmission parameter based on the prediction of the position of the satellite station device 10 for each of a plurality of transmission times in which the uplink transmission by the earth terminal device 40 can be performed. Furthermore, the satellite station device 10 may determine the transmission parameter based on the channel measurement result. Further, the satellite station device 10 may determine the transmission parameter based on the position information of the earth terminal device 40. The satellite station device 10 generates setting information including a plurality of associations of information indicating the transmission time and the transmission parameters determined for the transmission time.
[0205]
　The transmission parameters to be controlled are also as described above.
[0206]
　The setting information is transmitted for each earth terminal device 40. This is because the parameters to be used are different when the position is different for each earth terminal device 40, that is, when the relative position with respect to the satellite station device 10 is different. For transmitting the setting information to the earth terminal device 40, for example, a downlink control signal such as RRC signaling, RAR response grant, or PDCCH is used.
[0207]
　In this example, as compared with the first procedure, the number of times of transmitting and receiving the setting information is reduced, so that the communication load can be reduced.
[0208]
　Second Example of Update Rule of Transmission Parameter As
　another example, the update rule of the transmission parameter includes information indicating the transmission time and information indicating the transmission position, and the transmission time and the transmission parameter to be used at the transmission position. Includes multiple associations. Here, the information indicating the transmission position is latitude and longitude, or information indicating which one of a plurality of grid-shaped areas.
[0209]
　The earth terminal device 40 uses the transmission parameter associated with the transmission time of the transmission target uplink signal and the current position of the earth terminal device 40 in the transmission parameter update rule when performing the uplink transmission. To choose as. Then, the earth terminal device 40 transmits the uplink signal to be transmitted using the selected transmission parameter. That is, the earth terminal device 40 refers to the transmission parameter update rule for each transmission time and transmission location, and performs uplink transmission while updating the transmission parameter.
[0210]
　The method of determining the transmission parameter included in the transmission parameter update rule is as described above. Specifically, the satellite station device 10 determines the transmission parameters based on the prediction of the position of the satellite station device 10 at a plurality of positions where the earth terminal device 40 can be located and a plurality of positions where the earth terminal device 40 can perform uplink transmission. For each transmission time. Furthermore, the satellite station device 10 may determine the transmission parameter based on the channel measurement result. Further, the satellite station device 10 may determine the transmission parameter based on the position information of the earth terminal device 40. The satellite station device 10 generates setting information including a plurality of correspondences between the information indicating the transmission time and the information indicating the transmission position and the transmission parameters determined for the transmission time and the transmission position.
[0211]
　The transmission parameters to be controlled are also as described above.
[0212]
　The setting information is notified to the plurality of earth terminal devices 40. This is because the correspondence between the transmission time and the transmission parameter for each position is included in the setting information, so that a plurality of earth terminal devices 40 having different positions can commonly refer to the same setting information. A downlink control signal such as RRC signaling or PDCCH is used for transmitting the setting information to the earth terminal device 40.
[0213]
　In this example, as compared with the first procedure, the number of times the setting information is transmitted and received is reduced, so the communication load is reduced. Further, in this example, as compared with the first example, the plurality of earth terminal devices 40 can commonly use the same setting information, so that the satellite station device 10 is individually set in the earth terminal device 40. You don't have to send any information. Therefore, in this example, the communication load on the satellite station device 10 can be reduced as compared with the first example.
[0214]
　-Supplementary
　earth terminal device 40 may share the received setting information with other earth terminal devices 40 in the vicinity. The relative position between the earth terminal device 40 and the satellite station device 10 in the vicinity is almost the same as the relative position between the earth terminal device 40 and the satellite station device 10 that received the setting information, and the transmission parameters to be used are the same. It is because it is considered.
[0215]
　-Processing Flow
　Hereinafter, a detailed processing flow of the second procedure will be described with reference to FIG.
[0216]
　FIG. 19 is a sequence diagram showing an example of the flow of the second procedure for transmission parameter control executed in the system 1 according to this embodiment. As shown in FIG. 19, the satellite station device 10 and the earth terminal device 40 are involved in this sequence.
[0217]
　First, the satellite station device 10 generates a transmission parameter update rule based on the position information and the orbit information of the satellite station device 10 (step S602). The satellite station device 10 generates the transmission parameter update rule according to the above-described first example or second example. Next, the satellite station device 10 transmits the setting information including the generated transmission parameter update rule to the earth terminal device 40 (step S604). Next, the earth terminal device 40 acquires the setting information including the update rule of the transmission parameter (step S606).
[0218]
　Then, the earth terminal device 40 updates the transmission parameter based on the transmission parameter update rule (step S608). Specifically, regarding the first example of the transmission parameter update rule, the earth terminal device 40 selects, as the transmission parameter to be used, the transmission parameter associated with the transmission time of the uplink signal to be transmitted. Further, regarding the second example of the update rule of the transmission parameter, the earth terminal device 40 uses the transmission parameter associated with the transmission time of the uplink signal to be transmitted and the current position of the earth terminal device 40 for transmission. Select as a parameter. Next, the earth terminal device 40 transmits the uplink signal to the satellite station device 10 using the updated transmission parameter (step S610).
[0219]
　After that, the earth terminal device 40 continues to use the transmission parameter update rule acquired in step S606 to perform uplink transmission while updating the transmission parameter. That is, the earth terminal device 40 updates the transmission parameter based on the transmission parameter update rule (step S612), and transmits the uplink signal to the satellite station device 10 using the updated transmission parameter (step S614). Next, the earth terminal device 40 updates the transmission parameter based on the transmission parameter update rule (step S616), and transmits the uplink signal to the satellite station device 10 using the updated transmission parameter (step S618).
[0220]
　(3) Third Procedure In
　the third procedure, the terminating entity of the transmission parameter is the earth terminal device 40. Hereinafter, the third procedure will be described in detail.
[0221]
　In the third procedure, the satellite station device 10 transmits the position information and the orbit information of the satellite station device 10 to the earth terminal device 40. That is, the setting information includes the position information and the orbit information of the satellite station device 10. The earth terminal device 40 determines a transmission parameter based on the received position information and orbit information of the satellite station device 10, and performs uplink transmission to the satellite station device 10 using the determined transmission parameter.
[0222]
　The transmission parameter determination method is as described above. That is, the earth terminal device 40 predicts the position of the satellite station device 10 based on the position information and the orbit information of the satellite station device 10, and determines the transmission parameter based on the prediction result. Here, the orbit information is unchanged, and the earth terminal device 40 can update the position information of the satellite station device 10 based on the prediction. Therefore, the earth terminal device 40 updates the transmission parameter while predicting the position of the satellite station device 10 after acquiring the position information and the orbit information of the satellite station device 10 once without acquiring additional information. be able to. Further, the earth terminal device 40 may determine the transmission parameter based on the channel measurement result. Further, the earth terminal device 40 may determine the transmission parameter based on the position information of the earth terminal device 40.
[0223]
　The transmission parameters to be controlled are also as described above.
[0224]
　The earth terminal device 40 may report information indicating the determined transmission parameter to the satellite station device 10. As a result, the satellite station device 10 can know the transmission parameters used by the earth terminal device 40, and as a result, can properly receive the uplink signal. Information indicating the determined transmission parameters is reported using PUSCH or PUCCH. It is desirable that the transmission parameter of the physical uplink channel including the information indicating the determined transmission parameter is invariable with respect to the movement of the satellite station device 10. Among the above-mentioned examples of the transmission parameters to be controlled, it is desirable to report the transmission power, the modulation scheme and the coding rate, the number of layers, the number of repeated transmissions, and the resource block. This is for realizing appropriate reception of the uplink signal in the satellite station device 10. On the other hand, of the above-mentioned examples of the transmission parameters to be controlled, the parameters regarding the timing advance value and the beam tracking may not be reported. This is because the satellite station device 10 can appropriately receive the uplink signal even if it is not reported.
[0225]
　The setting information may be transmitted for each earth terminal device 40. In that case, the satellite station device 10 once transmits the setting information to the earth terminal device 40. For example, the satellite station device 10 individually transmits setting information to the earth terminal device 40 that has established initial access. A downlink control signal such as RRC signaling or PDCCH is used for transmitting the setting information to the earth terminal device 40.
[0226]
　The setting information may be notified to a plurality of earth terminal devices 40. In that case, the satellite station device 10 periodically reports the setting information to the plurality of earth terminal devices 40 in the cell. For example, the satellite station device 10 reports the setting information to the earth terminal device 40 before the initial access. The notified downlink control signal such as MIB or PBCH is used to notify the setting information to the plurality of earth terminal devices 40.
[0227]
　In the third procedure, after the earth terminal device 40 once acquires the position information and the orbit information of the satellite station device 10, the earth terminal device 40 transmits while predicting the position of the satellite station device 10 without acquiring additional information. Parameters can be updated. Therefore, in the third procedure, the number of times of transmitting and receiving the setting information is reduced as compared with the first procedure, so that the communication load can be reduced. Further, in the third procedure, since the transmission parameter determining entity is the earth terminal device 40, it is possible to reduce the processing load of the satellite station device 10 as compared with the first procedure and the second procedure.
[0228]
　The detailed processing flow of the third procedure will be described below with reference to FIG.
[0229]
　FIG. 20 is a sequence diagram showing an example of the flow of the third procedure for transmission parameter control executed in the system 1 according to this embodiment. As shown in FIG. 20, the satellite station device 10 and the earth terminal device 40 are involved in this sequence.
[0230]
　First, the satellite station device 10 generates setting information including the position information and orbit information of the satellite station device 10 and transmits the setting information to the earth terminal device 40 (step S702). Next, the earth terminal device 40 acquires the setting information including the position information and the orbit information of the satellite station device 10 (step S704).
[0231]
　Next, the earth terminal device 40 determines the transmission parameter based on the position information and the orbit information of the satellite station device 10 included in the setting information (step S706). Specifically, the earth terminal device 40 predicts the position of the satellite station device 10 at the reception timing of the uplink signal transmitted from the earth terminal device 40 in step S708 described later, and determines the transmission parameter to be used in step S708. decide. Then, the earth terminal device 40 transmits the uplink signal to the satellite station device 10 using the determined transmission parameter (step S708).
[0232]
　After that, the earth terminal device 40 continues to use the setting information acquired in step S704 to perform uplink transmission while updating the transmission parameter. That is, the earth terminal device 40 updates the transmission parameter based on the position information and the orbit information of the satellite station device 10 included in the setting information (step S710), and uses the updated transmission parameter to transmit the uplink signal to the satellite station. It transmits to the apparatus 10 (step S712).
[0233]
　<<5. Modifications>> In the
　above description, the base station device 100 is configured as the satellite station device 10 and the terminal device 200 is configured as the earth terminal device 40 corresponding to the non-terrestrial network, but the present technology is an example. Not limited to. For example, the base station device 100 may be configured as the earth terminal device 40. In that case, the earth terminal device 40 provides a wireless communication service to another earth terminal device (for example, a UE) and transmits/receives backhaul traffic to/from the satellite station device 10.
[0234]
　The adaptive control of the transmission parameters for the backhaul traffic transmitted from the earth terminal device 40 configured as the base station device 100 to the satellite station device 10 is similar to the above-described adaptive control of the transmission parameters for the uplink signal. Is done. Specifically, the adaptive control of the transmission parameter is performed based on the prediction of the position of the satellite station device 10. Specifically, the adaptive control of the transmission parameter is performed by predicting the position of the satellite station device 10 at the time when the backhaul traffic transmitted from the earth terminal device 40 to the satellite station device 10 is predicted to be received by the satellite station device 10. Based on. The setting information transmitted/received between the satellite station device 10 and the earth terminal device 40 is also the same as the setting information transmitted/received for adaptive control of the transmission parameter for the uplink signal.
[0235]
　The adaptive control of the reception parameter for the downlink signal transmitted from the satellite station device 10 to the earth terminal device 40 is performed in the same manner as a part of the adaptive control of the transmission parameter for the uplink signal described above. May be. Specifically, the adaptive control of the reception parameter is performed based on the prediction of the position of the satellite station device 10. Specifically, the adaptive control of the reception parameter is performed to predict the position of the satellite station device 10 at the time when it is predicted that the downlink signal transmitted from the satellite station device 10 to the earth terminal device 40 is transmitted by the satellite station device 10. It is done based on. The setting information transmitted/received between the satellite station device 10 and the earth terminal device 40 is also the same as the setting information transmitted/received for adaptive control of the transmission parameter for the uplink signal. The reception parameters to which the above-mentioned adaptive control can be applied to the reception of downlink signals also include reception beam tracking, MCS, the number of layers, the number of times downlink signals are repeatedly transmitted, and resource blocks.
[0236]
　<<6. Application Examples>>
　The technology according to the present disclosure can be applied to various products.
[0237]
　For example, the earth terminal device 40 may be implemented as an eNB (evolved Node B) of any type such as a macro eNB or a small eNB. A small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB or a home (femto) eNB. Alternatively, the earth terminal device 40 may be realized as another type of base station such as a NodeB or BTS (Base Transceiver Station). The earth terminal device 40 may include a main body (also referred to as a base station device) that controls wireless communication, and one or more RRHs (Remote Radio Heads) arranged in a place different from the main body. Further, various types of terminals described below may temporarily or semi-permanently execute the base station function to operate as the earth terminal device 40.
[0238]
　For example, the earth terminal device 40 is used as a mobile terminal such as a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a portable/dongle type mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. May be realized. Further, the earth terminal device 40 may be realized as a terminal that performs M2M (Machine To Machine) communication (also referred to as an MTC (Machine Type Communication) terminal). Further, the earth terminal device 40 may be a wireless communication module mounted on these terminals (for example, an integrated circuit module configured by one die).
[0239]
　　<6.1. Application Example Regarding Base Station>
　　　(First Application Example)
　FIG. 21 is a block diagram showing a first example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 800 has one or more antennas 810 and a base station device 820. Each antenna 810 and the base station device 820 can be connected to each other via an RF cable.
[0240]
　Each of the antennas 810 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for the base station apparatus 820 to transmit and receive radio signals. The eNB 800 has a plurality of antennas 810 as illustrated in FIG. 21, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, respectively. Note that FIG. 21 shows an example in which the eNB 800 has a plurality of antennas 810, but the eNB 800 may have a single antenna 810.
[0241]
　The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
[0242]
　The controller 821 may be, for example, a CPU or a DSP, and operates various functions of the upper layer of the base station device 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors, and may transfer the generated bundled packet. In addition, the controller 821 is a logic that executes control such as radio resource management (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), admission control (Admission Control) or scheduling (Scheduling). It may have a general function. Further, the control may be executed in cooperation with the surrounding eNB or core network node. The memory 822 includes a RAM and a ROM, and stores a program executed by the controller 821 and various control data (for example, a terminal list, transmission power data, scheduling data, etc.).
[0243]
　The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. Controller 821 may communicate with core network nodes or other eNBs via network interface 823. In that case, the eNB 800 and the core network node or another eNB may be connected to each other by a logical interface (for example, the S1 interface or the X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a higher frequency band for wireless communication than the frequency band used by the wireless communication interface 825.
[0244]
　The wireless communication interface 825 supports a cellular communication scheme such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to a terminal located in the cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and each layer (eg, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP). (Packet Data Convergence Protocol). The BB processor 826 may have some or all of the above-described logical functions instead of the controller 821. The BB processor 826 may be a module that includes a memory that stores a communication control program, a processor that executes the program, and a related circuit. The function of the BB processor 826 may be changed by updating the program. Good. Further, the module may be a card or a blade inserted in the slot of the base station device 820, or a chip mounted on the card or the blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal through the antenna 810.
[0245]
　The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 21, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800. The wireless communication interface 825 may include a plurality of RF circuits 827 as shown in FIG. 21, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. 21 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. But it's okay.
[0246]
　In the eNB 800 illustrated in FIG. 21, the acquisition unit 41, the setting unit 42, and/or the message transmission/reception unit 43 described with reference to FIG. It may be implemented in the controller 821 and/or the network interface 823. For example, the wireless communication interface 825, the controller 821, and/or the network interface 823 acquires setting information from the satellite station device 10, and transmits a channel/signal to the satellite station device 10 using a transmission parameter according to the setting information. I do. For example, in the processor included in the wireless communication interface 825, functions for performing these operations may be implemented. The eNB 800, the base station device 820, or the above module may be provided as a device for performing such an operation, or a program for causing a processor to perform the above operation may be provided. A readable recording medium recording the above program may be provided.
[0247]
　　　(Second Application Example)
　FIG. 22 is a block diagram showing a second example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 830 has one or more antennas 840, a base station device 850, and an RRH 860. Each antenna 840 and RRH 860 may be connected to each other via an RF cable. Further, the base station device 850 and the RRH 860 can be connected to each other by a high speed line such as an optical fiber cable.
[0248]
　Each of the antennas 840 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the RRH 860. The eNB 830 includes a plurality of antennas 840 as illustrated in FIG. 22, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, respectively. Note that FIG. 22 shows an example in which the eNB 830 has a plurality of antennas 840, but the eNB 830 may have a single antenna 840.
[0249]
　The base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG.
[0250]
　The wireless communication interface 855 supports a cellular communication scheme such as LTE or LTE-Advanced, and provides a wireless connection to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 or the like. The BB processor 856 is the same as the BB processor 826 described with reference to FIG. 21 except that the BB processor 856 is connected to the RF circuit 864 of the RRH 860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as shown in FIG. 22, and the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 22 shows the example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.
[0251]
　The connection interface 857 is an interface for connecting the base station device 850 (radio communication interface 855) to the RRH 860. The connection interface 857 may be a communication module for communication on the high-speed line that connects the base station device 850 (radio communication interface 855) and the RRH 860.
[0252]
　The RRH 860 also includes a connection interface 861 and a wireless communication interface 863.
[0253]
　The connection interface 861 is an interface for connecting the RRH 860 (radio communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on the high speed line.
[0254]
　The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include an RF circuit 864 or the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal through the antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 22, and the plurality of RF circuits 864 may correspond to a plurality of antenna elements, respectively. 22 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.
[0255]
　In the eNB 830 illustrated in FIG. 22, the acquisition unit 41, the setting unit 42, and/or the message transmission/reception unit 43 described with reference to FIG. RF circuit 864), controller 851 and/or network interface 853. For example, the wireless communication interface 855, the wireless communication interface 863, the controller 851, and/or the network interface 853 acquires the setting information from the satellite station device 10 and sends the setting information to the satellite station device 10 using the transmission parameter according to the setting information. Performs channel/signal transmission. For example, the functions included in the wireless communication interface 855 and/or the processor included in the wireless communication interface 863 may be implemented to perform these operations. The eNB 830, the base station device 850, or the above module may be provided as a device that performs such an operation, or a program for causing a processor to perform the above operation may be provided. A readable recording medium recording the above program may be provided.
[0256]
　　<6.2. Application Example Regarding Terminal Device>
　　　(First Application Example)
　FIG. 23 is a block diagram showing an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, and one or more antenna switches 915. It comprises one or more antennas 916, a bus 917, a battery 918 and an auxiliary controller 919.
[0257]
　The processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900. The memory 902 includes RAM and ROM, and stores programs and data executed by the processor 901. The storage 903 may include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
[0258]
　The camera 906 has, for example, an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. The sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor, for example. The microphone 908 converts a voice input to the smartphone 900 into a voice signal. The input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button or a switch, and receives an operation or information input from the user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays the output image of the smartphone 900. The speaker 911 converts the audio signal output from the smartphone 900 into audio.
[0259]
　The wireless communication interface 912 supports a cellular communication method such as LTE or LTE-Advanced and executes wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may perform, for example, encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and perform various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal through the antenna 916. The wireless communication interface 912 may be a one-chip module in which the BB processor 913 and the RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as shown in FIG. Although FIG. 23 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. But it is okay.
[0260]
　Further, the wireless communication interface 912 may support other types of wireless communication systems such as a short-range wireless communication system, a close proximity wireless communication system, and a wireless LAN (Local Area Network) system in addition to the cellular communication system, In that case, the BB processor 913 and the RF circuit 914 for each wireless communication system may be included.
[0261]
　Each of the antenna switches 915 switches the connection destination of the antenna 916 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 912.
[0262]
　Each of the antennas 916 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving a radio signal by the radio communication interface 912. The smartphone 900 may have a plurality of antennas 916 as shown in FIG. Although FIG. 23 shows an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0263]
　Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication system. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.
[0264]
　The bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. .. The battery 918 supplies power to each block of the smartphone 900 shown in FIG. 23 via a power supply line partially shown by a broken line in the figure. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode, for example.
[0265]
　In the smartphone 900 illustrated in FIG. 23, the acquisition unit 41, the setting unit 42, and/or the message transmission/reception unit 43 described with reference to FIG. 17 includes the wireless communication interface 912 (for example, the RF circuit 914 and/or the BB processor 913). , Processor 901, and/or auxiliary controller 919. For example, the wireless communication interface 912, the processor 901, and/or the auxiliary controller 919 obtains the setting information from the satellite station device 10, and uses the transmission parameter according to the setting information to transmit the channel/signal to the satellite station device 10. Send. For example, in the processor included in the wireless communication interface 912, functions for performing these operations may be mounted. The smartphone 900 or the above module may be provided as a device that performs such an operation, or a program for causing a processor to perform the above operation may be provided. A readable recording medium recording the above program may be provided.
[0266]
　　　(Second Application Example)
　FIG. 24 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. An interface 933, one or more antenna switches 936, one or more antennas 937 and a battery 938 are provided.
[0267]
　The processor 921 may be, for example, a CPU or a SoC, and controls the navigation function and other functions of the car navigation device 920. The memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.
[0268]
　The GPS module 924 measures the position (eg, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites. The sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor, for example. The data interface 926 is connected to the in-vehicle network 941 via a terminal (not shown), and acquires data generated on the vehicle side such as vehicle speed data.
[0269]
　The content player 927 plays the content stored in the storage medium (eg, CD or DVD) inserted in the storage medium interface 928. The input device 929 includes, for example, a touch sensor that detects a touch on the screen of the display device 930, a button or a switch, and receives an operation or information input from the user. The display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of reproduced content. The speaker 931 outputs the navigation function or the sound of the reproduced content.
[0270]
　The wireless communication interface 933 supports a cellular communication method such as LTE or LTE-Advanced and executes wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may perform, for example, encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and perform various signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal through the antenna 937. The wireless communication interface 933 may be a one-chip module in which the BB processor 934 and the RF circuit 935 are integrated. The wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935, as shown in FIG. Note that FIG. 24 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, but the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. But it's okay.
[0271]
　Further, the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a close proximity wireless communication system, and a wireless LAN system in addition to the cellular communication system. A BB processor 934 and an RF circuit 935 for each communication method may be included.
[0272]
　Each of the antenna switches 936 switches a connection destination of the antenna 937 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 933.
[0273]
　Each of the antennas 937 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the radio communication interface 933. The car navigation device 920 may have a plurality of antennas 937 as shown in FIG. Although FIG. 24 shows an example in which the car navigation device 920 has a plurality of antennas 937, the car navigation device 920 may have a single antenna 937.
[0274]
　Further, the car navigation device 920 may include an antenna 937 for each wireless communication system. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.
[0275]
　The battery 938 supplies electric power to each block of the car navigation device 920 shown in FIG. 24 through a power supply line partially shown by a broken line in the figure. Further, the battery 938 stores electric power supplied from the vehicle side.
[0276]
　In the car navigation device 920 illustrated in FIG. 24, the acquisition unit 41, the setting unit 42, and/or the message transmission/reception unit 43 described with reference to FIG. 17 includes the wireless communication interface 933 (for example, the RF circuit 935 and/or the BB processor). 934) and/or may be implemented in processor 921. For example, the wireless communication interface 933 and/or the processor 921 acquires setting information from the satellite station device 10 and transmits a channel/signal to the satellite station device 10 using a transmission parameter according to the setting information. For example, in the processor included in the wireless communication interface 933, functions for performing these operations may be mounted. As a device that performs such an operation, the car navigation device 920 or the above module may be provided, or a program for causing a processor to perform the above operation may be provided. A readable recording medium recording the above program may be provided.
[0277]
　The technology according to the present disclosure may be implemented as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the vehicle-mounted network 941.
[0278]
　<<7. Conclusion>> The
　embodiment of the present disclosure has been described above in detail with reference to FIGS. 1 to 24. As described above, the satellite station device 10 according to the present embodiment, based on the information about the satellite station device 10, sets the setting information about the transmission parameter used for transmitting the signal from the earth terminal device 40 to the satellite station device 10. It transmits to the earth terminal device 40. On the other hand, the earth terminal device 40 acquires the setting information transmitted by the satellite station device 10, and transmits a signal to the satellite station device 10 using the transmission parameter according to the acquired setting information. Since the earth terminal device 40 can use the transmission parameter suitable for transmitting the signal to the satellite station device 10 based on the setting information acquired from the satellite station device 10, it is possible to improve the wireless link quality. It will be possible.
[0279]
　Furthermore, the transmission parameter is determined based on the prediction of the position of the satellite station device 10. More specifically, the transmission parameter is determined by predicting the position of the satellite station device 10 at the time when the uplink signal transmitted by the earth terminal device 40 is predicted to be received by the satellite station device 10. Therefore, the earth terminal device 40 uses the optimum transmission parameter for the position of the satellite station device 10, which is predicted to be located at the time when the satellite station device 10 is predicted to receive the signal to be transmitted. A signal can be transmitted. Therefore, it is possible to improve the wireless link quality related to the transmission from the earth terminal device 40 to the satellite station device 10.
[0280]
　Although the preferred embodiments of the present disclosure have been described above in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can conceive various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that the invention also belongs to the technical scope of the present disclosure.
[0281]
　For example, although the satellite station device 10 has been described as generating the setting information in the above embodiment, the present technology is not limited to this example. For example, the setting information may be generated by another device (for example, the control entity in the core network 21 or the VSAT 30). Further, the transmission parameter determination body may be a device other than the satellite station device 10 and the earth terminal device 40.
[0282]
　Further, the processes described by using the flowcharts and the sequence diagrams in this specification do not necessarily have to be executed in the illustrated order. Some processing steps may be performed in parallel. In addition, additional processing steps may be adopted, and some processing steps may be omitted.
[0283]
　In addition, the effects described in the present specification are merely illustrative or exemplary, and are not limiting. That is, the technique according to the present disclosure can exert other effects that are apparent to those skilled in the art from the description of the present specification, in addition to or instead of the above effects.
[0284]
　The following configurations also belong to the technical scope of the present disclosure.
(1)
　A base station device configured as a satellite station device,
　wherein, based on information about the base station device, setting information about transmission parameters used for transmitting a signal from the terminal device to the base station device is set at the terminal. A
base station device comprising: a control unit for transmitting to the device.
(2) The
　base station device according to (1), wherein the transmission parameter is determined based on a prediction of the position of the base station device.
(3) The
　base station device according to (2), wherein the transmission parameter is determined based on prediction of a position of the base station device at a time when the signal is predicted to be received by the base station device.
(4)
　The base station device according to any one of (1) to (3), wherein the setting information includes the transmission parameter.
(5)
　The base station device according to (4), wherein the setting information includes a plurality of associations of information indicating a transmission time and the transmission parameters to be used in the transmission time.
(6)
　The base station device according to (5), wherein the setting information is transmitted for each of the terminal devices.
(7)
　The base station device according to (4), wherein the setting information includes a plurality of associations of information indicating a transmission time and information indicating a transmission position with the transmission time and the transmission parameter to be used at the transmission position.
(8)
　The base station device according to (7), wherein the setting information is notified to a plurality of the terminal devices.
(9) The
　base station device according to any one of (1) to (3), wherein the setting information includes position information and orbit information of the base station device.
(10)
　The base station apparatus according to any one of (1) to (9), wherein the transmission parameter includes a timing advance value.
(11)
　The base station apparatus according to any one of (1) to (10), wherein the transmission parameter includes a parameter related to beam tracking.
(12) In
　any one of (1) to (11), the transmission parameter includes at least one of transmission power, MCS (Modulation and Coding Scheme), number of layers, number of repeated transmissions, and resource block. The described base station device.
(13) The
　base station device according to any one of (1) to (12), wherein the setting information is generated based on position information and orbit information of the base station device.
(14)
　The base station device according to any one of (1) to (13), wherein the setting information is generated based on a measurement signal transmitted from the terminal device to the base station device.
(15)
　Setting information based on information about a base station device configured as a satellite station device, the setting information about a transmission parameter used for transmitting a signal from a terminal device to the base station device is acquired, and the setting is performed. And a control unit that transmits the signal using the transmission parameter according to information
.
(16) The
　setting information includes a plurality of associations of information indicating a transmission time and the transmission parameters to be used in the transmission time, and the
　control unit associates the transmission time of the signal in the setting information. The terminal device according to (15), wherein the terminal transmits the signal using the transmitted transmission parameter.
(17) The
　setting information includes a plurality of associations of information indicating a transmission time and information indicating a transmission location, and the transmission time and the transmission parameter to be used at the transmission location, and the
　control unit sets the setting information. The terminal device according to (15), wherein the signal is transmitted using the transmission parameter associated with the transmission time and the transmission place of the signal.
(18) The
　setting information includes position information and orbit information of the base station device, and the
　control unit determines the transmission parameter based on the position information and orbit information of the base station device, (15) Terminal device according to.
(19) The
　terminal device according to any one of (15) to (18), wherein the control unit determines the transmission parameter further based on position information of the terminal device.
(20)
　A method executed by a base station device configured as a satellite station device, which
　relates to a transmission parameter used for transmitting a signal from a terminal device to the base station device, based on information about the base station device. Transmitting setting information to the terminal device
.
(21)
　A method executed by a terminal device, which is
　setting information based on information about a base station device configured as a satellite station device, and is used for transmitting a signal from the terminal device to the base station device. Acquiring the setting information on the transmission parameter and transmitting the signal using the transmission parameter according to the setting information
.
(22) 　Control for causing a computer to transmit setting information regarding a transmission parameter used for transmitting a signal from a terminal device to the base station device to the terminal device, based on information regarding a base station device configured as
　a
satellite station device
A recording medium in which a program for functioning as a unit is recorded.
(23)
　Computer
　It is setting information based on information about a base station device configured as a satellite station device, and acquires the setting information about a transmission parameter used for transmitting a signal from a terminal device to the base station device, according to the setting information. A control unit for transmitting the signal using the transmission parameter,
and a recording medium having a program recorded thereon for functioning as the control unit .
Explanation of symbols
[0285]
　10 satellite station device
　11 acquisition unit
　12 setting unit
　13 message transmission/reception unit
　20 aviation station device
　30 earth station
　31 core network
　32 Internet
　33 terrestrial network
　40 earth terminal device
　41 acquisition unit
　42 setting unit
　43 message transmission/reception unit
　100 base station device
　101 upper level Layer processing unit
　103 Control unit
　105 Receiving unit
　1051 Decoding unit
　1053 Demodulating unit
　1055 Demultiplexing unit 1055 Demultiplexing unit
　1057 Radio receiving unit
　1059 Channel measuring unit
　107 Transmitting unit
　1071 Encoding unit
　1073 Modulating unit
　1075 Multiplexing unit
　1077 Radio transmitting unit
　1079 downlink reference signal generation unit
　109 transmission/reception antenna
　200 terminal device
　201 upper layer processing unit
　203 control unit
　205 reception unit
　2051 decoding unit
　2053 demodulation unit
　2055 demultiplexing unit
　2057 radio reception unit
　2059 channel measurement unit
　207 transmission unit
　2071 encoding unit
　2073 Modulator
　2075 Multiplexer
　2077 Radio transmitter
　2079 Uplink reference signal generator

claims
[Claim 1]
　A base station device configured as a satellite station device,
　wherein setting information regarding a transmission parameter used for transmitting a signal from a terminal device to the base station device is transmitted to the terminal device based on the information regarding the base station device. A
base station device comprising:
[Claim 2]
　The base station device according to claim 1, wherein the transmission parameter is determined based on a prediction of a position of the base station device.
[Claim 3]
　The base station device according to claim 2, wherein the transmission parameter is determined based on prediction of a position of the base station device at a time when the signal is predicted to be received by the base station device.
[Claim 4]
　The base station apparatus according to claim 1, wherein the setting information includes the transmission parameter.
[Claim 5]
　The base station apparatus according to claim 4, wherein the setting information includes a plurality of associations of information indicating a transmission time and the transmission parameters to be used at the transmission time.
[Claim 6]
　The base station device according to claim 5, wherein the setting information is transmitted for each terminal device.
[Claim 7]
　The base station apparatus according to claim 4, wherein the setting information includes a plurality of associations of information indicating a transmission time and information indicating a transmission position with the transmission time and the transmission parameter to be used at the transmission position.
[Claim 8]
　The base station device according to claim 7, wherein the setting information is reported to a plurality of the terminal devices.
[Claim 9]
　The base station device according to claim 1, wherein the setting information includes position information and orbit information of the base station device.
[Claim 10]
　The base station apparatus according to claim 1, wherein the transmission parameter includes a timing advance value.
[Claim 11]
　The base station apparatus according to claim 1, wherein the transmission parameter includes a parameter related to beam tracking.
[Claim 12]
　The base station apparatus according to claim 1, wherein the transmission parameter includes at least one of transmission power, MCS (Modulation and Coding Scheme), the number of layers, the number of repeated transmissions, and resource blocks.
[Claim 13]
　The base station device according to claim 1, wherein the setting information is generated based on position information and orbit information of the base station device.
[Claim 14]
　The base station apparatus according to claim 1, wherein the setting information is generated based on a measurement signal transmitted from the terminal apparatus to the base station apparatus.
[Claim 15]
　It is setting information based on information about a base station device configured as a satellite station device, and acquires the setting information about transmission parameters used for transmitting a signal from a terminal device to the base station device, and according to the setting information. And a control unit that transmits the signal using the transmission parameter
.
[Claim 16]
　The setting information includes a plurality of associations of information indicating a transmission time and the transmission parameter to be used in the transmission time, and the
　control unit, in the setting information, is associated with the transmission time of the signal. The terminal device according to claim 15, wherein the signal is transmitted using a transmission parameter.
[Claim 17]
　The setting information includes a plurality of associations of information indicating a transmission time and information indicating a transmission location, and the transmission parameter to be used at the transmission time and the transmission location, and the
　control unit, in the setting information, The terminal device according to claim 15, wherein the signal is transmitted using the transmission parameter associated with a signal transmission time and a transmission location.
[Claim 18]

　The terminal according to claim 15, 　wherein the setting information includes position information and orbit information of the base station device, and the control unit determines the transmission parameter based on the position information and orbit information of the base station device. apparatus.
[Claim 19]
　The terminal device according to claim 15, wherein the control unit determines the transmission parameter further based on position information of the terminal device.
[Claim 20]
　A method executed by a base station device configured as a satellite station device,
　comprising setting information on transmission parameters used for transmitting a signal from a terminal device to the base station device, based on information on the base station device. Transmitting to the terminal device
.