Specification
Title of invention: Wireless communication device, wireless communication method, and computer program
Technical field
[0001]
　The present disclosure relates to a wireless communication device, a wireless communication method, and a computer program.
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)”, “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 fifth generation mobile radio communication (5G), NRAT, and FEUTRA. In LTE and NR, a base station device (base station) is also referred to as an eNodeB (evolved NodeB) or a gnodeB (gNB), and a terminal device (mobile station, mobile station device, terminal) is also referred to as a UE (User Equipment). 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 a 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. One of the technologies studied in NR is Non-Orthogonal Multiple Access (NOMA). This is a technique for improving frequency utilization efficiency by using non-orthogonal resources in addition to orthogonal resources, and details are disclosed in Non-Patent Document 1.
Summary of the invention
Problems to be Solved by the Invention
[0004]
　As described above, in NR, in order to support various use cases, it is required to realize communication having higher frequency utilization efficiency than LTE.
[0005]
　Therefore, the present disclosure proposes a new and improved wireless communication device, wireless communication method, and computer program that can further improve the transmission efficiency of the entire system.
Means for solving the problem
[0006]
　According to the present disclosure, a communication unit that performs wireless communication and a setting used for transmission control or reception control by the communication unit are selected according to whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access. A wireless communication device including a control unit is provided.
[0007]
　Further, according to the present disclosure, a processor performs wireless communication, and settings used for transmission control or reception control in the wireless communication depending on whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access. A wireless communication method is provided that includes switching and performing.
[0008]
　Further, according to the present disclosure, wireless communication is performed to a computer, and settings used for transmission control or reception control in the wireless communication according to whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access. There is provided a computer program for switching and executing.
Effect of the invention
[0009]
　As described above, according to the present disclosure, it is possible to provide a new and improved wireless communication device, wireless communication method, and computer program that can further improve the transmission efficiency of the entire system.
[0010]
　Note that the above effects are not necessarily limited, and in addition to or in place 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
[0011]
FIG. 1 is a diagram showing an example of setting a component carrier in the present embodiment.
FIG. 2 is a diagram showing an example of setting a component carrier in the present embodiment.
FIG. 3 is a diagram showing an example of a parameter set relating to a transmission signal in an NR cell.
FIG. 4 is a diagram showing an example of an
NR downlink subframe in the present embodiment. FIG. 5 is a diagram showing an example of an NR uplink subframe in the present embodiment.
FIG. 6 is a schematic block diagram showing the configuration of a base station device 1 of this embodiment.
FIG. 7 is a schematic block diagram showing the configuration of the terminal device 2 of the present embodiment.
FIG. 8 is an explanatory diagram for explaining an outline of an example of NOMA transmission.
FIG. 9 is an explanatory diagram for explaining an outline of an example of NOMA transmission.
FIG. 10 is an explanatory diagram for explaining an outline of an example of NOMA transmission.
FIG. 11 is an explanatory diagram for explaining an outline of an example of NOMA transmission.
FIG. 12 is an explanatory diagram for explaining an outline of an example of NOMA transmission.
FIG. 13 is an explanatory diagram for explaining an outline of Grant based transmission.
FIG. 14 is an explanatory diagram for explaining an outline of Grant based transmission.
FIG. 15 is an explanatory diagram for explaining an overview of Code Block Group (CBG).
FIG. 16 is an explanatory diagram for explaining an overview of a Code Block Group (CBG).
FIG. 17 is an explanatory diagram for explaining an overview of Code Block Group (CBG).
FIG. 18 is an explanatory diagram for explaining an overview of Code Block Group (CBG).
FIG. 19A is a flowchart showing an operation example of the base station device 1 and the terminal device 2 according to the present embodiment.
FIG. 19B is a flowchart showing an operation example of the base station device 1 and the terminal device 2 according to the present embodiment.
FIG. 20 is an explanatory diagram showing an example of a flag area for discriminating between OMA and NOMA.
FIG. 21 is an explanatory diagram showing an example of resources of CORESET, Search Space, and DCI.
FIG. 22 is an explanatory diagram showing an example of resources of CORESET, Search Space, and DCI.
FIG. 23 is an explanatory diagram showing an example of resources of CORESET, Search Space, and DCI.
FIG. 24 is an explanatory diagram showing an example of switching the HARQ Process Number between OMA transmission and NOMA transmission.
FIG. 25 is an explanatory diagram showing an example in which the number of HARQ processes is switched between OMA transmission and NOMA transmission.
FIG. 26 is a block diagram showing a first example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied.
FIG. 27 is a block diagram showing a second example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied.
[FIG. 28] A schematic configuration of a smartphone to which the technology according to the present disclosure may be applied It is a block diagram which shows an example.
FIG. 29 is a block diagram showing an example of a schematic configuration of a car navigation device to which the technology according to the present disclosure can be applied.
MODE FOR CARRYING OUT THE INVENTION
[0012]
　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.
[0013]
　The description will be given in the following order.
　1. Embodiment
　2 of the present disclosure Application example
　3. Summary
[0014]
　<1. Embodiments of the present disclosure>
　　 In this embodiment, a wireless communication system includes at least a base station device 1 and a terminal device 2. The base station device 1 can accommodate a plurality of terminal devices. The base station device 1 can be connected to other base station devices by means of an X2 interface. Further, the base station device 1 can be connected to an EPC (Evolved Packet Core) by means of the S1 interface. Further, the base station device 1 can be connected to an MME (Mobility Management Entity) by means of an S1-MME interface and can be connected to an S-GW (Serving Gateway) by means of an S1-U interface. The S1 interface supports a many-to-many connection between the MME and/or S-GW and the base station device 1. Further, in the present embodiment, the base station device 1 and the terminal device 2 respectively support LTE and/or NR.
[0015]
　　 In this embodiment, the base station device 1 and the terminal device 2 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.
[0016]
　The downlink communication is communication from the base station device 1 to the terminal device 2. The uplink communication is communication from the terminal device 2 to the base station device 1. The side link communication is communication from the terminal device 2 to another terminal device 2.
[0017]
　Sidelink communication is defined for proximity direct detection and proximity direct communication between terminals. The side link communication can use the same frame configuration as the uplink and the downlink. In addition, side link communication may be limited to a part (subset) of uplink resources and/or downlink resources.
[0018]
　The base station device 1 and the terminal device 2 can support communication using a set of one or more cells in the downlink, the uplink, and/or the side link. 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.
[0019]
　FIG. 1 is a diagram showing an example of setting a component carrier in 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 standalone communication. Functions for stand-alone communication include functions necessary for initial connection.
[0020]
　FIG. 2 is a diagram showing an example of component carrier settings 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 the 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.
[0021]
　　 In
　each NR cell, one or more predetermined parameters are used for a certain predetermined time length (for example, subframe). That is, in the NR cell, the downlink signal and the uplink signal are generated for one predetermined time length using one or more predetermined parameters. In other words, the terminal device 2 generates the downlink signal transmitted from the base station device 1 and the uplink signal transmitted to the base station device 1 with one or more predetermined parameters for each predetermined time length. Is assumed to be done. In addition, in the base station device 1, a downlink signal transmitted to the terminal device 2 and an uplink signal transmitted from the terminal device 2 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 by 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).
[0022]
　A plurality of types of combinations of predetermined parameters set in the NR cell can be defined in advance as a parameter set.
[0023]
　FIG. 3 is a diagram showing an example of a parameter set relating to a transmission signal in an NR cell. In the example of FIG. 3, the parameters regarding the transmission signal included in the parameter set are the subframe interval, the number of subcarriers per resource block in the NR cell, the number of symbols per subframe, and the CP length type. The CP length type is a CP length type used in the NR cell. For example, CP length type 1 corresponds to a normal CP in LTE, and CP length type 2 corresponds to an extended CP in LTE.
[0024]
　The parameter set related to the transmission signal in the NR cell can be individually specified for the downlink and the uplink. Also, the parameter set relating to the transmission signal in the NR cell can be set independently for the downlink and the uplink.
[0025]
　FIG. 4 is a diagram showing an example of NR downlink subframes in 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 downlink resource grid. The base station device 1 can transmit an NR physical downlink channel and/or an NR physical downlink signal in a downlink subframe to the terminal device 2. The terminal device 2 can receive the NR physical downlink channel and/or the NR physical downlink signal in the downlink subframe from the base station device 1.
[0026]
　FIG. 5 is a diagram showing an example of NR uplink subframes in the present embodiment. In the example of FIG. 5, 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. 5 is also referred to as an NR uplink resource grid. The base station device 1 can transmit the NR physical uplink channel and/or the NR physical uplink signal in the uplink subframe to the terminal device 2. The terminal device 2 can receive the NR physical uplink channel and/or the NR physical uplink signal in the uplink subframe from the base station device 1.
[0027]
　　
　FIG. 6 is a schematic block diagram showing the configuration of the base station device 1 of this embodiment. As illustrated, the base station device 1 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. Further, 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 measuring 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.
[0028]
　As described above, the base station device 1 can support one or more RATs. Some or all of the units included in the base station apparatus 1 illustrated in FIG. 6 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 1 shown in FIG. 6 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.
[0029]
　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. 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.
[0030]
　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 1.
[0031]
　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 or common to the terminal devices connected to the base station device. 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. 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.
[0032]
　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 is performed. Management regarding NR includes setting and processing of parameter sets regarding transmission signals in NR cells.
[0033]
　In radio resource control in upper layer processing section 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.
[0034]
　In subframe setting in the upper 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 upper layer processing section 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.
[0035]
　In the scheduling control in the upper layer processing unit 101, based on the received channel state information and the channel estimation value and channel quality input from the channel measurement unit 1059, the frequency and subframe to which the physical channel is allocated, the physical channel The coding rate, the modulation method, the 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.
[0036]
　In the CSI report control in the upper layer processing unit 101, the CSI report of the terminal device 2 is controlled. For example, the setting regarding the CSI reference resource to be assumed for calculating the CSI in the terminal device 2 is controlled.
[0037]
　Under the control of the control unit 103, the reception unit 105 receives the signal transmitted from the terminal device 2 via the transmission/reception antenna 109, further performs reception processing such as separation, demodulation, and decoding, and outputs the reception-processed information. Output to the control unit 103. The receiving process in the receiving unit 105 is performed based on the settings specified in advance or the settings notified by the base station device 1 to the terminal device 2.
[0038]
　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 The frequency domain signal is extracted by Transform: FFT.
[0039]
　The demultiplexing unit 1055 demultiplexes the uplink channel and/or the uplink reference signal such as PUCCH or PUSCH from the signal input from the radio receiving 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 from the estimated value of the propagation path input from the channel measuring unit 1059.
[0040]
　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.
[0041]
　The decoding unit 1051 performs a decoding process on the coded bits of the demodulated uplink channel. The decoded uplink data and/or uplink control information is output to the control section 103. Decoding section 1051 performs decoding processing on PUSCH for each transport block.
[0042]
　The channel measurement unit 1059 measures the estimated value of the propagation path and/or the quality of the channel 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, UL-DMRS measures the estimated value of the propagation path for performing propagation path compensation for PUCCH or PUSCH, and SRS measures the quality of the uplink channel.
[0043]
　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 1 to the terminal apparatus 2, or the settings notified via the PDCCH or EPDCCH transmitted in the same subframe. Done.
[0044]
　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. Modulation section 1073 modulates the coded bits input from coding section 1071 by a predetermined modulation scheme such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. The downlink reference signal generation unit 1079 generates a downlink reference signal based on a physical cell identification (PCI), an RRC parameter set in the terminal device 2, and the like. The multiplexing unit 1075 multiplexes the modulation symbol of each channel and the downlink reference signal, and arranges them in a predetermined resource element.
[0045]
　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 analog signal conversion, quadrature modulation, conversion of intermediate frequency signal to high frequency signal (up convert), removal of extra frequency components, power amplification, etc. .. The transmission signal output by the wireless transmission unit 1077 is transmitted from the transmission/reception antenna 109.
[0046]
　　
　FIG. 7 is a schematic block diagram showing the configuration of the terminal device 2 in the present embodiment. As illustrated, the terminal device 2 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. The receiving unit 205 includes a decoding unit 2051, a demodulation unit 2053, a demultiplexing unit 2055, a radio receiving unit 2057, and a channel measuring unit 2059. Further, 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.
[0047]
　As described above, the terminal device 2 can support one or more RATs. Some or all of the units included in the terminal device 2 illustrated in FIG. 7 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 2 shown in FIG. 7 can 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.
[0048]
　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.
[0049]
　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. The control unit 203 may be used to control the whole or a part of the terminal device 2.
[0050]
　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 specified in advance and/or the settings based on the control information set or notified from the base station apparatus 1. For example, the control information from the base station device 1 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.
[0051]
　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 is performed. Management regarding NR includes setting and processing of parameter sets regarding transmission signals in NR cells.
[0052]
　In the radio resource control in the upper layer processing unit 201, management of setting information in the own device is performed. 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.
[0053]
　In the subframe setting in upper layer processing section 201, subframe setting in base station apparatus 1 and/or a base station apparatus different from base station apparatus 1 is managed. The subframe setting includes an uplink or downlink setting for the subframe, a subframe pattern setting, an uplink-downlink setting, an uplink reference UL-DL setting, and/or a downlink reference UL-DL setting. The subframe setting in upper layer processing section 201 is also referred to as terminal subframe setting.
[0054]
　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 1.
[0055]
　In CSI report control in upper layer processing section 201, control relating to CSI reporting to base station apparatus 1 is performed. For example, in the CSI report control, the setting relating to the CSI reference resource to be assumed for calculating the CSI in the channel measuring unit 2059 is controlled. In CSI report control, the resource (timing) used for reporting CSI is controlled based on DCI and/or RRC parameters.
[0056]
　Under the control of the control unit 203, the reception unit 205 receives the signal transmitted from the base station device 1 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 processing in the reception unit 205 is performed based on a preset setting, or a notification or setting from the base station device 1.
[0057]
　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 Transform: FFT) to extract the frequency domain signal.
[0058]
　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 receiving 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.
[0059]
　The demodulation unit 2053 demodulates the received signal to the downlink channel modulation symbol by using a modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. The demodulation unit 2053 separates and demodulates the MIMO-multiplexed downlink channels.
[0060]
　The decoding unit 2051 performs a decoding process on the demodulated coded bits of the downlink channel. The decoded downlink data and/or the downlink control information is output to the control section 203. The decoding unit 2051 performs a decoding process on the PDSCH for each transport block.
[0061]
　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 a channel estimation value for channel compensation for PDSCH or EPDCCH. The CRS measures a channel estimation value for 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 measuring unit 2059 calculates RSRP (Reference Signal Received Power) and/or RSRQ (Reference Signal Received Quality) based on the CRS, CSI-RS, or the detection signal, and outputs the RSRP (Reference Signal Received Quality) to the upper layer processing unit 201.
[0062]
　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 device 1.
[0063]
　The coding unit 2071 performs predetermined coding such as block coding, convolutional coding, and turbo coding on the HARQ indicator (HARQ-ACK), the uplink control information, and the uplink data input from the control unit 203. 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 2 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.
[0064]
　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 analog signal conversion, quadrature modulation, conversion of intermediate frequency signal to high frequency signal (up convert), removal of extra frequency components, power amplification, etc. .. The transmission signal output by the wireless transmission unit 2077 is transmitted from the transmission/reception antenna 209.
[0065]
　　 The
　base station device 1 and the terminal device 2 can use various methods for signaling (notifying, notifying, setting) of the 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) for notifying the terminal device 2 of the peculiar control information, or common RRC signaling (Common RRC signaling) for notifying the base station device 1 of the peculiar control information. .. Signaling used by higher layers from the physical layer, such as RRC signaling and MAC signaling, is also called upper layer signaling.
[0066]
　RRC signaling is realized by signaling RRC parameters. MAC signaling is realized by signaling MAC control elements. The physical layer signaling is realized by signaling downlink control information (DCI) or uplink control information (UCI). 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).
[0067]
　　 The
　base station device 1 and the terminal device 2 can use various methods for signaling (notifying, notifying, setting) of the 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) for notifying the terminal device 2 of the peculiar control information, or common RRC signaling (Common RRC signaling) for notifying the base station device 1 of the peculiar control information. .. Signaling used by higher layers from the physical layer, such as RRC signaling and MAC signaling, is also called upper layer signaling.
[0068]
　RRC signaling is realized by signaling RRC parameters. MAC signaling is realized by signaling MAC control elements. The physical layer signaling is realized by signaling downlink control information (DCI) or uplink control information (UCI). 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).
[0069]
　　
　DCI is notified using a DCI format having fields defined in advance. Predetermined information bits are mapped to the fields defined in the DCI format. The DCI notifies downlink scheduling information, uplink scheduling information, side link scheduling information, a request for aperiodic CSI reporting, or an uplink transmission power command.
[0070]
　The DCI format monitored by the terminal device 2 is determined by the transmission mode set for each serving cell. That is, a part of the DCI format monitored by the terminal device 2 may differ depending on the transmission mode. For example, the terminal device 2 in which the downlink transmission mode 1 is set monitors the DCI format 1A and the DCI format 1. For example, the terminal device 2 in which the downlink transmission mode 4 is set monitors the DCI format 1A and the DCI format 2. For example, the terminal device 2 in which the uplink transmission mode 1 is set monitors the DCI format 0. For example, the terminal device 2 in which the uplink transmission mode 2 is set monitors the DCI format 0 and the DCI format 4.
[0071]
　The control region in which the PDCCH for notifying the DCI for the terminal device 2 is arranged is not notified, and the terminal device 2 detects the DCI for the terminal device 2 by blind decoding (blind detection). Specifically, the terminal device 2 monitors the set of PDCCH candidates in the serving cell. Monitoring means attempting to decode with every monitored DCI format for each PDCCH in the set. For example, the terminal device 2 attempts decoding for all aggregation levels, PDCCH candidates, and DCI formats that may be transmitted to the terminal device 2. The terminal device 2 recognizes the DCI (PDCCH) that has been successfully decoded (detected) as the DCI (PDCCH) for the terminal device 2.
[0072]
　Cyclic Redundancy Check (CRC) is added to DCI. The CRC is used for DCI error detection and DCI blind detection. CRC (CRC parity bit) is scrambled by RNTI (Radio Network Temporary Identifier). The terminal device 2 detects whether or not it is DCI for the terminal device 2 based on the RNTI. Specifically, the terminal device 2 descrambles the bit corresponding to the CRC with a predetermined RNTI, extracts the CRC, and detects whether the corresponding DCI is correct.
[0073]
　The RNTI is defined or set according to the purpose or use of the DCI. RNTI includes C-RNTI (Cell-RNTI), SPS C-RNTI (Semi Persistent Scheduling C-RNTI), SI-RNTI (System Information-RNTI), P-RNTI (Paging-RNTI), RA-RNTI (Random Access). -RNTI), TPC-PUCCH-RNTI (Transmit Power Control-PUCCH-RNTI), TPC-PUSCH-RNTI (Transmit Power Control-PUSCH-RNTI), temporary C-RNTI, M-RNTI (MBMS (Multimedia Broadcast Muticast Services) )-RNTI) and eIMTA-RNTI.
[0074]
　C-RNTI and SPS C-RNTI are RNTIs unique to the terminal device 2 in the base station device 1 (cell), and are identifiers for identifying the terminal device 2. C-RNTI is used for scheduling PDSCH or PUSCH in a certain subframe. The SPS C-RNTI is used to activate or release the periodic scheduling of resources for PDSCH or PUSCH. The control channel having the CRC scrambled by SI-RNTI is used for scheduling SIB (System Information Block). The control channel with CRC scrambled with P-RNTI is used to control paging. The control channel with CRC scrambled with RA-RNTI is used for scheduling the response to RACH. The control channel having the CRC scrambled with TPC-PUCCH-RNTI is used to perform power control of PUCCH. The control channel having the CRC scrambled with TPC-PUSCH-RNTI is used to perform power control of PUSCH. The control channel having the CRC scrambled with the Temporary C-RNTI is used by the mobile station apparatus in which the C-RNTI is not set or recognized. The control channel with M-RNTI scrambled CRC is used for scheduling MBMS. The control channel having the CRC scrambled by the eIMTA-RNTI is used in the dynamic TDD (eIMTA) to notify the information about the TDD UL/DL setting of the TDD serving cell. The DCI format may be scrambled by a new RNTI, not limited to the above RNTI.
[0075]
　The scheduling information (downlink scheduling information, uplink scheduling information, side link scheduling information) includes information for performing scheduling in resource blocks or resource block groups as frequency domain scheduling. The resource block group is a set of contiguous resource blocks and indicates resources allocated to the scheduled terminal device. The size of the resource block group depends on the system bandwidth.
[0076]
　　
　DCI is transmitted using a control channel such as PDCCH or EPDCCH. The terminal device 2 monitors the set of PDCCH candidates and/or the set of EPDCCH candidates of one or more activated serving cells set by RRC signaling. Here, monitoring refers to trying to decode the PDCCH and/or EPDCCH in the set corresponding to all monitored DCI formats.
[0077]
　The set of PDCCH candidates or the set of EPDCCH candidates is also referred to as a search space. A shared search space (CSS) and a terminal-specific search space (USS) are defined in the search space. CSS may be defined only for the search space for PDCCH.
[0078]
　The CSS (Common Search Space) is a search space that is set based on the parameters unique to the base station device 1 and/or the parameters defined in advance. For example, CSS is a search space commonly used by a plurality of terminal devices. Therefore, the base station apparatus 1 maps a common control channel in a plurality of terminal apparatuses to CSS, thereby reducing resources for transmitting the control channel.
[0079]
　The USS (UE-specific Search Space) is a search space that is set using at least parameters specific to the terminal device 2. Therefore, the USS is a search space unique to the terminal device 2, and a control channel unique to the terminal device 2 can be individually transmitted. Therefore, the base station device 1 can efficiently map the control channels unique to the plurality of terminal devices.
[0080]
　The USS may be set to be commonly used by a plurality of terminal devices. Since the common USS is set for the plurality of terminal devices, the parameters unique to the terminal device 2 are set to have the same value among the plurality of terminal devices. For example, the unit set to the same parameter among a plurality of terminal devices is a cell, a transmission point, or a group of predetermined terminal devices.
[0081]
　The search space for each aggregation level is defined by the set of PDCCH candidates. Each PDCCH is transmitted using a set of one or more CCEs (Control Channel Elements). The number of CCEs used for one PDCCH is also called an aggregation level. For example, the number of CCEs used for one PDCCH is 1, 2, 4 or 8.
[0082]
　The search space for each aggregation level is defined by a set of EPDCCH candidates. Each EPDCCH is transmitted using a set of one or more ECCEs (Enhanced Control Channel Elements). The number of ECCEs used for one EPDCCH is also called an aggregation level. For example, the number of ECCEs used for one EPDCCH is 1, 2, 4, 8, 16 or 32.
[0083]
　The number of PDCCH candidates or EPDCCH candidates is determined at least based on the search space and the aggregation level. For example, in CSS, the numbers of PDCCH candidates at aggregation levels 4 and 8 are 4 and 2, respectively. For example, in the USS, the numbers of PDCCH candidates in aggregations 1, 2, 4 and 8 are 6, 6, 2 and 2, respectively.
[0084]
　Each ECCE is composed of a plurality of EREGs (Enhanced resource element groups). EREG is used to define a mapping for resource elements of EPDCCH. In each RB pair, 16 EREGs, numbered 0 to 15, are defined. That is, EREG0 to EREG15 are defined in each RB pair. In each RB pair, EREG0 to EREG15 are cyclically defined with priority given to the frequency direction with respect to resource elements other than resource elements to which predetermined signals and/or channels are mapped. For example, the resource element to which the demodulation reference signal associated with the EPDCCH transmitted by the antenna ports 107 to 110 is mapped does not define EREG.
[0085]
　The number of ECCEs used for one EPDCCH depends on the EPDCCH format and is determined based on other parameters. The number of ECCEs used for one EPDCCH is also called an aggregation level. For example, the number of ECCEs used for one EPDCCH is determined based on the number of resource elements that can be used for EPDCCH transmission in one RB pair, the EPDCCH transmission method, and the like. For example, the number of ECCEs used for one EPDCCH is 1, 2, 4, 8, 16 or 32. The number of EREGs used for one ECCE is 4 or 8 which is determined based on the type of subframe and the type of cyclic prefix. As the transmission method of EPDCCH, distributed transmission and distributed transmission are supported.
[0086]
　EPDCCH can use distributed or local transmission. Distributed transmission and local transmission differ in the mapping of ECCE to EREG and RB pairs. For example, in distributed transmission, one ECCE is configured by using EREGs of a plurality of RB pairs. In local transmission, one ECCE is configured using one RB pair of EREGs.
[0087]
　The base station device 1 sets the EPDCCH for the terminal device 2. The terminal device 2 monitors a plurality of EPDCCHs based on the setting from the base station device 1. A set of RB pairs in which the terminal device 2 monitors the EPDCCH can be set. The set of RB pairs is also called an EPDCCH set or an EPDCCH-PRB set. One or more EPDCCH sets can be set for one terminal device 2. Each EPDCCH set is composed of one or more RB pairs. Further, the setting regarding the EPDCCH can be individually performed for each EPDCCH set.
[0088]
　The base station device 1 can set a predetermined number of EPDCCH sets for the terminal device 2. For example, up to two EPDCCH sets can be configured as EPDCCH set 0 and/or EPDCCH set 1. Each of the EPDCCH sets can be composed of a predetermined number of RB pairs. Each EPDCCH set constitutes one set of a plurality of ECCEs. The number of ECCEs configured in one EPDCCH set is determined based on the number of RB pairs set as the EPDCCH set and the number of EREGs used in one ECCE. When the number of ECCEs configured in one EPDCCH set is N, each EPDCCH set constitutes ECCEs numbered from 0 to N-1. For example, when the number of EREGs used in one ECCE is 4, the EPDCCH set including 4 RB pairs forms 16 ECCEs.
[0089]
　　 In
　orthogonal multiple access (OMA) transmission, transmission and reception are performed using orthogonal frequency axes and time axes, for example. At this time, the frame configuration of the frequency and time resources is determined by the subcarrier interval, and it is difficult to use more resources than the number of resource elements. On the other hand, in NOMA transmission, a frame structure is determined by adding a non-orthogonal axis in addition to the orthogonal frequency axis and time axis. Note that examples of non-orthogonal axes include an Interleave pattern axis, a Spreading Pattern axis, a Scrambling Pattern axis, a Codebook axis, and a Power axis.
[0090]
　For example, FIG. 8 is an explanatory diagram for explaining an outline of an example of NOMA transmission, in which a transmission device multiplexes a transmission signal on a non-orthogonal axis and all resources to be multiplexed on the non-orthogonal axis have the same parameter set. Represents the case. Here, the transmission device indicates either the base station device 1 or the terminal device 2. The transmitter prepares a plurality of transmission signal sets for multiplexing. In FIG. 8, it is assumed that two transmission signal sets are multiplexed. Here, the number is two, but three or more transmission signal sets may be used. Further, each transmission signal set may be a transmission signal to a different receiving device or may be a transmission signal to the same receiving device. Here, the receiving device indicates either the base station device 1 or the terminal device 2. A corresponding Multiple Access (MA) signature is applied to each transmission signal set. Here, the MA signature includes, for example, Interleave pattern, Spreading Pattern, Scrambling Pattern, Codebook, Power Allocation, Repetition and the like. Further, although it is referred to as MA signature here, it may be simply referred to as Pattern or Index, and refers to an identifier such as Pattern or Index used in NOMA transmission as described above as an example, or a symbol representing Pattern itself. The signals after applying the MA signature are multiplexed on the same frequency and time resources and sent to the same antenna port.
[0091]
　Further, although transmission signal sets having the same parameter set are multiplexed in FIG. 8, transmission signal sets having different parameter sets may be multiplexed as shown in FIG. FIG. 9 is an explanatory diagram for explaining the outline of another example of NOMA transmission, and is the same as FIG. 8 except that transmission signal sets of different parameter sets are multiplexed.
[0092]
　On the other hand, as shown in FIGS. 10 and 11, there may be a method of transmitting a signal to which the MA signature is applied, without performing multiplexing in the transmitting device, and performing non-orthogonal multiplexing in the receiving device. FIG. 10 and FIG. 11 are explanatory diagrams for explaining the outline of another example of NOMA transmission, and show an example of the case where multiplexing by the transmission device is not performed. In the example shown in FIGS. 10 and 11, the corresponding MA signature is applied to each transmission signal set. Here, the MA signature includes, for example, Interleave pattern, Spreading Pattern, Scrambling Pattern, Codebook, Power Allocation, Repetition, and the like. The signal after applying the MA signature is transmitted on the same frequency and time resources and is multiplexed through the propagation channel. In this case, each transmission signal set may be transmitted from different transmission devices. Further, as shown in FIG. 11, the parameter sets of transmission signals transmitted on the same frequency and time resources may be different parameter sets.
[0093]
　FIG. 12 is an explanatory diagram for explaining the outline of an example of NOMA transmission, and shows an example of a receiving device. As shown in FIG. 12, the received signal is received in a state where a plurality of transmitted signals are multiplexed on the same frequency and time resource. Since the receiving apparatus decodes the multiplexed transmission signal set, the MA signature applied by the transmitter is applied, and a desired signal is extracted by channel equalization and an interference signal canceller. At this time, when the same MA signature is used for multiplexing, the influence of interference between the multiplexed signals becomes large and it may be difficult to perform decoding.
[0094]
　As described above, in NOMA transmission, it is necessary to share the MA signature applied in the transmission device and the reception device between the transmission device and the reception device, and apply the MA signature without duplication. In addition, when a resource is referred to in the following discussion, the MA signature is also included as one of the resources. Here, a resource including all frequency/time/MA signature may be referred to as a Multiple Access (MA) resource, and a resource including only frequency/time may be referred to as a Multiple Access (MA) Physical resource.
[0095]
　　
　Grant-free transmission is a usable frequency that is instructed in advance from the base station device 1 without the terminal device 2 receiving the dynamic resource allocation (Grant) from the base station device 1. It means that the terminal device 2 transmits using an appropriate resource from the time resource and the time resource. That is, Grant-free transmission refers to data transmission without grant in Downlink Control Information (DCI). Grant-free transmission is also called Data transmission without grant, but in the following description, it will be referred to as Grant-free transmission for convenience. In grant-free transmission, the base station device 1 may specify in advance a candidate of frequency and time resources that the terminal device 2 can select.
[0096]
　The main purpose of applying grant-free transmission is power saving of terminal device 2 and low-delay communication by reducing signaling overhead. In the conventional method, the base station device 1 notifies the terminal device 2 of the resources used in Uplink and Sidelink, so that communication can be performed without resource competition with other terminal devices 2. It was. On the other hand, in the conventional method, signaling overhead may occur due to this notification.
[0097]
　For example, FIG. 13 is an explanatory diagram for explaining an outline of Grant based transmission. In the case of Grant based transmission as shown in FIG. 13, when data is generated (S11), the terminal device 2 transmits a resource allocation request to the base station device 1 (S12). Upon receiving the resource allocation request from the terminal device 2, the base station device 1 allocates resources to the terminal device 2 (S13). Next, the terminal device 2 transmits data using the resources assigned by the base station device 1 (S14). Upon receiving the data transmitted from the terminal device 2, the base station device 1 transmits a response (eg, ACK/NACK) to the terminal device 2 (S15). Due to such a configuration, in Grant based transmission, a signaling overhead is generated due to a resource allocation request from the terminal device 2 and a resource allocation by the base station device 1.
[0098]
　On the other hand, FIG. 14 is an explanatory diagram for explaining an outline of Grant-free transmission. In the case of Grant-free transmission as shown in FIG. 14, usable resources are allocated in advance from the base station device 1 to the terminal device 2 (S21). When the data is generated (S22), the terminal device 2 transmits the data to the base station device 1 by using the resource arbitrarily selected from the resources allocated in advance (S23). Upon receiving the data transmitted from the terminal device 2, the base station device 1 transmits a response (eg, ACK/NACK) to the terminal device 2 (S24). As described above, in the case of Grant-free transmission, the resource allocation request from the terminal device 2 and the resource allocation processing by the base station device 1 in the Grant based transmission shown in FIG. 13 are reduced. Therefore, in power saving and low-delay communication required for next-generation communication, Grant-free transmission without resource allocation notification is expected as a promising technology candidate. The transmission resource in Grant-free transmission may be selected from all available bands, or may be selected from the resources designated by the base station apparatus 1 in advance.
[0099]
　
　CBG refers to a group of one or more Code Blocks (CBs). For example, as shown in FIG. 15, it is assumed that one Transport Block (TB) includes eight CBs. CBG refers to these CBs divided into one or more Groups. The example of FIG. 15 is an example in which every two CBs are grouped into four CBGs. FIG. 16 shows an example in which CBs are divided into two CBGs with one group for every four CBs. Further, it is not necessary to divide CBGs evenly. For example, as shown in FIG. 17, CBG#0 and CBG#1 include three CBs, and CBG#2 includes two CBs. Further, as shown in FIG. 18, CBG may include all CBs. Information such as how many CBGs exist and how many CBs are included in one CBG may be notified semi-statically by RRC Signaling or System Information, or dynamically by DCI. May be done. According to the notified number of CBGs and the number of CBs according to TB size, each CB is assigned to CBG according to a predetermined rule.
[0100]
　Also, whether or not to perform CBG transmission (CBG-based transmission) is set in the terminal device 2 by the base station device 1. At this time, settings can be made for each link such as downlink and uplink. If CBG-based transmission is not set, only TB transmission (TB-based transmission) will be performed.
[0101]
　In the case of CBG transmission, information such as which CBG is being transmitted is required. One of the methods of notifying this information is to notify by DCI. The CBG information included in DCI may be called CBG transmission information (CBGTI). In CBGTI, the number of bits may change depending on the number of CBGs set in advance. For example, when the number of CBGs is set to 4, it can be considered that CBGTI has a 4-bit field in DCI.
[0102]
　Furthermore, as an application of CBG, it is possible to notify the information for determining how to combine CBGs at the time of retransmission. This information is sometimes called CBG flushing out information (CBGFI). CBGFI may be present in DCI as a single bit or multiple bits. How to handle the information represented by CBGFI is considered to be implementation-dependent, but as an example, if the CBGFI bit is 0, the retransmitted CBG is treated as the initial transmission CBG, as in the normal operation. When the CBGFI bit is 1 after being combined and decoded, the retransmitted CBG may not be combined with the initially transmitted CBG, and only the retransmitted CBG may be used for decoding.
[0103]
　
　The base station device 1 or the terminal device 2 according to the present embodiment is for transmission or reception according to NOMA communication or OMA communication. By switching the settings and the like, it becomes possible to carry out wireless communication more efficiently. Here, examples of settings or the like for transmission or reception depending on whether NOMA communication or OMA communication may include parameters used for transmission control or reception control, settings relating to transmission methods, resource settings, and the like. Details of settings for transmission or reception depending on whether NOMA communication or OMA communication will be described later, and an example of a basic sequence will be described first.
[0104]
　19A and 19B are flowcharts showing an operation example of the base station device 1 and the terminal device 2 according to the present embodiment. 19A and 19B are operation examples of the base station device 1 and the terminal device 2 that switch settings and the like for transmission or reception according to NOMA communication or OMA communication.
[0105]
　The terminal device 2 notifies the base station device 1 whether it supports NOMA transmission or reception (step S301). The base station apparatus 1 sets to the terminal apparatus 2 whether there is a possibility of NOMA transmission or NOMA reception, or whether NOMA transmission or NOMA reception is guaranteed (step S302). Here, when it is set that NOMA transmission or NOMA reception may be performed, the terminal device 2 determines whether to perform NOMA transmission or NOMA reception based on a predetermined determination criterion. As an example of the predetermined determination criterion, it may be based on, for example, DCI information transmitted from the base station device 1 to the terminal device 2, or may be determined according to a predetermined rule.
[0106]
　After that, for example, it is assumed that the uplink transmission data is generated in the terminal device 2 (step S303). If necessary, the terminal device 2 requests the base station device 1 to allocate uplink resources (step S304). The base station device 1 allocates an uplink resource to the terminal device 2 if necessary (step S305). At this time, the base station apparatus 1 also notifies the terminal apparatus 2 whether or not to perform NOMA transmission, if necessary. If the determination is necessary, the terminal device 2 determines whether to perform NOMA transmission (step S306). Here, if NOMA transmission is to be performed, the terminal device 2 switches the settings and the like required for signal transmission to NOMA transmission (step S307), and performs uplink transmission (step S308).
[0107]
　If the determination is necessary, the base station device 1 that has received the uplink transmission signal determines whether to perform NOMA reception (step S309). After that, the base station device 1 switches the settings and the like required for signal reception depending on whether NOMA reception is performed (step S310), and performs reception processing (step S311).
[0108]
　Further, if downlink transmission data is generated in the base station device 1 (step S312), if the determination is necessary, the base station device 1 determines whether to perform NOMA transmission (step S313). Here, if NOMA transmission is to be performed, the base station device 1 switches the settings and the like required for signal transmission to NOMA transmission (step S314), and transmits the signal to the terminal device 2 (step S315). The terminal device 2, which has received the downlink transmission signal, determines whether or not to perform NOMA reception if the determination is necessary (step S316). After that, the terminal device 2 switches the settings and the like required for signal reception depending on whether NOMA reception is performed (step S317), and performs reception processing (step S318).
[0109]
　The basic sequence of the base station device 1 or the terminal device 2 according to this embodiment has been described above. Next, a specific example of settings that can be switched by the base station device 1 or the terminal device 2 for transmission or reception according to NOMA communication or OMA communication will be described. The process described below can be executed by the control unit 103 in the base station device 1 and the control unit 203 in the terminal device 2.
[0110]
(1. DCI Contents)
(1-1. Resource Allocation)
　For example, in the case of NOMA using functions such as Spreading and Repetition, it is conceivable that more transmission resources will be required compared to OMA. Therefore, it is conceivable that the base station device 1 or the terminal device 2 allocates resources efficiently by making the unit of allocation resources larger than that of OMA in the case of NOMA. When the resource allocation unit is larger than that of OMA, it is considered possible to reduce the number of bits to be notified by Resource Allocation.
[0111]
　For example, the base station device 1 or the terminal device 2 uses all bits for frequency/time resource allocation in OMA, some bits for frequency/time resource allocation in NOMA, and the remaining bits for MA signature allocation, etc. It may be used for other purposes. In the case of NOMA, it is possible to reduce the number of bits in the field that notifies Resource Allocation. For example, when OMA uses 8 bits for frequency/time resource allocation, NOMA may use only 4 bits for frequency/time resource allocation and the remaining 4 bits for MA signature allocation.
[0112]
(1-2. Modulation and Coding Scheme (MCS)) In
　NOMA, a plurality of different signals are multiplexed and transmitted on non-orthogonal axes. The receiver must decode the desired signal by canceling the interfering signal from the multiplexed signal. Therefore, in NOMA, it is conceivable to further strengthen the resistance to interference signals by limiting the Modulation Order and Code rate to low values. Furthermore, by limiting the value, it is possible to reduce the number of bits to be notified by MCS. For example, in NOMA, a modulation method such as QPSK (Quadrature Phase Shift Keying) or 16QAM (Quadrature Amplitude Modulation) can be used.
[0113]
　For example, the base station device 1 or the terminal device 2 uses all bits for MCS allocation in OMA, uses some bits for MCS allocation in NOMA, and uses the remaining bits for other purposes such as MA signature allocation. May be used. In the case of NOMA, it is possible to reduce the number of bits in the field that notifies MCS.
[0114]
(1-3. CBG information transmitted by
　Uplink or Downlink ) The CBG information transmitted by Uplink or Downlink may be referred to as, for example, CBG Transmission information (CBGTI). Hereinafter, for convenience, it will be referred to as CBGTI. In NOMA, a plurality of different signals are multiplexed and transmitted on non-orthogonal axes. The receiver must decode the desired signal by canceling the interfering signal from the multiplexed signal. Therefore, in NOMA, the code rate may be relatively reduced by making the TB size smaller than that of OMA. In NOMA, by lowering the code rate relative to OMA, it is possible to increase the resistance to interference signals. Furthermore, in NOMA, by reducing the TB size to be smaller than OMA, it is considered that the number of CBGs will also decrease, so it is possible to reduce the number of CBGTI bits.
[0115]
　For example, the base station device 1 or the terminal device 2 may use the field used for notification of CBGTI in OMA and the field used for notification of other uses such as assignment of MA signature in NOMA. Further, the base station device 1 or the terminal device 2 may use all bits for CBGTI in OMA, some bits for CBGTI in NOMA, and the remaining bits for other uses such as assignment of MA signature. Further, the base station device 1 or the terminal device 2 may have a CBGTI field in OMA and no CBGTI field in NOMA.
[0116]
(1-4. Information on whether
　transmitted CBG is HARQ-combined ) Whether or not transmitted CBG is HARQ-combined can be paraphrased as whether to clear the reception buffer. Further, the information regarding whether or not the transmitted CBG is HARQ-combined may be referred to as CBG flushing out information (CBGFI). Hereinafter, for convenience, it will be referred to as CBGFI.
[0117]
　In NOMA, multiple different signals are multiplexed on non-orthogonal axes and transmitted. In NOMA, a plurality of different signals are multiplexed and transmitted on non-orthogonal axes. The receiver must decode the desired signal by canceling the interfering signal from the multiplexed signal. Therefore, in NOMA, the code rate may be relatively reduced by making the TB size smaller than OMA. In NOMA, by lowering the code rate relative to OMA, the tolerance to interference signals can be increased. Furthermore, as the TB size becomes smaller, the number of CBGs will also decrease. As a result, it is considered possible to eliminate the CBGFI bit by reducing the number of CBGFI bits, or by using TB-based transmission when NOMA transmission is always performed.
[0118]
　For example, the base station device 1 or the terminal device 2 may use the field used for notification of CBGFI in OMA and the field used for notification of other uses such as assignment of MA signature in NOMA. Further, for example, the base station device 1 or the terminal device 2 may have the CBGFI field in OMA and not the CBGFI field in NOMA.
[0119]
(1-5.
　OMA /NOMA distinction flag) When OMA and NOMA are dynamically switched, different DCI contents may be generated for each transmission. In that case, since the same DCI format can be obtained by making the information sizes of DCI contents the same, it is possible to reduce the number of blind decoding of DCI.
[0120]
　Although the DCI contents are different, if the DCI format is the same, it is necessary to determine whether the contents are OMA or NOMA. Therefore, the base station device 1 or the terminal device 2 may prepare a flag for discriminating between OMA and NOMA in DCI. FIG. 20 is an explanatory diagram showing an example of a flag area for distinguishing between OMA and NOMA. The base station device 1 or the terminal device 2 sets a flag area for discriminating between OMA and NOMA when NOMA is set, and discriminates between OMA and NOMA when NOMA is not set. The flag area may not be set. Further, when NOMA is set, the base station device 1 or the terminal device 2 may newly provide a bit (for example, 1 bit) area for discrimination.
[0121]
(2. TBS Table or mathematical expression for NOMA) In the
　base station device 1 or the terminal device 2, when the TB size (TBS) determined by the TBS Index and Number of allocated resource blocks is NOMA, the value is smaller than that of OMA. You may set different TBS Tables or formulas that become smaller (or larger). In LTE, the TBS Table is described in Table 36.1.7.2.1-1 of TS36.213. Table 1 is an example of the TBS table for OMA, and Table 2 is an example of the TBS table for NOMA.
[0122]
[table 1]

[0129]
　As an example of the OMA calculation formula, a formula such as (NOMA MCS)=(OMA MCS)*(NOMA variable or constant) may be used.
[0130]
(4. Codebook Index Table or Formula for
　NOMA ) The base station device 1 or the terminal device 2 may change the table of the Precoding matrix determined by the Codebook Index to the table for NOMA during NOMA communication. The Precoding matrix for LTE is described in Table 5.3.3A.2-1 of TS36.211. Also, the base station device 1 or the terminal device 2 may change the Precoding matrix determined by the Codebook Index into a matrix for NOMA. Also, the base station device 1 or the terminal device 2 may obtain the NOMA precoding matrix by a mathematical expression. When the mathematical expression is used, a mathematical expression such as (NOMA Precoding matrix)=(OMA Precoding matrix)*(NOMA matrix) may be used.
[0131]
(5. TB-based or CBG-based) The
　base station device 1 or the terminal device 2 should always perform TB-based transmission for both OMA transmission and NOMA transmission when CBG-based transmission is not set quasi-statically. May be. Further, the base station device 1 or the terminal device 2 may perform CBG-based transmission in OMA transmission and TB-based transmission in NOMA transmission when CBG-based transmission is set quasi-statically.
[0132]
(6.
　Control Resource Set or Search Space Resource) The Control Resource Set may also be called CORESET, control subband, or the like. Hereinafter, the Control Resource Set is referred to as CORESET for convenience. CORESET represents a resource including one or a plurality of Search Spaces in which the terminal device performs blind decoding. FIG. 21 is an explanatory diagram showing an example of resources of CORESET, Search Space, and DCI. FIG. 21 shows an example including one CORESET, one Search Space, and one DCI. The base station device 1 sets CORESET in the terminal device 2. The terminal device 2 calculates the resource position of the Search Space from the set resource and decodes the DCI by blindly decoding the Search Space.
[0133]
　The base station device 1 or the terminal device 2 may notify the OMA transmission CORESET and the NOMA transmission CORESET, respectively, in advance. FIG. 22 is an explanatory diagram showing an example of resources of CORESET, Search Space, and DCI. FIG. 22 shows an example of resources of CORESET for OMA transmission, CORESET for NOMA transmission, Search Space, and DCI. The base station device 1 or the terminal device 2 switches and receives the resource of CORESET depending on whether it is OMA transmission or NOMA transmission. Further, the base station device 1 or the terminal device 2 knows from CORESET that has been successfully received whether it is OMA transmission or NOMA transmission. That is, the base station device 1 or the terminal device 2 knows that the OMA transmission is successful if the CORESET for OMA transmission is successfully received, and the NOMA transmission is successful if the CORESET for NOMA transmission is successfully received.
[0134]
　Further, the base station device 1 or the terminal device 2 may perform blind decoding of different Search Space resources depending on whether OMA transmission or NOMA transmission is performed. FIG. 23 is an explanatory diagram showing an example of resources of CORESET, Search Space, and DCI. FIG. 23 shows examples of resources of CORESET for OMA transmission, Search Space for OMA transmission and Search Space for NOMA transmission, and DCI. When the same CORESET is set for OMA transmission and NOMA transmission, the search space for OMA transmission may differ from the search space for NOMA transmission in CORESET, as shown in FIG. Each Search Space may be set in advance or may be recognized from a calculation formula. When obtaining Search Space for NOMA transmission from the calculation formula, for example, a formula such as (NOMA Search Space Resource Index) = (OMA Search Space Resource Index) * (NOMA variable or constant) may be used. ..
[0135]
(7. DMRS) The
　base station device 1 or the terminal device 2 may switch the DMRS pattern between OMA transmission and NOMA transmission. That is, the base station device 1 or the terminal device 2 may have orthogonality in OMA transmission and NOMA transmission. For example, the base station device 1 or the terminal device 2 may assign different Orthogonal Cover Codes (OCCs) to the DMRSs for OMA transmission and NOMA transmission, respectively. Further, the base station device 1 or the terminal device 2 may assign different Cyclic Shift patterns to the DMRSs of OMA transmission and NOMA transmission, respectively.
[0136]
(8. HARQ Process Number or HARQ Process Number) The
　base station device 1 or the terminal device 2 may switch the HARQ Process Number or the HARQ Process number between OMA transmission and NOMA transmission. FIG. 24 is an explanatory diagram showing an example of switching the HARQ Process Number between OMA transmission and NOMA transmission. When there is a possibility that both the OMA transmission and the NOMA transmission are transmitted, the base station device 1 or the terminal device 2 sets the HARQ Process Number of the OMA transmission to #0 and #1, and the HARQ Process Number of the NOMA transmission to #2 and #. You can divide it into three. FIG. 25 is an explanatory diagram showing an example in which the number of HARQ processes is switched between OMA transmission and NOMA transmission. When transmitting either OMA transmission or NOMA transmission, the base station device 1 or the terminal device 2 may divide the number of HARQ processes of OMA transmission into 4, the number of HARQ processes of NOMA transmission into 2, and so on.
[0137]
(9. Grant-based transmission or Grant-free transmission) The
　base station device 1 or the terminal device 2 switches between OMA transmission and NOMA transmission to perform Grant-based transmission or Grant-free transmission. Is also good. For example, the base station device 1 or the terminal device 2 may switch between Grant-based transmission such as OMA transmission and Grant-free transmission such as NOMA transmission. For example, the base station device 1 or the terminal device 2 may switch the Grant-based transmission to OMA transmission or NOMA transmission and the Grant-free transmission to NOMA transmission at all times. Whether the grant-based transmission is transmitted by OMA transmission or NOMA transmission can be notified by DCI, for example.
[0138]
(10. CSI Feedback) The
　base station device 1 or the terminal device 2 may switch CSI Feedback between OMA transmission and NOMA transmission. Examples of CSI Feedback include Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), and the like. Since NOMA transmission multiplexes different signals on non-orthogonal axes, interference between signals occurs. Therefore, it is assumed that the channel condition of NOMA transmission is worse than that of OMA transmission. Therefore, in the case of NOMA transmission, the base station device 1 or the terminal device 2 may feed back a lower CQI than the OMA transmission, or may feed back a low rank. In the case of NOMA transmission, the Precoding Matrix may be different from that of OMA transmission. Therefore, in the case of NOMA transmission, the base station device 1 or the terminal device 2 may feed back PMI different from OMA transmission.
[0139]
(11. Power Control) The
　base station device 1 or the terminal device 2 may switch the expression of Power Control between OMA transmission and NOMA transmission. In addition, the base station device 1 or the terminal device 2 may switch the execution of Power Control between OMA transmission and NOMA transmission. Depending on the NOMA transmission method, non-orthogonal multiplexing with power difference can be considered. Therefore, the base station device 1 or the terminal device 2 may use a power control formula different from that for OMA transmission at the time of NOMA transmission, or may add a NOMA transmission parameter to the power control formula for OMA transmission. .. Further, the base station device 1 or the terminal device 2 may switch ON/OFF of Power Control. As a result, it becomes possible to make a difference between the terminal devices 2 in the received power at the base station device 1 when transmitting from the terminal device 2 to the base station device 1. The terminal device 2 may switch the power control method depending on whether OMA transmission or NOMA transmission is performed.
[0140]
(12. Initial transmission or retransmission) The
　base station device 1 or the terminal device 2 may switch between initial transmission and retransmission for OMA transmission and NOMA transmission. For example, it is assumed that the base station device 1 or the terminal device 2 transmits the initial transmission by NOMA transmission. If the other party fails in reception, the base station device 1 or the terminal device 2 may switch retransmission to OMA transmission. It is expected that the reliability at the time of retransmission can be improved by making the retransmission OMA transmission and using orthogonal resources.
[0141]
(13. RNTI) The
　base station device 1 or the terminal device 2 may switch the RNTI between OMA transmission and NOMA transmission. For example, assume that DCI for OMA transmission and DCI for NOMA transmission have the same DCI format. In this case, as one method of distinguishing between DCI for OMA transmission and DCI for NOMA transmission, a method of judging from the CRC Scramble of DCI can be considered. For example, the transmitter side scrambles the DCI CRC with the OMA RNTI for OMA transmission, while scrambling the DCI CRC with the NOMA RNTI for NOMA transmission. May be switched. After receiving the DCI, the receiver decodes the DCI and then attempts to descramble the CRC with both the OMA RNTI and the NOMA RNTI to determine whether it is an OMA transmission or a NOMA transmission based on the success or failure of the CRC check. It becomes possible to judge.
[0142]
　Although an example of switching between OMA transmission and NOMA transmission has been shown in the above embodiment, the switching may be performed depending on the type of NOMA transmission. For example, switching between NOMA transmission using the Spreading function and NOMA transmission or OMA transmission not using the Spreading function is performed. Here, the case where the Spreading function is used has been described as an example, but a function such as Interleave or Repetition may be used instead. In addition, although examples of downlink and uplink have been mainly shown above, the present invention is not limited to these, and can be applied to communication with side links such as Device to Device (D2D) and relay terminals. Is. In addition, any one of the above embodiments may be applied, or a plurality of methods may be combined and implemented. Further, the present technology is not limited to the above embodiment.
[0143]
　<2. Application Example>
　The technology according to the present disclosure can be applied to various products. For example, the base station device 1 may be realized 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. Instead, the base station device 1 may be realized as another type of base station such as a NodeB or a BTS (Base Transceiver Station). The base station device 1 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) that are arranged in different locations from the main body. Further, various types of terminals described below may operate as the base station device 1 by temporarily or semi-permanently executing the base station function.
[0144]
　In addition, for example, the terminal device 2 is a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable/dongle type mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. May be realized as. In addition, the terminal device 2 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 terminal device 2 may be a wireless communication module mounted on these terminals (for example, an integrated circuit module configured by one die).
[0145]
　　<2.1. Application Example Regarding Base Station Device>
　　　(First Application Example)
　FIG. 26 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 base station device 820 may be connected to each other via an RF cable.
[0146]
　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 shown in FIG. 26, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, respectively. 26 shows an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.
[0147]
　The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
[0148]
　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 (Scheduling), and the like. 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.).
[0149]
　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.
[0150]
　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 logical functions described above 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 into 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 wireless signals via the antenna 810.
[0151]
　The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 26, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. Further, the wireless communication interface 825 may include a plurality of RF circuits 827 as shown in FIG. 26, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. Although FIG. 26 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.
[0152]
　In the eNB 800 illustrated in FIG. 26, the upper layer processing unit 101, the control unit 103, the receiving unit 105, and/or the transmitting unit 107 described with reference to FIG. 6 include the wireless communication interface 825 (for example, the BB processor 826 and/or It may be implemented in the RF circuit 827), 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 transmits the first control information and the second control information, or receives the control information request and transmits the corresponding third control information. Or 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 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. The transmit/receive antenna 109 may also be implemented in the antenna 810.
[0153]
　　　(Second Application Example)
　FIG. 27 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.
[0154]
　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. 27, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, respectively. 27 shows an example in which the eNB 830 has a plurality of antennas 840, the eNB 830 may have a single antenna 840.
[0155]
　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.
[0156]
　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. 26, 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. 27, and the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 27 shows an 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.
[0157]
　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 connecting the base station device 850 (radio communication interface 855) and the RRH 860.
[0158]
　The RRH 860 also includes a connection interface 861 and a wireless communication interface 863.
[0159]
　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.
[0160]
　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. 27, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements. 27 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.
[0161]
　In the eNB 830 illustrated in FIG. 27, the upper layer processing unit 101, the control unit 103, the receiving unit 105, and/or the transmitting unit 107 described with reference to FIG. 6 have the wireless communication interface 855 and the wireless communication interface 863 (for example, BB). Processor 856 and/or RF circuit 864), controller 851 and/or network interface 853 may be implemented. For example, the wireless communication interface 855, the wireless communication interface 863, the controller 851, and/or the network interface 853 transmits the first control information and the second control information, or receives the control information request and receives the corresponding third information. Send control information. For example, a function included in the processor included in the wireless communication interface 855 and/or 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 that causes a processor to perform the above operation may be provided. A readable recording medium recording the above program may be provided. The transmit/receive antenna 109 may also be implemented in the antenna 840.
[0162]
　　<2.2. Application Example Regarding Terminal Device>
　　　(First Application Example)
　FIG. 28 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.
[0163]
　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.
[0164]
　The camera 906 has an image sensor 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 a 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.
[0165]
　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. 28. 28 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's okay.
[0166]
　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.
[0167]
　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.
[0168]
　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 radio signals by the radio communication interface 912. The smartphone 900 may have a plurality of antennas 916 as shown in FIG. 28. 28 illustrates an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0169]
　Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication method. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.
[0170]
　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 electric power to each block of the smartphone 900 shown in FIG. 28 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.
[0171]
　In the smartphone 900 illustrated in FIG. 28, the upper layer processing unit 201, the control unit 203, the receiving unit 205, and/or the transmitting unit 207 described with reference to FIG. 7 include the wireless communication interface 912 (for example, the RF circuits 914 and/or Alternatively, it may be implemented in the BB processor 913), the processor 901, and/or the auxiliary controller 919. For example, the wireless communication interface 912, the processor 901, and/or the auxiliary controller 919 receives the first control information and the second control information, or transmits the control information request to receive the corresponding third control information. To do For example, in the processor included in the wireless communication interface 912, functions for performing these operations may be implemented. 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. The transmit/receive antenna 209 may also be implemented in the antenna 916.
[0172]
　　　(Second Application Example)
　FIG. 29 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. Interface 933, one or more antenna switches 936, one or more antennas 937 and a battery 938.
[0173]
　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.
[0174]
　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 a barometric pressure sensor, for example. The data interface 926 is connected to the vehicle-mounted network 941 via, for example, a terminal (not shown) and acquires data generated on the vehicle side such as vehicle speed data.
[0175]
　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, a button, or a switch that detects a touch on the screen of the display device 930, 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.
[0176]
　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. 29 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. But it's okay.
[0177]
　Further, the wireless communication interface 933 may support, in addition to the cellular communication system, another type of wireless communication system such as a short-range wireless communication system, a close proximity wireless communication system or a wireless LAN system. A BB processor 934 and an RF circuit 935 for each communication method may be included.
[0178]
　Each of the antenna switches 936 switches a connection destination of the antenna 937 among a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication systems).
[0179]
　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. 29 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.
[0180]
　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.
[0181]
　The battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 29 via 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.
[0182]
　In the car navigation device 920 shown in FIG. 29, the upper layer processing unit 201, the control unit 203, the receiving unit 205, and/or the transmitting unit 207 described with reference to FIG. 7 have the wireless communication interface 933 (for example, the RF circuit 935). And/or BB processor 934) and/or may be implemented in processor 921. For example, the wireless communication interface 933 and/or the processor 921 receives the first control information and the second control information, or transmits the control information request and receives the corresponding third control information. For example, a function included in the processor included in the wireless communication interface 933 may be implemented to perform these operations. 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. Further, the transmitting/receiving antenna 209 may be mounted in the antenna 937.
[0183]
　Further, the technology according to the present disclosure may be realized 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.
[0184]
　The eNB shown in the above description may be a gNB (gNodeB, next Generation NodeB).
[0185]
　<3. Conclusion> As
　described above, according to the embodiment of the present disclosure, wireless communication can be performed more efficiently by switching settings or the like for transmission or reception depending on whether NOMA transmission or OMA transmission is performed. It is possible to provide the base station device 1 and the terminal device 2.
[0186]
　Each step in the process executed by each device in the present specification does not necessarily have to be processed in time series in the order described as a sequence diagram or a flowchart. For example, each step in the process executed by each device may be processed in an order different from the order described as the flowchart or in parallel.
[0187]
　Further, it is possible to create a computer program for causing hardware such as a CPU, a ROM and a RAM built in each device to exhibit the same function as the configuration of each device described above. A storage medium storing the computer program can also be provided. Further, a series of processes can be realized by hardware by configuring each function block shown in the functional block diagram by hardware.
[0188]
　The preferred embodiments of the present disclosure have been described above in detail with reference to the accompanying drawings, but 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. It is understood that the above also naturally belongs to the technical scope of the present disclosure.
[0189]
　Further, 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 obvious to those skilled in the art from the description of the present specification, in addition to or instead of the above effects.
[0190]
　The following configurations also belong to the technical scope of the present disclosure.
(1) A
　communication unit that performs wireless communication, and
　a control unit that selects a setting used for transmission control or reception control by the communication unit according to whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access. And a
wireless communication device.
(2)
　The wireless communication device according to (1), wherein the control unit selects, as the setting, a setting related to a parameter used for the transmission control or the reception control.
(3)
　The radio communication device according to (2), wherein the control unit selects, as the setting, a setting regarding a parameter in downlink control information.
(4)
　The radio communication device according to (3), wherein the control unit selects a setting related to resource allocation in downlink control information as the setting.
(5) The
　control unit selects a setting regarding a flag for determining whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access in the downlink control information as the setting. Wireless communication device.
(6)
　The wireless communication device according to (3), wherein the control unit selects a setting regarding a transport block size as the setting.
(7)
　When the wireless communication is non-orthogonal multiple access, the control unit adds the setting for non-orthogonal multiple access to the setting related to the transport block size in the case of orthogonal multiple access, according to (6) above. Wireless communication device.
(8)
　The wireless communication device according to (1), wherein the control unit selects a setting regarding a transmission method in the wireless communication as the setting.
(9) The
　control unit selects, as the setting, a transmission method that does not require prior permission from a device of the other party of the wireless communication, when the wireless communication is a non-orthogonal multiple access. Wireless communication device.
(10)
　The wireless communication device according to (8), wherein the control unit selects a setting regarding a transmission unit in the wireless communication as the setting.
(11)
　The wireless communication device according to (10), wherein when the wireless communication is a non-orthogonal multiple access, the control unit selects a transmission method in which a transmission unit in the wireless communication is a transport block unit.
(12)
　The wireless communication device according to (1), wherein the control unit selects, as the setting, a setting related to a resource used for the transmission control or the reception control.
(13) The
　wireless communication device according to (12), wherein the control unit previously notifies a device of a partner of the wireless communication of a resource set used in the non-orthogonal multiple access or the orthogonal multiple access in the wireless communication.
(14)
　The wireless communication device according to any one of (1) to (13), wherein the control unit determines whether or not the non-orthogonal multiple access is performed.
(15)
　The wireless communication device according to (14), wherein the control unit determines whether or not to implement the non-orthogonal multiple access from a resource set that has been successfully received.
(16)
　The radio communication device according to (14), wherein the control unit determines whether or not to implement the non-orthogonal multiple access based on a result of blind decoding on a search space.
(17) The
　processor
　performs wireless communication,
　and switches a setting used for transmission control or reception control in the wireless communication according to whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access. , A
wireless communication method, comprising:
(18) 　Performing wireless communication with a
　computer, 　and switching between settings used for transmission control or reception control in the wireless communication depending on whether the wireless communication is non-orthogonal multiple access or orthogonal multiple access A computer program that causes,, to execute.