Title of invention: terminal device, base station, method and recording medium
Technical field
[0001]
　The present disclosure relates to a terminal device, a base station, a method and a recording medium.
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)", "5G (No. (5th generation)”, “New Radio (NR)”, “New Radio Access Technology (NRAT)”, “Evolved Universal Terrestrial Radio Access (EUTRA)”, or “Further EUTRA (FEUTRA)”). It is being considered in the 3rd Generation Partnership Project (3GPP). In the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includes NRAT and FEUTRA. In LTE and NR, a base station device (base station) is also referred to as an eNodeB (evolved NodeB) in LTE and a gNodeB in NR, and a terminal device (mobile station, mobile station device, terminal) is also referred to as UE (User Equipment). .. LTE and NR are cellular communication systems in which a plurality of areas covered by a base station are arranged in cells. A single base station may manage multiple cells.
[0003]
　In NR, new specifications are being studied for both uplink (UL) communication and downlink (DL) communication. In particular, in NR, introduction of a UL control signal called SRS (Sounding Reference Symbol or Sounding Reference Signal) is under study. The SRS is measured by the base station, and the measurement result is used for beam management and acquisition of CSI (Channel State Information-Acquisition). Section 8.2 of the technical specification of 3GPP shown in Non-Patent Document 1 below describes standard specifications of SRS.
Prior art documents
Non-patent literature
[0004]
Non-Patent Document 1: 3GPP TS 36.213 V14.4.0 (2017-09), “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures,” Release 14
Summary of the invention
Problems to be Solved by the Invention
[0005]
　In NR, frequency resources and time resources can be variably set unlike LTE. Specifically, in NR, the subcarrier interval and the number of slots can be variably set. Since the UL control signal is transmitted using UL resources, it is affected by such a resource configuration having a high degree of freedom. Although Non-Patent Document 1 describes the periodic transmission of SRS, the flexible resource setting in NR is not sufficiently supported.
[0006]
　Therefore, the present disclosure provides a mechanism that more appropriately realizes transmission and reception of a periodic UL control signal in NR.
Means for solving the problems
[0007]
　According to the present disclosure, a terminal device that communicates with a base station using a TDD (Time Division Duplex) system, and uplink control that is periodically arranged in each of a plurality of bandwidth parts included in a component carrier A terminal device is provided that includes a control unit that transmits the uplink control signal based on setting information indicating a first resource to be used for signal transmission.
[0008]
　Further, according to the present disclosure, a base station that communicates with a terminal device using the TDD scheme, and transmission of an uplink control signal that is periodically arranged in each of a plurality of bandwidth parts included in a component carrier There is provided a base station comprising: a control unit that transmits setting information indicating a first resource to be used for the terminal device to the terminal device.
[0009]
　Also, according to the present disclosure, a method performed by a terminal device that communicates with a base station using a TDD scheme, wherein the method is periodically arranged in each of a plurality of bandwidth parts included in a component carrier, And transmitting the uplink control signal based on configuration information indicating a first resource to be used for transmitting the link control signal.
[0010]
　Further, according to the present disclosure, a method performed by a base station that communicates with a terminal device using a TDD scheme, which is periodically arranged in each of a plurality of bandwidth parts included in a component carrier, And transmitting to the terminal device configuration information indicating a first resource to be used for transmitting a link control signal.
[0011]
　Further, according to the present disclosure, a computer is used to transmit an uplink control signal, which communicates with a base station using a TDD scheme and is periodically arranged in each of a plurality of bandwidth parts included in a component carrier. A recording medium having a program recorded thereon for functioning as a control unit for transmitting the uplink control signal based on setting information indicating a first resource to be provided is provided.
[0012]
　Further, according to the present disclosure, a computer is used for transmitting an uplink control signal, which communicates with a terminal device using a TDD scheme and is periodically arranged in each of a plurality of bandwidth parts included in a component carrier. There is provided a recording medium having a program recorded thereon for functioning as a control unit for transmitting setting information indicating a first resource to be transmitted to the terminal device.
Effect of the invention
[0013]
　As described above, according to the present disclosure, a mechanism that more appropriately realizes transmission/reception of a periodic UL control signal in NR is provided. Note that the above effects are not necessarily limited, and together with the above effects 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
[0014]
FIG. 1 is a sequence diagram showing an example of the flow of processing related to SRS in NR.
FIG. 2 is a diagram showing standard specifications of a link direction configuration in LTE.
FIG. 3 is a diagram showing a frame configuration when a subcarrier interval in NR is 15 kHz.
FIG. 4 is a diagram showing a frame configuration when a subcarrier interval in NR is 30 kHz.
FIG. 5 is a diagram showing a frame configuration when a subcarrier interval in NR is 60 kHz.
FIG. 6 is a diagram showing an example of a UL slot configuration in NR.
FIG. 7 is a diagram showing an example of a DL slot configuration in NR.
FIG. 8 is a diagram showing an example of a configuration of a DL-UL slot in NR.
FIG. 9 is a diagram for explaining an example of a dynamic link direction configuration in NR.
FIG. 10 is a diagram showing an example of an OFDM symbol used for SRS transmission in NR.
FIG. 11 is a diagram showing an example of an OFDM symbol used for SRS transmission in NR.
FIG. 12 is a diagram showing an example of an OFDM symbol used for SRS transmission in NR.
FIG. 13 is a diagram showing an example of an OFDM symbol used for SRS transmission in NR.
FIG. 14 is a diagram showing an example of the overall configuration of a system according to the present embodiment.
FIG. 15 is a block diagram showing an example of a configuration of a base station according to the present embodiment.
FIG. 16 is a block diagram showing an example of a configuration of a terminal device according to the present embodiment.
FIG. 17 is a diagram for explaining an example of setting a first resource according to the present embodiment.
FIG. 18 is a diagram for explaining an example of setting a first resource according to the present embodiment.
FIG. 19 is a diagram for explaining an example of adaptive processing based on the setting of the first resource according to the present embodiment.
FIG. 20 is a diagram for explaining an example of adaptive processing based on the setting of the first resource according to the present embodiment.
FIG. 21 is a diagram for explaining an example of adaptive processing based on the setting of the first resource according to the present embodiment.
FIG. 22 is a diagram for explaining an example of a quasi-static SRS configuration according to the present embodiment.
FIG. 23 is a diagram for explaining an example of a quasi-static SRS configuration according to the present embodiment.
[Fig. 24] Fig. 24 is a diagram for explaining an example of determining whether or not SRS transmission is possible for a DL-UL slot according to the present embodiment.
[Fig. 25] Fig. 25 is a diagram for explaining an example of determination of whether or not SRS transmission is possible for a DL-UL slot according to the present embodiment.
FIG. 26 is a diagram for explaining an example of SRS transmission control based on a dynamic link direction configuration according to the present embodiment.
FIG. 27 is a diagram for explaining an example of SRS transmission control based on a dynamic link direction configuration according to the present embodiment.
FIG. 28 is a diagram for explaining an example of SRS transmission control based on a dynamic link direction configuration according to the present embodiment.
FIG. 29 is a sequence diagram showing an example of a flow of control processing for periodic SRS transmission executed in the system according to the present embodiment.
FIG. 30 is a block diagram showing a first example of a schematic configuration of an eNB.
FIG. 31 is a block diagram showing a second example of a schematic configuration of an eNB.
FIG. 32 is a block diagram showing an example of a schematic configuration of a smartphone.
FIG. 33 is a block diagram showing an example of a schematic configuration of a car navigation device.
MODE FOR CARRYING OUT THE INVENTION
[0015]
　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.
[0016]
　The description will be given in the following order.
　　1. Introduction
　　2. Configuration example
　　3. Technical features
　　4. Application example
　　5. Summary
[0017]
　<<1. Introduction >>
[0018]
　(1) Use of
　SRS The SRS is a UL control signal. The SRS can also be regarded as a reference signal. The purpose of SRS includes beam management and acquisition of CSI.
[0019]
　Beam management
　Beam management is a procedure for identifying an appropriate beam used between a base station and a terminal device. Among other things, SRS-based UL beam management identifies appropriate beams for UL transmission. Specifically, in UL beam management, an appropriate combination of a transmit beam (TX beam) used by a terminal device for transmitting a UL signal and a receive beam (RX beam) used by a base station for receiving a UL signal is required. To be identified. Here, the appropriate beam refers to a beam with which the base station can receive the signal transmitted by the terminal device with the maximum reception power.
[0020]
　UL beam management includes a procedure called beam sweeping that transmits and receives SRS while directing the directivity of TX and RX beams in different directions. The terminal device transmits the SRS while sweeping the TX beam, and the base station receives the SRS while sweeping the RX beam. Then, a combination of beams with which the base station can receive the SRS transmitted by the terminal device with the maximum reception power is identified as an appropriate combination of beams. The SRS is a known signal.
[0021]
　-Acquisition of CSI Acquisition of
　CSI is performed for communication control according to the channel state. In particular, the acquisition of UL CSI based on SRS is performed for controlling UL communication according to channel conditions. For example, the base station measures the state of the UL channel based on the received SRS and determines the MCS (Modulation Coding Scheme) according to the channel state. When the SRS is transmitted/received using the beam identified by the beam management described above, the base station can determine an appropriate MCS for communication using the beam. The MCS is a combination of the modulation method and the coding rate.
[0022]
　Since beam management is a procedure for knowing the beam direction, one or two antenna ports (that is, virtual antennas) used for SRS transmission are sufficient. On the other hand, regarding acquisition of CSI of UL, when MIMO (multiple-input and multiple-output) of four layers is performed, it is desirable that the SRS be transmitted using four antenna ports. This is because it is desirable to measure the channel condition in the same environment as when the user data is actually transmitted.
[0023]
　· SRS related process flow
　Figure 1 is a sequence diagram showing an example of the flow of processing relating to SRS in NR. As shown in FIG. 1, a base station and a terminal device are involved in this sequence. Hereinafter, for convenience of description, the SRS transmitted and received for beam management is also referred to as BM-SRS. Further, the SRS transmitted/received for acquisition of CSI is also referred to as CSI-SRS.
[0024]
　First, the base station transmits the SRS configuration for beam management to the terminal device (step S12). The SRS configuration for beam management is setting information regarding BM-SRS. The terminal device transmits BM-SRS while performing TX beam sweeping based on the SRS configuration for beam management (step S14). On the other hand, the base station receives the BM-SRS while performing RX beam sweeping (step S16). Then, the base station identifies the optimum TX beam and RX beam (step S18).
[0025]
　Next, the base station transmits the SRS configuration for acquisition of CSI to the terminal device (step S20). The SRS configuration for acquiring CSI is setting information regarding CSI-SRS. Next, the terminal device transmits CSI-SRS based on the SRS configuration for acquisition of CSI (step S22). Next, the base station measures the channel condition based on the received CSI-SRS and identifies the optimum MCS (step S24). Next, the base station transmits information indicating the optimum MCS to the terminal device (step S26). Then, the terminal device transmits UL traffic (data signal or control signal) using the optimum beam and the optimum MCS (step S28).
[0026]
　The SRS configuration for beam management and the SRS configuration for CSI acquisition include information for setting frequency resources and time resources to be used for SRS transmission. The SRS configuration for CSI acquisition may include information indicating the optimal TX beam identified by beam management, in which case the terminal device transmits CSI-SRS using the optimal TX beam. be able to.
[0027]
　BM-SRS and CSI-SRS have basically the same structure, but have different requirements regarding frequency resources and time resources to be used for transmission. For example, since beam management aims to identify the optimum beam, the frequency bandwidth of BM-SRS may be narrow. Further, it is desirable that the BM-SRS is transmitted periodically for beam tracking in which the beam follows the movement of the terminal device. On the other hand, since the purpose of CSI acquisition is to identify the optimum MCS, it is desirable that the frequency bandwidth of CSI-SRS covers the frequency bandwidth used for transmitting UL traffic. Also, the CSI-SRS is preferably transmitted periodically when UL traffic is transmitted periodically, while CSI-SRS is transmitted according to the transmission of UL traffic when UL traffic is transmitted sporadically. It is sufficient if it is transmitted aperiodically.
[0028]
　(2) Periodic transmission of
　SRS The SRS may be transmitted periodically or aperiodically.
[0029]
　Periodic transmission of SRS is typically performed based on quasi-static settings. For example, when the cycle in which the SRS is to be transmitted is set quasi-statically by RRC (Radio Resource Control) signaling or the like, the terminal device permanently and cyclically transmits the SRS to the base station in the latter half thereof.
[0030]
　Aperiodic transmission of SRS is typically done based on dynamic settings. For example, the terminal device transmits the SRS at the set timing each time the timing at which the SRS should be transmitted is dynamically set by the control channel, system information, or the like.
[0031]
　(3) In the link direction configuration
　NR, adoption of frequency division duplex (FDD) or time division duplex (TDD) is being considered as a duplex method. In FDD, UL and DL are operated on different frequency bands. On the other hand, in TDD, UL and DL are operated using different time resources on the same frequency band.
[0032]
　In the case of FDD, since UL communication is always possible, the terminal device can transmit SRS at arbitrary timing. Therefore, in the case of FDD, periodic transmission and aperiodic transmission of SRS are easily realized.
[0033]
　In the case of TDD, since UL communication is possible only in a time resource in which UL communication is possible, the terminal device needs to transmit the SRS in a time resource in which UL communication is possible. However, since the SRS transmission cycle does not always arrive at a time resource in which UL communication is possible, it may be difficult to periodically transmit the SRS.
[0034]
　・In the case of
　LTE In LTE, such difficulty did not occur. This is because in LTE, the position of the time resource capable of UL communication is fixed in the TDD method. Hereinafter, this point will be described in detail.
[0035]
　The LTE communication system is classified into FD-LTE that employs FDD as the duplex system and TD-LTE that employs TDD as the duplex system. Both FD-LTE and TD-LTE use a frame format in which one radio frame (having a time length of 10 msec) is composed of 10 subframes each having a time length of 1 msec. In FD-LTE, the link direction does not change with time in the same frequency band, whereas in TD-LTE, the link direction can change in subframe units.
[0036]
　In TD-LTE, a set of link directions in subframe units for each radio frame (that is, a combination of link directions of 10 subframes) is called a link direction configuration (or UL-DL configuration). In the standard specifications for LTE, seven types of link direction configurations from configurations 0 to 6 shown in FIG. 2 are defined.
[0037]
　FIG. 2 is a diagram showing standard specifications of a link direction configuration in LTE. As shown in FIG. 2, one radio frame includes 10 subframes (#0 to #9). The time length of each subframe is 1 msec, and the time length of one radio frame is 10 msec. The link direction is set in subframe units. In FIG. 2, the link direction of the subframe labeled “D” is downlink, and the subframe is referred to as a downlink subframe. The link direction of the subframe labeled “U” is uplink, and the subframe is called an uplink subframe. The subframe labeled "S" is a special subframe specific to TD-LTE. The downlink signal transmitted from the base station reaches the terminal device with a delay. The terminal device transmits the uplink signal in advance of the timing of the uplink subframe of the base station in consideration of the delay of the uplink signal reaching the base station. The special subframe is inserted at the timing of switching from the downlink subframe to the uplink subframe, and serves as a buffer period that prevents the timing of downlink signal reception and the timing of uplink signal transmission at the terminal device from overlapping. Have a role. The special subframe includes a downlink pilot time slot in which the downlink signal is received by the UE, a guard period (Guard Period), and an uplink pilot time slot in which the uplink signal is transmitted by the UE.
[0038]
　According to the link direction configuration in LTE, in any configuration, one radio frame includes at least one uplink subframe. Therefore, it is possible to set the periodicity of SRS based on the link direction configuration so that the transmission cycle of SRS arrives in the uplink subframe. According to the LTE standard specifications, the periodicity of SRS is set with reference to the table shown in Table 1 below.
[0039]
[table 1]

[0040]
　Table 1 is a table in which an index, an SRS transmission cycle, and a subframe offset that is the starting point of the transmission cycle are associated with each other. For example, in the case of the configuration 5 shown in FIG. 2, it is possible to set the SRS to be transmitted at a cycle of 10 ms with reference to the subframe #2 which is the uplink subframe. Specifically, in the case of the link direction configuration 5 shown in FIG. 2, subframe #2 is the uplink subframe. Therefore, when the SRS cycle is set to 10 ms, for example, I_SRS is set to 17 based on Table 1. By this means, the terminal device can transmit the SRS in a cycle of 10 ms from subframe #2.
[0041]
　In the case of NR-In the
　　frame configuration
　NR as well, as in LTE, one radio frame includes 10 subframes (#0 to #9), the time length of each subframe is 1 msec, and one radio The time length of the frame is 10 msec.
[0042]
　On the other hand, in NR, unlike LTE, one or more slots are included in one subframe, and the number of slots included in one subframe changes according to the subcarrier interval. According to the NR standard specifications under consideration, the correspondence between subcarrier intervals and slot settings is defined as shown in Table 2 below.
[0043]
[Table 2]

[0044]
　Table 2 shows the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols included in one slot, the number of slots included in one radio frame, and the number of slots included in one subframe, for each subcarrier interval. It's a table. As shown in Table 2, the number of OFDM symbols included in one slot is constant regardless of the subcarrier interval. On the other hand, the number of slots included in one subframe increases as the subcarrier spacing increases, and as a result, the number of slots included in one radio frame increases as the subcarrier spacing increases. As an example, a frame configuration based on the table shown in Table 2 will be described with reference to FIGS. 3 to 5.
[0045]
　FIG. 3 is a diagram showing a frame structure when the subcarrier interval in NR is 15 kHz. As shown in FIG. 3, one radio frame includes 10 subframes (#0 to #9). One subframe (#0) includes one slot (#0), so that one radio frame includes 10 slots. One slot (#0) includes 14 OFDM symbols (#0 to #13).
[0046]
　FIG. 4 is a diagram showing a frame configuration when the subcarrier interval in NR is 30 kHz. As shown in FIG. 4, one radio frame includes 10 subframes (#0 to #9). One subframe (#0) includes two slots (#0 to #1), so that one radio frame includes 20 slots. One slot (#0) includes 14 OFDM symbols (#0 to #13).
[0047]
　FIG. 5 is a diagram showing a frame structure when the subcarrier interval in NR is 60 kHz. As shown in FIG. 5, one radio frame includes 10 subframes (#0 to #9). One subframe (#0) includes four slots (#0 to #3), so that one radio frame includes 40 slots. One slot (#0) includes 14 OFDM symbols (#0 to #13).
[0048]
　It is assumed that the subcarrier interval is set statically or quasi-statically and does not switch frequently.
[0049]

　-In the 　　link direction setting NR, switching of the link direction is performed in slot units. In NR, as shown in Table 3, a plurality of types of slots having different link directions are defined.
[0050]
[Table 3]

[0051]
　According to Table 3, slots in which the link directions of the OFDM symbols included in one slot are all UL are defined. Such slots are also referred to below as UL slots. FIG. 6 is a diagram showing an example of the structure of UL slots in NR. In the example shown in FIG. 6, the subcarrier spacing is 60 kHz, and one subframe includes four slots. As shown in FIG. 6, all the link directions of the 14 OFDM symbols (#0 to #13) included in the UL slot (#0) are UL. Such an OFDM symbol whose link direction is UL is also referred to as a UL symbol below.
[0052]
　According to Table 3, slots in which the link directions of the OFDM symbols included in one slot are all DL are defined. Such a slot is also called a DL slot. FIG. 7 is a diagram showing an example of the configuration of DL slots in NR. In the example shown in FIG. 7, the subcarrier spacing is 60 kHz, and one subframe includes four slots. As shown in FIG. 7, all the link directions of the 14 OFDM symbols (#0 to #13) included in the DL slot (#0) are DL. Such an OFDM symbol whose link direction is DL is also referred to as a DL symbol below.
[0053]
　According to Table 3, a slot in which the link direction of the OFDM symbol included in one slot is switched from DL to UL is defined. Such a slot is also called a DL-UL slot. FIG. 8 is a diagram showing an example of the configuration of DL-UL slots in NR. In the example shown in FIG. 8, the subcarrier spacing is 60 kHz, and one subframe includes four slots. As shown in FIG. 8, of the 14 OFDM symbols (#0 to #13) included in the DL slot (#0), the first nine OFDM symbols (#0 to #8) have the DL direction. And the link direction of the last five OFDM symbols (#9 to #13) is UL. The switching points can be set arbitrarily, and two switching points may be set.
[0054]
　According to Table 3, slots in which the link direction of the OFDM symbol included in one slot is unknown are defined. Such a slot is also referred to as an unknown slot. The terminal device cannot use the unknown slot for UL transmission. When the base station dynamically sets the link direction of some or all of the unknown slots to UL using SFI described later, the terminal device can use the slots for UL transmission.
[0055]
　In NR, the type of slot shown in Table 3 above and the switching point in the case of DL-UL slot are set as the link direction configuration. The base station semi-statically sets the link direction configuration in the terminal device by using higher layer signaling such as RRC signaling. Such a quasi-statically set link direction configuration is also referred to as a quasi-static link direction configuration.
[0056]
　Furthermore, in NR, it is also possible to dynamically set the link direction of one or more slots. The base station dynamically sets the link direction of the slot by a DL control signal such as PDCCH (Physical Downlink Control Channel) or system information (for example, MIB (Master Information Block) or SIB (System Information Block)). Such a dynamically set link direction configuration is also referred to as a dynamic link direction configuration.
[0057]
　For example, in NR, PDCCH includes SFI (Slot Format Indicator). SFI corresponds to dynamic link direction configuration. The base station DL-transmits the PDCCH including the SFI using one or a plurality of slots, and the terminal device reconfigures the link direction configuration based on the received SFI. That is, the quasi-static link direction configuration is overwritten by the dynamic link direction configuration. This point will be described in detail with reference to FIG.
[0058]
　FIG. 9 is a diagram for explaining an example of a dynamic link direction configuration in NR. In the example shown in FIG. 9, the subcarrier spacing is 60 kHz, and one subframe includes four slots. It is assumed that slot #0 and slot #1 are set as DL slots by the quasi-static link direction configuration. As shown in FIG. 9, the PDCCH including the SFI is DL-transmitted in the first three OFDM symbols (#0 to #2) of slot #0. This SFI includes information that sets the ninth OFDM symbol (#8) of slot #0 as a switching point in the link direction and sets slot #1 as a UL slot. In that case, as shown in FIG. 9, the link direction of the OFDM symbols (#8 to #13) subsequent to the ninth OFDM symbol (#8) of slot #0 is UL, and slot #1 is the UL slot. Become. Since the UL symbol does not include the DL symbol, when the target slot is reconfigured as the UL slot using the SFI as shown in FIG. 9, the SFI is DL-transmitted in the slot before the target slot. It is desirable to do.
[0059]
　　-In the OFDM symbol
　NR required for SRS transmission , the SRS is transmitted using one OFDM symbol, two consecutive OFDM symbols, or four consecutive OFDM symbols. Typically, SRS is transmitted using the OFDM symbol at the end or the latter half of one slot. This point will be described with reference to FIGS. 10 to 13.
[0060]
　FIG. 10: is a figure which shows an example of the OFDM symbol used for transmission of SRS in NR. In the example shown in FIG. 10, the subcarrier spacing is 60 kHz, and one subframe includes four slots. Of the 14 OFDM symbols (#0 to #13) included in slot #0, the first half 13 OFDM symbols (#0 to #12) are either DL or UL in the link direction, and at least the last. The link direction of one OFDM symbol (#13) of is UL. In the example shown in FIG. 10, when the number of UL symbols used for SRS is 1, SRS is transmitted using the last one OFDM symbol (#13) whose link direction is UL.
[0061]
　FIG. 11: is a figure which shows an example of the OFDM symbol used for transmission of SRS in NR. In the example shown in FIG. 11, the subcarrier spacing is 60 kHz, and one subframe includes four slots. Of the 14 OFDM symbols (#0 to #13) included in slot #0, the first 12 OFDM symbols (#0 to #11) are either DL or UL in the link direction, and at least the last. The link direction of the two OFDM symbols (#12 to #13) is UL. In the example illustrated in FIG. 11, when the number of UL symbols used for SRS is 2, the SRS is transmitted using the last two OFDM symbols (#12 to #13) whose link direction is UL.
[0062]
　FIG. 12 is a diagram illustrating an example of an OFDM symbol used for SRS transmission in NR. In the example shown in FIG. 12, the subcarrier spacing is 60 kHz, and one subframe includes four slots. Of the 14 OFDM symbols (#0 to #13) included in slot #0, the first half 10 OFDM symbols (#0 to #9) are either DL or UL in the link direction, and at least the last. The link direction of the four OFDM symbols (#10 to #13) is UL. In the example shown in FIG. 12, when the number of UL symbols used for SRS is 4, SRS is transmitted using the last 4 OFDM symbols (#10 to #13) whose link direction is UL. ..
[0063]
　Here, the number of UL symbols is preferably equal to or more than the number of UL symbols used for SRS transmission as shown in FIGS. 10 to 12. This is because if the number of UL symbols included in a slot is less than the number of UL symbols used for SRS transmission, SRS transmission in the slot becomes difficult.
[0064]
　Further, it may be desirable that the number of UL symbols included in the slot is equal to or more than the sum of the number of UL symbols used for transmitting the SRS and a predetermined number. The predetermined number is set for adjusting the position of UL symbols used for SRS transmission. That is, the number of UL symbols required for SRS transmission may be larger than the number of UL symbols actually used for SRS transmission. This case will be described with reference to FIG.
[0065]
　FIG. 13 is a diagram illustrating an example of an OFDM symbol used for SRS transmission in NR. In the example shown in FIG. 13, the subcarrier spacing is 60 kHz, and one subframe includes four slots. Of the 14 OFDM symbols (#0 to #13) included in slot #0, the first eight OFDM symbols (#0 to #7) are either DL or UL in the link direction, and the latter half The link direction of the six OFDM symbols (#8 to #13) is UL. In the example shown in FIG. 13, when the number of UL symbols used for SRS is 4, the first four UL symbols (#8 to #11) among the last six UL symbols (#8 to #13) Is used to send the SRS. Note that the SRS transmission position is not limited to this example, and the SRS can be transmitted using any four consecutive UL symbols among the six UL symbols (#8 to #13) in the latter half. The remaining UL symbols that are not used for transmitting the SRS function as a margin period, for example, to prevent collision with a signal transmitted in another adjacent OFDM symbol or to transmit another UL signal.
[0066]
　(4) Difference between LTE and NR regarding SRS
　-First difference
　The first difference relates to the configuration of the radio frame. In LTE, the number of slots included in one subframe is fixed, but in NR, the number of slots included in one subframe is variable. Depending on the degree of freedom of the frame structure improved with NR, the difficulty of periodic transmission of SRS increases.
[0067]
　Second difference
　The second difference relates to the degree of freedom of the quasi-static link direction configuration. In LTE, seven types of link direction configurations are defined, and in each of the seven types of link direction configurations, at least one radio subframe includes one uplink subframe. However, in NR, the link direction configuration is set on a slot-by-slot basis, and the link direction of slots is set flexibly. Therefore, for example, all slots included in one radio frame may be set as DL slots, and UL transmission may not be possible within one radio frame. Since the SRS cannot be transmitted in such a radio frame, the periodic transmission of the SRS may be hindered.
[0068]
　-Third difference
　The third difference relates to the presence or absence of dynamic link direction configuration. In LTE, one of seven types of link direction configurations is set quasi-statically. On the other hand, in NR, the quasi-static setting of the link direction configuration may be overwritten by the dynamic setting. Therefore, even if periodical transmission of SRS using a quasi-statically set UL slot is possible, the UL slot is dynamically reconfigured to DL slot and periodic transmission of SRS is performed. Can be inhibited.
[0069]
　Fourth difference
　The fourth difference relates to the transmission position of the SRS. In LTE, SRS was transmitted using only the last one UL symbol. On the other hand, in NR, the number of UL symbols used for SRS transmission is not limited to one, and the SRS transmission position in a plurality of consecutive UL symbols is also arbitrary.
[0070]
　(5) Technical Problem The
　present disclosure proposes a technique for solving the following technical problem with respect to the first to fourth differences described above.
[0071]
　First Problem
　The first problem relates to the above first difference. In order to realize the periodic transmission of SRS, it is desirable to provide a mechanism corresponding to a high degree of freedom of frame configuration in NR.
[0072]
　-Second problem
　The second problem relates to the second difference. In order to realize the periodic transmission of SRS, it is desirable to provide a mechanism corresponding to the high degree of freedom of the quasi-static link direction configuration.
[0073]
　The third problem relates to the above third difference. In order to realize the periodic transmission of SRS, it is desirable to provide a mechanism corresponding to the dynamic link direction configuration.
[0074]
　The fourth problem relates to the above-mentioned fourth problem. In order to realize the periodical transmission of SRS, it is desirable to provide a mechanism corresponding to the number of UL symbols used for SRS transmission and the degree of freedom of position.
[0075]
　Hereinafter, a system according to an embodiment of the present disclosure, which can solve the above technical problem, will be described.
[0076]
　<<2. Configuration example>>
　<2.1. System Configuration Example>
　FIG. 14 is a diagram showing an example of the overall configuration of the system 1 according to the present embodiment. As shown in FIG. 14, the system 1 includes base stations 100 (100A and 100B), terminal devices 200 (200A and 200B), a core network (Core Network) 20, and a PDN (Packet Data Network) 30.
[0077]
　The base station 100 operates the cell 11 and provides a wireless service to one or more terminal devices located inside the cell 11. For example, the base station 100A provides a wireless service to the terminal device 200A, and the base station 100B provides a wireless service to the terminal device 200B. The cell 11 can be operated according to an arbitrary wireless communication system such as LTE or NR (New Radio). The base station 100 is connected to the core network 20. The core network 20 is connected to the PDN 30.
[0078]
　The core network 20 may include, for example, an MME (Mobility Management Entity), an S-GW (Serving gateway), a P-GW (PDN gateway), a PCRF (Policy and Charging Rule Function), and an HSS (Home Subscriber Server). The MME is a control node that handles signals on the control plane, and manages the moving state of the terminal device. The S-GW is a control node that handles user plane signals, and is a gateway device that switches user data transfer paths. The P-GW is a control node that handles user plane signals, and is a gateway device that serves as a connection point between the core network 20 and the PDN 30. The PCRF is a control node that controls policies such as QoS (Quality of Service) for the bearer and charging. The HSS is a control node that handles subscriber data and controls services.
[0079]
　The terminal device 200 wirelessly communicates with the base station 100 under the control of the base station 100. The terminal device 200 may be a so-called user terminal (User Equipment: UE). For example, the terminal device 200 transmits a UL signal to the base station 100 and receives a downlink DL signal from the base station 100.
[0080]
　In particular, in the present embodiment, the base station 100 and the terminal device 200 communicate with each other using the TDD method.
[0081]
　<2.2. Configuration Example of Base Station>
　FIG. 15 is a block diagram showing an example of the configuration of the base station 100 according to the present embodiment. Referring to FIG. 15, the base station 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140, and a control unit 150.
[0082]
　(1) Antenna part 110 The
　antenna part 110 radiates the signal output by the wireless communication part 120 to space as a radio wave. Further, the antenna unit 110 converts a radio wave in the space into a signal and outputs the signal to the wireless communication unit 120.
[0083]
　(2) Wireless communication unit 120 The
　wireless communication unit 120 transmits and receives signals. For example, the wireless communication unit 120 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.
[0084]
　(3) Network communication unit 130 The
　network communication unit 130 transmits and receives information. For example, the network communication unit 130 transmits information to other nodes and receives information from other nodes. For example, the other node includes another base station and a core network node.
[0085]
　(4) Storage Unit 140 The
　storage unit 140 temporarily or permanently stores a program and various data for the operation of the base station 100.
[0086]
　(5) Control Unit 150 The control unit 150
　controls the overall operation of the base station 100 and provides various functions of the base station 100. The control unit 150 includes a setting unit 151 and a communication processing unit 153.
[0087]
　The setting unit 151 has a function of making settings related to communication with the terminal device 200. For example, the setting unit 151 sets and transmits the configuration regarding the link direction to the terminal device 200. Further, the setting unit 151 sets and transmits the configuration related to SRS to the terminal device 200.
[0088]
　The communication processing unit 153 has a function of performing communication processing with the terminal device 200. For example, the communication processing unit 153 receives and measures the SRS from the terminal device 200, and performs beam management and CSI acquisition based on the measurement result.
[0089]
　The control unit 150 may further include other components other than these components. That is, the control unit 150 can perform operations other than the operations of these components.
[0090]
　<2.3. Example of Configuration of Terminal Device>
　FIG. 16 is a block diagram showing an example of the configuration of the terminal device 200 according to the present embodiment. Referring to FIG. 16, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, and a control unit 240.
[0091]
　(1) Antenna Unit 210 The
　antenna unit 210 radiates the signal output from the wireless communication unit 220 into space as a radio wave. The antenna unit 210 also converts radio waves in the space into a signal and outputs the signal to the wireless communication unit 220.
[0092]
　(2) Wireless communication unit 220 The
　wireless communication unit 220 transmits and receives signals. For example, the wireless communication unit 220 receives a downlink signal from the base station and transmits an uplink signal to the base station.
[0093]
　(3) Storage Unit 230 The
　storage unit 230 temporarily or permanently stores a program and various data for the operation of the terminal device 200.
[0094]
　(4) Control Unit 240 The control unit 240
　controls the overall operation of the terminal device 200 and provides various functions of the terminal device 200. The control unit 240 includes a setting unit 241 and a communication processing unit 243.
[0095]
　The setting unit 241 has a function of making settings related to communication with the base station 100. For example, the setting unit 241 receives the configuration regarding the link direction from the base station 100 and reflects the configuration in the communication process. Further, the setting unit 241 receives the configuration related to SRS from the base station 100 and reflects it in the communication process.
[0096]
　The communication processing unit 243 has a function of performing communication processing with the base station 100. For example, the communication processing unit 243 performs DL communication or UL communication based on the configuration regarding the link direction. In addition, the communication processing unit 243 periodically transmits the SRS based on the configuration related to the SRS, and when the periodic transmission is disturbed, the communication processing unit 243 transmits the SRS by using the alternative slot.
[0097]
　The control unit 240 may further include other components other than these components. That is, the control unit 240 can also perform operations other than the operations of these components.
[0098]
　<<3. Technical Features>> In the
　present embodiment, the resources to be used for SRS transmission are quasi-statically or dynamically set.
[0099]
　The setting information that is transmitted quasi-statically from the base station 100 to the terminal device 200 for the quasi-static configuration of the resources to be used for transmitting the SRS is also referred to as a quasi-static SRS configuration below. The quasi-static SRS configuration is transmitted using RRC signaling, for example.
[0100]
　The setting information dynamically transmitted from the base station 100 to the terminal device 200 for the dynamic setting of the resources to be used for transmitting the SRS is also referred to as a dynamic SRS configuration below. The dynamic SRS configuration is transmitted using downlink control signals such as PDCCH (Physical Downlink Control Channel) or system information (for example, MIB (Master Information Block) or SIB (System Information Block)). Among other things, the dynamic SRS configuration may be sent using SFI in the PDCCH.
[0101]
　Further, when it is not necessary to distinguish them, they are collectively referred to as an SRS configuration.
[0102]
　The SRS configuration according to the present embodiment may be used for the above-mentioned beam management or CSI acquisition.
[0103]
　<3.1. Quasi-Static SRS Configuration> The
　base station 100 transmits the quasi-static SRS configuration to the terminal device 200. The quasi-static SRS configuration is setting information indicating a first resource to be used for transmitting the SRS, which is periodically arranged. The terminal device 200 transmits the SRS in the first resource set as the resource to be used for transmitting the SRS based on the semi-static SRS configuration. As a result, the terminal device 200 can periodically transmit the SRS at the cycle set by the base station 100.
[0104]
　It should be noted that the terminal device 200 is not always able to transmit the SRS in the first resource set by the quasi-static SRS configuration. For example, when the first resource is the DL slot, the terminal device 200 cannot transmit the SRS. Further, when the quasi-static link direction configuration is overwritten by the dynamic link direction configuration (that is, SFI) and, for example, the first resource becomes a DL slot, the terminal device 200 transmits the SRS. Can not.
[0105]
　The quasi-static SRS configuration includes information indicating a radio frame in which the first resource is arranged and information indicating a slot in which the first resource is arranged in the radio frame. That is, the setting of the first resource by the quasi-static SRS configuration includes the setting of the position of the first resource in radio frame units and the setting of the position of the first resource in slot units in the radio frame. .. The former roughly sets the position of the first resource, and the latter finely sets the position of the first resource.
[0106]
　(1) Setting the Position of the First Resource in
　Radio Frame Units The setting of the position of the first resource in radio frame units sets the cycle of the first resource in units of the number of slots included in the radio frame. May be done by Here, the number of slots included in the radio frame differs depending on the subcarrier interval. Therefore, the first resource (more accurately, the radio frame including the first resource) is arranged in a cycle that is an integer multiple of the number of slots per radio frame according to the subcarrier interval. Table 4 below shows an example of the cycle of the first resource.
[0107]
[Table 4]

[0108]
　Table 4 is a table showing the number of slots included in one radio frame, the number of slots included in one subframe, and a candidate for the periodicity of the first resource for each subcarrier interval. As shown in Table 4, when the subcarrier interval is 15 kHz, the number of slots included in one radio frame is 10. Then, the candidate for the periodicity of the first resource is an integer multiple of the number of slots included in one radio frame, such as 10 slots, 20 slots, 30 slots, 40 slots, and 50 slots. For example, when the period of the first resource is set as 10 slots, the SRS is transmitted in every radio frame. In addition, when the cycle of the first resource is set to 20 slots, the SRS is transmitted every two radio frames (that is, in every other radio frame).
[0109]
　The quasi-static SRS configuration includes information indicating a cycle that is an integral multiple of the number of slots per radio frame according to the subcarrier interval described above. As a result, the terminal device 200 can transmit the SRS in every radio frame, every two radio frames, or every three radio frames, or the like in units of radio frames.
[0110]
　(2) Setting of Position of First Resource
　in Slot Unit in Radio Frame Setting of position of first resource in slot unit in radio frame is performed in a radio frame including the first resource (that is, the first resource This is performed by setting the position of the first resource in the radio frame corresponding to the period of 1) in units of slots. There are two types of setting methods, a method using a lookup table and a method not using it. Hereinafter, these setting methods will be described.
[0111]
　(2.1) Method of using
　lookup table The lookup table is a table that indicates which of the plurality of slots included in the radio frame is the first resource. The terminal device 200 transmits the SRS in the slot set as the first resource by the look-up table in the radio frame including the first resource. By using the lookup table, the position of the first resource can be set in detail.
[0112]
　In particular, the look-up table is preferably configured to set the resource capable of transmitting the SRS as the first resource based on the quasi-static link direction configuration. In this case, since the first resource is arranged in the resource capable of transmitting the SRS, the SRS can be transmitted periodically. That is, with respect to the second problem, the terminal device 200 can periodically transmit the SRS in the resource capable of transmitting the SRS set by the quasi-static link direction configuration.
[0113]
　A UL slot is an example of a resource capable of transmitting SRS. On the other hand, DL slots and unknown slots are examples of resources for which SRS transmission is not possible. Further, as will be described later, the DL-UL slot may be a resource capable of transmitting SRS or a resource not capable of transmitting SRS depending on the number and position of UL symbols.
[0114]
　An example of the lookup table is shown in Table 5 below.
[0115]
[Table 5]

[0116]
　Table 4 shows an example of the lookup table when the subcarrier spacing is 60 kHz. The number of slots included in one radio frame is 40, and each of the 40 rows of the lookup table shown in Table 4 corresponds to each slot included in one radio frame. The number of rows in the lookup table corresponds to the number of slots included in one radio frame. For example, if the subcarrier spacing is 480 kHz, the number of rows in the lookup table is 320. According to the lookup table shown in Table 4, the SRS is transmitted in the second slot (#2), the third slot (#3), the fifth slot (#5) and the 38th slot (#38). To be done.
[0117]
　An example of the setting of the first resource using the lookup table described above will be described with reference to FIG.
[0118]
　FIG. 17 is a diagram for explaining an example of setting the first resource according to the present embodiment. In the example shown in FIG. 17, it is assumed that the subcarrier spacing is 60 kHz. That is, one radio frame includes 40 slots. As shown in the upper part of FIG. 17, when the period of the first resource is set to be three times the number of slots per radio frame, that is, 120 slots, the SRS is transmitted every three radio frames. Specifically, the SRS is transmitted in the 0th radio frame (#0), the 3rd radio frame (#3), and the 6th radio frame (#6). Further, the specific setting of the position of the first resource in the radio frame including these first resources is performed by the lookup table shown in the lower part of FIG. According to the lookup table shown in the lower part of FIG. 17, the SRS in the second slot (#2), the third slot (#3), the fifth slot (#5) and the 38th slot (#38). Will be sent.
[0119]
　The method for setting the first resource using the lookup table has been described above.
[0120]
　The quasi-static SRS configuration includes information indicating a look-up table as information for setting the position of the first resource in the radio frame including the first resource. This allows the terminal device 200 to periodically transmit the SRS in the slot set by the base station 100.
[0121]
　Note that the quasi-static SRS configuration may include the lookup table itself. On the other hand, the terminal device 200 may store a plurality of lookup table candidates in advance, and which candidate should be used may be set by the quasi-static SRS configuration.
[0122]
　(2.2) Method Not Using Look-Up Table The
　terminal device 200 may recognize the position of the first resource in slot units in the radio frame based on a predetermined rule. Various predetermined rules can be considered. For example, the first resource may be arranged in slots of a predetermined number of slots in the radio frame. The terminal device 200 can transmit the SRS in the slots of the predetermined number of slots in the radio frame including the first resource. When arranging a plurality of first resources in a radio frame, the cycle of the first resource in the radio frame must be a cycle with a number of slots smaller than the number of slots per radio frame according to the subcarrier interval. Is desirable.
[0123]
　The counting of the number of slots for determining the arrival of the cycle of the first resource may be performed regardless of the type of slot, or may be performed only for the slots in which SRS can be transmitted. In the former case, slots in which SRS cannot be transmitted, such as DL slots, are also counted. In the latter case, only slots capable of transmitting SRS such as UL slots are counted. Hereinafter, each of these will be described in detail.
[0124]
　First Counting Method
　Hereinafter, a case will be described where the number of slots for determining the arrival of the period of the first resource is counted regardless of the type of slots.
[0125]
　FIG. 18 is a diagram for explaining an example of setting the first resource according to the present embodiment. In FIG. 18, the slot numbers of a plurality of slots included in a certain radio frame are shown in the first stage, the quasi-static link direction configuration is shown in the second stage, and the quasi-static SRS configuration is 3 stages. The fourth row shows whether or not the SRS is actually transmitted. Slots labeled "UL" in the second row are UL slots. Slots labeled “DL” in the second row are DL slots. The slot labeled “DL-UL” in the second row is a DL-UL slot. Slots labeled as “unknown” in the second row are unknown slots. The slot labeled “SRS” in the third row is the slot set as the first resource. Slots labeled "-" in the third row are slots that are not set as the first resource. The slot labeled “SRS” in the fourth row is the slot in which the SRS is actually transmitted. Slots labeled "-" in the fourth row are slots in which SRS is not actually transmitted. In the example shown in FIG. 18, as shown in the third row, the first resource has a period of 5 slots, and more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot. Is located in the slot (#) of. Referring to the second stage, all of these slots in which the first resource is arranged are UL slots capable of transmitting SRS. Therefore, the terminal device 200 transmits the SRS in all the set first resources.
[0126]
　Here, in NR, since the degree of freedom in quasi-static link direction configuration is higher than in LTE, the slot set as the first resource is a slot in which SRS transmission such as DL slot is impossible. There may be. In that case, the terminal device 200 skips (i.e., does not transmit) the transmission of the SRS in the slot corresponding to the set cycle, or skips and adaptively transmits the SRS using the alternative slot. Performs various processing. Hereinafter, an example of adaptive processing that the terminal device 200 can perform will be described.
[0127]
　　-First example of adaptive processing The
　terminal device 200 may skip the transmission of the SRS in the first resource when the SRS cannot be transmitted in the first resource. In this case, the terminal device 200 can reduce the processing load related to the SRS transmission by the skipped amount. Also, since the base station 100 can also skip the reception and measurement of the SRS in the set first resource, the processing load of the base station 100 can be reduced by the skipped amount. Hereinafter, a specific example of this example will be described with reference to FIG.
[0128]
　FIG. 19 is a diagram for explaining an example of adaptive processing based on the setting of the first resource according to the present embodiment. The meaning of each stage in FIG. 19 and the meaning of the label attached to each slot are the same as in FIG. In the example illustrated in FIG. 19, as shown in the third row, the first resource has a cycle of 5 slots, and more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot. Is located in the slot (#) of. Referring to the second stage, of these slots in which the first resource is arranged, the fifth slot (#5) is a DL slot in which SRS cannot be transmitted. Therefore, as shown in the fourth row, the terminal device 200 skips the transmission of the SRS in the fifth slot (#5).
[0129]
　　-Second example of adaptive processing When the
　terminal device 200 skips transmission of the SRS in the first resource according to the first example of the adaptive processing described above, the SRS after the skipped first resource You may transmit SRS in the resource which can transmit. That is, the terminal device 200 transmits the SRS in the alternative slot immediately after the skipped slot. Therefore, in the third example, it is possible to reduce the breakage of the periodicity of the SRS as compared with the first example of the adaptive processing described above. Hereinafter, a specific example of this example will be described with reference to FIG.
[0130]
　FIG. 20 is a diagram for explaining an example of adaptive processing based on the setting of the first resource according to the present embodiment. The meaning of each stage and the meaning of the label attached to each slot in FIG. 20 are the same as in FIG. 18. In the example shown in FIG. 20, as shown in the third row, the first resource has a period of 5 slots, and more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot. Is located in the slot (#) of. Referring to the second stage, of these slots in which the first resource is arranged, the fifth slot (#5) is a DL slot in which SRS cannot be transmitted. Further, referring to the second stage, the resource capable of transmitting the SRS after the fifth slot (#5) includes the eighth slot (#8) which is a UL slot. Therefore, as shown in the fourth row, the terminal device 200 skips the transmission of the SRS in the fifth slot (#5) and transmits the SRS in the eighth slot (#8).
[0131]
　　-Third example of
　adaptive processing When the number of times SRS transmission is skipped reaches a predetermined upper limit value by the first example of adaptive processing described above, the terminal device 200 skips last one. You may transmit SRS in the resource which can transmit SRS after the resource of. That is, when the number of skips reaches a predetermined upper limit value, the terminal device 200 transmits the SRS in the alternative slot immediately after the last skipped slot. Therefore, in this example, it is possible to reduce the breakage of the periodicity of the SRS, as compared with the first example of the adaptive processing described above. Further, in this example, the number of SRS transmissions can be reduced as compared with the second example of the adaptive processing described above, so the processing load on the base station 100 and the terminal device 200 can be reduced. .. Note that the terminal device 200 may transmit the SRS in the number of alternative slots (for example, the same number) according to the number of skips.
[0132]
　　-Fourth example of adaptive processing When the
　terminal device 200 skips SRS transmission according to the first example of adaptive processing described above, the terminal device 200 uses the SRS by the DL control signal after the skipped first resource. The SRS may be transmitted in the resource that is switched so that the transmission of the SRS is possible. For example, when the DL slot is switched to the UL slot by SFI, the terminal device 200 transmits the SRS in the switched UL slot. Therefore, in this example, the alternative slot can be set more flexibly than in the other examples. A specific example of this example will be described with reference to FIG.
[0133]
　FIG. 21 is a diagram for explaining an example of adaptive processing based on the setting of the first resource according to the present embodiment. The meaning of each stage and the meaning of the label attached to each slot in FIG. 21 are the same as in FIG. However, the third stage of FIG. 21 is a new stage not shown in FIG. 18, and is a dynamic link direction configuration set by a control signal. In the example shown in FIG. 21, the first resource has a period of 5 slots, more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot, as shown in the fourth row. Are placed in slots (#) of. Referring to the second stage, of these slots in which the first resource is arranged, the fifth slot (#5) is a DL slot in which SRS cannot be transmitted. Here, as shown in the third row, the seventh slot (#7) is dynamically switched by the SFI from the unknown slot to the UL slot capable of transmitting the SRS. The SFI is included in the PDCCH of the sixth slot (#6), for example. Therefore, as shown in the fifth row, the terminal device 200 skips the transmission of the SRS in the fifth slot (#5) and transmits the SRS in the seventh slot (#7).
[0134]
　The example of adaptive processing has been described above.
[0135]
　If the first counting method is adopted, the quasi-static SRS configuration includes information indicating the number of slots indicating the period of the first resource in the radio frame. In addition, the quasi-static SRS configuration includes information indicating which adaptive process should be adopted and setting information regarding the adaptive process. For example, when the third example of the adaptive processing is adopted, the quasi-static SRS configuration includes information indicating the upper limit value of the skip count.
[0136]
　-Second Counting Method
　Hereinafter, a case will be described in which the number of slots for determining the arrival of the period of the first resource is performed for slots capable of transmitting SRS such as UL slots.
[0137]
　In this case, the first resource is arranged in slots having a cycle of the number of slots in which the SRS can be transmitted in the radio frame. Furthermore, an upper limit value of the number of SRS transmissions per radio frame, in other words, an upper limit value of the number of first resources per radio frame may be set. This can prevent the SRS from being transmitted unnecessarily. An example of the configuration in this example is shown in Table 6 below.
[0138]
[Table 6]

[0139]
　Table 6 is a table showing the periodicity and the number of repeated transmissions for each configuration. For example, in the case of configuration 0, the SRS is transmitted every two UL slots (that is, in every other UL slot) in a certain radio frame, and when the SRS is transmitted three times, the SRS is transmitted in the radio frame. finish. An example of the presence or absence of SRS transmission when the configuration 0 in Table 6 is adopted will be described with reference to Table 7.
[0140]
[Table 7]

[0141]
　Table 7 shows an example of the slot number, the link direction, the UL slot number in the radio frame, and the presence or absence of SRS transmission when the configuration 0 in Table 6 is adopted for each slot in a radio frame. There is. Referring to the configuration 0 in Table 6, the SRS is transmitted every two UL slots. Therefore, as shown in Table 7, since the first slot (#1) is the 0th UL slot, the first SRS is transmitted. Since the third slot (#3) is the second UL slot, the second SRS is transmitted. Since the sixth slot (#6) is the fourth UL slot, the third SRS is transmitted. Further, referring to the configuration 0 in Table 6, when the SRS is transmitted three times, the transmission of the SRS in the radio frame ends. Therefore, the 8th slot (#8) is the 6th UL slot, but the SRS is not transmitted.
[0142]
　If the second counting method is adopted, the quasi-static SRS configuration includes information indicating the number of slots in which the SRS can be transmitted, which indicates the period of the first resource in the radio frame. Further, the quasi-static SRS configuration includes information indicating the upper limit value of the number of SRS transmissions per radio frame or the upper limit value of the number of first resources per radio frame. That is, the quasi-static SRS configuration includes the configurations shown in Table 6 above.
[0143]
　・Summary The
　method that does not use a lookup table has been described above. According to this method, the terminal device 200 can periodically transmit the SRS without using the lookup table. Specifically, with respect to the second problem, the terminal device 200 can periodically transmit the SRS in the resource capable of transmitting the SRS set by the quasi-static link direction configuration. Further, in the method that does not use the lookup table, the lookup table is not transmitted from the base station 100 to the terminal device 200. Therefore, the method that does not use the lookup table reduces the processing load of the base station 100 and the terminal device 200 and the communication load related to transmission and reception of the quasi-static SRS configuration, as compared with the case of using the lookup table. be able to.
[0144]
　In particular, the first counting method performs the counting for determining the arrival of the cycle of the first resource regardless of the type of the slot, so that the cycle of the first resource is compared with the second counting method. It is possible to reduce the loss of sex. For example, if the first example of adaptive processing is adopted in the first counting method, the slot in which the SRS can be transmitted is the same in any radio frame. On the other hand, in the second counting method, the position of the slot in which the SRS is transmitted can vary greatly depending on the position of the slot in which the SRS can be transmitted.
[0145]
　In the second counting method, the resource capable of transmitting the SRS is set as the first resource, so that the processing load is reduced as compared with the first counting method, because the adaptive processing is unnecessary. It
[0146]
　<3.2. For SRS configuration per bandwidth part>
　NR, the component carrier may include multiple bandwidth parts. In that case, different subcarrier intervals can be set for each bandwidth portion. That is, the number of slots included in one subframe may be different for each bandwidth portion.
[0147]
　Therefore, in the present embodiment, the first resource is, in each of the plurality of bandwidth parts included in the component carrier, periodically based on the number of slots per radio frame according to the subcarrier interval of the bandwidth part. Will be placed.
[0148]
　Specifically, the setting of the position of the first resource in radio frame units is performed based on the number of slots per radio frame according to the subcarrier interval of the bandwidth part. For example, the first resource is arranged at a cycle that is an integral multiple of the number of slots per radio frame according to the subcarrier interval of the bandwidth part.
[0149]
　Further, the setting of the position of the first resource in slot units in the radio frame is performed based on the number of slots per radio frame according to the subcarrier interval of the bandwidth part. For example, the lookup table is set for each bandwidth portion and has the number of rows according to the subcarrier spacing of the bandwidth portion.
[0150]
　In view of the allocation of the first resource for each bandwidth portion described above, the SRS configuration is set for each bandwidth portion. More specifically, the quasi-static SRS configuration includes information indicating a radio frame in which the first resource is arranged and a slot in which the first resource is arranged in each of the plurality of bandwidth parts. And information to indicate. Note that the periodicity of the first resource in each of the plurality of bandwidth parts may be different.
[0151]
　The terminal device 200 transmits the SRS in the first resource periodically arranged for each bandwidth portion based on the SRS configuration. With this, the terminal device 200 can realize the periodic SRS transmission according to the frame configuration with respect to the first problem.
[0152]
　Hereinafter, a specific example of the quasi-static SRS configuration in the case where the component carrier includes a plurality of bandwidth parts will be described.
[0153]
　-When a method using a lookup table is adopted
　FIG. 22 is a diagram illustrating an example of a quasi-static SRS configuration according to this embodiment. FIG. 22 shows an example in which a method using a lookup table is adopted for setting the position of the first resource in slot units in a radio frame. As shown in FIG. 22, the component carrier includes a first bandwidth portion having a subcarrier spacing of 15 kHz, a second bandwidth portion having a subcarrier spacing of 30 kHz, and a third bandwidth portion having a subcarrier spacing of 60 kHz. Including the bandwidth portion of.
[0154]
　Therefore, the position of the first resource is set for each radio frame in each of the three bandwidths by the quasi-static SRS configuration, and the position of the first resource is set for each slot in the radio frame. .. Also, a look-up table to be used in each of the three bandwidths is set.
[0155]
　When the subcarrier spacing is 15 kHz, the number of slots per radio frame is 10. Therefore, as shown in FIG. 22, in the first bandwidth portion, the first resource is arranged every N×10 slots. That is, the SRS is transmitted every N radio frames. Further, as shown in FIG. 22, the number of rows of the lookup table used in the first bandwidth portion is 10.
[0156]
　When the subcarrier spacing is 30 kHz, the number of slots per radio frame is 20. Therefore, as shown in FIG. 22, in the second bandwidth portion, the first resource is arranged every M×20 slots. That is, the SRS is transmitted every M wireless frames. Further, as shown in FIG. 22, the number of rows of the lookup table used in the second bandwidth portion is 20.
[0157]
　When the subcarrier spacing is 60 kHz, the number of slots per radio frame is 40. Therefore, as shown in FIG. 22, in the third bandwidth portion, the first resource is arranged every L×40 slots. That is, the SRS is transmitted every L radio frames. Also, as shown in FIG. 22, the number of rows of the lookup table used in the third bandwidth portion is 40.
[0158]
　-When a method that does not use a lookup table is adopted
　FIG. 23 is a diagram illustrating an example of a quasi-static SRS configuration according to the present embodiment. FIG. 23 shows an example in which a method that does not use a lookup table is used to set the position of the first resource in slot units in a radio frame. As shown in FIG. 23, the component carrier includes a first bandwidth part having a subcarrier spacing of 15 kHz, a second bandwidth part having a subcarrier spacing of 30 kHz, and a third bandwidth having a subcarrier spacing of 60 kHz. Including the bandwidth portion of. Therefore, the position of the first resource is set for each radio frame in each of the three bandwidths by the quasi-static SRS configuration, and the position of the first resource is set for each slot in the radio frame. ..
[0159]
　As shown in FIG. 23, in the first bandwidth portion, the first resource is arranged every 10 slots in the radio frame corresponding to the cycle of the first resource. In the second bandwidth part, the first resource is arranged every five slots in the radio frame corresponding to the cycle of the first resource. In the third bandwidth portion, the first resource is arranged every 20 slots in the radio frame corresponding to the cycle of the first resource.
[0160]
　<3.3. Determining Whether or Not to Transmit SRS in DL-UL Slot>
　As described above, the UL slot can be cited as a resource capable of transmitting SRS. Further, the DL-UL slot may be a resource capable of transmitting SRS or a resource not capable of transmitting SRS, depending on the number and position of UL symbols. Hereinafter, this point will be described in detail.
[0161]
　When the number of consecutive symbols capable of uplink communication per slot is equal to or more than the number of symbols required for SRS transmission, the terminal device 200 recognizes the slot as a SRS transmittable slot. .. That is, when the number of consecutive UL slots included in a slot is equal to or more than the number of OFDM symbols required for SRS transmission, the terminal device 200 recognizes the slot as a resource capable of transmitting SRS. To do. Here, as described above, the OFDM symbols required for the transmission of the SRS may include the UL symbols used for the transmission of the SRS and the UL symbols functioning as the margin period described above with reference to FIG. 13. ..
[0162]
　Furthermore, the terminal device 200 may consider the positions of the consecutive UL slots. In that case, the terminal device 200 determines that the last OFDM symbol of the slot is a UL symbol, and the number of consecutive UL symbols including the UL symbol is equal to or greater than the number of OFDM symbols required for SRS transmission. In some cases, the slot is recognized as a resource that can transmit the SRS.
[0163]
　For example, assume that the number of UL symbols required for SRS transmission is four. In that case, since the number of UL slots that are continuous at the end of the slot (#0) having the configuration illustrated in FIG. 10 is 1, the terminal device 200 recognizes the slot as an untransmittable slot. .. On the other hand, the number of consecutive UL slots at the end of the slot (#0) having the configuration shown in FIG. 12 is 4, so the terminal device 200 recognizes the slot as a slot in which the SRS can be transmitted.
[0164]
　In this way, the terminal device 200 can transmit the SRS based on the SRS configuration in the DL-UL slot recognized as the slot in which the SRS can be transmitted. Since the SRS can be transmitted not only in the UL slot but also in the DL-UL slot, the resources capable of transmitting the SRS increase. Therefore, the breakage of the periodicity of SRS can be reduced.
[0165]
　As described above, with respect to the above-mentioned fourth problem, the terminal device 200 determines whether or not the SRS can be transmitted in the DL-UL slot, which corresponds to the number of UL symbols used for SRS transmission and the degree of freedom of position. be able to.
[0166]
　Hereinafter, with reference to FIG. 24 and FIG. 25, a specific example of the transmission propriety determination for the DL-UL slot will be described.
[0167]
　FIG. 24 is a diagram for explaining an example of determining whether or not SRS transmission is possible for the DL-UL slot according to the present embodiment. In FIG. 24, the slot numbers of a plurality of slots included in a certain radio frame are shown in the first stage, the quasi-static link direction configuration is shown in the second stage, and the quasi-static SRS configuration is 3 stages. The fourth row shows whether or not the SRS is actually transmitted. The meaning of each label is the same as in FIG. The link direction configuration for each OFDM symbol of the fifth slot (#5), which is a DL-UL slot, is shown between the second stage and the third stage. The link direction of the first nine OFDM symbols (#0 to #8) included in the DL-UL slot (#5) is DL, and the latter half of the five OFDM symbols (#9 to #13) are linked. The direction is UL. Assuming that the number of UL symbols required for SRS transmission is 4, the number of consecutive UL slots at the end of the DL-UL slot (#5) is 5, so the terminal device 200 The UL slot (#5) is recognized as a slot capable of transmitting SRS. According to the quasi-static SRS configuration shown in the third row, the DL-UL slot (#5) is set as the first resource. Therefore, as shown in the fourth row, the terminal device 200 transmits the SRS in the DL-UL slot (#5).
[0168]
　FIG. 25 is a diagram for explaining an example of determining whether or not SRS transmission is possible for the DL-UL slot according to the present embodiment. The meaning of each stage in FIG. 25 and the meaning of the label attached to each slot or each OFDM symbol are the same as in FIG. The link direction of the first half 13 OFDM symbols (#0 to #12) included in the fifth slot (#5), which is a DL-UL slot, is DL, and the second half 1 OFDM symbol (#13). ), the link direction is UL. If the number of UL symbols required for SRS transmission is 2, the number of consecutive UL slots at the end of the DL-UL slot (#5) is 1. Therefore, the terminal device 200 The UL slot (#5) is recognized as a slot in which SRS cannot be transmitted. According to the quasi-static SRS configuration shown in the third row, the DL-UL slot (#5) is set as the first resource. However, since the DL-UL slot (#5) is recognized as a slot in which SRS transmission is not possible, the terminal device 200 in the DL-UL slot (#5) is identified as shown in the fourth row. Skip SRS transmission.
[0169]
　<3.4. Addressing Dynamic Link Direction Configuration> In
　NR, the quasi-static link direction configuration may be overwritten by the dynamic link direction configuration. Therefore, when the permission/inhibition of SRS transmission in the first resource is switched by the DL control signal, the terminal device 200 controls the transmission of SRS according to the switching. Specifically, when the slot set as the first resource is switched to a slot in which SRS can be transmitted or a slot in which SRS cannot be transmitted by a DL control signal such as SFI, the terminal device 200 responds to the switching. Control the transmission of SRS. With this, the terminal device 200 can deal with the third problem when the quasi-static link direction configuration is overwritten by the dynamic link direction configuration.
[0170]
　(1) When the
　transmission of the SRS in the first resource becomes possible due to the switching by the DL control signal, the first switching terminal device 200 transmits the SRS in the first resource. Specifically, when the slot set as the first resource is switched from the slot in which the SRS cannot be transmitted to the slot in which the SRS can be transmitted, the terminal device 200 transmits the SRS in the slot. The switching source is a DL slot, an unknown slot, or a DL-UL slot recognized as a resource in which the above SRS cannot be transmitted. The switching destination is a UL slot or a DL-UL slot recognized as a resource capable of transmitting the above-mentioned SRS. The combination of the switching source and the switching destination is arbitrary. Regardless of which combination is switched, the terminal device 200 can transmit the SRS that could not be originally transmitted in the first resource, so that the periodicity of the SRS can be maintained. In the following, with reference to FIG. 26, a specific example in the case where the slot set as the first resource is switched from the unknown slot to the UL slot will be described.
[0171]
　FIG. 26 is a diagram for explaining an example of SRS transmission control based on the dynamic link direction configuration according to the present embodiment. The meaning of each stage and the meaning of the label attached to each slot in FIG. 26 are the same as in FIG. As shown in the fourth row of FIG. 26, the first resource has a cycle of 5 slots, and more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot (# ) Is located. Referring to the second stage, of these slots in which the first resource is arranged, the fifth slot (#5) is an unknown slot in which SRS cannot be transmitted. However, as shown in the third row, the SFI dynamically switches the fifth slot (#5) from the unknown slot to the UL slot capable of transmitting the SRS. The SFI is included in the PDCCH of the fourth slot (#4), for example. Therefore, as shown in the fifth row, the terminal device 200 transmits the SRS in the fifth slot (#5).
[0172]
　(2) The second switching
　terminal device 200 skips the transmission of the SRS in the first resource when the transmission of the SRS in the first resource becomes impossible due to the switching by the DL control signal. Specifically, when the slot set as the first resource is switched from the slot in which SRS transmission is possible to the slot in which SRS transmission is not possible, the terminal device 200 skips SRS transmission in that slot. .. The switching source is a UL slot or a DL-UL slot recognized as a resource capable of transmitting the above-mentioned SRS. The switching destination is a DL slot, an unknown slot, or a DL-UL slot recognized as a resource in which the above SRS cannot be transmitted. The combination of the switching source and the switching destination is arbitrary. In the following, with reference to FIG. 27, a specific example will be described in which the slot set as the first resource is switched from the UL slot to the DL slot.
[0173]
　FIG. 27 is a diagram for explaining an example of SRS transmission control based on the dynamic link direction configuration according to the present embodiment. The meaning of each stage and the meaning of the label attached to each slot in FIG. 27 are the same as in FIG. As shown in the fourth row of FIG. 27, the first resource has a cycle of 5 slots, and more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot (# ) Is located. Referring to the second stage, of these slots in which the first resource is arranged, the fifth slot (#5) is a UL slot capable of transmitting SRS. However, as shown in the third row, the SFI dynamically switches the fifth slot (#5) from the UL slot to the DL slot in which the SRS cannot be transmitted. The SFI is included in the PDCCH of the fourth slot (#4), for example. Therefore, as shown in the fifth row, the terminal device 200 skips the transmission of the SRS in the fifth slot (#5).
[0174]
　-Transmission of SRS using alternative slot
　Here, the terminal device 200 may not only skip transmission of SRS in the first resource, but may also transmit SRS in the alternative slot. By transmitting the SRS in the alternative slot, it is possible to reduce the breakage of the periodicity of the SRS due to the dynamic switching of the link direction due to the SFI.
[0175]
　The selection of the alternative slot can be performed in the same manner as the adaptive processing in the method that does not use the look-up table described above. For example, when the terminal device 200 skips the transmission of the SRS in the first resource by SFI, as in the second example of the adaptive processing, the terminal device 200 can transmit the SRS after the skipped first resource. The SRS may be sent in the resource. Further, as in the third example of the adaptive processing, the terminal device 200, when the number of times the SRS transmission in the first resource is skipped by the SFI reaches a predetermined upper limit value, the first skipped last time. You may transmit SRS in the resource which can transmit SRS after the resource of. Further, when the terminal device 200 skips the transmission of the SRS in the first resource by SFI, similarly to the fourth example of the adaptive processing, the terminal device 200 uses the SRS by the DL control signal after the skipped first resource. The SRS may be transmitted in the resource that is switched so that the transmission of the SRS is possible.
[0176]
　-Regarding the second counting method,
　here, in the quasi-static SRS configuration, the setting of the position of the first resource in a slot unit in a radio frame is performed by a method that does not use a lookup table, and is described above. A case where the second counting method is adopted will be described. To describe iteratively, in the second counting method, the number of slots for determining the arrival of the period of the first resource is counted for slots that can transmit SRS, such as UL slots.
[0177]
　When the second counting method is adopted, the terminal device 200 reflects the switching by SFI and counts the number of slots for determining the arrival of the cycle of the first resource. With this, even when the second counting method is adopted, it is possible to adaptively transmit the SRS according to the switching by the SFI.
[0178]
　Specifically, the slot in which the SRS can be transmitted by switching by SFI is handled as the slot to be counted in the second counting method. That is, the slot to be counted for determining the arrival of the cycle of the first resource includes the slot that is switched by the SFI so that the SRS can be transmitted. Therefore, the terminal device 200 determines, in the quasi-static link configuration, the slot in which the SRS can be transmitted and the slot in which the SRS can be transmitted due to the switching by the SFI for the arrival of the cycle of the first resource. To count.
[0179]
　On the other hand, slots for which SRS transmission is disabled due to switching by SFI are handled as slots that are not counted by the second counting method. That is, the slot to be counted for determining the arrival of the period of the first resource does not include the slot switched to the SRS transmission by the SFI. Therefore, the terminal device 200 excludes the slot in which the SRS cannot be transmitted due to the switching by SFI from the slots in which the SRS can be transmitted in the quasi-static link configuration, and determines the period of the first resource. The number of slots is counted to determine the arrival.
[0180]
　(3) Dynamic SRS Configuration The
　dynamic SRS configuration may be set according to the dynamic link direction configuration. The base station 100 transmits a downlink control signal including a dynamic SRS configuration to the terminal device 200, and the terminal device 200 operates according to the dynamic SRS configuration.
[0181]
　The dynamic SRS configuration contains information indicating how to deal with the dynamic link direction configuration. For example, the dynamic SRS configuration may include information regarding whether to perform SRS transmission using an alternative slot and a method for selecting an alternative slot regarding the second switching described above. Further, the dynamic SRS configuration may include information regarding the above-described second switching, which sets whether or not to reflect the switching by SFI in the second counting method.
[0182]
　Furthermore, the dynamic SRS configuration may include configuration information that configures a second resource (ie an alternative slot) to be used for SRS transmission instead of the first resource. In this case, the terminal device 200 transmits the SRS in the set second resource. There are various possible methods for setting the second resource. For example, the second resource may be set by the slot number in the radio frame or may be set by the offset with respect to the first resource. Note that the setting of the second resource by the dynamic SRS configuration is such that, as compared with the fourth example of the adaptive processing described above, which slot should be set as the second resource can be set. High degree of freedom.
[0183]
　The dynamic SRS configuration may be associated with the dynamic link direction configuration. For example, SFI may include dynamic link direction configuration and dynamic SRS configuration. In that case, since the number of times of signaling is simply reduced, the communication load on the base station 100 and the terminal device 200 is reduced. For example, the SFI may include information for setting the second resource together with information for instructing the switching of the link direction that makes it impossible to transmit the SRS in the first resource. In that case, the terminal device 200 can skip the transmission of the SRS in the first resource based on the SFI and transmit the SRS in the second resource.
[0184]
　Hereinafter, with reference to FIG. 28, a specific example in the case where the SRS is transmitted in the second resource based on the dynamic SRS configuration will be described.
[0185]
　FIG. 28 is a diagram for explaining an example of SRS transmission control based on the dynamic link direction configuration according to the present embodiment. The meaning of each stage in FIG. 28 and the meaning of the label attached to each slot are the same as in FIG. 26. However, the fifth stage in FIG. 28 is a new stage not shown in FIG. 26 and shows a dynamic SRS configuration. The slot labeled as “SRS” in the fifth row is a slot set as the second resource by the dynamic SRS configuration. As shown in the fourth row of FIG. 28, the first resource has a cycle of 5 slots, and more specifically, the 0th slot (#0), the 5th slot (#5), and the 10th slot (# ) Is located. Referring to the second stage, of these slots in which the first resource is arranged, the fifth slot (#5) is an unknown slot in which SRS cannot be transmitted. On the other hand, as shown in the third row, the SFI dynamically switches the seventh slot (#7) from the unknown slot to the UL slot capable of transmitting the SRS. The SFI is included in the PDCCH of the fourth slot (#4), for example. Further, referring to the fifth row, the seventh slot (#7) is dynamically set as the second resource by the SFI. Therefore, as shown in the sixth row, the terminal device 200 skips the SRS in the fifth slot (#5) and the SRS in the seventh slot (#7) dynamically set as the second resource. To send.
[0186]
　<3.5. Process Flow>
　A process flow regarding SRS executed in the system 1 according to the present embodiment is as described with reference to FIG. In the following, among the processing related to SRS, processing related to quasi-static SRS configuration and dynamic SRS configuration will be described with reference to FIG. 29.
[0187]
　FIG. 29 is a sequence diagram showing an example of the flow of control processing for periodic SRS transmission executed in the system 1 according to the present embodiment. As shown in FIG. 29, the base station 100 and the terminal device 200 are involved in this sequence.
[0188]
　As shown in FIG. 29, first, the base station 100 transmits the quasi-static link direction configuration and the quasi-static SRS configuration to the terminal device 200 (step S102). The quasi-static SRS configuration includes information indicating the first resource periodically arranged in each of the plurality of bandwidth parts included in at least the component carrier. Next, the terminal device 200 periodically transmits the SRS using the set first resource based on the received quasi-static link direction configuration and quasi-static SRS configuration (step S104). ..
[0189]
　After that, the base station 100 transmits the dynamic link direction configuration to the terminal device 200 (step S106). When the transmission of the SRS in the first resource becomes impossible due to the dynamic link direction configuration, the terminal device 200 skips the transmission of the SRS in the first resource, or skips and substitutes the SRS. A resource is selected and SRS is transmitted (step S108). After the radio frame that is the target of the dynamic link direction configuration, the terminal device 200 periodically transmits the SRS using the set first resource, as in step S104 described above (step S110).
[0190]
　After that, the base station 100 transmits the dynamic link direction configuration and the dynamic SRS configuration to the terminal device 200 (step S112). When the transmission of the SRS in the first resource becomes impossible due to the dynamic link direction configuration, the terminal device 200 skips the transmission of the SRS in the first resource, or skips and then dynamically. The SRS is transmitted using the second resource set by the SRS configuration (step S114). After the radio frame targeted for the dynamic link direction configuration and the dynamic SRS configuration, the terminal device 200 periodically performs the SRS using the set first resource, as in step S104 described above. It is transmitted (step S116).
[0191]
　<<4. Application Examples>>
　The technology according to the present disclosure can be applied to various products. For example, the base station 100 may be implemented as an eNB (evolved Node B) of any type such as a macro eNB or a small eNB. A small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB or a home (femto) eNB. Instead, the base station 100 may be realized as another type of base station such as a NodeB or a BTS (Base Transceiver Station). The base station 100 may include a main body (also referred to as a base station device) that controls wireless communication, and one or more RRHs (Remote Radio Heads) arranged in a place different from the main body. In addition, various types of terminals described below may operate as the base station 100 by temporarily or semipermanently executing the base station function.
[0192]
　In addition, for example, the terminal device 200 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 200 may be realized as a terminal that performs M2M (Machine To Machine) communication (also referred to as an MTC (Machine Type Communication) terminal). Furthermore, the terminal device 200 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these terminals.
[0193]
　<4.1. Application Example Regarding Base Station>
　　　(First Application Example)
　FIG. 30 is a block diagram showing a first example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 800 has one or more antennas 810 and a base station device 820. Each antenna 810 and the base station device 820 can be connected to each other via an RF cable.
[0194]
　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 includes a plurality of antennas 810 as illustrated in FIG. 30, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, respectively. Although FIG. 30 illustrates an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.
[0195]
　The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
[0196]
　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. Further, the controller 821 is a logic that executes control such as radio resource management (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), admission control (Admission Control) or scheduling (Scheduling). It may have a general function. Further, the control may be executed in cooperation with the surrounding eNB or core network node. The memory 822 includes a RAM and a ROM, and stores a program executed by the controller 821 and various control data (for example, a terminal list, transmission power data, scheduling data, etc.).
[0197]
　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.
[0198]
　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.
[0199]
　The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 30, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. The wireless communication interface 825 may include a plurality of RF circuits 827 as shown in FIG. 30, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. Although FIG. 30 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.
[0200]
　In the eNB 800 illustrated in FIG. 30, one or more components (setting unit 151 and/or communication processing unit 153) included in the control unit 150 described with reference to FIG. 15 are installed in the wireless communication interface 825. Good. Alternatively, at least some of these components may be implemented in controller 821. As an example, the eNB 800 includes a module including a part (eg, the BB processor 826) or all of the wireless communication interface 825 and/or the controller 821, and the one or more components may be mounted in the module. Good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), You may run the program. As another example, a program for causing a processor to function as one or more components described above is installed in the eNB 800, and the wireless communication interface 825 (for example, the BB processor 826) and/or the controller 821 executes the program. Good. As described above, the eNB 800, the base station device 820, or the module may be provided as a device including the one or more components, and a program for causing a processor to function as the one or more components is provided. May be. A readable recording medium recording the above program may be provided.
[0201]
　Further, in the eNB 800 illustrated in FIG. 30, the wireless communication unit 120 described with reference to FIG. 15 may be mounted in the wireless communication interface 825 (for example, the RF circuit 827). The antenna unit 110 may be mounted on the antenna 810. Further, the network communication unit 130 may be implemented in the controller 821 and/or the network interface 823. The storage unit 140 may be implemented in the memory 822.
[0202]
　　　(Second Application Example)
　FIG. 31 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.
[0203]
　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 may include a plurality of antennas 840 as illustrated in FIG. 31, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, for example. Note that FIG. 31 shows an example in which the eNB 830 has a plurality of antennas 840, but the eNB 830 may have a single antenna 840.
[0204]
　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.
[0205]
　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. 30 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. 31, and the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. Although FIG. 31 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.
[0206]
　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.
[0207]
　The RRH 860 also includes a connection interface 861 and a wireless communication interface 863.
[0208]
　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.
[0209]
　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. 31, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements. Note that although FIG. 31 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.
[0210]
　In the eNB 830 illustrated in FIG. 31, one or more components (the setting unit 151 and/or the communication processing unit 153) included in the control unit 150 described with reference to FIG. 15 are the wireless communication interface 855 and/or the wireless communication interface 855. It may be implemented in the communication interface 863. Alternatively, at least some of these components may be implemented in controller 851. As an example, the eNB 830 includes a module including a part (eg, the BB processor 856) or all of the wireless communication interface 855 and/or the controller 851, and the one or more components described above may be mounted in the module. Good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), You may run the program. As another example, even if a program for causing the processor to function as one or more components described above is installed in the eNB 830 and the wireless communication interface 855 (for example, the BB processor 856) and/or the controller 851 executes the program. Good. As described above, the eNB 830, the base station device 850, or the module may be provided as a device including the one or more components, and a program for causing a processor to function as the one or more components is provided. May be. A readable recording medium recording the above program may be provided.
[0211]
　Further, in the eNB 830 illustrated in FIG. 31, for example, the wireless communication unit 120 described with reference to FIG. 15 may be implemented in the wireless communication interface 863 (for example, the RF circuit 864). Further, the antenna unit 110 may be mounted on the antenna 840. Further, the network communication unit 130 may be implemented in the controller 851 and/or the network interface 853. The storage unit 140 may be implemented in the memory 852.
[0212]
　　<4.2. Application Example Regarding Terminal Device>
　　　(First Application Example)
　FIG. 32 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.
[0213]
　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.
[0214]
　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.
[0215]
　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 performs various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal through the antenna 916. The wireless communication interface 912 may be a one-chip module in which the BB processor 913 and the RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as shown in FIG. Although FIG. 32 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. However
[0216]
　Furthermore, 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, a BB processor 913 and an RF circuit 914 for each wireless communication system may be included.
[0217]
　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.
[0218]
　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. Although FIG. 32 shows an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0219]
　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.
[0220]
　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. 32 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.
[0221]
　In the smartphone 900 shown in FIG. 32, one or more components (setting unit 241 and/or communication processing unit 243) included in the control unit 240 described with reference to FIG. 16 are implemented in the wireless communication interface 912. May be. Alternatively, at least some of these components may be implemented in processor 901 or auxiliary controller 919. As an example, the smartphone 900 includes a module including a part (eg, the BB processor 913) or all of the wireless communication interface 912, the processor 901, and/or the auxiliary controller 919, and the one or more components in the module. May be implemented. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), You may run the program. As another example, a program for causing a processor to function as the one or more components is installed in the smartphone 900, and the wireless communication interface 912 (for example, the BB processor 913), the processor 901, and/or the auxiliary controller 919 is included in the program. You may run the program. As described above, the smartphone 900 or the module may be provided as the device including the one or more constituent elements, and the program for causing the processor to function as the one or more constituent elements may be provided. A readable recording medium recording the above program may be provided.
[0222]
　Further, in the smartphone 900 shown in FIG. 32, for example, the wireless communication unit 220 described with reference to FIG. 16 may be mounted in the wireless communication interface 912 (for example, the RF circuit 914). The antenna unit 210 may be mounted on the antenna 916. The storage unit 230 may be implemented in the memory 902.
[0223]
　　　(Second Application Example)
　FIG. 33 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.
[0224]
　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.
[0225]
　The GPS module 924 measures the position (eg, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites. The sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor, for example. The data interface 926 is connected to the in-vehicle network 941 via a terminal (not shown), and acquires data generated on the vehicle side such as vehicle speed data.
[0226]
　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.
[0227]
　The wireless communication interface 933 supports a cellular communication scheme 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. Although FIG. 33 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.
[0228]
　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.
[0229]
　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).
[0230]
　Each of the antennas 937 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the radio communication interface 933. The car navigation device 920 may have a plurality of antennas 937 as shown in FIG. Although FIG. 33 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.
[0231]
　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.
[0232]
　The battery 938 supplies electric power to each block of the car navigation device 920 shown in FIG. 33 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.
[0233]
　In the car navigation device 920 shown in FIG. 33, one or more components (setting unit 241 and/or communication processing unit 243) included in the control unit 240 described with reference to FIG. May be implemented. Alternatively, at least some of these components may be implemented in processor 921. As an example, the car navigation device 920 includes a module including a part (for example, the BB processor 934) or all of the wireless communication interface 933 and/or the processor 921, and the one or more components described above are mounted in the module. May be. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), You may run the program. As another example, a program for causing the processor to function as the one or more components is installed in the car navigation device 920, and the wireless communication interface 933 (eg, BB processor 934) and/or the processor 921 executes the program. You may. As described above, the car navigation device 920 or the module may be provided as the device including the one or more constituent elements, and the program for causing the processor to function as the one or more constituent elements may be provided. Good. A readable recording medium recording the above program may be provided.
[0234]
　Further, in the car navigation device 920 shown in FIG. 33, for example, the wireless communication unit 220 described with reference to FIG. 16 may be mounted in the wireless communication interface 933 (for example, the RF circuit 935). The antenna unit 210 may be mounted on the antenna 937. Further, the storage unit 230 may be implemented in the memory 922.
[0235]
　Further, the technology according to the present disclosure may be implemented as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.
[0236]
　<<5. Conclusion>> The
　embodiment of the present disclosure has been described above in detail with reference to FIGS. 1 to 33. As described above, the base station 100 according to the present embodiment communicates with the terminal device 200 using the TDD scheme and is periodically arranged in each of a plurality of bandwidth parts included in the component carrier. The setting information indicating the first resource to be used for transmitting the control signal is transmitted to the terminal device 200. Further, the terminal device 200 according to the present embodiment communicates with the base station using the TDD method, and transmits the uplink control signal based on the setting information. In NR, the subcarrier spacing and the number of slots per radio frame may be different for each bandwidth part. In this respect, in the present embodiment, the first resource is periodically arranged for each bandwidth portion, and the terminal device 200 is notified of information indicating the arrangement as the setting information. Therefore, the terminal device 200 can periodically transmit the uplink control signal to the base station 100 according to the subcarrier interval and the number of slots per radio frame based on the setting information. In this way, periodic transmission and reception of UL control signals in NR are appropriately realized.
[0237]
　Moreover, according to the present embodiment, as compared with aperiodic transmission, a request for transmission of an uplink control signal is unnecessary, and therefore it is possible to efficiently transmit an uplink control signal. Further, even when the transmission of the uplink control signal in the first resource is impossible, the terminal device 200 can transmit the uplink control signal using the alternative resource. Therefore, the communication is less likely to be interrupted in the middle due to the inhibition of the periodic transmission of the uplink control signal. For example, the base station 100 can continuously perform beam tracking. Therefore, the present technology can improve the system throughput. In addition, in a use case where low delay and high reliability are required, the present technology can contribute to ensuring low delay and high reliability.
[0238]
　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 come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that the invention also belongs to the technical scope of the present disclosure.
[0239]
　For example, in the above embodiment, the SRS is described as an example of the UL control signal periodically transmitted from the terminal device 200 to the base station 100, but the present technology is not limited to such an example. For example, the present technology may be applied to PUCCH (Physical Downlink Control Channel). In 5G, PUCCH is transmitted with specific OFDM symbols in specific slots. That is, when the link direction of the specific OFDM symbol in the specific slot is not UL, the terminal device 200 cannot transmit the PUCCH. Therefore, when the base station 100 sets the terminal device 200 to periodically transmit the PUCCH, the same problem as the above-described periodic transmission of the SRS occurs with respect to the periodic transmission of the PUCCH.
[0240]
　Therefore, the base station 100 may transmit to the terminal device 200 a quasi-static configuration that specifies the first resource to be used for transmitting the PUCCH. In that case, the terminal device 200 periodically transmits the PUCCH based on the configuration. Of course, when the PUCCH in the first resource cannot be transmitted, the terminal device 200 may skip, or skip and transmit the PUCCH in an alternative slot.
[0241]
　Furthermore, the base station 100 may transmit to the terminal device 200 a dynamic configuration including information designating the second resource to be used for transmitting the PUCCH instead of the first resource. In that case, the terminal device 200 transmits PUCCH using the 2nd resource set by the dynamic configuration instead of the 1st resource.
[0242]
　Further, the processes described by using the flowcharts and the sequence diagrams in this specification do not necessarily have to be executed in the illustrated order. Some processing steps may be performed in parallel. In addition, additional processing steps may be adopted, and some processing steps may be omitted.
[0243]
　Further, the effects described in the present specification are merely illustrative or exemplary, and are not limitative. That is, the technology 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.
[0244]
　The following configurations also belong to the technical scope of the present disclosure.
(1)
　A terminal device that communicates with a base station using a TDD (Time Division Duplex) system, and
　transmits an uplink control signal periodically arranged in each of a plurality of bandwidth parts included in a component carrier. A
terminal unit , comprising: a control unit that transmits the uplink control signal based on setting information indicating a first resource to be used for .
(2) The
　setting information is information indicating a radio frame in which the first resource is arranged and information indicating a slot in which the first resource is arranged in the radio frame in each of the plurality of bandwidth portions. The terminal device according to (1) above, including.
(3)
　The first resource is arranged in a cycle that is an integer multiple of the number of slots per radio frame according to a subcarrier interval of the bandwidth part, and the
　setting information includes information indicating the cycle. The terminal device according to (2).
(4)
　The terminal device according to (2) or (3), wherein the setting information includes information indicating a table indicating which of a plurality of slots included in a radio frame is the first resource.
(5)
　The first resource is arranged in slots of a predetermined number of slots in a radio frame,
　The terminal device according to (2), wherein the setting information includes information indicating the cycle.
(6)
　The terminal device according to (5), wherein the control unit skips transmission of the uplink control signal in the first resource when the uplink control signal cannot be transmitted in the first resource. ..
(7)
　When the control unit skips transmission of the uplink control signal, the control unit transmits the uplink control signal in a resource that can transmit the uplink control signal after the skipped first resource. The terminal device according to (6) above.
(8) The
　control unit may transmit the uplink control signal after the last skipped first resource when the number of times the transmission of the uplink control signal is skipped reaches a predetermined upper limit value. The terminal device according to (6), wherein the uplink control signal is transmitted in another resource.
(9)
　When the control unit skips the transmission of the uplink control signal, the resource after the skipped first resource is switched to the transmission of the uplink control signal by the downlink control signal. In the terminal device according to (6), the uplink control signal is transmitted.
(10)
　The terminal device according to (5), wherein the number of slots for determining the arrival of the cycle of the first resource is counted for slots in which the uplink control signal can be transmitted. ..
(11)
　The terminal device according to (10), wherein the setting information includes information indicating an upper limit value of the number of the first resources per radio frame.
(12)
　The slot to be counted for determining the arrival of the cycle of the first resource includes a slot switched to enable transmission of the uplink control signal by a downlink control signal, and The terminal device according to (10) or (11), which does not include a slot in which transmission of the uplink control signal is disabled.
(13) The
　control unit sets a slot in which the number of consecutive symbols capable of uplink communication per slot is equal to or more than the number of symbols required to transmit the uplink control signal to the uplink control signal. The terminal device according to any one of (1) to (12), which is recognized as a transmittable slot.
(14) The
　control unit controls transmission of the uplink control signal according to the switching, when transmission permission/prohibition of the uplink control signal in the first resource is switched by a downlink control signal. The terminal device according to any one of (1) to (13).
(15) The
　control unit transmits the uplink control signal in the first resource when the transmission of the uplink control signal is enabled by the switching, and transmits the uplink control signal by the switching. The terminal device according to (14), wherein transmission of the uplink control signal in the first resource is skipped when it becomes impossible.
(16)
　The control unit transmits the uplink control signal in a second resource configured to transmit the uplink control signal instead of the first resource by the downlink control signal, (15) ) The terminal device described in.
(17)
　A base station that communicates with a terminal device using the TDD scheme, which
　is periodically arranged in each of a plurality of bandwidth parts included in a component carrier and which should be used for transmitting an uplink control signal. A
base station , comprising: a control unit that transmits setting information indicating the resource No. 1 to the terminal device .
(18) The
　control unit transmits downlink control information including information for setting a second resource to be used for transmission of the uplink control signal instead of the first resource, to the terminal device, The base station according to (17).
(19) A
　method executed by a terminal device that communicates with a base station using the TDD scheme, wherein
　uplink control signals are periodically arranged in each of a plurality of bandwidth parts included in a component carrier. Transmitting the uplink control signal based on configuration information indicating a first resource to be used for
.
(20) A
　method executed by a base station communicating with a terminal device using the TDD method,
　It, periodically transmitted are arranged in each of the plurality of bandwidths portion included in the component carrier, the first setting information indicating a resource to be used for transmitting the uplink control signal to the terminal device
method comprising ..
(21)
　the computer,
　communicates with the base station using a TDD scheme, is periodically arranged in each of the plurality of bandwidths portion included in the component carrier, the first to be used for transmitting the uplink control signal
A recording medium having a program recorded thereon to function as a control unit that transmits the uplink control signal based on setting information indicating a resource .
(22)
　the computer,
　communicates with the terminal device using the TDD scheme, is periodically arranged in each of the plurality of bandwidths portion included in the component carrier, the first to be used for transmitting the uplink control signal
A recording medium in which a program for causing a control unit to transmit setting information indicating a resource to the terminal device is recorded.
Explanation of symbols
[0245]
　1 system
　11 cell
　20 core network
　30 PDN
　100 base station
　110 antenna unit
　120 wireless communication unit
　130 network communication unit
　140 storage unit
　150 control unit
　151 setting unit
　153 communication processing unit
　200 terminal device
　210 antenna unit
　220 wireless communication unit
　230 storage unit
　240 Control unit
　241 Setting unit
　243 Communication processing unit
claims
[Claim 1]
　A terminal device that communicates with a base station using a TDD (Time Division Duplex) method, and
　is used for transmitting an uplink control signal, which is periodically arranged in each of a plurality of bandwidth parts included in a component carrier. A
terminal device , comprising: a control unit that transmits the uplink control signal based on setting information indicating a first resource to be transmitted .
[Claim 2]
　The setting information includes information indicating a radio frame in which the first resource is arranged, and information indicating a slot in which the first resource is arranged in the radio frame, in each of the plurality of bandwidth portions. The terminal device according to claim 1.
[Claim 3]
　The said 1st resource is arrange|positioned by the period of the integer multiple of the number of slots per radio|wireless frame according to the subcarrier space|interval of the said bandwidth part, The
　said setting information contains the information which shows the said period. The terminal device described.
[Claim 4]
　The terminal device according to claim 2, wherein the setting information includes information indicating a table indicating which of a plurality of slots included in a radio frame is the first resource.
[Claim 5]

　The terminal device according to claim 2, 　wherein the first resource is arranged in a slot having a cycle of a predetermined number of slots in a radio frame, and the setting information includes information indicating the cycle.
[Claim 6]
　The terminal device according to claim 5, wherein the control unit skips transmission of the uplink control signal in the first resource when the uplink control signal cannot be transmitted in the first resource.
[Claim 7]
　When the control unit skips transmission of the uplink control signal, the control unit transmits the uplink control signal in a resource that can transmit the uplink control signal after the skipped first resource, Item 7. The terminal device according to item 6.
[Claim 8]
　When the number of times the transmission of the uplink control signal is skipped reaches a predetermined upper limit value, the control unit is a resource capable of transmitting the uplink control signal after the first resource that is skipped last. The terminal device according to claim 6, which transmits the uplink control signal.
[Claim 9]
　When the control unit skips the transmission of the uplink control signal, in the resource after the skipped first resource, which is switched to enable transmission of the uplink control signal by the downlink control signal, The terminal device according to claim 6, which transmits an uplink control signal.
[Claim 10]
　The terminal device according to claim 5, wherein the counting of the number of slots for determining the arrival of the cycle of the first resource is performed for a slot in which the uplink control signal can be transmitted.
[Claim 11]
　The terminal device according to claim 10, wherein the setting information includes information indicating an upper limit value of the number of the first resources per radio frame.
[Claim 12]
　The slot to be counted for determining the arrival of the cycle of the first resource includes a slot switched to enable transmission of the uplink control signal by a downlink control signal, and the uplink by the downlink control signal. The terminal device according to claim 10, which does not include a slot in which transmission of a control signal is disabled.
[Claim 13]
　The control unit can transmit the uplink control signal in a slot in which the number of consecutive symbols capable of uplink communication per slot is equal to or more than the number of symbols required for transmitting the uplink control signal. The terminal device according to claim 1, which is recognized as a slot.
[Claim 14]
　The control unit controls the transmission of the uplink control signal according to the switching, when the transmission propriety of the uplink control signal in the first resource is switched by a downlink control signal. The terminal device described.
[Claim 15]
　The control unit transmits the uplink control signal in the first resource when the switching enables the transmission of the uplink control signal, and the switching prevents transmission of the uplink control signal. 15. The terminal device according to claim 14, wherein transmission of the uplink control signal in the first resource is skipped when it becomes.
[Claim 16]
　The control unit transmits the uplink control signal in a second resource configured to transmit the uplink control signal instead of the first resource according to the downlink control signal. Terminal device according to.
[Claim 17]
　A base station that communicates with a terminal device using the TDD scheme, and
　is periodically arranged in each of a plurality of bandwidth parts included in a component carrier, and is a first resource to be used for transmitting an uplink control signal. A
base station including a control unit that transmits setting information indicating the above to the terminal device .
[Claim 18]
　The control unit transmits downlink control information including information for setting a second resource to be used for transmitting the uplink control signal instead of the first resource, to the terminal device. The listed base station.
[Claim 19]
　A method performed by a terminal device that communicates with a base station using a TDD scheme, which
　is used for transmitting an uplink control signal, which is periodically arranged in each of a plurality of bandwidth parts included in a component carrier. Transmitting the uplink control signal based on configuration information indicating a first resource to be
used.
[Claim 20]
　A method performed by a base station that communicates with a terminal device using a TDD scheme, and
　is used for transmitting an uplink control signal, which is periodically arranged in each of a plurality of bandwidth parts included in a component carrier. Transmitting configuration information indicating a first resource to be transmitted to the terminal device
.
[Claim 21]
　A computer is
　used to communicate with a base station using a TDD scheme, and indicates a first resource to be used for transmitting an uplink control signal, which is periodically arranged in each of a plurality of bandwidth parts included in a component carrier.
A recording medium having a program recorded thereon to function as a control unit that transmits the uplink control signal based on setting information .
[Claim 22]
　The computer
　communicates with the terminal device using the TDD scheme, and indicates a first resource to be used for transmitting an uplink control signal, which is periodically arranged in each of a plurality of bandwidth parts included in a component carrier.
A recording medium in which a program for causing a control unit to transmit setting information to the terminal device is recorded.