Terminal device and communication method

Abstract

The present invention: receives a reference signal related to a beam; measures the reception quality on the basis of the received reference signal; determines, when the measured reception quality exceeds a certain threshold, a PSFCH including a beam instruction to be transmitted using a resource corresponding to a resource of the reference signal; and, when the number of a plurality of PSFCHs determined to be transmitted in a certain slot exceeds the number of transmittable PSFCHs, selects and transmits the PSFCH that corresponds to the reference signal having the best reception quality.

Description

Terminal device and communication method

[0001] The present invention relates to a terminal device and a communication method. This application claims priority to Japanese Patent Application No. 2023-190528, filed on November 8, 2023, the contents of which are incorporated herein by reference.

[0002] Radio access methods and wireless networks for cellular mobile communications are being studied by the 3rd Generation Partnership Project (3GPP, registered trademark). 3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as a 5G communication method. NR is expected to meet the requirements of three scenarios: enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) within a single technology framework.

[0003] NR supports sidelink technology, which allows terminal devices to communicate directly with each other without going through a base station. Improvements are also being considered for the high-frequency band FR2 (Frequency Range 2) (Non-Patent Document 1).

[0004] "WID revision: NR sidelink evolution", RP-230077, OPPO, 3GPPTSG RAN Meeting #99, March 20-23, 2023

[0005] To improve sidelink operations in FR2, support for beam management is being considered. Support for initial beam pairing, beam maintenance, beam failure recovery, etc. is being considered. For beam management, exchange of beam-related information between terminal devices is being considered. One aspect of the present invention provides a terminal device capable of efficiently exchanging information between terminal devices, and a communication method used in the terminal device.

[0006] (1) A first aspect of the present invention is a terminal device comprising a processor and a memory for storing computer program code, which performs operations including receiving a reference signal related to a beam, measuring reception quality based on the received reference signal, determining to transmit a PSFCH including a beam instruction on a resource corresponding to a resource of the reference signal if the measured reception quality exceeds a certain threshold, and selecting and transmitting the PSFCH corresponding to the reference signal with the best reception quality if the number of PSFCHs determined to be transmitted in a certain slot exceeds the number of PSFCHs that can be transmitted.

[0007] (2) Furthermore, when a PSFCH including HARQ-ACK information is also generated in the slot, and the sum of the multiple PSFCHs including beam instructions and the one or more PSFCHs including HARQ-ACK information exceeds the number of PSFCHs that can be transmitted, the PSFCH corresponding to the reference signal with the best reception quality is selected and transmitted.

[0008] (3) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of receiving a reference signal related to a beam, measuring reception quality based on the received reference signal, determining to transmit a PSFCH including a beam instruction on a resource corresponding to a resource of the reference signal if the measured reception quality exceeds a certain threshold, and selecting and transmitting the PSFCH corresponding to the reference signal with the best reception quality if the number of PSFCHs determined to be transmitted in a certain slot exceeds the number of PSFCHs that can be transmitted.

[0009] According to one aspect of the present invention, information can be efficiently exchanged between terminal devices in a side link.

[0010] Fig. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. Fig. 2 is a schematic diagram showing an example of a resource grid in a subframe according to one aspect of the present embodiment. Fig. 3 is a schematic block diagram showing a configuration of a terminal device 1 according to one aspect of the present embodiment. Fig. 4 is a schematic block diagram showing a configuration of a base station device 3 according to one aspect of the present embodiment. Fig. 5 is a diagram showing processing related to PSFCH transmission according to one aspect of the present embodiment.

[0011] The present embodiment will be described below.

[0012] "A and / or B" may be a term that includes "A", "B", or "A and B".

[0013] The parameter or information indicating one or more values ​​may mean that the parameter or information includes at least a parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE) including multiple parameters.

[0014] Fig. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In Fig. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3 (gNB). Hereinafter, the terminal devices 1A to 1D are also referred to as terminal devices 1 (UE).

[0015] The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG is a group of serving cells including at least a PCell (Primary Cell). The SCG is a group of serving cells including at least a PSCell (Primary Secondary Cell). The PCell is a cell on which an initial connection establishment procedure or a connection re-establishment procedure is performed by the terminal device 1 (the cell on which the procedure has been performed). The PSCell is a serving cell on which a random access procedure is performed by the terminal device 1. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. The serving cell identity is a short identifier for identifying a serving cell. The serving cell identity may be provided by a higher layer parameter.

[0016] A serving cell group (cell group) is a general term for an MCG, an SCG, and a PUCCH cell group. A serving cell group may include one or more serving cells (or component carriers). One or more serving cells (or component carriers) included in a serving cell group may be operated by carrier aggregation.

[0017] The base station device 3 may communicate with the terminal device 1 using different frequency bands (carrier frequencies, frequency spectrums). This operation (multi-carrier operation) is called, for example, carrier aggregation or dual connectivity. Different cells (serving cells) use different frequency bands. With regard to multiple cells used in carrier aggregation between the base station device 3 and the terminal device 1, one cell may use a downlink frequency band and an uplink frequency band, and other cells may use only a downlink frequency band, or the other cells may also use a downlink frequency band and an uplink frequency band. The terminal device 1 makes an initial connection with the base station device 3, and after the connection with the base station device 3 is established, multiple cell connections are added. A frequency band used for communication is added to the terminal device 1. A cell (serving cell) used for communication is added to the terminal device 1. A connection with the base station device 3 is added to the terminal device 1.

[0018] Terminal device 1A and terminal device 1B communicate directly using side link technology. Terminal device 1A and terminal device 1B are located within the coverage of base station device 3 (in-coverage). Terminal device 1A and terminal device 1C communicate directly using side link technology. Terminal device 1C and terminal device 1D communicate directly using side link technology. Terminal device 1C and terminal device 1D are located outside the coverage of base station device 3 (out-of-coverage). There are three cases: direct communication between in-coverage terminal devices 1, direct communication between in-coverage terminal device 1 and out-of-coverage terminal device 1, and direct communication between out-of-coverage terminal devices 1.

[0019] In a wireless communication system, the terminal device 1 and the base station device 3 may use one or more communication methods. For example, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) may be used in the downlink of the wireless communication system. Furthermore, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which modified precoding is applied prior to signal generation in CP-OFDM. Here, modified precoding is also referred to as DFT precoding.

[0020] CP-OFDM may be used for the side link between the terminal devices 1. Furthermore, DFT-s-OFDM may be used for the side link between the terminal devices 1.

[0021] As shown in Fig. 1, the base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, transceiver point). On the other hand, in some cases, the base station device 3 may be configured to include multiple transceivers. When the base station device 3 is configured with multiple transceivers, each of the multiple transceivers may be located in a different geographical location.

[0022] The subcarrier spacing (SCS: SubCarrier Spacing) Δf for a certain subcarrier spacing setting μ is Δf = 2 μ For example, the subcarrier spacing setting μ may indicate any of 0, 1, 2, 3, and 4.

[0023] Time unit T ｃ = 1 / (Δf ｍａｘ ×N ｆ ) may be used to represent the length in the time domain, where Δf ｍａｘ= 480 kHz. ｆ = 4096. The constant κ may be κ = Δf ｍａｘ ×N ｆ / (Δf ｒｅｆ N ｆ，ｒｅｆ ) may be 64. ｒｅｆ may be 15 kHz. ｆ，ｒｅｆ is 2048.

[0024] The transmission of downlink / uplink signals may be organized into radio frames (system frames, frames) of length Tf, where Tf = (Δfmax × Nf / 100) × Ts = 10 ms.

[0025] The transmission of sidelink signals may be organized in radio frames (system frames, frames) of length Tf, where Tf = (Δfmax × Nf / 100) × Ts = 10 ms.

[0026] A radio frame may include 10 subframes, where the length of the subframes, Tsf, may be (Δfmax×Nf / 1000)×Ts=1 ms, and the number of OFDM symbols per subframe, may be Nsubframe,μsymb=Nslotsymb×Nsubframe,μslot.

[0027] An OFDM symbol is used as a time domain unit of a communication scheme used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit of CP-OFDM. Also, an OFDM symbol may be used as a time domain unit of DFT-s-OFDM.

[0028] A slot may be configured to include multiple OFDM symbols. For example, one slot may be configured by Nslotsymb consecutive OFDM symbols. For example, in a normal CP setting, Nslotsymb=14 may be used. Also, in an extended CP setting, Nslotsymb=12 may be used.

[0029] The slots may be indexed in the time domain. For example, the slot index nμs may be given in ascending order as integer values ​​ranging from 0 to Nsubframe,μslot−1 in subframes. Also, the slot index nμs,f may be given in ascending order as integer values ​​ranging from 0 to Nframe,μslot−1 in radio frames.

[0030] Fig. 2 is a diagram showing an example of the configuration of a resource grid according to one aspect of this embodiment. In the resource grid of Fig. 2, the horizontal axis represents the OFDM symbol index lsym, and the vertical axis represents the subcarrier index ksc. The resource grid of Fig. 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS-specific carrier. The values ​​of Nsize, μgrid, and x are expressed in resource blocks.

[0031] Within the resource grid, a resource identified by a subcarrier index ksc and an OFDM symbol index lsym is also called a resource element (RE).

[0032] A resource block (RB) includes NRBsc consecutive subcarriers. The resource block is a collective term for a common resource block, a physical resource block (PRB), and a virtual resource block (VRB). For example, NRBsc may be 12.

[0033] A Bandwidth Part (BWP) may be configured as a subset of the resource grid. Here, the BWP configured for the downlink is also referred to as a downlink BWP. The BWP configured for the uplink is also referred to as an uplink BWP.

[0034] The BWP configured for the sidelink is also called the sidelink BWP.

[0035] Carrier aggregation may be performing communication using a plurality of aggregated serving cells. Also, carrier aggregation may be performing communication using a plurality of aggregated component carriers. Also, carrier aggregation may be performing communication using a plurality of aggregated downlink component carriers. Also, carrier aggregation may be performing communication using a plurality of aggregated uplink component carriers.

[0036] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

[0037] 3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a radio transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 includes at least an antenna unit 11, an RF (Radio Frequency) unit 12, and part or all of a baseband unit 13. The upper layer processing unit 14 includes at least a medium access control layer processing unit 15 and part or all of a radio resource control layer processing unit 16. The radio transmission / reception unit 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0038] The wireless transmission / reception unit 10 performs physical layer processing.

[0039] For example, the radio transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block delivered from a higher layer on the UL-SCH may be mapped to the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

[0040] For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical channel. Here, a transport block of the information transmitted by the downlink physical channel may be delivered to a higher layer on a DL-SCH. For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical signal.

[0041] For example, the radio transceiver unit 10 may generate a baseband signal of a sidelink physical channel. For example, the radio transceiver unit 10 may generate a baseband signal of a sidelink physical signal. For example, the radio transceiver unit 10 may attempt to detect information transmitted by the sidelink physical channel. For example, the radio transceiver unit 10 may attempt to detect information transmitted by the sidelink physical signal.

[0042] The receiving unit of the terminal device 1 receives the PDCCH. The receiving processing unit of the terminal device 1 performs processing to receive the PDCCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH. The receiving processing unit of the terminal device 1 performs processing to receive the PDCCH and to detect downlink control information.

[0043] A receiving unit of the terminal device 1 receives the PDSCH. A receiving processing unit of the terminal device 1 performs processing to receive the PDSCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDSCH.

[0044] The receiving unit of the terminal device 1 receives the PSCCH. The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PSCCH. The receiving processing unit of the terminal device 1 performs processing to receive the PSCCH and detect sidelink control information. The receiving unit of the terminal device 1 determines the frequency resources constituting the PSCCH. The receiving unit of the terminal device 1 determines the OFDM symbols in which the PSCCH can be allocated. The receiving unit of the terminal device 1 blind decodes the PSCCH. The receiving unit of the terminal device 1 blind decodes the PSCCH in one slot in one resource pool. The receiving unit of the terminal device 1 receives the PSSCH. The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PSSCH. The receiving unit of the terminal device 1 receives the PSFCH. The receiving processing unit of the terminal device 1 receives HARQ-ACK information via the PSFCH. The receiving processing unit of the terminal device 1 receives collision information via the PSFCH. The receiving processing unit of the terminal device 1 receives sidelink beam-related information via the PSFCH.

[0045] The receiving unit of the terminal device 1 measures reception quality. For example, the receiving unit of the terminal device 1 measures reception quality based on CSI-RS. For example, the receiving unit of the terminal device 1 measures reception quality based on sidelink SSB. For example, the reception quality is RSRP.

[0046] A transmitter (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK in an uplink frequency band (cell, component carrier, carrier).

[0047] The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for the PSSCH. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK in the sidelink frequency band. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK on the PSFCH. The transmission processing unit of the terminal device 1 may transmit a HARQ-ACK on the PSSCH. The transmission processing unit of the terminal device 1 may not transmit a HARQ-ACK for the PSSCH. The transmission processing unit of the terminal device 1 transmits collision information on the PSFCH. The transmission processing unit of the terminal device 1 transmits sidelink beam related information on the PSFCH.

[0048] The transmission processing unit of the terminal device 1 transmits the PSCCH. The transmission processing unit of the terminal device 1 performs processing such as encoding and modulation on the PSCCH. The transmission processing unit of the terminal device 1 transmits the side link control information (1 st The transmission processing unit of the terminal device 1 performs processing to transmit side link control information (2 stage SCI) using the PSCCH. The transmission unit of the terminal device 1 determines frequency resources constituting the PSCCH. The transmission processing unit of the terminal device 1 determines OFDM symbols in which the PSCCH can be placed. The transmission processing unit of the terminal device 1 transmits the PSSCH. The transmission processing unit of the terminal device 1 performs processing such as coding and modulation on the PSSCH. The transmission processing unit of the terminal device 1 performs processing such as coding and modulation on the PSSCH. nd The PSSCH is used to transmit MAC CE and other information.

[0049] The radio transceiver 10 of the terminal device 1 performs a process for reporting sidelink beam-related information. For example, the sidelink beam-related information is information consisting of one or more of a beam indication, L1-RSRP (reference signal received power), and L1-SINR (signal-to-noise and interference ratio). The beam indication may be an index CRI (CSI-RS indicator) indicating a CSI-RS. For example, L1-RSRP is a CSI-RS-based RSRP (CSI-RSRP) that is a linear average of the power contributions of multiple resource elements carrying the CSI-RS. For example, L1-SINR is a CSI-RS-based SINR (CSI-SINR) that is a value obtained by dividing the linear average of the power contributions of multiple resource elements carrying the CSI-RS by the linear average of the power contributions of noise and interference. The interference and noise may be measured on resources indicated by a higher layer.

[0050] The sidelink beam-related information is transmitted and received using the PSFCH. The PSFCH resources may be implicitly associated with the sidelink beam-related information. For example, the PSFCH resources may be implicitly associated with the beam instruction. For example, the PSFCH resources (time resources, frequency resources, code resources, etc.) may be implicitly associated with the CSI-RS resources (time resources, frequency resources, code resources, etc.), and the terminal device 1 may transmit a signal using the PSFCH resources associated with the CSI-RS resources for which it has been determined that a suitable beam has been used. The terminal device 1 receiving the PSFCH signal may recognize the corresponding CSI-RS from the PSFCH resources from which the signal has been detected, and determine that the beam used for the recognized CSI-RS is a beam suitable for the terminal device 1 transmitting the PSFCH signal. The terminal device 1 may select a CSI-RS whose reception quality is equal to or greater than a predetermined threshold, and determine to transmit a beam instruction corresponding to the selected CSI-RS using the PSFCH. The terminal device 1 may select multiple CSI-RSs whose reception quality is above a predetermined threshold in the beam sweeping section, and may determine to transmit beam instructions corresponding to each selected CSI-RS using different PSFCH resources.

[0051] The upper layer processing unit 14 outputs uplink data (transport blocks) generated by user operations or the like to the radio transceiver unit 10. The upper layer processing unit 14 performs processing of the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0052] The upper layer processing unit 14 outputs the side link data (transport block) to the radio transceiver unit 10.

[0053] A media access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs MAC layer processing.

[0054] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the RRC layer. The radio resource control layer processing unit 16 manages various setting information / parameters (RRC parameters) of its own device. The radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on upper layer signals received from the base station device 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on information indicating the various setting information / parameters (RRC parameters) received from the base station device 3. Note that the setting information may include information related to processing or setting of physical channels and physical signals (i.e., the physical layer), the MAC layer, the PDCP layer, the RLC layer, and the RRC layer. The parameters may be upper layer parameters.

[0055] For example, the radio resource control layer processing unit 16 may acquire RRC parameters included in an RRC message on a certain logical channel and set the acquired RRC parameters in a storage area of ​​the terminal device 1. The RRC parameters set in the storage area of ​​the terminal device 1 may be provided to a lower layer.

[0056] The radio resource control layer processing unit 16 sets a control resource set based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets (configures) a search space within the control resource set. The radio resource control layer processing unit 16 sets (configures) PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets (configures) the number of PDCCH candidates to be monitored within the control resource set. The radio resource control processing unit 16 sets (configures) an aggregation level for the PDCCH candidates to be monitored within the control resource set.

[0057] The radio resource control layer processing unit 16 sets a DCI format to be monitored within a control resource set. The radio resource control layer processing unit 16 may set a DCI format to be monitored within a search space. The radio resource control layer processing unit 16 sets a DCI format to be monitored within a control resource set based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 may set a DCI format to be monitored within a search space based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 sets one or more DCI formats to be monitored in the reception processing unit.

[0058] The radio resource control layer processing unit 16 performs settings related to a plurality of search areas, each of which is indexed.

[0059] The radio resource control layer processing unit 16 performs settings related to CSI feedback (transmission of channel state information) based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets the CSI feedback transmission period, the CSI feedback transmission start timing (offset), the CSI feedback information type, etc. The radio resource control layer processing unit 16 performs settings related to multiple CSI feedbacks. The settings related to multiple CSI feedbacks are each indexed.

[0060] The radio resource control layer processing unit 16 performs settings related to the SPS based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets the period of the SPS resources (PDSCH resources), the start timing (offset) of the SPS resources (PDSCH resources), the number of HARQ processes to be set for the SPS, an offset used to derive the HARQ process ID to be used for the SPS, an RNTI value for scheduling the SPS, etc. The radio resource control layer processing unit 16 performs settings related to multiple SPSs. The settings related to the multiple SPSs are each indexed.

[0061] The radio resource control layer processing unit 16 configures carrier aggregation based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform reception processing using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing using the uplink component carrier configured in the carrier aggregation configuration.

[0062] The radio resource control layer processing unit 16 performs settings related to the side link based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets parameters related to the side link notified from the base station device 3. The parameters related to the side link will be described later. For example, the radio resource control layer processing unit 16 sets OFDM symbols in which the PSCCH can be allocated. For example, the radio resource control layer processing unit 16 sets a band in which the PSCCH is allocated. For example, the radio resource control layer processing unit 16 sets the number of resource blocks constituting one PSCCH. The radio resource control layer processing unit 16 performs settings related to the transmission and reception of the PSCCH in the radio transceiver unit 10. For example, the radio resource control layer processing unit 16 sets slots in which the PSFCH can be transmitted. For example, a slot in which the PSFCH can be transmitted is set every four slots.

[0063] The radio resource control layer processing unit 16 configures resources for the PSFCH used for transmitting and receiving the sidelink beam-associated information. For example, the radio resource control layer processing unit 16 configures resource blocks to be used for the PSFCH used for transmitting and receiving the sidelink beam-associated information. For example, the radio resource control layer processing unit 16 configures slots (at least one of periodicity, offset, granularity, etc.) to be used for the PSFCH used for transmitting and receiving the sidelink beam-associated information.

[0064] The radio resource control device processing unit 16 may set the number of CSI-RSs used in one beam sweeping interval. Here, the number of CSI-RSs refers to the number of CSI-RSs in units for which reception quality measurements are performed. Different beams are applied to different CSI-RSs. The terminal device 1 transmitting CSI-RS applies different beams to different CSI-RSs in the beam sweeping interval for transmission. The terminal device 1 receiving CSI-RS measures the reception quality for each different CSI-RS in the beam sweeping interval and determines the beam and CSI-RS with the best reception quality. The radio resource control device processing unit 16 may set the number of slots in one beam sweeping interval. For example, reception quality is measured for one CSI-RS in one slot.

[0065] The radio resource control layer processing unit 16 sets one or more destination identities for unicast and groupcast communication destinations. Groupcast is communication between multiple terminal devices 1, and multiple destination identities are set.

[0066] The medium access control layer processing unit (MAC layer processing unit) 15 activates / deactivates the secondary cell based on a MAC Control Element (MAC CE) received from the base station device 3. The medium access control layer processing unit (MAC layer processing unit) 15 outputs information indicating activation / deactivation for multiple serving cells configured by the radio resource control layer processing unit 16 to the radio transceiver unit 10 based on a MAC CE (SCell Activation / Deactivation MAC CEs) including information on activation / deactivation of the secondary cell. The medium access control layer processing unit (MAC layer processing unit) 15 deactivates the secondary cell based on a timer. The medium access control layer processing unit (MAC layer processing unit) 15 determines that scheduling has not been performed for the serving cell by the base station device 3 for a certain period of time by measuring with a timer, deactivates the serving cell, and controls the radio transceiver unit 10.

[0067] The medium access control layer processor (MAC layer processor) 15 processes sidelink HARQ operations, sidelink scheduling requests, sidelink buffer status reports, and sidelink CSI reports. Sidelink CSI includes a channel quality indicator (CQI) and a rank indicator (RI).

[0068] The CSI reporting process in the medium access control layer processing unit (MAC layer processing unit) 15 will now be described. The medium access control layer processing unit (MAC layer processing unit) 15 sets a timer (sl-CSI-ReportTimer) to a value indicated in the information indicating the delay time limit for sidelink CSI reporting. When SL-CSI reporting is triggered by the SCI, the medium access control layer processing unit (MAC layer processing unit) 15 starts the sl-CSI-ReportTimer. When the sl-CSI-ReportTimer expires, the medium access control layer processing unit (MAC layer processing unit) 15 cancels the triggered SL-CSI reporting. When the medium access control layer processing unit (MAC layer processing unit) 15 acquires resources for new transmission, it multiplexes a signal including sidelink CSI information onto the resources, stops the sl-CSI-ReportTimer, and cancels the triggered SL-CSI reporting.

[0069] The following describes the processing of sidelink scheduling requests in the medium access control layer processor (MAC layer processor) 15. Sidelink scheduling requests are used to request resources for new transmissions when triggered by a sidelink BSR, a sidelink CSI report, etc. One PUCCH resource is configured for sidelink scheduling requests per uplink BWP. Each sidelink logical channel may be mapped to one scheduling request configuration. A sidelink CSI report is mapped to one scheduling request configuration. The scheduling request configuration specifies the PUCCH frequency resources (resource blocks), time resources (slot period, slot offset), etc. used for the scheduling request.

[0070] The priority value of a scheduling request triggered by a sidelink CSI report may correspond to the priority value of the sidelink CSI reporting MAC CE.

[0071] A pending scheduling request triggered by the sidelink BSR procedure is canceled when a sidelink BSR MAC CE is transmitted. A pending scheduling request triggered by a sidelink CSI report is canceled when a sidelink CSI reporting MAC CE is transmitted. A pending scheduling request triggered by a sidelink CSI report is also canceled if the sidelink CSI report delay bound is not met.

[0072] The radio resource control layer processing unit 16 may include functional information generated based on the functions provided by the terminal device 1 in an RRC message and transmit the information to the base station device 3.

[0073] The wireless transmission / reception unit 10 performs modulation, encoding, and transmission processes. The wireless transmission / reception unit 10 generates a physical signal by encoding data (transport blocks), modulating it, and generating a baseband signal (converting it into a time-continuous signal), and transmits the generated physical signal to the base station device 3 or the terminal device 1.

[0074] The radio transmission / reception unit 10 performs demodulation processing, decoding processing, and reception processing. The radio transmission / reception unit 10 outputs a transport block from the information detected based on the demodulation processing and decoding processing of the received physical signal to the upper layer processing unit 14 on the DL-SCH.

[0075] The radio transceiver unit 10 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 10 stops monitoring the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 10 stops receiving the PDSCH in the deactivated serving cell. For example, the radio transceiver unit 10 stops transmitting the SRS in the deactivated serving cell. For example, the radio transceiver unit 10 stops transmitting the PUSCH in the deactivated serving cell.

[0076] The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal and removes unnecessary frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0077] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to a cyclic prefix (CP) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

[0078] The baseband unit 13 performs an Inverse Fast Fourier Transform (IFFT) on the physical signal to generate an OFDM symbol. The baseband unit 13 adds a CP to the generated OFDM symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0079] The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, and upconverts the analog signal to a carrier frequency to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0080] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0081] 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of the present embodiment. As shown in the figure, the base station device 3 includes a radio transmission / reception unit 30 and a higher layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transmission / reception unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0082] The upper layer processing unit 34 processes the Medium Access Control (MAC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Radio Resource Control (RRC) layer. Here, the MAC layer is also referred to as the MAC sublayer. The PDCP layer is also referred to as the PDCP sublayer. The RLC layer is also referred to as the RLC sublayer. The RRC layer is also referred to as the RRC sublayer.

[0083] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing, which may include part or all of the following: mapping between logical channels and transport channels, multiplexing one or more MAC SDUs (Service Data Units) into transport blocks, disassembling transport blocks delivered from the physical layer on the UL-SCH into one or more MAC SDUs, applying HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and processing of scheduling requests.

[0084] The radio resource control layer processing unit 36 ​​included in the upper layer processing unit 34 performs RRC layer processing. The RRC layer processing may include some or all of broadcast signal management, RRC connection / RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates downlink data (transport blocks) to be allocated to the PDSCH, system information, RRC messages, MAC CEs, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

[0085] The radio resource control layer processing unit 36 ​​also manages various setting information / parameters (RRC parameters) for each terminal device 1. The radio resource control layer processing unit 36 ​​may set various setting information / parameters for each terminal device 1 via higher layer signals. That is, the radio resource control layer processing unit 36 ​​transmits / broadcasts information indicating various setting information / parameters. The setting information may include information related to processing or setting of physical channels and physical signals (i.e., the physical layer), the MAC layer, the PDCP layer, the RLC layer, and the RRC layer. The parameters may be higher layer parameters. For example, the radio resource control layer processing unit 36 ​​may include the RRC parameters in an RRC message on a certain logical channel and transmit the RRC parameters to the terminal device 1. Here, the RRC message may be mapped to any of the BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel).

[0086] The radio resource control layer processing unit 36 ​​may determine RRC parameters to be transmitted to the terminal device 1 based on the RRC parameters included in the RRC message transmitted from the terminal device 1. Here, the RRC message transmitted from the terminal device 1 may be related to a capability information report of the terminal device 1.

[0087] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 ​​sets a search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search space for the terminal device 1.

[0088] The radio resource control layer processing unit 36 ​​sets a DCI format to be applied to the terminal device 1 within the control resource set. The radio resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format to be applied to the terminal device 1. The radio resource control layer processing unit 36 ​​sets one or more DCI formats to be applied in the transmission processing unit.

[0089] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search areas, each of which is indexed.

[0090] The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to the terminal device 1. The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier). The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK for PDSCH in the uplink frequency band (cell, component carrier, carrier).

[0091] The radio resource control layer processing unit 36 ​​performs settings related to CSI feedback (transmission of channel state information) for the terminal device 1. The radio resource control layer processing unit 36 ​​sets the CSI feedback transmission period, the CSI feedback transmission start timing (offset), the CSI feedback information type, etc. The radio resource control layer processing unit 36 ​​performs settings related to multiple CSI feedbacks. The settings related to multiple CSI feedbacks are each indexed.

[0092] The radio resource control layer processing unit 36 ​​performs SPS-related settings for the terminal device 1. The radio resource control layer processing unit 36 ​​sets the period of the SPS resources (PDSCH resources), the start timing (offset) of the SPS resources (PDSCH resources), the number of HARQ processes to be set for the SPS, an offset used to derive the HARQ process ID to be used for the SPS, an RNTI value for SPS scheduling, and the like. The radio resource control layer processing unit 36 ​​performs settings for multiple SPSs. The settings for multiple SPSs are each indexed.

[0093] The radio resource control layer processing unit 36 ​​configures carrier aggregation for the terminal device 1. The radio resource control layer processing unit 36 ​​configures a serving cell (secondary cell, primary secondary cell) as the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 to perform transmission processing for the terminal device 1 using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 to perform reception processing for the terminal device 1 using the uplink component carrier configured in the carrier aggregation configuration.

[0094] The radio resource control layer processing unit 36 ​​performs sidelink-related settings for the terminal device 1. The radio resource control layer processing unit 36 ​​sets parameters related to the sidelink for the terminal device 1 and notifies the terminal device 1 via the radio transceiver unit 30. For example, the following information is used as parameters related to the sidelink: Configuration of the sidelink BWP Configuration of the sidelink radio bearer Configuration of the sidelink measurement

[0095] The information indicating the configuration of the sidelink BWP includes information indicating the starting position of a symbol in a slot used for the sidelink, the length of the symbol, the PSBCH configuration, the configuration of the sidelink resource pool, etc. The information indicating the PSBCH configuration includes information indicating parameters used for PSBCH transmission power control. The information indicating the configuration of the sidelink resource pool includes information indicating the configuration of the sidelink reception resource pool, the configuration of the sidelink transmission resource pool, etc. The configuration of the sidelink transmission resource pool includes the configuration of the transmission resource pool for a method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1, and the configuration of the transmission resource pool for a method (mode 2) in which the terminal device 1 autonomously (automatically) selects resources.

[0096] The information indicating the configuration of the sidelink resource pool includes information indicating the PSCCH configuration, information indicating the PSSCH configuration, information indicating the PSFCH configuration, information indicating the sidelink subchannel size, information indicating the start position of the sidelink subchannel, information indicating the MCS table used in the sidelink, information indicating the sidelink PTRS configuration, information indicating the sidelink TDD UL-DL configuration, information indicating the number of PRBs in the sidelink resource pool, information indicating the time resources of the sidelink resource pool, information indicating parameters of the sidelink transmit power control, information indicating the maximum number of reserved PSCCH / PSSCH resources that can be indicated by one SCI, information indicating the set of reservable resource intervals, information indicating whether the PSCCH or PSSCH DM RS is used for L1 RSRP measurement in the sensing operation, information indicating the start position of the sensing window, information indicating the end position of the sensing window, and information indicating the sidelink synchronization configuration.

[0097] The PSSCH is arranged in the OFDM symbols following the OFDM symbol in which the PSCCH is arranged. For example, the PSSCH is arranged in the second or subsequent OFDM symbols in a slot.

[0098] The information indicating the configuration of the PSCCH includes information indicating the number of symbols in the PSCCH, information indicating the number of RBs that make up the PSCCH, information indicating the initial value (ID) of the scrambling of the DM RS of the PSCCH, and information indicating the number of bits reserved in the first stage SCI.

[0099] The information indicating the configuration of the PSSCH includes information indicating candidates for β offsets used to determine the number of coded modulation symbols of the 2nd stage SCI, information indicating the time domain pattern of the DM RS of the PSSCH, and information indicating a scaling factor for limiting the number of resource elements allocated to the 2nd stage SCI of the PSSCH.

[0100] The information indicating the PSFCH configuration includes information indicating a set of PRBs used for transmitting and receiving the PSFCH, information indicating the number of cyclic shift pairs used for PSFCH transmission that can be multiplexed onto one PRB, information indicating the number of PSFCH resources available for multiplexing HARQ-ACK information, information indicating a scrambling ID for PSFCH sequence hopping, information indicating a PSFCH resource interval, and information indicating a minimum time gap between the PSFCH and the PSFCH. The information indicating the set of PRBs used for transmitting and receiving the PSFCH uses a bitmap, and each bit indicates whether the PRB corresponding to the bit position is included in the set of PRBs used for transmitting and receiving the PSFCH. The information indicating the PSFCH resource interval is information indicating the interval of slots in which the PSFCH resources are allocated. For example, information indicating an interval of one slot, an interval of two slots, or an interval of four slots is used.

[0101] The above PSFCH is a PSFCH used for transmitting and receiving HARQ-ACK information. Information indicating the configuration of the PSFCH used for transmitting and receiving collision information is used separately. The information indicating the configuration of the PSFCH used for transmitting and receiving collision information includes information indicating a set of PRBs used for transmitting and receiving the PSFCH used for transmitting and receiving the collision information, and information indicating a slot in which the PSFCH used for transmitting and receiving the collision information is transmitted and received. Information indicating the configuration of the PSFCH used for transmitting and receiving sidelink beam-related information is used separately. The information indicating the configuration of the PSFCH used for transmitting and receiving the sidelink beam-related information includes information indicating a set of PRBs used for transmitting and receiving the PSFCH used for transmitting and receiving the sidelink beam-related information, and information indicating a slot in which the PSFCH used for transmitting and receiving the sidelink beam-related information is transmitted and received. The information indicating the configuration of the PSFCH used for transmitting and receiving the sidelink beam-related information may include information indicating the number of cyclic shift pairs used for transmitting and receiving the PSFCH used for transmitting and receiving the sidelink beam-related information, which may be multiplexed onto one PRB.

[0102] The information indicating parameters for sidelink transmission power control includes information indicating parameters used for sidelink path loss-based transmission power control and information indicating parameters used for downlink path loss-based transmission power control.

[0103] The information indicating the sidelink synchronization configuration includes information indicating whether the sidelink synchronization configuration is used for transmitting and receiving a sidelink synchronization signal when the terminal device 1 is synchronized to the GNSS (Global Navigation Satellite System) or whether the sidelink synchronization configuration is used for transmitting and receiving a sidelink synchronization signal when the terminal device 1 is synchronized to the base station device 3, information indicating the type of hysteresis when evaluating the terminal device 1 for synchronization reference, information indicating the number of sidelink SSB transmissions within one sidelink SSB (Synchronization Signal Block) interval, information indicating the interval and start position of the sidelink SSB, information indicating the ID of the sidelink synchronization signal, information indicating a threshold used to determine the transmission of a sidelink synchronization signal, etc.

[0104] The information indicating the configuration of the sidelink radio bearer includes information indicating whether the terminal device 1 is the synchronization source, information indicating parameters used to detect a sidelink radio link failure, information indicating the frequency used for the sidelink, information indicating the configuration for a method (mode 1) in which the base station device 3 instructs the terminal device 1 about scheduling information, information indicating the configuration for a method (mode 2) in which the terminal device 1 autonomously selects resources, information indicating whether CSI reporting is used, information indicating the configuration of a sidelink scheduling request, information indicating the priority of transmission and reception of sidelink SSB, information indicating the RLC mode, information indicating the configuration of the sidelink logical channel, information indicating the configuration of the sidelink RLC, etc.

[0105] The information indicating the frequency at which the sidelink is used further includes information indicating the subcarrier spacing, information indicating the frequency position of the sidelink SSB, information indicating the synchronization priority, and the like.

[0106] The information indicating the configuration for the method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1 includes information indicating an RNTI used to scramble the CRC of a DCI format (e.g., DCI format 3_0) including scheduling information for the terminal device 1, information indicating a sidelink MAC configuration, and information indicating a sidelink Configured Grant configuration. The information indicating the sidelink MAC configuration includes information indicating a sidelink BSR configuration and information indicating a threshold used to determine the priority of sidelink transmission and uplink transmission. The information indicating the sidelink Configured Grant configuration includes information indicating an ID for identifying the sidelink Configured Grant, information indicating frequency resources for the sidelink Configured Grant, information indicating time resources for the sidelink Configured Grant, information indicating a HARQ process ID for the sidelink Configured Grant, information indicating resources used for sidelink HARQ-ACK transmission, information indicating the duration of the sidelink Configured Grant, information indicating a resource pool to which the sidelink Configured Grant is applied, and information indicating the start subchannel of the sidelink Configured Grant.

[0107] The information indicating the configuration for the method (mode 2) in which the terminal device 1 autonomously (automatically) selects resources includes information indicating PSSCH transmission parameters such as MCS, subchannel number, number of retransmissions, and transmission power parameters, information indicating the probability used for resource selection, and information indicating a threshold value for RSRP used for resource selection.

[0108] In mode 2, the terminal device 1 selects resources on a slot-by-slot basis, for example. In mode 2, the terminal device 1 reserves resources on a slot-by-slot basis, for example.

[0109] A time interval (resource reservation period) between an initially selected set of resources and a next reserved set of resources is set for each resource pool. The base station device 3 transmits RRC signaling including a parameter indicating this time interval to the terminal device 1. The terminal device 1 receives RRC signaling including a parameter indicating this time interval from the base station device 3. This time interval is also used as the time interval between the reserved resource sets.

[0110] A guard time (also called a gap) is provided at the last time interval of the slot, during which switching between transmission and reception takes place.

[0111] The terminal device 1 recognizes resources (resources of multiple consecutive slots) secured in other terminal devices 1 from information included in the received PSCCH (information of 1st stage SCI), excludes those resources, and selects and reserves resources to be used by the terminal device 1 from resources that have not been recognized as being secured in other terminal devices 1. The terminal device 1 may recognize resources (resources of multiple consecutive slots) secured or reserved in other terminal devices 1 from information of 2nd stage SCI included in the received PSSCH.

[0112] The information indicating the configuration of the sidelink logical channel includes information indicating the sidelink logical channel priority, information indicating the configuration of the scheduling request applicable to the sidelink logical channel, information indicating the bit rate, information indicating the sidelink bucket size interval, information indicating whether HARQ feedback is applied to the sidelink logical channel, information indicating the subcarrier spacing applied to the resource to which the sidelink logical channel is mapped, information indicating the maximum physical channel interval of the resource to which the sidelink logical channel is mapped, information indicating the ID of the sidelink logical channel group, etc.

[0113] The information indicating the configuration of the sidelink measurements includes information indicating the frequency at which the sidelink measurements are performed, information indicating the filter coefficients applied to the sidelink measurements, information indicating the interval at which the sidelink measurement results are reported, information indicating the threshold used to decide whether to report the sidelink measurement results, information indicating the interval used to decide whether to report the sidelink measurement results, etc.

[0114] The sidelink RRC signaling includes information indicating a delay time limit for sidelink CSI reporting, which indicates a limit of the delay time from triggering of sidelink CSI to reporting in slot units.

[0115] The sidelink RRC signaling includes information indicating the configuration of the sidelink CSI-RS. The information indicating the configuration of the sidelink CSI-RS includes information indicating the frequency location of the sidelink CSI-RS and information indicating the initial location of the sidelink CSI-RS within a slot. The information indicating the frequency location of the sidelink CSI-RS indicates the number of antenna ports (one or two) used for sidelink CSI-RS transmission and the subcarrier on which the CSI-RS is allocated for each antenna port.

[0116] The sidelink RRC signaling may include information indicating whether sidelink beam-related information reporting is used.

[0117] The terminal device 1 receives the above-mentioned RRC signaling (RRC parameters). A radio resource control layer processing unit 16 of the terminal device 1 manages information included in the RRC signaling, sets various parameters, and controls the processing of each unit.

[0118] The terminal device 1 notifies the base station device 3 of information related to the sidelink by RRC signaling. The information includes information indicating frequencies at which the terminal device 1 is interested in receiving sidelink communications, information indicating frequencies at which the terminal device 1 is interested in transmitting sidelink communications, information indicating parameters for requesting sidelink transmission resources, information about sidelink capabilities, information indicating a cast type (broadcast, groupcast, unicast) for requesting sidelink resources, information indicating Destination Identity, information about sidelink QoS, information indicating an RLC mode, information indicating a list of synchronization references used by the terminal device 1, and the like.

[0119] The information on sidelink capability includes information indicating the number of PSFCHs that can be simultaneously transmitted and information indicating the number of PSFCHs that can be simultaneously received. For example, the information indicating the number of PSFCHs that can be simultaneously transmitted indicates any one of 4, 8, and 16. For example, the information indicating the number of PSFCHs that can be simultaneously received indicates any one of 5, 15, 25, 32, 35, 45, 50, and 64.

[0120] The radio resource control layer processing unit 36 ​​of the base station device 3 may notify the terminal device 1 of RRC signaling indicating multiple destination identities, taking into account the destination identities requested by the terminal device 1. The terminal device 1 may recognize and set (store) the destination identities of communication peers for sidelink transmission using the resource pool set by the base station device 3.

[0121] The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs (SCell Activation / Deactivation MAC CEs) that instruct activation / deactivation of secondary cells. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs that instruct activation / deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 deactivates secondary cells based on a timer. The medium access control layer processing unit (MAC layer processing unit) 35 determines that scheduling has not been performed for a serving cell for a certain period of time by measuring with the timer, deactivates the serving cell, and controls the radio transceiver unit 30.

[0122] The functions of the radio transceiver unit 30 are similar to those of the radio transceiver unit 10, and therefore description thereof will be omitted where appropriate. The radio transceiver unit 30 performs physical layer processing. Here, the physical layer processing may include some or all of the following: generation of a baseband signal of a physical channel, generation of a baseband signal of a physical signal, detection of information transmitted by the physical channel, and detection of information transmitted by the physical signal. Furthermore, the physical layer processing may include mapping processing of a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0123] The radio transceiver 30 may perform one or both of demodulation and decoding. The radio transceiver 30 may deliver a transport block of information detected based on the demodulation and decoding of a received physical signal to a higher layer on the UL-SCH. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical channel. Here, the transport block delivered from a higher layer on the DL-SCH may be allocated to the downlink physical channel. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical signal.

[0124] The radio transceiver unit 30 may perform some or all of modulation processing, coding processing, and transmission processing. The radio transceiver unit 30 may generate a physical signal based on some or all of coding processing, modulation processing, and baseband signal generation processing for the transport block. The radio transceiver unit 30 may map the physical signal to a BWP. The radio transceiver unit 30 may transmit the generated physical signal. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical channel. Here, the transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on the UL-SCH. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical signal.

[0125] The radio transceiver unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transceiver unit 30 grasps the search space within the control resource set configured in the terminal device 1. The radio transceiver unit 30 grasps the PDCCH candidates monitored in the terminal device 1 to grasp the search space. The radio transceiver unit 30 grasps which control channel elements constitute each PDCCH candidate monitored in the terminal device 1 (grabs the numbers of the control channel elements in which the PDCCH candidate is constituted). The radio transceiver unit 30 includes an SS grasping unit, which grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates in the control resource set configured as the search space of the terminal device. The SS grasping unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search space of the control resource set of the terminal device 1.

[0126] The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transceiver unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidates within the search space of the control resource set.

[0127] A transmitter (also referred to as a transmission processing unit) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search space set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates in a search space where PDCCH monitoring is performed in the terminal device 1, among multiple search spaces set for the terminal device 1.

[0128] The receiving unit (also referred to as the receiving processing unit) of the base station device 3 receives the HARQ-ACK. The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH. The receiving processing unit of the base station device 3 receives the HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3.

[0129] A receiving unit of the base station device 3 receives the sidelink HARQ-ACK from the terminal device 1. The terminal device 1 transmits information about the sidelink HARQ-ACK acquired from the PSFCH received from the terminal device 1, which is the communication partner, via the sidelink, to the base station device 3 using the PUCCH.

[0130] The radio transceiver unit 30 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDSCH in the deactivated serving cell. For example, the radio transceiver unit 30 stops receiving the SRS in the deactivated serving cell. For example, the radio transceiver unit 30 stops receiving the PUSCH in the deactivated serving cell.

[0131] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unnecessary frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0132] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a cyclic prefix (CP) from the digitized baseband signal. The baseband unit 33 may perform a fast Fourier transform (FFT) on the baseband signal from which the CP has been removed to extract a frequency domain signal.

[0133] The baseband unit 33 may generate a baseband signal by performing an Inverse Fast Fourier Transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal to which the CP has been added into an analog signal. The baseband unit 33 may output the analog baseband signal to the RF unit 32.

[0134] The RF unit 32 may remove unnecessary frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may up-convert the baseband signal to a carrier frequency to generate an RF signal. The RF unit 32 may transmit the RF signal via the antenna unit 31. The RF unit 32 may also have a function of controlling transmission power.

[0135] Each of the units designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0136] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described.

[0137] The physical signal is a general term for a downlink physical channel, a downlink physical signal, an uplink physical channel, and an uplink physical channel. The physical channel is a general term for a downlink physical channel and an uplink physical channel. The physical signal is a general term for a downlink physical signal and an uplink physical signal.

[0138] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by the radio transceiver unit 10. An uplink physical channel may be received by the radio transceiver unit 30. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical channels are used: PUCCH (Physical Uplink Control CHannel) PUSCH (Physical Uplink Shared CHannel) PRACH (Physical Random Access CHannel)

[0139] The PUCCH may be used to transmit (transmit) uplink control information (UCI). The uplink control information may be arranged in the PUCCH. The radio transceiver 10 may transmit the PUCCH in which the uplink control information is arranged. The radio transceiver 30 may receive the PUCCH in which the uplink control information is arranged.

[0140] The uplink control information (uplink control information bits, uplink control information sequence, uplink control information type) includes some or all of channel state information (CSI), scheduling request (SR), and hybrid automatic repeat request ACKnowledgement (HARQ-ACK) information. Note that the uplink control information may also include information not described above.

[0141] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0142] The HARQ-ACK information may be configured by HARQ-ACK bits corresponding to one transport block (TB). The HARQ-ACK bits may indicate an acknowledgement (ACK) or a negative acknowledgement (NACK) corresponding to the transport block. The ACK may indicate that the transport block has been decoded successfully. The NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

[0143] The HARQ-ACK for a transport block is also referred to as the HARQ-ACK for a PDSCH. Here, the "HARQ-ACK for a PDSCH" may refer to the HARQ-ACK for a transport block included in the PDSCH.

[0144] The scheduling request may be used to request UL-SCH resources for initial transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that UL-SCH resources for initial transmission are requested by the terminal device 1. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that UL-SCH resources for initial transmission are not requested by the terminal device 1.

[0145] The channel state information may include some or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, the PMI is an indicator related to the precoder, and the RI is an indicator related to the transmission rank (or the number of transmission layers).

[0146] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal used for channel measurement. The channel measurement may include interference measurement.

[0147] The PUCCH may have a PUCCH format, where the PUCCH format may be a format of physical layer processing of the PUCCH, or a format of information transmitted using the PUCCH.

[0148] The PUSCH may be transmitted to convey one or both of uplink control information and a transport block. The PUSCH may be used to convey one or both of uplink control information and a transport block. The PUSCH may be used to transmit at least some or all of the transport block, HARQ-ACK, channel state information, and a scheduling request. The PUSCH is used at least to transmit a random access message 3. The PUSCH may be used to transmit information not described above. The terminal device 1 may transmit a PUSCH in which one or both of uplink control information and a transport block are allocated. The base station device 3 may receive a PUSCH in which one or both of uplink control information and a transport block are allocated.

[0149] The PRACH may be transmitted to convey an index of the random access preamble (random access message 1). The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit the random access preamble on the PRACH. The base station device 3 may receive the random access preamble on the PRACH.

[0150] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in the physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present embodiment, some or all of the following uplink physical signals may be used: UL DMRS (UpLink Demodulation Reference Signal) SRS (Sounding Reference Signal) UL PTRS (UpLink Phase Tracking Reference Signal)

[0151] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0152] A set of antenna ports for DMRS for PUSCH (DMRS related to PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) may be determined based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for DMRS for PUSCH may be the same as the set of antenna ports for the PUSCH. A propagation path for PUSCH may be estimated from the DMRS for the PUSCH.

[0153] The set of antenna ports for the DMRS for the PUCCH (the DMRS associated with the PUCCH, the DMRS included in the PUCCH, and the DMRS corresponding to the PUCCH) may be the same as the set of antenna ports for the PUCCH. The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0154] The downlink physical channel may correspond to a set of resource elements that transmit information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The radio transceiver unit 30 may transmit the downlink physical channel. The radio transceiver unit 10 may receive the downlink physical channel. In the downlink of the wireless communication system according to one aspect of the present embodiment, some or all of the following downlink physical channels may be used: PBCH (Physical Broadcast Channel) PDCCH (Physical Downlink Control Channel) PDSCH (Physical Downlink Shared Channel)

[0155] The PBCH is transmitted to carry Master Information Blocks (MIBs) and / or physical layer control information (PLIC), which is information generated in the physical layer. MIBs are RRC messages delivered from higher layers on the Broadcast Control Channel (BCCH).

[0156] The PDCCH is used at least for transmitting (transmitting) downlink control information (DCI). The downlink control information may be allocated to the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is allocated. The base station device 3 may transmit the PDCCH in which the downlink control information is allocated.

[0157] The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[0158] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and the downlink control information may be described as equivalent. For example, the base station device 3 may include the downlink control information in a DCI format and transmit it to the terminal device 1. Furthermore, the terminal device 1 may control the radio transceiver unit 10 using the downlink control information included in the detected DCI format.

[0159] The downlink control information may include at least one of a downlink grant (DL grant) or an uplink grant (UL grant). A DCI format used for scheduling the PDSCH is also referred to as a downlink DCI format. A DCI format used for scheduling the PUSCH is also referred to as an uplink DCI format. A downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation).

[0160] DCI formats include DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1. The uplink DCI format is a general term for DCI format 0_0, DCI format 0_1, etc. The downlink DCI format is a general term for DCI format 1_0, DCI format 1_1, etc.

[0161] The uplink DCI format is used for scheduling the PUSCH allocated to a certain cell. The uplink DCI format includes at least some or all of 1A to 1E. 1A) Identifier for DCI formats field 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (Modulation and Coding Scheme field) 1F) CSI request field

[0162] The DCI format identification field may indicate whether the DCI format including the DCI format identification field is an uplink DCI format or a downlink DCI format. That is, the DCI format identification field may be included in both the uplink DCI format and the downlink DCI format. Here, the DCI format identification field included in the uplink DCI format may indicate 0.

[0163] The frequency domain resource allocation field included in the uplink DCI format may be used to indicate the allocation of frequency resources for the PUSCH scheduled by the uplink DCI format.

[0164] The time domain resource allocation field included in the uplink DCI format may be used to indicate the allocation of time resources for the PUSCH scheduled by the uplink DCI format.

[0165] The frequency hopping flag field may be used to indicate whether frequency hopping is applied to the PUSCH scheduled by the uplink DCI format.

[0166] The MCS field included in an uplink DCI format may be used to indicate one or both of a modulation scheme for a PUSCH scheduled by the uplink DCI format and a target coding rate scheduled by the uplink DCI format. The target coding rate may be a target coding rate for a transport block assigned to the PUSCH. The size of the transport block (TBS) assigned to the PUSCH may be determined based on part or all of the target coding rate and the modulation scheme for the PUSCH.

[0167] The CSI request field may be used to indicate the reporting of CSI.

[0168] The downlink DCI format is used for scheduling the PDSCH allocated to a certain cell. The downlink DCI format includes some or all of 3A to 3F. 2A) DCI format specific field 2B) Frequency domain resource allocation field 2C) Time domain resource allocation field 2D) MCS field 2E) PDSCH to HARQ feedback timing indicator field 2F) PUCCH resource indicator field

[0169] The DCI format specific field included in the downlink DCI format may indicate 1.

[0170] The frequency domain resource allocation field included in the downlink DCI format may be used to indicate the allocation of frequency resources for the PDSCH scheduled by the DCI format.

[0171] The time domain resource allocation field included in the downlink DCI format may be used to indicate the allocation of time resources for the PDSCH scheduled by the DCI format.

[0172] The MCS field included in a downlink DCI format may be used to indicate one or both of a modulation scheme for a PDSCH scheduled by the DCI format and a target coding rate for the PDSCH scheduled by the DCI format. The target coding rate may be a target coding rate for a transport block allocated to the PDSCH. The size of the transport block (TBS) allocated to the PDSCH may be determined based on one or both of the target coding rate and the modulation scheme for the PDSCH.

[0173] The PDSCH_HARQ feedback timing indication field may be used to indicate an offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH. The PDSCH to HARQ feedback timing indication field may be a field indicating timing K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the PUCCH or PUSCH containing at least a HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH containing at least a HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1.

[0174] The PDSCH_HARQ feedback timing indication field may also be referred to as a PDSCH-to-HARQ feedback timing indicator field or a HARQ indication field.

[0175] The PUCCH resource indication field may be used to indicate the resource of the PUCCH.

[0176] A downlink grant is used for scheduling at least one PDSCH in one serving cell. The downlink grant is used for scheduling at least one PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling a PDSCH in a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used for scheduling at least one PUSCH in one serving cell.

[0177] Note that various DCI formats may further include fields different from the above-mentioned fields.

[0178] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be allocated to the PDSCH. The base station device 3 may transmit the PDSCH in which the transport block is allocated. The terminal device 1 may receive the PDSCH in which the transport block is allocated.

[0179] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the radio communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used: Synchronization signal (SS) DL DMRS (DownLink Demodulation Reference Signal) CSI-RS (Channel State Information-Reference Signal) DL PTRS (DownLink Phase Tracking Reference Signal)

[0180] The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal is a general term for a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

[0181] An SS block (SS / PBCH block) is composed of at least a PSS, an SSS, and some or all of the PBCH.

[0182] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0183] The PBCH on which the PBCH symbol is transmitted at a certain antenna port may be estimated by the DMRS for the PBCH that is placed in the slot to which the PBCH is mapped and is included in the SS / PBCH block to which the PBCH belongs.

[0184] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0185] A set of antenna ports for a DMRS for a PDSCH (a DMRS associated with a PDSCH, a DMRS included in a PDSCH, or a DMRS corresponding to a PDSCH) may be determined based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0186] A propagation path of a PDSCH may be estimated from a DMRS for the PDSCH. If a set of resource elements carrying a certain PDSCH symbol and a set of resource elements carrying a DMRS symbol for the PDSCH are included in the same precoding resource group (PRG), the PDSCH carrying the PDSCH symbol for a certain antenna port may be estimated by the DMRS for the PDSCH.

[0187] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

[0188] The propagation path of a PDCCH may be estimated from the DMRS for the PDCCH. If the same precoder is applied (or assumed to be applied) to a set of resource elements on which a certain PDCCH symbol is transmitted and a set of resource elements on which a DMRS symbol for the PDCCH is transmitted, the PDCCH on which the PDCCH symbol for a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

[0189] The BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (Downlink-Shared CHannel) are transport channels.

[0190] The BCH of the transport layer may be mapped to the PBCH of the physical layer, i.e., the transport block delivered from higher layers on the BCH of the transport layer may be placed on the PBCH of the physical layer, and the UL-SCH of the transport layer may be mapped to the PUSCH of the physical layer.

[0191] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0192] The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH may be used to deliver an RRC message including an MIB or an RRC message including system information. The CCCH may also be used to transmit an RRC message including RRC parameters common to multiple terminal devices 1. Here, the CCCH may be used, for example, for terminal devices 1 that are not RRC connected. The DCCH may also be used to transmit an RRC message dedicated to a certain terminal device 1. Here, the DCCH may be used, for example, for terminal devices 1 that are RRC connected.

[0193] The BCCH may be mapped to the BCH or DL-SCH. That is, an RRC message containing MIB information may be delivered on the BCH. An RRC message containing system information other than MIB information may be delivered on the DL-SCH. The CCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the CCCH may be delivered on the DL-SCH or UL-SCH. The DCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the DCCH may be delivered on the DL-SCH or UL-SCH.

[0194] The UL-SCH may be mapped to the PUSCH, the DL-SCH may be mapped to the PDSCH, and the BCH may be mapped to the PBCH.

[0195] The medium access control layer processing unit 15 may implement a random access procedure.

[0196] For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH, including a C-RNTI (Cell-Radio Network Temporary Identifier).

[0197] One physical channel may be mapped to one serving cell, and one physical channel may be mapped to one BWP configured on one carrier included in one serving cell.

[0198] One or more control resource sets (CORESETs) may be configured in the terminal device 1. The terminal device 1 monitors the PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and / or sets of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or a DCI format transmitted via the PDCCH.

[0199] A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0200] A set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. That is, the set of PDCCH candidates monitored by the terminal device 1 is given by the search space.

[0201] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates may indicate the number of CCEs constituting the PDCCH. The PDCCH candidates may be mapped to one or more CCEs.

[0202] The search area set may be configured to include at least one or more search areas, and an index (search area index) may be assigned to each search area.

[0203] Each search space set may be associated with at least one control resource set, each search space set may be included in one control resource set, and each search space set may be given an index of the control resource set associated with that search space set.

[0204] The terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by blindly detecting PDCCH candidates included in the search space within the control resource set.

[0205] In various aspects of the present embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

[0206] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto a PUCCH and transmit the same. The terminal device 1 may multiplex the UCI onto a PUSCH and transmit the same. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0207] HARQ-ACK may also be referred to as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

[0208] If data is successfully decoded, an ACK is generated for the data. If data is not successfully decoded, a NACK is generated for the data. The HARQ-ACK may include at least a HARQ-ACK bit corresponding to at least one transport block. The HARQ-ACK bit may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or multiple transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or multiple transport blocks may correspond to a PDSCH including the one or multiple transport blocks.

[0209] HARQ control for one transport block may be referred to as an HARQ process. One HARQ process identifier may be assigned to each HARQ process. The DCI format includes a field indicating the HARQ process identifier (HARQ process number).

[0210] An NDI (New Data Indicator) is indicated in the DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) including scheduling information for PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format. The base station device 3 sets the updated NDI value or the NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

[0211] The terminal device 1 determines whether a received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is toggled, determines that the received transport block is a new transmission. When transmitting a transport block for a new transmission in a certain HARQ process, the base station device 3 toggles the NDI value stored for the HARQ process and transmits the toggled NDI to the terminal device 1. When transmitting a transport block for a retransmission in a certain HARQ process, the base station device 3 does not toggle the NDI value stored for the HARQ process and transmits an untoggled NDI to the terminal device 1. The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is not toggled (they are the same), determines that the received transport block is a retransmission. Note that toggling here means switching to a different value.

[0212] The term "physical signal" is also a general term for the sidelink physical channel and the sidelink physical signal. The term "physical channel" is also a general term for the sidelink physical channel. The term "physical signal" is also a general term for the sidelink physical signal.

[0213] A sidelink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. A sidelink physical channel is a physical channel used in the sidelink. The sidelink physical channel may be transmitted by the radio transceiver unit 10. The sidelink physical channel may be received by the radio transceiver unit 10. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following sidelink physical channels are used: PSBCH (Physical Sidelink Broadcast CHannel), PSCCH (Physical Sidelink Control CHannel), PSSCH (Physical Sidelink Shared CHannel), and PSFCH (Physical Sidelink Feedback CHannel).

[0214] The PSBCH is transmitted to convey the DFN (Direct Frame Number), the TDD UL-DL configuration, the slot index (the slot index of the slot in which the PSBCH is placed), and the in-coverage indicator (an identifier indicating whether the transmitting terminal device 1 is located within the coverage of the base station device 3).

[0215] The PSCCH is used at least for transmitting (transmitting) sidelink control information (SCI). The sidelink control information may be arranged in the PSCCH. The terminal device 1 may receive the PSCCH in which the sidelink control information is arranged. The terminal device 1 may transmit the PSCCH in which the sidelink control information is arranged.

[0216] The sidelink control information is transmitted and received in the sidelink control information format (SCI format). The SCI transmitted and received on the PSCCH is st stage SCI (1 st The SCI transmitted and received on the PSSCH is called the SCI format. nd stage SCI (2 ndThis is called the SCI format. 1 st The stage SCI format may include SCI format 1-A. SCI format 1-A is a combination of PSSCH and 2 nd Used for scheduling of stage SCI. SCI format 1-A has a field indicating priority, a field indicating frequency resource allocation, a field indicating time resource allocation, a field indicating resource reservation interval, a field indicating DM RS pattern, and 2 nd A field indicating the stage SCI format (SCI format 2-A, SCI format 2-B), a beta offset (2 nd It includes a field indicating the number of DM RS ports, a field indicating the MCS, a field indicating the MCS table, a field containing a PSFCH overhead indication, and a field indicating whether collision information can be received.

[0217] 2 nd The stage SCI is used for decoding the PSSCH. SCI format 2-A contains the HARQ process number, NDI, RV (Redundancy version), Source ID, Destination ID, HARQ feedback enable / disable indicator, cast type indicator (unicast, broadcast, groupcast), and CSI request information. SCI format 2-B contains the HARQ process number, NDI, RV, Source ID, Destination ID, HARQ feedback enable / disable indicator, Zone ID, and communication range request information.

[0218] PSSCH transmits sidelink data (sidelink transport blocks, sidelink PDUs), 2 nd The PSSCH may be transmitted to carry sidelink data, 2 ndThe terminal device 1 may transmit sidelink data, 2 nd The terminal device 1 may transmit the sidelink data, 2, and the PSSCH in which the stage SCI is arranged. nd A PSSCH in which a stage SCI is arranged may be received.

[0219] The PSFCH is used to transmit HARQ-ACK information corresponding to PSSCH reception. The terminal device 1 transmits the PSFCH in which the HARQ-ACK information is arranged. The terminal device 1 receives the PSFCH in which the HARQ-ACK information is arranged.

[0220] The terminal device 1 is instructed in the SCI format to transmit a PSFCH including HARQ-ACK information in response to PSSCH reception. The terminal device 1 transmits the PSFCH in the first slot including a PSFCH resource after a set gap from the last slot of PSSCH reception. PSFCH resources (resource blocks) are associated with PSSCH subchannels and PSSCH slots. The PSSCH in the smallest-numbered subchannel and the smallest-numbered slot is associated with the smallest-numbered PSFCH resource, and then the PSSCH in the smallest-numbered subchannel and the second smallest-numbered slot is associated with the second smallest-numbered PSFCH resource. That is, first, PSSCH and PSFCH resources are associated in the slot direction. Next, PSSCH and PSFCH resources are associated in the subchannel direction. The PSFCH for transmitting and receiving HARQ-ACK information is further composed of a cyclic shift pair. The terminal device 1 determines the PSFCH resource to use from multiple PSFCH resources configured with the same resource block but with different cyclic shift pairs, based on the physical layer source ID provided by the 2nd SCI format for scheduling PSSCH reception. The terminal device 1 determines the cyclic shift value from the cyclic shift pair.

[0221] The PSFCH is used to transmit collision information. The terminal device 1 transmits the PSFCH in which the collision information is arranged. The terminal device 1 receives the PSFCH in which the collision information is arranged.

[0222] The terminal device 1 determines one or more slots and resource blocks reserved for PSSCH transmission based on the instruction in SCI format 1-A. If the terminal device 1 determines that there is a collision for the resources reserved for PSSCH transmission, the terminal device 1 provides collision information in the PSFCH. The terminal device 1 measures the power of the received signal from another terminal device 1, compares the measured received power with a threshold, and determines whether a collision may occur for the reserved resources. The PSFCH for transmitting and receiving collision information consists of resource blocks and cyclic shift pairs. The PSFCH resources for transmitting and receiving collision information are numbered sequentially first in the resource block direction and then in the cyclic shift pair direction. The terminal device 1 determines the PSFCH resources containing collision information based on the physical layer source ID provided by the second SCI format for scheduling PSSCH reception or the second SCI format for reserving resources. The terminal device 1 determines the cyclic shift value from the cyclic shift pair.

[0223] The PSFCH is used to transmit sidelink beam-associated information. The terminal device 1 transmits the PSFCH in which the sidelink beam-associated information is arranged. The terminal device 1 receives the PSFCH in which the sidelink beam-associated information is arranged.

[0224] The terminal device 1 may be instructed to transmit the sidelink beam-associated information in the SCI format. The terminal device 1 may be instructed, in the SCI format, of PSFCH resources for transmitting and receiving the sidelink beam-associated information. The terminal device 1 may determine PSFCH resources for transmitting and receiving the sidelink beam-associated information based on subchannels used in a PSCCH including an SCI format instructing the transmission of the sidelink beam-associated information. The terminal device 1 may determine PSFCH resources for transmitting and receiving the sidelink beam-associated information based on subchannels used in a PSSCH including an SCI format instructing the transmission of the sidelink beam-associated information. Subchannel numbers may be associated in advance with PSFCH resource numbers for transmitting and receiving the sidelink beam-associated information. A gap regarding reporting of the sidelink beam-associated information may be set from the base station device 3 to the terminal device 1.

[0225] The terminal device 1 may transmit the PSFCH in the first slot including a PSFCH resource for transmitting and receiving the sidelink beam-related information after a configured gap (a gap related to reporting the sidelink beam-related information) from the last slot of the PSCCH including an SCI format instructing the transmission of the sidelink beam-related information. The terminal device 1 may transmit the PSFCH in the first slot including a PSFCH resource for transmitting and receiving the sidelink beam-related information after a configured gap (a gap related to reporting the sidelink beam-related information) from the last slot of the PSCCH including an SCI format instructing the transmission of the sidelink beam-related information. Multiple PSFCH resources for transmitting and receiving the sidelink beam-related information may be used, and a selection of resources may implicitly indicate part of the sidelink beam-related information.

[0226] The terminal device 1 may report sidelink beam-related information using a PSFCH resource associated with a CSI-RS (or SSB) resource for measuring reception quality. For example, a combination of time and frequency resources of the CSI-RS is associated in advance with a combination of time, frequency, and code resources of the PSFCH. For example, the terminal device 1 may transmit the PSFCH in the first slot after a configured gap from the slot in which the CSI-RS is allocated, which includes a PSFCH resource for transmitting and receiving sidelink beam-related information. For example, the terminal device 1 may transmit the PSFCH in the second slot after a configured gap from the slot in which the CSI-RS is allocated, which includes a PSFCH resource for transmitting and receiving sidelink beam-related information. CSI-RS resources in different slots may be associated with PSFCH resources for transmitting and receiving sidelink beam-related information in the same slot.

[0227] For example, CSI-RS is placed in four different slots (slot #1, slot #2, slot #3, slot #4), a different transmission beam is applied to each CSI-RS, and beam sweeping is performed. The PSFCH resource corresponding to the CSI-RS in slot #1, the PSFCH resource corresponding to the CSI-RS in slot #2, the PSFCH resource corresponding to the CSI-RS in slot #3, and the PSFCH resource corresponding to the CSI-RS in slot #4 are assigned to the same slot (slot #100). For example, CSI-RS is placed in eight different slots (slot #1, slot #2, slot #3, slot #4, slot #5, slot #6, slot #7, slot #8), a different transmission beam is applied to each CSI-RS, and beam sweeping is performed. The PSFCH resource corresponding to the CSI-RS in slot #1, the PSFCH resource corresponding to the CSI-RS in slot #2, the PSFCH resource corresponding to the CSI-RS in slot #3, and the PSFCH resource corresponding to the CSI-RS in slot #4 are associated with the same slot (slot #100), and the PSFCH resource corresponding to the CSI-RS in slot #5, the PSFCH resource corresponding to the CSI-RS in slot #6, the PSFCH resource corresponding to the CSI-RS in slot #7, and the PSFCH resource corresponding to the CSI-RS in slot #8 are associated with the same slot (slot #200).

[0228] The sidelink physical signal may correspond to a set of resource elements. The sidelink physical signal does not have to be used to transmit information generated in a higher layer. The sidelink physical signal may be used to transmit information generated in a physical layer. The radio transceiver 10 may transmit the sidelink physical signal. The radio transceiver 10 may receive the sidelink physical signal. In the sidelink of the wireless communication system according to one aspect of the present embodiment, at least some or all of the following sidelink physical signals may be used: Sidelink Synchronization Signal (S-SS), Sidelink DM RS, Sidelink CSI-RS, and Sidelink PT-RS.

[0229] The sidelink synchronization signal is used by the terminal device 1 to synchronize the sidelink frequency domain and / or time domain. The sidelink synchronization signal is a collective term for the sidelink primary synchronization signal (S-PSS) and the sidelink secondary synchronization signal (S-SSS). It is also called the sidelink SSB (S-SSB).

[0230] The sidelink DM RS is a general term for the DM RS for the PSBCH, the DM RS for the PSCCH, and the DM RS for the PSSCH. The time domain pattern of the DM RS for the PSSCH is selected by the transmitting terminal device 1. The time domain patterns of the selection candidates are configured for each resource pool.

[0231] The sidelink CSI-RS is a reference signal used for sidelink channel measurement. It configures time resource allocation (symbol positions to be allocated), frequency resource allocation, the number of antenna ports, and the number of layers for the CSI-RS. The terminal device 1 reports channel state information measured based on the sidelink CSI-RS using MAC CE. The terminal device 1 reports sidelink beam-related information (sidelink beam indication) based on the reception quality measured based on the sidelink CSI-RS using PSFCH. For example, the time resources, frequency resources, etc. of the CSI-RS for beam management are configured in advance.

[0232] Sidelink PT-RS may be supported only in the high frequency band (FR2). The time and frequency density of sidelink PT-RS is configured for each resource pool.

[0233] An access gain control (AGC) signal may be used, and the AGC signal may be placed in the first OFDM symbol of the slot.

[0234] The terminal device 1 may use the uplink PUCCH to report information about the sidelink HARQ-ACK received from the destination terminal device 1 to the base station device 3. A semi-static HARQ-ACK codebook or a dynamic HARQ-ACK codebook may be used.

[0235] The base station device 3 may notify the terminal device 1 of sidelink scheduling information using a DCI format. DCI format 3_0 is used for scheduling the PSCCH and PSSCH. DCI format 3_0 is configured to include some or all of the following information: Resource pool index Time gap HARQ process number NDI Subchannel allocation information SCI format 1_A field Timing indicator for feeding back HARQ-ACK of PSSCH corresponding to PSFCH reception PUCCH resource indicator Configuration index Sidelink allocation index counter

[0236] The resource pool index indicates the resource pool used for the scheduled PSCCH and PSSCH. The time gap indicates the time from reception of DCI format 3_0 to sidelink transmission. The subchannel allocation information indicates the subchannel used for the scheduled PSCCH and PSSCH. The SCI format 1_A field includes information on frequency resource allocation and time resource allocation of SCI format 1_A transmitted by the terminal device 1 on the PSCCH. The timing indicator for feeding back HARQ-ACK of PSSCH corresponding to PSFCH reception indicates the timing at which the terminal device 1 feeds back HARQ-ACK information acquired by receiving the PSFCH from the remote terminal device 1 using the PUCCH. The PUCCH resource indicator indicates the PUCCH resource used to feed back HARQ-ACK information acquired by receiving the PSFCH. The configuration index indicates the configuration of the sidelink configured grant. The sidelink allocation index counter indicates the number of sidelink allocations assigned by the base station device 3 to the terminal device 1 within a certain period.

[0237] In resource allocation mode 2, in which the terminal device 1 automatically selects a sidelink grant, the terminal device 1 selects a resource from a resource pool. The terminal device 1 excludes resources recognized by SCIs transmitted by other terminal devices 1 from selection candidates. Resources indicated by SCIs transmitted by other terminal devices 1 are reserved and used by other terminal devices 1. If the RSRP of the detected PSSCH or the RSRP of the detected PSCCH is greater than a set value, the terminal device 1 excludes the resource corresponding to the PSSCH or PSCCH from selection candidates. The resource may be reserved and used by other terminal devices 1. The terminal device 1 finally selects one resource from the narrowed-down pool of resource candidates.

[0238] In sidelink resource allocation mode 2, the number of reserved resources is configured or pre-configured by RRC signaling. The second or third unit resource, other than the first unit resource, is the reserved resource on the time axis of a series of resources. The interval (in ms) between the first unit resource and the second unit resource, and the interval between the second unit resource and the third unit resource, are configured or pre-configured by RRC signaling. The interval between the reserved resources may be selected randomly.

[0239] 5 is a diagram showing a process related to PSFCH transmission according to one aspect of the present embodiment. The terminal device 1 determines to transmit the PSFCH in a certain slot (step S201). For example, the terminal device 1 receives a CSI-RS related to a beam, measures reception quality based on the received CSI-RS, and if the measured reception quality exceeds a certain threshold, determines to transmit the PSFCH in a slot to which a resource of the PSFCH (PSFCH for transmitting and receiving sidelink beam-related information) corresponding to the resource of the CSI-RS belongs. For example, the terminal device 1 receives a PSSCH and determines to transmit the PSFCH in a slot to which a resource of the PSFCH (PSFCH for transmitting and receiving HARQ-ACK information) corresponding to the resource of the received PSSCH belongs. Note that here, it is assumed that the terminal device 1 determines to transmit at least two PSFCHs for transmitting and receiving sidelink beam-related information in a certain slot.

[0240] Next, the terminal device 1 determines whether the number of PSFCHs determined to be transmitted in a certain slot exceeds the number of PSFCHs that can be transmitted (step S202). If the terminal device 1 determines that the number of PSFCHs determined to be transmitted in a certain slot exceeds the number of PSFCHs that can be transmitted (step S202: YES), the terminal device 1 selects a PSFCH corresponding to a CSI-RS with the best reception quality and transmits the selected PSFCH (step S203). For example, it is assumed that the terminal device 1 determines to transmit two PSFCHs for transmitting and receiving sidelink beam-related information and three PSFCHs for transmitting and receiving HARQ-ACK information, for a total of five PSFCHs, for a certain slot. For example, it is assumed that the number of PSFCHs that can be transmitted in a certain slot is four. The terminal device 1 selects a PSFCH corresponding to a CSI-RS with the best reception quality for the two PSFCHs for transmitting and receiving sidelink beam-related information. The terminal device 1 transmits one PSFCH for transmitting and receiving the selected sidelink beam-associated information and three PSFCHs for transmitting and receiving HARQ-ACK information, for a total of four PSFCHs. If the terminal device 1 determines that the number of PSFCHs determined to be transmitted in a certain slot does not exceed the number of PSFCHs that can be transmitted (step S202: NO), it transmits the multiple PSFCHs determined to be transmitted (step S204). For example, it is assumed that the terminal device 1 determines to transmit two PSFCHs for transmitting and receiving sidelink beam-associated information and two PSFCHs for transmitting and receiving HARQ-ACK information, for a total of two PSFCHs, for a certain slot. For example, it is assumed that the number of PSFCHs that can be transmitted in a certain slot is four. The terminal device 1 determines that the number of PSFCHs determined to be transmitted does not exceed the number of PSFCHs that can be transmitted in a certain slot, which is four, and transmits two PSFCHs for transmitting and receiving sidelink beam-associated information and two PSFCHs for transmitting and receiving HARQ-ACK information, for a total of four PSFCHs.

[0241] In the above example, we have described a case where multiple transmissions of PSFCHs for transmitting and receiving sidelink beam-related information and PSFCHs for transmitting and receiving HARQ-ACK information occur in the same slot, but transmissions of PSFCHs for transmitting and receiving collision information can also occur in the same slot.

[0242] As described above, when the terminal device 1 cannot transmit multiple PSFCHs corresponding to CSI-RSs whose measured reception quality exceeds a certain threshold in a certain slot, the terminal device 1 selects and transmits the PSFCH corresponding to the CSI-RS with the best reception quality, thereby achieving more appropriate beam management. When the terminal device 1 can transmit multiple PSFCHs corresponding to CSI-RSs whose measured reception quality exceeds a certain threshold in a certain slot, the terminal device 1 transmits PSFCHs corresponding to multiple CSI-RSs with good reception quality, allowing the other terminal device 1 to select a preferred beam from multiple beam options determined from the reported PSFCH, taking into account the beams used for the other terminal device 1, thereby achieving more appropriate beam management. This embodiment enables efficient exchange of sidelink beam-related information, HARQ-ACK information, and collision information between terminal devices 1.

[0243] The programs running on the base station device 3 and terminal device 1 according to this embodiment may be programs (programs that cause a computer to function) that control a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments according to this embodiment. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) or HDD (Hard Disk Drive), and is read, modified, and written by the CPU as needed.

[0244] Note that the terminal device 1 and part of the base station device 3 in the above-described embodiment may be realized by a computer. In this case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the control function.

[0245] The term "computer system" used here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. Also, the term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into the computer system.

[0246] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or a medium that stores a program for a certain period of time, such as a volatile memory within a computer system that serves as a server or client in such a case. The program may also be one that realizes part of the above-mentioned functions, or one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0247] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0248] Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as a collection.

[0249] Furthermore, the base station device 3 in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). Furthermore, the base station device 3 in the above-described embodiment may have some or all of the functions of an upper node for the eNodeB and / or the gNB.

[0250] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments may be realized as an LSI, which is typically an integrated circuit, or as a chipset. Each functional block of the terminal device 1 and base station device 3 may be individually formed into a chip, or some or all of them may be integrated into a chip. Furthermore, the integrated circuit method is not limited to LSI, and may be realized using a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

[0251] Furthermore, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0252] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the gist of the present invention. Furthermore, various modifications of the present embodiment are possible within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present embodiment. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included.

[0253] One aspect of the present invention can be used, for example, in a communication system, a communication device (e.g., a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (e.g., a communication chip), or a program.

[0254] 1 (1A, 1B, 1C) Terminal device 3 (3A, 3B, 3C) Base station device 10, 30 Radio transmission / reception unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device having a processor and a memory for storing computer program code, the terminal device performing operations including: receiving a reference signal related to a beam; measuring reception quality based on the received reference signal; determining to transmit a PSFCH including a beam instruction on a resource corresponding to a resource of the reference signal if the measured reception quality exceeds a certain threshold; and, if a plurality of the PSFCHs determined to be transmitted in a certain slot exceed the number of transmittable PSFCHs, selecting and transmitting the PSFCH corresponding to the reference signal with the best reception quality.

2. The terminal device according to claim 1, which executes an operation including: when a PSFCH including HARQ-ACK information is also generated in the slot, and the sum of the multiple PSFCHs including beam instructions and the one or more PSFCHs including HARQ-ACK information exceeds the number of transmittable PSFCHs, selecting and transmitting the PSFCH corresponding to the reference signal with the best reception quality.

3. A communication method used in a terminal device, comprising: a step of receiving a reference signal related to a beam; a step of measuring reception quality based on the received reference signal; a step of determining to transmit a PSFCH including a beam instruction on a resource corresponding to a resource of the reference signal if the measured reception quality exceeds a certain threshold; and a step of selecting and transmitting the PSFCH corresponding to the reference signal with the best reception quality if the multiple PSFCHs determined to be transmitted in a certain slot exceed the number of transmittable PSFCHs.