Terminal device and communication method

Abstract

To achieve efficient channel access by applying CPE even if there are no sensing results.SOLUTION: A terminal device receives a set of preferred resources from another terminal device, and if the terminal device does not have its own sensing results and performs PSCCH / PSSCH transmission using resources selected from the set of preferred resources, the terminal device applies a default CPE starting position to the PSCCH / PSSCH transmission and performs transmission.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a terminal device and a communication method. [Background technology]

[0002] Radio access method and radio network for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") LTE is being studied by the 3rd Generation Partnership Project (3GPP). In LTE, a base station device is also called eNodeB (evolved NodeB) and a terminal device is also called UE (User Equipment). LTE is a cellular communication system in which areas covered by a base station device are arranged in multiple cells. A single base station device may manage multiple serving cells.

[0003] 3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as the communication method for 5G. NR is expected to meet the requirements of three scenarios: eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication) within a single technology framework.

[0004] NR supports sidelink technology, which allows terminal devices to communicate directly with each other without going through a base station device. Furthermore, the application of sidelink technology to unlicensed spectrum is being considered (Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Title: New WID on NR sidelink evolution ", RP-213678, OPPO, LG Electronics. 3GPP TSG RAN Meeting #94e, Dec.6-17, 2021 Summary of the Invention [Problem to be solved by the invention]

[0006] In unlicensed bands, LBT (Listen Before Talk) based on CCA (Clear Channel Assessment) is used to ensure coexistence with other systems. In Japan, Europe, etc., LBT functionality is required for systems operating in the unlicensed 5 GHz band. When sidelink transmission is performed in an unlicensed band, a cyclic prefix extension (CPE) can be applied to the sidelink transmission. In an environment where multiple system devices (terminal devices, base station devices, access points, etc.) may coexist, when sidelink transmission is performed using resources where sensing is not performed, a given CPE The present invention provides a terminal device capable of realizing fair channel access by applying the above method, and a communication method used in the terminal device. [Means for solving the problem]

[0007] (1) A first aspect of the present invention is a terminal device, which receives a preferred resource from another terminal device. and a transmitting unit that applies a default CPE starting position to the PSCCH / PSSCH transmission and transmits the PSCCH / PSSCH when the terminal device does not have its own sensing result and performs PSCCH / PSSCH transmission on resources selected from the set of preferred resources.

[0008] (2) A second aspect of the present invention is a communication method used in a terminal device, which receives a set of preferred resources from another terminal device and, if the terminal device does not have its own sensing results, and when transmitting PSCCH / PSSCH using resources selected from the set of preferred resources, applying a default CPE starting position to the PSCCH / PSSCH transmission. [Effects of the Invention]

[0009] The CPE starting position can be applied to PSCCH / PSSCH transmissions on resources where sensing is not performed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. [Figure 3] 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 4] FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to one aspect of the present embodiment. [Figure 5] FIG. 10 is a diagram illustrating an example of interlace mapping according to one aspect of the present embodiment. [Figure 6] FIG. 10 is a diagram showing an example of an arrangement of PSCCHs monitored in a terminal device 1 according to an aspect of the present embodiment. [Figure 7] FIG. 10 is a diagram showing an example of an arrangement of PSCCHs monitored in a terminal device 1 according to an aspect of the present embodiment. [Figure 8] FIG. 2 is a diagram illustrating an example of a resource selection procedure in a terminal device 1 according to an aspect of the present embodiment. [Figure 9]FIG. 2 is a diagram illustrating an example of a CPE starting position of a terminal device 1 according to an aspect of the present embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of a resource selection procedure for determining IUC information in a resource pool of a terminal device 1 according to an aspect of the present embodiment. [Figure 11] FIG. 2 is a diagram showing an example of IUC information in the time domain of a terminal device 1 according to an aspect of the present embodiment. [Figure 12] 10 is a diagram illustrating an example of a process for a terminal device 1 according to an aspect of the present embodiment to determine a CPE starting position. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described.

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

[0013] A 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 is a 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 that is A cell in which an initial connection establishment procedure or a connection re-establishment procedure is performed by the terminal device 1. The PSCell is a serving cell on which the 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 the serving cell. The serving cell identifier may be provided by a higher layer parameter.

[0016] Serving cell groups (cell groups) are MCG, SCG, and PUCCH cell groups. A serving cell group may include one or more serving cells (or component carriers). The 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 communicates with the terminal device 1 using different frequency bands (carrier frequencies, frequency spectrums). This operation (multi-carrier operation) may be referred to as carrier aggregation or dual connectivity. Different cells (serving cells) use different frequency bands. In the base station device 3 and the terminal device 1, of the multiple cells used in carrier aggregation, one cell may use the downlink frequency band and the uplink frequency band, and the other cells may use only the downlink frequency band, or the other cells may also use the downlink frequency band and the 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. The sidelink between the end device 1 and the terminal device 1 may use DFT-s-OFDM.

[0021] As shown in FIG. 1, the base station device 3 may be configured with one transmission / reception device (or transmission point, transmission device, reception point, reception device, transmission / reception point). On the other hand, in some cases, the base station device 3 may be configured to include multiple transmission / reception devices. In the case where the plurality of transmitting / receiving devices are configured as above, each of the transmitting / receiving devices may be located at 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 ×Nf ) may be used to represent the length in the time domain, where Δf max = 480 kHz. f = 4096. The constant κ may be expressed as κ = Δf max ×N f / (Δf ref N f,r ef )=64. Also, Δf ref may be 15 kHz. f,re f 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 be configured to include 10 subframes. Here, the length of a subframe may be Tsf = (Δfmax × Nf / 1000) × Ts = 1 ms. Even if the number of OFDM symbols per Nsubframe, μsymb=Nslotsymb×Nsubframe, μslot good.

[0027] An OFDM symbol is used as a time domain unit of a communication method used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit of CP-OFDM. , 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 the case of normal CP, In the setting, Nslotsymb=14 may be used. In the setting of the extended CP, Nslotsymb=12 may be used.

[0029] Slots may be indexed in the time domain, e.g., the slot index nμs is an ascending integer value ranging from 0 to Nsubframe,μslot-1 in subframes. The slot index nμs,f may be given in order in a radio frame. It may be given in ascending order as integer values ​​ranging from 0 to Nframe, μslot-1.

[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, the subcarrier index ksc and the OFDM symbol index The resource identified by the lsym is a ResourceElement (RE). It is also called.

[0032] A resource block (RB) contains NRBsc consecutive subcarriers. The resource blocks are divided into common resource blocks (CRBs), physical resource blocks, and It is a general term for a source block (PRB: Physical Resource Block) and a virtual resource block (VRB: Virtual Resource Block). For example, NRBsc=12 may be used.

[0033] A BandWidth Part (BWP) may be configured as a subset of the resource grid. Here, the BWP set for the downlink is also called a downlink BWP, and the BWP set for the uplink is also called an uplink BWP.

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

[0035] Carrier aggregation is the process of providing multiple aggregated serving The carrier aggregation may be performed by using a cell. The carrier aggregation may be performed by using a plurality of aggregated component carriers. The carrier aggregation may be performed by using a plurality of aggregated downlink component carriers. The carrier aggregation may be performed by 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 an antenna unit 11, an RF (Radio Frequency) unit 12, and The radio transceiver 10 is configured to include at least a part or all of a baseband unit 13 and a medium access control layer processing unit 15 and a part or all of a radio resource control layer processing unit 16. The radio transceiver 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0038] The wireless transceiver 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 10 may generate a baseband signal of a sidelink physical channel. For example, the radio transceiver 10 may generate a baseband signal of a sidelink physical signal. For example, the radio transceiver 10 may attempt to detect information transmitted by the sidelink physical channel. For example, the radio transceiver 10 may attempt to detect information transmitted by the sidelink physical signal.

[0042] The receiving unit of the terminal device 1 receives the PDCCH. Processes receiving PDCCH in frequency band (cell, component carrier, carrier) The reception processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH. The reception processing unit performs a process of receiving the PDCCH and a process of detecting the downlink control information. cormorant.

[0043] The receiving unit of the terminal device 1 receives the PDSCH. Processes receiving PDSCH in frequency band (cell, component carrier, carrier) The reception processing unit of the terminal device 1 performs processes 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, The receiving unit of the terminal device 1 performs a process of detecting side link control information. The receiving unit of the terminal device 1 determines frequency resources (interlaces and resource blocks, which will be described later). The receiving unit of the terminal device 1 determines OFDM symbols in which the PSCCH can be arranged. The receiving unit of the terminal device 1 blindly decodes the PSCCH. The receiving unit of the terminal device 1 blindly decodes the PSCCH in one slot in one resource pool. The receiving unit of the terminal device 1 blindly decodes the PSCCH in one slot in one resource pool. The PSCCH in two or more slots may be blindly decoded. Two or more PSCCHs in one slot may be blindly decoded within 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 reception processing unit receives the HARQ-ACK via the PSFCH.

[0045] The transmission unit (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. HARQ-ACK is transmitted in the link frequency band (cell, component carrier, carrier).

[0046] The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for the PSSCH. The processing unit transmits the HARQ-ACK in the sidelink frequency band. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK on the PSFCH. The transmission processing unit of the terminal device 1 may transmit the HARQ-ACK on the PSSCH. The transmission processing unit of the terminal device 1 does not have to transmit the HARQ-ACK for the PSSCH.

[0047] The transmitting unit of the terminal device 1 transmits the PSCCH. The transmitting processing unit of the terminal device 1 performs processing such as encoding and modulation on the PSCCH. The transmitting processing unit of the terminal device 1 performs processing to transmit side link control information using the PSCCH. The transmitting unit of the terminal device 1 determines the frequency resources (interlaces and resource blocks, described later) that constitute the PSCCH. The transmitting unit of the terminal device 1 determines the OFDM symbols in which the PSCCH can be placed. The transmitting unit of the terminal device 1 transmits the PSSCH. The transmitting processing unit of the terminal device 1 performs processing such as encoding and modulation on the PSSCH.

[0048] The upper layer processing unit 14 outputs uplink data (transport block) generated by user operation or the like to the radio transmitting and receiving unit 10. The upper layer processing unit 14 processes data from the MAC layer, packet Packet Data Convergence Protocol (PDCP) layer, wireless link It processes the control (RLC: Radio Link Control) layer and the RRC layer.

[0049] The upper layer processing unit 14 outputs the side link data (transport block) to the radio transmitting and receiving unit 10.

[0050] A medium access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs processing of the MAC layer.

[0051] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing for the RRC layer. The RRC layer processing unit 16 processes various setting information / parameters (RRC parameters) of the own device. The radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on the signals of the higher layer received from the base station device 3. The RRC 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. The setting information includes information on physical channels and physical signals (i.e., the physical layer), information on MAC layers, and the like. , PDCP layer, RLC layer, RRC layer processing or configuration related information. The parameters may be higher layer parameters.

[0052] For example, the radio resource control layer processing unit 16 may receive 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.

[0053] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a control resource set in the control resource set. The radio resource control layer processing unit 16 sets (configures) a search space in the control resource set. The radio resource control layer processing unit 16 sets (configures) PDCCH candidates to be monitored in the control resource set. The control unit 16 configures the number of PDCCH candidates to be monitored in the control resource set. The radio resource control processing unit 16 sets (configures) the aggregation level of the PDCCH candidates to be monitored within the control resource set.

[0054] The radio resource control layer processing unit 16 determines the DCI format monitored in the control resource set. The radio resource control layer processing unit 16 sets the DCI phase monitored within the search area. The radio resource control layer processing unit 16 may set a DCI format to be monitored in the control resource set based on the 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 in the control resource set based on the RRC signaling indicated from the base station device 3. The DCI format to be monitored within the search area may be configured according to the radio resource control. The layer processing unit 16 sets one or more DCI formats to be monitored in the receiving processing unit. do.

[0055] The radio resource control layer processing unit 16 performs settings related to a plurality of search areas, each of which is indexed.

[0056] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. Configure the settings related to CSI feedback (transmission of channel state information) for the radio resources. The 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 control layer processing unit 16 performs configuration related to multiple CSI feedbacks. The configuration related to multiple CSI feedbacks is each indexed.

[0057] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures the SPS resources (PDSCH The SPS resource (PDSCH resource) start timing (offset), the number of HARQ processes configured for SPS, the offset used to derive the HARQ process ID used for SPS, the RNTI value for SPS scheduling, etc. are set. The line resource control layer processing unit 16 performs settings related to a plurality of SPSs. The settings related to the plurality of SPSs are each indexed.

[0058] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets up a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation setting. The serving cell is 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 on the downlink component carrier set in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing on the uplink component carrier set in the carrier aggregation configuration.

[0059] The radio resource control layer processing unit 16 performs the RRC signaling 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 parameters related to the side link notified from the base station device 3. For example, the radio resource control layer processing unit 16 sets the OFDM symbol where the PSCCH is arranged. For example, the radio resource control layer processing unit 16 sets a band that constitutes one PSCCH. The radio resource control layer processing unit 16 performs settings for the radio transceiver unit 10 regarding transmission and reception of the PSCCH.

[0060] The medium access control layer processing unit (MAC layer processing unit) 15 receives the MAC CE from the base station device 3. (MAC Control Element) for secondary cell activation / deactivation The media access control layer processing unit (MAC layer processing unit) 15 performs activation. The radio resource control layer processing unit 16 performs a MAC CE process based on the MAC CE including the activation / deactivation information of the cell. The medium access control layer processing unit (MAC layer processing unit) 15 outputs information indicating activation / deactivation for the selected serving cells to the radio transceiver unit 10. The secondary cell is deactivated based on the timer. The medium access control layer processing unit (MAC layer processing unit) 15 performs the deactivation of the secondary cell based on the schedule from the base station device 3 to the serving cell. The system determines whether or not serving has been performed for a certain period of time by measuring with a timer, deactivates the serving cell, and controls the radio transceiver unit 10.

[0061] The medium access control layer processing unit (MAC layer processing unit) 15 performs sidelink HARQ operation. ,processes sidelink scheduling requests, sidelink buffer status reports, and CSI reports.

[0062] The radio resource control layer processing unit 16 may include function information generated based on the functions of the terminal device 1 in an RRC message and transmit the RRC message to the base station device 3.

[0063] The wireless transmission / reception unit 10 performs modulation, coding, and transmission processes. The wireless transmission / reception unit 10 generates a physical signal by performing coding, modulation, and baseband signal generation (conversion to a time-continuous signal) on data (transport blocks), and transmits the generated physical signal to the base station device 3.

[0064] 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.

[0065] The radio transceiver 10 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver 10 stops monitoring the PDCCH in the deactivated serving cell. For example, the radio transceiver 10 stops receiving the PDSCH in the serving cell. Stop the transmission of SRS in the activated serving cell. 10 stops transmitting PUSCH in the deactivated serving cell.

[0066] 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.

[0067] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 extracts a CP (Cyclic Prefix) 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.

[0068] 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 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.

[0069] 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 up-converts the analog signal to a carrier frequency. The RF unit 12 converts the RF signal 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 the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0070] The wireless transmitting / receiving unit 10 performs carrier sensing (LBT) before transmitting a signal to avoid collision of signals with other devices (apparatuses). The following types of LBT are used: Type 1: Random backoff using a variable-sized contention window LBT process Type 2A: LBT without random backoff process, performs carrier sensing for 25us before transmitting a signal Type 2B: LBT without random backoff process, performs carrier sensing for 16us before transmitting a signal Type 2C: No LBT

[0071] The wireless transceiver 10 transmits a signal after detecting that there is no transmission from other devices (idle state) during listening, and does not transmit a signal when detecting that there is transmission from other devices (busy state) during listening. If the LBT result is busy, the transmission opportunity is acquired and transmission is performed. The time for transmission opportunity is called Channel Occupancy Time (COT). In LBT, the terminal device 1 monitors the channel before transmitting data, and and transmits data if the channel is found to be idle.

[0072] When performing a random backoff process, the wireless transceiver 10 randomly generates a backoff counter value within the range of the contention window size after the previous transmission. In random backoff, the terminal device 1 evaluates whether the channel is in an idle state by detecting channel energy at each time interval using the random backoff counter. The wireless transceiver 10 waits until it confirms that the channel is idle for a certain period of time, and performs carrier sense (sensing) at each sensing slot time. If the carrier sense result shows that the channel is idle, the wireless transceiver 10 decreases the backoff counter value. If the carrier sense result shows that the channel is busy, the wireless transceiver 10 maintains the backoff counter value, waits until it confirms that the channel is idle for a certain period of time, and then performs carrier sense. As a result of repeating the above operations, As a result, after the backoff counter value reaches zero, the radio transceiver 10 obtains the right to access the channel and can start transmitting signals on that channel.

[0073] When HARQ-ACK feedback is applied to the sidelink, the radio transceiver 10 updates the contention window size based on the status of the HARQ-ACK. When the status of the HARQ-ACK is ACK, the radio transceiver 10 updates the contention window size. The wireless transceiver 10 sets the contention window size to the minimum value. If the status of the HARQ-ACK is NACK, the wireless transceiver 10 sets the contention window size to the next largest value. If the contention window size reaches the maximum value that can be set, the wireless transceiver 10 continues to use the maximum value even if the status of the HARQ-ACK is NACK.

[0074] The initial value of the random backoff counter may be an integer between 0 and the contention window size. Before the random backoff counter is initialized, the contention window size is adjusted to control the average time required for the terminal device 1 to access the channel.

[0075] Before transmitting on the channel, the terminal device 1 performs listen-before-talk (LBT) on the channel. The terminal device 1 may adjust the amount of time for which it performs the LBT. The terminal device 1 may select a random number between zero and the contention window size. If the channel is free for at least the amount of time associated with the random number, the terminal device 1 may obtain a transmission opportunity and transmit.

[0076] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0077] 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this 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 , a medium access control layer processing unit 35, and a radio resource control layer processing unit 36. The radio transceiver unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0078] The upper layer processing unit 34 performs processing on a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (RRC) layer. In this example, the MAC layer is also called the MAC sublayer, the PDCP layer is also called the PDCP sublayer, the RLC layer is also called the RLC sublayer, and the RRC layer is also called the RRC sublayer.

[0079] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing involves mapping between logical channels and transport channels, Or multiplexing multiple MAC SDUs (Service Data Units) into a transport block, or decomposing a transport block delivered from the physical layer on UL-SCH into one or multiple MAC SDUs. ,Application of HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and may include some or all of the processing of scheduling requests.

[0080] 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 CE, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

[0081] The radio resource control layer processing unit 36 ​​also manages various setting information / parameters (RRC parameters) of each terminal device 1. The radio resource control layer processing unit 36 ​​receives information via signals in higher layers. In other words, the radio resource control layer processing unit 36 ​​transmits / broadcasts information indicating the various setting information / parameters. The setting information may be information regarding a physical channel or a physical signal (i.e., a physical layer), a MAC layer, a PDCP layer, etc. The parameters may include information related to processing or configuration of the RLC layer, RRC layer, or 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 one of a BCCH (Broadcast Control CHannel), a CCCH (Common Control CHannel), and a DCCH (Dedicated Control CHannel).

[0082] The radio resource control layer processing unit 36 ​​receives the RRC message transmitted from the terminal device 1. The RRC parameters to be transmitted to the terminal device 1 may be determined based on the RRC parameters. Here, the RRC message transmitted from the terminal device 1 is related to the capability information report of the terminal device 1. That's fine.

[0083] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. A plurality of 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. Determine.

[0084] 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 in the transmission processing unit.

[0085] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search spaces, each of which is indexed.

[0086] 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 uplink resource control layer processing unit 36 ​​allocates resources for transmitting HARQ-ACK for PDSCH to the uplink. link frequency band (cell, component carrier, carrier).

[0087] The radio resource control layer processing unit 36 ​​transmits CSI feedback (channel The radio resource control layer processing unit 36 ​​performs settings related to the CSI feed. The radio resource control layer processing unit 36 ​​sets the transmission period of the CSI feedback, the transmission start timing (offset) of the CSI feedback, the type of CSI feedback information, etc. Configure the feedback settings. Multiple CSI feedback settings are It is indexed.

[0088] The radio resource control layer processing unit 36 ​​performs SPS-related settings for the terminal device 1. The resource control layer processing unit 36 ​​controls the period of the SPS resource (PDSCH resource), The radio resource control layer processing unit 36 ​​configures the start timing (offset) of the SPS (PDSCH resource), the number of HARQ processes configured for the SPS, the offset used to derive the HARQ process ID used for the SPS, the RNTI value for scheduling the SPS, etc. The radio resource control layer processing unit 36 ​​performs configuration related to multiple SPSs. The configuration related to multiple SPSs is assigned an index. .

[0089] 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.

[0090] 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 the parameters related to the sidelink. Sidelink BWP configuration Sidelink radio bearer configuration Sidelink measurement configuration

[0091] The information indicating the configuration of the Sidelink BWP is the symbol in the slot used for the Sidelink. start position, symbol length, PSBCH configuration, sidelink resource pool configuration, etc. The information indicating the PSBCH configuration includes information indicating parameters used for PSBCH transmission power control. The information indicating the sidelink resource pool configuration includes information indicating the configuration of a sidelink reception resource pool, the configuration of a sidelink transmission resource pool, etc. The configuration of the sidelink transmission resource pool includes the configuration of a 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 a transmission resource pool for a method (mode 2) in which the terminal device 1 autonomously selects resources.

[0092] The information indicating the configuration of the sidelink resource pool includes information indicating the configuration of the PSCCH, information indicating the configuration of the PSSCH, information indicating the configuration of the PSFCH, and information indicating the subchannel size of the sidelink , information indicating the start position of the sidelink subchannel, MCS test used in the sidelink Information indicating the cable, information indicating the sidelink PTRS configuration, and sidelink TDD UL-DL configuration information indicating the number of PRBs in the side link resource pool; information indicating the time resources of the sidelink, information indicating the parameters of the sidelink transmission power control, information indicating the maximum number of reserved PSCCH / PSSCH resources that can be indicated by one SCI, The information includes information indicating the set of sensing 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.

[0093] The information indicating the configuration of the sidelink resource pool may also include information indicating a slot configuration, which may be applied: a slot configuration in which the PSCCH can be allocated only in the first half of the slot (the second OFDM symbol, or the second and third OFDM symbols), a slot configuration in which the PSCCH can be allocated in the first half of the slot (the second OFDM symbol, or the second and third OFDM symbols), or a slot configuration in which the PSCCH can be allocated in the second half of the slot (the ninth OFDM symbol, or the ninth and tenth OFDM symbols).

[0094] 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. For example, if the PSCCH is arranged in the first half of a slot, the PSSCH is arranged in the second or subsequent OFDM symbols in the slot, and if the PSCCH is arranged in the second half of a slot, the PSSCH is arranged in the ninth or subsequent OFDM symbols in the slot. It is placed in the rule.

[0095] The information indicating the configuration of the PSCCH includes information indicating the number of symbols in the PSCCH, information indicating the number of RBs constituting the PSCCH, information indicating the initial value (ID) of the scrambling of the DM RS of the PSCCH, and first stage SCI Contains information indicating the number of bits reserved in

[0096] 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.

[0097] The information indicating the configuration of the PSFCH 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 sequence hopping of the PSFCH, information indicating the interval of the PSFCH resources, and information indicating the minimum time gap between the PSSCH and the PSFCH.

[0098] 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.

[0099] The information indicating the sidelink synchronization configuration includes information indicating whether the sidelink synchronization configuration is used for transmitting and receiving the sidelink synchronization signal when the terminal device 1 is synchronized to GNSS, or whether the sidelink synchronization configuration is used for transmitting and receiving the 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 synchronization reference terminal device 1, information indicating the number of sidelink SSB transmissions in one sidelink SSB period, information indicating the period and start position of the sidelink SSB, information indicating the ID of the sidelink synchronization signal, and It includes information indicating a threshold value used to determine whether to send a drink synchronization signal.

[0100] The information indicating the configuration of the sidelink radio bearer includes information indicating whether the terminal device 1 is a 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 indicates scheduling information to the terminal device 1, information indicating the configuration for a method (mode 2) in which the terminal device 1 autonomously selects resources, information indicating the configuration for CSI reporting, Information indicating whether sidelink scheduling is used, information indicating the configuration of sidelink scheduling requests, information indicating the priority of sidelink SSB transmission and reception, information indicating the RLC mode, information indicating the configuration of sidelink logical channels, information indicating the configuration of sidelink RLC, etc. Includes.

[0101] 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.

[0102] 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 the RNTI used by the base station device 3 to scramble the CRC of a DCI format (for example, DCI format 3_0) including scheduling information for the terminal device 1, information indicating the configuration of the sidelink MAC, and information indicating the configuration of the sidelink Configured Grant. The information indicating the Sidelink MAC configuration includes information indicating the Sidelink BSR configuration and information indicating a threshold used to determine the priority of Sidelink and Uplink transmissions. The information indicating the Sidelink Configured Grant configuration includes information indicating an ID for identifying the Sidelink Configured Grant, information indicating the frequency resource of the Sidelink Configured Grant, information indicating the time resource of the Sidelink Configured Grant, information indicating the HARQ process ID of the Sidelink Configured Grant, information indicating the resource used for Sidelink HARQ-ACK transmission, information indicating the duration of the Sidelink Configured Grant, information indicating the resource pool to which the Sidelink Configured Grant is applied, and information indicating the starting subchannel of the Sidelink Configured Grant.

[0103] The information indicating the configuration for the method (mode 2) in which the terminal device 1 autonomously selects resources includes information indicating the transmission parameters of the PSSCH such as MCS, subchannel number, number of retransmissions, and transmission power parameters, information indicating the probability used for resource selection, and information indicating the threshold value for RSRP used for resource selection.

[0104] 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.

[0105] 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.

[0106] The terminal device 1 transmits information about the side link to the base station device 3 by RRC signaling. The terminal device 1 notifies the user of the sidelink QoS information, including information indicating the frequencies at which the terminal device 1 is interested in receiving sidelink communications, information indicating the 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 the cast type (broadcast, groupcast, unicast) for requesting sidelink resources, information indicating the destination identity, and information regarding sidelink QoS. information indicating the RLC mode; and a list of synchronization references used by the terminal device 1. It includes information indicating the following.

[0107] The medium access control layer processing unit (MAC layer processing unit) 35 activates the secondary cell. 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 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 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 performs the The serving cell is deactivated by measuring with a timer whether scheduling has been performed for a certain period of time, and the radio transceiver 30 is controlled.

[0108] The functions of the wireless transceiver 30 are the same as those of the wireless transceiver 10, and therefore the description thereof will be omitted where appropriate. The wireless transceiver 30 performs physical layer processing. Here, the physical layer processing is performed by The physical layer processing may include some or all of the following: generating a baseband signal, generating a baseband signal of a physical signal, and detecting information carried by a physical channel. The physical layer processing may also include mapping a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0109] 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.

[0110] The radio transceiver 30 may perform some or all of modulation processing, coding processing, and transmission processing. The radio transceiver 30 may generate a physical signal based on some or all of coding processing, modulation processing, and baseband signal generation processing for a transport block. The radio transceiver 30 may map the physical signal to a certain BWP. The radio transceiver 30 , and may transmit the generated physical signal. For example, the radio transceiver 30 may attempt to detect information transmitted by an uplink physical channel. Here, a transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on an UL-SCH. For example, the radio transceiver 30 may attempt to detect information transmitted by an uplink physical signal.

[0111] The radio transmission / reception unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transmission / reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The radio transmission / reception unit 30 grasps PDCCH candidates monitored in the terminal device 1, The radio transmission / reception unit 30 grasps the search area for each PDCCH candidate monitored in the terminal device 1. It is determined which control channel elements the PDCCH candidate is made up of (the PDCCH candidate is made up of The radio transceiver 30 includes an SS determining unit, which determines the SS configured in the terminal device 1. The SS determining unit determines one or more PDCCH candidates in the control resource set configured as the search space of the terminal device. SS determining unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search area of ​​the control resource set of the terminal device 1.

[0112] 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 transmitting / receiving unit 30 notifies the terminal device 1 of the PDCCH candidates within the search space of the control resource set. The PDCCH is transmitted using the

[0113] The transmitter (also referred to as a transmission processor) 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 area set for 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 area set for the terminal device 1. The PDCCH is transmitted using the PDCCH candidates in the search area where the matching is performed.

[0114] The receiving unit (also referred to as a 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 ,Receive HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The reception processing unit of the base station device 3 receives HARQ-ACK for the PDSCH of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. do.

[0115] The receiving unit of the base station device 3 receives the sidelink HARQ-ACK from the terminal device 1. The terminal device 1 receives the sidelink HARQ-ACK acquired from the PSFCH received from the terminal device 1, which is the communication partner, on the sidelink. The base station device 3 transmits information about the HARQ-ACK link using the PUCCH.

[0116] The radio transceiver 30 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver 30 stops transmitting the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 30 is deactivated. For example, the radio transceiver unit 30 stops receiving SRS in the serving cell. The reception of PUSCH in the deactivated serving cell is stopped.

[0117] 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.

[0118] 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 CP (Cyclic Prefix) from the digitized baseband signal. Alternatively, a fast Fourier transform (FFT) may be performed on the subband signal to extract a frequency domain signal.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described.

[0123] 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.

[0124] An uplink physical channel may correspond to a set of resource elements carrying information originating at higher layers. The uplink physical channels may be transmitted by the radio transceiver unit 10. The uplink physical channels may be received by the radio transceiver unit 30. In a radio 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)

[0125] The PUCCH transmits (transmits) uplink control information (UCI). The uplink control information may be placed in the PUCCH. The wireless transmission and reception unit 10 may transmit a PUCCH in which uplink control information is arranged. The receiving unit 30 may receive a PUCCH in which uplink control information is arranged.

[0126] Uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) is used in combination with channel state information (CSI), schedule Scheduling Request (SR), HARQ-ACK (Hybrid Automatic Repeat The uplink control information may include some or all of the request ACKnowledgement (ACK) information. Note that the uplink control information may also include information not described above.

[0127] 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.

[0128] 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. An ACK may indicate that the transport block has been decoded successfully. A NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

[0129] HARQ-ACK for transport blocks is also called HARQ-ACK for PDSCH. Here, "HARQ-ACK for PDSCH" may refer to HARQ-ACK for a transport block included in the PDSCH.

[0130] A scheduling request may be used to request UL-SCH resources for an initial transmission. The scheduling request bit is either a positive SR or may be used to indicate either 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 the terminal device 1 requests UL-SCH resources for the initial transmission. 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 the terminal device 1 does not request UL-SCH resources for the initial transmission.

[0131] The channel state information is a channel quality indicator (CQI), a pre-conditioning The CQI may include some or all of a Precoder Matrix Indicator (PMI) and a Rank Indicator (RI). Alternatively, it is an index related to the quality of the physical channel, and PMI is an index related to the precoder. The RI is an index related to the transmission rank (or the number of transmission layers).

[0132] 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.

[0133] 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.

[0134] The PUSCH carries uplink control information and / or transport blocks. The PUSCH may be transmitted to convey uplink control information and transport information. The PUSCH may be used to carry one or both of the transport blocks. The PUSCH may be used to transmit at least some or all of the port blocks, HARQ-ACKs, channel state information, and scheduling requests. The PUSCH is used at least to transmit access message 3. The terminal device 1 may transmit uplink control information and / or a PUSCH in which a transport block is allocated. The station device 3 may receive a PUSCH in which either or both of the uplink control information and the transport block are arranged.

[0135] PRACH is the index of the random access preamble (random access message The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit a random access preamble on the PRACH. The base station device 3 may transmit a random access preamble on the PRACH. may be received.

[0136] 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 a 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)

[0137] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0138] The set of antenna ports for DMRS for PUSCH (DMRS related to PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) is given based on the set of antenna ports for the PUSCH. For example, for PUSCH The set of antenna ports for the DMRS is the same as the set of antenna ports for the PUSCH. Good too.

[0139] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0140] DMRS for PUCCH (DMRS related to PUCCH, DMRS included in PUCCH, DMRS corresponding to PUCCH) The set of antenna ports for RS may be the same as the set of antenna ports for PUCCH. stomach.

[0141] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0142] The downlink physical channel may correspond to a set of resource elements that convey information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The radio transceiver 30 may transmit the downlink physical channel. The radio transceiver 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)

[0143] The PBCH is transmitted to carry Master Information Blocks (MIBs) and / or physical layer control information, which is information generated in the physical layer. The MIBs are RRC messages delivered from higher layers on the Broadcast Control Channel (BCCH).

[0144] PDCCH is used to transmit (transmit) downlink control information (DCI). The downlink control information may be placed in the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is arranged. Alternatively, a PDCCH in which downlink control information is allocated may be transmitted.

[0145] 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 be It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[0146] 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 notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. The terminal device 1 may transmit the downlink control information included in the detected DCI format to the terminal device 1. In addition, the terminal device 1 may control the radio transmission / reception unit 10 using the downlink control information included in the detected DCI format. It may be controlled.

[0147] The downlink control information may include at least one of a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for scheduling the PDSCH is the downlink DCI format. The DCI format used for scheduling the PUSCH is also called the uplink DCI format. It is also called downlink assignment (DL assignment) or downlink allocation (DL allocation).

[0148] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format DCI formats such as DCI format 0_0 and DCI format 0_1 ​​are used. 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 and DCI format 1_1, etc.

[0149] DCI format 0_0 is used for scheduling PUSCH allocated to a certain cell. DCI format 0_0 is configured to include 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)

[0150] The DCI format specific field is a DCI format specific field. The DCI format specification field may indicate whether the format is an uplink DCI format or a downlink DCI format. That is, the DCI format specification field may be included in both the uplink DCI format and the downlink DCI format. Here, DCI format 0_0 The DCI format specific field included in may indicate 0.

[0151] The frequency domain resource allocation field included in DCI format 0_0 is It may also be used to indicate the allocation of frequency resources for PUSCH scheduled by metric 0_0.

[0152] The time domain resource allocation field included in DCI format 0_0 is It may also be used to indicate the allocation of time resources for PUSCH scheduled by mat0_0.

[0153] The frequency hopping flag field may be used to indicate whether frequency hopping is applied to the PUSCH scheduled by the DCI format 0_0. stomach.

[0154] The MCS field included in DCI format 0_0 is scheduled by that DCI format 0_0. The modulation scheme for the PUSCH to be scheduled and the DCI format 0_1 The target coding rate may be used to indicate one or both of the target coding rates for the transport blocks placed on the PUSCH. The size of the transport block (TBS) allocated to the PUSCH may be determined by the target coding rate and part of the modulation scheme for the PUSCH. Or it may be determined based on all of them.

[0155] DCI format 0_0 may not include a field used for a CSI request. DCI format 0_0 may not include a carrier indicator field. DCI format 0_0 may not include a BWP field.

[0156] DCI format 0_1 ​​is used for scheduling PUSCH allocated to a certain cell. DCI format 0_1 ​​is configured to include some or all of fields 2A to 2H. 2A) DCI format specific fields 2B) Frequency domain resource allocation field 2C) Time Domain Resource Allocation Field 2D) Frequency hopping flag field 2E) MCS Field 2F) CSI request field 2G) BWP field 2H) UL DAI field (downlink assignment index)

[0157] The DCI format specific field included in DCI format 0_1 ​​may indicate 0. .

[0158] The frequency domain resource allocation field included in DCI format 0_1 ​​is It may also be used to indicate the allocation of frequency resources for PUSCH scheduled by the metric 0_1.

[0159] The time domain resource allocation field included in DCI format 0_1 ​​is It may also be used to indicate the allocation of time resources for PUSCH scheduled by mat 0_1.

[0160] The MCS field included in DCI format 0_1 ​​is scheduled by that DCI format 0_1. The modulation scheme for the PUSCH to be scheduled and the DCI format 0_1 Used to indicate one or both of the target coding rates for the PUSCH being queued. It may be possible.

[0161] The CSI request field may be used to indicate the reporting of CSI.

[0162] The BWP field of DCI format 0_1 ​​is scheduled by the DCI format 0_1. It may be used to indicate the uplink BWP in which the PUSCH to be mapped is located. Format 0_1 ​​may or may not involve a change in the active uplink BWP. The terminal device 1 detects DCI format 0_1 ​​used for scheduling the PUSCH. Based on this, the uplink BWP in which the PUSCH is arranged may be recognized.

[0163] If the DCI format 0_1 ​​includes a carrier indicator field, the carrier indicator field indicates the uplink component carrier on which the PUSCH is arranged. The terminal device 1 may detect DCI format 0_1 ​​in the downlink component carrier of a serving cell and determine whether the PUSCH scheduled by the DCI format 0_1 ​​is included in the DCI format 0_1. It may be appreciated that the UE may be located on the uplink component carrier of the serving cell as indicated by the carrier indicator field included in the UE.

[0164] If DCI format 0_1 ​​does not include a carrier indicator field, The serving cell to which the uplink component carrier on which the PUSCH scheduled by the DCI format 0_1 ​​is allocated belongs is a serving cell to which the PDCCH including the DCI format 0_1 ​​is allocated. The terminal device 1 may use a DCI format in a certain downlink component carrier of a certain serving cell. Based on detecting DCI format 0_1, it may be recognized that the PUSCH scheduled by the DCI format 0_1 ​​is to be allocated to the uplink component carrier of the serving cell.

[0165] The UL DAI field is at least used to indicate the transmission status of the PDSCH. When a dynamic HARQ-ACK codebook is used, the size of the UL DAI field may be 2 bits. The UL DAI field indicates the size of the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the size of the HARQ-ACK codebook transmitted in the PUSCH. In the HARQ-ACK codebook transmitted on the HCH, this indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACK is included.

[0166] The UL DAI field may indicate a value to which a modulo operation has been applied. An example in which the UL DAI field is 2 bits will be described. If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 0, the UL DAI field indicates "00". The HARQ-ACK codebook transmitted on the PUSCH includes the corresponding HARQ-ACK. If the number of PDSCHs that include the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted on the PUSCH is 2, the UL DAI field is set to "01". If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is three, the UL DAI field is set to "11". The number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 5, the UL DAI field is set to "00". In this example, the UL DAI field is set to "01". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 6, "10" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 7, "11" is indicated as the UL DAI field. In this example, the number "4" is indicated as the UL DAI field for the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH. A modulo operation using ' is performed.

[0167] The terminal device 1 interprets the UL DAI field taking into account the total number of received PDSCHs. For example, the terminal device 1 receives four PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH, which is indicated in the UL DAI field, is four. For example, the terminal device 1 receives three PDSCHs and the UL DAI field indicates “00”. In this case, the terminal device 1 receives the PUSCH signal indicated by the UL DAI field. The number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook is interpreted as four, and it is determined that reception of one PDSCH has been missed.

[0168] DCI format 1_0 is used for scheduling PDSCH allocated to a certain cell. DCI format 1_0 is composed of some or all of 3A to 3F. 3A) DCI Format Specific Fields 3B) Frequency domain resource allocation field 3C) Time Domain Resource Allocation Field 3D) MCS field 3E) PDSCH_HARQ feedback timing indicator field 3F) PUCCH resource indicator field

[0169] The DCI format specific field included in DCI format 1_0 may indicate 1. .

[0170] The frequency domain resource allocation field included in DCI format 1_0 is 1 shows the allocation of frequency resources for PDSCH scheduled by the LTE. It may also be used for

[0171] The time domain resource allocation field included in DCI format 1_0 is To show the allocation of time resources for PDSCH scheduled by the It may also be used for

[0172] The MCS field included in DCI format 1_0 may be used to indicate one or both of the modulation scheme for the PDSCH scheduled by the DCI format and the target coding rate for the PDSCH scheduled by the DCI format. The target coding rate is the target for the transport blocks placed on the PDSCH. The size of the transport block (TBS) allocated to the PDSCH may be determined based on the target coding rate and the modulation scheme for the PDSCH. It may be determined based on one or both of the above.

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

[0174] The PDSCH_HARQ feedback timing indication field indicates the timing of the PDSCH-to-HARQ feedback. This 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] DCI format 1_1 is used for scheduling PDSCH allocated to a certain cell. DCI format 1_1 is composed of some or all of 4A to 4I. 4A) DCI Format Specific Fields 4B) Frequency domain resource allocation field 4C) Time Domain Resource Allocation Field 4E) MCS Field 4F) PDSCH_HARQ feedback timing indication field 4G) PUCCH resource indication field 4H) BWP Field 4I) Career Indicator Field

[0177] The DCI format specific field included in DCI format 1_1 may indicate 1 .

[0178] The frequency domain resource allocation field included in DCI format 1_1 is It may also be used to indicate the allocation of frequency resources for the PDSCH scheduled by the mobile station 1_1.

[0179] The time domain resource allocation field included in DCI format 1_1 is It may also be used to indicate the allocation of time resources for the PDSCH scheduled by mat 1_1.

[0180] The MCS field included in DCI format 1_1 is scheduled by the DCI format 1_1. The modulation scheme for the PDSCH to be scheduled and the DCI format 1_1 Used to indicate one or both of the target coding rates for the PDSCH being enumerated. It may be possible.

[0181] If DCI format 1_1 includes a PDSCH_HARQ feedback timing indication field, the PDSCH_HARQ feedback timing indication field is set to the last OFDM sequence of the PDSCH. From the slot containing the first OFDM symbol to the slot containing the first OFDM symbol of PUCCH If DCI format 1_1 does not include the PDSCH_HARQ feedback timing indication field, the last OFDM symbol of the PDSCH is included. This indicates the offset from the slot containing the first OFDM symbol of the PUCCH to the slot containing the first OFDM symbol of the PUCCH. The parameters may be provided by the RRC layer.

[0182] The PUCCH resource indication field may be used to indicate the resource of the PUCCH.

[0183] The BWP field of DCI format 1_1 is scheduled by the DCI format 1_1. It may be used to indicate the downlink BWP where the PDSCH to be mapped is located. Format 1_1 may or may not involve a change in the active downlink BWP. The terminal device 1 detects DCI format 1_1 used for scheduling the PDSCH. Based on this, the downlink BWP in which the PDSCH is arranged may be recognized.

[0184] The DCI format 1_1 that does not include a BWP field may be a DCI format for scheduling a PDSCH without changing the active downlink BWP. The terminal device 1 detects the DCI format 1_1 that is used for scheduling a PDSCH and does not include a BWP field, and determines whether to switch the active downlink BWP. It may be possible to recognize that the PDSCH is received without switching.

[0185] When a carrier indicator field is included in DCI format 1_1, the carrier indicator field is used to indicate the serving cell of the downlink component carrier on which the PDSCH scheduled by the DCI format 1_1 is arranged. The terminal device 1 may detect the DCI format 1_1 in the downlink component carrier of a certain serving cell, and determine whether the PDSCH scheduled by the DCI format 1_1 is included in the carrier indicator included in the DCI format 1_1. It may be appreciated that the UE is deployed on the downlink component carrier of the serving cell indicated by the field.

[0186] If DCI format 1_1 does not include a carrier indicator field, The downlink component carrier on which the PDSCH scheduled by the DCI format 1_1 is arranged is the downlink component carrier on which the PDCCH including the DCI format 1_1 is arranged. The terminal device 1, based on detecting DCI format 1_1 in a certain downlink component carrier, recognizes that the PDSCH scheduled by the DCI format 1_1 is to be allocated to the downlink component carrier. You may recognize it.

[0187] A downlink grant is used for scheduling one PDSCH in one serving cell. The downlink grant is at least used for scheduling the PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling the PDSCH in a slot different from the slot in which the downlink grant is transmitted. It is used for scheduling at least one PUSCH in the serving cell.

[0188] Note that various DCI formats contain additional fields other than those mentioned above. A field indicating the cumulative number of transmitted PDCCHs (C-DAI: Counter Downlink Assignment Index field) may be included. A field indicating the total number of transmitted PDCCHs (T-DAI: Total Downlink Assignment Index field) may be included.

[0189] 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 receives the PDSCH in which the transport block is allocated. Good too.

[0190] 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 wireless 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)

[0191] 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 includes a PSS (Primary Synchronization Signal) and and SSS (Secondary Synchronization Signal).

[0192] The SS block (SS / PBCH block) contains at least some or all of the PSS, SSS, and PBCH. It is composed of at least

[0193] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0194] The PBCH for which a PBCH symbol is transmitted in a certain antenna port is a DMRS for the PBCH that is arranged in a slot to which the PBCH is mapped, and is a SS / PBCH block including the PBCH. The PBCH may be estimated by the DMRS for the PBCH included in

[0195] DL DMRS is the sum of DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH. It is a title.

[0196] The set of antenna ports for DMRS for PDSCH (DMRS related to PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) is given 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.

[0197] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. A set of resource elements on which a DMRS symbol is transmitted and the DMRS symbol for the PDSCH are transmitted. When a set of resource elements on which symbols of a PDSCH are transmitted is included in the same precoding resource group (PRG), the PDSCH on which the symbols of the PDSCH are transmitted for an antenna port may be estimated by the DMRS for the PDSCH.

[0198] 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.

[0199] The propagation path of a PDCCH may be estimated from the DMRS for that PDCCH. A set of resource elements on which a DMRS symbol is transmitted and the symbol of the DMRS for the PDCCH are If the same precoder is applied (or is assumed to be applied, or is assumed to be applied) in the set of resource elements on which symbols of a PDCCH are transmitted, the PDCCH on which a symbol of the PDCCH on a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

[0200] The BCH (Broadcast CHannel), the UL-SCH (Uplink-Shared CHannel), and the DL-SCH (Downlink-Shared CHannel) are transport channels.

[0201] The BCH of the transport layer may be mapped to the PBCH of the physical layer. The transport blocks delivered from higher layers on the BCH of the transport layer are mapped to the PBCH of the physical layer. The UL-SCH of the transport layer may also be mapped to the PUSCH of the physical layer. stomach.

[0202] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0203] BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, BCCH uses MIB. The CCCH may be used to deliver an RRC message including RRC parameters common to multiple terminal devices 1, 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 to deliver an RRC message including RRC parameters common to multiple terminal devices 1, for example. The DCCH may also be used for RRC messages dedicated to a certain terminal device 1. Here, the DCCH may be used to transmit messages, for example, when an RRC connection is established. It may also be used for the terminal device 1.

[0204] The BCCH may be mapped to the BCH or DL-SCH. RRC messages containing system information other than MIB may be delivered on the BCH. In addition, CCCH is mapped to either DL-SCH or UL-SCH. In other words, RRC messages mapped to CCCH may be delivered on either DL-SCH or UL-SCH. In addition, the DCCH may be mapped to either the DL-SCH or the UL-SCH, i.e., an RRC message mapped to the DCCH may be delivered on either the DL-SCH or the UL-SCH.

[0205] The UL-SCH may be mapped to the PUSCH. The DL-SCH may be mapped to the PDSCH. BCH may be mapped to the PBCH.

[0206] The medium access control layer processing unit 15 may implement a random access procedure.

[0207] 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).

[0208] One physical channel may be mapped to one serving cell. One physical channel may be mapped to one BWP configured on one carrier included in one serving cell. It may be possible to

[0209] The terminal device 1 has one or more control resource sets (CORESET: Control Resource SET). The terminal device 1 may set a 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 The PDCCH monitoring may also include a set of PDCCH and / or PDCCH candidates. and / or monitoring and detecting the DCI format transmitted via the PDCCH.

[0210] 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.

[0211] The set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. The set of candidates is given by the search space.

[0212] 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 be determined by the number of CCEs constituting the PDCCH. The PDDCH candidates may be mapped to one or more CCEs.

[0213] 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.

[0214] 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. Each search space set may be given an index of the control resource set associated with that search space set.

[0215] The terminal device 1 performs blind search for PDCCH candidates included in a search space in a control resource set. By transmitting the PDCCH and / or DCI for the terminal device 1, it is possible to detect the PDCCH and / or DCI for the terminal device 1.

[0216] 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.

[0217] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto the PUCCH and transmit the UCI. The terminal device 1 may multiplex the UCI onto the PUSCH and transmit the UCI. 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).

[0218] HARQ-ACK is also known 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. It may also be called.

[0219] If the data is successfully decoded, an ACK is generated for the data. If the data is not decoded correctly, a NACK is generated for the data. The HARQ-ACK may include at least HARQ-ACK bits corresponding to at least one transport block. The HARQ-ACK bits may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. The HARQ-ACK may be generated using a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or more transport blocks may mean that the HARQ-ACK bit corresponds to a PDSCH including the one or more transport blocks.

[0220] HARQ control for one transport block may be called an HARQ process. One HARQ process identifier may be assigned to each HARQ process. It includes a field indicating a process identifier (HARQ process number).

[0221] An NDI (New Data Indicator) is indicated in a DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) that includes 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 detects the NDI field of the 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 receives the HARQ process identifier field of the detected DCI format. For the HARQ process corresponding to the value, the stored NDI value is updated using the NDI field of the detected DCI format.

[0222] The terminal device 1 receives the data based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 determines whether the received transport block is a new transmission or a retransmission. ... When the base station device 3 transmits a transport block for new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and transmits the toggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the base station device 3 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for a transport block of a certain HARQ process, it determines that the received transport block is a newly transmitted one. If it has not been toggled (if it is the same), it is determined that the received transport block is a retransmission. Note that toggling here means switching to a different value.

[0223] The terminal device 1 transmits HARQ-ACK information in a slot indicated by the value of the HARQ indication field included in DCI format 1_0 or DCI format 1_1 corresponding to PDSCH reception. may be reported to the base station device 3 using a HARQ-ACK codebook.

[0224] For DCI format 1_0, the value of the HARQ indication field may be mapped to a set of slot numbers (1, 2, 3, 4, 5, 6, 7, 8). For DCI format 1_1, the value of the HARQ indication field may be mapped to a set of slot numbers (1, 2, 3, 4, 5, 6, 7, 8) given by the higher layer parameter dl-DataToUL-ACK. The number of slots indicated based at least on the value of the HARQ indication field may also be referred to as HARQ-ACK timing or K1. For example, the HARQ-ACK indicating the decoding status of the PDSCH (downlink data) transmitted in slot n is mapped to a set of slots n. It may be reported (transmitted) in block n+K1.

[0225] dl-DataToUL-ACK indicates a list of timings of HARQ-ACK for PDSCH. The timing is the slot in which HARQ-ACK for the received PDSCH is transmitted, based on the slot in which the PDSCH is received (or the slot containing the last OFDM symbol to which the PDSCH is mapped). For example, dl-DataToUL-ACK can be 1, 2, or 3. If DL-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bit. If DL-DataToUL-ACK is a list of two timings, the HARQ indication field The field is 1 bit. If Dl-DataToUL-ACK is a list of 3 or 4 timings, If there are 5 or 6 DL-DataToUL-ACKs, or For example, dl-DataToUL-ACK can be selected from a list of timings with a value between 0 and 31. For example, dl-DataToUL-ACK is a timing value between 0 and 63. It consists of a list of tags.

[0226] The size of the dl-DataToUL-ACK is defined as the number of elements it contains. para The index of dl-DataToUL-ACK indicates the order (number) of the elements of dl-DataToUL-ACK. For example, if the size of dl-DataToUL-ACK is 8 (L para = 8), the indices of dl-DataToUL-ACK are 1, 2, 3, 4, The value is either 5, 6, 7, or 8. The index of dl-DataToUL-ACK is It may be given, indicated, or indicated by the value indicated by the indication field.

[0227] The terminal device 1 may set the size of the HARQ-ACK codebook according to the size of the dl-DataToUL-ACK. For example, if the dl-DataToUL-ACK consists of eight elements, the size of the HARQ-ACK codebook is 8. For example, if the dl-DataToUL-ACK consists of two elements, the size of the HARQ-ACK codebook is 2. Each HARQ-ACK information that constitutes the HARQ-ACK codebook is HARQ-ACK information for PDSCH reception at each slot timing of the dl-DataToUL-ACK. This type The HARQ-ACK codebook for this group is the semi-static HARQ-ACK codebook ) is also called.

[0228] The terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n by transmitting a PUCCH and / or a PUSCH in slot n+k, where k is the number of PDSCHs for the PDSCH reception. of the slot indicated by the HARQ indication field included in the corresponding DCI format. Alternatively, if the HARQ indication field is not included in the DCI format, k may be given by the higher layer parameter dl-DataToUL-ACK.

[0229] The terminal device 1 transmits corresponding HARQ-ACK information in the PUCCH of a certain slot. The terminal device 1 determines a set of multiple opportunities for candidate PDSCH reception. The terminal device 1 determines a set of multiple slots of slot timing K1 included in dl-DataToUL-ACK as multiple opportunities for candidate PDSCH reception. K1 may be a set of k. For example, if dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), the PUCCH in slot n receives the PDSCH in slot n-1, and the PDSCH in slot n-2. HARQ-ACK information is transmitted for PDSCH reception in slot n-1, PDSCH reception in slot n-2, PDSCH reception in slot n-3, PDSCH reception in slot n-4, PDSCH reception in slot n-5, PDSCH reception in slot n-6, PDSCH reception in slot n-7, and PDSCH reception in slot n-8. When a PDSCH is actually received in a slot corresponding to candidate PDSCH reception, the terminal device 1 sets ACK or NACK as the HARQ-ACK report based on the transport block included in that PDSCH, and when a PDSCH is not received in a slot corresponding to candidate PDSCH reception, sets NACK as the HARQ-ACK information. do.

[0230] The HARQ-ACK codebook may be based on at least some or all of the set of monitoring occasions for PDCCH, the value of the counter DAI field, etc. The HARQ-ACK codebook may be given based on the value of the UL DAI field. The HARQ-ACK codebook may be given based on the value of the DAI field. The credit may be given based on the value of the Total DAI field.

[0231] The size of the HARQ-ACK codebook is determined by the counter DAI frame of the last received DCI format. The Counter DAI field may be set based on the value of the DCI format field. The Counter DAI field is set based on the cumulative count of the PDSCH or transport block scheduled until the reception of the corresponding DCI format. The size of the HARQ-ACK codebook is the total DAI field of the DCI format. The Total DAI field indicates the total number of PDSCHs or transport blocks scheduled until the transmission of the HARQ-ACK codebook.

[0232] The terminal device 1 determines a set of PDCCH monitoring opportunities for HARQ-ACK information transmitted in a PUCCH arranged in a slot of index n (slot #n) based on the value of timing K1 and the slot The PDCCH monitoring for HARQ-ACK information transmitted in a PUCCH located in a slot with index n may be determined based at least in part or in whole on the value of the slot offset K0. The set of monitoring occasions is also referred to as a set of PDCCH monitoring occasions for slot n (monitoring occasion for PDCCH for slot #n). Here, the set of PDCCH monitoring occasions includes M PDCCH monitoring occasions. For example, the slot offset K0 may be indicated based at least on the value of a time domain resource allocation field included in a downlink DCI format. The slot offset K0 is a value indicating the number of slots (slot difference) from the slot including the last OFDM symbol in which a PDCCH including a DCI format including a time domain resource allocation field indicating the slot offset K0 is arranged to the first OFDM symbol of a PDSCH scheduled by the DCI format.

[0233] A PDCCH signal detected in a monitoring opportunity of any of the search space sets corresponding to a certain PDCCH monitoring opportunity is If a DCI format detected in a monitoring opportunity of a search space set corresponding to a certain PDCCH monitoring opportunity triggers (contains triggering information) transmission of HARQ-ACK information in slot n, the terminal device 1 may determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n. Also, if a DCI format detected in a monitoring opportunity of a search space set corresponding to a certain PDCCH monitoring opportunity does not trigger (contains triggering information) transmission of HARQ-ACK information in slot n, the terminal device 1 may determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n. The monitoring opportunity does not have to be determined as the PDCCH monitoring opportunity for slot n. No DCI format is detected in the monitoring opportunity for the search area set corresponding to the monitoring opportunity In this case, the terminal device 1 does not need to determine the PDCCH monitoring opportunity as the PDCCH monitoring opportunity for slot n.

[0234] Counter DAI may be a cumulative number (or a value at least related to the cumulative number) of PDCCHs detected up to a PDCCH monitoring opportunity in a serving cell among M PDCCH monitoring opportunities. Counter DAI may also be referred to as C-DAI. The C-DAI corresponding to a PDSCH may be indicated by a field included in the DCI format used for scheduling the PDSCH. The total DAI is the sum of the number of PDCCH monitoring opportunities up to PDCCH monitoring opportunity m among M PDCCH monitoring opportunities. The cumulative number of PDCCHs detected in The total DAI is called T-DAI (Total Downlink Assignment Index). This may be done.

[0235] Physical signal is also a general term for sidelink physical channel and sidelink physical signal. Physical channel is also a general term for sidelink physical channel. It is also a general term for link physical signals.

[0236] 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) ·PSFCH (Physical Sidelink Feedback CHannel)

[0237] The PSBCH includes the DFN (Direct Frame Number), TDD UL-DL configuration, slot index (the slot index of the slot where the PSBCH is placed), and in-coverage indicator. The base station device 3 transmits the received data (an identifier indicating whether the transmitting terminal device 1 is located within the coverage of the base station device 3).

[0238] The PSCCH is used to transmit (transmit) sidelink control information (SCI). ) Sidelink control information may be placed in the PSCCH. The terminal device 1 may receive the PSCCH in which the sidelink control information is arranged. 1 may transmit a PSCCH in which sidelink control information is configured.

[0239] 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 The SCI transmitted and received on the PSSCH is called the 2 stage SCI. nd This is called stage 1 SCI. 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 ndA field indicating the stage SCI format (SCI format 2-A, SCI format 2-B, SCI format 2-C), a beta offset (2 nd A field indicating the number of DM RS ports. field, field indicating MCS, field indicating MCS table, PSFCH overhead If the higher layer parameter transmissionStructureForPSSCHandPSSCH is set to Sidelink BWP, the COT sharing flag field may be included in SCI format 1-A.

[0240] 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, and cast type indicator (unicast). SCI format 2-B includes information on HARQ process number, NDI, RV, Source ID, Destination ID, HARQ feedback Contains information on enable / disable indicator, Zone ID, and communication range request.

[0241] PSSCH carries sidelink data (sidelink transport blocks, sidelink PDUs), nd The PSSCH may be transmitted to carry sidelink data, 2 nd The terminal device 1 may transmit the sidelink data. Ta, 2 ndThe terminal device 1 may transmit the sidelink data, the PSSCH in which the stage SCI is arranged. nd A PSSCH in which a stage SCI is arranged may be received.

[0242] The PSFCH may be used to transmit HARQ-ACK information corresponding to PSSCH reception. The terminal device 1 may transmit a PSFCH in which HARQ-ACK information is arranged. A PSFCH in which information is placed may be received.

[0243] The sidelink physical signal may correspond to a set of resource elements. The sidelink physical signal may not be used to convey information generated in a higher layer. The sidelink physical signal may be used to convey 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) Side link DM RS Sidelink CSI-RS Side link PT-RS

[0244] 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 S-PSS (Sidelink Primary Synchronization Signal) and the S-SSS (Sidelink Secondary Synchronization Signal).

[0245] 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 set to the transmitting terminal device 1. The time domain patterns of the selection candidates are configured for each resource pool.

[0246] The sidelink CSI-RS is a reference signal used for sidelink channel measurement. It includes time resource allocation (symbol positions where the CSI-RS is 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.

[0247] Sidelink PT-RS may be supported only in the high frequency band (FR2). The time density and frequency density of sidelink PT-RS are configured for each resource pool.

[0248] A signal for AGC (Access Gain Control) may be used. It may be placed in the first OFDM symbol of the first slot, the second slot, etc.

[0249] The terminal device 1 may use the uplink PUCCH to report information about the sidelink HARA-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.

[0250] 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 Sub-channel 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

[0251] The resource pool index indicates the resource pool to be used for the scheduled PSCCH and PSSCH. The time gap indicates the time from when DCI format 3_0 is received until sidelink transmission is performed. The subchannel allocation information indicates the subchannel to be used for the scheduled PSCCH and PSSCH. The SCI format 1_A field indicates the subchannel to be used when the terminal device 1 transmits 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 uses PUCCH to feed back HARQ-ACK information acquired by receiving PSFCH from the counterpart terminal device 1. The PUCCH resource indicator indicates the PUCCH resource used for feeding back HARQ-ACK information acquired by receiving PSFCH. The configuration index indicates the configuration of the sidelink configured grant. The sidelink allocation index counter indicates the number of sidelink allocations that the base station device 3 has allocated to the terminal device 1 within a certain period.

[0252] To use unlicensed spectrum, certain restrictions must be met. For example, according to the regulations of the European Telecommunications Standards Institute (ETSI), 5 GHz, which is one of the unlicensed spectrum, Regarding the use of the OCB, the occupied channel bandwidth (OCB) containing 99% of the signal power must be 80% or more of the available bandwidth (e.g., system bandwidth, LBT sub-band bandwidth, sub-band bandwidth). Also, there are restrictions on the maximum transmit power density (Power Spectral Density (PSD)) per given bandwidth (1 MHz). is stipulated.

[0253] To meet such constraints (e.g., OCB regulations), unlicensed carriers Transmission (interlaced transmission) is performed using a set of multiple frequency domain resources (also referred to as an interlace, RB set, etc.) at a predetermined frequency interval. One interlace may be defined as a set of multiple frequency domain resources allocated at a predetermined frequency interval (for example, 10 RB interval).

[0254] Fig. 5 is a diagram showing an example of interlace mapping according to one aspect of this embodiment. Here, a case where the total available bandwidth is 20 MHz and there are 100 RBs will be described. Interlace #i is made up of 10 RBs with index values ​​{i, i+10, i+20, ..., i+90}. One interlace is made up of multiple RBs spaced at a frequency interval of 10 RBs. When the total available bandwidth is 20 MHz, 10 interlaces #0-#9 are provided.

[0255] In FIG. 5, the case where the subcarrier spacing is 15 kHz has been described, but if the subcarrier spacing is 30 kHz, the frequency spacing of the resource blocks that make up the interlaces may be different. A 20 MHz bandwidth is made up of 50 RBs, and one interlace is made up of 10 RBs. In this case, there are five interlaces, #0-#4. In this case, interlace #i is It consists of 10 RBs with index values ​​{i, i+5, i+10, ..., i+45}. A grid is made up of multiple RBs spaced at a frequency interval of 5 RBs.

[0256] A subchannel may consist of one or more interlaces. Subchannel indexes and interlace indexes may correspond to each other in ascending order.

[0257] FIG. 6 shows an arrangement of PSCCHs monitored in a terminal device 1 according to one aspect of this embodiment. One slot consists of 14 OFDM symbols (#0, #1, #2, #3, #4, #5, #6). , #7, #8, #9, #10, #11, #12, #13). Figure 6(a) shows the case where the PSCCH is monitored in the second OFDM symbol (#1). The PSCCH is monitored in a specific subchannel of the second OFDM symbol (for example, the subchannel with the smallest subchannel index). When the terminal device 1 detects the PSCCH, it receives the PSSCH on another subchannel of the second OFDM symbol, and receives the PSSCH and DM RS on the third and subsequent OFDM symbols. ) indicates the case where the PSCCH is monitored in the second and third OFDM symbols (#1, #2). The PSCCH is monitored in a specific subchannel (for example, the subchannel with the smallest subchannel index) of the second and third OFDM symbols. When the terminal device 1 detects the PSCCH, it receives the PSSCH in other subchannels of the second and third OFDM symbols. It receives the PSSCH and DM RS in the fourth and subsequent OFDM symbols. Note that in FIG. 6(b), it is intended to monitor one PSCCH in the second and third OFDM symbols, and two PSCCHs are monitored. It is not intended to be monitored.

[0258] FIG. 7 shows an arrangement of PSCCHs monitored in a terminal device 1 according to one aspect of this embodiment. 7(a) shows an example of a PSCCH configuration. One slot consists of 14 OFDM symbols (#0, #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12, #13). FIG. 7(a) shows a case where the PSCCH is monitored in a maximum of the second OFDM symbol (#1) and the ninth OFDM symbol (#8). A specific subchannel (e.g., subchannel index) of the second OFDM symbol is monitored. If the terminal device 1 can detect the PSCCH in the second OFDM symbol, it receives the PSSCH in another subchannel of the second OFDM symbol. Then, PSSCH and DM RS are received in the third and subsequent OFDM symbols, and PSCCH is received in the ninth OFDM symbol. If the terminal device 1 cannot detect the PSCCH in the second OFDM symbol, it monitors the PSCCH in a specific subchannel of the ninth OFDM symbol. If the terminal device 1 can detect the PSCCH in the ninth OFDM symbol, it monitors the PSCCH in another subchannel of the ninth OFDM symbol. and receives PSSCH and DM RS in the 10th and subsequent OFDM symbols.

[0259] FIG. 7(b) shows the case where the PSCCH is monitored at most in the second and third OFDM symbols (#1, #2) and the ninth and tenth OFDM symbols (#8, #9). The PSCCH is monitored in a specific subchannel of the channel (for example, the subchannel with the smallest subchannel index). If the terminal device 1 can detect the PSCCH in the second and third OFDM symbols, it receives the PSSCH in other subchannels of the second and third OFDM symbols, receives the PSSCH and DM RS in the fourth and subsequent OFDM symbols, and does not monitor the PSCCH in the ninth and tenth OFDM symbols. If the terminal device 1 cannot detect the PSCCH in the second and third OFDM symbols, When the terminal device 1 detects the PSCCH in the ninth and tenth OFDM symbols, it receives the PSSCH in other subchannels of the ninth and tenth OFDM symbols, and receives the PSSCH and DM RS in the eleventh and subsequent OFDM symbols. Note that in FIG. 7(b), it is intended to monitor one PSCCH in the second and third OFDM symbols, and it is not intended to monitor two PSCCHs. It should be noted that in FIG. 7(b), it is intended to monitor one PSCCH in the ninth and tenth OFDM symbols, and not to monitor two PSCCHs.

[0260] Before transmitting a signal (channel access), the terminal device 1 senses the channel (carrier sense) to check whether other devices (e.g., base station device, terminal device, WiFi terminal device, WiFi access point, etc.) are transmitting. After transmitting the previous signal, the terminal device 1 randomly sets the backoff counter value within the range of the contention window size (CWS). The terminal device 1 waits until it confirms that the channel (LBT subband, RB set, for example, a band with a bandwidth of 20 MHz) is idle, and performs carrier sensing at each sensing slot time. The RB set may be composed of multiple resource blocks. The RB set may be a unit used for allocating resources for sidelink transmission. The RB set is used for the PS An RB set may be a unit of frequency used for CCH / PSSCH transmission. An RB set may be a unit of frequency used for PSFCH transmission. An RB set is a unit of frequency used for S-SSB transmission. If the channel is idle, the terminal device 1 sequentially decreases a counter value that is randomly determined within the contention window size (CWS), and after the counter value reaches 0, it obtains access to the channel and transmits a signal. After completing signal transmission, the terminal device 1 that performs communication using HARQ-ACK feedback updates the contention window size based on the HARQ-ACK feedback received from the terminal device 1 to which the signal is transmitted. If the status of the HARQ-ACK is ACK, the terminal device 1 updates the contention window size. The terminal device 1 sets the contention window size to the minimum value. If the status of the HARQ-ACK is NACK, the terminal device 1 sets the contention window size to the next largest value. If the contention window size reaches the maximum value that can be set, the terminal device 1 continues to use the maximum value even if the status of the HARQ-ACK is NACK.

[0261] The terminal device 1 determines whether a transmission opportunity (Transmission Opportunity : TxOP (Channel Occupancy) is acquired and transmission is performed, and if the LBT result is busy (LBT-busy), transmission is not performed. The time of the transmission opportunity is called Channel Occupancy Time (COT). The LBT for acquiring COT may be called Type 1 channel access procedure. The Type 1 channel access procedure is Type 1 LBT The COT may be referred to as the total time between all transmissions within a transmission opportunity and gaps within a given time. The length of the channel access priority class may be less than or equal to the maximum COT (MCOT). The MCOT may be determined based on the channel access priority class. The channel access priority class may be associated with a contention window size. The Type 1 channel access procedure performed for this purpose may be referred to as a Type 1 SL channel access procedure. The Type 1 SL channel access procedure may be referred to as a Type 1 SL LBT. The Type 1 channel access procedure may be channel sensing to obtain a COT.

[0262] The Type 1 SL channel access procedure may be a channel access procedure by the terminal device 1 when the duration of the sensing slot detected as idle before the sidelink transmission is random. The Type 1 SL channel access procedure may be applied to sidelink transmissions including at least one of the PSCCH / PSSCH, PSFCH, or S-SSB. The terminal device 1 detects that the channel is idle during the sensing slot period of the defer section. After first detecting that a channel is present, and in the fourth step of the Type 1 channel access procedure After the counter N reaches 0, the terminal device 1 may perform transmission. As the first step of the Type 1 channel access procedure, the terminal device 1 may set the counter N to an initial counter N. The initial counter N is set randomly from 0 to the contention window size. The terminal device 1 may be a selected value. After step 1, the terminal proceeds to step 4 of the Type 1 channel access procedure. As a second step of the Type 1 channel access procedure, if the value of counter N is greater than 0, terminal device 1 decrements the value of counter N by 1. As a third step of the Type 1 channel access procedure, terminal device 1 senses the channel for an additional sensing slot, and if the channel is idle during the additional sensing slot, it performs Type 1 channel access. The terminal device 1 senses the channel for the additional sensing slots in the third step of the Type 1 channel access procedure, and if the channel is not idle for the additional sensing slots, the terminal device 1 proceeds to the fourth step of the Type 1 channel access procedure. If the value of counter N is not 0 in the fourth step of the Type 1 channel access procedure, the terminal device 1 may stop the Type 1 channel access procedure. If the value of counter N is not 0 in the fourth step of the Type 1 channel access procedure, the terminal device 1 may stop the Type 1 channel access procedure. The terminal device 1 proceeds to the second step of the Type 1 channel access procedure. As the fifth step of the Type 1 channel access procedure, the terminal device 1 performs busy sensing within the additional defer interval. If a slot is detected or all sensing slots in the additional defer interval are idle, If the terminal device 1 detects that the channel is idle during all sensing slots of the additional defer interval as the sixth step of the Type 1 channel access procedure, the terminal device 1 proceeds to the fourth step of the Type 1 channel access procedure. If the terminal device 1 detects that the channel is idle during all sensing slots of the additional defer interval as the sixth step of the Type 1 channel access procedure, the terminal device 1 proceeds to the fourth step of the Type 1 channel access procedure. If the device is not detected as a quasi-dialogue device, the fifth step of the Type 1 channel access procedure is performed. The terminal device 1 proceeds to the first step of the Type 1 channel access procedure. The Type 1 SL channel access procedure may be referred to as the Type 1 channel access procedure. The Type 1 channel access procedure may be channel sensing to start COT.

[0263] Sensing may be performed in units of 9 μs sensing slots. During sensing of the channel in a sensing slot period, if the detected power is less than a threshold for at least 4 μs within the sensing slot period, the channel may be determined to be idle. If sensing of the channel in a sensing slot period does not result in the channel being idle, the channel may be determined to be busy.

[0264] Channel access priority classes are defined and used. For example, four channel access priority classes (channel access priority class 1, channel access priority class 2, channel access priority class 3, and channel access priority class 4) are defined and used. In channel access priority class 1, the minimum contention window size is 3 slots, the maximum contention window size is 7 slots, and the allowed contention window size is 10 ... There are two contention window sizes: 3 slots and 7 slots. For channel access priority class 2, the minimum contention window size is 7 slots and the maximum contention window size is 10 slots. The channel access priority class is 3, and the contention window size is 15 slots. The allowed contention window sizes are 7 slots and 15 slots. The minimum contention window size is 15 slots, the maximum contention window size is 1023 slots, and the allowed contention window sizes are {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. }. Channel access priority class 4 has the lowest contention rate. The contention window size is 15 slots, the maximum contention window size is 1023 slots, and there are seven allowed contention window sizes: {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. Note that the contention window size may also represent the number of counts per slot.

[0265] If the terminal device 1 determines that the channel is busy by carrier sensing during the sensing slot time, it senses whether the channel is idle in the defer interval. The defer interval consists of 16 us and multiple sensing slots. The number of sensing slots that make up the defer interval is determined by the channel. It depends on the channel access priority class. In channel access priority class 1, about two sensing slots are configured in the defer section. In priority class 2, two sensing slots are configured in the defer section. In access priority class 3, three sensing slots are configured in the defer section. In channel access priority class 4, about seven sensing slots are configured in the defer interval. If the terminal device 1 determines that the channel is busy in the defer interval, it determines again in a new defer interval whether the channel is idle. If it is determined that the channel is idle, it decrements the counter value set based on the contention window size, and continues to perform carrier sensing every sensing slot time to determine whether the channel is idle.

[0266] For example, for channel access priority class 1, a maximum COT of 2 ms is used. For example, for channel access priority class 2, a maximum COT of 4 ms is used. For example, for channel access priority class 3, the maximum COT is 6 ms. For example, for channel access priority class 3, a maximum COT of 10 ms is used. For example, for channel access priority class 4, a maximum COT of 6 ms is used. For example, for channel access priority class 4, A maximum COT of 10 ms is used.

[0267] In sidelink resource allocation mode 2, the terminal device 1 autonomously controls PSCCH / PSSCH transmission. The upper layer of the terminal device 1 requests the physical layer of the terminal device 1 to determine a resource set SA, and determines resources for PSCCH / PSSCH transmission from the multiple resource sets SA. The physical layer of the terminal device 1 determines the sidelink resource allocation. The physical layer of the terminal device 1 may be provided with parameters from a higher layer to determine a subset of resources to notify to a higher layer in sidelink resource allocation mode 2. The parameters provided from a higher layer to the physical layer include L1 priority prioTX. , remaining packet delay budget, subchannels used for PSCCH / PSSCH transmission in one slot The upper layer may be a terminal device. The upper layer may be a MAC layer higher than the physical layer of the terminal device 1. The upper layer may also be an RRC layer. The terminal device 1 may transmit a transport block using resources selected in sidelink resource allocation mode 2. The transport block is transmitted on the PSSCH. A transport block may be referred to as a MAC PDU. A MAC PDU may consist of one SL-SCH subheader and one or more MAC sub-PDUs. L1 priority may be the priority of PSSCH transmission.

[0268] L1 priority may be the priority indicated in the Priority field of SCI format 1-A. L1 priority may be the priority of PSSCH transmission. L1 priority may be the priority of PSCCH / PSSCH transmission. The NR PC5 priority level may have the same format and meaning as the LTE PC5 PPPP (Prose Per-Packet Priority) priority value. The PPPP value may reflect the LTE PC5 latency requirement and PDB (Packet Delay Budget). A lower PDB may be mapped to a higher priority PPPP value. The NR PC5 priority level may be associated with the PDB and PQI. The PDB may be derived from the PQI table. Priority level handles different V2X service data across different communication modes. The communication mode may be unicast, broadcast or groupcast. The terminal device 1 is associated with the PC5 reference point. If it is not possible to satisfy all QoS requirements for all PC5 service data received, the Priority level may be used to select which PC5 service data to prioritize in terms of QoS requirements. For example, a PC5 service data packet with a Priority level value of N may be prioritized over PC5 service data packets with a Priority level value of N+1 or N+2. The Priority level may also be referred to as L1 priority. V2X may be realized by V2V (Vehicle-to-Vehicle), V2P (Vehicle-to-Pedestrian), V2I (Vehicle-to-Infrastructure), and V2N (Vehicle-to-Network). PQI is a special 5QI and is used as a reference to PC5 QoS characteristics. The PQI may be referred to as PC5 QI. The standardized PQI value is The QoS characteristics may be mapped one-to-one to the combinations of the PC5 QoS characteristics.

[0269] The set SA that the physical layer of the terminal device 1 notifies the upper layer of the terminal device 1 is The set SA may be a set of resource candidates for PSCCH / PSSCH transmission. The set SA may include multiple resource candidates. The terminal device 1 selects the resource candidates for PSCCH / PSSCH transmission included in the set SA. The terminal device 1 may determine a reservation for another terminal device 1 to transmit a PSCCH / PSSCH. Resource candidates of the terminal device 1 that overlap with the reserved resources may be excluded from the set SA. Resources reserved by other terminal devices 1 for PSCCH / PSSCH transmission may be referred to as reserved resources of other terminal devices 1. Reserved resources may also be referred to as reserved resources. Resource candidates for PSCCH / PSSCH transmission may be referred to as candidate resources.

[0270] FIG. 8 is a diagram showing an example of a resource selection procedure in a resource pool in which a terminal device 1 according to an aspect of this embodiment is located. FIG. 8 shows a case where contiguous RBs are configured in a resource pool. The terminal device 1 may include any of the terminal devices 1A to 1D in FIG. 1. The other terminal device 1 may include any of the terminal devices 1A to 1D in FIG. 1. In FIG. 8, one horizontal square is one slot, and one vertical square is one sub-channel. Sub-channel #0 is , a subchannel in the resource pool with index 0. Slot#0 is the resource The slots belonging to the pool have an index of 0. In FIG. 8, for example, the number of subchannels L_subCH used for PSCCH / PSSCH transmission is set to 2. For example, In FIG. 8, the terminal device 1 may have two subchannels for one candidate resource in each slot within a time interval.

[0271] When the terminal device 1 triggers the resource selection procedure in slot n as the first step of the resource selection procedure, the time interval may be the period from slot n+T1 to slot n+T2. For example, in FIG. 8, slot 801 is the time interval in which the terminal device 1 triggers the resource selection procedure. In FIG. 8, the period 802 is a time interval. The time interval may be the duration of a candidate resource for PSCCH / PSSCH transmission. The terminal device 1 may determine a candidate resource by dividing consecutive subchannels equal to the number of L_subCHs in the slots of the resource pool within the time interval. In other words, one candidate resource may be defined as a set of consecutive resources, numbered as L_subCHs, starting from the index of a certain subchannel in a certain slot. The candidate resources may be indicated by a slot index and a subchannel starting index. For example, in FIG. 8, candidate resource 803 may be one of the candidate resources using sub-channel #0 and sub-channel #1 in slot #8. Candidate resource 804 may be one of the candidate resources using sub-channel #1 and sub-channel #2 in slot #8. Candidate resource 805 may be one of the candidate resources using sub-channel #0 and sub-channel #1 in slot #11. Candidate resource 806 may be one of the candidate resources using sub-channel #1 and sub-channel #2 in slot #11. Similarly, terminal device 1 may determine that there is a candidate resource using sub-channel #0 and sub-channel #1 in slot #9. The terminal device 1 may determine that there is a candidate resource using sub-channel #1 and sub-channel #2 in slot #9. The terminal device 1 may determine that there is a candidate resource using sub-channel #0 and sub-channel #1 in slot #10. The terminal device 1 may determine that there is a candidate resource using sub-channel #1 and sub-channel #2 in slot #10. The terminal device 1 may determine that there are a total of eight candidate resources within the time interval. The terminal device 1 may determine T1 in the range of 0 to Tproc1. Tproc1 is the number of slots. and is defined for each subcarrier spacing of the sidelink BWP. The terminal device 1 may determine T2 based on T2min and the remaining packet delay budget. For example, the terminal device 1 may If T2min is shorter than the remaining packet delay budget, T2 is set to T2min or more. The terminal device 1 may determine the packet delay within the range of the packet delay budget. If it is not shorter than the packet delay budget, the remaining packet delay budget is T2min may be set as the time from the RRC parameter sl-SelectionWindowList to the PSSCH A value corresponding to the transmission priority L1 priority prioTX may be determined. sl-SelectionWindowList is a list of parameters for determining the end of a time interval, The L1 priority and window size are set. The sl-SelectionWindowList may be included in the configuration information of the resource pool. The L1 priority prioTX is the PSCCH / PSSCH transmission window size of the terminal device 1. The terminal device 1 may set the number of all candidate resources in a time interval as M_total. For example, in FIG. 8, M_total is the number of candidate resources in one slot. Since there are two candidate resources in the time interval and the time interval period is four slots, the number of candidate resources is eight. For example, when L_subCH is 1, the terminal device 1 selects each slot in the time interval. In FIG. 8, one subchannel is one candidate resource. In FIG. 8, when L_subCH is 1, the terminal device 1 determines that there are three candidate resources in each slot. Since the terminal device 1 determines that there are three candidate resources in one slot and the time interval duration is four slots, M_total is 12. In other words, the first step of the resource selection procedure is a step for determining candidate resources within a time interval.

[0272] As a second step of the resource selection procedure, the terminal device 1 may define the range from slot n-T0 to slot n-Tproc0 as a sensing window. For example, in FIG. 8, Duration 807 may be the duration of the sensing window. T0 is the number of slots and may be determined based on the RRC parameter sl-SensingWindow. Tproc0 is used to determine the end of the sensing window and is determined by the subcarrier spacing of the sidelink BWP. The sl-SensingWindow is a parameter for determining the start of the sensing window and may be included in the configuration information of the resource pool. The terminal device 1 monitors slots belonging to the sidelink resource pool, excluding the slot in which the terminal device 1 itself has transmitted within the sensing window. In other words, the second step of the resource selection procedure is a step for defining the sensing window.

[0273] The terminal device 1 may determine the RSRP threshold as a third step of the resource selection procedure. In a sixth step, the terminal device 1 determines an RSRP threshold in order to exclude candidate resources based on the RSRP threshold. The terminal device 1 may determine the RSRP threshold for each of the PSSCH transmission priority L1 priority prioTX of the terminal device 1 and the PSSCH transmission priority L1 priority prioRX of the other terminal device 1 notified in the SCI. The sl-Thres-RSRP-List indicates a list of 64 types of thresholds, and the PSSCH transmission priority L1 priority prioTX of the terminal device 1 and the PSSCH transmission priority L1 priority prioRX of the other terminal device 1 notified in the SCI may be determined. The threshold to be used may be determined from the L1 priority prioRX. The sl-Thres-RSRP-List may be included in the resource pool configuration information. In other words, the third step of the resource selection procedure is the step for determining the RSRP threshold.

[0274] As a fourth step of the resource selection procedure, the terminal device 1 selects a set of candidate resources SA. , all candidate resources may be configured. In the fourth step of the resource selection procedure, The terminal device 1 defines the set SA to include all the candidate resources determined in the first step. That is, the fourth step of the resource selection procedure is a step for setting all the candidate resources determined in the first step in a set SA, which is a collection of candidate resources.

[0275] As a fifth step of the resource selection procedure, the terminal device 1 selects the Assume that the terminal device 1 itself transmits and receives SCI format 1-A in a slot that is not monitored within the sensing window. Then, the RRC Candidate resources belonging to slots on all periods of the parameter sl-ResourceReservePeriodList may be excluded from the set SA. The sl-ResourceReservePeriodList indicates a set of periods of reserved resources valid in the resource pool, and up to 16 values ​​may be set for each resource pool. The sl-ResourceReservePeriodList is the resource pool configuration information. For example, in FIG. 8, slot 808 is a slot that terminal device 1 monitors. The terminal device 1 receives SCI format 1-A in slot 808. Suppose that the resource is received from slot 808 on all periods in sl-ResourceReservePeriodList. In FIG. 8, sl-ResourceReservePeriodList indicates 8-period slots and 9-period slots. Slot 809 is a slot located 8 periods from slot 808. Terminal device 1 excludes candidate resources belonging to slot 809 from set SA. Slot 810 is a slot located 9 periods from slot 808. Terminal device 1 excludes candidate resources belonging to slot 810 from set SA. are excluded from the set SA. That is, the fifth step of the resource selection procedure is a step for eliminating candidate resources from the set SA by considering slots that are not monitored in the sensing window.

[0276] The terminal device 1 selects the candidate resources remaining in the set SA after the fifth step of the resource selection procedure. If the number of candidate resources is less than X·M_total, the set SA may contain all candidate resources determined in the first step. X is the number of candidate resources determined in the first step. X may indicate the percentage of candidate resources relative to the total number M_total. X may be configured by the RRC parameter sl-TxPercentateList. sl-TxPercentateList is the resource pool configuration information. The terminal device 1 maintains the candidate resources in the set SA if the number of candidate resources remaining in the set SA is equal to or greater than X·M_total. This step may be referred to as step 5a) of the resource selection procedure.

[0277] As the sixth step of the resource selection procedure, the terminal device 1 selects the received signal in the sensing window. The terminal device 1 determines the location of the reserved resource of the other terminal device 1 based on the resource reservation period field, the time domain resource allocation field, and the frequency domain resource allocation field of the SCI format 1-A of the other terminal device 1 that it has received. If the RSRP measurement value of the SCI format 1-A of the other terminal device 1 is higher than the set RSRP threshold, the terminal device 1 may exclude candidate resources that overlap with the reserved resource of the other terminal device 1 from the set SA. For example, in FIG. 8, resource 811 is the resource with which the terminal device 1 has received the SCI format 1-A of the other terminal device 1 on sub-channel #1 in slot #3 within the sensing window. The terminal device 1 determines the location of the reserved resource of the other terminal device 1 based on the resource reservation period field, the time domain resource allocation field, and the frequency domain resource allocation field of the SCI format 1-A of the other terminal device 1 that it has received on resource 811. The location of the reserved resource of the other terminal device 1 may be determined from the SCI format 1-A received in resource 811. Resource 812 is the reserved resource of the other terminal device 1 indicated by the SCI format 1-A received in resource 811. Resource 812 is the reserved resource of the other terminal device 1 present in sub-channel #0 of Slot #11. When the terminal device 1 determines that the RSRP measurement value of the SCI format 1-A of the other terminal device 1 received in resource 811 is higher than the set RSRP threshold, it excludes the candidate resource 805 that overlaps with the reserved resource 812 of the other terminal device 1 from the set SA. Resource 813 is the resource with which the terminal device 1 received the SCI format 1-A of the other terminal device 1 on sub-channel #2 in slot #4 within the sensing window. The other terminal device 1 that transmitted the SCI format 1-A in resource 811 and the other terminal device 1 that transmitted the SCI format 1-A in resource 813 are different terminal devices. The terminal device 1 may convert the SCI format 1-A received in the resource 813 into the SCI format 1-B. The location of the reserved resource of the other terminal device 1 may be determined. Resource 814 is the reserved resource of the other terminal device 1 indicated by the SCI format 1-A received in resource 813. is a reserved resource of another terminal device 1 present in sub-channel #2 of Slot #11. The device 1 receives the RSRP measurement value of SCI format 1-A from the other terminal device 1 via resource 813. If it is determined that the RSRP is equal to or less than the RSRP threshold, the candidate resource 806 is not excluded from the set SA even if the reserved resource 814 of the other terminal device 1 overlaps with the candidate resource 806. The sixth step is to receive the SCI format 1-A of the other terminal device 1 in the sensing window. This is a step for deciding whether to exclude a candidate resource from the set SA based on

[0278] In the seventh step of the resource selection procedure, the terminal device 1 selects the candidate resources remaining in the set SA. If the number of candidate resources remaining in the set SA is less than X·M_total, the RSRP threshold is increased by 3 dB, and resource selection is restarted from the fourth step of the resource selection procedure. If the number of candidate resources remaining in the set SA is equal to or greater than X·M_total, the physical layer of the terminal device 1 may notify the upper layer of the terminal device 1 of the set SA. In other words, the seventh step of the resource selection procedure is to decide whether to restart resource selection. The set SA may also be referred to as a set of candidate resources.

[0279] When the terminal device 1 redoes the resource selection, the RSRP threshold for excluding candidate resources in the sixth step may be increased by 3 dB. For example, the terminal device 1 may increase the RSRP threshold by 3 dB so that the number of candidate resources to be excluded in the second sixth step is smaller than that of the first sixth step. The number of candidate resources eliminated in the second step is less than the number of candidate resources eliminated in the first step. From the first resource selection, the number of candidate resources remaining in the set SA can be increased. For example, in FIG. 8, if the number of candidate resources remaining in the set SA as a result of the first resource selection is smaller than a predetermined number, the terminal device 1 amplifies the RSRP threshold by 3 dB and redoes the resource selection from the fourth step. In FIG. 8, since the RSRP measurement value of SCI format 1-A of the other terminal device 1 received in resource 811 exceeds the RSRP threshold in the sixth step of the first round, In the sixth step for the second time, when the RSRP measurement value of SCI format 1-A received in resource 811 does not exceed the RSRP threshold, the terminal device 1 does not exclude the candidate resource 805 that overlaps with the reserved resource 812 of the other terminal device 1 from the set SA. In other words, the terminal device 1 increases the RSRP threshold and redoes the resource selection, thereby reducing the candidate resource 805 that remains in the set SA. You can increase the source.

[0280] The upper layer of the terminal device 1 receives the PSCCH / PSSCH from the set SA notified from the physical layer of the terminal device 1. The upper layer of the terminal device 1 may select (determine) resources for transmission and notify the physical layer of the terminal device 1. The upper layer of the terminal device 1 may generate an SL grant to indicate the selected resources and pass the generated SL grant to the physical layer of the terminal device 1. The physical layer of the terminal device 1 may determine resources for PSCCH / PSSCH transmission (i.e., resources selected by the upper layer of the terminal device 1) based on the SL grant. The terminal device 1 transmits the PSCCH / PSSCH using the resources selected (determined) by the higher layer. Among the resources selected (determined) by a higher layer for a certain resource selection procedure, PSCCH / PSSCH transmission in the first resource may be referred to as initial transmission. PSCCH / PSSCH transmission in resources other than the first resource may not be referred to as initial transmission. In other words, among the resources selected (determined) by a higher layer for a certain resource selection procedure, resources other than the first resource may be referred to as reserved resources (reserved resources of the terminal device 1 itself). After the terminal device 1 autonomously selects resources for PSCCH / PSSCH transmission (mode 2), The first PSCCH / PSSCH transmission in the candidate resource may be set as the initial transmission. The terminal device 1 may set the reserved resource of the terminal device 1 after the resource reservation period following the initial transmission. In the present invention, the initial transmission is the first transmission using the determined resource. The initial transmission may be referred to as the first SL transmission.

[0281] The terminal device 1 may perform MCSt (Multi-Consecutive Slot Transmission) in consecutive slots including sidelink transmission. MCSt is referred to as transmission in multiple consecutive slots. MCSt may be referred to as multiple consecutive slot transmission.

[0282] The transport blocks transmitted in each slot of the MCSt may be different transport blocks. Also, the transport blocks transmitted in each slot of the MCSt may include the same transport block. An MCSt including only the same transport block may be referred to as an MCSt of a single TB (Transport Block). An MCSt of a single TB may be referred to as an MCSt of a single transport block. An MCSt of a single TB may be referred to as multiple consecutive slots of a single transport block. The terminal device 1 performs sidelink resource allocation to determine the resources of the MCSt of a single transport block. In the case of sidelink resource allocation mode 2 for a single transport MCSt, the candidate resources may be multiple consecutive slots. MCSts for different transport blocks may be referred to as MCSts for Multiple TBs (Transport Blocks). The terminal device 1 may perform a resource selection procedure for each transport block to be transmitted in MCSt. The physical layer of the terminal device 1 may determine a set of candidate resources SA for each resource selection procedure. The MAC layer of the terminal device 1 receives the transport resources from the physical layer to determine the resources for MCSt. Alternatively, resources may be selected from the set of candidate resources SA notified for each transport block so that they are consecutive in the slot. MCSt may also be referred to as a sidelink transmission burst. For example, when performing MCSt for Multiple TBs, the terminal device 1 performs a first resource selection procedure to determine resources to be used for transmitting a first transport block, and the terminal device 1 determines a first set of candidate resources SA. The terminal device 1 performs a second resource selection procedure to determine resources to be used for transmitting a second transport block, and the terminal device 1 determines a second set of candidate resources SA. The terminal device 1 selects resources for performing MCSt from the determined first and second set of candidate resources SA. Alternatively, when performing MCSt, the terminal device 1 performs a first resource selection procedure to determine resources to be used for transmitting a first transport block, and determines a first set of candidate resources. The terminal device 1 determines resources for performing MCSt from the determined first set of candidate resources.

[0283] If interlacing is configured in the sidelink BWP, the sidelink resource allocation The number of RB sets to be used for one candidate resource, L_RBset, may be included in the parameters provided from the higher layer to the physical layer for performing mode 2. Alternatively, the upper layer may be a MAC layer. Alternatively, the upper layer may be an RRC layer. If the physical layer of the terminal device 1 is provided with an L_RBset, uses the number of RB sets indicated by L_RBset in the first step of the resource selection procedure. The number of subchannels L_subCH provided from the higher layer to the physical layer may be the number of subchannels used in one RB set. In the first step of the selection procedure, one candidate resource may be defined as consecutive subchannels in each RB set, the number of which is equal to L_subCHs, in consecutive RB sets, the number of which is equal to L_RBsets, in a certain slot. Also, one candidate resource may be defined by a slot index, a starting index of an RB set, and a starting index of a subchannel. For example, if the physical layer of the terminal device 1 is provided with L_RB set=2 and L_subCH=2 from the upper layer, the terminal device 1 defines one candidate resource as a subchannel index #0 and a subchannel index #1 in RB set #0. In RB set #1, the subchannel has subchannel index #0 and subchannel index #1. It may be a resource with channel index #1.

[0284] The number of consecutive slots Nslot,MCSt may be included in the parameters provided from the upper layer to the physical layer. The upper layer may be a layer higher than the physical layer of the terminal device 1. The upper layer may also be the MAC layer. The upper layer may also be the RRC layer. When the physical layer of the terminal device 1 is provided with Nslot,MCSt, the physical layer of the terminal device 1 may define the time domain of one candidate resource as a resource having as many consecutive slots as Nslot,MCSt in the first step of the resource selection procedure. When Nslot,MCSt is provided, one candidate resource may be referred to as a multi-slot candidate resource. The index of the time domain of one multi-slot candidate resource may be indicated by the index of the first slot of the multi-slot candidate resource. The frequency resources of the multi-slot candidate resource may all be the same for each slot. The frequency resources of the multi-slot candidate resource may also be different for each slot. For example, when contiguous RBs are configured in the resource pool, the physical layer of the terminal device 1 may define a time domain of one candidate resource as a resource having as many consecutive slots as Nslot,MCSt from the upper layer. If Nslot,MCSt=2 and L_subCH=2 are provided, one multi-slot candidate resource is used. In slot #1, subchannel index #1 and subchannel index #2 The terminal device 1 may have a resource having subchannel index #1 and subchannel index #2 in the resource pool. When this is set, if the physical layer of the terminal device 1 is provided with Nslot,MCSt=2, L_RB set=2, and L_subCH=2 from the upper layer, one multi-candidate resource is a subchannel index #1 and a subchannel index #2 in each RB set of RB set #0 and RB set #1 in slot #1. and may be a resource having subchannel index #1 and subchannel index #2 in each of RB sets RB set #0 and RB set #1 in slot #2.

[0285] A resource pool may include one or more RB sets in the frequency domain. A channel may be a carrier or a part of a carrier consisting of a set of contiguous resource blocks where channel access is performed in the shared spectrum. In other words, a channel may be a unit where sensing is performed. Sensing may be performed using a Type 1 channel access procedure. Alternatively, sensing may be performed using a Type 2 channel access procedure. Alternatively, sensing may be performed using a Type 2A channel access procedure. Alternatively, sensing may be performed using a Type 2B channel access procedure. Alternatively, sensing may be performed using a Type 2C channel access procedure. A channel may be referred to as an RB set. An RB set may be configured in a sidelink BWP. An RB set is a set of RBs that are allocated to the start of an RB set. The terminal device 1 may perform sensing for each RB set. When the terminal device 1 performs sidelink transmission simultaneously on multiple channels, the terminal device 1 may perform multi-channel access. Multi-channel access may be a method of sensing multiple channels used for sidelink transmission. The RB set may be referred to as a sub-band. Type 2A channel access procedure is also referred to as Type 2A LBT. The Type 2B channel access procedure may be referred to as Type 2B LBT. The Type 2C channel access procedure may be referred to as Type 2C LBT. A channel may be a unit of 20 MHz in the frequency domain, including an RB set and a guard band.

[0286] Terminal device 1 is scheduled to transmit on a set of channels C, Drink transmission now starts simultaneously on all channels in channel set C If scheduled, the terminal device 1 may access multiple channels on which sidelink transmissions are performed according to a multi-channel access procedure for sidelink transmissions. The terminal device 1 may also access multiple channels on which sidelink transmissions are performed according to a multi-channel access procedure for sidelink transmissions according to a set of channels C. The sidelink transmission is intended to be performed on all channels in the set C of channels. If the terminal device 1 is configured to simultaneously start transmission on multiple channels, the terminal device 1 may access multiple channels on which sidelink transmission is performed according to a multi-channel access procedure for sidelink transmission. If the terminal device 1 intends to perform a sidelink transmission on the selected resources and the sidelink transmission starts simultaneously on all channels in the set C of channels, then the terminal device 1: A sidelink access control system may access multiple channels over which sidelink transmissions are to be carried out according to a multi-channel access procedure for sidelink transmissions, where the set of channels C is one or It may be a set containing multiple channels.

[0287] The multi-channel access procedure for sidelink transmission applies to PSCCH / PSSCH transmission. The multi-channel access procedure for sidelink transmissions is applicable to S-SSB transmissions. The multi-channel access procedure for sidelink transmissions may be used for PSFCH transmissions. may be applied to.

[0288] The terminal device 1 intends to perform sidelink transmission on a set C of channels, accessing the first channel using a Type 1 channel access procedure when a Type 1 channel access procedure is used for sidelink transmissions on the set C of channels; Type 2A channel access procedure is performed on the second channel immediately before transmission on the first channel. Alternatively, the terminal device 1 may transmit using a side link in a set C of channels. The channel frequencies of channel set C are defined when the Type 1 channel access procedure is used for sidelink transmissions on channel set C. A subset of the set of channel frequencies defined in the IEEE 802.11 standard, where a first channel is accessed using a Type 1 channel access procedure and a second channel is accessed immediately before transmission on the first channel. A transmission may be made on a channel using the Type 2A channel access procedure. A first channel is a channel in a set of channels C. A first channel is a channel The second channel is any channel included in set C of channels other than the first channel, and may be randomly selected from set C of channels. For example, the terminal device 1 may apply a multi-channel access procedure to perform sidelink transmissions that start simultaneously in RB set #0, RB set #1, and RB set #2 in slot #1. The terminal device 1 may randomly select a first channel from RB set #0, RB set #1, and RB set #2. The terminal device 1 may select RB set #1 as the first channel. RB set #0 and RB set #2 may be defined as the second channel. The terminal device 1 may perform Type 1 channel access procedure in RB set #1. If Type 1 channel access in RB set #1 is successful, the terminal device 1 may perform transmission using Type 2A channel access procedure in the second channel immediately before transmission in the first channel. In other words, the terminal device 1 may perform transmission using Type 2A channel access procedure in RB set #0 and RB set #2. If the terminal device 1 does not meet the conditions for performing Type 2A channel access procedure in the second channel, the terminal device 1 selects one of channel set C. A Type 1 channel access procedure may be performed on each channel.

[0289] When the terminal device 1 performs sidelink transmission using the Type 2A channel access procedure on a certain channel, the terminal device 1 must maintain a sensing interval of at least 25 μs. If the channel is idle, the terminal device 1 may perform sidelink transmission on the channel immediately after sensing. The sensing interval may consist of a first period and one sensing slot immediately following the first period. The first period may have a duration of 16 μs. The terminal device 1 may include one sensing slot at the beginning of the 25 μs sensing interval. One sensing slot may have a duration of 9 μs. If the sensing slot is idle, the channel may be considered to be idle. For example, the terminal device 1 may define a sensing slot immediately following the first period as the first sensing slot. The terminal device 1 may define a sensing slot included at the start of the first period as the second sensing slot. If the terminal device 1 is idle in both the first sensing slot and the second sensing slot, it may determine that the channel is idle and transmit. In other words, the Type 2A channel access procedure senses the channel for at least 25 μs, and transmits if the channel is idle. The Type 2A channel access procedure used for sidelink transmission is called Type 2A SL channel access procedure. The Type 2A channel access procedure may be referred to as Type 2A LBT.

[0290] The terminal device 1 may set the duration of the signal of the first OFDM symbol of the PSCCH / PSSCH transmission to be longer by the duration of the CPE (Cyclic Prefix Extension). The start time of the first OFDM symbol in the source is set to be earlier by the CPE duration. The duration of the CPE (Cyclic Prefix Extension) is the length of the CP extension (Cyclic Prefix Extension) of the first symbol in the resource used for PSCCH / PSSCH transmission. Applying the duration of the CPE to PSCCH / PSSCH transmission may mean that the PSCCH / PSSCH transmission starts the duration of the CPE before the start of the resource used for PSCCH / PSSCH transmission. Not applying the duration of the CPE to PSCCH / PSSCH transmission may mean that the PSCCH / PSSCH transmission starts from the start (beginning) of the resource used for PSCCH / PSSCH transmission (first symbol of the resource). The physical layer of the terminal device 1 may start PSCCH / PSSCH transmission. The length of the first OFDM symbol of the PSCCH / PSSCH transmission resource notified from the higher layer may be set to be longer by the duration of the CPE. After channel sensing is completed, the signal of the first OFDM symbol of PSCCH / PSSCH transmission is The PSCCH / PSSCH transmission can be performed by setting the period longer by the duration of the CPE. The unlicensed spectrum may also be referred to as a shared spectrum.

[0291] The duration of the CPE may be the first period minus the second period. The duration may vary depending on the subcarrier spacing. The first duration may be the duration of an OFDM symbol. For a subcarrier spacing of 15 kHz, the first duration may be 0 OFDM symbols. or the period of one OFDM symbol. If the subcarrier spacing is 30 kHz, the first period The first period may be 0, 1, or 2 OFDM symbols in duration. If the subcarrier spacing is 60 kHz, the first period may be 0, 1, or 2 OFDM symbols in duration. The first period may be one or two OFDM symbols long with a subcarrier spacing of 15 kHz. For a duration of one OFDM symbol, the second period can be 16 μs, or 25 μs, or 34 μs, or The first period may be 43 μs, 52 μs, or 61 μs. If the subcarrier spacing is 30 kHz and the first period is the duration of one OFDM symbol, the second period may be 16 μs or 25 μs. If the subcarrier spacing is 30 kHz and the first period is the duration of two OFDM symbols, the second period may be 16 μs or 25 μs. In this case, the second period is 16 μs, or 25 μs, or 34 μs, or 43 μs, or 52 μs, or If the subcarrier spacing is 60 kHz and the first period is the duration of one OFDM symbol, the second period may be 16 μs. If the subcarrier spacing is 60 kHz and the first period is the duration of two OFDM symbols, the second period may be either 16 μs or 25 μs. If the first period is the duration of 0 OFDM symbols, the CPE duration is 0 μs. In other words, CPE is not applied. For example, if the subcarrier spacing is 15 kHz and the first period is 0 Hz, then the OFDM system For the first period, the index #0 may be given. The first period is 1 OFDM symbol, the second The combination of a first period of 1 OFDM symbol and a second period of 16 μs may be given index #1. The combination of a first period of 1 OFDM symbol and a second period of 25 μs may be given index #2. The combination of a first period of 1 OFDM symbol and a second period of 34 μs may be given index #3. The combination of a first period of 1 OFDM symbol and a second period of 43 μs may be given index #4. The combination of a first period of 1 OFDM symbol and a second period of 52 μs may be given index #5. The combination of 61 μs may be given index #6. The starting position of the CPE defined within the OFDM symbol may be referred to as the CPE starting position. may be a position where the CPE can start transmitting the applied PSCCH / PSSCH. The duration of the CPE may be referred to as the CPE starting position.

[0292] FIG. 9 shows an example of a CPE starting position of the terminal device 1 according to one aspect of this embodiment. 9 is a diagram. The terminal device 1 may include any of the terminal devices 1A to 1D in FIG. 1. FIG. 9 shows the CPE starting position within one OFDM symbol when the subcarrier spacing is 15 kHz. The one OFDM symbol in FIG. 9 may be the OFDM symbol immediately before the first OFDM symbol of the PSCCH / PSSCH transmission. S908 may be the start position of the OFDM symbol. S901 may be a CPE starting position 16 μs after S908. That is, it may be a CPE starting position where the first period is 1 OFDM symbol and the second period is 16 μs. S901 may be a CPE starting position corresponding to index #1 of the combination of the first period and the second period. S902 may be a CPE starting position 25 μs after S908. That is, it may be a CPE starting position where the first period is 1 OFDM symbol and the second period is 25 μs. S902 may be a CPE starting position corresponding to index #2 of the combination of the first period and the second period. S903 is , the CPE starting position may be 34 μs after S908. That is, the first period S903 may be a CPE starting position corresponding to a combination index #3 of the first period and the second period. S904 is a CPE starting position 43 μs after S908. That is, the first period may be a CPE starting position corresponding to 1 OFDM symbol, and the second period may be a CPE starting position corresponding to 43 μs. S905 may be a CPE starting position corresponding to index #4. S905 may be a CPE starting position 52 μs after S908. In other words, the first period may be a CPE starting position corresponding to 1 OFDM symbol and the second period may be a CPE starting position corresponding to 52 μs. S906 may be a CPE starting position corresponding to combination index #5 of the first period and the second period. S906 may be a CPE starting position 61 μs after S908. In other words, the first period may be a CPE starting position corresponding to 1 OFDM symbol and the second period may be a CPE starting position corresponding to 61 μs. S906 is a CPE starting position corresponding to the combination index #5 of the first period and the second period. S907 may be the CPE starting position corresponding to box #6. S907 may be the starting position of the first OFDM symbol of PSCCH / PSSCH transmission. In other words, when CPE is not applied, S907 may be a CPE starting position corresponding to 0 OFDM symbols in the first period. S907 may be a CPE starting position corresponding to index #0 of the combination of the first period and the second period.

[0293] The terminal device 1 determines the slot and RB set(s) for the first PSCCH / PSSCH transmission to start COT. If the terminal device 1 does not detect reserved resources of other terminal devices 1 and its own reserved resources do not exist, the terminal device 1 may randomly determine a CPE starting position from a set of CPE starting positions corresponding to the priority of PSCCH / PSSCH transmission. The set of CPE starting positions may be a set of one or more CPE starting positions set for each priority of PSCCH / PSSCH transmission. The set of CPE starting positions may also be referred to as a set of values. The priority of PSCCH / PSSCH transmission may also be referred to as L1 priority. The terminal device 1 determines the slot and RB set(s) for the first PSCCH / PSSCH transmission to start COT from other CPEs. When the terminal device 1 detects a reserved resource, the terminal device 1 may select a default CPE starting position and apply it to the PSCCH / PSSCH transmission. When the terminal device 1 performs the first PSCCH / PSSCH transmission that starts COT on its own reserved resource, the terminal device 1 may select a default CPE starting position and apply it to the PSCCH / PSSCH transmission. The default CPE starting position may be configured in a higher layer. A set of one or more CPE starting positions associated with the L1 priority may be configured in a higher layer. The terminal device 1 may start transmitting the first OFDM symbol of the PSCCH / PSSCH transmission from the determined CPE starting position. The default CPE starting position is a CPE starting position common to the L1 priority. An index associated with a default CPE starting position may be referred to as a default index. A set of CPE starting positions may be referred to as multiple CPE starting positions.

[0294] When the terminal device 1 performs sidelink resource allocation mode 2 and transmits using resources determined by the terminal device 1 itself, the terminal device 1 does not detect reserved resources of other terminal devices 1 in the slot and RB set(s) for the first PSCCH / PSSCH transmission that starts COT, and If there are no reserved resources for the terminal device 1, the terminal device 1 sets the priority of the PSCCH / PSSCH transmission. The terminal device 1 may determine the CPE starting position randomly from the set of corresponding CPE starting positions. When the terminal device 1 performs sidelink resource allocation mode 2 and transmits on the resources determined by the terminal device 1 itself, the terminal device 1 determines the initial CPE starting position for starting COT. When the terminal device 1 detects reserved resources of other terminal devices 1 in the slots and RB set(s) for PSCCH / PSSCH transmission, the terminal device 1 may select a default CPE starting position and apply it to PSCCH / PSSCH transmission. When the terminal device 1 performs sidelink resource allocation mode 2 and transmits on resources determined by the terminal device 1 itself, when the terminal device 1 performs the first PSCCH / PSSCH transmission to start COT on its own reserved resources, the terminal device 1 may select a default CPE starting position. A starting position may be selected and applied to the PSCCH / PSSCH transmission.

[0295] When multiple CPE starting positions are not configured by a higher layer, the terminal device 1 may apply a default CPE starting position to the first PSCCH / PSSCH transmission within the COT. When multiple CPE starting positions are configured by a higher layer, the terminal device 1 does not detect reserved resources of other terminal devices 1 in the slot and RB set(s) for PSCCH / PSSCH transmission, and if its own reserved resources do not exist, the terminal device 1 may randomly determine a CPE starting position from a set of CPE starting positions corresponding to the priority of PSCCH / PSSCH transmission. The set of CPE starting positions may be a set of one or more CPE starting positions configured for each priority of PSCCH / PSSCH transmission. The set of CPE starting positions may be referred to as a set of values. The priority of PSCCH / PSSCH transmission may be referred to as L1 priority. When the terminal device 1 detects the reserved resources of other terminal devices 1 in the slot and RB set(s) for the first PSCCH / PSSCH transmission in the COT, the terminal device 1 selects the default CPE starting position. When the terminal device 1 performs the first PSCCH / PSSCH transmission in its own reserved resource within the COT, the terminal device 1 selects the default CPE starting position. The default CPE starting position may be selected and applied to PSCCH / PSSCH transmission. A set of one or more CPE starting positions associated with an L1 priority may be configured by a higher layer. A set of one or more CPE starting positions associated with an L1 priority may be referred to as multiple CPE starting positions. The device 1 may start transmitting the first OFDM symbol of the PSCCH / PSSCH transmission from the determined CPE starting position. The default CPE starting position is common to the L1 priority. It may be the CPE starting position of the default CPE starting position. The assigned index may be referred to as a default index.

[0296] The terminal device 1 transmits PSCCH / PSSCH using the resource in which the reserved resource of the other terminal device 1 is detected. In this case, in the sixth step of the resource selection procedure of the sidelink resource allocation mode 2 of the terminal device 1, PSCCH / PSSCH transmission is performed using resources that overlap with reserved resources of other terminal devices 1 but are not excluded from the set SA because the RSRP threshold is not exceeded. That's fine.

[0297] A set of CPE starting positions corresponding to the priority of PSCCH / PSSCH transmission may be configured in a resource pool. A default CPE starting position may be configured in a resource pool. A set of CPE starting positions corresponding to the priority of PSCCH / PSSCH transmission may be referred to as multiple CPE starting positions. Default CPE starting position may be referred to as default CPE starting positions. Multiple CPE starting positions applied to PSCCH / PSSCH transmission for initiating COT may be configured in sl-CPE-StartingPositionsPSCCH-PSSCH-InitiateCOT-List. PSCCH / PSSCH transmission for initiating COT The default CPE starting position applied to PSCCH / PSSCH transmission within the COT may be configured in sl-CPE-StartingPositionsPSCCH-PSSCH-InitiateCOT-Default. Multiple CPE starting positions applied to PSCCH / PSSCH transmission within the COT may be configured in sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-List. The default CPE starting position applied to PSCCH / PSSCH transmission within the COT may be configured in sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-Default. The sl-CPE-StartingPositionsPSCCH-PSSCH-InitiateCOT-List may be configured in a resource pool. The sl-CPE-StartingPositionsPSCCH-PSSCH-InitiateCOT-List indicates a set of selected indexes corresponding to multiple candidate CPE starting positions used for PSCCH / PSSCH transmission when the terminal device 1 starts COT, and may be associated with each L1 priority of PSSCH. The sl-CPE-StartingPositionsPSCCH-PSSCH-InitiateCOT-Default indicates a set of selected indexes corresponding to multiple candidate CPE starting positions used for PSCCH / PSSCH transmission when the terminal device 1 starts COT, and may be associated with each L1 priority of PSSCH. The sl-CPE-StartingPositionsPSCCH-PSSCH-InitiateCOT-Default is the default CPE station used for PSCCH / PSSCH transmission when the terminal device 1 starts COT. The sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-List may indicate the CPE starting position index of the starting position. The sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-List may be configured in the resource pool. The sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-List is associated with each L1 priority of the PSSCH. The sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-Default may indicate a set of one or more selected indices corresponding to one or more candidate CPE starting positions to be used for PSCCH / PSSCH transmission within the selected COT. The sl-CPE-StartingPositionsPSCCH-PSSCH-WithinCOT-Default may indicate the CPE starting position index of the default CPE starting position used for PSCCH / PSSCH transmission within the COT of the terminal device 1.

[0298] The terminal device 1 may perform Inter-UE Coordination (IUC). The terminal device 1 may perform Inter-UE coordination (IUC) in sidelink resource allocation mode 2. Interconnection Coordination (IUC) may be a method in which a terminal device 1 sends information about resources to another terminal device 1, and the other terminal device 1 uses the information for resource selection. IUC may support scheme 1 and scheme 2. In IUC scheme 1, the IUC information transmitted from the terminal device 1 to the other terminal device 1 may be information indicating a preferred resource for the other terminal device 1. In IUC scheme 1, the IUC information transmitted from the terminal device 1 to the other terminal device 1 may be information indicating a non-preferred resource for the other terminal device 1. In IUC scheme 2, the IUC information transmitted from the terminal device 1 to the other terminal device 1 may be information indicating the existence of expected / potential resource contention on the resource indicated by the SCI of the other terminal device 1. Other terminal device 1 Another terminal device 1 from which IUC information is requested by the terminal device 1 may also be referred to as a peer UE.

[0299] In IUC scheme 1, the transmission of IUC information from terminal device 1 may be triggered by the conditions of terminal device 1. In IUC scheme 1, the transmission of IUC information from terminal device 1 may be triggered by an explicit request from another terminal device 1. Terminal device 1 may determine a set of resources reserved by another terminal device 1 as non-preferred resources. Alternatively, when the terminal device 1 is a target receiver of the other terminal device 1, the terminal device 1 expects to receive a side link from the other terminal device 1 by half-duplex operation. The set of resources belonging to slots that are not preferred may be determined as non-preferred resources. The terminal device 1 uses the determined set of resources as non-preferred resources, Alternatively, the terminal device 1 may transmit information indicating a non-preferred resource to the other terminal device 1. 1 is expected to receive a side link from another terminal device 1 by half-duplex operation. The set of resources that excludes the set of resources that belong to slots that are not waiting is called the preferred resource. Alternatively, the terminal device 1 may determine the resource as the source and transmit information indicating the preferred resource to the other terminal device 1. The other terminal device 1 may receive IUC information from the terminal device 1 and perform resource (re)selection based on both the sensing result and the IUC information. In the IUC scheme 1, the terminal device 1 may receive the information and perform resource (re)selection based only on the IUC information. In the IUC scheme 1, the terminal device 1 may use MAC CE and 2nd stage SCI to transmit the IUC information. In the IUC scheme 1, the terminal device 1 may use only MAC CE to transmit the IUC information. In the case of transmission of IUC information triggered by an explicit request, the explicit request The IUC information may be sent via unicast, except by explicit request. In case of IUC information transmission triggered by the IUC information indicating the set of IUCs may be sent via unicast. In the case of transmission of IUC information triggered by an external condition, the IUC information indicating a non-preferred resource set may be transmitted by unicast, groupcast, or broadcast.

[0300] In IUC scheme 2, terminal device 1 can share resources reserved by other terminal devices 1 and other If the resource indicated by the SCI of terminal device 1 is a resource that completely or partially overlaps with the resource indicated by the SCI of terminal device 1, Alternatively, in IUC scheme 2, the terminal device 1 may determine that there is an expected / potential resource conflict within the resources indicated by the SCI of the other terminal device 1. The intended recipient of the signal is device 1, and half-duplex operation allows device 1 to side-receive the signal. The slots where no link reception is expected are the resources indicated by the SCI of other terminal equipment 1. If the SCI of the other terminal device 1 is a slot, the other terminal device 1 may determine that there is an expected / potential resource conflict within the resources indicated by the SCI of the other terminal device 1. The other terminal device 1 may determine the resources to be reselected taking into account the conflicting resources (resources for which resource conflict exists). The other terminal device 1 may exclude the conflicting resources from the resources to be reselected. In IUC scheme 2, the terminal device 1 may use the PSFCH to transmit IUC information.

[0301] IUC information may be transmitted in SCI format 2-C. SCI format 2-C may be used for decoding the PSSCH. SCI format 2-C may be used to provide IUC information. SCI format 2-C may be used to request IUC information. SCI format 2-C may be used for unicast. SCI format 2-C may include an HARQ process number field, a New data indicator field, a Redundancy version field, a Source ID field, a Destination ID field, an HARQ feedback enabled / disabled indicator field, a CSI request field, and a Providing / Requesting indicator field. If the Providing / Requesting indicator field is set to 0, SCI format 2-C may include a Resource combinations field, a first resource location field, a Resource set type field, and a Lowest subchannel indices field. If the Providing / Requesting indicator field is set to 1, SCI format 2-C may include the Priority field, Number of subchannels field, Resource reservation period field, Resource selection window location field, Resource set type field, and Padding bits field. When operating in the same resource pool, the payload size must be equal to that of SCI format 2-C with the Providing / Requesting indicator field set to 0. Until then, a 0 bit may be added to SCI format 2-C where the Providing / Requesting indicator field is set to 1.

[0302] When the procedure for determining a set of preferred or non-preferred resources is triggered, the terminal device 1 is provided with the following parameters from higher layers: The resource pool from which preferred or non-preferred resources are determined. · The resource selection window [n+T1, n+T2] in which preferred or non-preferred resources are determined. ·Resource set type (preferred resource set or non-preferred resource set). ·If the resource set type indicates a preferred resource set, the upper layer may additionally provide the following parameters: -L1 priority, prioTX - number of subchannels used for PSCCH / PSSCH transmission in one slot, L_subCH -Resource reservation period, Prsvp_TX (if present) - The number of RB sets used for PSCCH / PSSCH transmission in one slot, L_RB set If transmissionStructureForPSCCHandPSSCH is set to interlaceRB, L_RB set may be provided from a higher layer. If transmissionStructureForPSCCHandPSSCH is set to interlaceRB, L_sucCH may be the number of subchannels in each RB set. If the determination of a preferred resource or a non-preferred resource is triggered by a condition other than an explicit request from another terminal device 1, the terminal device 1 receives the above-mentioned packet from the upper layer. The above parameters may be used to determine the resource selection for IUC information. The procedure for determining the set of preferred or non-preferred resources may be referred to as a resource selection procedure for determining IUC information. may be a layer higher than the physical layer. The higher layer may be the MAC layer. The higher layer may be the RRC layer. The resource selection window [n+T1, n+T2] may be referred to as a resource selection window. The terminal device 1 selects a preferred resource within the resource selection window [n+T1, n+Ts]. L1 priority determines the priority of PSSCH transmission. If the resource set type indicates a preferred resource, the terminal device 1 determines the preferred resource. If the resource set type indicates a non-preferred resource, the terminal device 1 determines the non-preferred resource. The conditions under which the procedure for determining preferred or non-preferred resources is triggered are It may be defined in layers.

[0303] The terminal device 1 receives a Request from another terminal device 1 in the Providing / Requesting indicator field. Upon receiving SCI format 2-C indicating the IUC information, the resource selection procedure is performed to determine the IUC information. The Providing / Requesting indicator field of SCI format 2-C is set to 1. If the Providing / Requesting indicator field of SCI format 2-C is set to 0, SCI format 2-C may be used to request IUC information. The IUC information is related to the preferred resource. The IUC information may be information relating to non-preferred resources. When the Providing / Requesting indicator field of the SCI format 2-C received by the terminal device 1 from another terminal device 1 indicates 1 and the Resource set type field of the SCI format 2-C indicates 0, The terminal device 1 is instructed by another terminal device 1 to provide information about the preferred resource set. The terminal device 1 determines that the SCI format received from the other terminal device 1 is When the Providing / Requesting indicator field of SCI format 2-C indicates 1 and the Resource set type field of SCI format 2-C indicates 1, the terminal device 1 determines that it has been requested by the terminal device 1 to provide information about a non-preferred resource set. When the terminal device 1 requests IUC information from another terminal device 1, the terminal device 1 may set the Providing / Requesting indicator field of the SCI format 2-C to be transmitted to the other terminal device 1 to 1. The terminal device 1 may indicate 1 in the Providing / Requesting indicator field of SCI format 2-C and 0 in the Resource set type field to request information about preferred resources from another terminal device 1. The terminal device 1 may indicate 1 in the Providing / Requesting indicator field of SCI format 2-C and 1 in the Resource set type field to request information about non-preferred resources from another terminal device 1. If the upper layer parameter sl-DetermineResourceType is not set to ueb, the terminal device 1 may set the Providing / Requesting indicator field to 0. The number of bits in the Resource set type field when set to 1 may be 0. The sl-DetermineResourceType is the resource set type provided by the inter-UE coordination information transmission. It may also indicate how to determine the set type (preferred resource or non-preferred resource). sl-DetermineResourceType may indicate uea or ueb. uea indicates the resource type. It may also mean that the resource set type is determined by the implementation of UE-A. This may mean that the resource type is determined by UE-B's request.

[0304] The Resource selection window location field of SCI format 2-C is The start and end time positions of the resource selection window can be specified in the same way as the reference slot. The reference slot may be encoded as a DFN index and a slot index. The DFN index may be indicated in the Reference slot field as a combination of the above. The DFN index may be indicated in the upper 10 bits (10 MSBs: Most Significant Bits) of the Reference slot field. The slot index may be indicated by the remaining bits excluding the most significant 10 bits (10 MSB) of the slot field. In the Resource selection window field, the combination of the DFN index and slot index at the start and end time positions of the Resource selection window is For example, when the subcarrier spacing is 15 kHz, the number of bits in the Resource Selection Window field may be 28. Of the 28 bits, the most significant 14 bits (14 MSB) indicate the DFN index and slot index of the start time position of the Resource Selection Window. Of the 28 bits, the lowest 14 bits (14 LSB: Least Significant Bit) The DFN index and slot index of the end time position of the resource selection window are The upper 14 bits (14 MSB) of the 28 bits of the Resource selection window field may indicate the DFN index of the start time position of the Resource selection window using the upper 10 bits (10 MSB). The upper 14 bits (14 MSB) of the 28 bits of the Resource selection window field may indicate the slot index of the start time position of the Resource selection window using the lower 4 bits (4 LSB). The DFN index of the end time position of the Resource selection window may be indicated by the most significant 14 bits (14 MSB) of the 28 bits of the Resource selection window field. The DFN index of the end time position of the Resource selection window may be indicated by the most significant 10 bits (10 MSB). The DFN index of the end time position of the Resource selection window may be indicated by the most significant 14 bits (14 MSB) of the 28 bits of the Resource selection window field. The bit index may be indicated.

[0305] FIG. 10 shows IUC information in a resource pool in which a terminal device 1 according to one aspect of this embodiment is located. 10 is a diagram illustrating an example of a resource selection procedure for determining the transmission structure for PSSCH and PSSCH. In FIG. 10, transmissionStructureForPSCCHandPSSCH may be set to contiguousRB. 1. The other terminal device 1 may be any of the terminal devices 1A to 1D in FIG. 1. In FIG. 10, one horizontal square is one slot, and one vertical square is one sub-channel. Sub-channel #0 is a sub-channel in the resource pool, and has an index of 0. Slot #0 is a slot that belongs to the resource pool, and has an index of 0.

[0306] The terminal device 1 may define all candidate resources within a resource selection window as the first step of a resource selection procedure for determining IUC information. The resource selection window may be indicated by the resource selection window of SCI format 2-C. The resource selection window may be indicated from a higher layer. A candidate resource for one slot may be referred to as a candidate single-slot resource. The terminal device 1 may set consecutive subchannels equal to the number of L_subCHs in a slot within the resource selection window of the resource pool as one candidate resource. In other words, one candidate resource may be defined as consecutive resources equal to the number of L_subCHs from the index of a certain subchannel in a certain slot. L_subCH may be a value indicating the number of subchannels. L_subCH may be indicated in SCI format 2-C. L_subCH may be indicated in the Number of subchannels field of SCI format 2-C. L_subCH may be indicated from a higher layer. If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to contiguousRB, the candidate single-slot resource is R x,y may be defined as R x,y is slot t y In t, the candidate resources may be consecutive L_subCHs starting from subchannel index x. y The terminal device 1 may select, for one or more consecutive RB sets equal to the number of L_RBsets in a slot within the resource selection window of the resource pool, consecutive subchannels equal to the number of L_subCHs in each RB set as one candidate resource. That is, one candidate resource is a resource that is selected from an RB set to L_RBset in a slot. L_RBset may be defined as consecutive resources numbered as L_subCHs, starting from the index of a subchannel in each of one or more consecutive RB sets numbered as L_subCHs. L_RBset may be a value indicating the number of RB sets. L_RBset may be indicated in SCI format 2-C. L_RBset may be indicated by the Number of RB sets field in SCI format 2-C. L_RBset may be indicated by a higher layer. When the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to interlacedRB, If specified, the candidate single-slot resource is x,y,z may be defined as R x,y,z is slot t y In the case of RB set z, the number of consecutive candidate resources may be one or more consecutive RB sets starting from subchannel index x, the number of which is L_subCHs, in one or more consecutive RB sets starting from RB set z, the number of which is L_RBsets. When the upper layer parameter transmissionStructureForPSCCHandPSSCH is set to interlaceRB, the Number of RB sets field included in SCI format 2-C The number of bits is the number of RB sets in the resource pool, N RBset If the higher layer parameter transmissionStructureForPSCCHandPSSCH is not set to interlaceRB, the number of bits in the Number of RB sets field included in SCI format 2-C may be 0. The higher layer parameter transmissionStructureForPSCCHandPSSCH is set to the sidelink RB. The transmissionStructureForPSCCHandPSSCH may be set for the SL-BWP-Config. The transmissionStructureForPSCCHandPSSCH may be an RRC parameter. The transmissionStructureForPSCCHandPSSCH may be set in the SL-BWP-Config. The terminal device 1 may set the number of all candidate resources in the resource selection window as M_total. For example, in FIG. 10, the transmissionStructureForPSCCHandPSSCH may be set to contiguousRB. Resource selection window location field In SCI format 2-C, slot #8 may be indicated as the start time position and slot #11 as the end time position. Two subchannels may be indicated in the Number of subchannel field. 101 may be a resource selection window. The start time position of the resource selection window may be slot #8. The end time position of the resource selection window may be slot #10. 102 may be one candidate resource defined by sub-channel #0 and sub-channel #1 in slot #8. 103 may be one candidate resource defined by sub-channel #1 and sub-channel #2 in slot #8. 104 may be one candidate resource defined by sub-channel #0 and sub-channel #1 in slot #9. 105 may be one candidate resource defined by sub-channel #1 and sub-channel #2 in slot #9. 106 may be one candidate resource defined by sub-channel #0 and sub-channel #1 in slot #10. 107 is defined as sub-channel #1 and sub-channel #2 in slot #10. 10 may be one candidate resource defined by sub-channel #0 and sub-channel #1 in slot #11. 109 may be one candidate resource defined by sub-channel #1 and sub-channel #2 in slot #11. In FIG. 10, M_total may be 8.

[0307] The terminal device 1 may define a sensing window as the second step of the resource selection procedure for determining IUC information. The sensing window may be defined in the range from slot n-T0 to slot n-Tproc0. Slot n may be determined based on the resource selection window location field indicated in SCI format 2-C. Slot n may be determined based on the resource selection window [n+T1, n+T2] indicated by the upper layer. The start slot of the resource selection window may be defined as n+T1, where T1 is between 0 and Tproc1. The terminal device 1 may determine T1 in the range from 0 to Tproc1. Tproc1 is the number of slots and may be defined for each subcarrier spacing. For a subcarrier spacing of 15 kHz, Tproc1 may be 3 slots. For a subcarrier spacing of 30 kHz, In this case, Tproc1 may be 5 slots. In the case of a subcarrier spacing of 60 kHz, Tproc1 may be 9 slots. The terminal device 1 may use the Resource selection The slot n may be determined based on the window and the subcarrier interval. The T0 may be determined based on the resource selection window [n+T1, n+T2] indicated by the layer. may be determined based on the RRC parameter sl-SensingWindow. , may be included in the resource pool configuration information. sl-SensingWindow may be a parameter for determining the start of the sensing window. Tproc0 may be used to determine the end of the sensing window. Tproc0 is the number of slots and may be defined per subcarrier spacing of the sidelink BWP. For a subcarrier spacing of 15 kHz, Tproc0 may be 1 slot. For a subcarrier spacing of 30 kHz, Tproc0 may be 1 slot. In the case of a subcarrier spacing of 60 kHz, Tproc0 may be 2 slots. The terminal device 1 monitors slots belonging to the sidelink resource pool within the sensing window, excluding the slot in which the terminal device 1 itself has transmitted. The terminal device 1 may monitor slots within the sensing window. In other words, the second step of the resource selection procedure is a step for defining the sensing window and monitoring slots within the sensing window. For example, in FIG. 10, 110 is slot n. 111 may be a sensing window. Slot #1 is slot n-T0 Slot #4 may be the slot corresponding to slot n-Tproc0. may be.

[0308] The terminal device 1 may determine an RSRP threshold (threshold related to RSRP) as a third step of the resource selection procedure for determining IUC information. In the sixth step, the terminal device 1 determines the RSRP threshold in order to exclude candidate resources based on the RSRP threshold. The terminal device 1 uses the priority indicated in SCI format 2-C and the priority notified in SCI format 1-A of the other terminal device 1. The terminal device 1 may determine the RSRP threshold from the PSSCH transmission priority L1 priority prioRX and the RRC parameter sl-Thres-RSRP-List. The terminal device 1 may determine the RSRP threshold from the PSSCH transmission priority L1 priority prioRX notified in SCI format 1-A of the terminal device 1 and the RRC parameter sl-Thres-RSRP-List. The RSRP threshold may be determined for each other terminal device 1. The sl-Thres-RSRP-List contains 64 types of thresholds. The sl-Thres-RSRP-List may indicate a list. The sl-Thres-RSRP-List may be included in the configuration information of the resource pool. The index of the sl-Thres-RSRP-List may be determined from the priority indicated in SCI format 2-C and the priority L1 priority prioRX of the PSSCH transmission of the other terminal device 1. The index of the sl-Thres-RSRP-List may be determined from the L1 priority indicated from the higher layer and the priority L1 priority prioRX of the PSSCH transmission of the other terminal device 1. The index i of the sl-Thres-RSRP-List is expressed as i = p i + ( p j - 1) * 8. i is another terminal It may be the priority indicated in SCI format 1-A of device 1. j p may be the priority indicated in the Priority field of SCI format 2-C. j The priority may be L1 priority indicated by a higher layer. The priority is indicated in the Priority field of SCI format 2-C. The Priority field of SCI format 2-C may be represented by 3 bits. For example, When 000 is indicated in the Priority field of format 2-C, the Priority value may correspond to 1. When 001 is indicated in the Priority field of SCI format 2-C, the Priority value may correspond to 2. The priority indicated in the Priority field of SCI format 2-C may be the NR PC5 Priority level. The NR PC5 Priority level may have the same format and meaning as the LTE PC5 Prose Per-Packet Priority (PPPP) Priority value. The PPPP value may reflect the LTE PC5 latency requirement and Packet Delay Budget (PDB). A lower PDB may be mapped to a higher PPPP value. NR PC5 Priority level may be associated with the PDB and the PQI. That is, the third step of the resource selection procedure is to determine the RSRP threshold.

[0309] As a fourth step of the resource selection procedure for determining IUC information, the terminal device 1 may set all candidate resources in the candidate resource set SA. In step S1, the terminal device 1 may initialize the set SA to include all the candidate resources determined in step S1. That is, the fourth step of the resource selection procedure is: This is a step for setting all the candidate resources determined in the first step in set SA, which is a collection of candidate resources. In Fig. 10, set SA may include 102. Set SA may include 103. Set SA may include 104. Set SA may include 105. Set SA may include 106. Set SA may include 107. Set SA may include 108. Set SA may include 109.

[0310] As a fifth step of the resource selection procedure for determining IUC information, the terminal device 1 transmits within the sensing window, and assumes that it has received SCI format 1-A in a slot that it is not monitoring within the sensing window. It then selects slots on all periods of the RRC parameter sl-ResourceReservePeriodList from the slot where it is assumed that SCI format 1-A has been received. Candidate resources belonging to the resource pool may be excluded from the set SA. The sl-ResourceReservePeriodList indicates a set of periods of reserved resources valid in the resource pool, and up to 16 values ​​may be set for each resource pool. The sl-ResourceReservePeriodList may be included in the configuration information of the resource pool. The terminal device 1 performs the second step of the resource selection procedure. In the slots in the sensing window defined in step t', the terminal device 1 is not monitoring. m Assume that SCI format 1-A is received in slot t'. m Set candidate resources belonging to the slot of the period indicated by Resource reservation period from SA The resource reservation period may be excluded. The resource reservation period may be indicated by the upper layer parameter sl-ResourceReservationPeriodList. The resource reservation period may be indicated by the Resource Reservation Period field in SCI format 2-C. That is, the first Step 5 is a step for excluding candidate resources from set SA in consideration of slots not being monitored within the sensing window. For example, in FIG. 10, slot 112 may be a slot that terminal device 1 is not monitoring. Assuming that terminal device 1 receives SCI format 1-A in slot 112, terminal device 1 excludes candidate resources belonging to slots on all periods in sl-ResourceReservePeriodList from slot 112 from set SA. 112 may be slot #2. In FIG. 10, sl-ResourceReservePeriodList indicates 7 period slots (one period is 7 slots). Slot #9 is a slot 7 period slots from slot 112 (a slot 7 slots after one period). Terminal device 1 excludes candidate resources belonging to slot #9 from set SA. Terminal device 1 excludes candidate resources belonging to slot #9 from set SA. Terminal device 1 excludes candidate resources 104 and 105 from set SA.

[0311] In step 5a) after the fifth step of the resource selection procedure for determining IUC information, if the number of candidate resources remaining in the set SA is smaller than X·M_total, the terminal device 1 may set all the candidate resources determined in the first step to the set SA. X is the number of candidate resources remaining in the set SA. This shows the ratio of candidate resources to the total number of candidate resources M_total determined in step X may be set by the RRC parameter sl-TxPercentateList. sl-TxPercentateList may be included in the configuration information of the resource pool. If the number of candidate resources remaining in the set SA is equal to or greater than X·M_total, the terminal device 1 maintains the candidate resources of the set SA. If the number of candidate resources remaining in the set SA is smaller than X·M_total, the set SA may be initialized with all candidate resources as in the fourth step.

[0312] As a sixth step of the resource selection procedure for determining IUC information, the terminal device 1 may exclude candidate resources from the set SA based on the SCI format 1-A of the other terminal device 1 received in the sensing window. The terminal device 1 may determine the location of the reserved resources of the other terminal device 1 based on the resource reservation period field, the time domain resource allocation field, and the frequency domain resource allocation field of the SCI format 1-A of the other terminal device 1 received in the sensing window. The terminal device 1 may determine the location of the reserved resources of the other terminal device 1 based on the resource reservation period field (if any) and the priority field of the SCI format 1-A of the other terminal device 1 received, respectively. rsvpRX and prio Rx If the RSRP measurement value of the SCI format 1-A of the other terminal device 1 is higher than the set RSRP threshold and the reserved resource of the other terminal device 1 partially or completely overlaps with the candidate resource, the candidate resource may be excluded from the set SA. For example, in FIG. 10, resource 113 is a resource used by the terminal device 111 on sub-channel #2 in slot #3 within the sensing window of the terminal device 111. Resource 114 is a resource from which terminal device 1 has received SCI format 1-A from other terminal device 1. Terminal device 1 may determine the location of the reserved resource of other terminal device 1 from SCI format 1-A received in resource 113. Resource 114 is a reserved resource of other terminal device 1 that exists in sub-channel #2 of Slot #11. When terminal device 1 determines that the RSRP measurement value of SCI format 1-A of other terminal device 1 received in resource 113 is higher than the set RSRP threshold, it excludes candidate resource 109 that overlaps with reserved resource 114 of other terminal device 1 from set SA. Resource 115 is a resource from which terminal device 1 has received SCI format 1-A of other terminal device 1 on sub-channel #2 in slot #1 within the sensing window. The other terminal device 1 that transmitted SCI format 1-A in resource 113 and the other terminal device 1 that transmitted SCI format 1-A in resource 115 may be different terminal devices. The terminal device 1 may determine the location of the reserved resource of the other terminal device 1 from the SCI format 1-A received in resource 115. Resource 116 is the reserved resource of the other terminal device 1 indicated by the SCI format 1-A received in resource 115. Resource 116 exists in sub-channel #2 of Slot #8. The candidate resource 103 is a reserved resource of the other terminal device 1. When the terminal device 1 determines that the RSRP measurement value of the SCI format 1-A of the other terminal device 1 received at the resource 115 is equal to or less than the set RSRP threshold, the terminal device 1 does not exclude the candidate resource 103 from the set SA even if the candidate resource 103 overlaps with the reserved resource 116 of the other terminal device 1.

[0313] The terminal device 1, as step 6a) of the resource selection procedure for determining IUC information, Position 1 is the destination of the transport block for which the preferred resource set is determined. If the UE is the first UE and the higher layer parameter sl-Condition1-A-2 is not set to Disabled, The terminal device 1 receives the transport block by half-duplex operation. The terminal device 1 may exclude candidate resources belonging to slots in which the terminal device 1 does not expect to receive from other terminal devices 1. The terminal device 1 may perform step 6a to determine the preferred resource set. sl-Condition 1-A-2 indicates that the terminal device 1 disables the condition for excluding resources from the preferred resource set in slots in which the terminal device 1 does not expect to receive from other terminal devices 1 by half-duplex operation. sl-Condition 1-A-2 specifies that when UE-A is the target receiver of UE-B, UE-A is expected to perform SL reception from UE-B in half-duplex operation. Disables the use of conditions that exclude resources from the preferred resource set in slots that do not For example, in FIG. 10, when the upper layer parameter sl-Condition1-A-2 of the terminal device 1 is not set to Disabled and another terminal device 1 transmits a transport block to the terminal device 1 using the preferred resource provided by the terminal device 1, when the terminal device 1 performs its own transmission in slot #10, the terminal device 1 may exclude candidate resources belonging to slot #10 from the set SA. The terminal device 1 may exclude candidate resources 106 belonging to slot #10 and 1 07 may be excluded from set SA.

[0314] In the seventh step of the resource selection procedure for determining IUC information, if the number of candidate resources remaining in the set SA is smaller than X·M_total, the terminal device 1 increases the RSRP threshold by 3 dB and starts resource selection again from the fourth step of the resource selection procedure for determining IUC information. If the number of candidate resources remaining in the set SA is equal to or greater than X·M_total, the physical layer of the terminal device 1 may notify the upper layer of the set SA. That is, in the seventh step of the resource selection procedure, This step is a step for deciding whether to redo the resource selection. The set SA may be referred to as a set of candidate resources.

[0315] When redoing resource selection, the terminal device 1 may increase the RSRP threshold for excluding candidate resources in the sixth step by 3 dB. For example, the terminal device 1 may increase the RSRP threshold by 3 dB so that the number of candidate resources to be excluded in the second sixth step is smaller than that in the first sixth step. The number of candidate resources eliminated in the second round of resource selection is less than the number of candidate resources eliminated in the first round. As a result of the first resource selection, the number of candidate resources remaining in the set SA can be increased. For example, in FIG. 10, the terminal device 1 increases the number of candidate resources remaining in the set SA as a result of the first resource selection. If the number of sources is less than the predetermined number, the RSRP threshold is increased by 3 dB, and resource selection is redone from step 4. In FIG. 10, in step 6 for the first time, the terminal device 1 receives the RSRP measurement value of SCI format 1-A of the other terminal device 1 on resource 113, and therefore, Therefore, the terminal device 1 excluded candidate resources 109 that overlap with reserved resources 114 of other terminal devices 1 from the set SA. When the RSRP measurement value of SCI format 1-A received at resource 113 does not exceed the RSRP threshold in the sixth step for the second time, the terminal device 1 does not exclude candidate resources 109 that overlap with reserved resources 114 of other terminal devices 1 from the set SA. In other words, the terminal device 1 increases the RSRP threshold and redoes resource selection, thereby eliminating candidate resources 109 that remain in the set SA. You can increase your supplementary resources.

[0316] The terminal device 1 receives / transmits the preferred resource set and the non-preferred resource set. The sl-InterUE-CoordinationScheme1 that enables Terminal device 1 does not have its own sensing results and receives a preferred resource set from another terminal device 1. If so, the terminal device 1 provides a preferred resource set according to the amount of selected frequency resources and the remaining PDB of sidelink data available in the logical channel to other terminal devices. In other words, the terminal device 1 may select time and frequency resources for one transmission opportunity randomly from the resources belonging to the received preferred resource set for the MAC PDU to be transmitted to the terminal device 1. If there is no sensing result and the preferred resource is provided by another terminal device 1, Terminal device 1 randomly selects a resource from the set of preferred resources provided. The terminal device 1 may use the selected resource to transmit to another terminal device 1. If the terminal device 1 does not have its own sensing result, the terminal device 1 may not be performing sidelink resource allocation mode 2. Sidelink resource allocation mode 2 may also be referred to as a resource sensing procedure.

[0317] The terminal device 1 receives / transmits the preferred resource set and the non-preferred resource set. The sl-InterUE-CoordinationScheme1 that enables 1 has its own sensing results and receives the preferred resource set from other terminal device 1. If it is received, the terminal device 1 compares the received preferred resource set with the side link resource set. In source allocation mode 2, the amount of frequency resources selected from the common resources of the resource set indicated by the physical layer and the amount of sidelink data available for the logical channel are used. Randomly select the time and frequency resources for one transmission opportunity according to the remaining PDB. The terminal device 1 may select the resource from the other terminal that provided the preferred resource set. In other words, the terminal device 1 has sl-InterUE-CoordinationScheme1 configured by RRC, has its own sensing results, and is in the preferred link state. When the source is provided by another terminal device 1, the terminal device 1 selects a resource common to the set of resources selected by its own sensing result and the set of preferred resources provided by the other terminal device 1. Alternatively, the terminal device 1 may randomly select a resource from the available resources and use the selected resource to transmit to the other terminal device 1. If the terminal device 1 has its own sensing results, the terminal device 1 may perform sidelink resource allocation mode 2. Sidelink resource allocation mode 2 may also be referred to as a resource sensing procedure.

[0318] The terminal device 1 receives / transmits the preferred resource set and the non-preferred resource set. The sl-InterUE-CoordinationScheme1 that enables the When the terminal device 1 determines the resources for transmitting Sidelink IUC information by an explicit request from the device 1, the terminal device 1 determines the amount of frequency resources selected from the resources indicated by the physical layer by the resource selection procedure and the remaining amount of Sidelink data available in the logical channel. Randomly selects time and frequency resources for one transmission opportunity according to the PDB. Good too.

[0319] The sl-InterUE-CoordinationScheme1 may be an RRC parameter included in the SL-InterUE-CoordinationConfig. The SL-InterUE-CoordinationConfig is a sidelink IUC parameter may be used to set

[0320] The Sidelink IUC request procedure triggers the peer UE to send Sidelink IUC information. The Sidelink IUC information reporting procedure may be used to provide IUC information to peer UEs. The Sidelink IUC reporting procedure may be triggered by a Sidelink IUC request MAC CE or by a condition. For IUC information transmission triggered by external conditions, unicast of preferred and non-preferred resource sets, and groupcast and broadcast of non-preferred resource sets may be supported. Explicit requests may be indicated by SCI format 2-C.

[0321] The terminal device 1 transmits the determined preferred or non-preferred resource in the SCI format. If SCI format 2-C is used to provide the determined preferred or non-preferred resource to the other terminal device 1, the SCI format The Providing / Requesting indicator field of SCI format 2-C may indicate 0. If the Providing / Request indicator field of SCI format 2-C indicates 0, SCI format 2-C may be used to provide Inter-UE coordination information. A set of preferred or non-preferred resources may be indicated by {r0,r1,r2,...}. The set of preferred or non-preferred resources {r0,r1,r2,...} is used to provide the reference slot t ref and M (TRIV m , FRIV m , P rsvp,m If the higher layer parameter transmissionStructureForPSCCHandPSSCH is not provided, the set of preferred or non-preferred resources {r0,r1,r2,…} is the reference slot t ref and M (TRIV m , FRIV m , P rsvp,m ) If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to contiguousRB, If so, the set of preferred or non-preferred resources {r0,r1,r2,…} is ref and M (TRIV m , FRIV m , P rsvp,m If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to interlaceRB, the set of preferred or non-preferred resources {r0,r1,r2,…} may be denoted by reference slot t ref and M (TRIV m , FRIV m , FRIVRBset,m , P rsvp,m ) The value of m may be between 1 and M. If preferred or non-preferred resources are provided in SCI format 2-C, the value of M may be 2. reference slot t ref The reference slot may be indicated in the reference slot location field of SCI format 2-C. The reference slot may be indicated in the Reference slot field as a combination of the DFN index and slot index. The DFN index may be indicated by the most significant 10 bits (10 MSB) of the Reference slot field. The slot index is indicated by the remaining bits excluding the most significant 10 bits (10 MSB) of the Reference slot field. The number of bits in the Reference Slot field may be determined based on the subcarrier spacing. For example, when the subcarrier spacing is 15 kHz, the number of bits in the Reference Slot field may be determined based on the subcarrier spacing. The number may be 14 bits. The 14 bits are used to represent the DFN index of the Reference slot and the slot The DFN index of the Reference slot may be indicated by the upper 10 bits (10 MSB) of the 14 bits. The DFN index of the Reference slot may be indicated by the lower 4 bits (4 LSB) of the 14 bits. The slot index may also be indicated. m , FRIV m , P rsvp,m ) is SCI format 2-C Each TRIV is indicated by the resource combination field. m may be represented by the upper 9 bits (9 MSB) .FRIV m and P rsvp,m TRIV (if present) m (TRIV m , FRIVm , FRIV RBset,m , P rsvp,m ) is indicated in the resource combination field of SCI format 2-C, and each TRIV m may be represented by the upper 9 bits (9 MSB). m and FRIV RBset,m and P rsvp,m (If it exists (combined) is TRIV m may be indicated following the MAC CE. The terminal device 1 may transmit the determined preferred resource to the other terminal device 1 by MAC CE. The terminal device 1 may transmit the determined non-preferred resource to the other terminal device 1 by MAC CE.

[0322] The set of slots and resource blocks for a PSSCH transmission is determined by the PSCCH transmission with the associated SCI format 1-A. SCI format 1-A contains the Frequency resource assignment field and Time resource assignment fields. The set of resource blocks is defined by the first resource, second resource, and third resource. The Time resource assignment field indicates the time region of the second resource. The Time resource assignment field is used for the second and third resources. The TRIV may indicate the time domain. The TRIV may be the value indicated in the Time resource assignment field. The Frequency resource assignment field may indicate the frequency domain of the second resource. The Frequency resource assignment field may indicate the frequency domain of the second resource and the third resource. The FRIV may be the value indicated in the Frequency resource assignment field. The values ​​shown may be used. PSCCH and PSSCH may be transmitted in the first resource. PSSCH may be transmitted in the first resource. PSSCH may be transmitted in the second resource. PSSCH may be transmitted in the third resource.

[0323] The Time resource assignment field may indicate a Logical slot offset indication of the actual resource. The Time resource assignment field shall be used when sl-MaxNumPerReserve is 2. When sl-MaxNumPerReserve is 3, the Time resource assignment field may indicate a logical slot indication of N=1 or N=2 for the actual resource. N may be the number of actual resources. N may be the number of resources for PSSCH transmission. The Time resource assignment field may indicate a logical slot indication of N=1 or N=2 or N=3 for the actual resource when sl-MaxNumPerReserve is 3. Logical slot The logical slot offset can be a slot that belongs to a resource pool. It can also be the offset of a slot in the spool. The first resource is in SCI format. When N=2, the logical slot offset of the resource pool for the first resource of the second resource may be indicated by t1. When N=2, t1 may be 1 or more and 31 or less. When N=3, the logical slot offset of the resource pool for the first resource of the second resource may be indicated by t1. The logical slot offset of the resource pool for the third resource relative to the first resource may be indicated by t1. When N=3, the logical slot offset of the resource pool for the third resource relative to the first resource may be indicated by t2. When N=3, t1 may be 1 or more and 30 or less. When N=3, t2 may be greater than t1. It may be 31 or less. When N=1, TRIV may be 0. When N=2, TRIV is When N=3, TRIV may indicate a slot offset to determine the slots of the second and third resources. A lot offset may also be indicated.

[0324] FRIV may indicate the starting subchannel index and the number of consecutively allocated subchannels. When sl-MaxNumPerReserve is 2, FRIV indicates the starting subchannel index of the second resource. When sl-MaxNumPerReserve is 3, FRIV indicates the starting subchannel index of the second resource, the starting subchannel index of the third resource, and the number of consecutively allocated subchannels. If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to interlaceRB, the Frequency resource assignment field of SCI format 1-A may include a bit to indicate the RB set information. The Frequency domain assignment field to indicate the RB set information is FRIV. RBset It may also be called FRIV. RBset The starting RB set The index may also indicate the number of consecutively allocated RB sets. When is 2, FRIV RBset The RB set index is allocated consecutively with the starting RB set index of the second resource. When sl-MaxNumPerReserve is 3, FRIV indicates the number of RB sets allocated consecutively to the starting RB set index of the second resource and the starting RB set index of the third resource. It may also indicate the number of allocated RB sets.

[0325] TRIV m and FRIV m and FRIV RBset,m , the following interpretation changes may be made to the Time resource assignment and Frequency resource assignment of SCI format 1-A. -sl-MaxNumPerReserve is fixed at 3. "Slot that received SCI format 1-A" is TRIV m is replaced by the slot shown as the first resource location of . Each TRIV > 1 m The first resource location is the reference slot t ref slot offset t fromm The slot offset t m is indicated in the first resource location field. The first resource location of TRIV1 is slot offset 0 for the reference slot. It is also possible. The starting subchannel of the first resource of each tuple may be indicated separately. · If the upper layer parameter transmissionStructureForPSCCHandPSSCH is set to interlace, the starting RB set of the first resource of each tuple may be indicated separately.

[0326] SCI format 2-C (TRIV m , FRIV m , P rsvp,m ) is sent, (TRIV1, FRIV1, P rsvp,1 ) may be transmitted in SCI format 2-C. m , FRIV m , P rsvp,m )but If sent, (TRIV1, FRIV1, P rsvp,1 ) and (TRIV2, FRIV2, P rsvp,2 ) is SCI format 2-C. Since sl-MaxNumPerReserve is interpreted as fixed at 3 when providing preferred or non-preferred resources, TRIV1 and TRIV2 may indicate the time domain of N=1, N=2, or N=3 resources. N may be the number of preferred or non-preferred resources. (TRIV1, TRIV1, P rsvp,1The slot of the first resource associated with the TRIV2, FRIV2, P may be the slot indicated by the reference slot field of the SCI format 2-C. rsvp,2 The first resource slot associated with (TRIV1, FRIV1, P rsvp,1 ) slot offset t from the slot of the first resource associated with m The slot offset t m is indicated in the first resource location field of SCI format 2-C. This may be done.

[0327] FIG. 11 shows an example of IUC information in the time domain of the terminal device 1 according to one aspect of this embodiment. In FIG. 11, one horizontal square represents one slot. Slot#0 is a slot that belongs to the resource pool and has an index of 0. In FIG. 11, (TRIV1, FRIV1, P rsvp,1 ) and (TRIV2, FRIV2, P rsvp,2 ) the actual number of resources may be N=3 For example, in FIG. 11, 1101 may be a slot indicated in the reference slot field of SCI format 2-C. 1101 may be slot #1. The terminal device 1 determines that 1101 is (TRIV1, FRIV1, P rsvp,1 ) is the slot of the first resource related to The terminal device 1 may receive the following from TRIV1: (TRIV1, TRIV1, P rsvp,1 ) related second resource The terminal device 1 may determine the logical slot offset t1 and logical slot offset t2 from TRIV1. 1102 may be the slot offset indicated by logical slot offset t1. 1102 may be the slot offset indicated by logical slot offset t1. The slot offset from the slot of (TRIV1, FRIV1, P) may be indicated by a slot offset number of 1. rsvp,1 ) exists in Slot #3. 1103 is a slot offset from the slot of the first resource, and may be represented by a slot offset number of 3. The terminal device 1 may determine that the second resource associated with (TRIV1, FRIV1, P rsvp,1 ) exists in slot #5. m and may be indicated by the first resource location field. The slot offset of 1104 may be 4 slots. 1105 is (TRIV2, FRIV2, P rsvp,2 ) 1105 may be slot #6. The terminal device 1 may determine 1105 from 1101 and 1104. 1105 may be a slot that is separated from the slot of 1101 by the slot offset of 1104. The terminal device 1 determines Logical slot offset t3 and Logical slot offset t4 from TRIV2. 1106 determines the slot offset indicated by Logical slot offset t3. 1106 may be (TRIV2, FRIV2, P rsvp,2 ) related first resource The slot offset from the slot of (TRIV2, FRIV2, P rsvp,2 ) exists in Slot #9. rsvp,2 ) related first resource The slot offset from the slot of (TRIV2, FRIV2, P rsvp,2 ) may be determined to exist in Slot #11.

[0328] (TRIV1, FRIV1, P rsvp,1 The Lowest sub-channel index of the first resource associated with TRIV1, FRIV1, P may be indicated in the Lowest sub-channel indices field of SCI format 2-C. rsvp,1 The Lowest RB set index of the first resource associated with (TRIV1, FRIV1, P) may be indicated in the Lowest RB set indices field of SCI format 2-C. rsvp,1 The terminal device 1 may determine the starting positions of the sub-channels of the second resource and the third resource associated with (TRIV1, FRIV1, P rsvp,1 ) may be determined from FRIV1. FRIV1 may be determined by using the lowest sub-channel of the first resource as the frequency domain starting position of the second resource and the third resource. FRIV1 may indicate the number of subchannel offsets from the lowest RB set index of the first resource as the starting position in the frequency domain of the second resource and the third resource. FRIV1 may indicate the number of subchannel offsets from the lowest sub-channel index of the first resource as the starting position in the frequency domain of the second resource. FRIV1 may indicate the number of RB set offsets from the lowest RB set index of the first resource as the starting position in the frequency domain of the second resource. FRIV1 may indicate the number of RB set offsets from the lowest RB set index of the first resource as the starting position in the frequency domain of the third resource. FRIV1 may indicate the offset number of subchannels from the third resource index. The starting position in the frequency domain is the offset of the RB set from the lowest RB set index of the first resource. The number of sets may be indicated. (TRIV2, FRIV2, P rsvp,2 The Lowest sub-channel index of the first resource associated with the TRIV2, FRIV2, P may be indicated in the Lowest sub-channel indices field of SCI format 2-C. rsvp,2 The Lowest RB set index of the first resource associated with (TRIV2, ) may be indicated in the Lowest RB set indices field of SCI format 2-C. FRIV2, P rsvp,2 ) related to the second resource and third resource sub-channel opening The terminal device 1 may determine the starting position from FRIV2. rsvp,2) may be determined from FRIV2. FRIV2 may indicate the number of subchannel offsets from the lowest sub-channel index of the first resource as the frequency domain starting positions of the second resource and the third resource. FRIV2 may indicate the number of RB set offsets from the lowest RB set index of the first resource as the frequency domain starting positions of the second resource and the third resource. FRIV2 may indicate the number of subchannel offsets from the lowest sub-channel index of the first resource as the frequency domain starting positions of the second resource. The offset of the RB set from the lowest RB set index of the first resource is used as the starting position of the number area. FRIV2 may indicate the number of sub-channels offset from the lowest sub-channel index of the first resource as the starting position of the third resource in the frequency domain. FRIV2 may indicate the number of RB sets offset from the lowest RB set index of the first resource as the starting position of the third resource in the frequency domain. The number of sub-channels consecutively allocated to the first resource / second resource / third resource is determined for the IUC information request. The subchannels indicated by the Number of subchannels field included in the SCI format 2-C sent for It can be the number of channels. The number of RB sets allocated may be the number of subchannels indicated in the Number of RB sets field included in the SCI format 2-C transmitted for the IUC information request.

[0329] The IUC information (preferred resource or non-preferred resource) determined by the terminal device 1 may be notified to other terminal devices 1 by MAC CE. The notification method by MAC CE is as follows: The terminal device 1 notifies the other terminal device 1 of the IUC information by MAC CE. In this case, M may be selected to be 2 or greater.

[0330] When the terminal device 1 determines the non-preferred resource, the terminal device 1 A resource indicated by a typical request that satisfies at least one of the following conditions 1 and 2. Resources in the selection window may be considered non-preferred resources. ·Condition 1: Resources indicated by SCI format 1-A received from other terminal device 1 that meet at least one of the following criteria 1 and 2. Criterion 1: RSRP measurement of received SCI format 1-A is performed and RSRP is Th(prio RX ) higher. RX may be the value indicated in the Priority field of the received SCI format 1-A. i ) may be set to the corresponding value of the RSRP threshold indicated in the k-th field of sl-ThresholdRSRP-Condition1-B-1-Option1List. k is the number of i may be. - Criterion 2: Terminal device 1 receives SCI format 1-A related transceiver from other terminal device 1. The destination UE of the port block, and RSRP measurement of the received SCI format 1-A is performed, and RSRP is Th'(prio RX ) lower. RX is indicated in the Priority field of the received SCI format 1-A sl-Threshold may be set to the corresponding value of the RSRP threshold indicated in the k-th field of RSRP-Condition1-B-1-Option2List. k is the number of i may be. Condition 2: Terminal device 1 is a non-preferred resource for the transport of a transmission If the block is the destination, the terminal device 1 receives the sidelink in half duplex operation. A resource in a slot that is not expected to perform a communication. p i may be the value indicated in the Priority field of the received SCI format 1-A. sl-ThresholdRSRP-Condition1-B-1-Option1List may be an RRC parameter. sl-ThresholdRSRP-Condition1-B-1-Option1List is a parameter included in SL-InterUE-CoordinationScheme1. sl-ThresholdRSRP-Condition1-B-1-Option1List is the RSRP measurement value. sl-ThresholdRSRP-Condition1-B-1-Option2List indicates the RSRP threshold used to determine the reserved resources of other terminal devices 1 for which sl-ThresholdRSRP-Condition1-B-1-Option2List is greater than the threshold as a set of non-preferred resources for transmission by UE-B under condition 1-B-1 of scheme 1. sl-ThresholdRSRP-Condition1-B-1-Option2List may be an RRC parameter. sl-ThresholdRSRP-Condition1-B-1-Option2List may be a parameter included in SL-InterUE-CoordinationScheme1. sl-ThresholdRSRP-Condition1-B-1-Option2List indicates the RSRP threshold used to determine the reserved resources of other terminal devices 1 for which sl-ThresholdRSRP-Condition1-B-1-Option2List is greater than the threshold as a set of non-preferred resources for transmission by UE-B under condition 1-B-1 of scheme 1. The RSRP threshold used to determine the reserved resources of other terminal device 1 whose measurement values ​​are smaller than the threshold as a set of non-preferred resources for UE-B's transmission in condition 1-B-1 of scheme 1 is The resource selection window may be indicated by SCI format 2-C. When an explicit request is made from another terminal device 1, the terminal device 1 determines a non-preferred resource. An explicit request is made in SCI format 2-C when a non-preferred resource is requested. An explicit request may be made in SCI format 2-C using the preferred The resource may be requested. The non-preferred resource may be determined in the resource selection procedure for determining IUC information. The non-preferred resource may be determined in the sixth step of the resource selection procedure for determining IUC information.

[0331] The terminal device 1 transmits PSCCH / PSSCH using resources that the terminal device 1 itself is not sensing. When transmitting PSCCH / PSSCH, the terminal device 1 may apply the default CPE starting position to PSCCH / PSSCH transmission. When performing sensing, multiple CPE starting positions may be applied to PSCCH / PSSCH transmission. The resources that the terminal device 1 itself is not sensing may be preferred resources provided by other terminal devices 1. The resources that the terminal device 1 itself is not sensing may be The resources may be resources scheduled by the base station using DCI format 3-0. The resources that the terminal device 1 itself is not sensing may be resources randomly selected from time and frequency resources for one or more transmission opportunities from available resources when transmission based on random selection is configured in a higher layer and available resources remain in the resource pool for more transmission opportunities.

[0332] If the resource used by the terminal device 1 for PSCCH / PSSCH transmission is a resource selected from a set of preferred resources received from another terminal device 1, a default CPE starting position is applied to the resource. If the resource used by the terminal device 1 for PSCCH / PSSCH transmission is a resource selected from a set of preferred resources received from another terminal device 1, a default CPE starting position is applied to the resource. Multiple CPE starting positions are applied to the source. The resources used by the terminal device 1 for PSCCH / PSSCH transmission are selected from the set of preferred resources received from other terminal devices 1. If the selected resource is a resource for which there is no sensing result of the terminal device 1 itself, the default CPE starting position is applied to the resource. If the resource used by the terminal device 1 for PSCCH / PSSCH transmission is a resource for which there is a sensing result of the terminal device 1 itself, the default CPE starting position is applied to the resource based on the sensing result. Alternatively, multiple CPE starting positions are applied. The resources used by the terminal device 1 for PSCCH / PSSCH transmission are selected from the set of preferred resources received from other terminal devices 1. If the resource is a source and has a sensing result of the terminal device 1 itself, the terminal device 1 determines the default CPE starting position or multiple CPEs for the resource based on the sensing result. CPE starting positions are applied. Resources used by terminal device 1 for PSCCH / PSSCH transmission is not a resource selected from the set of preferred resources and is not part of its own sensitivity If there is no matching result for a resource, the default CPE starting position for that resource is used. is applied. If the resource used by the terminal device 1 for PSCCH / PSSCH transmission is not a resource selected from the set of preferred resources and the resource does not have its own sensing result, it may be a resource scheduled in DCI format 3_0. If the resource used by the terminal device 1 for PSCCH / PSSCH transmission is not a resource selected from the set of preferred resources and the resource does not have its own sensing result, it may be a resource selected randomly from an available resource pool.

[0333] In the first embodiment of the present invention, the terminal device 1 does not have its own sensing results. First, when receiving a set of preferred resources from another terminal device 1 and transmitting PSCCH / PSSCH using resources selected from the received set of preferred resources, the terminal device 1 applies the default CPE starting position to the PSCCH / PSSCH transmission. If the terminal device 1 receives a set of preferred resources from another terminal device 1, the terminal device 1 The terminal device 1 can select resources from the set of preferred resources received from the terminal device 1 and perform PSCCH / PSSCH transmission. The terminal device 1 is configured by RRC with sl-InterUE-CoordinationScheme1 that enables reception / transmission of the preferred resource set and the non-preferred resource set, and the terminal device 1 does not have its own sensing result and receives a preferred resource set from another terminal device 1. When receiving a set of resources, the terminal device 1 uses the preferred resource received from the other terminal device 1. A terminal device can select resources from a set of resources to perform PSCCH / PSSCH transmission. When the terminal device 1 does not have a sensing result, it may be that the terminal device 1 is not performing sidelink resource allocation mode 2. When the terminal device 1 does not have a sensing result, it may be that the terminal device 1 is not performing sensing on a resource in sidelink resource allocation mode 2. The resource for which the terminal device 1 does not have a sensing result in sidelink resource allocation mode 2 may be a resource related to a slot not being monitored within the sensing window. The resource related to a slot not being monitored within the sensing window may be a resource related to a slot not being monitored within the sensing window after the candidate resource is eliminated in the fifth step of the resource selection procedure of sidelink resource allocation mode 2, and the eliminated candidate resource is again selected as a candidate resource in step 5a) of the resource selection procedure. For example, in FIG. 8, 810 is a resource The resource may be excluded from the set SA in the fifth step of the source selection procedure and may be set again as a candidate resource in the set SA in step 5a) of the resource selection procedure. In this case, 810 may be a resource related to a slot that is not being monitored within the sensing window. In other words, the resource related to a slot that is not being monitored within the sensing window is a resource that belongs to a slot on a cycle from the slot in which the terminal device 1 transmitted within the sensing window and could not be monitored by half duplex operation. The sl-InterUE-CoordinationScheme1 may be an RRC parameter included in the SL-InterUE-CoordinationConfig. The sl-InterUE-CoordinationScheme1 may be a parameter including sl-Condition1-A-2-r17, sl-ThresholdRSRP-Condition1-B-1-Option1List-r17, sl-ThresholdRSRP-Condition1-B-1-Option2List-r17, etc. Terminal device The terminal device 1 receives a set of preferred resources from the other terminal device 1, and the terminal device 1 If the terminal device 1 has the matching result, the terminal device 1 compares the received set of preferred resources with the The common resources are selected from the set of resources obtained from the sensing results of the individual users as PSCCH / PSSCH. The terminal device 1 receives a set of preferred resources from another terminal device 1. If the terminal device 1 has its own sensing results, the terminal device 1 selects a set of preferred resources common to the set of resources obtained from its own sensing results. If there is no resource, the terminal device 1 selects a resource for PSCCH / PSSCH transmission from a set of resources obtained from its own sensing result. When the resource having the sensing result is used for PSCCH / PSSCH transmission, the sensing The terminal device 1 may determine the CPE starting position based on the sensing result. If the terminal device 1 has the sensing result, the terminal device 1 may be performing sidelink resource allocation mode 2. When the terminal device 1 determines the CPE starting position based on the sensing result, the terminal device 1 may apply the default CPE starting position to transmission in the slot and RB set(s) in which reserved resources are detected. When determining the CPE starting position based on the sensing result, the terminal device 1 may apply a default CPE starting position to transmission in a slot and RB set(s) in which its own reserved resources exist. When determining the CPE starting position based on the sensing result, the terminal device 1 may apply multiple CPE starting positions if its own reserved resources do not exist in the slot and RB set(s) in which PSCCH / PSSCH transmission is performed and reserved resources of other terminal devices 1 are not detected. For example, when UE-A receives a preferred resource set from UE-B and UE-A does not have its own sensing result, UE-A may select resources from the preferred resource set received from UE-B and apply a default CPE starting position to PSCCH / PSSCH transmission in the selected resources.

[0334] FIG. 12 is a flowchart showing a process in which a terminal device 1 according to an embodiment of the present invention determines a CPE starting position. 1 is a diagram illustrating an example of a process for receiving a preferred resource from another terminal device 1. The terminal device 1 receives the set of the sensing results (S1201). The terminal device 1 determines whether or not the terminal device 1 has detected the result of its own sensing (S1202). If it is determined that the terminal device 1 does not have the result (step S1202: NO), the terminal device 1 The terminal device 1 selects a resource for PSCCH / PSSCH transmission from the set of preferred resources received from the terminal device 1, and applies the default CPE starting position to the PSCCH / PSSCH transmission in the selected resource (S1203). If so (step S1202: YES), the terminal device 1 determines the CPE starting position based on its own sensing result (S1204).

[0335] As described above, in the embodiment of the present invention, the terminal device 1 does not have its own sensing result and selects a resource from a set of preferred resources received from another terminal device 1. However, when transmitting PSCCH / PSSCH, the terminal device 1 applies the default CPE starting position to the PSCCH / PSSCH transmission. In slots and RB set(s) in which the terminal device 1 does not have its own sensing results, the CPE starting position in PSCCH / PSSCH transmission can be determined. There is a possibility that a reserved resource of another terminal device 1 exists, and the terminal device 1 applies the default CPE starting position to the PSCCH / PSSCH transmission, thereby blocking the PSCCH / PSSCH transmission of the other terminal device 1. This can avoid having to check.

[0336] In the second embodiment of the present invention, the terminal device 1 does not have its own sensing results. First, when receiving a set of preferred resources from another terminal device 1 and performing PSCCH / PSSCH transmission on resources selected from the received set of preferred resources, the terminal device 1 applies multiple CPE starting positions to PSCCH / PSSCH transmission. The terminal device 1 determines a CPE starting position corresponding to L1 priority from the multiple CPE starting positions for resources selected from the set of preferred resources, and applies this to PSCCH / PSSCH transmission on the selected resources. The terminal device 1 does not have its own sensing results, and when receiving a preferred resource from another terminal device 1, When the terminal device 1 receives a set of preferred resources from another terminal device 1, the terminal device 1 The terminal device 1 can select resources from the set of resources and perform PSCCH / PSSCH transmission. In this case, if sl-InterUE-CoordinationScheme1, which enables reception / transmission of preferred and non-preferred resource sets, is configured by RRC, and the terminal device 1 does not have its own sensing results and receives a set of preferred resources from another terminal device 1, the terminal device Terminal device 1 selects a resource from the set of preferred resources received from other terminal device 1. If the terminal device 1 does not have a sensing result, PSCCH / PSSCH transmission can be performed. In this case, the terminal device 1 may not be performing sidelink resource allocation mode 2. The terminal device 1 receives a set of preferred resources from another terminal device 1, and If the terminal device 1 has its own sensing result, the terminal device 1 The terminal device 1 receives a set of preferred resources from another terminal device 1, and when the terminal device 1 has its own sensing results, the terminal device 1 uses the common resources from the received set of preferred resources and the set of resources obtained from its own sensing results for PSCCH / PSSCH transmission. If there is no resource common to the set of resources, the terminal device 1 selects a resource for PSCCH / PSSCH transmission from the set of resources obtained from its own sensing result. When using resources with their own sensing results for PSCCH / PSSCH transmission, The CPE starting position may be determined based on the sensing result of the terminal device 1. If UE-A has the sensing result, the terminal device 1 may be performing sidelink resource allocation mode 2. For example, UE-A receives a preferred resource set from UE-B. If UE-A receives a resource from UE-B and does not have its own sensing results, UE-A may select resources from the preferred resource set received from UE-B and apply multiple CPE starting positions to PSCCH / PSSCH transmission on the selected resources. UE-A may determine a CPE starting position corresponding to L1 priority from the multiple CPE starting positions and apply it to PSCCH / PSSCH transmission on the selected resources.

[0337] In a third embodiment according to the present invention, when a terminal device 1 does not have its own sensing result, receives a set of preferred resources from another terminal device 1, and performs PSCCH / PSSCH transmission using resources selected from the received set of preferred resources, the terminal device 1 transmits the PSCCH / PSSCH using the resources notified from the other terminal device 1. The CPE starting position is determined based on the reserved information received from the other end. Indicates whether the terminal device 1 has detected a reserved resource in the determined preferred resource. When the terminal device 1 does not have its own sensing result, receives a set of preferred resources from another terminal device 1, and performs PSCCH / PSSCH transmission on resources selected from the received set of preferred resources, the terminal device 1 may receive reserved information related to the selected resources. The CPE starting position is determined based on the information. If the resource selected by the terminal device 1 from the set of preferred resources is a resource for which a reserved resource is detected, the default CPE starting position is applied. If the resource selected by the terminal device 1 from the set of preferred resources is a resource for which a reserved resource is not detected, multiple CPE starting positions are applied. The reserved information may be notified in SCI format 2-C. The reserved information may be notified in MAC CE. The reserved information is notified in SCI format 2-C. The reserved information may be signaled together with the preferred resource at the MAC CE. The number of bits of reserved information is the number of resources in the set of preferred resources. The number of bits of reserved information may be determined based on the number of preferred resources. The number of bits of reserved information may be determined based on the maximum number of resources that can be included in the set of preferred resources. The reserved information is assigned to the preferred resource in order from the most significant bit. For example, when IUC scheme 1 is performed between UE-A and UE-B, UE-A receives a set of preferred resources and reserved information from UE-B. In the procedure for selecting preferred resources, UE-B selects resource #1, resource #2, and resource #3 as the preferred resources. If UE-B does not detect a reserved resource of another terminal device 1 in resource #1 and resource #3, but detects a reserved resource of another terminal device 1 (UE-C) in resource #2, it may determine 010 as the reserved information. 0 indicates the corresponding preferred resource. may indicate that the reserved resource was not found. UE-B may indicate that a reserved resource has been detected on the resource. UE-A provides UE-B with the reserved information for resource #1, resource #2, and resource #3 as a preferred resource. UE-A then performs time domain synchronization in the set of preferred resources provided by UE-B. Resource indices may be assigned in ascending order of index. The ascending order of the slot index may be the ascending order. When multiple preferred resources exist in the same time domain, resource indexes may be assigned in the ascending order of the starting index in the frequency domain of the preferred resources. The ascending order of the starting index in the frequency domain may be the ascending order of the subchannel index. The ascending order of the starting index in the frequency domain may be the ascending order of the RB set index. The ascending order of the starting index in the frequency domain may be the descending order of the RB set index and the subchannel index. In other words, If a resource set is a set of resources belonging to slot index #3 and starting from subchannel index #3, resources belonging to slot index #1 and starting from subchannel index #1, and resources belonging to slot index #3 and starting from subchannel index #1, then the subchannels belonging to slot index #1 The resource starting from index #1 is called resource index #1, the resource belonging to slot index #3 starting from subchannel index #1 is called resource index #2, the resource belonging to slot index #3 starting from subchannel index #3 is called resource index #4, and the resource belonging to slot index #4 starting from subchannel index #5 is called resource index #6. The reserved information may be assigned as resource index #3. The most significant bit may correspond to resource index #1. The second bit of the reserved information may correspond to resource index #2. The third bit of the reserved information may correspond to resource index #3. When UE-A selects the resource with resource index #1 for PSCCH / PSSCH transmission, the reserved information indicates 0, so UE-A applies multiple CPE starting positions to the PSCCH / PSSCH transmission with resource index #1. When UE-A selects a resource with resource index #2 for PSCCH / PSSCH transmission, the reserved information indicates 1, so UE-A applies the default CPE starting position to PSCCH / PSSCH transmission of resource index #2. When UE-A selects a resource with resource index #3 for PSCCH / PSSCH transmission, the reserved information indicates 0, so UE-A applies multiple CPE starting positions to PSCCH / PSSCH transmission of resource index #3. The maximum number of preferred resources that can be notified in SCI format 2-C may be 6. The number of bits in the reserved information field included in SCI format 2-C may be 6. Maximum 6 preferred resources (TRIV1FRIV1P rsvp,1 ) and (TRIV2FRIV2P rsvp,2 ) For example, (TRIV1FRIV1P rsvp,1 ) and (TRIV2FRIV2P rsvp,2 ) have two actual resources (N=2), the number of preferred resources notified by SCI format 2-C is four. rsvp,1 )'s third resource and (TRIV2FRIV2P rsvp,2 The reserved information bit corresponding to the third resource in (TRIV1FRIV1P) may be ignored. rsvp,1 ) and (TRIV2FRIV2P rsvp,2 ) have two actual resources (N=2), then (TRIV1FRIV1P rsvp,1 )'s third resource and (TRIV2FRIV2P rsvp,2The third bit (0) and the sixth bit (1) corresponding to the third resource of UE-B may be ignored because there is no corresponding resource. The ignored reserved information bits may contain 0 or 1. The base station notifies the terminal device 1 performing sidelink resource allocation mode 1 in the same notification method as the reserved information of UE-B of the other end of the resource corresponding to the PSCCH / PSSCH transmission scheduled in DCI format 3-0. The terminal device 1 may indicate whether or not the terminal device 1 is transmitting PSCCH / PSSCH. The terminal device 1 determines the resources to be transmitted by the terminal device 1 from the resources indicated in DCI format 3-0 and the reserved information in the same way as UE-A. It is determined whether or not another terminal device 1 exists, and if another terminal device 1 exists, the default CPE starting position is applied, and if another terminal device 1 does not exist, multiple CPE starting positions are applied.

[0338] As described above, in the embodiment of the present invention, the terminal device 1 does not have its own sensing result and selects a resource from a set of preferred resources received from another terminal device 1. However, when transmitting PSCCH / PSSCH, the terminal device 1 determines the CPE starting position based on the reserved information and applies it to the PSCCH / PSSCH transmission. Determine the CPE starting position for PSCCH / PSSCH transmission on resources not in use In transmission in slots and RB set(s) for which the terminal device 1 does not have its own sensing results, the CPE starting position is determined based on reserved information indicated by other terminal devices 1, thereby making it possible to avoid blocking of PSCCH / PSSCH transmission between terminals. can.

[0339] The preferred resource set is a set of resources that are used for sidelink transmission of the terminal device 1. The preferred resources may be a set of resources that are preferentially selected for The non-preferred resource set may be a resource that is preferentially selected for sidelink transmission of the terminal device 1. The non-preferred resource set may be a resource that is preferentially selected for sidelink transmission of the terminal device 1. The non-preferred resources may be a set of resources excluded from resources selected for sidelink transmission of the terminal device 1. For example, UE-A receives a set of preferred resources from UE-B. UE-A then selects resources for sidelink transmission from the set of preferred resources. When UE-A receives a set of non-preferred resources from UE-B, UE-A selects resources for sidelink transmission by excluding resources included in the set of non-preferred resources. Transport blocks may be transmitted on preferred resources. stomach.

[0340] When a procedure for determining a set of preferred or non-preferred resources is triggered and parameters for determining a set of preferred or non-preferred resources are provided from an upper layer, the terminal device 1 selects a resource selection procedure for determining IUC information. The terminal device 1 determines the IUC information using parameters provided from the upper layer. The determined IUC information may be provided to other terminal devices 1. The trigger of the procedure for determining the set of preferred or non-preferred resources of the terminal device 1 is Therefore, it may be performed.

[0341] The terminal device 1 that provides IUC information may be referred to as UE-A. The terminal device 1 that requests IUC information may be referred to as UE-B. The terminal device 1 that requests IUC information may be referred to as UE-A. The terminal device 1 that provides IUC information may be referred to as UE-B. A terminal device 1 other than UE-A and UE-B may be referred to as another terminal device 1. The other terminal device 1 may be a terminal device 1 other than UE-A and UE-B. In other words, the other terminal device 1 does not perform IUC. The terminal device 1 performing IUC with UE-A may be referred to as UE-B or peer UE. The terminal device 1 performing IUC with UE-B may be referred to as UE-A or peer UE. Requests for information may be made under IUC scheme 1. Provision of IUC information may be made under IUC scheme 1. This may be done.

[0342] A PSCCH / PSSCH transmission may be a transmission that includes a PSCCH and a PSSCH. It may be a transmission of.

[0343] When the terminal device 1 does not have its own sensing result, it may be that the terminal device 1 is not performing sidelink resource allocation mode 2. When the terminal device 1 does not have its own sensing result, it may be that the terminal device 1 is not performing sensing in sidelink resource allocation mode 2. Sensing may be performed during a period in which the terminal device 1 is not performing sensing in sidelink resource allocation mode 2. The sensing may be performed during a period in which the terminal device 1 is not performing sensing in the PSSCH resource selection of the sidelink resource allocation mode 2. The sidelink resource allocation mode 2 may be referred to as a resource selection procedure. The sidelink resource allocation mode 2 may be referred to as a resource selection procedure. The sidelink resource allocation mode 2 may be referred to as a resource sensing procedure. The resource selection procedure may be referred to as a resource sensing procedure. Half duplex operation refers to the operation of either transmitting or receiving at a given time. Half duplex operation means that transmission and reception cannot be performed at the same time. This may be the case.

[0344] This embodiment may be performed in an unlicensed band where channel sensing is performed. The unlicensed band may also be referred to as a shared spectrum. The unlicensed band may also be referred to as an unlicensed spectrum.

[0345] The base station device 3 and the terminal device 1 according to the embodiment of the present invention may operate as a program that controls a CPU (Central Processing Unit) or the like (a program that makes a computer function) so as to realize the functions of the above-described embodiment of the present invention. 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.

[0346] 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.

[0347] The term "computer system" as used herein 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. The term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as hard disks built into the computer system. This refers to storage devices such as hard disks.

[0348] 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.

[0349] 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.

[0350] 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.

[0351] Furthermore, the base station device 3 in the above-described embodiment is an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-described embodiment may be configured to It may have some or all of the functions of its higher-level node.

[0352] 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 may be realized as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually integrated into a chip, or part or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, but may be a dedicated circuit, It may also be realized by a general-purpose processor. In addition, with the advancement of semiconductor technology, it may be replaced by an LSI. When integrated circuit technology emerges, it is also possible to use integrated circuits based on that technology.

[0353] 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.

[0354] 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 invention. Furthermore, the present invention is susceptible to various modifications 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 invention. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included. [Explanation of symbols]

[0355] 1(1A, 1B, 1C) Terminal equipment 3(3A, 3B, 3C) Base station equipment 10, 30 Radio transmitter / receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 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 receiving unit for receiving a set of preferred resources from another terminal device; If the terminal device does not have its own sensing results and selects a resource from the set of preferred resources, a transmitting unit that, when transmitting a PSCCH / PSSCH using selected resources, applies a default CPE starting position to the PSCCH / PSSCH transmission and transmits the PSCCH / PSSCH.

2. A communication method used in a terminal device, in which a set of preferred resources is received from another terminal device When the terminal device does not have its own sensing result and When PSCCH / PSSCH transmission is performed on resources selected from the set, applying a default CPE starting position to the PSCCH / PSSCH transmission and transmitting.

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