Terminal device and communication method

Abstract

A terminal device is provided with a transmission unit for sensing a channel by maintaining a contention window size applied last time with respect to a sidelink transmission in which HARQ-ACK feedback is disabled, and for transmitting the channel to the terminal device when the number of times that the contention window size has been maintained becomes a predetermined number of times that the contention window size has been maintained becomes the predetermined number of times. And setting the size of the contention window as the next large value.

Description

Technical Field

[0001] The present invention relates to a terminal device and a communication method. This application claims priority to Japanese Patent Application No. 2022-156104 filed in Japan on September 29, 2022, and the contents are incorporated herein by reference. Background Art

[0002] In the 3rd Generation Partnership Project (3GPP), wireless access methods and wireless networks for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)" or "Evolved Universal Terrestrial Radio Access (EUTRA)") are studied. In LTE, the base station device is also called eNodeB (evolved NodeB), and the terminal device is also called UE (User Equipment). LTE is a cellular communication system that configures the area covered by multiple base station devices in a cell shape. A single base station device can manage multiple service cells.

[0003] In 3GPP, the next-generation standard (NR: New Radio) is being studied and standardized as a communication method for 5G. NR is required to meet the requirements of the following three scenarios in a single technical framework: eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication).

[0004] NR supports sidelink technology that allows direct communication between terminal devices without going through a base station device. In addition, the application of sidelink technology in unlicensed spectrum is being studied (Non-Patent Document 1). Prior art literature 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 that the invention aims to solve

[0006] In the unlicensed band, in order to coexist with other systems, LBT (Listen Before Talk) based on CCA (Clear Channel Assessment) is used. In Japan, Europe, etc., the LBT function is required for systems operating in the unlicensed band of the 5GHz band. One embodiment of the present invention provides a terminal device that can achieve fair channel access in an environment where devices (terminal devices, base station devices, access points, etc.) of multiple systems can be mixed together, and a communication method for the terminal device. Solutions for solving problems

[0007] (1) A first scheme of the present invention is a terminal device, which comprises: a sending unit, the sending unit determines a contention window size, applies the contention window size to channel sensing, and performs a first side link transmission, and the sending unit determines the contention window size based on a first number of second side link transmissions in which HARQ-ACK feedback is disabled.

[0008] (2) A second solution of the present invention is a communication method for a terminal device, which determines a contention window size, applies the contention window size to channel sensing, and performs a first side link transmission. In the method, the contention window size is determined based on the first number of second side link transmissions in which HARQ-ACK feedback is disabled. Effects of the Invention

[0009] According to one aspect of the present invention, communication between terminal devices can be performed while achieving fair channel access. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. Figure 2 This is a schematic diagram showing an example of a resource grid in a subframe according to one scenario of the present embodiment. Figure 3 It is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. Figure 4 It is a schematic block diagram showing the configuration of the base station device 3 according to one aspect of the present embodiment. Figure 5 This is a diagram showing an example of interlaced mapping according to one aspect of the present embodiment. Figure 6 This is a diagram showing an example of the configuration of the PSCCH monitored in the terminal device 1 according to one scheme of the present embodiment. Figure 7 This is a diagram showing an example of the configuration of the PSCCH monitored in the terminal device 1 according to one scheme of the present embodiment. Figure 8 This is a diagram showing an example of side link transmission performed in the terminal device 1 according to one aspect of the present embodiment. Fig. 9 This is a diagram showing an example of side link transmission performed in the terminal device 1 according to one aspect of the present embodiment. Fig.10 This is a diagram showing an example of setting a contention window size of a terminal device according to one aspect of the present embodiment. DETAILED DESCRIPTION

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

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

[0013] The parameter or information indicating one or more values ​​may be the parameter or the information at least including the 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 also be an information element (IE: Information Element) including multiple parameters.

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

[0015] The base station device 3 can be configured to include one or both of MCG (Master Cell Group) and SCG (Secondary Cell Group). MCG is a group of service cells configured to include at least PCell (Primary Cell). SCG is a group of service cells configured to include at least PSCell (Primary Secondary Cell). PCell is a cell (implemented cell) in which the initial connection establishment procedure (initial connection establishment procedure) or the connection re-establishment procedure (connection re-establishment procedure) is implemented by the terminal device 1. PSCell is a service cell in which the random access procedure is implemented by the terminal device 1. MCG can also be configured to include one or more SCells (Secondary Cell). SCG can also be configured to include one or more SCells. A serving cell identifier (serving cell identity) is a short identifier used to identify a serving cell. The serving cell identifier can be given by an upper layer parameter.

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

[0017] The base station device 3 uses different frequency bands (carrier frequencies, spectrums) to communicate with the terminal device 1. This operation (multi-carrier operation) may be referred to as carrier aggregation or dual connection. Different cells (service cells) use different frequency bands. In the base station device 3 and the terminal device 1, for multiple cells used in carrier aggregation, one cell may use a downlink frequency band and an uplink frequency band, and other cells may only use a downlink frequency band, or other cells may also use a downlink frequency band and an uplink frequency band. The terminal device 1 makes an initial connection with the base station device 3, and after establishing a connection with the base station device 3, adds connections to multiple cells. The terminal device 1 adds a frequency band for communication. The terminal device 1 adds a cell (service cell) for communication. The terminal device 1 adds a connection with the base station device 3.

[0018] Terminal device 1A and terminal device 1B use side link technology for direct communication. 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 use side link technology for direct communication. Terminal device 1C and terminal device 1D use side link technology for direct communication. Terminal device 1C and terminal device 1D are located outside the coverage of base station device 3 (Out of coverage). There are the following three situations: direct communication between terminal devices 1 within the coverage, direct communication between terminal device 1 within the coverage and terminal device 1 outside the coverage, and direct communication between terminal devices 1 outside the coverage.

[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 Multiplex) may be used in the downlink of the wireless communication system. In addition, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplex) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which transform precoding is applied before signal generation in CP-OFDM. Here, transform precoding is also referred to as DFT precoding.

[0020] The side link between the terminal apparatus 1 and the terminal apparatus 1 may use CP-OFDM. In addition, the side link between the terminal apparatus 1 and the terminal apparatus 1 may also use DFT-s-OFDM.

[0021] like Figure 1 As shown, the base station device 3 can be composed of a transceiver (or a transmission point, a transmission device, a receiving point, a receiving device, a transceiver point). On the other hand, in some cases, the base station device 3 can also be configured to include multiple transceivers. In the case where the base station device 3 is composed of multiple transceivers, each of the multiple transceivers can be configured at a geographically different location.

[0022] For a certain subcarrier spacing setting μ, the subcarrier spacing (SCS: SubCarrier Spacing) Δf can be Δf=2 μ× 15kHz. For example, the subcarrier spacing setting μ may represent any one of 0, 1, 2, 3, and 4.

[0023] Time unit (time unit) T c =1 / (Δf max ×N f ) can be used to represent the length of the time domain. Here, it can be Δf max =480kHz. In addition, it can be N f =4096. In addition, the constant κ can be κ=Δf max ×N f / (Δf ref N f，ref )=64. In addition, Δf ref It can be 15kHz. f，ref It is 2048.

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

[0025] The transmission of the side link signal may be organized into a radio frame (system frame, frame) of length Tf. Here, Tf = (Δfmax × Nf / 100) × Ts = 10 ms.

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

[0027] As a unit of the time domain of the communication method used in the wireless communication system, an OFDM symbol is used. For example, an OFDM symbol can be used as a unit of the time domain of CP-OFDM. In addition, an OFDM symbol can also be used as a unit of the time domain of DFT-s-OFDM.

[0028] A time slot may be configured to include a plurality of OFDM symbols. For example, a time slot may be configured to include Nslotsymb consecutive OFDM symbols. For example, in a conventional CP (Cyclic Prefix) setting, Nslotsymb=14 may be configured. In addition, in an extended CP setting, Nslotsymb=12 may be configured.

[0029] The time slots may be indexed in the time domain. For example, the time slot index nμs may be given in ascending order in the range of integer values ​​from 0 to Nsubframe, μslot-1 in the subframe. In addition, the time slot index nμs,f may also be given in ascending order in the range of integer values ​​from 0 to Nframe, μslot-1 in the radio frame.

[0030] Figure 2 FIG. 1 is a diagram showing an example of a resource grid configuration according to one embodiment of the present invention. Figure 2 In the resource grid, the horizontal axis is the OFDM symbol index lsym, and the vertical axis is the subcarrier index ksc. Figure 2 The resource grid includes Nsize, μgrid,x×NRBsc subcarriers, including Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid,x represents the bandwidth of the SCS-specific carrier. In addition, the value of Nsize, μgrid,x is in resource blocks.

[0031] In the resource grid, the resources identified by the subcarrier index ksc and the OFDM symbol index lsym are also called resource elements (RE: Resource Element).

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

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

[0034] The BWP set for the side link is also called the side link BWP.

[0035] Carrier aggregation may be the use of multiple aggregated service cells for communication. In addition, carrier aggregation may also be the use of multiple aggregated component carriers for communication. In addition, carrier aggregation may also be the use of multiple aggregated downlink component carriers for communication. In addition, carrier aggregation may also be the use of multiple aggregated uplink component carriers for communication.

[0036] Hereinafter, a configuration example of the terminal device 1 according to one aspect of the present embodiment will be described.

[0037] Figure 3 This is a schematic block diagram showing the configuration of a terminal device 1 according to one embodiment of the present invention. As shown in the figure, the terminal device 1 is configured to include a wireless transceiver unit 10 and an upper layer processing unit 14. The wireless transceiver unit 10 is configured to include at least a part or all of an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 is configured to include at least a part or all of a media access control layer processing unit 15 and a wireless resource control layer processing unit 16. The wireless transceiver unit 10 is also referred to as a transmitting unit, a receiving unit, or a physical layer processing unit.

[0038] The wireless transceiver 10 performs physical layer processing.

[0039] For example, the wireless transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block distributed by an upper layer on a UL-SCH (Uplink-Shared CHannel) may be configured in the uplink physical channel. For example, the wireless transceiver 10 may generate a baseband signal of an uplink physical signal.

[0040] For example, the wireless transceiver 10 may attempt to detect information transmitted through a downlink physical channel. Here, a transport block in the information transmitted through a downlink physical channel may be distributed to an upper layer on a DL-SCH (Downlink-Shared CHannel). For example, the wireless transceiver 10 may attempt to detect information transmitted through a downlink physical signal.

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

[0042] The receiving unit of the terminal device 1 receives the PDCCH (Physical Downlink Control CHannel). The receiving processing unit of the terminal device 1 performs processing for receiving the PDCCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH. The receiving processing unit of the terminal device 1 performs processing for receiving the PDCCH and detecting the downlink control information.

[0043] The receiving unit of the terminal device 1 receives PDSCH (Physical Downlink Shared CHannel). The receiving unit of the terminal device 1 performs processing for receiving PDSCH in a downlink frequency band (cell, component carrier, carrier). The receiving unit of the terminal device 1 performs processing such as demodulation and decoding on PDSCH.

[0044] The receiving unit of the terminal device 1 receives the PSCCH (Physical Sidelink Control CHannel). The receiving processing unit of the terminal device 1 performs processes such as demodulation and decoding on the PSCCH. The receiving processing unit of the terminal device 1 performs processing of receiving the PSCCH and performs processing of detecting the sidelink control information. The receiving unit of the terminal device 1 determines the frequency resources (interlaced lines and resource blocks described later) constituting the PSCCH. The receiving unit of the terminal device 1 determines the OFDM symbol in which the PSCCH can be configured. The receiving unit of the terminal device 1 performs blind decoding on the PSCCH. The receiving unit of the terminal device 1 performs blind decoding on the PSCCH in one time slot in one resource pool. The receiving unit of the terminal device 1 can perform blind decoding on the PSCCH in two or more time slots in one resource pool. The receiving unit of the terminal device 1 can also perform blind decoding on two or more PSCCHs in one time slot in one resource pool. The receiving unit of the terminal device 1 receives the PSSCH (Physical Sidelink Shared CHannel). The receiving unit of the terminal device 1 performs processes such as demodulation and decoding on the PSSCH. The receiving unit of the terminal device 1 receives the PSFCH (Physical Sidelink Feedback CHannel). The receiving unit of the terminal device 1 receives the HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) in the PSFCH.

[0045] The transmission unit (also referred to as a transmission processing unit) of the terminal device 1 transmits HARQ-ACK. The transmission processing unit of the terminal device 1 transmits HARQ-ACK for PDSCH. The transmission processing unit of the terminal device 1 transmits HARQ-ACK in an uplink frequency band (cell, component carrier, carrier).

[0046] The transmission processing unit of the terminal device 1 sends HARQ-ACK for PSSCH. The transmission processing unit of the terminal device 1 sends HARQ-ACK in the sidelink frequency band. The transmission processing unit of the terminal device 1 sends HARQ-ACK in PSFCH. The transmission processing unit of the terminal device 1 may send HARQ-ACK in PSSCH. The transmission processing unit of the terminal device 1 may not send HARQ-ACK for PSSCH.

[0047] The transmission unit of the terminal device 1 transmits the PSCCH. The transmission processing unit of the terminal device 1 performs encoding, modulation and other processing on the PSCCH. The transmission processing unit of the terminal device 1 performs processing of sending side link control information using the PSCCH. The transmission unit of the terminal device 1 determines the frequency resources (interlaced lines and resource blocks described later) constituting the PSCCH. The transmission unit of the terminal device 1 determines the OFDM symbol in which the PSCCH can be configured. The transmission unit of the terminal device 1 transmits the PSSCH. The transmission processing unit of the terminal device 1 performs encoding, modulation and other processing on the PSSCH.

[0048] The upper layer processing unit 14 outputs uplink data (transmission block) generated by user operation or the like to the wireless transceiver unit 10. The upper layer processing unit 14 performs processing on the MAC (Medium Access Control) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Radio Resource Control (RRC) layer.

[0049] The higher layer processing unit 14 outputs the side link data (transmission block) to the wireless transmission and reception unit 10 .

[0050] The media access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs processing at the MAC layer.

[0051] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs RRC layer processing. The radio resource control layer processing unit 16 manages various setting information / parameters (RRC parameters) of this device. The radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on the upper layer signal received from the base station device 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on information representing various setting information / parameters (RRC parameters) received from the base station device 3. It should be noted that the setting information may include information associated with the processing or setting of the physical channel or physical signal (that is, the physical layer), the MAC layer, the PDCP layer, the RLC layer, and the RRC layer. The parameter may be an upper layer parameter.

[0052] For example, the radio resource control layer processing unit 16 may obtain RRC parameters included in an RRC message on a certain logical channel, and set the obtained RRC parameters in the 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 sets a control resource set based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets (configures) a search area in the control resource set. The radio resource control layer processing unit 16 sets (configures) the PDCCH candidates monitored in the control resource set. The radio resource control layer processing unit 16 sets (configures) the number of PDCCH candidates monitored in the control resource set. The radio resource control layer processing unit 16 sets (configures) the aggregation level of the PDCCH candidates monitored in the control resource set.

[0054] The radio resource control layer processing unit 16 sets the DCI (Downlink Control Information) format to be monitored in the control resource set. The radio resource control layer processing unit 16 can set the DCI format to be monitored in the search area. The radio resource control layer processing unit 16 sets the DCI format to be monitored in the control resource set based on the RRC signaling indicated by the base station device 3. The radio resource control layer processing unit 16 can set the DCI format to be monitored in the search area based on the RRC signaling indicated by the base station device 3. The radio resource control layer processing unit 16 sets one or more DCI formats to be monitored in the reception processing unit.

[0055] The radio resource control layer processing unit 16 performs settings related to a plurality of search areas and adds an index to each of the settings related to the plurality of search areas.

[0056] The radio resource control layer processing unit 16 performs settings related to CSI (Channel State Information) feedback (transmission of channel state information) based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets the transmission period of CSI feedback, the transmission start timing (offset) of CSI feedback, the type of information of CSI feedback, etc. The radio resource control layer processing unit 16 performs settings related to multiple CSI feedbacks. Indexes are respectively added to the settings related to multiple CSI feedbacks.

[0057] The radio resource control layer processing unit 16 performs settings related to SPS (Semi-Persistent Scheduling) based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets the period of SPS resources (PDSCH resources), the start timing (offset) of SPS resources (PDSCH resources), the number of HARQ (Hybrid Automatic Repeat reQuest) processes set for SPS, the offset for deriving the HARQ process ID used in SPS, the value of RNTI (Radio Network Temporary Identifier) ​​used for SPS scheduling, etc. The radio resource control layer processing unit 16 performs settings related to multiple SPSs. Indexes are respectively added to the settings related to multiple SPSs.

[0058] The radio resource control layer processing unit 16 performs carrier aggregation settings based on the RRC signaling received from the base station device 3. As a setting for carrier aggregation, the radio resource control layer processing unit 16 performs service cell settings (secondary cell, primary and secondary cell). The service cell may be composed of a downlink component carrier. The service cell may also be composed of 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 in the downlink component carrier set in the configuration of carrier aggregation. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing in the uplink component carrier set in the configuration of carrier aggregation.

[0059] The wireless resource control layer processing unit 16 performs settings related to the side link based on the RRC signaling received from the base station device 3. The wireless resource control layer processing unit 16 sets the 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 wireless resource control layer processing unit 16 sets the OFDM symbol in which the PSCCH can be configured. For example, the wireless resource control layer processing unit 16 sets the frequency band in which the PSCCH is configured. For example, the wireless resource control layer processing unit 16 sets the number of resource blocks or interlaced lines that constitute one PSCCH. The wireless resource control layer processing unit 16 performs settings related to the transmission and reception of the PSCCH on the wireless transceiver unit 10.

[0060] The media access control layer processing unit (MAC layer processing unit) 15 activates / deactivates the secondary cell based on the MAC CE (MAC Control Element) received from the base station device 3. The media access control layer processing unit (MAC layer processing unit) 15 outputs information indicating activation / deactivation of multiple service cells configured by the radio resource control layer processing unit 16 to the wireless transceiver unit 10 based on the MAC CE (SCell Activation / Deactivation MAC CEs) including the information on activation / deactivation of the secondary cell. The media access control layer processing unit (MAC layer processing unit) 15 deactivates the secondary cell based on the timer. The media access control layer processing unit (MAC layer processing unit) 15 determines that the base station device 3 does not schedule the service cell for a certain period of time by measuring with the timer, disables the service cell, and controls the wireless transceiver unit 10.

[0061] The media access control layer processing unit (MAC layer processing unit) 15 performs sidelink HARQ operation, sidelink scheduling request, sidelink buffer status report, and CSI report processing.

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

[0063] The wireless transceiver 10 performs modulation, coding, and transmission processing. The wireless transceiver 10 generates a physical signal by coding, modulating, and baseband signal generation (conversion into a time-continuous signal) for data (transmission block), and transmits the physical signal to the base station device 3 .

[0064] The wireless transceiver 10 performs demodulation processing, decoding processing, and reception processing. The wireless transceiver 10 outputs a transport block among information detected based on the demodulation processing and decoding processing of the received physical signal on the DL-SCH to the upper layer processing unit 14 .

[0065] The wireless transceiver unit 10 stops various receiving processes and various sending processes in the disabled service cell. For example, the wireless transceiver unit 10 stops monitoring the PDCCH in the disabled service cell. For example, the wireless transceiver unit 10 stops receiving the PDSCH in the disabled service cell. For example, the wireless transceiver unit 10 stops sending the SRS in the disabled service cell. For example, the wireless transceiver unit 10 stops sending the PUSCH (Physical Uplink Shared CHannel) in the disabled service cell.

[0066] The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal, removes unnecessary frequency components, and 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 removes a portion corresponding to a CP (Cyclic Prefix) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal after the CP is removed to extract 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 generated OFDM symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[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, upconverts the analog signal to a carrier frequency, and generates an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. In addition, the RF unit 12 amplifies the power. In addition, the RF unit 12 may also have a function of controlling the transmission power. The RF unit 12 is also called a transmission power control unit.

[0070] The wireless transceiver 10 performs carrier sense (LBT) before transmitting a signal in order to avoid collision with signals from other devices (apparatuses). The following types of LBT are used. Type 1: LBT with random backoff using variable-sized contention windows Type 2A: LBT with 25us carrier sense before sending a signal and no random backoff process Type 2B: LBT with 16us carrier sense before sending without random backoff process Type 2C: No LBT

[0071] The wireless transceiver 10 sends a signal after detecting that there is no transmission from other devices (idle state) during monitoring, and does not send a signal when it detects that there is transmission from other devices (busy state) during monitoring. The wireless transceiver 10 obtains a transmission opportunity and sends when the LBT result is idle, and does not send when the LBT result is busy. The time of the transmission opportunity is called Channel Occupancy Time (COT). In LBT, the terminal device 1 monitors the channel before sending data, evaluates the idle channel, and sends data when it is confirmed that the channel is in an idle state.

[0072] When the random backoff process is performed, the wireless transceiver 10 randomly generates a backoff counter value within the contention window size after the last transmission. In the random backoff, the terminal device 1 detects the channel energy at each time interval through the random backoff counter, thereby evaluating whether the channel is in an idle state. The wireless transceiver 10 stands by until it is confirmed that the channel is idle for a certain amount of time, and performs carrier sensing (sensing) at each sensing time slot. If the result of the carrier sensing is that the channel is idle, the wireless transceiver 10 reduces the backoff counter value. If the result of the carrier sensing is that the channel is busy, the wireless transceiver 10 maintains the backoff counter value and stands by until it is confirmed that the channel is idle for a certain amount of time, and then performs carrier sensing. As a result of repeating the above actions, after the backoff counter value becomes 0, the wireless transceiver 10 obtains access to the channel and can start sending signals on the channel.

[0073] When HARQ-ACK feedback is applied to the side link, the wireless transceiver 10 updates the contention window size based on the state of HARQ-ACK. When the state of HARQ-ACK is ACK (ACKnowledgement: positive acknowledgement), the wireless transceiver 10 sets the contention window size to the minimum value. When the state of HARQ-ACK is NACK (Negative-ACKnowledgment: negative acknowledgement), the wireless transceiver 10 sets the contention window size to the next larger value. When the maximum value that can be set for the contention window size is reached, the wireless transceiver 10 continues to use the maximum value even when the state of 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] Terminal device 1 performs listen before talk (LBT) on the channel before transmitting on the channel. Terminal device 1 can adjust the amount of time to perform LBT. Terminal device 1 can select a random number between zero and the contention window size. When the channel is idle for at least the amount of time associated with the random number, terminal device 1 can get a transmission opportunity and transmit.

[0076] Hereinafter, a configuration example of the base station device 3 according to one aspect of the present embodiment will be described.

[0077] Figure 4 1 is a schematic block diagram showing the configuration of a base station device 3 according to one embodiment of the present invention. As shown in the figure, the base station device 3 is configured to include a wireless transceiver unit 30 and an upper layer processing unit 34. The wireless transceiver unit 30 is configured to include an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The upper layer processing unit 34 is configured to include a media access control layer processing unit 35 and a wireless resource control layer processing unit 36. The wireless transceiver unit 30 is also referred to as a transmitting unit, a receiving unit, or a physical layer processing unit.

[0078] The upper layer processing unit 34 performs processing on the MAC (Medium Access Control) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Radio Resource Control (RRC) layer. Here, the MAC layer is also referred to as the MAC sublayer. In addition, the PDCP layer is also referred to as the PDCP sublayer. In addition, the RLC layer is also referred to as the RLC sublayer. In addition, the RRC layer is also referred to as the RRC sublayer.

[0079] The media access control layer processing unit 35 of the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing may include mapping of logical channels and transport channels, multiplexing of transport blocks of one or more MAC SDUs (Service Data Units), decomposing the transport blocks distributed by the physical layer on the UL-SCH into one or more MAC SDUs, applying HARQ (Hybrid Automatic Repeat reQuest) for the transport blocks, and part or all of the processing of scheduling requests.

[0080] The radio resource control layer processing unit 36 ​​of the upper layer processing unit 34 performs RRC layer processing. The RRC layer processing may include part or all of the management of broadcast signals, the management of RRC connection / RRC idle state, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates or obtains downlink data (transport block), system information, RRC message, MAC CE, etc. configured on PDSCH from the upper node, and outputs them to the wireless transceiver unit 30.

[0081] In addition, the wireless resource control layer processing unit 36 ​​manages various setting information / parameters (RRC parameters) of each terminal device 1. The wireless resource control layer processing unit 36 ​​can set various setting information / parameters for each terminal device 1 via upper layer signals. That is, the wireless resource control layer processing unit 36 ​​sends / broadcasts information representing various setting information / parameters. It should be noted that the setting information may include information associated with the processing or setting of the physical channel or physical signal (that is, the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. The parameter may be an upper layer parameter. For example, the wireless resource control layer processing unit 36 ​​may include the RRC parameters in an RRC message on a certain logical channel and pass them to the terminal device 1. Here, the RRC message can be mapped to any one of BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel) and DCCH (Dedicated Control CHannel).

[0082] The radio resource control layer processing unit 36 ​​may determine the RRC parameters delivered to the terminal device 1 based on the RRC parameters included in the RRC message delivered by the terminal device 1. Here, the RRC message delivered by the terminal device 1 may be associated with the function information report of the terminal device 1.

[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) in the set control resource set. The radio resource control layer processing unit 36 ​​sets a search area for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search area for the terminal device 1.

[0084] The radio resource control layer processing unit 36 ​​sets the DCI format applied to the terminal device 1 in the control resource set. The radio resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format applied to the terminal device 1. The radio resource control layer processing unit 36 ​​sets one or more DCI formats applied in the transmission processing unit.

[0085] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search areas and assigns an index to each of the settings related to the plurality of search areas.

[0086] The radio resource control layer processing unit 36 ​​sets the resources for sending HARQ-ACK for the terminal device 1. The radio resource control layer processing unit 36 ​​sets the resources for sending HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier). The radio resource control layer processing unit 36 ​​sets the resources for sending HARQ-ACK for PDSCH in the uplink frequency band (cell, component carrier, carrier).

[0087] The radio resource control layer processing unit 36 ​​performs settings related to CSI feedback (transmission of channel state information) for the terminal device 1. The radio resource control layer processing unit 36 ​​sets the transmission period of CSI feedback, the transmission start timing (offset) of CSI feedback, the type of information of CSI feedback, etc. The radio resource control layer processing unit 36 ​​performs settings related to multiple CSI feedbacks. Indexes are respectively added to the settings related to multiple CSI feedbacks.

[0088] The radio resource control layer processing unit 36 ​​performs settings related to the SPS on the terminal device 1. The radio resource control layer processing unit 36 ​​sets the period of the resources (PDSCH resources) of the SPS, the start timing (offset) of the resources (PDSCH resources) of the SPS, the number of HARQ processes set for the SPS, the offset for deriving the HARQ process ID used in the SPS, the value of the RNTI used for scheduling the SPS, etc. The radio resource control layer processing unit 36 ​​performs settings related to multiple SPSs. Indexes are added to the settings related to the multiple SPSs, respectively.

[0089] The wireless resource control layer processing unit 36 ​​performs carrier aggregation settings for the terminal device 1. As a setting for carrier aggregation, the wireless resource control layer processing unit 36 ​​performs service cell settings (secondary cell, primary and secondary cell). The service cell may be composed of a downlink component carrier. The service cell may also be composed of a downlink component carrier and an uplink component carrier. The wireless resource control layer processing unit 36 ​​controls the wireless transceiver unit 30 to perform transmission processing on the terminal device 1 using the downlink component carrier set in the carrier aggregation configuration. The wireless resource control layer processing unit 36 ​​controls the wireless transceiver unit 30 to perform reception processing on the terminal device 1 using the uplink component carrier set in the carrier aggregation configuration.

[0090] The radio resource control layer processing unit 36 ​​sets sidelink-related parameters for the terminal device 1. The radio resource control layer processing unit 36 ​​sets sidelink-related parameters for the terminal device 1 and notifies the terminal device 1 via the radio transceiver unit 30. As sidelink-related parameters, for example, the following information is used. · Composition of the side link BWP · Composition of sidelink radio bearer ·Sidelink measurement configuration

[0091] The information indicating the composition of the side link BWP includes information indicating the starting position of the symbol in the time slot used for the side link, the length of the symbol, the composition of the PSBCH (Physical Sidelink Broadcast CHannel), the composition of the resource pool of the side link, and the like. The information indicating the composition of the PSBCH includes information indicating the parameters for the transmission power control of the PSBCH. The information indicating the composition of the side link resource pool includes information indicating the composition of the reception resource pool of the side link, the composition of the transmission resource pool of the side link, and the like. As the composition of the transmission resource pool of the side link, it includes the composition of the transmission resource pool for the method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1 and the composition of the transmission resource pool for the method (mode 2) in which the terminal device 1 autonomously selects resources.

[0092] The information indicating the composition of the side link resource pool includes information indicating the composition of the PSCCH, information indicating the composition of the PSSCH, information indicating the composition of the PSFCH, information indicating the size of the subchannel of the side link, information indicating the starting position of the subchannel of the side link, information indicating the MCS (Modulation and Coding Scheme) table used in the side link, information indicating the composition of the side link PTRS (Phase Tracking Reference Signal), information indicating the composition of the side link TDD UL-DL (Time-Division-Duplex Uplink-Downlink), information indicating the number of PRBs of the side link resource pool, information indicating the time resources of the side link resource pool, information indicating the parameters of the transmission power control of the side link, information indicating the maximum number of reserved PSCCH / PSSCH resources that can be shown by one SCI, information indicating a set of reservable resource intervals, and information indicating whether the DM RS (Demodulation Reference Signal) of the PSCCH or PSSCH is used for the L1 RSRP (Reference Signal Received) in the sensing operation. Power: reference signal received power) measurement information, information indicating the start position of the sensing window, information indicating the end position of the sensing window, information indicating the configuration of the side link synchronization, etc.

[0093] In addition, the information indicating the composition of the side link resource pool may include information indicating the composition of the time slot. It may also include information indicating which of the following compositions is applied: a composition in which the time slot of the PSCCH can be configured only in the first half of the time slot (the second OFDM symbol, or the second and third OFDM symbols); a composition in which the time slot of the PSCCH can be configured in the first half of the time slot (the second OFDM symbol, or the second and third OFDM symbols) or the second half of the time slot (the ninth OFDM symbol, or the ninth and tenth OFDM symbols).

[0094] The PSSCH is configured in the OFDM symbol after the OFDM symbol configured with the PSCCH. For example, the PSSCH is configured in the second and subsequent OFDM symbols in the time slot. For example, when the PSCCH is configured in the first half of the time slot, the PSSCH is configured in the second and subsequent OFDM symbols in the time slot, and when the PSCCH is configured in the second half of the time slot, the PSSCH is configured in the ninth and subsequent OFDM symbols in the time slot.

[0095] The information indicating the composition of the PSCCH includes information indicating the number of symbols of 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 information indicating the number of bits reserved in the first stage SCI (first stage SCI).

[0096] The information representing the composition of the PSSCH includes information representing candidates for the β offset of the number of coded modulation symbols for determining the second stage SCI (2nd stage SCI), information representing the time domain pattern of the DM RS of the PSSCH, and information representing a proportional factor for limiting the number of resource elements of the second stage SCI allocated to the PSSCH.

[0097] The information indicating the composition of the PSFCH includes information indicating a set of PRBs used for transmission and reception of the PSFCH, information indicating the number of cyclic shift pairs that can be multiplexed in one PRB for PSFCH transmission, information indicating the number of PSFCH resources that can be used in the multiplexing of HARQ-ACK information, information indicating a scrambling ID used for sequence hopping of the PSFCH, information indicating an interval of PSFCH resources, and information indicating a minimum time gap between the PSSCH and the PSFCH.

[0098] The information indicating the parameters for the transmission power control of the side link includes information indicating the parameters used in the transmission power control based on the side link path loss and information indicating the parameters used in the transmission power control based on the downlink path loss.

[0099] The information indicating the configuration of the side link synchronization includes information indicating the synchronization configuration of the side link used for transmitting and receiving the side link synchronization signal when the terminal device 1 is synchronized with the GNSS (Global Navigation Satellite System) or the synchronization configuration of the side link used for transmitting and receiving the side link synchronization signal when the terminal device 1 is synchronized with the base station device 3, information indicating the type of hysteresis when evaluating the synchronization reference terminal device 1, information indicating the number of side link SSB transmissions within a side link SSB (Synchronization Signal Block) interval, information indicating the interval and starting position of the side link SSB, information indicating the ID of the side link synchronization signal, information indicating the threshold used in judging the transmission of the side link synchronization signal, and the like.

[0100] The information indicating the composition of the side link radio bearer includes information indicating whether the terminal device 1 becomes a synchronization source, information indicating parameters for detecting failure of the side link radio link, information indicating the frequency of using the side link, information indicating the composition of a method (mode 1) for the base station device 3 to indicate scheduling information to the terminal device 1, information indicating the composition of a method (mode 2) for the terminal device 1 to autonomously select resources, information indicating whether to use CSI reports, information indicating the composition of a scheduling request for the side link, information indicating the priority of transmitting and receiving side link SSBs, information indicating an RLC mode, information indicating the composition of a side link logical channel, information indicating the composition of a side link RLC, and the like.

[0101] The information indicating the frequency of using the side link also includes information indicating the subcarrier spacing, information indicating the frequency position of the side link SSB, information indicating the synchronization priority, and the like.

[0102] The information indicating the structure of the method (mode 1) for the base station device 3 to indicate scheduling information to the terminal device 1 includes information indicating the RNTI for the base station device 3 to scramble the CRC (Cyclic Redundancy Check) of the DCI format (DCI format) (for example, DCI format 3_0) including the scheduling information for the terminal device 1, information indicating the structure of the side link MAC, and information indicating the structure of the side link configuration grant. The information indicating the structure of the side link MAC includes information indicating the structure of the side link BSR (Buffer Status Report), and information indicating the threshold for determining the priority of the side link transmission and the uplink transmission. The information indicating the structure of the side link configuration grant includes information indicating the ID for identifying the configuration grant for the side link, information indicating the frequency resources of the side link configuration grant, information indicating the time resources of the side link configuration grant, information indicating the HARQ process ID of the side link configuration grant, information indicating the resources for HARQ-ACK transmission of the side link, information indicating the interval of the side link configuration grant, information indicating the resource pool to which the side link configuration grant is applied, information indicating the starting subchannel of the side link configuration grant, and the like.

[0103] The information representing the structure of the method (mode 2) for the terminal device 1 to autonomously perform resource selection includes information representing the transmission parameters of the PSSCH such as MCS, subchannel number, number of retransmissions, transmission power parameters, information representing the probability for resource selection, information representing the threshold value for RSRP for resource selection, etc.

[0104] The information indicating the composition of the sidelink logical channel includes information indicating the priority of the sidelink logical channel, information indicating the composition of the scheduling request that can be applied 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 resources mapped to the sidelink logical channel, information indicating the maximum physical channel interval of the resources mapped to the sidelink logical channel, information indicating the ID of the sidelink logical channel group, and the like.

[0105] The information indicating the composition of the side link measurement includes information indicating the frequency of performing the side link measurement, information indicating the filter coefficient applied to the side link measurement, information indicating the interval for reporting the results of the side link measurement, information indicating the threshold used in the judgment of reporting the results of the side link measurement, information indicating the interval used in the judgment of reporting the results of the side link measurement, etc.

[0106] The terminal device 1 notifies the base station device 3 of the information related to the side link through RRC signaling. The information includes information indicating the frequency of the terminal device 1's interest in receiving the side link communication, information indicating the frequency of the terminal device 1's interest in sending the side link communication, information indicating the parameters of the transmission resources of the request side link, information related to the side link capability, information indicating the playback type (broadcast, multicast, unicast) of the request side link resources, information indicating the destination identity, information related to the side link QoS (Quality of Service), information indicating the RLC mode, information indicating a list of synchronization references for the terminal device 1, and the like.

[0107] The media access control layer processing unit (MAC layer processing unit) 35 generates a MACCE (SCell Activation / Deactivation MAC CEs) indicating activation / deactivation of a secondary cell. The media access control layer processing unit (MAC layer processing unit) 35 generates a MACCE indicating activation / deactivation of a secondary cell for a plurality of service cells formed by the radio resource control layer processing unit 36. The media access control layer processing unit (MAC layer processing unit) 35 deactivates the secondary cell based on a timer. The media access control layer processing unit (MAC layer processing unit) 35 determines that the service cell is not scheduled for a certain period of time by measuring using a timer, disables the service cell, and controls the wireless transceiver unit 30.

[0108] Since the function of the wireless transceiver 30 is the same as that of the wireless transceiver 10, the description is appropriately omitted. The wireless transceiver 30 performs physical layer processing. Here, the physical layer processing may include the generation of a baseband signal of a physical channel, the generation of a baseband signal of a physical signal, and the detection of information transmitted through the physical channel, and the detection of information transmitted through the physical signal. In addition, the physical layer processing may also include mapping processing of the physical channel of the transmission channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0109] The wireless transceiver 30 may perform one or both of the demodulation process and the decoding process. The wireless transceiver 30 may distribute the transport block in the information detected based on the demodulation process and the decoding process for the received physical signal to the upper layer on the UL-SCH. For example, the wireless transceiver 30 may generate a baseband signal of a downlink physical channel. Here, the transport block distributed by the upper layer on the DL-SCH may be configured in the downlink physical channel. For example, the wireless transceiver 30 may generate a baseband signal of a downlink physical signal.

[0110] The wireless transceiver 30 may perform a part or all of the modulation process, the coding process, and the transmission process. The wireless transceiver 30 may generate a physical signal based on a part or all of the coding process, the modulation process, and the baseband signal generation process for the transport block. The wireless transceiver 30 may configure the physical signal to a certain BWP. The wireless transceiver 30 may transmit the generated physical signal. For example, the wireless transceiver 30 may attempt to detect the information transmitted through the uplink physical channel. Here, the transport block in the information transmitted through the uplink physical channel may be distributed to the upper layer on the UL-SCH. For example, the wireless transceiver 30 may attempt to detect the information transmitted through the uplink physical signal.

[0111] The wireless transceiver unit 30 grasps the SS (Search space) configured in the terminal device 1. The wireless transceiver unit 30 grasps the search area within the control resource set configured in the terminal device 1. The wireless transceiver unit 30 grasps the PDCCH candidates monitored in the terminal device 1 and grasps the search area. The wireless transceiver unit 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (grasps the number of control channel elements constituting the PDCCH candidates). The wireless transceiver unit 30 includes a SS grasping unit, which grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates within the control resource set constituting the search area of ​​the terminal device. The SS grasping unit grasps the PDCCH candidates constituted in the search area of ​​the control resource set of the terminal device 1 (the number of PDCCH candidates, the number of PDCCH candidates).

[0112] The SS grasping unit grasps the configuration of the search space in the control resource set (the number of PDCCH candidates, OFDM symbols of PDCCH candidates, and aggregation level of PDCCH candidates). The transmitting unit (transmission processing unit) of the wireless transceiver unit 30 transmits PDCCH to the terminal device 1 using the PDCCH candidates in the search space of the control resource set.

[0113] The transmission unit (also referred to as the transmission processing unit) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using the 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 the PDCCH candidates in the search area set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using the PDCCH candidates in the search area monitored for the PDCCH in the terminal device 1 in the multiple search areas set for the terminal device 1.

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

[0115] The receiving unit of the base station device 3 receives the sidelink HARQ-ACK from the terminal device 1. The terminal device 1 transmits the information of the sidelink HARQ-ACK acquired through the PSFCH received from the terminal device 1 of the communication partner in the sidelink to the base station device 3 using the PUCCH.

[0116] The wireless transceiver 30 stops various reception processes and various transmission processes in the disabled service cell. For example, the wireless transceiver 30 stops the transmission of PDCCH in the disabled service cell. For example, the wireless transceiver 30 stops the transmission of PDSCH in the disabled service cell. For example, the wireless transceiver 30 stops the reception of SRS in the disabled service cell. For example, the wireless transceiver 30 stops the reception of PUSCH in the disabled service cell.

[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 can digitize the baseband signal input from the RF unit 32. The baseband unit 33 can remove the portion corresponding to the CP (Cyclic Prefix) from the digitized baseband signal. The baseband unit 33 can perform a fast Fourier transform (FFT: Fast Fourier Transform) on the baseband signal after the CP is removed, and extract a signal in the frequency domain.

[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 simulate the baseband signal to which the CP is added. The baseband unit 33 may output the simulated baseband signal to the RF unit 32.

[0120] The RF unit 32 can remove unnecessary frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 can up-convert the baseband signal into a carrier frequency to generate an RF signal. The RF unit 32 can transmit the RF signal via the antenna unit 31. In addition, the RF unit 32 can also have a function of controlling transmission power.

[0121] Each of the components denoted by reference numerals 10 to 16 included in the terminal device 1 may be configured as a circuit. Each of the components denoted by reference numerals 30 to 36 included in the base station device 3 may be configured as a circuit.

[0122] The following describes the physical channels and physical signals (Physical signals) of various schemes of this embodiment.

[0123] Physical signal is the general term for downlink physical channel, downlink physical signal, uplink physical channel and uplink physical channel. Physical channel is the general term for downlink physical channel and uplink physical channel. Physical signal is the general term for downlink physical signal and uplink physical signal.

[0124] The uplink physical channel may correspond to a set of resource elements that carry information generated in an upper layer. The uplink physical channel is a physical channel used in an uplink component carrier. The uplink physical channel may be transmitted by the wireless transceiver 10. The uplink physical channel may be received by the wireless transceiver 30. In a wireless communication system of one embodiment of the present invention, 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] PUCCH can be used to transmit (transmit) uplink control information (UCI: Uplink Control Information). Uplink control information can be configured on PUCCH. The wireless transceiver unit 10 can transmit PUCCH configured with uplink control information. The wireless transceiver unit 30 can receive PUCCH configured with uplink control information.

[0126] The uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) includes part or all of the channel state information (CSI), scheduling request (SR), and HARQ-ACK (Hybrid Automatic Repeat request ACK nowledgement) information. It should be noted that the uplink control information may include information not described in the above content.

[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 consist of a HARQ-ACK bit corresponding to a transport block (TB). The HARQ-ACK bit may represent an ACK (acknowledgement) or a NACK (negative-acknowledgement) corresponding to the transport block. ACK may indicate that the decoding of the transport block has been successfully completed (has been decoded). NACK may indicate that the decoding of the transport block has not been successfully completed (has not been decoded). The HARQ-ACK information may include one or more HARQ-ACK bits.

[0129] The HARQ-ACK for the transport block is also referred to as the HARQ-ACK for the PDSCH. Here, the "HARQ-ACK for the PDSCH" may refer to the HARQ-ACK for the transport block included in the PDSCH.

[0130] The scheduling request can be used to request the resources of UL-SCH for initial transmission. The scheduling request bit can be used to indicate either a positive SR (positive SR) or a negative SR (negative SR). The scheduling request bit indicating a positive SR is also referred to as "sending (transmitting) a positive SR". The positive SR may indicate that the resources of UL-SCH for initial transmission are requested by the terminal device 1. The scheduling request bit indicating a negative SR is also referred to as "sending (transmitting) a negative SR". The negative SR may indicate that the resources of UL-SCH for initial transmission are not requested by the terminal device 1.

[0131] The channel state information may include part or all of a channel quality indicator (CQI: Channel Quality Indicator), a precoding matrix indicator (PMI: Precoder Matrix Indicator), and a rank indicator (RI: Rank Indicator). CQI is an indicator associated with the quality of a propagation path (e.g., propagation strength) or the quality of a physical channel, and PMI is an indicator associated with precoding. RI is an indicator associated with a transmission rank (or number of transmission layers).

[0132] The channel state information is an indicator related to the reception state of a physical signal (eg, 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. Channel measurement may include interference measurement.

[0133] PUCCH may be accompanied by a certain PUCCH format. Here, the PUCCH format may be a form of processing of the physical layer of the PUCCH. In addition, the PUCCH format may also be a form of information transmitted using the PUCCH.

[0134] PUSCH can be sent to transmit uplink control information and one or both of the transport blocks. PUSCH can be used to transmit uplink control information and one or both of the transport blocks. PUSCH can also be used to transmit at least a part or all of the transport blocks, HARQ-ACK, channel state information, and scheduling requests. PUSCH is used at least to transmit random access message 3. PUSCH can be used to transmit information not described in the above content. Terminal device 1 can transmit PUSCH configured with uplink control information and one or both of the transport blocks. Base station device 3 can receive PUSCH configured with uplink control information and one or both of the transport blocks.

[0135] The PRACH may be sent to convey the index of the random access preamble (random access message 1). The terminal device 1 may send the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may send the random access preamble on the PRACH. The base station device 3 may receive the random access preamble on the PRACH.

[0136] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal may not be used to transmit information generated in the upper layer. It should be noted that the uplink physical signal may also be used to transmit information generated in the physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The wireless transceiver unit 10 may send an uplink physical signal. The wireless transceiver unit 30 may receive an uplink physical signal. In the uplink of a wireless communication system of one embodiment of the present invention, 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 associated with PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) can be given based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for DMRS for PUSCH can be the same as the set of antenna ports for the PUSCH.

[0139] The propagation path of the PUSCH can be estimated based on the DMRS used for the PUSCH.

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

[0141] The propagation path of the PUCCH can be estimated based on the DMRS used for the PUCCH.

[0142] A downlink physical channel may correspond to a set of resource elements that transmit information generated in an upper layer. A downlink physical channel may be a physical channel used in a downlink component carrier. The wireless transceiver unit 30 may transmit a downlink physical channel. The wireless transceiver unit 10 may receive a downlink physical channel. In the downlink of a wireless communication system of one embodiment of the present invention, 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] PBCH is transmitted to transmit one or both of the master information block (MIB) and physical layer control information. Here, physical layer control information is information generated at the physical layer. MIB is an RRC message distributed by the upper layer on the BCCH (Broadcast Control CHannel).

[0144] The PDCCH is used to transmit (transmit) at least downlink control information (DCI: Downlink Control Information). The downlink control information can be configured on the PDCCH. The terminal device 1 can receive the PDCCH configured with the downlink control information. The base station device 3 can transmit the PDCCH configured with the downlink control information.

[0145] The downlink control information may be sent with a DCI format. It should be noted that the DCI format may be interpreted as a form of downlink control information. In addition, the DCI format may also be interpreted as a set of downlink control information set in a certain form of downlink control information.

[0146] The base station device 3 can use the PDCCH with the DCI format to notify the terminal device 1 of the downlink control information. Here, the terminal device 1 can monitor the PDCCH to obtain the downlink control information. It should be noted that, unless otherwise specified, the DCI format and the downlink control information are sometimes recorded as equivalent. For example, the base station device 3 can include the downlink control information in the DCI format and pass it to the terminal device 1. In addition, the terminal device 1 can use the downlink control information included in the detected DCI format to control the wireless transceiver unit 10.

[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 of the PDSCH is also called a downlink DCI format. The DCI format used for scheduling of the PUSCH is also called an uplink DCI format. The downlink grant is also called a downlink assignment (DL assignment) or a downlink allocation (DL allocation).

[0148] DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, etc. are DCI formats. The uplink DCI format is a generic term for DCI format 0_0 and DCI format 0_1, etc. The downlink DCI format is a generic term for DCI format 1_0 and DCI format 1_1, etc.

[0149] DCI format 0_0 is used to configure the scheduling of the PUSCH in a certain cell. DCI format 0_0 is configured to include at least a part 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 (MCS field: Modulation and Coding Scheme field)

[0150] The DCI format specific field may indicate whether the DCI format including the DCI format specific field is an uplink DCI format or a downlink DCI format. That is, the DCI format specific field may be included in each uplink DCI format and downlink DCI format. Here, the DCI format specific field included in DCI format 00 may indicate 0.

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

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

[0154] The MCS field included in the DCI format 0_0 may be used to indicate one or both of the modulation scheme for the PUSCH scheduled by the DCI format 0_0 and the target coding rate scheduled by the DCI format 0_1. The target coding rate may be a target coding rate for a transport block configured in the PUSCH. The size of the transport block (TBS: Transport Block Size) configured in the PUSCH may be determined based on a portion or all of the target coding rate and the modulation scheme for the PUSCH.

[0155] DCI format 0_0 may not include a field for CSI request (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 to configure the scheduling of the PUSCH in a certain cell. DCI format 0_1 ​​is configured to include a part or all of the 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: downlink assignment index)

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

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

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

[0160] The MCS field included in the DCI format 0_1 ​​may be used to indicate one or both of a modulation scheme for a PUSCH scheduled by the DCI format 0_1 ​​and a target coding rate for the PUSCH scheduled by the DCI format 0_1.

[0161] The CSI request field may be used to indicate a report of CSI.

[0162] The BWP field of DCI format 0_1 ​​can be used to indicate the uplink BWP configured with the PUSCH scheduled by the DCI format 0_1. That is, DCI format 0_1 ​​may or may not be accompanied by a change in the activated uplink BWP. The terminal device 1 can identify the uplink BWP configured with the PUSCH based on the detection of the DCI format 0_1 ​​for scheduling the PUSCH.

[0163] In the case where the carrier indicator field is included in the DCI format 0_1, the carrier indicator field may also be used to indicate the serving cell of the uplink component carrier configured with the PUSCH. The terminal device 1 may recognize, based on detecting the DCI format 0_1 ​​in the downlink component carrier of a certain serving cell, that the PUSCH scheduled by the DCI format 0_1 ​​is configured in the uplink component carrier of the serving cell indicated by the carrier indicator field included in the DCI format 0_1.

[0164] In the case where the carrier indicator field is not included in DCI format 0_1, the service cell to which the uplink component carrier configured with the PUSCH scheduled by DCI format 0_1 ​​belongs may be the same as the service cell to which the downlink component carrier including the PDCCH including the DCI format 0_1 ​​is configured. The terminal device 1 may recognize that the PUSCH scheduled by the DCI format 0_1 ​​is configured in the uplink component carrier of a certain service cell based on the detection of DCI format 0_1 ​​in a certain downlink component carrier of the certain service cell.

[0165] The UL DAI field is used at least to indicate the transmission status of the PDSCH. When a dynamic HARQ-ACK codebook is used, the size of the UL DAI field can be 2 bits. The UL DAI field indicates the size of the HARQ-ACK codebook sent via PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook sent via PUSCH. The UL DAI field indicates the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook sent via PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases including the corresponding HARQ-ACK in the HARQ-ACK codebook sent via PUSCH.

[0166] The UL DAI field may represent a value to which a modulo operation is applied. An example in which the UL DAI field is 2 bits is described. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 0, "00" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 1, "01" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 2, "10" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 3, "11" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 4, "00" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 5, "01" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 6, "10" is shown as the UL DAI field. In the HARQ-ACK codebook transmitted through the PUSCH, when the number of PDSCHs including the corresponding HARQ-ACK is 7, "11" is shown as the UL DAI field. In this example, in the HARQ-ACK codebook transmitted through the PUSCH, a modulo operation using the value '4' is performed on the number of PDSCHs including the corresponding HARQ-ACK.

[0167] The terminal device 1 interprets the UL DAI field in consideration of the total number of PDSCHs received. For example, the terminal device 1 receives 4 PDSCHs and receives a UL DAI field showing "00". In this case, the terminal device 1 interprets that the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook sent via PUSCH represented by the UL DAI field is 4. For example, the terminal device 1 receives 3 PDSCHs and receives a UL DAI field showing "00". In this case, the terminal device 1 interprets that the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook sent via PUSCH represented by the UL DAI field is 4, and determines that the reception of 1 PDSCH has failed.

[0168] DCI format 1_0 is used for scheduling of a PDSCH configured in a certain cell. DCI format 1_0 is configured to include a part 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 (PDSCH to HARQ feedback timing indicator field) 3F)PUCCH resource indicator field

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

[0170] The frequency domain resource allocation field included in DCI format 1_0 may be used to indicate allocation of frequency resources for a PDSCH scheduled by the DCI format.

[0171] The time domain resource allocation field included in DCI format 1_0 may be used to indicate allocation of time resources for a PDSCH scheduled by the DCI format.

[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 may be a target coding rate for a transport block configured in the PDSCH. The size of the transport block configured in the PDSCH (TBS: Transport Block Size) may be determined based on the target coding rate and one or both of the modulation scheme for the PDSCH.

[0173] The PDSCH_HARQ feedback timing indication field may be used to indicate an offset from a time slot including an OFDM symbol at the end of the PDSCH to a time slot including an OFDM symbol at the start of the PUCCH. The timing indication field from the PDSCH to the HARQ feedback may be a field indicating timing K1. In the case where the index of the time slot including the OFDM symbol at the end of the PDSCH is time slot n, the index of the time slot including the PUCCH or PUSCH may be n+K1, and the PUCCH or PUSCH may include at least a HARQ-ACK corresponding to a transport block included in the PDSCH. In the case where the index of the time slot including the OFDM symbol at the end of the PDSCH is time slot n, the index of the time slot including the OFDM symbol at the start of the PUCCH or the OFDM symbol at the start of the PUSCH may be n+K1, and the OFDM symbol at the start of the PUCCH or the OFDM symbol at the start of the PUSCH may include at least a HARQ-ACK corresponding to a transport block included in the PDSCH.

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

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

[0176] DCI format 1_1 is used for scheduling of a PDSCH configured in a certain cell. DCI format 1_1 is configured to include a part 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) Carrier Indicator Field

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

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

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

[0180] The MCS field included in the DCI format 1_1 may be used to indicate one or both of a modulation scheme for the PDSCH scheduled by the DCI format 1_1 and a target coding rate for the PDSCH scheduled by the DCI format 1_1.

[0181] In the case where the PDSCH_HARQ feedback timing indication field is included in the DCI format 1_1, the PDSCH_HARQ feedback timing indication field may be used to indicate an offset from a time slot of an OFDM symbol including the end of the PDSCH to a time slot of an OFDM symbol including the start of the PUCCH. In the case where the PDSCH_HARQ feedback timing indication field is not included in the DCI format 1_1, a parameter indicating an offset from a time slot of an OFDM symbol including the end of the PDSCH to a time slot of an OFDM symbol including the start of the PUCCH may be provided by the RRC layer.

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

[0183] The BWP field of DCI format 1_1 can be used to indicate the downlink BWP configured with the PDSCH scheduled by the DCI format 1_1. That is, DCI format 1_1 may or may not be accompanied by a change in the activated downlink BWP. The terminal device 1 can identify the downlink BWP configured with the PDSCH based on the detection of the DCI format 1_1 for PDSCH scheduling.

[0184] The DCI format 1_1 not including the BWP field may be a DCI format for scheduling PDSCH without a change in activating the downlink BWP. The terminal device 1 may recognize that the PDSCH is received without switching the activated downlink BWP based on detecting the DCI format 1_1 for PDSCH scheduling and the DCI format 1_1 not including the BWP field.

[0185] In the case where the carrier indicator field is included in the DCI format 1_1, the carrier indicator field may be used to indicate the serving cell configured with the downlink component carrier of the PDSCH scheduled by the DCI format 1_1. The terminal device 1 may recognize, based on detecting the DCI format 1_1 in the downlink component carrier of a certain serving cell, that the PDSCH scheduled by the DCI format 1_1 is configured in the downlink component carrier of the serving cell indicated by the carrier indicator field included in the DCI format 1_1.

[0186] When the carrier indicator field is not included in DCI format 1_1, the downlink component carrier configured with the PDSCH scheduled by DCI format 1_1 may be the same as the downlink component carrier configured with the PDCCH including the DCI format 1_1. The terminal device 1 may recognize that the PDSCH scheduled by the DCI format 1_1 is configured in a downlink component carrier based on detecting the DCI format 1_1 in the downlink component carrier.

[0187] A downlink grant is used to schedule at least one PDSCH in one serving cell. A downlink grant is used to schedule at least one PDSCH in the same timeslot as the timeslot in which the downlink grant is sent. A downlink grant may also be used to schedule a PDSCH in a timeslot different from the timeslot in which the downlink grant is sent. An uplink grant is used to schedule at least one PUSCH in one serving cell.

[0188] It should be noted that various DCI formats may also include fields different from the above fields. It may also include a field indicating the cumulative number of PDCCHs sent (C-DAI: Counter Downlink Assignment Index field). It may also include a field indicating the total number of PDCCHs sent (T-DAI: Total Downlink Assignment Index field).

[0189] The PDSCH may be sent to deliver a transport block. The PDSCH may be used to deliver a transport block. The transport block may be configured on the PDSCH. The base station device 3 may send the PDSCH configured with the transport block. The terminal device 1 may receive the PDSCH configured with the transport block.

[0190] A downlink physical signal may correspond to a set of resource elements. A downlink physical signal may not be used to transmit information generated in an upper layer. It should be noted that a downlink physical signal may also be used to transmit information generated in a physical layer. A downlink physical signal may be a physical signal used in a downlink component carrier. The wireless transceiver unit 10 may receive a downlink physical signal. The wireless transceiver unit 30 may send a downlink physical signal. In the downlink of a wireless communication system of one embodiment of the present invention, at least a part 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 for the terminal device 1 to achieve synchronization in the frequency domain and / or time domain of the downlink. The synchronization signal is a general term for PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0192] The SS block (SS / PBCH block) is configured to include at least a part or all of the PSS, SSS, and PBCH.

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

[0194] A PBCH conveying a symbol of a PBCH in a certain antenna port may be estimated based on a DMRS for the PBCH that is configured to a slot in which the PBCH is mapped and that is included in a SS / PBCH block including the PBCH.

[0195] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0196] The set of antenna ports for DMRS for PDSCH (DMRS associated with PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) can be given based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for DMRS for PDSCH can be the same as the set of antenna ports for the PDSCH.

[0197] The propagation path of the PDSCH can be estimated based on the DMRS used for the PDSCH. If a set of resource elements that convey symbols of a certain PDSCH and a set of resource elements that convey symbols of the DMRS used for the certain PDSCH are included in the same precoding resource group (PRG: Precoding Resource Group), the PDSCH that conveys symbols of the PDSCH in a certain antenna port can be estimated based on the DMRS used for the PDSCH.

[0198] The antenna port for the DMRS of the PDCCH (DMRS associated with 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 the PDCCH can be estimated based on the DMRS used for the PDCCH. If the same precoding is applied (assumed to be applied, assumed to be applied) in a set of resource elements that convey symbols of a certain PDCCH and a set of resource elements that convey symbols of the DMRS used for the certain PDCCH, the PDCCH conveying symbols of the PDCCH in a certain antenna port can be estimated based on the DMRS used for the PDCCH.

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

[0201] The BCH of the transport layer can be mapped to the PBCH of the physical layer. That is, the transport block distributed by the upper layer on the BCH of the transport layer can be configured on the PBCH of the physical layer. In addition, the UL-SCH of the transport layer can also be mapped to the PUSCH of the physical layer.

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

[0203] BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel) and DCCH (Dedicated Control CHannel) are logical channels. For example, BCCH can be used to distribute RRC messages including MIB or RRC messages including system information. In addition, CCCH can be used to send RRC messages including RRC parameters that are common to multiple terminal devices 1. Here, CCCH can be used for terminal devices 1 that are not RRC connected, for example. In addition, DCCH can be used to send RRC messages dedicated to a certain terminal device 1. Here, DCCH can be used for terminal devices 1 that are RRC connected, for example.

[0204] BCCH can be mapped to BCH or DL-SCH. That is, RRC messages including information of MIB can be distributed to BCH. In addition, RRC messages including system information other than MIB can be distributed to DL-SCH. In addition, CCCH is mapped to DL-SCH or UL-SCH. That is, RRC messages mapped to CCCH can be distributed to DL-SCH or UL-SCH. In addition, DCCH can also be mapped to DL-SCH or UL-SCH. That is, RRC messages mapped to DCCH can be distributed to DL-SCH or UL-SCH.

[0205] UL-SCH can be mapped to PUSCH. DL-SCH can be mapped to PDSCH. BCH can be mapped to PBCH.

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

[0207] For example, the downlink control information including the downlink grant or the uplink grant includes a C-RNTI (Cell-Radio Network Temporary Identifier), and is sent and received through the PDCCH.

[0208] A physical channel can be mapped to a serving cell. A physical channel can also be mapped to a BWP set to a carrier included in a serving cell.

[0209] One or more control resource sets (CORESET: Control ResourceSET) can be set in the terminal device 1. The terminal device 1 monitors (monitor) PDCCH in one or more control resource sets. Here, monitoring PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to one or more control resource sets, respectively. It should be noted that the PDCCH may include one or more PDCCH candidates and / or a set of PDCCH candidates. In addition, monitoring PDCCH may include monitoring and detecting PDCCH and / or a DCI format sent via 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 (CCE: Control Channel Element) 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 from the viewpoint of a search space. That is, the set of PDCCH candidates monitored by the terminal device 1 is given based on the search space.

[0212] The search area may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of a PDCCH candidate may indicate the number of CCEs constituting the PDCCH. A PDDCH candidate 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. An index (search area index) may be assigned to each search area.

[0214] The search area sets may be associated with at least one control resource set respectively. The search area sets may also be included in one control resource set respectively. The search area sets may be given an index of a control resource set associated with the search area set respectively.

[0215] The terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by performing blind detection on PDCCH candidates included in the search area within the control resource set.

[0216] In various aspects of this embodiment, unless otherwise specified, the number of resource blocks means the number of resource blocks in the frequency domain.

[0217] The terminal device 1 sends uplink control information (UCI) to the base station device 3. The terminal device 1 can multiplex the UCI with the PUCCH for transmission. The terminal device 1 can also multiplex the UCI with the PUSCH for transmission. The UCI may include at least one of the channel state information (Channel State Information: CSI) of the downlink, the scheduling request (Scheduling Request: SR) indicating the request for PUSCH resources, and the HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) for the downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU (Media Access Control Protocol Data Unit), Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0218] HARQ-ACK may also be referred to as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

[0219] In the case of successful decoding of data, an ACK for the data is generated. In the case of unsuccessful decoding of data, a NACK for the data is generated. The HARQ-ACK may include at least a HARQ-ACK bit corresponding to at least one transport block. The HARQ-ACK bit may represent an ACK (ACK nowledgement) or a NACK (Negative-ACK nowledgement) corresponding to one or more transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook (HARQ-ACK codebook), which includes one or more HARQ-ACK bits. The correspondence between the HARQ-ACK bit and one or more transport blocks may be that the HARQ-ACK bit corresponds to the PDSCH including the one or more transport blocks.

[0220] The HARQ control for one transport block may be referred to as a HARQ process. A HARQ process identifier may be given for each HARQ process. The DCI format includes a field indicating a HARQ process identifier (HARQ process number).

[0221] NDI (New Data Indicator) is indicated by the DCI format for each HARQ process. For example, the DCI format (DL assignment) including the scheduling information of the PDSCH includes an NDI field. The NDI field is 1 bit. The terminal device 1 stores (stores) the value of NDI for each HARQ process. The base station device 3 stores (stores) the value of NDI for each HARQ process for each terminal device 1. The terminal device 1 uses the detected NDI field of the DCI format to update the stored NDI value. The base station device 3 sets the updated NDI value or the unupdated NDI value to the NDI field of the DCI format and sends it to the terminal device 1. The terminal device 1 uses the detected NDI field of the DCI format to update the stored NDI value for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

[0222] The terminal device 1 determines whether the received transport block is a new transmission or a retransmission based on the value of the NDI field of the DCI format (DL assignment). The transport block of a certain HARQ process is compared with the value of the previously received NDI. If the value of the NDI field of the detected DCI format is flipped, the terminal device 1 determines that the received transport block is a new transmission. In the case of sending a newly transmitted transport block in a certain HARQ process, the base station device 3 flips the value of the stored NDI for the HARQ process and sends the flipped NDI to the terminal device 1. In the case of sending a retransmitted transport block in a certain HARQ process, the base station device 3 does not flip the value of the stored NDI for the HARQ process and sends the unflipped NDI to the terminal device 1. The transport block of a certain HARQ process is compared with the value of the previously received NDI. If the value of the NDI field of the detected DCI format is not flipped (if the same), the terminal device 1 determines that the received transport block is a retransmission. It should be noted that, here, flipping means switching to a different value.

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

[0224] For DCI format 1_0, the value of the HARQ indication field can 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 can be mapped to a set of slot numbers given by the upper layer parameter dl-DataToUL-ACK. The number of slots indicated at least based on the value of the HARQ indication field can also be referred to as HARQ-ACK timing or K1. For example, a HARQ-ACK indicating the decoding status of a PDSCH (downlink data) sent in slot n can be reported (sent) in slot n+K1.

[0225] dl-DataToUL-ACK represents a list of timings of HARQ-ACK for PDSCH. Timing refers to the number of time slots between the time slot in which PDSCH is received (or the time slot including the OFDM symbol mapping the end of PDSCH) and the time slot in which HARQ-ACK for the received PDSCH is sent. For example, dl-DataToUL-ACK is a list of 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 timings. In the case where Dl-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bits. In the case where Dl-DataToUL-ACK is a list of 2 timings, the HARQ indication field is 1 bit. In the case where Dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indication field is 2 bits. In the case where Dl-DataToUL-ACK is a list of 5 or 6 or 7 or 8 timings, the HARQ indication field is 3 bits. For example, dl-DataToUL-ACK is composed of a list of timings of any value in the range of 0 to 31. For example, dl-DataToUL-ACK is composed of a list of timings of any value in the range of 0 to 63.

[0226] The size of dl-DataToUL-ACK is defined as the number of elements that dl-DataToUL-ACK includes. The size of dl-DataToUL-ACK may also be referred to as L para The index of dl-DataToUL-ACK indicates the order (number) of the elements of dl-DataToUL-ACK. For example, when the size of dl-DataToUL-ACK is 8 (L para =8), the index of dl-DataToUL-ACK is any value of 1, 2, 3, 4, 5, 6, 7 or 8. The index of dl-DataToUL-ACK may be given or represented or indicated by the value represented by the HARQ indication field.

[0227] Terminal device 1 can set the size of the HARQ-ACK codebook according to the size of dl-DataToUL-ACK. For example, when dl-DataToUL-ACK is composed of 8 elements, the size of the HARQ-ACK codebook is 8. For example, when dl-DataToUL-ACK is composed of 2 elements, the size of the HARQ-ACK codebook is 2. Each HARQ-ACK information constituting the HARQ-ACK codebook is the HARQ-ACK information received for the PDSCH of each time slot timing of dl-DataToUL-ACK. This type of HARQ-ACK codebook is also called Semi-static HARQ-ACK codebook.

[0228] Terminal device 1 may use PUCCH transmission and / or PUSCH transmission in time slot n+k to report HARQ-ACK information for PDSCH reception in time slot n. Here, k may be the number of time slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception. In addition, in the case where the HARQ indication field is not included in the DCI format, k may be given by the upper layer parameter dl-DataToUL-ACK.

[0229] The terminal device 1 determines a set of multiple opportunities for receiving more than one candidate PDSCH by sending the corresponding HARQ-ACK information through the PUCCH of a certain time slot. The terminal device 1 determines the multiple time slots of the time slot timing K1 included in the dl-DataToUL-ACK as multiple opportunities for receiving the candidate PDSCH. K1 can be a set of k. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), in the PUCCH of time slot n, HARQ-ACK information for PDSCH reception of time slot n-1, PDSCH reception of time slot n-2, PDSCH reception of time slot n-3, PDSCH reception of time slot n-4, PDSCH reception of time slot n-5, PDSCH reception of time slot n-6, PDSCH reception of time slot n-7, and PDSCH reception of time slot n-8 are sent. When the terminal device 1 actually receives PDSCH in the time slot corresponding to the candidate PDSCH reception, it sets ACK or NACK as HARQ-ACK reporting based on the transport block included in the PDSCH. When the terminal device 1 does not receive PDSCH in the time slot corresponding to the candidate PDSCH reception, it sets NACK as HARQ-ACK information.

[0230] The HARQ-ACK codebook may be given based on at least a set of monitoring occasions for PDCCH, a portion or all of the value of the counted DAI field. 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 HARQ-ACK codebook may be given based on the value of the total DAI field.

[0231] The size of the HARQ-ACK codebook can be set based on the value of the count DAI field of the last received DCI format. The count DAI field indicates the cumulative number of PDSCHs or transport blocks scheduled until the corresponding DCI format is received. The size of the HARQ-ACK codebook can be set based on the value of the total DAI field of the DCI format. The total DAI field indicates the total number of PDSCHs or transport blocks scheduled until the HARQ-ACK codebook is sent.

[0232] The terminal device 1 can determine a set of monitoring opportunities for PDCCH for HARQ-ACK information sent in the PUCCH configured in the time slot of index n (slot#n) based at least on a part or all of the value of the timing K1 and the value of the time slot offset K0. The set of monitoring opportunities for PDCCH for HARQ-ACK information sent in the PUCCH configured in the time slot of index n is also referred to as a set of monitoring opportunities for PDCCH for time slot n (monitoring occasion for PDCCH for slot#n). Here, the set of monitoring opportunities for the PDCCH includes M monitoring opportunities for PDCCH. For example, the time slot offset K0 can be represented based on at least the value of the time domain resource allocation field included in the downlink DCI format. The time slot offset K0 is a value representing the number of time slots (time slot difference) from the time slot including the end of the OFDM symbol configured with the PDCCH including the DCI format to the start point of the OFDM symbol of the PDSCH scheduled by the DCI format, and the DCI format includes a time domain resource allocation field representing the time slot offset K0.

[0233] It may be that, when a DCI format detected in a monitoring opportunity of any search area set corresponding to a monitoring opportunity of a certain PDCCH triggers the sending of HARQ-ACK information (including information for triggering) in time slot n, the terminal device 1 determines the monitoring opportunity of the PDCCH as the PDCCH monitoring opportunity for time slot n. In addition, it may be that, when a DCI format detected in a monitoring opportunity of a search area set corresponding to a monitoring opportunity of a certain PDCCH does not trigger the sending of HARQ-ACK information (excluding information for triggering) in time slot n, the terminal device 1 does not determine the monitoring opportunity of the PDCCH as the PDCCH monitoring opportunity for time slot n. In addition, it may be that, when a DCI format is not detected in the monitoring opportunity of a search area set corresponding to a monitoring opportunity of a certain PDCCH, the terminal device 1 does not determine the monitoring opportunity of the PDCCH as the PDCCH monitoring opportunity for time slot n.

[0234] The counter DAI indicates the cumulative number of PDCCHs detected among the monitoring opportunities of M PDCCHs, for a monitoring opportunity of a PDCCH in a certain service cell, until the monitoring opportunity of the PDCCH in the service cell (or it may be a value at least associated with the cumulative number). The counter DAI may be referred to as C-DAI. The C-DAI corresponding to the PDSCH may be represented by a field included in the DCI format used for scheduling the PDSCH. The total DAI may indicate the cumulative number of PDCCHs detected among the monitoring opportunities of M PDCCHs, until the monitoring opportunity m of the PDCCH (or it may be a value at least associated with the cumulative number). The total DAI may be referred to as T-DAI (Total Downlink Assignment Index).

[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. Physical signal is also a general term for sidelink physical signal.

[0236] The sidelink physical channel may correspond to a set of resource elements that carry information generated in an upper layer. The sidelink physical channel is a physical channel used in the sidelink. The sidelink physical channel may be sent by the wireless transceiver 10. The sidelink physical channel may be received by the wireless transceiver 10. In a wireless communication system of one embodiment 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] PSBCH is sent to convey DFN (Direct Frame Number), TDD UL-DL configuration, time slot index (time slot index of the time slot configured with PSBCH), and coverage indicator (an identifier indicating whether the transmitting terminal device 1 is within the coverage of the base station device 3).

[0238] The PSCCH is used to transmit (transmit) at least sidelink control information (SCI: Sidelink Control Information). The sidelink control information can be configured on the PSCCH. The terminal device 1 can receive the PSCCH configured with the sidelink control information. The terminal device 1 can transmit the PSCCH configured with the sidelink control information.

[0239] The sidelink control information is sent and received in the form of the sidelink control information format (SCI format). The SCI sent and received via the PSCCH is called the first stage SCI (1 st The SCI sent and received via PSSCH is called the second stage SCI (2 nd stage SCI). SCI format (SCI format) 1-A may be included in the first stage SCI format. SCI format 1-A is used for scheduling of PSSCH and second stage SCI. SCI format 1-A includes 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 mode, a field indicating the second stage SCI format (SCI format 2-A, SCI format 2-B), a field indicating β offset (a parameter used to determine the amount of resources for the second stage SCI), a field indicating the number of DM RS ports, a field indicating MCS, a field indicating an MCS table, and a field including a PSFCH overhead indication.

[0240] The second stage SCI is used for decoding of PSSCH. SCI format 2-A includes HARQ process number, NDI, RV (Redundancy version), source ID, destination ID, HARQ feedback enable / disable indicator, play type indicator (unicast, broadcast, multicast), and CSI request information. SCI format 2-B includes HARQ process number, NDI, RV, source ID, destination ID, HARQ feedback enable / disable indicator, zone ID, and communication range request information.

[0241] The PSSCH may be sent to transmit sidelink data (sidelink transport block, sidelink PDU) and the second stage SCI. The PSSCH may be used to transmit sidelink data and the second stage SCI. The terminal device 1 may send the PSSCH configured with the sidelink data and the second stage SCI. The terminal device 1 may receive the PSSCH configured with the sidelink data and the second stage SCI.

[0242] The PSFCH may be used to transmit HARQ-ACK information corresponding to the PSSCH reception. The terminal device 1 may send the PSFCH configured with the HARQ-ACK information. The terminal device 1 may receive the PSFCH configured with the HARQ-ACK information.

[0243] The sidelink physical signal may correspond to a set of resource elements. The sidelink physical signal may not be used to transmit information generated in an upper layer. The sidelink physical signal may be used to transmit information generated in a physical layer. The wireless transceiver 10 may send the sidelink physical signal. The wireless transceiver 10 may receive the sidelink physical signal. In the sidelink of a wireless communication system of one embodiment of the present embodiment, at least a part or all of the following sidelink physical signals may be used. Sidelink Synchronization Signal (S-SS) Sidelink DM RS Sidelink CSI-RS Sidelink PT-RS

[0244] The sidelink synchronization signal is used for the terminal device 1 to synchronize the frequency domain and / or time domain of the sidelink. The sidelink synchronization signal is a general term for S-PSS (Sidelink Primary Synchronization Signal) and S-SSS (Sidelink Secondary Synchronization Signal).

[0245] The sidelink DM RS is a general term for the DM RS for PSBCH, the DM RS for PSCCH, and the DM RS for PSSCH. The time domain pattern of the DM RS for PSSCH is selected by the transmitting terminal device 1. The time domain pattern of the selection candidate is configured for each resource pool.

[0246] The sidelink CSI-RS is a reference signal used for channel measurement of the sidelink. The sidelink CSI-RS consists of the time resource allocation (configured symbol position) for the CSI-RS, the frequency resource allocation, the number of antenna ports, and the number of layers. The terminal device 1 uses MAC CE to report the channel state information measured based on the sidelink CSI-RS.

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

[0248] A signal for AGC (Access Gain Control) may also be used. The signal for AGC may be arranged in the first OFDM symbol of a slot (first slot or second slot).

[0249] The terminal device 1 can use the uplink PUCCH to report the sidelink HARA-ACK information received from the transmitting terminal device 1 to the base station device 3. A semi-static HARQ-ACK codebook (Semi-static HARQ-ACK codebook) or a dynamic HARQ-ACK codebook (Dynamic HARQ-ACK codebook) can be used.

[0250] The base station device 3 can notify the terminal device 1 of the scheduling information of the side link using the DCI format. DCI format 3_0 is used for scheduling of PSCCH and PSSCH. DCI format 3_0 is configured to include part or all of the following information. Resource pool index Time interval HARQ process number NDI Subchannel allocation information SCI format 1_A field Feedback of the timing indicator of the HARQ-ACK of the PSSCH corresponding to the PSFCH reception PUCCH resource indicator Configuration index Sidelink allocation index counter

[0251] The resource pool index indicates the resource pool used for the scheduled PSCCH and PSSCH. The time interval indicates the time from the receipt of DCI format 3_0 to the side link transmission. The subchannel allocation information indicates the subchannel used for the scheduled PSCCH and PSSCH. The SCI format 1_A field includes information on the frequency resource allocation and time resource allocation of SCI format 1_A sent by the terminal device 1 via the PSCCH. The timing indicator for feedback of the HARQ-ACK of the PSSCH corresponding to the PSFCH reception indicates the timing of the HARQ-ACK information obtained by the terminal device 1 receiving the PSFCH from the other party's terminal device 1 using the PUCCH to feedback. The PUCCH resource indicator indicates the resources of the PUCCH used to feedback the HARQ-ACK information obtained by receiving the PSFCH. The configuration index indicates the configuration of the side link configuration authorization. The side link allocation index counter indicates the number of side link allocations allocated to the terminal device 1 by the base station device 3 within a certain interval.

[0252] In order to utilize the unlicensed spectrum, the prescribed constraints need to be met. For example, according to the regulations of the European Telecommunications Standards Institute (ETSI), regarding the utilization of 5 GHz, which is one of the unlicensed spectrum, the occupied channel bandwidth (OCB) including 99% of the power of the signal must be a bandwidth of more than 80% of the available bandwidth (e.g., system bandwidth, bandwidth of LBT sub-band, bandwidth of sub-band). In addition, constraints related to the maximum transmit power density (Power Spectral Density (PSD)) per prescribed bandwidth (1 MHz) are specified.

[0253] In order to satisfy such constraints (e.g., OCB rules), a set of multiple frequency domain resources (also called interlace, RB set, etc.) using a specified interval is transmitted through the unlicensed carrier (interlace type transmission). An interlace can be defined as a set of multiple frequency domain resources allocated at a specified frequency interval (e.g., 10RB interval).

[0254] Figure 5 : is a diagram showing an example of interlaced mapping of a scheme of the present embodiment. Here, the case where the total available bandwidth is 20 MHz and 100 RBs is described. Interlaced #i is composed of 10 RBs with index values ​​{i, i+10, i+20, ..., i+90}. One interlaced line is composed of a plurality of RBs with a frequency interval of 10 RBs. When the total available bandwidth is 20 MHz, 10 interlaced lines #0-#9 are set.

[0255] exist Figure 5 In the description, the case where the subcarrier spacing is 15kHz is described, but when the subcarrier spacing is 30kHz, the frequency spacing of the resource blocks constituting the interlaced row can also be different. The 20MHz bandwidth is composed of 50 RBs, and one interlaced row is composed of 10 RBs. In this case, the five interlaced rows set are #0-#4. In this case, interlaced row #i is composed of 10 RBs with index values ​​{i, i+5, i+10, ..., i+45}. One interlaced row is composed of multiple RBs with a frequency spacing of 5 RBs.

[0256] A subchannel may be composed of more than one interlaced row. The subchannel index and the interlaced row index may be associated with each other in ascending order.

[0257] Figure 6 This is a diagram showing the configuration of the PSCCH monitored in the terminal device 1 of one aspect of the present embodiment. One slot is composed of 14 OFDM symbols (#0, #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12, #13). Figure 6 (a) shows the case of monitoring PSCCH in the second OFDM symbol (#1). PSCCH is monitored in a specific subchannel (for example, a subchannel with the smallest subchannel index) of the second OFDM symbol. If the terminal device 1 is able to detect the PSCCH, it receives the PSSCH in other subchannels of the second OFDM symbol, and receives the PSSCH and DM RS in the third and subsequent OFDM symbols. Figure 6 (b) shows the case of monitoring PSCCH in the second and third OFDM symbols (#1, #2). PSCCH is monitored in a specific subchannel (e.g., a subchannel with the smallest subchannel index) in the second and third OFDM symbols. If terminal device 1 is able to detect PSCCH, it receives PSSCH in other subchannels in the second and third OFDM symbols. PSSCH and DM RS are received in the fourth and subsequent OFDM symbols. It should be noted that in Figure 6 In (b), it is intended to monitor one PSCCH in the second and third OFDM symbols, but it is not intended to monitor two PSCCHs.

[0258] Figure 7 This is a diagram showing an example of the configuration of the PSCCH monitored in the terminal device 1 of one scheme of the present embodiment. One time slot is composed of 14 OFDM symbols (#0, #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12, #13). Figure 7(a) shows the case where PSCCH is monitored in at most the second OFDM symbol (#1) and the ninth OFDM symbol (#8). PSCCH is monitored in a specific subchannel of the second OFDM symbol (for example, a subchannel with the smallest subchannel index). If the terminal device 1 is able to detect PSCCH in the second OFDM symbol, it receives PSSCH in other subchannels of the second OFDM symbol, receives PSSCH and DM RS in the third and subsequent OFDM symbols, and does not monitor PSCCH in the ninth OFDM symbol. If the terminal device 1 cannot detect PSCCH in the second OFDM symbol, it monitors PSCCH in a specific subchannel of the ninth OFDM symbol. If the terminal device 1 is able to detect PSCCH in the ninth OFDM symbol, it receives PSSCH in other subchannels of the ninth OFDM symbol, and receives PSSCH and DM RS in the tenth and subsequent OFDM symbols.

[0259] Figure 7 (b) shows the case where PSCCH is monitored in at most the second and third OFDM symbols (#1, #2) and the ninth and tenth OFDM symbols (#8, #9). PSCCH is monitored in a specific subchannel (for example, a subchannel with the smallest subchannel index) of the second and third OFDM symbols. If the terminal device 1 is able to detect PSCCH in the second and third OFDM symbols, it receives PSSCH in other subchannels of the second and third OFDM symbols, receives PSSCH and DM RS in the fourth and subsequent OFDM symbols, and does not monitor PSCCH in the ninth and tenth OFDM symbols. If the terminal device 1 is unable to detect PSCCH in the second and third OFDM symbols, it monitors PSCCH in a specific subchannel of the ninth and tenth OFDM symbols. If the terminal device 1 can detect the PSCCH in the ninth and tenth OFDM symbols, it will receive the PSSCH in other subchannels of the ninth and tenth OFDM symbols, and receive the PSSCH and DM RS in the eleventh and subsequent OFDM symbols. Figure 7 In (b), it is intended to monitor one PSCCH in the second and third OFDM symbols, but not to monitor two PSCCHs. Figure 7 In (b), it is intended to monitor one PSCCH in the ninth and tenth OFDM symbols, but it is not intended to monitor two PSCCHs.

[0260] Before sending a signal (channel access), the terminal device 1 performs channel sensing (carrier sensing) to confirm whether there is any transmission from other devices (for example, base station devices, terminal devices, WiFi terminal devices, WiFi access points, etc.). After the last signal transmission, the terminal device 1 randomly generates a backoff counter value within the contention window size (CWS). The terminal device 1 waits until it is confirmed that the channel (LBT subband, RB set. For example, a frequency band with a bandwidth of 20MHz) is idle, and performs carrier sensing at each sensing time slot. If the channel is idle, the terminal device 1 reduces the counter value randomly determined within the contention window size (CWS) in sequence, obtains access to the channel after the counter value becomes 0, and transmits the signal. After the signal transmission is completed, the terminal device 1 that communicates using HARQ-ACK feedback updates the contention window size based on the HARQ-ACK feedback received from the terminal device 1 of the other party to which the signal is sent. When the state of HARQ-ACK is ACK, the terminal device 1 sets the contention window size to the minimum value. When the state of HARQ-ACK is NACK, the terminal device 1 sets the contention window size to the next largest value. When the maximum value that can be set for the contention window size is reached, the terminal device 1 continues to use the maximum value even when the state of HARQ-ACK is NACK.

[0261] When the LBT result is idle, the terminal device 1 obtains a transmission opportunity (TransmissionOpportunity: TxOP, channel occupancy (Channel Occupancy)) and transmits. When the LBT result is busy (LBT-busy), it does not transmit. The time of the transmission opportunity is called the Channel Occupancy Time (COT, channel occupancy time). COT is the total time length of all transmissions within the transmission opportunity and the intervals within the specified time, which can be less than the maximum COT (Maximum COT (MCOT)). MCOT can be determined based on the channel access priority class. The channel access priority class can be associated with the contention window size.

[0262] Define and use channel access priorities. For example, four channel access priorities (channel access priority 1, channel access priority 2, channel access priority 3, channel access priority 4) are defined and used. In channel access priority 1, the minimum contention window size is 3 time slots, the maximum contention window size is 7 time slots, and the allowed contention window sizes are {3 time slots, 7 time slots}. In channel access priority 2, the minimum contention window size is 7 time slots, the maximum contention window size is 15 time slots, and the allowed contention window sizes are {7 time slots, 15 time slots}. In channel access priority 3, the minimum contention window size is 15 time slots, the maximum contention window size is 1023 time slots, and the allowed contention window sizes are {15 time slots, 31 time slots, 63 time slots, 127 time slots, 255 time slots, 511 time slots, 1023 time slots}. In channel access priority 4, the minimum contention window size is 15 time slots, the maximum contention window size is 1023 time slots, and the allowed contention window sizes are {15 time slots, 31 time slots, 63 time slots, 127 time slots, 255 time slots, 511 time slots, 1023 time slots}. It should be noted that the contention window size can represent the number of counts per time slot.

[0263] If the terminal device 1 determines that the channel is busy in the carrier sense of the sensing time slot, it senses whether the channel is idle in the delay interval. The delay interval is composed of 16us and multiple sensing time slots. The number of sensing time slots that constitute the delay interval depends on the channel access priority. In the channel access priority 1, about two sensing time slots are constituted in the delay interval. In the channel access priority 2, about two sensing time slots are constituted in the delay interval. In the channel access priority 3, about three sensing time slots are constituted in the delay interval. In the channel access priority 4, about seven sensing time slots are constituted in the delay interval. If the terminal device 1 determines that the channel is busy in the delay interval, it determines whether the channel is idle again in the new delay interval. If the terminal device 1 determines that the channel is idle in the delay interval, it reduces the counter value set based on the contention window size, continues to perform carrier sense at each sensing time slot, and determines whether the channel is idle.

[0264] Applying the contention window size to the sensing of the channel may include using the contention window size to generate a backoff counter for the sensing of the channel.

[0265] The application of HARQ-ACK feedback enablement by the terminal device 1 in the side link transmission may include the terminal device 1 being instructed by the terminal device 1 of the other party to transmit HARQ-ACK feedback. The application of HARQ-ACK feedback disablement by the terminal device 1 in the side link transmission may include the terminal device 1 not being instructed by the terminal device 1 of the other party to transmit HARQ-ACK feedback. The setting of HARQ-ACK feedback enablement / disablement may be set to any one of SCI format 2-A / 2-B, sl-PSFCH-Period, and sl-HARQFeedbackEnabled.

[0266] SCI format 2-A / 2-B includes fields such as a 1-bit HARQ feedback enable / disable indicator. When the value of this field is set to 1, the terminal device 1 can apply HARQ-ACK feedback enable. When the value of this field is set to 0, the terminal device 1 can apply HARQ-ACK feedback disable. The setting information of a certain resource pool may include sl-PSFCH-Period. sl-PSFCH-Period can represent the period of PSFCH resources in time slots within the resource pool, and one is set from the values ​​of sl0, sl1, sl2, and sl4. When sl0 is set, the transmission of the resource pool of the terminal device 1 can all apply HARQ-ACK feedback disable. When sl1, sl2, and sl4 are set, the terminal device 1 can apply HARQ-ACK feedback enable. sl-HARQ-FeedbackEnabled is a field indicating whether HARQ feedback is enabled or disabled in the logical channel of the side link of the base station device 3. The parameters of sl-HARQ-FeedbackEnabled are enabled / disabled. When enabled is set in sl-HARQ-FeedbackEnabled, HARQ-ACK feedback enable can be applied in the logical channel of the side link. When disabled is set, HARQ-ACK feedback disable can be applied in the logical channel of the side link.

[0267] Figure 8 1 is a diagram showing an example of a side link transmission transmitted in a terminal device 1 according to one embodiment of the present invention. The terminal device 1 may be Figure 1 The terminal device 2 may be any one of the terminal devices 1A to 1D that perform side link communication with the terminal device 1. Figure 1Any one of the terminal devices 1A to 1D. 801 may be a transmission from the terminal device 1 to the terminal device 2 with HARQ-ACK feedback enabled. 802 may be HARQ-ACK feedback for the side link transmission of 801. 803 may be a side link transmission from the terminal device 1 to the terminal device 2 following 801. The terminal device 1 may determine the contention window size before the side link transmissions of 801 and 803. The terminal device 1 may apply the determined contention window size to the sensing of the channel, and perform the side link transmission when the sensing of the channel is successful.

[0268] The terminal device 1 may determine the contention window size for channel sensing before performing a first side link transmission. The terminal device 1 may determine the contention window size based on the HARQ-ACK feedback of the second side link transmission enabled by the HARQ-ACK feedback performed before the first side link transmission. When an ACK is received from the terminal device 1 of the transmitting party, the terminal device 1 may set the minimum contention window size. When a NACK is received from the terminal device 1 of the transmitting party, the terminal device 1 may set the contention window size to the next larger value. The terminal device 1 may set the contention window size to the next larger value when performing a transmission including retransmission without obtaining the result of HARQ-ACk feedback. The terminal device 1 may maintain the contention window size when performing a transmission not including retransmission without obtaining the result of HARQ-ACk feedback. As an example, in Figure 8 In the case of side link transmission of 801, the terminal device 1 can update the contention window size based on the result of 802 before the side link transmission of 803. When 802 is ACK, the terminal device 1 can set the contention window size to the minimum value before the side link transmission of 803. When 802 is NACK, the terminal device 1 can set the contention window size to the next larger value before the side link transmission of 803. When the terminal device 1 performs transmission including retransmission without obtaining 802, the terminal device 1 can set the contention window size to the next larger value before the side link transmission of 803. When the terminal device 1 performs transmission without retransmission without obtaining 802, the terminal device 1 can maintain the contention window size before the side link transmission of 803.

[0269] The terminal device 1 may determine the contention window size for channel sensing before performing the first side link transmission. The terminal device 1 may determine the contention window size based on the first number of second side link transmissions to which HARQ-ACK feedback disabling is applied. The first number may be the number of second side link transmissions to which HARQ-ACK feedback disabling is applied before performing the first side link transmission. The terminal device 1 may also be set to a second number as a threshold for determining the contention window size. The second number may be one or more times. The terminal device 1 may determine the contention window size based on whether the first number is less than the second number. In the case where the first number is less than the second number, the contention window size may be maintained. In the case where the first number is not less than the second number, the terminal device may update the contention window size. The terminal device 1 may apply the maintained or updated contention window size to channel sensing, and transmit when the channel sensing is successful.

[0270] Fig. 9 is a diagram showing an example of a side link transmission transmitted in a terminal device 1 according to one aspect of the present embodiment. The terminal device 1 may include Figure 1 The terminal device 2 may be any one of the terminal devices 1A to 1D that perform side link communication with the terminal device 1. Figure 1 Any one of the terminal devices 1A to 1D. 901 may be a side link transmission from terminal device 1 to terminal device 2 with HARQ-ACK feedback disabled. 902 may be a side link transmission from terminal device 1 to terminal device 2 with HARQ-ACK feedback disabled, which is performed subsequent to 901. 903 may be a side link transmission from terminal device 1 to terminal device 2 with HARQ-ACK feedback disabled, which is performed subsequent to 902. 904 may be a side link transmission from terminal device 1 to terminal device 2, which is performed subsequent to 903. Terminal device 1 may determine a contention window size before side link transmissions of 901 to 904. Terminal device 1 may apply the determined contention window size to channel sensing, and perform side link transmission when channel sensing is successful.

[0271] As an example, suppose that Fig. 9In the example, the terminal device 1 sets the second number to 3. The terminal device 1 can perform the side link transmission of 901. At this time, the first number is 1. Since the first number is less than the second number, the terminal device 1 can maintain the contention window size used for sensing the channel before the side link transmission of 902 to the contention window size set in 901. The terminal device 1 can perform the side link transmission of 902. At this time, the first number is 2. Since the first number is less than the second number, the terminal device 1 can maintain the contention window size used for sensing the channel before the side link transmission of 903 to the contention window size set in 902. The terminal device 1 can perform the side link transmission of 903. At this time, the first number is 3. Since the first number is not less than the second number, the terminal device 1 can update the contention window size set in 903 to the contention window size used for sensing the channel before the side link transmission of 904. The terminal device 1 can apply the updated contention window size to the sensing of the channel. When the sensing of the channel is successful, the terminal device 1 can perform the side link transmission of 904.

[0272] Fig.10 1 is a diagram showing an example of setting the contention window size of a terminal device of one scheme of the present embodiment. The terminal device 1 that has started the side link transmission can determine the contention window size of the initial value and apply the determined contention window size to the sensing of the channel (step 1001). When the sensing of the channel is successful, the terminal device 1 can perform the side link transmission (step 1002). The terminal device 1 can determine whether the counter n indicating the number of side link transmissions with HARQ-ACK feedback disabled is less than the second number (step 1003). The terminal device 1 can maintain the contention window size and increase the counter n by 1 (step 1004) when it is determined that the counter n is less than the second number (step 1003: yes (YES)). The terminal device 1 can update the contention window size and reset the counter n (step 1005) when it is determined that the counter n is not less than the second number (step 1003: no (NO)). For the next side link transmission, the process can be repeated again from step 1001. It should be noted that in step 1003, it can also be determined whether the counter n-1 is less than the second number.

[0273] The terminal device 1 may set a counter n for counting the first number. The terminal device 1 may set an initial value of the counter n to 0. When performing side link transmission to which HARQ-ACK feedback disabling is applied, the terminal device 1 may increase the counter n. When performing an update of the contention window size, the terminal device 1 may reset the counter n. As an example, in Fig.10In , when the terminal device 1 performs a side link transmission with HARQ-ACK feedback disabled, a determination is made in 1003. When the counter n is less than the second number, the terminal device 1 enters step 1004, maintains the contention window size, and increases the counter n by 1. When the terminal device 1 performs a side link transmission with HARQ-ACK feedback disabled, if the counter n is not less than the second number in the determination of 1003, the terminal device 1 may enter step 1005, update the contention window size, and reset the counter n. With respect to the terminal device 1, when the playback type of the side link transmission is a broadcast transmission, the terminal device 1 may be regarded as a side link transmission with HARQ-ACK feedback disabled. That is, the side link transmission with HARQ-ACK feedback disabled applied by the terminal device 1 may be a side link transmission with a playback type of a broadcast transmission.

[0274] When performing side link transmission to which HARQ-ACK feedback enable is applied, the terminal device 1 may reset the counter n to an initial value of 0. In addition, when performing side link transmission to which HARQ-ACK feedback enable is applied, the terminal device 1 may maintain the count n.

[0275] The terminal device 1 may set a counter n for each channel access priority. The terminal device 1 may set a common counter n for all channel access priorities. The terminal device 1 may reset the counter n when performing side link transmissions with different channel access priorities. In addition, the terminal device 1 may maintain the counter n when performing side link transmissions with different channel access priorities. As an example, the terminal device 1 may respectively assign independent counters n to channel access priority 1, channel access priority 2, channel access priority 3, and channel access priority 4 while setting a counter n for each channel access priority. The terminal device 1 may assign a common counter n to channel access priority 1, channel access priority 2, channel access priority 3, and channel access priority 4 while setting a common counter n for all channel access priorities.

[0276] The terminal device 1 may set the contention window size to the next large value when updating the contention window size. In addition, the terminal device 1 may set the contention window size to the previous small value when updating the contention window size. In addition, the terminal device 1 may set the contention window size to the minimum contention window size when updating the contention window size. In addition, the terminal device 1 may set the contention window size to the maximum contention window size when updating the contention window size. In addition, the terminal device 1 may randomly set the contention window size when updating the contention window size. The terminal device 1 may set the minimum contention window size when updating from the maximum contention window size to the next large value. The terminal device 1 may set the maximum contention window size when updating from the minimum contention window size to the previous small value. The terminal device 1 may set the contention window size to the next large value to update the contention window size, and when the maximum contention window size is reached, it is set to the minimum contention window size. The terminal device 1 may set the contention window size to the next small value to update the contention window size, and when the minimum contention window size is reached, it is set to the maximum contention window size. As an example, assume that the terminal device 1 updates from the contention window size of 127 time slots with the channel access priority 4. In the channel access priority 4, the allowed contention window sizes are seven {15 time slots, 31 time slots, 63 time slots, 127 time slots, 255 time slots, 511 time slots, 1023 time slots}. The terminal device 1 can set 255 time slots when the contention window size is set to the next larger value. The terminal device 1 can set 63 time slots when the contention window size is set to the previous smaller value. The terminal device 1 can set 15 time slots when the contention window size is set to the minimum contention window size. The terminal device 1 can set 1023 time slots when the contention window size is set to the maximum contention window size. The terminal device 1 can randomly set the contention window size from 15 time slots, 31 time slots, 63 time slots, 255 time slots, 511 time slots, and 1023 time slots except 127 time slots when randomly setting the contention window size. The terminal device 1 can set the maximum contention window size, that is, 1023 time slots, when the minimum contention window size of 15 time slots is set to the previous small value. The terminal device 1 can set the minimum contention window size, that is, 15 time slots, when the maximum contention window size of 1023 time slots is set to the next large value.

[0277] The second number can be set for each resource pool. Information indicating the second number for each resource pool can be notified to the terminal device 1 through RRC signaling. In addition, the second number can be set for each channel access priority. Information indicating the second number for each channel access priority can be notified to the terminal device 1 through RRC signaling. In addition, the second number can be set for each terminal device. Information indicating the second number can be notified to the terminal device 1 through RRC signaling.

[0278] The terminal device 1 may determine the contention window size for channel sensing before performing the first side link transmission. The terminal device 1 may randomly set the contention window size for the first side link transmission when HARQ-ACK feedback disable is applied to the second side link transmission performed before the first side link transmission. The terminal device 1 may apply the randomly set contention window size to the channel sensing, and when the channel sensing is successful, perform the first side link transmission. The terminal device 1 may not include the contention window size applied in the sensing of the channel for the second side link transmission, but randomly set the contention window size applied in the sensing of the channel for the first side link transmission. The terminal device 1 may include the contention window size applied in the sensing of the channel for the second side link transmission, and randomly set the contention window size applied in the sensing of the channel for the first side link transmission. The terminal device 1 may apply the randomly set contention window size to the channel sensing, and when the channel sensing is successful, perform the first side link transmission. As an example, it is assumed that the terminal device 1 applies the contention window size 127 time slots to the channel sensing with a channel access priority of 4, and performs the second side link transmission. The terminal device 1 may randomly set the contention window size applied in the sensing of the channel for the second side link transmission from 15 time slots, 31 time slots, 63 time slots, 255 time slots, 511 time slots, and 1023 time slots other than 127 time slots, while making the contention window size applied in the sensing of the channel for the first side link transmission not included in the contention window size for the sensing of the channel for the first side link transmission. The terminal device 1 may randomly set the contention window size applied in the sensing of the channel for the second side link transmission from 15 time slots, 31 time slots, 63 time slots, 127 time slots, 255 time slots, 511 time slots, and 1023 time slots, while making the contention window size applied in the sensing of the channel for the second side link transmission not included in the contention window size for the sensing of the channel for the first side link transmission. The terminal device 1 may apply the randomly set contention window size to the sensing of the channel, and when the sensing of the channel is successful, perform the first side link transmission.

[0279] The terminal device 1 may determine the contention window size for channel sensing before performing the first side link transmission. The terminal device 1 may determine the contention window size based on the third number in which the contention window size is maintained. The terminal device 1 may maintain the contention window size applied to the channel sensing before the second side link transmission when HARQ-ACK feedback disabling is applied in the second side link transmission performed before the first side link transmission, and apply it to the channel sensing before the first side link transmission. The terminal device 1 may also be set to a second number as a threshold for determining the contention window size. The second number may be one or more times. The terminal device 1 may determine the contention window size based on whether the third number is less than the second number. In the case where the third number is less than the second number, the contention window size may be maintained. In the case where the third number is not less than the second number, the terminal device may update the contention window size. The terminal device 1 may apply the maintained or updated contention window size to the channel sensing, and transmit when the channel sensing is successful.

[0280] As described above, for side link transmission in which HARQ-ACK feedback is disabled, it is possible to alleviate unfairness in channel access and perform communication between terminal devices.

[0281] The program operating in the base station device 3 and the terminal device 1 of one embodiment of the present invention may be a program (a program that causes a computer to function) that controls a CPU (Central Processing Unit) or the like to realize the functions of the above-mentioned embodiment of one embodiment of the present invention. In addition, the information processed by these devices is temporarily stored in a RAM (Random Access Memory) when processing, and then stored in various ROMs such as a Flash ROM (Read Only Memory) and a HDD (Hard Disk Drive), and is read, modified, and written by the CPU as needed.

[0282] It should be noted that a part of the terminal device 1 and the base station device 3 of the above embodiment may also be implemented by a computer. In this case, a program for implementing the control function may be recorded in a computer readable recording medium, and the program recorded in the recording medium may be read into a computer system and executed.

[0283] It should be noted that the "computer system" mentioned here refers to a computer system built into the terminal device 1 or the base station device 3, and includes hardware such as OS (Operating System), external devices, etc. In addition, "computer-readable recording medium" refers to removable media such as floppy disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into the computer system.

[0284] Furthermore, "computer-readable recording media" may include: media that dynamically store programs for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line; and media that store programs for a fixed period of time, such as a volatile memory inside a computer system that serves as a server or client in this case. In addition, the above-mentioned program may be a program for realizing a part of the functions, or a program that can realize the functions by combining with a program already recorded in a computer system.

[0285] The terminal device 1 may be composed of at least one processor and at least one memory including computer program instructions (computer program). The memory and computer program instructions (computer program) may be a configuration that uses the processor to cause the terminal device 1 to perform the actions and processes described in the above-mentioned embodiments. The base station device 3 may be composed of at least one processor and at least one memory including computer program instructions (computer program). The memory and computer program instructions (computer program) may be a configuration that uses the processor to cause the base station device 3 to perform the actions and processes described in the above-mentioned embodiments.

[0286] In addition, the base station device 3 in the above-mentioned embodiment can also be implemented as an aggregate (device group) composed of multiple devices. Each device constituting the device group can have a part or all of the functions or functional blocks of the base station device 3 involved in the above-mentioned embodiment. As a device group, it is sufficient to have all the functions or functional blocks of the base station device 3. In addition, the terminal device 1 in the above-mentioned embodiment can also communicate with the base station device as an aggregate.

[0287] In addition, the base station device 3 of the above-mentioned embodiment may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or NG-RAN (NextGenRAN, NR RAN: Next Generation Radio Access Network). In addition, the base station device 3 of the above-mentioned embodiment may also have part or all of the functions of the upper node for eNodeB and / or gNB.

[0288] In addition, part or all of the terminal device 1 and the base station device 3 of the above-mentioned embodiment may be implemented as LSI (Large Scale Integration) which is typically an integrated circuit, or may be implemented as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually chip-based, or may be partially or entirely integrated and chip-based. In addition, the method of integrated circuitization is not limited to LSI, and may also be implemented using a dedicated circuit or a general-purpose processor. In addition, in the case where a technology for integrated circuitization that replaces LSI emerges with the advancement of semiconductor technology, an integrated circuit based on the technology may also be used.

[0289] In addition, in the above-mentioned embodiment, a terminal device is recorded as an example of a communication device, but the present invention is not limited to this, and can also be applied to fixed or non-movable electronic devices installed indoors and outdoors, such as AV (Audio Video) equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines and other life equipment and other terminal devices or communication devices.

[0290] The embodiments of the present invention are described in detail with reference to the accompanying drawings, but the specific configuration is not limited to the present embodiment, and also includes design changes within the scope of the gist of the present invention. In addition, a scheme of the present invention can be variously changed within the scope shown in the technical scheme, and the embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, it also includes a configuration obtained by replacing the elements that have the same effect as the elements recorded in the above-mentioned embodiments with each other. Industrial Applicability

[0291] One aspect of the present invention can be used for example in a communication system, a communication device (for example, a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (for example, a communication chip), a program, or the like. Description of Reference Numerals 1(1A, 1B, 1C): Terminal device 3 (3A, 3B, 3C): Base station device 10, 30: Wireless transceiver 11, 31: Antenna 12, 32: RF department 13, 33: Baseband 14, 34: Upper processing unit 15, 35: Media access control layer processing unit 16, 36: Radio resource control layer processing unit

Claims

1. A terminal device, wherein: The present invention comprises: a transmitting unit, wherein the transmitting unit maintains the contention window size applied last time to sense the channel for side link transmission in which HARQ-ACK feedback is disabled, and the terminal device sets the contention window size to the next large value when the number of times the contention window size has been maintained reaches a specified number.

2. A communication method, which is a communication method of a terminal device, wherein: include: For side link transmissions where HARQ-ACK feedback is disabled, the contention window size applied last time is maintained for channel sensing, and when the number of times the contention window size has been maintained reaches a specified number, the contention window size is set to the next larger value.

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