Terminal device and communication method

Abstract

To make it possible to perform communication between terminal devices while achieving fair channel access.SOLUTION: A terminal device includes a transmitting unit that determines a contention window size, applies the contention window size to channel sensing, and performs a first sidelink transmission. The transmitting unit determines the contention window size based on a first number of second sidelink transmissions in which HARQ-ACK feedback is disabled.SELECTED DRAWING: Figure 10

Description

[Technical Field]

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

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

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

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

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

[0006] In unlicensed bands, LBT (Listen Before Talk) based on CCA (Clear Channel Assessment) is used to ensure coexistence with other systems. In Japan, Europe, etc., LBT functionality is required for systems operating in the unlicensed 5 GHz band. One aspect of the present invention provides a terminal device capable of realizing fair channel access in an environment where devices of a plurality of systems (terminal devices, base station devices, access points, etc.) may coexist, and a communication method used in the terminal device. [Means for solving the problem]

[0007] (1) A first aspect of the present invention is a terminal device comprising a transmitter that determines a contention window size, applies the contention window size to channel sensing, and performs a first sidelink transmission, wherein the transmitter determines the contention window size based on a first number of second sidelink transmissions in which HARQ-ACK feedback is disabled.

[0008] (2) A second aspect 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 sidelink transmission, and determines the contention window size based on a first number of second sidelink transmissions in which HARQ-ACK feedback is disabled. [Effects of the Invention]

[0009] According to the present invention, communication between terminal devices can be performed while achieving fair channel access. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. [Figure 3] 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 4] FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to one aspect of the present embodiment. [Figure 5] FIG. 10 is a diagram illustrating an example of interlace mapping according to one aspect of the present embodiment. [Figure 6] FIG. 10 is a diagram showing an example of an arrangement of PSCCHs monitored in a terminal device 1 according to an aspect of the present embodiment. [Figure 7] FIG. 10 is a diagram showing an example of an arrangement of PSCCHs monitored in a terminal device 1 according to an aspect of the present embodiment. [Figure 8] FIG. 10 is a diagram illustrating an example of side link transmission transmitted in a terminal device 1 according to an aspect of the present embodiment. [Figure 9] FIG. 10 is a diagram illustrating an example of side link transmission transmitted in a terminal device 1 according to an aspect of the present embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of contention window size settings for a terminal device according to an aspect of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

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

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

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

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

[0016] Serving cell groups (cell groups) are MCG, SCG, and PUCCH cell groups. A serving cell group may include one or more serving cells (or component carriers). The one or more serving cells (or component carriers) included in a serving cell group may be operated by carrier aggregation.

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

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

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

[0020] CP-OFDM may be used for the side link between the terminal devices 1. The sidelink between the terminal device 1 and the terminal device 1 may use DFT-s-OFDM.

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

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

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

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

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

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

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

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

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

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

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

[0032] A resource block (RB) contains NRBsc consecutive subcarriers. Resource blocks are divided into common resource blocks, physical resource blocks (PRBs), and virtual resource blocks (VRBs). For example, NRBsc=12.

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

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

[0035] Carrier aggregation is the process of providing multiple aggregated serving The carrier aggregation may be performed by using a cell. The carrier aggregation may be performed by using a plurality of aggregated component carriers. The carrier aggregation may be performed by using a plurality of aggregated downlink component carriers. The carrier aggregation may be performed by using a plurality of aggregated uplink component carriers.

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

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

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

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

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

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

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

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

[0044] The receiving unit of the terminal device 1 receives the PSCCH. The reception processing unit of the terminal device 1 performs processing such as demodulation and decoding. The receiving unit of the terminal device 1 performs a process of detecting side link control information. The receiving unit of the terminal device 1 determines frequency resources (interlaces and resource blocks, which will be described later). The receiving unit of the terminal device 1 determines OFDM symbols in which the PSCCH can be arranged. The receiving unit of the terminal device 1 blindly decodes the PSCCH. The receiving unit of the terminal device 1 blindly decodes the PSCCH in one slot in one resource pool. The receiving unit of the terminal device 1 blindly decodes the PSCCH in one slot in one resource pool. The PSCCH in two or more slots may be blindly decoded. Two or more PSCCHs in one slot may be blindly decoded within one resource pool. The receiving unit of the terminal device 1 receives the PSSCH. The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PSSCH. The receiving unit of the terminal device 1 receives the PSFCH. The reception processing unit receives the HARQ-ACK via the PSFCH.

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

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

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

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

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

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

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

[0052] For example, the radio resource control layer processing unit 16 may receive an RRC message on a certain logical channel. and set the acquired RRC parameters in a storage area of ​​the terminal device 1. The RRC parameters set in the storage area of ​​the terminal device 1 may be provided to a lower layer.

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

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

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

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

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

[0058] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures carrier aggregation based on the carrier aggregation configuration. The radio resource control layer processing unit 16 configures a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform reception processing on the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing on the uplink component carrier configured in the carrier aggregation configuration.

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

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

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

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

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

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

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

[0066] The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal and removes unnecessary frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0067] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 extracts a CP (Cyclic Prefix) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform on the signal from which the CP has been removed. A Fast Fourier Transform (FFT) is performed to extract the frequency domain signal.

[0068] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the physical signal to generate an OFDM symbol. The baseband unit 13 adds a CP to the symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0069] The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, and up-converts the analog signal to a carrier frequency. The RF unit 12 converts the RF signal to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

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

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

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

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

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

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

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

[0077] 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 includes a radio transmission / reception unit 30 and a higher layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 , a medium access control layer processing unit 35, and a radio resource control layer processing unit 36. The radio transceiver unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

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

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

[0080] The radio resource control layer processing unit 36 ​​included in the upper layer processing unit 34 performs RRC layer processing. The RRC layer processing may include some or all of broadcast signal management, RRC connection / RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates downlink data (transport blocks) to be allocated to the PDSCH, system information, RRC messages, MAC CE, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

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

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

[0083] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. A plurality of PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 ​​sets a search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search space for the terminal device 1. Determine.

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

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

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

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

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

[0089] The radio resource control layer processing unit 36 ​​performs carrier aggregation configuration for the terminal device 1. The radio resource control layer processing unit 36 ​​performs carrier aggregation configuration by configuring a serving cell (secondary cell, primary secondary cell). The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 so that the terminal device 1 performs transmission processing using downlink component carriers set in the carrier aggregation configuration. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 so that the terminal device 1 performs reception processing using uplink component carriers set in the carrier aggregation configuration.

[0090] The radio resource control layer processing unit 36 ​​performs sidelink-related settings for the terminal device 1. The radio resource control layer processing unit 36 ​​sets parameters related to the sidelink for the terminal device 1 and notifies the terminal device 1 via the radio transceiver unit 30. For example, the following information is used as the parameters related to the sidelink. Sidelink BWP configuration Sidelink radio bearer configuration Sidelink measurement configuration

[0091] The information indicating the configuration of the Sidelink BWP is the symbol in the slot used for the Sidelink. start position, symbol length, PSBCH configuration, sidelink resource pool configuration, etc. The information indicating the PSBCH configuration includes information indicating parameters used for PSBCH transmission power control. The information indicating the sidelink resource pool configuration includes information indicating the configuration of a sidelink reception resource pool, the configuration of a sidelink transmission resource pool, etc. The configuration of the sidelink transmission resource pool includes the configuration of a transmission resource pool for a method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1, and the configuration of a transmission resource pool for a method (mode 2) in which the terminal device 1 autonomously selects resources.

[0092] The information indicating the configuration of the sidelink resource pool includes information indicating the configuration of the PSCCH, information indicating the configuration of the PSSCH, information indicating the configuration of the PSFCH, and information indicating the subchannel size of the sidelink , information indicating the start position of the sidelink subchannel, MCS test used in the sidelink Information indicating the cable, information indicating the sidelink PTRS configuration, and sidelink TDD UL-DL configuration information indicating the number of PRBs in the side link resource pool; information indicating the time resources of the sidelink, information indicating the parameters of the sidelink transmission power control, information indicating the maximum number of reserved PSCCH / PSSCH resources that can be indicated by one SCI, The information includes information indicating the set of sensing intervals, information indicating whether the PSCCH or PSSCH DM RS is used for L1 RSRP measurement in the sensing operation, information indicating the start position of the sensing window, information indicating the end position of the sensing window, and information indicating the sidelink synchronization configuration.

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

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

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

[0096] The information indicating the configuration of the PSSCH includes information indicating candidates for β offsets used to determine the number of coded modulation symbols of the 2nd stage SCI, information indicating the time domain pattern of the DM RS of the PSSCH, and information indicating a scaling factor for limiting the number of resource elements allocated to the 2nd stage SCI of the PSSCH.

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

[0098] The information indicating parameters for sidelink transmission power control includes information indicating parameters used for sidelink path loss-based transmission power control and information indicating parameters used for downlink path loss-based transmission power control.

[0099] The information indicating the sidelink synchronization configuration includes information indicating whether the sidelink synchronization configuration is used for transmitting and receiving the sidelink synchronization signal when the terminal device 1 is synchronized to GNSS, or whether the sidelink synchronization configuration is used for transmitting and receiving the sidelink synchronization signal when the terminal device 1 is synchronized to the base station device 3, information indicating the type of hysteresis when evaluating the synchronization reference terminal device 1, information indicating the number of sidelink SSB transmissions in one sidelink SSB period, information indicating the period and start position of the sidelink SSB, information indicating the ID of the sidelink synchronization signal, and It includes information indicating a threshold value used to determine whether to send a drink synchronization signal.

[0100] The information indicating the configuration of the sidelink radio bearer includes information indicating whether the terminal device 1 is a synchronization source, information indicating parameters used to detect a sidelink radio link failure, information indicating the frequency used for the sidelink, information indicating the configuration for a method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1, information indicating the configuration for a method (mode 2) in which the terminal device 1 autonomously selects resources, information indicating the configuration for CSI reporting, Information indicating whether sidelink scheduling is used, information indicating the configuration of sidelink scheduling requests, information indicating the priority of sidelink SSB transmission and reception, information indicating the RLC mode, information indicating the configuration of sidelink logical channels, information indicating the configuration of sidelink RLC, etc. Includes:

[0101] The information indicating the frequency at which the sidelink is used further includes information indicating the subcarrier spacing, information indicating the frequency position of the sidelink SSB, information indicating the synchronization priority, and the like.

[0102] The information indicating the configuration for the method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1 includes information indicating an RNTI used by the base station device 3 to scramble the CRC of a DCI format (e.g., DCI format 3_0) including scheduling information for the terminal device 1, information indicating the configuration of the sidelink MAC, and information indicating the configuration of the sidelink Configured Grant. The information indicating the configuration of the sidelink MAC includes information indicating the configuration of the sidelink BSR and information indicating thresholds used to determine the priorities of sidelink transmission and uplink transmission. The information indicating the configuration of the sidelink Configured Grant includes information indicating an ID for identifying the sidelink Configured Grant, information indicating the frequency resource of the sidelink Configured Grant, information indicating the time resource of the sidelink Configured Grant, information indicating the HARQ process ID of the sidelink Configured Grant, information indicating the resources used for sidelink HARQ-ACK transmission, and information indicating the duration of the sidelink Configured Grant. The sidelink configured grant information includes information indicating the resource pool to which the sidelink configured grant is applied, information indicating the starting subchannel of the sidelink configured grant, etc.

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

[0104] The information indicating the configuration of the sidelink logical channel includes information indicating the sidelink logical channel priority, information indicating the configuration of the scheduling request applicable to the sidelink logical channel, information indicating the bit rate, information indicating the sidelink bucket size interval, information indicating whether HARQ feedback is applied to the sidelink logical channel, information indicating the subcarrier spacing applied to the resource to which the sidelink logical channel is mapped, information indicating the maximum physical channel interval of the resource to which the sidelink logical channel is mapped, information indicating the ID of the sidelink logical channel group, etc.

[0105] The information indicating the configuration of the sidelink measurements includes information indicating the frequency at which the sidelink measurements are performed, information indicating the filter coefficients applied to the sidelink measurements, information indicating the interval at which the sidelink measurement results are reported, information indicating the threshold used to decide whether to report the sidelink measurement results, information indicating the interval used to decide whether to report the sidelink measurement results, etc.

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

[0107] The medium access control layer processing unit (MAC layer processing unit) 35 activates the secondary cell. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs that instruct activation / deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs that instruct activation / deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs that instruct activation / deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 performs the The serving cell is deactivated by measuring with a timer whether scheduling has been performed for a certain period of time, and the radio transceiver 30 is controlled.

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

[0109] The radio transceiver 30 may perform one or both of a demodulation process and a decoding process. The radio transceiver 30 may deliver a transport block of information detected based on demodulation and decoding of the received physical signal to a higher layer on the UL-SCH. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical channel. Here, the transport block delivered from a higher layer on the DL-SCH may be mapped to the downlink physical channel. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical signal.

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

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

[0112] The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transmitting / receiving unit 30 notifies the terminal device 1 of the PDCCH candidates within the search space of the control resource set. The PDCCH is transmitted using the

[0113] The transmitter (also referred to as a transmission processor) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The PDCCH is transmitted using the PDCCH candidates in the search area where the matching is performed.

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

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

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

[0117] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unnecessary frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0118] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a CP (Cyclic Prefix) from the digitized baseband signal. Alternatively, a fast Fourier transform (FFT) may be performed on the subband signal to extract a frequency domain signal.

[0119] The baseband unit 33 may generate a baseband signal by performing an Inverse Fast Fourier Transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal to which the CP has been added into an analog signal. The baseband unit 33 may output the analog baseband signal to the RF unit 32.

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

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

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

[0123] The physical signal is a general term for a downlink physical channel, a downlink physical signal, an uplink physical channel, and an uplink physical channel. The physical channel is a general term for a downlink physical channel and an uplink physical channel. The physical signal is a general term for a downlink physical signal and an uplink physical signal.

[0124] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by the radio transceiver unit 10. An uplink physical channel may be received by the radio transceiver unit 30. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical channels are used: ·PUCCH (Physical Uplink Control CHannel) ·PUSCH (Physical Uplink Shared CHannel) ·PRACH(Physical Random Access CHannel)

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

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

[0127] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0128] The HARQ-ACK information may be configured by HARQ-ACK bits corresponding to one transport block (TB). The HARQ-ACK bits may indicate an acknowledgement (ACK) or a negative acknowledgement (NACK) corresponding to the transport block. An ACK may indicate that the transport block has been decoded successfully. A NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

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

[0130] A scheduling request may be used to request UL-SCH resources for an initial transmission. The scheduling request bit is either a positive SR or may be used to indicate either a negative SR. When the scheduling request bit indicates a positive SR, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that the terminal device 1 requests UL-SCH resources for the initial transmission. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that the terminal device 1 does not request UL-SCH resources for the initial transmission.

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

[0132] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal used for channel measurement. The channel measurement may include interference measurement.

[0133] The PUCCH may have a PUCCH format, where the PUCCH format is The PUCCH format may be a format of physical layer processing of the PUCCH. Also, the PUCCH format may be a format of information transmitted using the PUCCH.

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

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

[0136] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in a physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present embodiment, some or all of the following uplink physical signals may be used. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal)

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

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

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

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

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

[0142] A downlink physical channel may correspond to a set of resource elements carrying information originating at higher layers. The downlink physical channels may be physical channels used in the carrier. The radio transceiver 30 may transmit the downlink physical channels. The radio transceiver 10 may receive the downlink physical channels. In the downlink of the radio communication system according to one aspect of the present embodiment, some or all of the following downlink physical channels may be used. ·PBCH(Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH(Physical Downlink Shared Channel)

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

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

[0145] The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may be It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[0146] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and the downlink control information may be described as equivalent. For example, the base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. The terminal device 1 may transmit the downlink control information included in the detected DCI format to the terminal device 1. In addition, the terminal device 1 may control the radio transmission / reception unit 10 using the downlink control information included in the detected DCI format. It may be controlled.

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

[0148] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format DCI formats such as DCI format 0_0 and DCI format 0_1 ​​are used. The uplink DCI format is a general term for DCI format 0_0, DCI format 0_1, etc. The downlink DCI format is a general term for DCI format 1_0 and DCI format 1_1, etc.

[0149] DCI format 0_0 is used for scheduling PUSCH allocated to a certain cell. DCI format 0_0 is configured to include at least some or all of 1A to 1E. 1A) Identifier for DCI formats field 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (Modulation and Coding Scheme field)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0176] DCI format 1_1 is used for scheduling PDSCH allocated to a certain cell. DCI format 1_1 is composed of some or all of 4A to 4I. 4A) DCI Format Specific Fields 4B) Frequency domain resource allocation field 4C) Time Domain Resource Allocation Field 4E) MCS Field 4F) PDSCH_HARQ feedback timing indication field 4G) PUCCH resource indication field 4H) BWP Field 4I) Career Indicator Field

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

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

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

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

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

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

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

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

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

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

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

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

[0189] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be arranged in the PDSCH. The base station device 3 transmits the PDSCH in which the transport block is arranged. The terminal device 1 receives a PDSCH in which a transport block is arranged. Good too.

[0190] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used. ·Synchronization signal (SS) ·DL DMRS(DownLink DeModulation Reference Signal) ·CSI-RS(Channel State Information-Reference Signal) ·DL PTRS(DownLink Phase Tracking Reference Signal)

[0191] The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal includes a PSS (Primary Synchronization Signal) and and SSS (Secondary Synchronization Signal).

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

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

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

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

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

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

[0198] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

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

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

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

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

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

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

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

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

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

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

[0209] One or more control resource sets (CORESET: Control Resource SET) may be configured in the terminal device 1. The terminal device 1 may transmit a PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and The PDCCH monitoring may also include a set of PDCCH and / or PDCCH candidates. and / or monitoring and detecting the DCI format transmitted via the PDCCH.

[0210] A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

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

[0212] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates may be determined by the number of CCEs constituting the PDCCH. The PDDCH candidates may be mapped to one or more CCEs.

[0213] The search area set may be configured to include at least one or more search areas, and an index (search area index) may be assigned to each search area.

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

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

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

[0217] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto the PUCCH and transmit the UCI. The terminal device 1 may multiplex the UCI onto the PUSCH and transmit the UCI. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0218] HARQ-ACK is also known as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information. It may also be called.

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

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

[0221] An NDI (New Data Indicator) is indicated in a DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) that includes scheduling information for PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an NDI value for each HARQ process for each terminal device 1. The terminal device 1 detects the NDI field of the DCI format. The base station device 3 sets the updated NDI value or the NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 receives the HARQ process identifier field of the detected DCI format. For the HARQ process corresponding to the value, the stored NDI value is updated using the NDI field of the detected DCI format.

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

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

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

[0225] dl-DataToUL-ACK indicates a list of timings of HARQ-ACK for PDSCH. The timing is the slot in which HARQ-ACK for the received PDSCH is transmitted, based on the slot in which the PDSCH is received (or the slot containing the last OFDM symbol to which the PDSCH is mapped). For example, dl-DataToUL-ACK can be 1, 2, or 3. 1, 4, 5, 6, 7, or 8 timing lists If DL-DataToUL-ACK contains a single timing list, the HARQ indication field is 0 bit. If DL-DataToUL-ACK is a list of two timings, the HARQ indication field The field is 1 bit. If Dl-DataToUL-ACK is a list of 3 or 4 timings, If there are 5 or 6 DL-DataToUL-ACKs, or For example, dl-DataToUL-ACK can be selected from a list of timings with a value between 0 and 31. For example, dl-DataToUL-ACK is a timing value between 0 and 63. It consists of a list of tags.

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

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

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

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

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

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

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

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

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

[0235] The term "physical signal" is also a general term for the sidelink physical channel and the sidelink physical signal. The term "physical channel" is also a general term for the sidelink physical channel. The term "physical signal" is also a general term for the sidelink physical signal.

[0236] The sidelink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. The sidelink physical channel is a physical channel used in the sidelink. The sidelink physical channel may be transmitted by the radio transceiver unit 10. The sidelink physical channel may be received by the radio transceiver unit 10. In a wireless communication system according to one aspect of the present embodiment, at least one of the following may be included: All sidelink physical channels are used. ·PSBCH(Physical Sidelink Broadcast CHannel) ·PSCCH(Physical Sidelink Control CHannel) ·PSSCH(Physical Sidelink Shared CHannel) ·PSFCH (Physical Sidelink Feedback CHannel)

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

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

[0239] The sidelink control information is transmitted and received in the sidelink control information format (SCI format). The SCI transmitted and received on the PSCCH is st The SCI transmitted and received on the PSSCH is called the 2 stage SCI. nd This is called stage 1 SCI. st Even if the stage SCI format includes SCI format 1-A SCI format 1-A is PSSCH and 2 nd Used for scheduling of stage SCI. SCI format 1-A has a field indicating priority, a field indicating frequency resource allocation, a field indicating time resource allocation, a field indicating resource reservation interval, a field indicating DM RS pattern, and 2 ndA field indicating the stage SCI format (SCI format 2-A, SCI format 2-B), a beta offset (2 nd It includes a field indicating the number of DM RS ports, a field indicating the MCS, a field indicating the MCS table, and a field containing a PSFCH overhead indication.

[0240] 2 nd The stage SCI is used for decoding the PSSCH. SCI format 2-A is the HARQ process number. Number, NDI, RV (Redundancy version), Source ID, Destination ID, HARQ feedback enable / disable indicator, cast type indicator (unicast SCI format 2-B includes information on HARQ process number, NDI, RV, Source ID, Destination ID, HARQ feedback Contains information on enable / disable indicator, Zone ID, and communication range request.

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

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

[0243] The sidelink physical signal may correspond to a set of resource elements. The sidelink physical signal may not be used to convey information generated in a higher layer. The sidelink physical signal may be used to convey information generated in a physical layer. The radio transceiver 10 may transmit the sidelink physical signal. The radio transceiver 10 may receive the sidelink physical signal. In the sidelink of the system, at least some or all of the following sidelink physical signals may be used: Sidelink Synchronization Signal (S-SS) Side link DM RS Sidelink CSI-RS Side link PT-RS

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

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

[0246] The sidelink CSI-RS is a reference signal used for sidelink channel measurement. It includes time resource allocation (symbol positions where the CSI-RS is allocated), frequency resource allocation, the number of antenna ports, and the number of layers for the CSI-RS. The terminal device 1 reports channel state information measured based on the sidelink CSI-RS using MAC CE.

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

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

[0249] The terminal device 1 may use the uplink PUCCH to report information about the sidelink HARA-ACK received from the destination terminal device 1 to the base station device 3. A semi-static HARQ-ACK codebook or a dynamic HARQ-ACK codebook may be used.

[0250] The base station device 3 may notify the terminal device 1 of sidelink scheduling information using a DCI format. DCI format 3_0 is used for scheduling the PSCCH and PSSCH. DCI format 3_0 is configured to include some or all of the following information: Resource Pool Index Time gap HARQ process number NDI Sub-channel allocation information SCI format 1_A field Timing indicator for feeding back HARQ-ACK of PSSCH corresponding to PSFCH reception PUCCH resource indicator Configuration Index Sidelink allocation index counter

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

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

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

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

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

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

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

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

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

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

[0261] The terminal device 1 determines whether a transmission opportunity (Transmission Opportunity : TxOP (Channel Occupancy) is acquired and transmission is performed, and if the LBT result is busy (LBT-busy), transmission is not performed. The time of the transmission opportunity is called Channel Occupancy Time (COT). COT is the total time length of all transmissions within the transmission opportunity and gaps within a specified time, and may be less than or equal to the Maximum COT (MCOT). MCOT is determined based on the channel access priority class. A channel access priority class may be associated with a contention window size.

[0262] Channel access priority classes are defined and used. For example, four channel access priority classes (channel access priority class 1, channel access priority class 2, channel access priority class 3, and channel access priority class 4) are defined and used. In channel access priority class 1, the minimum contention window size is 3 slots, the maximum contention window size is 7 slots, and the allowed contention window size is 10 ... There are two contention window sizes: 3 slots and 7 slots. For channel access priority class 2, the minimum contention window size is 7 slots and the maximum contention window size is 10 slots. The channel access priority class is 3, and the contention window size is 15 slots. The allowed contention window sizes are 7 slots and 15 slots. The minimum contention window size is 15 slots, the maximum contention window size is 1023 slots, and the allowed contention window sizes are {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. }. Channel access priority class 4 has the lowest contention rate. The contention window size is 15 slots, the maximum contention window size is 1023 slots, and there are seven allowed contention window sizes: {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. Note that the contention window size may also represent the number of counts per slot.

[0263] If the terminal device 1 determines that the channel is busy by carrier sensing during the sensing slot time, it senses whether the channel is idle in the defer interval. The defer interval consists of 16 us and multiple sensing slots. The number of sensing slots that make up the defer interval is determined by the channel. It depends on the channel access priority class. In channel access priority class 1, about two sensing slots are configured in the defer section. In priority class 2, two sensing slots are configured in the defer section. In access priority class 3, three sensing slots are configured in the defer section. In channel access priority class 4, about seven sensing slots are configured in the defer interval. If the terminal device 1 determines that the channel is busy in the defer interval, it determines again in a new defer interval whether the channel is idle. If the terminal device 1 determines that the channel is idle in the defer interval, it decrements the counter value set based on the contention window size, and continues to perform carrier sense at each sensing slot time to determine whether the channel is idle.

[0264] Applying the contention window size to sensing the channel may include using the contention window size to generate a back-off counter for sensing the channel.

[0265] The terminal device 1 applying HARQ-ACK feedback enable in sidelink transmission may include the terminal device 1 being indicated with HARQ-ACK feedback from the terminal device 1 at the transmission destination. Applying the disable may include the terminal device 1 not receiving HARQ-ACK feedback from the destination terminal device 1. The disable setting is SCI format 2-A / 2-B, sl-PSFCH-Period, sl-HARQFeedbackEnabled. It may be set to either one.

[0266] 1-bit HARQ feedback enable / disable for SCI format 2-A / 2-B The terminal device 1 may apply HARQ-ACK feedback enable by setting the value of this field to 1. Setting the value of this field to 0 may disable HARQ-ACK feedback. The configuration information of a resource pool may include sl-PSFCH-Period. sl-PSFCH-Period indicates the period of the PSFCH resource in slot units within that resource pool, and is represented by sl0, sl1. , sl2, sl4. When the terminal device 1 sets sl0, it All spool transmissions may be HARQ-ACK feedback disabled. The base station device 3 may apply HARQ-ACK feedback enable by setting sl1, sl2, and sl4. This field indicates whether HARQ feedback is enabled or disabled. There are two types of parameters for sl-HARQ-FeedbackEnabled: enabled and disabled. If sl-HARQ-FeedbackEnabled is set to enabled, HARQ-ACK feedback enable may be applied to the logical channel of the sidelink. If disabled is set, HARQ-ACK feedback disable may be applied to the logical channel of the sidelink.

[0267] FIG. 8 shows an example of sidelink transmission transmitted in the terminal device 1 according to one aspect of this embodiment. The terminal device 1 may be any one of the terminal devices 1A to 1D in FIG. The terminal device 2 is any one of the terminal devices 1A to 1D in FIG. 1 that is performing sidelink communication with the terminal device 1. 801 is a HARQ-ACK feedback enable signal from terminal device 1 to terminal device 2. 802 may be a transmission to which a contention window size is applied. 802 may be HARQ-ACK feedback for the sidelink transmission of 801. 803 may be a sidelink transmission from terminal device 1 to terminal device 2 that is performed after 801. Terminal device 1 may determine a contention window size before the sidelink transmissions of 801 and 803. Terminal device 1 may apply the determined contention window size to channel sensing, and perform sidelink transmission if channel sensing is successful.

[0268] The terminal device 1 may determine a contention window size for channel sensing before performing the first sidelink transmission. The terminal device 1 may determine the contention window size based on HARQ-ACK feedback of a second sidelink transmission with HARQ-ACK feedback enabled performed before the first sidelink transmission. Upon receiving an ACK from the terminal device 1 to which the transmission is directed, the terminal device 1 determines the minimum contention window size. The terminal device 1 may set the contention window size to the next largest value when receiving a NACK from the destination terminal device 1. The terminal device 1 may set the contention window size to the next largest value when performing a transmission including retransmission if the result of HARQ-ACK feedback is not obtained. The terminal device 1 may maintain the contention window size when performing a transmission not including retransmission if the result of HARQ-ACK feedback is not obtained. For example, in FIG. 8, when performing a sidelink transmission 801, the terminal device 1 may update the contention window size based on the result of 802 before the sidelink transmission 803. If 802 is an ACK, the terminal device 1 may set the contention window size to the next largest value when performing a transmission including retransmission if the result of HARQ-ACK feedback is not obtained. The terminal device 1 may set the contention window size to the minimum value before the sidelink transmission of 802. If 802 is a NACK, the terminal device 1 may set the contention window size to the next largest value before the sidelink transmission of 803. If 802 is not received, the terminal device 1 may , when the terminal device 1 performs a transmission including a retransmission, a contention is generated before the sidelink transmission 803. The window size may be set to the next larger value. In this case, when the terminal device 1 performs a transmission that does not include a retransmission, the Maintain the contention window size.

[0269] The terminal device 1 may determine a contention window size for channel sensing before performing a first sidelink transmission. The terminal device 1 may determine the contention window size based on a first number of second sidelink transmissions with HARQ-ACK feedback disabled. The first number may be the number of second sidelink transmissions with HARQ-ACK feedback disabled before performing the first sidelink transmission. The terminal device 1 may set a second number as a threshold for determining the contention window size. The second number may be one or more. The terminal device 1 may determine the contention window size based on whether the first number is smaller than the second number. If the first number is smaller than the second number, the contention window size may be maintained. If the first number is not smaller 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 perform transmission if the channel sensing is successful.

[0270] FIG. 9 shows an example of sidelink transmission transmitted in the terminal device 1 according to one aspect of this embodiment. 1 is a diagram illustrating an example. The terminal device 1 may include any of the terminal devices 1A to 1D in FIG. The terminal device 2 is one of the terminal devices 1A to 1D in FIG. 1 that is performing sidelink communication with the terminal device 1. 901 is a HARQ-ACK feedback data from terminal device 1 to terminal device 2. 902 may be a sidelink transmission from the terminal device 1 to the terminal device 2 with HARQ-ACK feedback disable applied, performed after 901. 903 may be a sidelink transmission from the terminal device 1 to the terminal device 2 with HARQ-ACK feedback disable applied, performed after 902. 904 may be a sidelink transmission from the terminal device 1 to the terminal device 2, performed after 903. The terminal device 1 may determine a contention window size before the sidelink transmissions of 901 to 904. The terminal device 1 may apply the determined contention window size to channel sensing, and perform sidelink transmission if the channel sensing is successful.

[0271] For example, in FIG. 9, it is assumed that the terminal device 1 sets the second count to 3. The terminal device 1 may perform sidelink transmission 901. In this case, the first count is 1. Since the number of times is smaller than the second number of times, the terminal device 1 transmits the sidelink signal 902 on the channel before the sidelink transmission. The contention window size for sensing the channel is set as 901. The terminal device 1 may perform sidelink transmission 902. In this case, the first number is 2. Since the first number is smaller than the second number, The terminal device 1 performs content sensing for channel sensing before transmitting the sidelink signal 903. Even if the contention window size is maintained at the contention window size set in 902, The terminal device 1 may perform sidelink transmission 903. At this time, the first count is 3. Since the first count is not smaller than the second count, the terminal device 1 may perform sidelink transmission 904. The terminal device 1 may update the contention window size set in 903 to the contention window size for sensing the channel before performing the data transmission. The terminal device 1 may apply the contention window size to channel sensing. If channel sensing is successful, the terminal device 1 may perform sidelink transmission 904.

[0272] FIG. 10 is a diagram illustrating an example of setting the contention window size of a terminal device according to one aspect of this embodiment. The terminal device 1 that has started sidelink transmission may determine an initial contention window size and apply the determined contention window size to channel sensing (step 1001). If channel sensing is successful, the terminal device 1 may start sidelink transmission. The terminal device 1 may perform sidelink transmission with HARQ-ACK feedback disabled (step 1002). The terminal device 1 determines whether or not a counter n indicating the number of times sidelink transmission with HARQ-ACK feedback disabled has been performed is smaller than a second number of times. The terminal device 1 may determine whether the counter n is smaller than the second number of times (step 1003). If it is determined that the contention window size is equal to or greater than the second number of times (step 1003: YES), the terminal device 1 may maintain the contention window size and increment the counter n by one (step 1004). If it is determined that the counter n is not smaller than the second number of times (step 1003: NO), the terminal device 1 may update the contention window size. Then, the counter n may be reset (step 1005). The process may be repeated from step 1001. It may be determined whether 1 is smaller than the second number of times.

[0273] The terminal device 1 may set a counter n that counts the first number of times. The initial value of the counter n may be set to 0. The terminal device 1 may increment the counter n when performing a sidelink transmission with HARQ-ACK feedback disabled. 1 resets counter n when the contention window size is updated. For example, in FIG. 10, when the terminal device 1 performs sidelink transmission with HARQ-ACK feedback disabled, a determination is made in 1003. If the counter n is smaller than the second number of times, Then, the terminal device 1 proceeds to step 1004, maintains the contention window size, and increments the counter n by 1. When the ID link is transmitted, if the counter n is not smaller than the second number in the determination of 1003, The terminal device 1 may proceed to step 1005, update the contention window size, and reset the counter n. In the case where the sidelink transmission is a broadcast transmission, the terminal device 1 may regard it as a sidelink transmission with HARQ-ACK feedback disabled. That is, the sidelink transmission with HARQ-ACK feedback disabled applied by the terminal device 1 may be a sidelink transmission with a cast type of broadcast transmission.

[0274] When the terminal device 1 performs a sidelink transmission with HARQ-ACK feedback enabled, the terminal device 1 may reset the counter n to the initial value 0. Also, when the terminal device 1 performs a sidelink transmission with HARQ-ACK feedback enabled, the terminal device 1 may maintain the count n.

[0275] The terminal device 1 may set a counter n for each channel access priority class. The terminal device 1 sets a counter n common to all channel access priority classes. The terminal device 1 may reset the counter n when performing sidelink transmission with a different channel access priority class. When sidelink transmissions with different access priority classes are made, the counter n is maintained. For example, when the terminal device 1 sets a counter n for each channel access priority class, the terminal device 1 may set a counter n for each channel access priority class. An independent counter n may be assigned to each of priority class 2, channel access priority class 3, and channel access priority class 4. 1: Set a common counter n for all channel access priority classes. , channel access priority class 1, channel access priority class 2, channel access priority class 3, and channel access priority class 4 may be assigned a common counter n.

[0276] When updating the contention window size, the terminal device 1 may set the contention window size to the next largest value. When updating the contention window size, the terminal device 1 may set the contention window size to the previous smallest value. When updating the contention window size, the terminal device 1 may set the contention window size to the smallest value. When updating the contention window size, the terminal device 1 may set the contention window size to the largest value. The terminal device 1 may set the contention window size to the next largest value. When updating the contention window size, the terminal device 1 may set the contention window size randomly. When updating from the maximum contention window size to the next largest value, the terminal device 1 may set the minimum contention window size. When updating from the minimum contention window size to the previous smallest value, the terminal device 1 may set the maximum contention window size. The terminal device 1 may update the contention window size by setting the contention window size to the next largest value, and when the maximum contention window size is reached, it may set the contention window size to the minimum. The terminal device 1 may update the contention window size by setting the contention window size to the next smallest value, and when the minimum contention window size is reached, it may set the contention window size to the maximum. As an example, it is assumed that the terminal device 1 updates the contention window size from 127 slots with channel access priority class 4. The contention window size allowed in channel access priority class 4 is There are seven contention window sizes: {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. When the terminal device 1 sets the contention window size to the next larger value, it may set it to 255 slots. When the terminal device 1 sets the contention window size to the previous small value, it may be set to 63 slots. When the terminal device 1 sets the contention window size to the smallest contention window size, it may be set to 15 slots. When the terminal device 1 sets the contention window size to the largest contention window size, it may be set to 1023 slots. When the terminal device 1 sets the contention window size randomly, it may be set to any of the following values ​​other than 127 slots: 15 slots, 31 slots, 63 slots, 255 slots, 511 slots, 1023 slots The contention window size may be set randomly from 15 slots to the previous smaller value. If the terminal device 1 sets the contention window size from the minimum of 15 slots to the previous smaller value, the contention window size may be set to the maximum, i.e., 1023 slots. If the terminal device 1 sets the contention window size from the maximum of 1023 slots to the next larger value, the contention window size may be set to the minimum, i.e., 15 slots.

[0277] The second number of times may be set for each resource pool. Information indicating the second number of times for each resource pool may be notified to the terminal device 1 by RRC signaling. In addition, the second number of times may be set for each resource pool. The second count may be set for each channel access priority class. Information indicating the second count for each channel access priority class is notified to the terminal device 1 by RRC signaling. The second number of times may be set for each terminal device. Information indicating the second number of times may be notified to the terminal device 1 by RRC signaling.

[0278] The terminal device 1 may determine a contention window size for channel sensing before performing the first sidelink transmission. If HARQ-ACK feedback disable is applied to a second sidelink transmission performed before the first sidelink transmission, the terminal device 1 may randomly set a contention window size for the first sidelink transmission. The terminal device 1 may apply the randomly set contention window size to channel sensing and perform the first sidelink transmission if the channel sensing is successful. The terminal device 1 may randomly set a contention window size to be applied to channel sensing for the first sidelink transmission, excluding the contention window size applied to channel sensing for the second sidelink transmission. The terminal device 1 may randomly set a contention window size to be applied to channel sensing for the first sidelink transmission, including the contention window size applied to channel sensing for the second sidelink transmission. The terminal device 1 may apply the randomly set contention window size to channel sensing and perform the first sidelink transmission if the channel sensing is successful. For example, if terminal device 1 is a contention winner with channel access priority class 4, A 127-slot hop is used for channel sensing and a second sidelink transmission is performed. If the terminal device 1 does not include the contention window size applied in sensing the channel for the second sidelink transmission in the contention window size for sensing the channel for the first sidelink transmission, the terminal device 1 uses 15 slots other than 127 slots. The terminal device 1 may randomly set the contention window size from 15 slots, 31 slots, 63 slots, 255 slots, 511 slots, and 1023 slots. When the terminal device 1 includes the contention window size applied in channel sensing of the second sidelink transmission in the contention window size for channel sensing for the first sidelink transmission, the terminal device 1 may randomly set the contention window size from 15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, and 1023 slots. The terminal device 1 may apply the randomly set contention window size to channel sensing, and may perform the first sidelink transmission if channel sensing is successful.

[0279] The terminal device 1 may determine a contention window size for channel sensing before performing a first sidelink transmission. The terminal device 1 may determine the contention window size based on a third number of times the contention window size was maintained. If HARQ-ACK feedback disable is applied in a second sidelink transmission performed before the first sidelink transmission, the terminal device 1 may maintain the contention window size applied to channel sensing before the second sidelink transmission and apply it to channel sensing before the first sidelink transmission. The terminal device 1 may set a second number of times as a threshold for determining the contention window size. The second number of times may be one or more times. The terminal device 1 may determine the contention window size based on whether the third number of times is smaller than the second number of times. If the third number of times is smaller than the second number of times, the contention window size may be maintained. If the third number of times is not smaller than the second number of times, 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 perform transmission if channel sensing is successful.

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

[0281] The programs operating in the base station device 3 and terminal device 1 according to the present invention may be programs (programs that make a computer function) that control a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments according to the present invention. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing. Then, various ROMs such as Flash ROM (Read Only Memory) and HDD (Hard Disk Drive) The data is stored in the , and is read, modified, and written by the CPU as needed.

[0282] Note that the terminal device 1 and part of the base station device 3 in the above-described embodiment may be realized by a computer. In this case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the control function.

[0283] The term "computer system" as used herein refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. The term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as hard disks built into the computer system. This refers to storage devices such as hard disks.

[0284] Furthermore, "computer-readable recording media" refers to any information that is stored on a network such as the Internet. The program may include a program that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a communication line such as a network or telephone line, or a program that stores a program for a fixed period of time, such as a volatile memory inside a computer system that serves as a server or client in that case. The program may also be one that realizes part of the above-mentioned functions, or one that can realize the above-mentioned functions in combination with a program already stored in the computer system.

[0285] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0286] Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as a collection.

[0287] Furthermore, the base station device 3 in the above-described embodiment is an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-described embodiment may be configured to It may have some or all of the functions of its higher-level node.

[0288] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually integrated into a chip, or part or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, but may be a dedicated circuit, It may also be realized by a general-purpose processor. In addition, with the advancement of semiconductor technology, it may be replaced by an LSI. When integrated circuit technology emerges, it is also possible to use integrated circuits based on that technology.

[0289] Furthermore, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0290] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the invention. Furthermore, the present invention is susceptible to various modifications within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included. [Explanation of symbols]

[0291] 1(1A, 1B, 1C) Terminal equipment 3(3A, 3B, 3C) Base station equipment 10, 30 Radio transmitter / receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device includes a transmitter that determines a contention window size, senses a channel to which the contention window size is applied, and performs a first sidelink transmission, and the transmitter performs a second sidelink transmission in which HARQ-ACK feedback is disabled. a terminal device for determining the contention window size based on a first number of link transmissions;

2. 2. The terminal device according to claim 1, further comprising: if the first number of times is smaller than the second number of times, the transmitting unit does not update the contention window size; and if the first number of times is not smaller than the second number of times, the transmitting unit updates the contention window size. Place.

3. A communication method for a terminal device, comprising: determining a contention window size; applying the contention window size to channel sensing; and performing a first sidelink transmission, the communication method comprising: determining the contention window size based on a first number of second sidelink transmissions in which HARQ-ACK feedback is disabled.

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