Terminals and communication methods

Abstract

Determine the behavior when multiple HARQ (Hybrid Automatic Repeat Request) feedbacks occur in the unlicensed band. [Solution] The terminal includes a receiving unit that receives a first transport block and a second transport block from another terminal in the unlicensed band, a control unit that decides whether or not to transmit a first feedback channel corresponding to the first transport block and a second feedback channel corresponding to the second transport block, and a transmitting unit that transmits the feedback channels that it has decided to transmit to the other terminal.

Description

[Technical Field]

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

[0002] In LTE (Long Term Evolution) and its successor systems (e.g., LTE-A (LTE Advanced), NR (New Radio) (also known as 5G)), D2D (Device to Device) technology, which allows terminals to communicate directly with each other without going through a base station, is being considered (e.g., Non-Patent Document 1).

[0003] D2D reduces traffic between terminals and base stations, enabling communication between terminals even if base stations become inoperable during disasters or other emergencies. While 3GPP (3rd Generation Partnership Project) refers to D2D as "sidelink," this specification uses the more general term D2D. However, the term sidelink will also be used as needed in the descriptions of embodiments later.

[0004] D2D communication is broadly divided into D2D discovery (also called D2D discovery) for finding other terminals that can communicate, and D2D direct communication (also called D2D communication, terminal-to-terminal direct communication, etc.) for direct communication between terminals. In the following, unless specifically distinguished, D2D communication, D2D discovery, etc., will simply be referred to as D2D. Also, signals transmitted and received via D2D will be called D2D signals. Various use cases for V2X (Vehicle to Everything) services in NR are being considered (for example, Non-Patent Document 2).

[0005] Furthermore, NR Release 17 (e.g., Non-Patent Document 3) explores the use of higher frequency bands than previous releases. For example, it examines applicable neurology, including subcarrier spacing and channel bandwidth, physical layer design, and anticipated interferences in actual wireless communication in the frequency band from 52.6 GHz to 71 GHz. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] 3GPP TS 38.211 V17.4.0 (2022-12) [Non-Patent Document 2] 3GPP TR 22.886 V16.2.0 (2018-12) [Non-Patent Document 3] 3GPP TS 38.306 V17.3.0 (2022-12) [Non-Patent Document 4] 3GPP TS 37.213 V17.4.0 (2022-12) [Overview of the project] [Problems that the invention aims to solve]

[0007] In newly operated frequency bands using higher frequencies than before, an unlicensed band is defined. Various regulations are defined within the unlicensed band; for example, LBT (Listen before talk) must be implemented when accessing channels. When performing D2D communication in this higher frequency band, operation must comply with the regulations of the unlicensed band.

[0008] In the current PSFCH (Physical Sidelink Feedback Channel) configuration for sidelink communication in unlicensed bands, the detailed operation when multiple PSFCHs occur simultaneously was not specified.

[0009] This invention has been made in view of the above points, and aims to determine the operation when multiple HARQ (Hybrid automatic repeat request) feedbacks occur in the unlicensed band. [Means for solving the problem]

[0010] According to the disclosed technology, a terminal is provided having a receiving unit that receives a first transport block and a second transport block from another terminal in an unlicensed band, a control unit that determines whether or not to transmit a first feedback channel corresponding to the first transport block and a second feedback channel corresponding to the second transport block, and a transmitting unit that transmits the feedback channels that it has decided to transmit to the other terminal. [Effects of the Invention]

[0011] According to the disclosed technology, it is possible to determine the behavior when multiple HARQ (Hybrid automatic repeat request) feedbacks occur in the unlicensed band. [Brief explanation of the drawing]

[0012] [Figure 1] This is a diagram to explain V2X. [Figure 2] This is a sequence diagram showing an example of V2X operation (1). [Figure 3] This is a sequence diagram showing an example of V2X operation (2). [Figure 4] This is a sequence diagram showing an example of V2X operation (3). [Figure 5] This is a sequence diagram showing an example of V2X operation (4). [Figure 6] This figure shows an example of sensing operation. [Figure 7] This is a flowchart illustrating an example of preemption behavior. [Figure 8]This figure shows an example of preemption behavior. [Figure 9] This figure shows an example of partial sensing operation. [Figure 10] This is a diagram illustrating an example of periodic partial sensing. [Figure 11] This is a diagram illustrating an example of continuous partial sensing. [Figure 12] This figure shows an example of a frequency range in an embodiment of the present invention. [Figure 13] This is a diagram to explain the LBT example (1). [Figure 14] This is a diagram to explain the LBT example (2). [Figure 15] This is a diagram to explain the LBT example (3). [Figure 16] This is a diagram illustrating an example of broadband operation (1). [Figure 17] This is a diagram illustrating an example of broadband operation (2). [Figure 18] This is a diagram illustrating an example of broadband operation (3). [Figure 19] This is a diagram illustrating an example of broadband operation (4). [Figure 20] This figure illustrates an example (1) of PSFCH transmission in an embodiment of the present invention. [Figure 21] This figure illustrates an example (2) of PSFCH transmission in an embodiment of the present invention. [Figure 22] This figure illustrates an example (3) of PSFCH transmission in an embodiment of the present invention. [Figure 23] This figure shows an example of the functional configuration of the base station 10 in an embodiment of the present invention. [Figure 24] This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 25] This figure shows an example of the hardware configuration of a base station 10 or terminal 20 in an embodiment of the present invention. [Figure 26] This figure shows an example of the configuration of a vehicle 2001 in an embodiment of the present invention. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to those described below.

[0014] In the operation of the wireless communication system according to the embodiments of the present invention, existing technologies may be used as appropriate. However, such existing technologies include, for example, existing LTE, but are not limited to existing LTE. Furthermore, the term "LTE" as used herein has a broad meaning that includes LTE-Advanced and LTE-Advanced and later methods (e.g., NR), or wireless LAN (Local Area Network), unless otherwise specified.

[0015] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or any other method (for example, a Flexible Duplex).

[0016] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from the base station 10 or terminal 20 are configured.

[0017] Figure 1 is a diagram illustrating V2X. 3GPP is considering and working on specifications to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functionality. As shown in Figure 1, V2X is a part of ITS (Intelligent Transport Systems) and is a general term encompassing V2V (Vehicle to Vehicle), which refers to communication between vehicles; V2I (Vehicle to Infrastructure), which refers to communication between vehicles and roadside units (RSUs) installed along the roadside; V2N (Vehicle to Network), which refers to communication between vehicles and ITS servers; and V2P (Vehicle to Pedestrian), which refers to communication between vehicles and mobile terminals carried by pedestrians.

[0018] Furthermore, 3GPP is considering V2X using LTE or NR cellular communication and terminal-to-terminal communication. V2X using cellular communication is also called cellular V2X. For NR V2X, research is underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0019] Regarding LTE or NR V2X, it is anticipated that future considerations will extend beyond 3GPP specifications. For example, it is expected that considerations will be given to ensuring interoperability, reducing costs through the implementation of higher layers, methods for using or switching between multiple RATs (Radio Access Technologies), compliance with regulations in various countries, and methods for data acquisition, distribution, database management, and utilization of LTE or NR V2X platforms.

[0020] While the embodiments of the present invention primarily envision a configuration in which the communication device is mounted on a vehicle, the embodiments of the present invention are not limited to this configuration. For example, the communication device may be a terminal held by a person, a device mounted on a drone or aircraft, or a base station, RSU, relay station (relay node), terminal with scheduling capabilities, etc.

[0021] Furthermore, SL (Sidelink) may be distinguished from UL (Uplink) or DL ​​(Downlink) based on any one or a combination of the following 1)-4). Also, SL may have other names. 1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Reference synchronization signals (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmit power control

[0022] Furthermore, with respect to SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of the following may be applied: CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform - Spread - OFDM), OFDM without transform precoding, or OFDM with transform precoding.

[0023] In LTE's Downlink Service Line (SL), Mode 3 and Mode 4 are defined for allocating SL resources to terminal 20. In Mode 3, transmission resources are dynamically allocated via DCI (Downlink Control Information) sent from base station 10 to terminal 20. Semi-Persistent Scheduling (SPS) is also possible in Mode 3. In Mode 4, terminal 20 autonomously selects transmission resources from the resource pool.

[0024] In the embodiments of the present invention, the term "slot" may be interpreted as a symbol, mini-slot, subframe, wireless frame, or TTI (Transmission Time Interval). Furthermore, in the embodiments of the present invention, the term "cell" may be interpreted as a cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), etc.

[0025] In the embodiments of the present invention, terminal 20 is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication. For example, terminal 20 may be a user-owned terminal such as a smartphone, or it may be an IoT (Internet of Things) device such as a smart meter.

[0026] Furthermore, it is anticipated that NR-SL will support HARQ (Hybrid automatic repeat request) for sidelink unicast and groupcast. In addition, NR-V2X will define SFCI (Sidelink Feedback Control Information) that includes HARQ responses. Moreover, it is being considered that SFCI will be transmitted via PSFCH (Physical Sidelink Feedback Channel).

[0027] Note that the following explanation assumes the use of PSFCH for transmitting HARQ-ACK over a sidelink, but this is just one example. For example, you may use PSCCH to transmit HARQ-ACK over a sidelink, or PSSCH, or any other channel to transmit HARQ-ACK over a sidelink.

[0028] In the following, for convenience, all information reported by terminal 20 in HARQ will be referred to as HARQ-ACK. This HARQ-ACK may also be called HARQ-ACK information. More specifically, the codebook applied to the HARQ-ACK information reported from terminal 20 to base station 10, etc., will be called the HARQ-ACK codebook. The HARQ-ACK codebook defines the bit sequence of the HARQ-ACK information. In addition to ACK (positive response), NACK (negative response) is also transmitted with "HARQ-ACK".

[0029] Figure 2 is a sequence diagram showing an example of V2X operation (1). As shown in Figure 2, the wireless communication system according to the embodiment of the present invention may have terminals 20A and 20B. In reality, there are many user devices, but Figure 2 shows terminals 20A and 20B as examples.

[0030] Hereafter, unless otherwise specified, terminals 20A, 20B, etc., will simply be referred to as "terminal 20" or "user device." Figure 2 shows an example where both terminal 20A and terminal 20B are within the cell coverage, but the operation in the embodiment of the present invention can also be applied when terminal 20B is outside the coverage.

[0031] As described above, in this embodiment, terminal 20 is, for example, a device mounted on a vehicle such as an automobile, and has cellular communication functionality as a UE in LTE or NR, as well as side-link functionality. Terminal 20 may be a general mobile terminal (such as a smartphone). Alternatively, terminal 20 may be an RSU. The RSU may be a UE-type RSU with UE functionality, or a gNB-type RSU with base station functionality.

[0032] Furthermore, the terminal 20 does not need to be a single-casing device; for example, even if various sensors are distributed throughout the vehicle, the device including these various sensors may be considered the terminal 20.

[0033] Furthermore, the processing of the sidelink transmission data of terminal 20 is basically the same as the processing of UL transmission in LTE or NR. For example, terminal 20 scrambles the codeword of the transmission data, modulates it to generate complex-valued symbols, maps these complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, it maps the precoded complex-valued symbols to resource elements to generate a transmission signal (e.g., a complex-valued time-domain SC-FDMA signal) and transmits it from each antenna port.

[0034] The base station 10 has the functionality of a cellular communication base station in LTE or NR, and functions to enable communication for the terminal 20 in this embodiment (e.g., resource pool setting, resource allocation, etc.). The base station 10 may also be an RSU (gNB type RSU).

[0035] Furthermore, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveforms.

[0036] As a synchronization signal in the Sidelink, terminal 20 transmits a Sidelink Synchronization Signal Block (S-SSB). S-SSB may include S-PSS (Sidelink Primary Synchronization Signal), S-SSS (Sidelink Secondary Synchronization Signal), and PSBCH (Physical Sidelink Broadcast Channel). Note that the names S-SSB, S-PSS, S-SSS, etc. are examples, and other names may be used.

[0037] Terminal 20 transmits S-SSB to another terminal 20 based on a signal received from base station equipment 10, a GNSS (Global Navigation Satellite System) signal, or a signal received from another terminal 20. If terminal 20 cannot transmit S-SSB based on any of the signals from base station equipment 10, GNSS, or another terminal 20, terminal 20 may autonomously determine and transmit S-SSB to the other terminal 20. The resources available for S-SSB may be periodic slots, which may be called S-SSB opportunities.

[0038] In step S101, terminal 20A autonomously selects resources to be used for PSCCH and PSSCH from a resource selection window having a predetermined period. The resource selection window may be set from base station 10 to terminal 20. Here, the predetermined period of the resource selection window may be defined by terminal implementation conditions such as processing time or maximum allowable packet delay time, or it may be defined in advance by specifications, or the predetermined period may be called an interval in the time domain.

[0039] In steps S102 and S103, terminal 20A transmits SCI (Sidelink Control Information) via PSCCH and / or PSSCH using the resources autonomously selected in step S101, and also transmits SL data via PSSCH. For example, terminal 20A may transmit PSCCH using frequency resources adjacent to or not adjacent to the frequency resources of PSSCH, with the same time resources as at least a portion of the time resources of PSSCH.

[0040] Terminal 20B receives SCI (PSCCH and / or PSSCH) and SL data (PSSCH) transmitted from terminal 20A. The received SCI may include information about PSFCH resources for terminal 20B to send a HARQ-ACK for the reception of the data. Terminal 20A may include information about autonomously selected resources in the SCI and transmit it. Resources available for PSFCH may be periodic slots and the last symbol within a slot (excluding the final symbol), and may be called PSFCH opportunities.

[0041] In step S104, terminal 20B uses the PSFCH resources determined from the received SCI to send a HARQ-ACK for the received data to terminal 20A.

[0042] In step S105, if the HARQ-ACK received in step S104 indicates a request for retransmission, i.e., it is a NACK (negative response), terminal 20A retransmits PSCCH and PSSCH to terminal 20B. Terminal 20A may also retransmit PSCCH and PSSCH using a resource that it has autonomously selected.

[0043] If HARQ control with HARQ feedback is not performed, steps S104 and S105 do not need to be performed.

[0044] Figure 3 is a sequence diagram showing an example of V2X operation (2). Blind retransmission without HARQ control may be performed to improve the transmission success rate or range.

[0045] In step S201, terminal 20A autonomously selects resources to be used for PSCCH and PSSCH from a resource selection window having a predetermined period of time. The resource selection window may be set from base station 10 to terminal 20.

[0046] In steps S202 and S203, terminal 20A transmits SCI via PSCCH and / or PSSCH, and transmits SL data via PSSCH, using the resources autonomously selected in step S201. For example, terminal 20A may transmit PSCCH using the same time resources as at least a portion of the time resources of PSSCH, and using frequency resources adjacent to the frequency resources of PSSCH.

[0047] In step S204, terminal 20A uses the resources autonomously selected in step S201 to retransmit SCI via PSCCH and / or PSSCH and SL data via PSSCH to terminal 20B. The retransmission in step S204 may be performed multiple times.

[0048] If blind retransmission is not performed, step S204 does not need to be executed.

[0049] Figure 4 is a sequence diagram showing an example of V2X operation (3). The base station 10 may perform sidelink scheduling. That is, the base station 10 may determine the sidelink resources to be used by the terminal 20 and transmit information indicating those resources to the terminal 20. Furthermore, if HARQ control with HARQ feedback is applied, the base station 10 may transmit information indicating PSFCH resources to the terminal 20.

[0050] In step S301, base station 10 performs SL scheduling by sending DCI (Downlink Control Information) to terminal 20A via PDCCH. Hereafter, for convenience, the DCI used for SL scheduling will be referred to as SL scheduling DCI.

[0051] Furthermore, in step S301, it is assumed that the base station 10 also transmits a DCI for DL ​​scheduling (which may also be called DL allocation) to the terminal 20A via PDCCH. Hereafter, for convenience, the DCI for DL ​​scheduling will be referred to as DL scheduling DCI. Upon receiving the DL scheduling DCI, the terminal 20A receives DL data via PDSCH using the resources specified in the DL scheduling DCI.

[0052] In steps S302 and S303, terminal 20A transmits SCI (Sidelink Control Information) via PSCCH and / or PSSCH using the resources specified in the SL scheduling DCI, and also transmits SL data via PSSCH. Note that only the resources for PSSCH may be specified in the SL scheduling DCI. In this case, for example, terminal 20A may transmit PSCCH using the same time resources as at least a portion of the time resources for PSSCH, and using frequency resources adjacent to the frequency resources for PSSCH.

[0053] Terminal 20B receives SCI (PSCCH and / or PSSCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received via PSCCH and / or PSSCH contains information about the PSFCH resource that terminal 20B uses to send a HARQ-ACK for the reception of the data.

[0054] The resource information is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A retrieves the resource information from the DL scheduling DCI or SL scheduling DCI and includes it in the SCI. Alternatively, the DCI transmitted from the base station 10 may not include the resource information, and the terminal 20A may autonomously include the resource information in the SCI and transmit it.

[0055] In step S304, terminal 20B uses the PSFCH resources determined from the received SCI to send a HARQ-ACK for the received data to terminal 20A.

[0056] In step S305, terminal 20A transmits a HARQ-ACK using the PUCCH (Physical uplink control channel) resource specified by the DL scheduling DCI (or SL scheduling DCI) at a timing (e.g., a slot-based timing) specified by the DL scheduling DCI (or SL scheduling DCI), and base station 10 receives the HARQ-ACK. The codebook of the HARQ-ACK may include a HARQ-ACK generated based on the HARQ-ACK received from terminal 20B or a PSFCH that was not received, and a HARQ-ACK for DL ​​data. However, if there is no allocation of DL data, the HARQ-ACK for DL ​​data will not be included. In NR Rel.16, the codebook of the HARQ-ACK does not include a HARQ-ACK for DL ​​data.

[0057] If HARQ control with HARQ feedback is not performed, steps S304 and / or S305 may not be performed.

[0058] Figure 5 is a sequence diagram showing an example of V2X operation (4). As mentioned above, in the NR sidelink, it is supported that the HARQ response is transmitted in PSFCH format. The PSFCH format can be the same as, for example, the PUCCH (Physical Uplink Control Channel) format 0. That is, the PSFCH format may be a sequence-based format in which the PRB (Physical Resource Block) size is 1 and ACK and NACK are identified by the difference in sequence and / or cyclic shift. The PSFCH format is not limited to this. The PSFCH resource may be placed in the symbol at the end of the slot or in multiple symbols at the end. In addition, a period N is set or predetermined for the PSFCH resource. The period N may be set or predetermined on a per-slot basis.

[0059] In Figure 5, the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain. A PSCCH may be placed in the first symbol of a slot, in multiple symbols from the beginning, or in multiple symbols from symbols other than the first. A PSFCH may be placed in the last symbol of a slot, or in multiple symbols at the end of a slot. Note that the above-mentioned "beginning of the slot" and "end of the slot" may omit consideration of symbols for AGC (Automatic Gain Control) and symbols for transmit / receive switching. That is, for example, if one slot consists of 14 symbols, "beginning of the slot" and "end of the slot" may mean the first and last symbols, respectively, among the 12 symbols excluding the first and last symbols. In the example shown in Figure 5, three subchannels are set in the resource pool, and two PSFCHs are placed three slots after the slot in which the PSSCH is placed. The arrow from PSSCH to PSFCH shows an example of a PSFCH associated with a PSSCH.

[0060] If the NR-V2X group cast uses group cast option 2, where the HARQ response is either an ACK or a NACK, it is necessary to determine the resources to be used for sending and receiving PSFCH. As shown in Figure 5, in step S401, the transmitting terminal 20, terminal 20A, performs a group cast to the receiving terminals 20, terminals 20B, 20C, and 20D, via SL-SCH (Sidelink Shared Channel). In the following step S402, terminal 20B uses PSFCH#B, terminal 20C uses PSFCH#C, and terminal 20D uses PSFCH#D to send the HARQ response to terminal 20A. Here, as shown in the example in Figure 5, if the number of available PSFCH resources is less than the number of receiving terminals 20 belonging to the group, it is necessary to determine how to allocate the PSFCH resources. The transmitting terminal 20 may also know the number of receiving terminals 20 in the group cast. In group cast option 1, only a NACK is sent as the HARQ response; an ACK is not sent.

[0061] Figure 6 shows an example of sensing operation in NR. In Resource allocation mode 2, terminal 20 selects a resource and transmits it. As shown in Figure 6, terminal 20 performs sensing in the sensing window within the resource pool. Through sensing, terminal 20 receives resource reservation or resource assignment fields included in the SCI transmitted from other terminals 20, and identifies available resource candidates in the resource selection window within the resource pool based on these fields. Subsequently, terminal 20 randomly selects a resource from the available resource candidates.

[0062] Further, as shown in Figure 6, the resource pool configuration may have a period. For example, the period may be a duration of 10240 milliseconds. Figure 6 illustrates slot t0 SL to slot t Tmax-1 SL as an example of a range configured as a resource pool. The region of the resource pool within each period may be configured by, for example, a bitmap.

[0063] Further, as shown in Figure 6, a transmission trigger in the terminal 20 occurs at slot n, and the priority of the transmission is assumed to be p TX . The terminal 20, in the sensing window from slot n-T0 to the slot immediately before slot n-T proc,0 , can detect, for example, that another terminal 20 is performing transmission with priority p RX . If SCI is detected within the sensing window and RSRP (Reference Signal Received Power) exceeds a threshold, the resources in the resource selection window corresponding to the SCI are excluded. Further, if SCI is detected within the sensing window and RSRP is less than the threshold, the resources in the resource selection window corresponding to the SCI are not excluded. The threshold may be, for example, a threshold Th that is set or defined for each resource in the sensing window based on priority p TX and priority p RX pTX,pRX .

[0064] Further, like slot t shown in Figure 6 m SL , for example, for transmission purposes, resources in the resource selection window that are candidates for resource reservation information corresponding to resources in the sensing window that were not monitored are excluded.

[0065] ​As shown in Figure 6, the resource selection window from slot n+T1 to slot n+T2 identifies resources occupied by other UEs, and the resources excluded become available resource candidates. The set of available resource candidates is S A Therefore, S A If the resource selection window is less than 20%, the threshold Th is set for each resource in the sensing window. pTX,pRX You can increase the threshold Th by 3dB and perform resource identification again. pTX,pRX By increasing the value and performing resource identification again, the number of resources that are not excluded because the RSRP is below the threshold is increased, resulting in a set of resource candidates S. A It may also be necessary to ensure that it occupies 20% or more of the resource selection window. A If the resource selection window is less than 20%, the threshold Th is set for each resource in the sensing window. pTX,pRX The process of increasing the value by 3dB and re-identifying the resource may be repeated.

[0066] The lower layer of terminal 20 is S A This may be reported to the upper layer. The upper layer of terminal 20 is S A A random selection may be performed to determine which resource to use. Terminal 20 may then perform a sidelink transmission using the determined resource. For example, the upper layer may be the MAC layer, and the lower layer may be the PHY layer or the physical layer.

[0067] Although Figure 6 above illustrates the operation of the transmitting terminal 20, the receiving terminal 20 may detect data transmission from another terminal 20 based on the results of sensing or partial sensing and receive data from that other terminal 20.

[0068] Figure 7 is a flowchart showing an example of preemption in NR. Figure 8 is a diagram showing an example of preemption in NR. In step S501, terminal 20 performs sensing in the sensing window. If terminal 20 is performing power-saving operation, sensing may be performed for a predetermined limited period. Subsequently, terminal 20 identifies each resource in the resource selection window based on the sensing results and selects a set of resource candidates S A The terminal 20 then determines the set of resource candidates S and selects the resource to be used for transmission (S502). A Select a resource set (r_0, r_1, ...) from which to determine preemption (S503). This resource set may be notified to the PHY layer from the upper layer as a resource to determine whether or not preemption has occurred.

[0069] In step S504, terminal 20, at timings T(r_0)-T3 shown in Figure 8, re-identifies each resource in the resource selection window based on the sensing results and selects a set of resource candidates S. A The system determines this and then determines preemption for the resource set (r_0, r_1, ...) based on priority. For example, in Figure 8, r_1 is detected by resensing as an SCI transmitted from another terminal 20, and S A It is not included in S. If preemption is enabled, terminal 20 determines that resource r_1 has been preempted if the value prio_RX, which indicates the priority of an SCI sent from another terminal 20, is lower than the value prio_TX, which indicates the priority of a transport block sent from its own terminal. Note that a lower value indicates a higher priority. In other words, if the value prio_RX, which indicates the priority of an SCI sent from another terminal 20, is higher than the value prio_TX, which indicates the priority of a transport block sent from its own terminal, terminal 20 determines that resource r_1 has been preempted. AIt is not excluded. Alternatively, if preemption is only effective for a specific priority (for example, if sl-PreemptionEnable is one of pl1, pl2, ..., pl8), this priority is set to prio_pre. In this case, if the value prio_RX, which indicates the priority of the SCI sent from another terminal 20, is lower than prio_pre, and prio_RX is lower than the value prio_TX, which indicates the priority of the transport block sent from the terminal itself, terminal 20 determines that resource r_1 has been preempted.

[0070] In step S505, if preemption is determined in step S504, terminal 20 notifies the upper layer of the preemption, the upper layer re-selects the resource, and the preemption check is terminated.

[0071] If re-evaluation is performed instead of preemption checking, in step S504 above, the set of resource candidates S A After deciding, S A If the resource set (r_0, r_1, ...) does not contain any resources, those resources will not be used, and a re-selection of resources will be performed in the higher layer.

[0072] Figure 9 shows an example of partial sensing operation in LTE. When partial sensing is configured from the upper layer in an LTE sidelink, terminal 20 selects and transmits resources as shown in Figure 9. As shown in Figure 9, terminal 20 performs partial sensing on a portion of the sensing window in the resource pool, i.e., the sensing target. Through partial sensing, terminal 20 receives the resource reservation field included in the SCI transmitted from another terminal 20 and identifies available resource candidates in the resource selection window in the resource pool based on this field. Subsequently, terminal 20 randomly selects a resource from the available resource candidates.

[0073] Figure 9 shows subframe t0SL From subframe t Tmax-1 SL This is an example of setting the resource pool up to this point. The resource pool may also have its target area defined by, for example, a bitmap. As shown in Figure 9, the transmission trigger at terminal 20 is assumed to occur in subframe n. As shown in Figure 9, of the subframes from subframe n+T1 to subframe n+T2, subframe t y1 SL From subframe t yY SL The Y subframe up to this point may be set as the resource selection window.

[0074] Terminal 20 has a subframe t whose Y subframe length. y1-k×Pstep SL From subframe t yY-k×Pstep SL Up to one or more sensing targets, it is possible to detect, for example, that another terminal 20 is transmitting. k may be determined by, for example, a 10-bit bitmap. Figure 9 shows an example where the 3rd and 6th bits of the bitmap are set to "1", indicating that partial sensing is to be performed. That is, in Figure 9, subframe t y1-6×Pstep SL From subframe t yY-6×Pstep SL up to and subframe t y1-3×Pstep SL From subframe t yY-3×Pstep SL Up to and are set as sensing targets. As described above, the k-th bit of the bitmap is subframe t y1-k×Pstep SL From subframe t yY-k×Pstep SL It may also support a sensing window up to y. i This corresponds to the index (1...Y) within the Y subframe.

[0075] Note that k is set as a 10-bit bitmap or is predetermined, P stepIt may be 100ms. However, when performing SL communication with DL and UL carriers, P step This can also be expressed as (U / (D+S+U))*100ms, where U is the number of UL subframes, D is the number of DL subframes, and S is the number of special subframes.

[0076] If an SCI is detected in the sensing target and the RSRP exceeds the threshold, the resources in the resource selection window corresponding to the resource reservation field of that SCI are excluded. Conversely, if an SCI is detected in the sensing target and the RSRP is below the threshold, the resources in the resource selection window corresponding to the resource reservation field of that SCI are not excluded. This threshold is, for example, the sender priority p. TX and receiver priority p RX Based on this, thresholds Th are set or defined for each resource within the sensing target. pTX,pRX That's fine.

[0077] As shown in Figure 9, in the resource selection window set in the Y subframe of the interval [n+T1, n+T2], terminal 20 identifies resources occupied by other UEs, and the resources remaining after excluding those resources become the available resource candidates. Note that the Y subframes do not have to be consecutive. The set of available resource candidates is S A Therefore, S A If the number is less than 20% of the resources in the resource selection window, the threshold Th is set for each resource of the sensing target. pTX,pRX You can increase the level by 3dB and perform resource identification again.

[0078] That is, the threshold Th pTX,pRX You may increase the number of resources that are not excluded because their RSRP is below the threshold by raising the value and performing resource identification again. A Measure the RSSI of each resource and set the resource with the smallest RSSI to group S. B It may also be added to the set of resource candidates S. BUntil it fills more than 20% of the resource selection window, S A The RSSI included is the smallest resource S B You may repeat the action of adding to it.

[0079] The lower layer of terminal 20 is S B This may be reported to the upper layer. The upper layer of terminal 20 is S B Terminal 20 may perform a random selection to determine which resource to use. Terminal 20 may then use the determined resource to perform a sidelink transmission. After securing a resource once, Terminal 20 may perform a predetermined number of operations (for example, C resel (This time) Resources may be used periodically without performing sensing.

[0080] In NR sidelinks, power saving based on random resource selection and partial sensing is specified. Terminal 20 to which partial sensing is applied performs reception and sensing only in specific slots within the sensing window. That is, terminal 20 may perform partial sensing by sensing only a limited number of resources compared to full sensing, and then select resources from the identified resource set. Alternatively, terminal 20 may perform random selection by treating the resources within the resource selection window as an identified resource set without excluding any resources, and then selecting resources from that identified resource set.

[0081] Furthermore, at the time of resource selection, a method that performs random selection and uses sensing information during re-evaluation or preemption checks may be treated as partial sensing or as random selection.

[0082] Furthermore, the following operations 1) and 2) may be applied to sensing. Note that sensing and monitoring may be interchangeable, and at least one of the following may be included in the operation: measurement of received RSRP, acquisition of reserved resource information, and acquisition of priority information.

[0083] 1)Periodic-based partial sensing In a system that performs sensing on only some slots, this operation determines which slots to sense based on the reservation periodicity. The reservation period is a value related to the resource reservation period field. Note that "period" may be replaced with "periodicity".

[0084] 2) Contiguous partial sensing In a system where sensing is performed on only a portion of the slots, the sensing slots are determined based on aperiodic reservations. Note that aperiodic reservations are values ​​related to the time resource assignment field.

[0085] Furthermore, multiple resource allocation methods can be configured for a given resource pool. Additionally, SL-DRX (Discontinuous reception) is supported as a power-saving feature; that is, reception operations are performed only during predetermined time intervals.

[0086] As described above, partial sensing is supported as one of the power saving functions. In a resource pool where partial sensing is configured, terminal 20 may perform the periodic partial sensing described above. Terminal 20 may receive information from base station 10 to configure a resource pool in which partial sensing is configured and periodic reservations are enabled.

[0087] Figure 10 is a diagram illustrating an example of periodic partial sensing. As shown in Figure 10, the Y candidate slots for resource selection are selected from the resource selection window [n+T1, n+T2].

[0088] t y SL Let t be one of the slots included in the Y candidate slots. y-k×Preserve SL This can be used as the target slot for periodic partial sensing, and sensing may be performed on it.

[0089] P reserve This may correspond to all values ​​included in the set sl-ResourceReservePeriodList, which is set or predefined. Alternatively, it may correspond to P, which is limited to a subset of sl-ResourceReservePeriodList. reserve The value of P may be set or predetermined. reserve The sl-ResourceReservePeriodList may also be set for each transmit resource pool in resource allocation mode 2. Additionally, the UE implementation may monitor periods included in the sl-ResourceReservePeriodList other than a limited subset. For example, terminal 20 may additionally monitor opportunities corresponding to P_RSVP_Tx.

[0090] With respect to the k value, terminal 20 may monitor the most recent sensing opportunity in a certain reservation cycle prior to slot n of the resource selection trigger, or prior to the first slot of the Y candidate slots subject to processing time limitations. Terminal 20 may also additionally monitor periodic sensing opportunities corresponding to a set of 1 or more k values. For example, the k value may be set to a value corresponding to the most recent sensing opportunity in a certain reservation cycle prior to slot n of the resource selection trigger, or prior to the first slot of the Y candidate slots subject to processing time limitations, and a value corresponding to the sensing opportunity immediately preceding the most recent sensing opportunity in that reservation cycle.

[0091] As described above, partial sensing is supported as one of the power-saving functions. In a resource pool where partial sensing is configured, terminal 20 may perform the continuous partial sensing described above. Terminal 20 may receive information from base station 10 to configure a resource pool in which partial sensing is configured and aperiodic reservations are enabled.

[0092] Figure 11 is a diagram illustrating an example of continuous partial sensing. As shown in Figure 11, when the trigger for resource selection is slot n, terminal 20 selects a Y candidate slot for resource selection from the resource selection window [n+T1, n+T2]. Figure 11 is an example for the case where Y=7. As shown in Figure 11, the beginning of the Y candidate slot is slot t y1 And the next slot is t y2 And, ..., the end of the candidate slot Y is slot t yY This is how it is written.

[0093] Terminal 20 is in the section [n+T A ,n+T B Sensing is performed at ], n+T B or n+T B After (n+T C Resource selection is performed in the interval [n+T]. Note that the periodic partial sensing described above may be performed additionally. A ,n+T B ] of T A and T B n can be any value. Also, n may be replaced with the index of any of the candidate slots in Y.

[0094] Furthermore, the symbol [ may be replaced with the symbol (and the symbol ] may be replaced with the symbol ). For example, the interval [a,b] is the interval from slot a to slot b, and includes both slot a and slot b. For example, the interval (a,b) is the interval from slot a to slot b, and does not include both slot a and slot b.

[0095] Note that the candidate resources that are the target of resource selection are referred to as Y candidate slots, but all slots in the interval [n+T1, n+T2] may be candidate slots, or some of the slots may be candidate slots.

[0096] Furthermore, inter-terminal coordination has been specified as a method to improve reliability and latency performance. For example, inter-terminal coordination method 1 and inter-terminal coordination method 2, shown below, have been specified. Hereinafter, terminal 20 that transmits coordination information will be referred to as UE-A, and terminal 20 that receives coordination information will be referred to as UE-B.

[0097] Inter-UE coordination method 1) For UE-B to transmit, the preferred resource set and / or non-preferred resource set are sent from UE-A to UE-B. Hereinafter, inter-UE coordination method 1 will also be referred to as IUC scheme 1 (Inter-UE coordination scheme 1).

[0098] Inter-UE coordination method 2) UE-A transmits to UE-B information indicating resources where collisions with other transmissions or receptions are expected and / or where collisions have been detected, based on the SCI received from UE-B. This information may also be transmitted via PSFCH. Hereinafter, inter-UE coordination method 2 will also be referred to as IUC scheme 2 (Inter-UE coordination scheme 2).

[0099] 3GPP Release 16 or Release 17 sidelinks are specified for the following: 1) and 2)

[0100] 1) An environment where only 3GPP terminals exist in the ITS (Intelligent Transport Systems) band. 2) An environment that makes UL resources available to SL in the FR1 (Frequency range 1) and FR2 license bands defined in NR.

[0101] As a sidelink for 3GPP Release 18 and later, the inclusion of unlicensed bands is being considered. Examples include unlicensed bands such as the 5GHz-7GHz band and the 60GHz band.

[0102] Figure 12 shows examples of frequency bands used in wireless communication systems. The 3GPP Release 15 and Release 16 NR specifications consider operating in frequency bands above 52.6 GHz, for example. As shown in Figure 12, the currently defined frequency range (FR) 1 is from 410 MHz to 7.125 GHz, with a Subcarrier Spacing (SCS) of 15, 30, or 60 kHz and a bandwidth from 5 MHz to 100 MHz.

[0103] FR2-1 covers the frequency band from 24.25 GHz to 52.6 GHz, using an SCS of 60, 120, or 240 kHz, with a bandwidth of 50 MHz to 400 MHz. As shown in Figure 12, FR2-2 may be envisioned to cover the range from 52.6 GHz to 71 GHz. Furthermore, support for frequency bands exceeding 71 GHz may also be envisioned.

[0104] When using bandwidths exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0105] Furthermore, in high-frequency bands such as FR2-2, increased inter-carrier phase noise becomes a problem. Therefore, the application of a larger (wider) SCS or single-carrier waveform may be necessary.

[0106] For example, unlicensed bands in the 5GHz-7GHz range could include 5.15GHz to 5.35GHz, 5.47GHz to 5.725GHz, and above 5.925GHz.

[0107] For example, unlicensed bands in the 60GHz band could include those from 59GHz to 66GHz, from 57GHz to 64GHz or 66GHz, and from 59.4GHz to 62.9GHz.

[0108] In unlicensed bands, various regulations are in place to prevent interference with other systems or equipment.

[0109] For example, in the 5GHz-7GHz band, Listen Before Talk (LBT) is performed when accessing a channel. The base station 10 or terminal 20 performs a power detection for a predetermined period immediately before transmission, and if the power exceeds a certain value, i.e., if it detects transmission from another device, it stops transmitting (this may be called an LBT failure). In addition, a Maximum Channel Occupancy Time (MCOT) is defined. MCOT is the maximum time interval during which transmission is allowed to continue if transmission is started after LBT, and in Japan, for example, it is 4ms.

[0110] Furthermore, as an Occupied channel bandwidth (OCB) requirement, when transmitting using a carrier bandwidth, it must use at least X% of that bandwidth. For example, in Europe, it is required to use 80% to 100% of the Nominal channel bandwidth (NCB). The OCB requirement aims to ensure that power detection of channel access is performed correctly.

[0111] Furthermore, regarding the maximum transmit power and maximum power spectral density (PSD), it is stipulated that transmissions must be performed at or below a specified transmit power to avoid excessive interference. For example, in Europe, the maximum transmit power is 23 dBm in the 5150 MHz-5350 MHz band. Also, for example in Europe, the maximum power spectral density is 10 dBm / MHz in the 5150 MHz-5350 MHz band.

[0112] For example, in the 60GHz band, LBT is performed when accessing a channel. The base station 10 or terminal 20 performs power detection for a predetermined period immediately before transmission, and if the power exceeds a certain value, i.e., if it detects transmission from another device, it stops transmitting. Furthermore, it is stipulated that transmission must be performed at or below a predetermined transmit power with respect to maximum transmit power and maximum power spectral density. It is also stipulated that the system must have the capability to meet OCB requirements.

[0113] NR specifies four types of channel access procedures based on differences in the temporal behavior of the LBT (the period during which sensing is performed). Note that this sensing operation is different from the side-link sensing described above, and is described as LBT sensing for distinction.

[0114] Type 1) Variable-time LBT sensing is performed before transmission. Also known as Category 4 LBT. Type 2A) Performs 25μs LBT sensing before transmission. Also known as Category 2 LBT. Type 2B) Performs 16μs LBT sensing before transmission. Also known as Category 2 LBT. Type 2C) Transmission begins without LBT. Similar to transmission on licensed bands.

[0115] FIG. 13 is a diagram for illustrating Example (1) of LBT. FIG. 13 is an example of a Type 1 channel access procedure. Type 1 is further classified into 4 classes indicating Channel access priority class (CAPC) based on the difference in LBT sensing length. LBT sensing is performed in the following two periods.

[0116] The first period is a Prioritization Period or a defer duration, which has a length of 16+9×m p [μs]. m p is defined with a fixed value for each channel access priority class.

[0117] The second period is a backoff procedure, which has a length of 9×N [μs]. The value of N is randomly determined from a certain range (refer to the CWS adjustment procedure in Non-Patent Document 4). N is the initial value of the backoff counter, and the value of the backoff counter decreases by 1 each time the power of a signal from another apparatus is not detected within 9 [μs].

[0118] In the above, the 9 μs LBT sensing period may be referred to as an LBT sensing slot period.

[0119] In the example of FIG. 13, m p =3, and the defer duration is 43 μs. As shown in FIG. 13, the backoff counter is fixed while the channel is busy. Also, as shown in FIG. 13, when the transmissions of the NR-U gNB and the wireless LAN node #2 collide and an error is detected, the Contention Window Size (CWS) of the NR-U gNB is expanded from 3 to 13.

[0120] FIG. 14 is a diagram for explaining Example (2) of LBT. FIG. 14 is an example of a Type 2A or Type 2B channel access procedure that does not involve random backoff. A gap for power detection of 25 μs for Type 2A and 16 μs for Type 2B is set before transmission.

[0121] FIG. 15 is a diagram for explaining Example (3) of LBT. FIG. 15 is an example of a Type 2C channel access procedure. As shown in FIG. 15, power detection is not performed before transmission, and transmission is executed immediately after a gap not exceeding 16 μs. The transmission period may be up to 584 μs.

[0122] As described above, a plurality of LBT types are supported in NR-U. In Type 1 described above, the initial value N of the backoff counter is set to a random number in the range from 0 to CW whose value range is determined based on the channel access priority class p. p Table 1 specifies m for each channel access priority class p in UL. p , CW p minimum value CW p,min , CW p maximum value CW p,max An example is shown below.

[0123] [Table 1]

[0124] As shown in Table 1, m is determined by the channel access priority class p. p , CW p,min , CW p,max is determined. When p is 1, the LBT period calculated from Table 1 ranges from a minimum of 34 μs to a maximum of 88 μs. When p is 2, the LBT period calculated from Table 1 ranges from a minimum of 34 μs to a maximum of 160 μs. When p is 3, the LBT period calculated from Table 1 ranges from a minimum of 43 μs to a maximum of 9286 μs. When p is 4, the LBT period calculated from Table 1 ranges from a minimum of 79 μs to a maximum of 9286 μs. Note that Table 1 is a table used for UL.

[0125] The LBT type and channel access priority class may be determined based on notifications from base station 10, channel type, etc. The 25μs or 16μs gap may be set by the base station 10's scheduling, taking into account TA (Timing Advance) and CP extension.

[0126] LBT applied to channel access is performed every predetermined bandwidth (e.g., 20 MHz). If no power is detected in the LBT channel containing each transmit, the transmit can be performed. On the other hand, each CC in Uu can be defined with a wider bandwidth than the LBT channel. In other words, wideband operation is supported. Uu is the radio interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment).

[0127] Figure 16 is a diagram illustrating an example of broadband operation (1). Figure 17 is a diagram illustrating an example of broadband operation (2). In the case of broadband operation in the unlicensed band, as shown in Figure 16 or Figure 17, when LBT in the gNB is successful on some or all of the LBT channels, transmission may be permitted on the LBT channels where LBT was successful. As shown in Figure 16, the gNB may transmit a single consecutive block, or as shown in Figure 17, the gNB may transmit multiple discontinuous blocks.

[0128] For DL ​​in the unlicensed band, two types of DL are defined: DL Type A, which performs LBT on each channel, and DL Type B, which performs LBT Type 1 on randomly selected channels and LBT Type 2A on the remaining channels.

[0129] DL Type A is further classified into Type A1 and Type A2. In Type A1, the contention window CWp is determined for each channel. In Type A2, the largest CWp among those determined for each channel is used.

[0130] DL Type B is further classified into Type B1 and Type B2. In Type B1, a single CWp is applied to all channels. In Type B2, the largest CWp among those determined for each channel is used.

[0131] If some or all LBT channels in a gNB successfully perform LBT, PDSCH transmission is permitted on the LBT channels where LBT was successful. The gNB may transmit a single block that is consecutive in the frequency direction, or it may transmit multiple blocks that are discontinuous in the frequency direction.

[0132] Figure 18 is a diagram illustrating example (3) of broadband operation. Figure 19 is a diagram illustrating example (4) of broadband operation. As shown in Figure 18 or Figure 19, transmission may be permitted when LBT at the UE is successful on all LBT channels in the scheduled bandwidth. As shown in Figure 19, transmission may not be permitted if LBT fails on some LBT channels.

[0133] For ULs in the unlicensed band, the LBT type is determined by instructions from the gNB. If LBT type 1 is instructed, LBT type 2 is applied if LBT similar to DL type B is performed on the UL immediately before transmission, or LBT type 1 is applied. If LBT fails on any LBT channel for transmission, the UL will not be transmitted on any LBT channel. Note that LBT channels may also be called RB (Resource Block) sets. LBT channels and RB sets may be interchangeable.

[0134] Here, the configuration of the PSFCH in the unlicensed band is given by either A) or B) below, either through configuration or pre-configuration.

[0135] A) A PSFCH consists of one common interlace PRB (hereinafter also referred to as "common PRB") and K3 dedicated PRBs in other interlaces. If the nth PRB of the K3 dedicated PRBs and the mth PRB of the common interlace are within the same 1 MHz band, the mth PRB of the common interlace is dropped and not transmitted. This drop may be due to a PSD (Power spectral density) limit, or the 1 MHz band may be the band to which the PSD limit is applied. K3 is one of {1, 2, 5}. Information is transmitted in the K3 dedicated PRBs. Figure 20 is a diagram illustrating an example (1) of PSFCH transmission in an embodiment of the present invention. Figure 20 shows an example of the PSFCH structure of A).

[0136] B) The PSFCH consists of PRBs of a single interlace. Information is transmitted in all PRBs within that interlace.

[0137] The above A) has superior PSFCH capacity, while the above B) has superior detection performance.

[0138] In the PSFCH configuration described in A) above, the detailed operation when multiple PSFCH transmissions occur simultaneously was unclear. For example, if the individual PRBs for multiple PSFCH transmissions (e.g., PSFCH TX-1 and PSFCH TX-2) within the same RB set are included in the same 1MHz band, it was unclear how the transmission would be performed to satisfy the PSD limit. Also, if multiple PSFCH transmissions (e.g., PSFCH TX-1 and PSFCH TX-2) occur simultaneously within different RB sets, it was unclear whether or not the intracell guard band would be used.

[0139] Prior to the simultaneous occurrence of multiple PSFCH transmissions, terminal 20 may have received multiple PSSCHs corresponding to those multiple PSFCHs, or multiple transport blocks. These multiple PSSCHs or transport blocks may be transmitted from the same terminal 20 or from different terminals 20.

[0140] Therefore, in the PSFCH configuration described in A) above, if multiple PSFCH transmissions occur simultaneously, operations 1) and / or 2) may be executed. For simplicity of explanation, PSFCH TX-1 (PSFCH transmission-1) and PSFCH TX-2 (PSFCH transmission-2) will be described below as examples. However, there may be three or more PSFCHs. For example, if PSFCH TX-A and PSFCH TX-B use resources in the same RB set, and PSFCH TX-C uses resources in a different RB set, operations 1) and 2) may be applied simultaneously.

[0141] Operation 1) If PSFCH TX-1 and PSFCH TX-2 use resources in the same RB set, and some individual PRBs in PSFCH TX-1 and some individual PRBs in PSFCH TX-2 are included in the same 1 MHz band, then the following a)-g) may be performed.

[0142] a) Prioritize the PSFCH with higher priority (i.e., a lower priority value) and drop the individual PRBs in the other PSFCH, or reduce the transmission power. Figure 21 is a diagram illustrating an example (2) of PSFCH transmission in an embodiment of the present invention. As shown in Figure 21, if PSFCH TX-1 has a higher priority than PSFCH-TX2, the individual PRBs of PSFCH-TX2 may be dropped. Note that the determination of whether or not to drop some of the common interlace PRBs may be performed before or after a).

[0143] b) Prioritize the PSFCH with higher priority (i.e., a lower priority value) and drop the other PSFCH, or reduce its transmit power. Note that the decision of whether or not to drop some of the common interlaced PRBs may be made before or after b).

[0144] c) The individual PRBs related to both PSFCHs may be dropped, or the transmit power may be reduced.

[0145] d) Both PSFCHs may be dropped, or the transmit power may be reduced.

[0146] e) The application may operate in a manner that satisfies the PSD limit. The specific operation may be determined by the UE implementation.

[0147] f) If PSFCH TX-1 and PSFCH TX-2 use resources in the same RB set, and some individual PRBs in PSFCH TX-1 and some individual PRBs in PSFCH TX-2 are included in the same 1MHz band, it may be assumed that this will not occur. For example, this occurrence may be avoided by configuration or pre-configuration.

[0148] g) The PSSCH transmitting UE (the UE planning to transmit PSFCH TX-1 and PSFCH TX-2) does not have to select PSSCH resources such that PSFCH TX-1 and PSFCH TX-2 use resources in the same RB set, and several individual PRBs in PSFCH TX-1 and several individual PRBs in PSFCH TX-2 are included in the same 1 MHz band, or the PSSCH transmitting UE may exclude such PSSCH resources from the candidates.

[0149] As described in operation 1), it is possible to operate in a way that satisfies the PSD limit when transmitting multiple PSFCHs.

[0150] Operation 2) When PSFCH TX-1 and PSFCH TX-2 use resources in different RB sets, at least one of the following a)-c) may be applied to the operation of the intracell guard band PRB.

[0151] a) Figure 22 is a diagram illustrating an example (3) of PSFCH transmission in an embodiment of the present invention. As shown in Figure 22, assuming that the interlace index of the PRB for common interlacing is the same between RB sets, PSFCH TX-1 and PSFCH TX-2 may be transmitted simultaneously using the PRB of the interlace index in the intracell guard band. Alternatively, PSFCH TX-1 and PSFCH TX-2 may be transmitted simultaneously without using the PRB in the intracell guard band.

[0152] b) Assuming that the interlace indices of the common interlace PRBs may differ between RB sets, PSFCH TX-1 and PSFCH TX-2 may be transmitted simultaneously using the intracell guard band PRB relating to the interlace index of the common interlace PRB of at least one of the RB sets. Alternatively, PSFCH TX-1 and PSFCH TX-2 may be transmitted simultaneously without using the intracell guard band PRB.

[0153] c) When using an intracell guard band PRB, the PRB may be treated as a common interlaced PRB, and if it is within the same 1 MHz bandwidth as an individual PRB, the PRB may be dropped.

[0154] Furthermore, in operation 2), it is not necessary to apply the operation of dropping the common interlaced PRB in the same 1MHz bandwidth as the individual PRB. Also, in operation 2), whether or not to apply the operation of dropping the common interlaced PRB in the same 1MHz bandwidth as the individual PRB may be determined based on whether or not the PSD limit is met without applying the operation.

[0155] In addition, in operation 2), continuous or a series of cyclic shift hopping may be applied between the RB sets, and if an intracell guard band PRB is used, continuous or a series of cyclic shift hopping may also be applied to the PRB between the RB sets.

[0156] As described in operation 2), when PSFCH TX-1 and PSFCH TX-2 use resources in different RB sets, the UE operation related to simultaneous transmission can be determined, enabling efficient communication.

[0157] Although the above embodiment uses a conventional SL channel and SL signal configuration, it is not limited to this. For example, this embodiment may also be applied when an interlaced channel is used as a configuration to satisfy the OCB requirements.

[0158] The above-described embodiment may be applied only when certain conditions are met. For example, it may be applied in relation to a predetermined SL channel or SL signal. For example, this embodiment may be applied to any of PSCCH / PSSCH, PSFCH, S-SSB, or SL positioning RS. For example, it may be applied based on a predetermined setting or pre-configuration. For example, this embodiment may be applied when "enabling" this embodiment is given in the resource pool by setting or pre-configuration. For example, this embodiment may not be applied if the LBT method for the second SL transmission is not or no longer is of type 1.

[0159] In addition, to apply LBT type 2A, 2B, or 2C, an additional transmission (additional TX), such as a CP extension, may be performed immediately before transmission P.

[0160] The applicability of this embodiment and the UE capabilities related to its operation may be defined and reported to the base station 10 and / or terminal 20, or they may not be reported.

[0161] The UE's SL transmission may be PSCCH, PSSCH, PSFCH, S-SSB, or SL-PRS, and different channels or signals may be applied to each operation in this embodiment.

[0162] Furthermore, at least one of the UE's SL transmissions may be an UL transmission.

[0163] This embodiment may be applied to resource selection, resource re-selection, re-evaluation, or preemption checks.

[0164] Furthermore, the method in the embodiment of the present invention is not limited to the case of direct communication between terminals as described above, but may be applied to other similar cases.

[0165] The above-described embodiment is not limited to V2X terminals, but may also be applied to terminals that perform D2D communication.

[0166] The above embodiment allows for operation that satisfies the PSD limit when multiple PSFCH transmissions occur. Furthermore, it enables efficient communication by determining the UE operation related to simultaneous transmission when PSFCH transmission 1 and PSFCH transmission 2 use resources in different RB sets.

[0167] In other words, it is possible to determine the behavior when multiple HARQ (Hybrid automatic repeat request) feedbacks occur in the unlicensed band.

[0168] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to implement the embodiments described above. However, the base station 10 and terminal 20 may each have only some of the functions in the embodiments.

[0169] <Base station 10> Figure 23 is a diagram showing an example of the functional configuration of the base station 10. As shown in Figure 23, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 23 is merely an example. Any functional classification and functional unit names are acceptable as long as they enable the operation according to the embodiment of the present invention.

[0170] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, information from a higher layer. The transmitting unit 110 also has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL reference signals, etc. to the terminal 20.

[0171] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads it from the storage device as needed. The contents of the setting information include, for example, information related to D2D communication settings.

[0172] As described in the embodiment, the control unit 140 performs processing related to the settings for the terminal 20 to perform D2D communication. The control unit 140 also transmits the scheduling of D2D communication and DL communication to the terminal 20 via the transmission unit 110. The control unit 140 also receives information related to the HARQ response of D2D communication and DL communication from the terminal 20 via the reception unit 120. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120.

[0173] <Terminal 20> Figure 24 is a diagram showing an example of the functional configuration of terminal 20. As shown in Figure 24, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 24 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention.

[0174] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and acquires signals from higher layers from the received physical layer signals. The receiving unit 220 also has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals or reference signals transmitted from the base station 10. For example, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc., to other terminals 20 as D2D communication, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0175] The setting unit 230 stores various setting information received from the base station 10 or terminal 20 by the receiving unit 220 in its storage device and reads it from the storage device as needed. The setting unit 230 also stores pre-configured setting information. The content of the setting information is, for example, information related to D2D communication settings.

[0176] As described in the embodiment, the control unit 240 controls D2D communication to establish an RRC connection with other terminals 20. The control unit 240 also performs power-saving operations. The control unit 240 also performs HARQ processing for D2D communication and DL communication. The control unit 240 transmits information related to the HARQ response for D2D communication and DL communication scheduled from the base station 10 to the base station 10. The control unit 240 may also schedule D2D communication with other terminals 20. The control unit 240 may autonomously select resources to be used for D2D communication from a resource selection window based on the sidelink sensing results, or it may perform re-evaluation or preemption. The control unit 240 also performs power-saving processing in the transmission and reception of D2D communication. The control unit 240 also performs processing related to inter-terminal coordination in D2D communication. The control unit 240 also performs LBT processing in D2D communication. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220.

[0177] (Hardware configuration) The block diagrams (Figures 23 and 24) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the one or more devices with software.

[0178] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0179] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 25 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0180] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0181] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0182] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0183] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes a computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 23 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 24 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0184] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0185] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0186] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0187] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0188] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0189] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0190] Figure 26 shows an example of the configuration of vehicle 2001. As shown in Figure 26, vehicle 2001 comprises a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, to the communication module 2013.

[0191] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0192] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0193] Signals from various sensors 2021-2029 include current signals from current sensor 2021 which senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, front and rear wheel air pressure signals obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depression signals obtained by accelerator pedal sensor 2029, brake pedal depression signals obtained by brake pedal sensor 2026, shift lever operation signals obtained by shift lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0194] The Information Services Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001. The Information Services Unit 2012 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0195] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0196] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 to the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0197] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0198] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0199] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also be called an output unit, which outputs information (for example, outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from the external device in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., provided in the vehicle 2001.

[0200] (Summary of the embodiments) As described above, according to an embodiment of the present invention, a terminal is provided having a receiving unit that receives a first transport block and a second transport block from another terminal in the unlicensed band, a control unit that determines whether or not to transmit a first feedback channel corresponding to the first transport block and a second feedback channel corresponding to the second transport block, and a transmitting unit that transmits the feedback channels that have been determined to be transmitted to the other terminal.

[0201] The above configuration allows for operation that satisfies the PSD limit when multiple PSFCH transmissions occur. Furthermore, it enables efficient communication by determining the UE operation related to simultaneous transmission when PSFCH transmission 1 and PSFCH transmission 2 use resources in different RB sets. In other words, it enables the operation to be determined when multiple HARQ (Hybrid automatic repeat request) feedbacks occur in the unlicensed band.

[0202] The control unit may drop either the first or second feedback channel or reduce the transmission power if the first and second feedback channels are transmitted using resources in the same Resource Block (RB) set, and the resources of the first and second feedback channels are located within the bandwidth to which the Power spectral density (PSD) limit applies. This configuration allows the system to operate in a way that satisfies the PSD limit when transmitting multiple PSFCHs.

[0203] The control unit may, when the first feedback channel and the second feedback channel are transmitted using resources in the same Resource Block (RB) set, and when the resources of the first feedback channel and the resources of the second feedback channel are located within the bandwidth to which the Power spectral density (PSD) limit is applied, drop the feedback channel with the lower priority among the first and second feedback channels, or reduce the transmission power. This configuration allows the unit to operate in a way that satisfies the PSD limit when transmitting multiple PSFCHs.

[0204] When the first feedback channel and the second feedback channel transmit using resources in the same Resource Block (RB) set, the control unit does not need to select resources such that the resources of the first feedback channel and the resources of the second feedback channel are located within the bandwidth to which the Power spectral density (PSD) limit is applied. This configuration allows the unit to operate in a way that satisfies the PSD limit when transmitting multiple PSFCHs.

[0205] The control unit may, when the first feedback channel and the second feedback channel are transmitted using resources in different RB (Resource Block) sets, assume that the interlace index of the common interlace PRB (Physical Resource Block) between the different RB sets is the same, and the transmission unit may use the PRB of the interlace index of the intracell guard band between the different RB sets to transmit the first feedback channel and the second feedback channel to the other terminal. This configuration allows for the determination of the UE operation related to simultaneous transmission when PSFCH transmission 1 and PSFCH transmission 2 use resources in different RB sets, and enables efficient communication.

[0206] Furthermore, according to an embodiment of the present invention, a communication method is provided in which a terminal performs the following steps in an unlicensed band: receiving a first transport block and a second transport block from another terminal; deciding whether or not to transmit a first feedback channel corresponding to the first transport block and a second feedback channel corresponding to the second transport block; and transmitting the feedback channels that have been decided to be transmitted to the other terminal.

[0207] The above configuration allows for operation that satisfies the PSD limit when multiple PSFCH transmissions occur. Furthermore, it enables efficient communication by determining the UE operation related to simultaneous transmission when PSFCH transmission 1 and PSFCH transmission 2 use resources in different RB sets. In other words, it enables the operation to be determined when multiple HARQ (Hybrid automatic repeat request) feedbacks occur in the unlicensed band.

[0208] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0209] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0210] Each aspect / embodiment described in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), and IEEE This may apply to at least one system utilizing 802.20, UWB (Ultra-WideBand), Bluetooth®, or other appropriate systems, and to next-generation systems extended, modified, created, or defined based thereon. It may also apply to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

[0211] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0212] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0213] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0214] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0215] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0216] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0217] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0218] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0219] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0220] The terms “system” and “network” as used in this disclosure are interchangeable.

[0221] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or corresponding other information. For example, wireless resources may be indicated by an index.

[0222] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0223] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0224] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0225] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform information-based control or operation.

[0226] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0227] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0228] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0229] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0230] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0231] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0232] The terms "connected", "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electric wires, cables and printed electrical connections, as well as, as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region and optical (both visible and invisible) region, etc.

[0233] The reference signal may also be abbreviated as RS (Reference Signal), and may be referred to as a pilot according to the applicable standard.

[0234] The recitation "based on" as used in the present disclosure does not mean "based only on", unless explicitly specified otherwise. In other words, the recitation "based on" means both "based only on" and "based at least on".

[0235] Any reference to an element using designations such as "first", "second" and the like used in the present disclosure does not generally limit the quantity or order of those elements. These designations may be used in the present disclosure as a convenient method of distinguishing between two or more elements. Accordingly, reference to first and second elements does not mean that only two elements may be employed, or that the first element must precede the second element in any manner.

[0236] The "means" in the configuration of each of the above apparatuses may be replaced with "unit", "circuit", "device", or the like.

[0237] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0238] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0239] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0240] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurology.

[0241] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0242] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0243] For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0244] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal 20 to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal 20) in TTI units. However, the definition of TTI is not limited to this.

[0245] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0246] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0247] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0248] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0249] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0250] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0251] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0252] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0253] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0254] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0255] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0256] The structures such as the radio frame, subframe, slot, minislot, and symbol described above are merely examples. For example, configurations such as the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, symbol length, and cyclic prefix (CP: Cyclic Prefix) length can be variously modified.

[0257] In the present disclosure, when articles are added by translation, such as "a", "an" and "the" in English, the present disclosure may include that the nouns following these articles are in plural form.

[0258] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted in the same manner as "different".

[0259] Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching in accordance with execution. Further, notification of predetermined information (for example, notification of "being X") is not limited to being performed explicitly, and may be performed implicitly (for example, by not transmitting the notification of the predetermined information).

[0260] The present disclosure has been described in detail above, but it is apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modified and altered aspects without departing from the spirit and scope of the present disclosure defined by the description of the claims. Accordingly, the description of the present disclosure is for the purpose of illustrative explanation, and does not have any limiting meaning to the present disclosure. [Description of Symbols]

[0261] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Front Wheel 2008 Rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication port (I / O port)

Claims

1. In the unlicensed band, a receiving unit receives a first transport block and a second transport block from another terminal, A control unit that determines whether or not to transmit a first feedback channel corresponding to the first transport block and a second feedback channel corresponding to the second transport block, A terminal having a transmitting unit that transmits a feedback channel that has been decided to transmit to the other terminal.

2. The terminal according to claim 1, wherein the control unit drops either the first feedback channel or the second feedback channel or reduces the transmission power when the first feedback channel and the second feedback channel are transmitted using resources in the same Resource Block (RB) set, and the resources of the first feedback channel and the resources of the second feedback channel are located within the bandwidth to which the Power spectral density (PSD) limit is applied.

3. The terminal according to claim 1, wherein the control unit drops the lower priority feedback channel or reduces the transmission power of the first feedback channel or the second feedback channel when the first feedback channel and the second feedback channel are transmitted using resources in the same Resource Block (RB) set, and the resources of the first feedback channel and the resources of the second feedback channel are located within the bandwidth to which the Power spectral density (PSD) limit is applied.

4. The terminal according to claim 1, wherein, when the first feedback channel and the second feedback channel are transmitted using resources in the same Resource Block (RB) set, the control unit does not select resources such that the resources of the first feedback channel and the resources of the second feedback channel are located within the bandwidth to which the Power spectral density (PSD) limit is applied.

5. The control unit assumes that when the first feedback channel and the second feedback channel transmit using resources in different sets of Resource Blocks (RBs), the interlace index of the Physical Resource Block (PRB) with common interlacing is the same between the different sets of RBs. The terminal according to claim 1, wherein the transmitting unit transmits the first feedback channel and the second feedback channel to the other terminal using the PRB of the interlace index of the intracell guard band between the different RB sets.

6. In the unlicensed band, a procedure for receiving a first transport block and a second transport block from another terminal, A procedure for determining whether or not to transmit a first feedback channel corresponding to the first transport block and a second feedback channel corresponding to the second transport block, A communication method in which a terminal performs the procedure of sending a feedback channel that it has decided to transmit to the other terminal.

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