Wireless communication method and terminal equipment

Abstract

The invention provides a wireless communication method and terminal equipment. The method comprises: a terminal device determines a first policy related to a continuous listen before talk (LBT) failure, the detection of the continuous LBT failure being related to a resource granularity;

Description

[0001] Cross-references This application is a divisional application of Chinese Patent Application No. 202380094798.8, entitled "Wireless Communication Method and Terminal Equipment", which entered the Chinese national phase of PCT international patent application PCT / CN2023 / 084122 filed on March 27, 2023. All of the above patent applications are incorporated herein by reference in their entirety. Technical Field

[0002] This application relates to the field of communication technology, and more specifically, to a wireless communication method and terminal device. Background Technology

[0003] On unlicensed spectrum, terminal devices can transmit signals based on the listen-before-talk (LBT) principle. If the channel listening result indicates that the channel is idle, the terminal device can use the unlicensed spectrum channel to transmit signals; if the channel listening result indicates that the channel is busy, the terminal device is generally not allowed to use the unlicensed spectrum channel to transmit signals.

[0004] For side-by-side communication scenarios, enhanced considerations have been introduced to address consecutive LBT failures. However, details regarding consecutive LBT failures are currently not clearly defined. Summary of the Invention

[0005] This application provides a wireless communication method and a terminal device. The following provides a detailed description of several aspects covered by this application.

[0006] In a first aspect, a wireless communication method is provided, comprising: a terminal device determining a first strategy related to consecutive LBT failures, wherein the detection of consecutive LBT failures is related to resource granularity.

[0007] In a second aspect, a terminal device is provided, comprising: a determining unit, configured to determine a first strategy related to consecutive LBT failures, wherein the detection of consecutive LBT failures is related to resource granularity.

[0008] Thirdly, a terminal device is provided, including a memory and a processor, wherein the memory is used to store a program, and the processor is used to invoke the program in the memory to execute the method as described in the first aspect.

[0009] Fourthly, an apparatus is provided, including a processor for calling a program from memory to perform the method described in the first aspect.

[0010] Fifthly, a chip is provided, including a processor for calling a program from memory, causing a device having the chip mounted to perform the method described in the first aspect.

[0011] In a sixth aspect, a computer-readable storage medium is provided, having stored thereon a program, which causes a computer to execute the method of the first aspect.

[0012] In a seventh aspect, a computer program product is provided, comprising a program, which causes a computer to execute the method of the first aspect.

[0013] In an eighth aspect, a computer program is provided, which causes a computer to execute the method of the first aspect.

[0014] When detecting continuous LBT failure, the application considers information related to resource granularity, and then determines a strategy related to continuous LBT, thereby providing an explicit solution for the terminal device to perform an operation related to continuous LBT failure. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A system architecture example diagram of a wireless communication system to which the embodiments of the application can be applied is shown.

[0016] Figure 2 A scenario example diagram of in-network coverage sidelink communication is shown.

[0017] Figure 3 A scenario example diagram of partial network coverage sidelink communication is shown.

[0018] Figure 4 A scenario example diagram of out-of-network coverage sidelink communication is shown.

[0019] Figure 5 A schematic diagram of a listen-based resource selection method in a sidelink communication system is shown.

[0020] Figure 6 An example diagram of a broadcast-based sidelink communication method is shown.

[0021] Figure 7 An example diagram of a unicast-based sidelink communication method is shown.

[0022] Figure 8 An example diagram of a groupcast-based sidelink communication method is shown.

[0023] Figure 9 A schematic diagram of the correspondence between different resources involved in the application is shown.

[0024] Figure 10 A flowchart of a wireless communication method provided by the embodiments of the application is shown.

[0025] Figure 11 A flowchart of a communication method provided by the embodiments of the application, in which continuous LBT failure occurs on a RB set, and the resource switching strategy is to switch resource pools, is shown.

[0026] Figure 12 is a flowchart of a communication method with a resource switching strategy of switching a resource pool, according to an embodiment of the present application.

[0027] Figure 13 is a flowchart of a communication method with a resource switching strategy of switching a resource pool, according to an embodiment of the present application.

[0028] Figure 14 is a schematic block diagram of a terminal device, according to an embodiment of the present application.

[0029] Figure 15 is a schematic structural diagram of an apparatus, according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0031] Communication system architecture Figure 1 is a system architecture example diagram of a wireless communication system 100 to which embodiments of the present application can be applied. The wireless communication system 100 can include a network device 110 and a terminal device 120. The network device 110 can be a device that communicates with the terminal device 120. The network device 110 can provide communication coverage for a specific geographic area and can communicate with the terminal device 120 located in the coverage area.

[0032] Figure 1 Exemplarily, one network device and one terminal device are shown. Alternatively, the wireless communication system 100 can include one or more network devices 110 and / or one or more terminal devices 120. For one network device 110, the one or more terminal devices 120 can all be located within the network coverage of the network device 110, all be located outside the network coverage of the network device 110, or part be located within the coverage of the network device 110 and part be located outside the network coverage of the network device 110, which is not limited in the embodiments of the present application.

[0033] Alternatively, the wireless communication system 100 can further include a network controller, a mobile management entity, and other network entities, which are not limited in the embodiments of the present application.

[0034] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a 5th generation (5G) system or new radio (NR), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, and the like. The technical solutions provided in the present application can also be applied to future communication systems, such as a 6th generation mobile communication system, a satellite communication system, and the like.

[0035] The terminal device in the embodiments of the present application can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal device, a mobile device, a user terminal, a wireless communication device, a user agent, or a user apparatus. The terminal device in the embodiments of the present application can refer to a device that provides voice and / or data connectivity for a user, and can be used to connect people, things, and machines, such as handheld devices with wireless connection functions, vehicle-mounted devices, and the like. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer (Pad), a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, and the like. For example, the terminal device can act as a scheduling entity, which provides sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communication, and the like. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and the smart home device communicate with each other without relaying the communication signals through the base station. Alternatively, the terminal device can be used to act as a base station.

[0036] The network device in the embodiments of the present application can be a device for communicating with a terminal device, and the network device can also be referred to as an access network device or a radio access network device, for example, the network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) for accessing a terminal device to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, auxiliary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip used in the foregoing devices or apparatuses. The base station can also be a mobile switching center and a device assuming a base station function in device-to-device (D2D), V2X, machine-to-machine (M2M) communication, a network side device in a 6G network, a device assuming a base station function in a future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0037] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or a drone can be configured to act as a device communicating with another base station.

[0038] In some deployments, the network device in the embodiments of the present application can refer to a CU or a DU, or the network device includes a CU and a DU. The gNB can also include an AAU.

[0039] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed on airplanes, balloons and satellites in the air. The scene in which the network device and the terminal device are located is not limited in the embodiments of the present application.

[0040] V2X in different network coverage The sidelink communication refers to a communication technology based on a sidelink. The sidelink communication can be, for example, device to device (D2D) or vehicle to everything (V2X) communication. In a conventional cellular system, communication data is received or transmitted between a terminal device and a network device, while the sidelink communication supports direct communication data transmission between terminal devices. Compared with the conventional cellular communication, the direct communication data transmission between terminal devices can have higher spectrum efficiency and lower transmission delay. For example, the vehicle to everything system adopts the sidelink communication technology.

[0041] In the sidelink communication, according to the network coverage in which the terminal device is located, the sidelink communication can be divided into in-network coverage sidelink communication, partial network coverage sidelink communication and out-of-network coverage sidelink communication.

[0042] Figure 2 An example diagram of a scenario of the in-network coverage sidelink communication is shown in FIG. 1. Figure 2 In the scenario shown in FIG. 1, two terminal devices 120a are both in the coverage range of a network device 110. Therefore, the two terminal devices 120a can both receive the configuration signaling (the configuration signaling in the present application can also be replaced by configuration information) of the network device 110, and determine the sidelink configuration according to the configuration signaling of the network device 110. After the two terminal devices 120a are both configured, the sidelink communication can be performed on the sidelink.

[0043] Figure 3 An example diagram of a scenario of the partial network coverage sidelink communication is shown in FIG. 2. Figure 3In the illustrated scenario, the terminal device 120a performs sidelink communication with the terminal device 120b. The terminal device 120a is located in the coverage of the network device 110, and thus the terminal device 120a can receive the configuration signaling of the network device 110 and determine the sidelink configuration according to the configuration signaling of the network device 110. The terminal device 120b is located out of the network coverage, and thus the terminal device 120b cannot receive the configuration signaling of the network device 110. In this case, the terminal device 120b can determine the sidelink configuration according to the pre-configuration information and / or the information carried in the physical sidelink broadcast channel (PSBCH) sent by the terminal device 120a located in the network coverage. After the terminal device 120a and the terminal device 120b both perform sidelink configuration, the sidelink communication can be performed on the sidelink.

[0044] Figure 4 An example diagram of a scenario of sidelink communication out of network coverage is shown. In the illustrated scenario, the terminal device 120a is located in the coverage of the network device 110, and the terminal device 120b is located out of the network coverage. In this case, the terminal device 120a can receive the configuration signaling of the network device 110 and determine the sidelink configuration according to the configuration signaling of the network device 110. The terminal device 120b cannot receive the configuration signaling of the network device 110, and thus the terminal device 120b can determine the sidelink configuration according to the pre-configuration information and / or the information carried in the PSBCH sent by the terminal device 120a located in the network coverage. After the terminal device 120a and the terminal device 120b both perform sidelink configuration, the sidelink communication can be performed on the sidelink. Figure 4 In the illustrated scenario, the two terminal devices 120b are both located out of the network coverage. In this case, the two terminal devices 120b can both determine the sidelink configuration according to the pre-configuration information. After the two terminal devices 120b both perform sidelink configuration, the sidelink communication can be performed on the sidelink.

[0045] Research on different stages of D2D In the 3GPP communication protocol, D2D is studied in different stages, which is illustrated below.

[0046] Device-to-device communication in Rel-12 / 13 is mainly studied for proximity services (ProSe), which mainly targets public safety services. In ProSe, the location of the resource pool in the time domain is configured (for example, the resource pool is non-continuous in the time domain), so that the terminal device discontinuously transmits or receives data on the sidelink, thereby achieving power saving effect.

[0047] In Rel-14 / 15, the V2X system mainly studies the scenario of vehicle-to-vehicle communication, which mainly targets the high-speed vehicle-to-vehicle and vehicle-to-person communication services. In V2X, since the vehicle-mounted system has continuous power supply, power efficiency is not the main problem, and the delay of data transmission is the main problem. Therefore, the terminal device is required to continuously transmit and receive in the system design.

[0048] Rel-14 investigated scenarios where wearable devices access the network via mobile phones, primarily targeting low-mobility and low-power access conditions. Further enhancements in device-to-device (FeD2D) were studied during the preliminary research phase, concluding that base stations can configure discontinuous reception (DRX) parameters for remote terminals via a relay terminal. However, since this research has not yet entered the standardization stage, the specific details of DRX configuration remain unresolved.

[0049] Mode of sidelink communication (LTE D2D / V2X) Some standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two modes of side-by-side communication: mode 1 and mode 2.

[0050] In the first mode, the resources of the terminal device (resources mentioned in this application may also be referred to as transmission resources, such as time-frequency resources) are allocated by the network device. The terminal device can transmit data on the side link according to the resources allocated by the network device. The network device can allocate resources for a single transmission or resources for semi-static transmission to the terminal device. This first mode can be applied to scenarios with network device coverage, as described above. Figure 2 The scene shown. In Figure 2 In the scenario shown, terminal device 120a is located within the network coverage area of ​​network device 110, so network device 110 can allocate resources used by terminal device 120a during side-by-side transmission.

[0051] In the second mode, the terminal device can autonomously select one or more resources from the resource pool (RP). Then, the terminal device can perform sideline transmission based on the selected resources. For example, in... Figure 4 In the scenario shown, terminal device 120b is located outside the cell coverage area. Therefore, terminal device 120b can autonomously select resources from the pre-configured resource pool for sideline transmission. Alternatively, in Figure 2 In the scenario shown, terminal device 120a can also autonomously select one or more resources from the resource pool configured in network device 110 for side-by-side transmission.

[0052] NR V2X LTE V2X mainly studies broadcast scenarios, and NR V2X further extends to unicast and groupcast scenarios on the basis of LTE V2X. That is, the application scenarios of NR V2X include broadcast, unicast and groupcast. NR studies the application of V2X in these scenarios.

[0053] Similar to LTE V2X, NR V2X also defines two resource authorization modes. In addition, the terminal device can be in a hybrid mode, that is, it can use the first mode to obtain resources and at the same time use the second mode to obtain resources. The resource acquisition of the terminal device can be indicated by the way of sidelink authorization, that is, the sidelink authorization indicates the time-frequency location of the corresponding physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) resources.

[0054] Unlike LTE V2X, in addition to no feedback, terminal device self-initiated hybrid automatic repeat request (HARQ) retransmission, NR V2X introduces feedback-based HARQ retransmission. This feedback-based HARQ retransmission method is not limited to unicast communication, but also applies to groupcast communication.

[0055] Similar to LTE V2X, in NR V2X, since the vehicle-mounted system has continuous power supply, power efficiency is not a major problem, and the delay of data transmission is a major problem, so the terminal device is required to continuously transmit and receive in the system design.

[0056] Resource selection method of NR V2X in the second mode In NR V2X, some new features are introduced, such as support for a large number of aperiodic services, an increase in the number of retransmissions, and more flexible resource reservation periods. These features have a great impact on the mode of terminal device autonomous resource selection. In the second mode, the terminal device can select resources in the resource pool that are not reserved by other terminal devices or are reserved by other terminal devices but have low received power by decoding the sidelink control information (SCI) sent by other terminal devices and measuring the received power of the sidelink.

[0057] In some implementations, the terminal device can implement the resource allocation scheme in the second mode by the following steps 1 and step 2.

[0058] Step 1: The terminal device selects all available resources in the resource selection window as a resource set A. Specifically, it can be divided into case 1-1 and case 1-2.

[0059] In case 1-1, if the terminal device does not listen in some slots in the listening window, all resources on the corresponding slots in the selection window are excluded. In some implementations, the terminal device can determine the slots in the listening window that are not listened to in the selection window based on the value set of the resource reservation period field in the used resource pool configuration.

[0060] In case 1-2, if the terminal device listens to the PSCCH in the listening window, it measures the reference signal received power (RSRP) of the PSCCH or the RSRP of the PSSCH scheduled by the PSCCH. If the measured RSRP is greater than the sidelink reference signal received power (SL-RSRP) threshold, and according to the resource reservation information in the sidelink control information transmitted in the PSCCH, it is determined that the reserved resources are in the resource selection window, the corresponding resources are excluded from set A. If the remaining resources in the resource set A are less than X% of all resources before the resource exclusion of the resource set A, the SL-RSRP threshold is raised by 3dB, and step 1 is re-executed. In some implementations, the possible values of X can be {20, 35, 50}, and the terminal device can determine the parameter X from the value set according to the priority of the data to be transmitted. Compared with the fixed value of X% as 20% in LTE V2X, the value of X% in NR V2X is more flexible. The value of X% in NR V2X can be configured by the network device or can be preconfigured. In some implementations, the value of X% can be calculated in units of resource pools.

[0061] In addition, the above-mentioned SL-RSRP threshold is related to the priority carried in the PSCCH listened to by the terminal and the priority of the data to be transmitted by the terminal device. The terminal device selects the remaining resources in set A after resource exclusion as a candidate resource set.

[0062] Step 2: The terminal device randomly selects a number of resources from the candidate resource set as the transmission resources for its initial transmission and retransmission. In some implementations, the terminal device can randomly select one or more transmission resources in the resource set A with equal probability. It should be noted that the terminal device needs to meet one or more of the following two conditions when selecting multiple transmission resources.

[0063] Condition 1: After removing certain exceptions, the terminal device may ensure that a selected retransmission resource is supported by the previously sent first-order SCI indication. These exceptions include one or more of the following: Case 1: After resource exclusion, the terminal device cannot select a resource from resource set A that satisfies the time-domain constraint; Case 2: Due to resource preemption, congestion control, or conflicts with uplink services, the terminal device abandons transmission, resulting in a retransmission resource lacking the previously sent first-order SCI indication.

[0064] Condition 2: For any two selected time-frequency resources, the terminal device should ensure that: if the preceding transmission resource requires HARQ feedback, the two resources are at least time-intervaled by a duration of Z. When selecting resources, if resources that meet this time-domain constraint cannot be selected (e.g., when the PDB is short but the number of retransmissions is high), the terminal device can choose to forgo selecting certain retransmission resources or activate HARQ feedback for only a few transmissions. The specific scheme adopted by the terminal device depends on its implementation.

[0065] Resource selection method based on listening See Figure 5 Terminal devices can trigger resource selection or reselection in time slot n. In some implementations, time slot n can be the time slot in which a higher layer triggers the physical layer to report a set of candidate resources. The resource selection window starts from n+T1 and ends at n+T2, denoted as [n+T1, n+T2]. Where 0 <= T1 <= T proc,1 When the subcarrier spacing is 15, 30, 60, 120 kHz, T proc,1 There are 3, 5, 9, and 17 time slots. T 2min <= T2 <= the remaining latency budget of the service, T 2min The set of possible values ​​is {1, 5, 10, 20}*2 µ There are several time slots, where µ = 0, 1, 2, 3 correspond to subcarrier spacings of 15, 30, 60, and 120 kHz, respectively. The terminal device determines T from this set of values ​​based on the priority of its data to be transmitted. 2min For example, when the subcarrier spacing is 15kHz, the terminal device determines T from the set {1, 5, 10, 20} based on the priority of its data to be transmitted. 2min When T 2min When T2 is greater than or equal to the remaining latency budget of the service, then T2 equals the remaining latency budget of the service. The remaining latency budget is the difference between the required latency of the data at the corresponding time and the current time. For example, if a data packet arrives in time slot n with a latency requirement of 50 milliseconds, assuming a time slot is 1 millisecond, if the current time is time slot n, then the remaining latency budget is 50 milliseconds; if the current time is time slot n+20, then the remaining latency budget is 30 milliseconds.

[0066] Before resource selection, the terminal device needs to perform resource listening in the listening window of n-T proc,0 0 is 100 or 1100 milliseconds. When the subcarrier spacing is 15 kHz, 30 kHz, 60 kHz, and 120 kHz, T proc,0 0 is 1, 1, 2, and 4 slots. Generally, the terminal device listens to the SCI sent by other terminal devices in each slot (except for its own sending slot). If the resource selection or reselection is triggered in slot n, the terminal device can use the result of resource listening from n-T proc,0 0 to n-T tatal .

[0067] Step a, the terminal device (such as the physical layer of the terminal device) excludes resources unsuitable for sidelink transmission from the resource selection window according to the channel listening result.

[0068] The terminal device takes all candidate available resources belonging to the resource pool of the terminal device in the resource selection window as a resource set A. Any one resource in set A can be denoted as R(x, y), x and y respectively indicate the frequency domain position and time domain position of the resource. In addition, the initial number of resources in set A is denoted as M tatal .

[0069] The specific listening mode of the terminal device can be divided into two cases a-1 and a-2.

[0070] Case a-1, if the terminal device does not listen in the listening window in slot a, the terminal device will determine whether slot a+q*Prxlg overlaps with resource R(x, y+j*Ptxlg). If they overlap, the resource R(x, y) is excluded from the resource set A. Wherein, j=0, 1, 2, 3…C-1, C is determined by the random counter (counter) value generated by the terminal device. Ptxlg is the number of Ptx converted into logical slots. Prxlg is the number of Prx converted into logical slots, where Prx is any allowed resource reservation period in the resource pool. If Prx Tscal / Prx , otherwise Q=1. Tscal is equal to the value of T2 converted into milliseconds.

[0071] Case a-2: If the terminal device detects the first SCI transmitted in the PSCCH on E(v, m) in the time slot m within the listening window, the terminal device measures the SL-Reference Signal Receiving Power (RSRP) of the PSCCH or the SL-RSRP of the PSSCH scheduled by the PSCCH (i.e., the SL-RSRP of the PSSCH transmitted in the same time slot as the PSCCH).

[0072] If the measured SL-RSRP is greater than the SL-RSRP threshold value, and the resource reservation between transport blocks (TBs) is activated in the resource pool used by the terminal device, the terminal device assumes that the first sidelink control information of the same content is received on the time slot m+q*Prxlg. Where q=1, 2, 3…Q, if Prx Tscal / Prx , otherwise Q=1. Tscal is equal to the value of T2 converted into milliseconds. Prxlg is the number of Prx converted into logical time slots, where Prx is the resource reservation period indicated by the “resource reservation period” in the first sidelink control information transmitted in the PSCCH detected by the terminal device. The terminal device will determine whether the resources indicated by the “time resource assignment” and “frequency resource assignment” fields of the first sidelink control information received in the time slot m and the Q first sidelink control information assumed to be received overlap the resources R(x, y+j*Ptxlg). If they overlap, the terminal device excludes the corresponding resources R(x, y) from the set A. The above j=0, 1, 2, 3…C-1, C is determined by the random counter value generated by the terminal device. Ptxlg is the number of Ptx converted into logical time slots, and Ptx is the resource reservation period determined by the terminal device performing resource selection.

[0073] The above RSRP threshold is determined by the priority P1 carried by the PSCCH detected by the terminal device and the priority P2 of the data to be transmitted by the terminal device. The configuration of the resource pool used by the terminal device can include a SL-RSRP threshold table containing the SL-RSRP threshold corresponding to all priority combinations. The configuration of the resource pool can be network configured or preconfigured. If the remaining resources in the resource set A after the above resource exclusion are insufficient M totalX%, the terminal device can raise the SL-RSRP threshold by 3dB, re-execute step a, and X can take values {20, 35, 50}. The configuration of the resource pool used by the terminal device contains a correspondence between the priority and the possible values of X, and the terminal device can determine the value of X according to the priority of the data to be sent and the correspondence.

[0074] The physical layer of the terminal device can report the resource set A after excluding the resources to the higher layer, i.e., the media access control (MAC) layer of the terminal.

[0075] Step b, the higher layer (such as the MAC layer) randomly selects resources from the reported candidate resource set to send data. That is, the terminal device randomly selects resources from the candidate resource set to send data.

[0076] It should be noted that the RSRP threshold is determined by the priority P1 carried in the PSCCH overheard by the terminal device and the priority P2 of the data to be sent by the terminal device.

[0077] In addition, whether the terminal device compares the measured PSCCH-RSRP or the PSSCH-RSRP scheduled by the PSCCH with the SL-RSRP threshold depends on the resource pool configuration of the resource pool used by the terminal device. The resource pool configuration can be network configured or preconfigured.

[0078] It should be further noted that X% can take values {20%, 35%, 50%}. The configuration of the resource pool used by the terminal device contains a correspondence between the priority and the possible values of X, and the terminal device determines the value of X% according to the priority of the data to be sent and the correspondence. The resource pool configuration can be network configured or preconfigured.

[0079] Data transmission method of sidelink communication Some sidelink communication systems (such as long term evolution vehicle to everything (LTE-V2X)) support a broadcast-based data transmission mode (hereinafter referred to as broadcast transmission). For broadcast transmission, the receiving terminal can be any terminal device around the sending terminal. For example, Figure 6 Terminal device 1 is the sending terminal, and the receiving terminal corresponding to the sending terminal is any terminal device around terminal device 1, such as terminal devices 2-6 in Figure 6 .

[0080] In addition to broadcast transmission, some communication systems also support unicast-based data transmission (hereinafter referred to as unicast transmission) and / or groupcast-based data transmission (hereinafter referred to as groupcast transmission). For example, new radio vehicle to everything (NR-V2X) is expected to support automatic driving. Automatic driving puts higher requirements on data interaction between vehicles. For example, data interaction between vehicles requires higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, and the like. Therefore, in order to improve the performance of data interaction between vehicles, NR-V2X introduces unicast transmission and groupcast transmission.

[0081] For unicast transmission, the receiving end terminal generally has only one terminal device. For example, terminal device 1 and terminal device 2 are engaged in unicast transmission. Terminal device 1 can be a sending end terminal, and terminal device 2 can be a receiving end terminal, or terminal device 1 can be a receiving end terminal, and terminal device 2 can be a sending end terminal. Figure 7

[0082] For groupcast transmission, the receiving end terminal can be a terminal device in a communication group, or the receiving end terminal can be a terminal device within a certain transmission distance. For example, terminal device 1, terminal device 2, terminal device 3, and terminal device 4 form a communication group. If terminal device 1 transmits data, other terminal devices (terminal device 2 to terminal device 4) in the group can all be receiving end terminals. Figure 8

[0083] Unlicensed spectrum Unlicensed spectrum is a spectrum that can be used for communication of radio equipment by countries and regions, which is generally considered as a shared spectrum. That is, communication devices in the same or different communication systems can use the spectrum as long as they meet the regulatory requirements set by the country or region on the spectrum, without the need to apply for exclusive spectrum authorization from the government.

[0084] In order to enable friendly coexistence of various communication devices (or communication systems) using unlicensed spectrum for wireless communication on the spectrum, some countries or regions have stipulated regulatory requirements that need to be met for using unlicensed spectrum. For example, communication devices follow the principle of “listen before talk” (LBT). LBT means that a communication device needs to perform channel sensing before transmitting a signal on a channel of unlicensed spectrum. If the channel sensing result is that the channel is idle, the communication device can use the channel of unlicensed spectrum to transmit a signal; if the channel sensing result is that the channel is busy, the communication device is generally not allowed to use the channel of unlicensed spectrum to transmit a signal. ​​

[0085] Relationship between resources The resources involved in the embodiments of this application may include channels, resource block (RB) sets, and resource pools. The following is in conjunction with... Figure 9 This section introduces the relationship between these three resources.

[0086] In some embodiments, an RB set may be associated with one or more resource pools, or a resource pool may be associated with one or more RB sets. RB sets associated with different resource pools may overlap, or different resource pools may be associated with different RB sets.

[0087] like Figure 9 As shown, RB set A can be associated with resource pool 1 and resource pool 2. Some resources in RB set A belong to resources in resource pool 1, while other resources belong to resources in resource pool 2. Resource pool 2 is associated with RB set A and RB set B. Some resources in resource pool A belong to resources in RB set A, while other resources belong to resources in RB set B. Figure 9 In the scheme shown, both resource pool 1 and resource pool 2 contain resources from resource set A.

[0088] Figure 9 In the illustrated scheme, the resources contained in resource pool 1 and resource pool 2 do not overlap. Of course, in some implementations, the resources contained in resource pool 1 and resource pool 2 may overlap.

[0089] A set of RBs can be associated with one or more LBT channels. Figure 9 For example, RB set A can be associated with channel 1 and channel 2; RB set B can be associated with channel 3 and channel 4. A channel can be the smallest frequency domain granularity for LBT; therefore, the aforementioned channels can also be called LBT channels.

[0090] NR in unlicensed spectrum (NR-U) When the terminal device detects consistent uplink LBT failure, the terminal device can take measures specified in the protocol. The LBT detection of the terminal device can be per bandwidth part (BWP) and based on all uplink transmissions within the BWP. When consistent uplink LBT failure is detected on a secondary cell (SCell), the terminal device can report the LBT failure to the network device on a serving cell different from the SCell on which the failure is detected. The terminal device can report the LBT failure through a medium access control control element (MAC CE). The network device is a master node (MN) or a secondary node (SN), wherein the MN is for a master cell group (MCG) and the SN is for a secondary cell group (SCG). If there is no available resource to transmit the MAC CE, the terminal device can transmit a scheduling request (SR).

[0091] When consistent uplink LBT failure is detected on a SpCell, the terminal device can switch to another uplink (UL) BWP on the cell that is configured with RACH resources, initiate random access, and report the failure through a MAC CE. When there are multiple UL BWP available for switching, the terminal device can select one of them based on its own implementation.

[0092] For a primary secondary cell (PSCell), if consistent uplink LBT failure is detected on all UL BWP configured with RACH resources, the terminal device can declare SCG radio link failure (RLF) and report the failure to the MN through SCGFailureInformation.

[0093] For a primary cell (PCell), if the terminal device detects uplink BWP failure on all UL BWP with configured RACH resources, the terminal device can declare RLF.

[0094] Sidelink-unlicense (SL-U) In the NR-V2X system, the resource for the terminal device to perform the sidelink data transmission can be allocated by the network device (such as the resource allocation manner in the first mode) or determined by the terminal device based on the resource listening result (such as the resource selection manner in the second mode), and the two resource allocation manners can also be applied to the SL-U scenario.

[0095] In the SL-U system, when the terminal device determines the sidelink transmission resource, LBT needs to be performed before data transmission. If LBT is successful, data transmission can be performed, otherwise data cannot be transmitted on the determined sidelink transmission resource. If LBT is not successful, the terminal device can consider giving up transmission or triggering resource reselection and the like.

[0096] In order to support the terminal device to work normally on the unlicensed frequency spectrum, enhanced consideration of continuous LBT failure is introduced. The terminal device can perform the judgment of continuous LBT failure and the recovery of continuous LBT failure at the MAC layer. For example, the terminal device can be configured with a maximum BLT failure indication number and a timer, which can be used to determine whether to trigger continuous LBT failure. When the physical layer (or physical layer entity) reports an LBT failure indication to the MAC layer (or MAC layer entity) each time, the MAC layer needs to reset and trigger the timer to start. When the number of continuously reported LBT failure indications by the physical layer exceeds the configured maximum number, the MAC layer can trigger the continuous LBT failure process. On the other hand, if the MAC layer does not receive the LBT failure indication reported by the physical layer until the timer expires, the MAC layer can reset the counter and the timer.

[0097] The above continuous LBT failure can also be referred to as LBT continuous failure or continuous LBT failure, and the name is not limited in the embodiments of the application.

[0098] At present, the protocol only mentions that continuous LBT failure can be triggered, but the related details of continuous LBT failure have not been clearly specified.

[0099] Based on this, the embodiments of the present application provide a wireless communication method and device, which considers the information related to the resource granularity when detecting the continuous LBT failure, and then determines the strategy related to the continuous LBT, thereby providing a clear solution for the terminal device to perform the operation related to the continuous LBT failure.

[0100] The wireless communication method provided by the embodiments of the present application will be described in detail below. Figure 10 The wireless communication method provided by the embodiments of the present application will be described in detail below.

[0101] Referring to Figure 10 In step S1010, the terminal device determines a first strategy related to continuous LBT failure.

[0102] The terminal device in the embodiments of the present application can be a terminal device performing sidelink communication.

[0103] In some embodiments, the detection of the consecutive LBT failure can be related to a resource granularity. The resource granularity can include a RB set and / or a resource pool. For example, the terminal device can determine whether the RB set has the consecutive LBT failure, or the terminal device can determine whether the resource pool has the consecutive LBT failure.

[0104] In some embodiments, the first strategy can include one or more of the following: a resource switching strategy, a second strategy, and a third strategy. The second strategy can be related to canceling the triggered consecutive LBT failure (consecutive LBT failure state or consecutive LBT failure identifier), and the third strategy can be related to determining the consecutive LBT failure.

[0105] The third strategy will be introduced first.

[0106] In some embodiments, the terminal device can detect the RB set to determine whether the RB set has the consecutive LBT failure, or the terminal device can detect the resource pool to determine whether the resource pool has the consecutive LBT failure. The RB set having the consecutive LBT failure can also be understood as the consecutive LBT failure occurring on the RB set, and the resource pool having the consecutive LBT failure can also be understood as the consecutive LBT failure occurring on the resource pool. Examples will be given below.

[0107] In some embodiments, the third strategy can include: if the number of times of LBT failures of the first RB set reaches a first preset threshold in a first preset time period, determining that the first RB set has the consecutive LBT failure. The third strategy can be a strategy for determining whether the RB set has the consecutive LBT failure. The first preset time period and / or the first preset threshold can be indicated by the network device to the terminal device, or indicated by other terminal devices to the terminal device, or determined by the terminal device itself, or can also be predefined in a protocol.

[0108] In some embodiments, whether the first RB set has the LBT failure can be determined by the physical layer of the terminal device, and the number of times of LBT failures of the first RB set can be recorded by the MAC layer of the terminal device. The physical layer of the terminal device can report to the MAC layer of the terminal device when the first RB set has the LBT failure, and then the MAC layer of the terminal device records the number of times of LBT failures of the first RB set. The process of the terminal device determining whether the first RB set has the consecutive LBT failure will be described in detail below.

[0109] When the MAC layer receives the indication information that the first RB set indicated by the physical layer fails LBT, if the first timer corresponding to the first RB set is not started, the MAC layer can start the first timer. The first timer can also be referred to as an LBT failure timer. If the first timer has been started, the first counter corresponding to the first RB set is incremented by 1. The first counter can also be referred to as an LBT failure counter. The MAC layer triggers resource reselection, which is triggered due to LBT failure, and the reselected resource can be a resource in the current RB set (without switching the RB set). Before the first timer expires, if the value recorded by the first counter is greater than or equal to a first preset threshold, it can be determined that continuous LBT failure occurs on the first RB set. If the value recorded by the first counter is less than the first preset threshold when the first timer expires, the first counter is set to zero.

[0110] In some embodiments, if the first RB set fails LBT continuously, the MAC layer can indicate to the physical layer the continuous LBT failure and / or the RB set on which the continuous LBT failure occurs. If the MAC layer indicates to the physical layer the continuous LBT failure, the physical layer can determine the RB set on which the continuous LBT failure occurs according to the previously detected RB set.

[0111] Of course, in some embodiments, the physical layer can also determine whether the RB set fails LBT continuously by itself. The physical layer can also maintain the timer and the counter by itself and record the number of times the RB set fails LBT, so as to determine whether the RB set fails LBT continuously.

[0112] In some embodiments, the third strategy can include: if the number of times the RB set associated with the first resource pool fails LBT reaches a second preset threshold within a second preset time period, it is determined that the first resource pool fails LBT continuously. The third strategy can be a strategy for determining whether the resource pool fails LBT continuously. The second preset time period and / or the second preset threshold can be indicated by the network device to the terminal device, or indicated by other terminal devices to the terminal device, or determined by the terminal device itself, or can also be predefined in the protocol.

[0113] The RB set associated with the first resource pool can include one or more RB sets. In some implementations, the RB set associated with the first resource pool can refer to part or all of the resources in the RB set belonging to the resources in the first resource pool.

[0114] In some embodiments, whether the RB set associated with the first resource pool fails LBT can be determined by the physical layer of the terminal device, and the number of times the first resource pool fails LBT can be recorded by the MAC layer of the terminal device. The physical layer of the terminal device can report to the MAC layer of the terminal device when the RB set associated with the first resource pool fails LBT, and then the MAC layer of the terminal device records the number of times the RB set associated with the first resource pool fails LBT. The process of the terminal device determining whether the first resource pool fails continuous LBT is described in detail below.

[0115] When the MAC layer receives the indication information of the physical layer indicating that the RB set associated with the first resource pool fails LBT, if the second timer corresponding to the first resource pool is not started, the MAC layer can start the second timer. The second timer can also be referred to as an LBT failure timer. If the second timer has been started, the second counter corresponding to the first resource pool is incremented by 1. The second counter can also be referred to as an LBT failure counter. The MAC layer triggers resource reselection, which is triggered due to LBT failure. Before the second timer expires, if the value recorded by the second counter is greater than or equal to a second preset threshold, it can be determined that continuous LBT failure occurs on the first resource pool. If the value recorded by the second counter is less than the second preset threshold when the second timer expires, the second counter is set to zero.

[0116] Of course, in some embodiments, the physical layer can also determine whether the resource pool fails continuous LBT. The physical layer can also maintain the timer and the counter itself, and record the number of times the RB set associated with the resource pool fails LBT, so as to determine whether the resource pool fails continuous LBT.

[0117] In some embodiments, the above-mentioned LBT failure of the RB set associated with the first resource pool can be LBT failure of any one of the RB sets associated with the first resource pool, or LBT failure of one or more RB sets associated with the first resource pool. For example, the physical layer detects LBT failure of RB set a for the first time, and if it is detected that RB set a fails LBT, it indicates the MAC layer, and the MAC layer increments the second counter by 1. When LBT failure is detected for the second time, the physical layer can detect RB set a or RB set b. Assuming that the physical layer detects RB set b and detects that RB set b fails LBT, the physical layer indicates the MAC. The MAC layer can increment the second counter by 1. That is, the second counter can not distinguish between the RB sets that fail LBT, but uniformly count the RB sets corresponding to the first resource pool.

[0118] In some embodiments, if a first resource pool has a continuous LBT failure, the MAC layer can indicate the continuous LBT failure and / or the resource pool in which the continuous LBT failure occurs to the physical layer. If the MAC layer indicates the continuous LBT failure to the physical layer, the physical layer can determine the resource pool in which the continuous LBT failure occurs according to the resource pool to which the previously detected RB set is associated.

[0119] Embodiments of the present application do not make specific limitations on the way of determining whether the RB set has a LBT failure. In some implementations, if the RB set is associated with one channel, the RB set is determined to have a LBT failure in the case that the channel has a LBT failure. In other implementations, if the RB set is associated with multiple channels, the RB set has a LBT failure in relation to second information, which can include one or more of the following: all channels associated with the RB set have a LBT failure; at least one channel associated with the RB set has a LBT failure; the channel in which the resource for data transmission is located has a LBT failure. The resource for data transmission can refer to the resource required by the terminal device to send data, or the resource selected by the terminal device, or the resource scheduled by the network device, etc. The channel in which the resource for data transmission is located can be one or more of the channels associated with the RB set. The above-mentioned channel can also be referred to as an LBT channel.

[0120] For example, if the RB set is associated with multiple channels, the terminal device (or the physical layer of the terminal device) determines that the RB set has a LBT failure in the case that all the multiple channels have a LBT failure. For another example, if the RB set is associated with multiple channels, the terminal device (or the physical layer of the terminal device) determines that the RB set has a LBT failure in the case that at least one of the multiple channels has a LBT failure. That is, as long as any one of the multiple channels has a LBT failure, the terminal device can determine that the RB set has a LBT failure. Of course, in some implementations, the terminal device can also determine that the RB set has a continuous LBT failure in the case that a preset number of channels of the multiple channels have a LBT failure. For another example, if the RB set is associated with multiple channels, the terminal device (or the physical layer of the terminal device) determines that the RB set has a LBT failure in the case that the channel in which the resource for data transmission is located has a LBT failure.

[0121] Embodiments of the present application do not make specific limitations on the channel associated with the RB set. For example, part or all of the resources in the channel associated with the RB set belong to the resources in the RB set.

[0122] In some embodiments, the second information is related to whether the terminal device is configured with a guard band. The guard band can refer to a guard band between two channels. For example, if the terminal device is configured with a guard band, the second information can include that all channels associated with the RB set have failed LBT. For another example, if the terminal device is not configured with a guard band, the second information can include that at least one channel associated with the RB set has failed LBT.

[0123] Resource switching strategy In some implementations, if the terminal device has consecutive LBT failures, in order to ensure the transmission performance of the terminal device, the terminal device can perform resource switching. The terminal device can perform resource switching based on a resource switching strategy. The resource switching strategy can also be referred to as other strategies, that is, the resource switching strategy can be replaced by other terms, and the embodiments of the present application do not make specific limitations thereto. The resource switching strategy is described in detail below.

[0124] As an example, the resource switching strategy can include one or more of the following: switching a resource pool, switching an RB set, and switching a time-frequency resource. For example, the terminal device can switch an RB set in the case that the RB set has LBT failure, such as switching from a first RB set to a second RB set. For another example, the terminal device can switch a resource pool in the case that the RB set has consecutive LBT failures, such as switching from a first resource pool to a second resource pool. The first resource pool can be a resource pool associated with the RB set that has consecutive LBT failures. The second resource pool is different from the first resource pool. In some implementations, the second resource pool can be associated with the RB set that has consecutive LBT failures, or can not be associated with the RB set that has consecutive LBT failures. For another example, the terminal device can switch a time-frequency resource in the case that the RB set has consecutive LBT failures, such as switching from a first time-frequency resource to a second time-frequency resource. The first time-frequency resource can be a time-frequency resource associated with the RB set that has consecutive LBT failures, such as the first time-frequency resource being a resource in the RB set that has consecutive LBT failures. The second time-frequency resource can be a resource other than the resource in the RB set that has LBT failure. For example, the first time-frequency resource is a resource in a first RB set, the second time-frequency resource is a resource in a second RB set, and the first RB set is an RB set that has consecutive LBT failures. The terminal device (or the MAC layer of the terminal device) can select a resource on an RB set that is not marked as having consecutive LBT failures when selecting a time-frequency resource. The above resource switching strategy can be a strategy proposed for the RB set that has consecutive LBT failures.

[0125] As another example, the resource switching policy can include one or more of the following: switching resource pool, switching time-frequency resource. For example, the terminal device can switch resource pool in the case that the resource pool has continuous LBT failure, such as switching from a first resource pool to a second resource pool. For another example, the terminal device can switch time-frequency resource in the case that the resource pool has continuous LBT, such as switching from a first time-frequency resource to a second time-frequency resource. The first time-frequency resource can be a time-frequency resource associated with the resource pool that has continuous LBT failure, such as a resource in the resource pool that has continuous LBT failure. The second time-frequency resource can be a resource other than the resource in the resource pool that has LBT failure. For example, the first time-frequency resource is a resource in the first resource pool, the second time-frequency resource is a resource in the second resource pool, and the first resource pool is the resource pool that has continuous LBT failure. When selecting time-frequency resource, the terminal device (or the MAC layer of the terminal device) can select a resource on a RB set that is not marked as having continuous LBT failure. The above resource switching policy can be a policy proposed for the resource pool that has continuous LBT failure.

[0126] In some embodiments, after the terminal device switches to a new resource pool, the new resource pool can still be associated with the RB set that has continuous LBT failure.

[0127] The conditions for the terminal device to switch resources are described below.

[0128] If the resource switching policy includes switching resource pool, the terminal device can switch resource pool in the case that the first condition is met. The first condition can be related to one or more of the following information: whether the RB set has continuous LBT failure; data transmission requirement. The data transmission requirement can refer to some related requirements for transmission resources in the protocol. For example, the data transmission requirement can include DRX requirement and / or minimum time interval requirement, etc.

[0129] In some embodiments, the above continuous LBT failure can refer to continuous LBT failure that has been triggered but not eliminated.

[0130] In some embodiments, the terminal device switches resource pool in the case that the RB set has continuous LBT failure.

[0131] For example, the first condition can include that one or more RB sets associated with the current resource pool have consecutive LBT failures, that is, the terminal device switches the resource pool in a case where one or more RB sets associated with the current resource pool have consecutive LBT failures. For another example, the first condition can include that all RB sets associated with the current resource pool have consecutive LBT failures, that is, the terminal device switches the resource pool in a case where all RB sets associated with the current resource pool have consecutive LBT failures. For another example, the first condition can include that a preset number of RB sets associated with the current resource pool have consecutive LBT failures, that is, the terminal device switches the resource pool in a case where a preset number of RB sets associated with the current resource pool have consecutive LBT failures. The preset number can be indicated by the network device or can be predefined.

[0132] In some embodiments, the first condition can include that the number of remaining resources in the resource pool is less than or equal to a preset threshold. If the number of remaining resources in the resource pool is less than or equal to the preset threshold, that is, no resource in the resource pool can be selected to meet the condition, the terminal device can switch the resource pool. The remaining resources belong to resources that have no consecutive LBT failures and / or resources that meet the data transmission requirements. The remaining resources can include time-frequency resources and / or RB resources. That is, the granularity of the resource division in the embodiments of the present application can be time-frequency resources and / or RB sets.

[0133] For example, if no resource in the resource pool can be selected to meet the data transmission requirements except the resources associated with the RB sets having consecutive LBT failures, the terminal device can switch the resource pool.

[0134] The above resource pool switching can be determined by the MAC layer. In a case where the first condition is met, the MAC layer can trigger resource pool switching or new resource selection. The MAC layer can indicate the switched resource pool to the physical layer. The switched resource pool is different from the resource pool before switching.

[0135] If the number of remaining resources in the resource pool is greater than the preset threshold, that is, a sufficient number of resources can be selected in the resource pool, the MAC layer can send the selected resources and the corresponding data packets (such as MAC protocol data units (PDUs)) to be transmitted to the physical layer.

[0136] In some embodiments, if the resource switching strategy includes switching RB sets, the terminal device can switch the RB sets in a case where the current RB set has consecutive LBT failures. The above switching strategy is applicable to a case where consecutive LBT failures occur on the RB set.

[0137] In some embodiments, if the resource switching policy comprises switching time-frequency resources, the terminal device can switch time-frequency resources in the case that continuous LBT failures occur on the current RB set. The above switching policy is applicable to the case that continuous LBT failures occur on the RB set.

[0138] In some embodiments, if the resource switching policy comprises switching resource pools, the terminal device can switch resource pools in the case that continuous LBT failures occur on the current resource pool. The above switching policy is applicable to the case that continuous LBT failures occur on the resource pool.

[0139] In some embodiments, if the resource switching policy comprises switching time-frequency resources, the terminal device can switch time-frequency resources in the case that continuous LBT failures occur on the current resource pool. The above switching policy is applicable to the case that continuous LBT failures occur on the resource pool.

[0140] The above time-frequency resources can be time-frequency resources in an RB set or time-frequency resources in a resource pool. There are various ways to divide time-frequency resources in the time domain and the frequency domain, and the embodiments of the present application do not make specific limitations thereon. For example, the division granularity of time-frequency resources in the time domain can include a symbol, a time slot, a subframe, etc. The division granularity of time-frequency resources in the frequency domain can include a channel, a subchannel, an RB, a physical resource block (PRB), etc.

[0141] The second strategy is introduced below.

[0142] In some embodiments, the second strategy can comprise: in the case that a second condition is met, performing a cancel continuous LBT failure operation, such as canceling the triggered continuous LBT failure of the first resource. The second condition can comprise one or more of the following: the terminal device has performed a first operation; the terminal device has sent a continuous LBT failure report. The first operation can be related to resource switching.

[0143] For example, the terminal device can perform the cancel continuous LBT failure operation in the case that the first operation is performed. For another example, the terminal device can perform the cancel continuous LBT failure operation in the case that the continuous LBT failure report is sent. For another example, the terminal device can perform the cancel continuous LBT failure operation in the case that the first operation is performed and the continuous LBT failure report is sent.

[0144] In some implementations, the terminal device sending the continuous LBT failure can comprise the terminal device sending a continuous LBT failure report to a network device, and / or the terminal device sending a continuous LBT failure report to a peer device.

[0145] The first operation is not limited in the embodiments of the present application. For example, the first operation can include resource switching. For another example, the first operation can include LBT success in the switched resource. For another example, the first operation can include data sending success in the switched resource. For another example, the first operation can include unicast link RLF triggering. It should be noted that the above first operation can be used alone or in combination, and the embodiments of the present application are not limited thereto.

[0146] The conditions for the terminal device to perform the cancel continuous LBT failure operation are exemplified below.

[0147] For example, the terminal device can perform the cancel continuous LBT failure operation when resource switching is performed and data sending is successful in the switched resource. For another example, the terminal device can perform the cancel continuous LBT failure operation when resource switching is performed and LBT is successful in the switched resource. For another example, the terminal device can perform the cancel continuous LBT failure operation when the RLF of the unicast link is triggered. For another example, the terminal device can perform the cancel continuous LBT failure operation when resource switching is performed, data sending is successful in the switched resource, and the terminal device sends a continuous LBT failure report. For another example, the terminal device can perform the cancel continuous LBT failure operation when resource switching is performed, LBT is successful in the switched resource, and the terminal device sends a continuous LBT failure report. For another example, the terminal device can perform the cancel continuous LBT failure operation when the RLF of the unicast link is triggered and the terminal device sends a continuous LBT failure report.

[0148] The unicast link RLF triggering can include one or more of the following: no LBT success in the target resource after switching, the target resource after switching has triggered continuous LBT failure, and no data success on the target resource after switching. The target resource can be all configured resources or a preset number of resources. The configured resource can refer to a resource configured by the network device. The target resource can include a resource pool and / or an RB set.

[0149] For example, if the terminal device has traversed all the configured resource pools or RB sets, none of which has LBT success or data has not been sent successfully, the RLF of the unicast link is triggered. For another example, the terminal device has performed N times of resource switching, none of which has LBT success or data has not been sent successfully, the RLF of the unicast link is triggered. The number N can be configured by the network device or predefined in the protocol. The resource switching can include one or more of the following: resource pool switching, RB set switching, time-frequency resource switching. For another example, if all the configured resources have triggered continuous LBT failure, or N resources of the configured resources have triggered continuous LBT failure, the RLF of the unicast link is triggered.

[0150] The first resource is not specifically limited in the embodiments of the present application. For example, the first resource can include one or more of the following: an RB set associated with one or more resource pools before switching; an RB set before switching; a resource pool before switching.

[0151] In some embodiments, the first resource can include an RB set associated with one or more resource pools before switching. For example, if the RB set has triggered continuous LBT failure, and the terminal device has performed resource pool switching, the first resource can include an RB set associated with one or more resource pools before switching. The one or more resource pools can be the resource pools associated with the RB set that has triggered continuous LBT failure.

[0152] In some embodiments, the first resource can include one or more RB sets before switching. For example, if the RB set has triggered continuous LBT failure, and the terminal device has performed RB set switching, the first resource can include one or more RB sets before switching. The one or more RB sets can be the RB set that has triggered continuous LBT failure.

[0153] In some embodiments, the first resource can include one or more resource pools before switching. For example, if the resource pool has triggered continuous LBT failure, and the terminal device has performed resource pool switching, the first resource can include one or more resource pools before switching. The one or more resource pools can be the resource pool that has triggered continuous LBT failure.

[0154] In some embodiments, if the second condition includes that the RLF of the unicast link is triggered, the first resource can include the target resource.

[0155] In some embodiments, if the first condition includes that the terminal device has sent a continuous LBT failure report, the first resource includes the resource corresponding to the sent continuous LBT failure.

[0156] The specific cases in which the terminal device cancels the triggered continuous LBT failure are illustrated below.

[0157] In some embodiments, the terminal device can cancel the continuous LBT failures on the RB set associated with one or more resource pools before the switching in the case that the resource pool switching occurs or a new resource selection has been triggered, or the terminal device can cancel the continuous LBT failures on the RB set associated with one or more resource pools before the switching in the case that the resource pool switching occurs and the LBT succeeds or the data transmission succeeds in the new resource pool.

[0158] In some embodiments, the terminal device can trigger the RLF of the unicast link and cancel the continuous LBT failures on the RB set associated with all the resource pools in the case that none of the configured resource pools has the LBT success or the data transmission success or all of the configured resource pools have the continuous LBT failures, or the terminal device can trigger the RLF of the unicast link and cancel the continuous LBT failures on the RB set associated with the preset number of resource pools in the case that none of the preset number of resource pools has the LBT success or the data transmission success.

[0159] In some embodiments, the terminal device can cancel the continuous LBT failures on one or more RB sets before the switching in the case that the RB set has the continuous LBT failures and the RB set switching is performed or a new resource selection has been triggered, or the terminal device can cancel the continuous LBT failures on one or more RB sets before the switching in the case that the RB set switching occurs and the LBT succeeds or the data transmission succeeds in the RB set after the switching.

[0160] In some embodiments, the terminal device can trigger the RLF of the unicast link and cancel the continuous LBT failures on all the RB sets in the case that none of the configured RB sets has the LBT success or the data transmission success or all of the configured RB sets have the continuous LBT failures, or the terminal device can trigger the RLF of the unicast link and cancel the continuous LBT failures on the preset number of RB sets in the case that none of the preset number of RB sets has the LBT success or the data transmission success.

[0161] In some embodiments, the terminal device can cancel the continuous LBT failures on the RB set associated with one or more resource pools before the switching in the case that the resource pool switching occurs or a new resource selection has been triggered, or the terminal device can cancel the continuous LBT failures on the RB set associated with one or more resource pools before the switching in the case that the resource pool switching occurs and the LBT succeeds or the data transmission succeeds in the new resource pool.

[0162] In some embodiments, the terminal device can trigger the RLF of the unicast link and cancel the continuous LBT failure on all the resource pools in a case that the continuous LBT failure occurs on the resource pools and there is no LBT success or data transmission success or the continuous LBT failure occurs on all the resource pools configured, or the terminal device can trigger the RLF of the unicast link and cancel the continuous LBT failure on the preset number of resource pools in a case that there is no LBT success or data transmission success on the preset number of resource pools.

[0163] The above-mentioned operation of canceling the continuous LBT failure can be performed by the MAC layer. In some embodiments, the MAC layer can send first indication information to the physical layer, the first indication information being used to indicate the cancellation of the continuous LBT failure and / or the resource on which the continuous LBT failure is canceled. For example, the first indication information can be used to indicate the cancellation of the continuous LBT failure, and after receiving the first indication information, the physical layer can determine which resources of the continuous LBT failure state to cancel according to the LBT failure indication reported to the MAC layer previously. For another example, the first indication information can be used to indicate the resource on which the continuous LBT failure is canceled, that is, the first indication information can also directly indicate which resources of the continuous LBT failure state to cancel. The resource here can include a RB set / or a resource pool.

[0164] Resource configuration In some embodiments, the selected resource used by the terminal device for data transmission is determined based on second indication information. The selected resource can be, for example, a resource used for data to be transmitted. The second indication information can be used to indicate one or more of the following parameters: information of a target resource pool, the information of the target resource pool being determined based on information related to the continuous LBT failure; and information related to a target RB set.

[0165] In some embodiments, the second indication information can be sent by the MAC layer to the physical layer. For example, the MAC layer can indicate the second indication information to the physical layer in the process of triggering the physical layer to select resources. In some implementations, the MAC layer can consider the information of the resource on which the continuous LBT failure occurs when indicating the information of the target resource pool to the physical layer. In other implementations, the MAC layer can also directly indicate the information related to the RB set to the physical layer.

[0166] In some embodiments, the target resource pool can be associated with at least one RB set or resource pool on which the continuous LBT failure is not triggered. That is, there is at least one resource in the target resource pool that belongs to the available resources. For example, there is at least one resource in the target resource pool that belongs to the resource in the RB set on which the continuous LBT failure does not occur.

[0167] In some embodiments, the target resource pool contains at least one resource pool on which the continuous LBT failure is not triggered.

[0168] It should be noted that, in addition to the scenario of the embodiments of the present application, the resource selection on the unlicensed frequency band triggered in other cases can also consider the resource information of continuous LBT failure.

[0169] In some embodiments, the target RB set can include one or more of the following: a selected RB set, an RB set on which continuous LBT failure occurs. In some implementations, the selected RB set can refer to an RB set selected based on the RB set on which continuous LBT failure occurs or a resource pool. For example, the selected RB set can not include the RB set on which continuous LBT failure occurs. For another example, the selected RB set can not include the RB set associated with the resource pool on which continuous LBT failure occurs. The above-mentioned selected RB set is applicable to the case where continuous LBT failure occurs on the RB set.

[0170] In some embodiments, the second indication information can be used to indicate one or more of the following parameters: information of the target resource pool, information of the selected RB set, and the RB set on which continuous LBT failure occurs. The above-mentioned second indication information is applicable to the case where continuous LBT failure occurs on the RB set. The second indication information can be used to indicate one or more of the following parameters: information of the target resource pool, information of the selected RB set. The above-mentioned second indication information is applicable to the case where continuous LBT failure occurs on the resource pool.

[0171] In some embodiments, the second indication information can further include one or more of the following information: transmission data related information, currently available channel occupancy time (COT) information, received inter-UE coordination information, SL DRX information, etc. The transmission data related information can include one or more of the following information: required resource size, retransmission times, priority, etc. The available COT information can include COT time related information such as remaining duration, start time, end time, etc.

[0172] The determination method of the above-mentioned selected resource is introduced as follows. In some embodiments, the above-mentioned selected resource can be sent by the MAC layer to the physical layer. The selected resource can be determined by the MAC layer based on the second resource, which is determined by the physical layer based on the resource selection of the second indication information.

[0173] In some embodiments, the physical layer can perform resource selection according to the second indication information. When performing resource selection, the physical layer can perform resource selection in the manner of resource listening introduced above. In some implementations, the physical layer can exclude the unavailable resources to obtain the available resource set A.

[0174] In some embodiments, the second resource can be determined based on one or more of the following resources: resources in the target resource pool, resources in the selected RB set, and excluding the RB set in which the continuous LBT failure occurs.

[0175] In some implementations, if the parameter indicated by the second indication information includes the target resource pool information, the set A can be a resource set obtained according to the target resource pool. For example, the physical layer can perform resource listening on the resources in the target resource pool to obtain the set A. If the parameter indicated by the second indication information includes the selected RB set, the set A can be a resource set obtained according to the selected RB set. For example, the physical layer can perform resource listening on the resources in the selected RB set to obtain the set A. If the parameter indicated by the second indication information includes the RB set in which the continuous LBT failure occurs, the set A can be a resource set obtained by excluding the RB set in which the continuous LBT failure occurs.

[0176] The above implementations can be used alone or in combination. For example, the physical layer can perform resource listening on the resources in the target resource pool and exclude the RB set in which the continuous LBT failure occurs to obtain the resource set A. For another example, the physical layer can perform listening on the resources in the selected RB set and exclude the RB set in which the continuous LBT failure occurs to obtain the resource set A. The RB set in which the continuous LBT failure occurs can be determined by the physical layer according to the previous LBT detection result, or can be indicated by the second indication information.

[0177] In some embodiments, the physical layer can report the resource set A to the MAC layer. The MAC layer can perform resource selection according to the resource set A reported by the physical layer.

[0178] In some embodiments, the MAC layer can perform resource selection in the resource set A, such as selecting resources on the RB set not marked as continuous LBT failure. Of course, if the physical layer has excluded the resources on the RB set in which the continuous LBT failure occurs when determining the resource set A, the MAC layer can directly perform resource selection in the resource set A. In addition, as described above, if the MAC layer can select enough resources in the resource set A, the MAC layer can send the selected resources (which can also be referred to as to-be-transmitted resources) and the corresponding to-be-transmitted data packets to the physical layer. If the MAC layer cannot select enough resources that meet the conditions in the resource set A, the MAC layer can trigger resource pool switching or new resource selection. For example, the MAC layer can indicate the switched resource pool to the physical layer. The physical layer can perform resource selection again based on the switched resource pool. The above operations can be applied to the case where the continuous LBT failure occurs on the RB set and the terminal device performs RB set switching.

[0179] In some embodiments, the MAC layer can perform resource selection in resource set A, such as selecting resources on the RB set that is not marked as continuous LBT failure. If the MAC layer can select enough resources in resource set A, the MAC layer can send the selected resources (which can also be referred to as to-be-transmitted resources) and corresponding to-be-transmitted data packets to the physical layer. The above operation can be applicable to the case where continuous LBT failure occurs on the RB set and the terminal device performs resource pool switching.

[0180] In some embodiments, the MAC layer can perform resource selection in resource set A and send the selected resources (which can also be referred to as to-be-transmitted resources) and corresponding to-be-transmitted data packets to the physical layer. The above operation can be applicable to the case where continuous LBT failure occurs on the resource pool and the terminal device performs resource pool switching.

[0181] The physical layer can perform LBT detection on the to-be-transmitted resources indicated by the MAC layer before transmitting the to-be-transmitted data packets. If the LBT is successful, the to-be-transmitted data packets are transmitted; if the LBT fails, the MAC layer is indicated of the LBT failure and / or the RB set on which the LBT failure occurs. Further, as described above, the MAC layer can count and time the RB set on which the LBT failure occurs according to the indication of the physical layer to determine whether the RB set triggers continuous LBT failure.

[0182] In some embodiments, in the case where continuous LBT failure occurs on the RB set, the MAC layer can trigger new resource selection. For example, the MAC layer can indicate to the physical layer a resource pool, which can be the same as the previous resource pool (i.e., the reselected resources are in other available RB sets in the current resource pool, and the resource pool is the resource pool that is not switched), or different from the previous resource pool (i.e., the reselected resources are in other available RB sets in other resource pools, and the resource pool is the resource pool that is switched).

[0183] The new resource selection process can be a resource selection process triggered by continuous LBT on a single RB set. The resource selection can be performed in the current resource pool (if there are still RB sets in the current resource pool that have not triggered continuous LBT failure), or in other resource pools. The specific resource pool in which the resource selection is performed can be determined by the implementation of the terminal device.

[0184] In some embodiments, in the case where continuous LBT failure occurs on the RB set, the MAC layer can trigger new resource selection. For example, the MAC layer can indicate to the physical layer a new RB set, which is the RB set that is switched.

[0185] It should be noted that the RB set in which the continuous LBT failure occurs in the embodiments of the present application can refer to the RB set in which the continuous LBT failure has been triggered and not cancelled, and the resource pool in which the continuous LBT failure occurs can refer to the resource pool in which the continuous LBT failure has been triggered and not cancelled.

[0186] The scheme of the embodiments of the present application will be described in detail below in combination with three examples. It should be noted that the following three examples are only for the convenience of understanding and introducing the present application, and should not limit the present application. In addition, in the absence of conflicts, the various examples can be used in combination with each other.

[0187] Example 1 Figure 11 It is shown that the continuous LBT failure occurs on the RB set, and the resource switching strategy is the case of switching the resource pool. For example, when all resources in a certain resource pool are marked as continuous LBT failure, the resource pool is replaced.

[0188] Referring to Figure 11 In step S1102, the MAC layer triggers resource selection or resource reselection. The MAC layer triggers the physical layer to perform resource selection, and at the same time of triggering, the MAC layer can send second indication information to the physical layer.

[0189] The second indication information can be used to indicate one or more of the following parameters: transmission data related information, currently available COT information, received IUC information, SL DRX information, target resource pool information, selected RB set information, RB set information in which the continuous LBT failure occurs, etc. Among them, the transmission data related information can include one or more of the following information: required resource size, retransmission times, priority, etc. The available COT information can include COT time related information, such as remaining duration, start time, end time, etc. The target resource pool information can be determined based on the RB set in which the continuous LBT failure occurs. The resource pool selected by the MAC layer needs to be associated with at least one RB set in which the continuous LBT failure has not been triggered. The selected RB set can consider the RB set in which the continuous LBT failure is triggered, that is, the selected RB set can exclude the RB set in which the continuous LBT failure has been triggered and not cancelled.

[0190] In step S1104, the physical layer performs resource selection. The physical layer can perform resource selection according to the second indication information, exclude unavailable resources, and obtain a set of available resources A.

[0191] If the second indication information indicates the target resource pool, the resource set A can be obtained based on the resources in the target resource pool; if the second indication information indicates the selected RB set, the resource set A can be obtained based on the resources in the selected RB set; if the second indication information indicates the resources on which the continuous LBT failure occurs, the resource set A can be obtained by excluding the RB set on which the continuous LBT failure occurs.

[0192] In step S1106, the physical layer reports the resource set A to the MAC layer.

[0193] In step S1108, the MAC layer performs resource selection according to the resource set A reported by the physical layer.

[0194] When performing resource selection, the MAC layer can consider the RB set on which the continuous LBT failure has been triggered but not cancelled. Specifically, the MAC layer can select resources (or time-frequency resources) on the RB set on which the continuous LBT failure has not been marked. It can be understood that after the terminal device switches to a new resource pool, the new resource pool can still be associated with the RB set on which the continuous LBT failure occurs, and this case also needs to be considered when performing resource selection.

[0195] In step S1110, the MAC layer determines whether there is no resource that can be selected. For example, the MAC layer can determine whether sufficient resources that meet the condition can be selected. If the MAC layer can select sufficient resources that meet the condition, step S1112 is performed; if the MAC layer cannot select sufficient resources that meet the condition, step S1126 is performed.

[0196] In step S1112, the MAC layer can send the selected resources, the data packet (such as MAC PDU) to be transmitted, and other transmission-related information to the physical layer.

[0197] In step S1114, the physical layer can perform LBT detection on the resources selected by the MAC layer before data transmission. If the LBT is successful, the data is transmitted; if the LBT fails, step S1116 is performed.

[0198] In step S1116, the physical layer sends an LBT failure indication to the MAC layer. Taking the RB set 1 as an example, the physical layer can send an LBT failure indication of the RB set 1 to the MAC layer.

[0199] If the RB set 1 is associated with multiple channels, the LBT failure indication of the RB set 1 can be sent in at least one of the following cases: all the channels send LBT failure; at least one channel sends LBT failure; the channel where the resource for data transmission is located sends LBT failure. In which case the LBT failure indication of the RB set 1 is sent, it is related to whether the terminal device is configured with a guard band. If the terminal device is configured with a guard band, the LBT failure indication of the RB set 1 can be sent in the case that all the channels send LBT failure; if the terminal device is not configured with a guard band, the LBT failure indication of the RB set 1 can be sent in the case that at least one channel sends LBT failure.

[0200] In step S1118, after the MAC layer receives the LBT failure indication of the RB set 1, if the RB set 1 timer is not started, the RB set 1 timer is started; if the RB set 1 timer has been started, the value of the RB set 1 counter is incremented by 1.

[0201] In addition, the MAC layer can also trigger resource reselection. The resource reselection is triggered by the LBT failure.

[0202] In step S1120, when the RB set 1 timer expires, it is determined whether the value of the RB set 1 counter is greater than a preset threshold.

[0203] In step S1122, if the value of the RB set 1 counter is greater than the preset threshold, it is determined that the RB set 1 has continuous LBT failure.

[0204] The MAC layer can trigger new resource selection. For example, it can be re-executed back to step S1102. The MAC layer can re-indicate the resource pool to the physical layer, which can be the previous resource pool (i.e. the current resource pool) or a new resource pool.

[0205] The new resource selection can be triggered by continuous LBT failure on a single RB set. If there is still an RB set in the current resource pool that has not triggered continuous LBT failure, the resource selection can be selected in the current resource pool, or the resource selection can also be selected in other resource pools.

[0206] In step S1124, when the RB set 1 timer expires, if the value of the RB set 1 counter does not reach the preset threshold, the RB set 1 counter is set to zero.

[0207] In step S1126, the MAC layer triggers resource pool switching or new resource selection. For example, it can be re-executed back to step S1102. The MAC layer can re-indicate the resource pool to the physical layer, which can be the switched resource pool, different from the previous resource pool.

[0208] At step S1128, after performing resource pool switching, the MAC layer can cancel the triggered continuous LBT failure on the RB set which has not been cancelled.

[0209] If a new resource selection or resource pool switching has been triggered, and LBT succeeds or data is successfully sent in the new resource pool, the terminal device can cancel the triggered continuous LBT failure on the RB set which has not been cancelled and is associated with the one or more resource pools before the switching.

[0210] If the terminal device has traversed all the configured resource pools and still fails to perform LBT or fails to successfully send data, the terminal device triggers RLF of all unicast links and cancels the triggered continuous LBT failure on the RB set which has not been cancelled.

[0211] If the terminal device has performed switching for N times (up to the configured number of times) and still fails to perform LBT or fails to successfully send data, the terminal device triggers RLF of all unicast links and cancels the triggered continuous LBT failure on the RB set which has not been cancelled.

[0212] If the terminal device is in a radio resource control (RRC) connected state, the terminal device in the connected state can send a continuous LBT failure report, such as sending the continuous LBT failure report to a network device or a peer device. In addition, the terminal device sending the continuous LBT failure report can also trigger a continuous LBT failure cancellation operation. That is, the terminal device can trigger the continuous LBT failure cancellation operation after performing resource switching, or can trigger the continuous LBT failure cancellation operation after sending the continuous LBT failure report. Therefore, it is necessary to specify how to perform the two continuous LBT failure cancellation operations.

[0213] Based on this, the embodiments of the present application propose that the terminal device can trigger the continuous LBT failure cancellation operation after performing the above two operations. For example, for the continuous LBT failure on a certain triggered RB set, the terminal device can trigger the continuous LBT failure cancellation operation after sending the continuous LBT failure report on the RB set and performing resource pool switching. Alternatively, the terminal device can trigger the continuous LBT failure cancellation operation after performing any one of the above two operations. For example, the terminal device can select to send the continuous LBT failure report or switch the resource pool, and trigger the continuous LBT failure cancellation operation after performing the corresponding operation.

[0214] After triggering the continuous LBT failure cancellation operation, the MAC layer can indicate the continuous LBT failure cancellation or the RB set on which the continuous LBT failure is cancelled to the physical layer.

[0215] Example 2 Figure 12 It is shown that the continuous LBT failure occurs on the RB set, and the resource switching strategy is to switch the RB set. For example, when a certain RB set is marked as continuous LBT failure, the RB set is replaced.

[0216] Referring to Figure 12 In step S1202, the MAC layer triggers resource selection or resource reselection. The MAC layer triggers the physical layer to perform resource selection, and at the same time of triggering, the MAC layer can send the second indication information to the physical layer.

[0217] The second indication information can be used to indicate one or more of the following parameters: transmission data related information, currently available COT information, received IUC information, SL DRX information, target resource pool information, selected RB set information, RB set information where continuous LBT failure occurs, etc. Among them, the transmission data related information can include one or more of the following information: required resource size, retransmission times, priority, etc. The available COT information can include COT time related information such as remaining duration, start time, end time, etc. The target resource pool information can be determined based on the RB set where continuous LBT failure occurs. The resource pool selected by the MAC layer needs to be associated with at least one RB set that has not triggered continuous LBT failure. The selected RB set can consider the RB set that triggers continuous LBT failure, that is, the selected RB set can exclude the RB set that has triggered continuous LBT failure and has not been cancelled.

[0218] In step S1204, the physical layer performs resource selection. The physical layer can perform resource selection according to the second indication information, exclude unavailable resources, and obtain a set of available resources A.

[0219] If the second indication information indicates the target resource pool, the resource set A can be obtained based on the resources in the target resource pool; if the second indication information indicates the selected RB set, the resource set A can be obtained based on the resources within the selected RB set; if the second indication information indicates the resource where continuous LBT failure occurs, the resource set A can be obtained by excluding the RB set where continuous LBT failure occurs.

[0220] In step S1206, the physical layer reports the resource set A to the MAC layer.

[0221] In step S1208, the MAC layer performs resource selection according to the resource set A reported by the physical layer.

[0222] In step S1210, if the MAC layer can select enough resources that meet the conditions, the MAC layer can send the selected resources, transmission related information such as MAC PDU, etc. to the physical layer.

[0223] At step S1212, the physical layer can perform LBT detection on the resource selected by the MAC layer before data transmission. If LBT succeeds, data is transmitted; if LBT fails, step S1214 is performed.

[0224] At step S1214, the physical layer sends an LBT failure indication to the MAC layer. Taking RB set 1 as an example, the physical layer can send an LBT failure indication of RB set 1 to the MAC layer.

[0225] If RB set 1 is associated with multiple channels, the LBT failure indication of RB set 1 can be sent in at least one of the following cases: LBT failure is sent on all channels; LBT failure occurs on at least one channel; LBT failure occurs on the channel where the resource for data transmission is located. Specifically, in which case the LBT failure indication of RB set 1 is sent, it is related to whether the terminal device is configured with a guard band. If the terminal device is configured with a guard band, the LBT failure indication of RB set 1 can be sent in the case that LBT failure is sent on all channels; if the terminal device is not configured with a guard band, the LBT failure indication of RB set 1 can be sent in the case that LBT failure occurs on at least one channel.

[0226] At step S1216, after the MAC layer receives the LBT failure indication of RB set 1, if the RB set 1 timer is not started, the RB set 1 timer is started; if the RB set 1 timer is already started, the value of the RB set 1 counter is incremented by 1.

[0227] In addition, the MAC layer can also trigger resource reselection. This resource reselection is triggered by LBT failure.

[0228] The MAC layer indicates to the physical layer consecutive LBT failures and / or RB sets that have consecutive LBT failures.

[0229] At step S1218, when the RB set 1 timer expires, it is determined whether the value of the RB set 1 counter is greater than a preset threshold.

[0230] At step S1220, if the value of the RB set 1 counter is greater than the preset threshold, it is determined that RB set 1 has consecutive LBT failures.

[0231] The MAC layer can trigger new resource selection. For example, it can go back to step S1202 and re-execute. The MAC layer can indicate to the physical layer a resource pool, which can be the previous resource pool (i.e. the current resource pool) or a new resource pool.

[0232] The new resource selection can be triggered by the continuous LBT failure on the single RB set. If there is still RB set in the current resource pool which has not triggered the continuous LBT failure, the resource selection can be selected in the current resource pool, or the resource selection can also be selected in other resource pools.

[0233] In step S1222, when the RB set 1 timer expires, if the value of the RB set 1 counter does not reach the preset threshold, the RB set 1 counter is set to zero.

[0234] If the RB set 1 has the continuous LBT failure, the MAC layer triggers the RB set switching or the new resource selection. For example, it can be re-executed back to step S1202. The MAC layer can re-indicate the RB set to the physical layer, which can be the switched RB set.

[0235] In step S1224, after the resource pool switching, the MAC layer can cancel the triggered continuous LBT failure of the old RB set.

[0236] If the LBT is successful on the new resource or RB set, the MAC layer can cancel the triggered continuous LBT failure on the old RB set. Or, if the data transmission is successful on the new resource or RB set, the MAC layer can cancel the triggered continuous LBT failure on the old RB set.

[0237] If the terminal device traverses all the configured RB sets and still fails to LBT or fails to send data, the RLF of the unicast link is triggered, and the continuous LBT failure on all triggered and uncancelled RB sets is cancelled.

[0238] If the terminal device has switched N times (reaching the configured number of times) and still fails to LBT or fails to send data, the RLF of all unicast links is triggered, and the continuous LBT failure on all triggered and uncancelled RB sets is cancelled.

[0239] If the terminal device is in the RRC connected state, the terminal device in the connected state can send the continuous LBT failure report, such as sending the continuous LBT failure report to the network device or the opposite terminal device. In addition, the terminal device sending the continuous LBT failure report can also trigger the cancellation operation of the continuous LBT failure. That is, the terminal device can trigger the cancellation operation of the continuous LBT failure in the case of resource switching, or can trigger the cancellation operation of the continuous LBT failure in the case of sending the continuous LBT failure report. Therefore, how to execute the two continuous LBT failure cancellation operations needs to be specified.

[0240] Based on this, the embodiment of the application proposes that the terminal device can trigger the cancel operation of continuous LBT failure after performing the above two operations. For example, for the continuous LBT failure on a certain triggered RB set, the terminal device can trigger the cancel operation of continuous LBT failure after sending the continuous LBT failure report on the RB set and performing the resource pool switching. Alternatively, the terminal device can trigger the cancel operation of continuous LBT failure after performing any one of the above two operations. For example, the terminal device can choose to send the continuous LBT failure report or switch the resource pool, and trigger the cancel operation of continuous LBT failure after performing the corresponding operation.

[0241] After triggering the cancel operation of continuous LBT failure, the MAC layer can indicate the cancel of continuous LBT failure or the RB set of canceling continuous LBT failure to the physical layer.

[0242] Example 3 Figure 13 It is shown that the continuous LBT failure occurs on the resource pool, and the resource switching strategy is to switch the resource pool set. For example, when a certain resource pool is marked as continuous LBT failure, the resource pool is replaced. When the RB set associated with a certain resource pool is indicated to have LBT failure, the counter corresponding to the resource pool is incremented by 1, and when the number of continuous LBT failures of the resource pool is greater than a preset threshold, the resource pool is replaced.

[0243] Referring to Figure 13 In step S1302, the MAC layer triggers resource selection or resource reselection. The MAC layer triggers the physical layer to perform resource selection, and at the same time, the MAC layer can send second indication information to the physical layer.

[0244] The second indication information can be used to indicate one or more of the following parameters: transmission data related information, currently available COT information, received IUC information, SL DRX information, target resource pool information, selected RB set information, etc. Among them, the transmission data related information can include one or more of the following information: required resource size, retransmission times, priority, etc. The available COT information can include COT time related information such as remaining duration, start time, end time, etc. The target resource pool information can be determined based on the RB set that has continuous LBT failure. The resource pool selected by the MAC layer needs to be associated with at least one RB set that has not triggered continuous LBT failure.

[0245] In step S1304, the physical layer performs resource selection. The physical layer can perform resource selection according to the second indication information, exclude unavailable resources, and obtain a set of available resources A.

[0246] If the second indication information indicates the target resource pool, the resource set A can be obtained based on the resources in the target resource pool; if the second indication information indicates the selected RB set, the resource set A can be obtained based on the resources in the selected RB set.

[0247] In step S1306, the physical layer reports the resource set A to the MAC layer.

[0248] In step S1308, the MAC layer performs resource selection according to the resource set A reported by the physical layer.

[0249] In step S1310, the MAC layer can send the selected resources, the data packets (such as MAC PDU) to be transmitted, and other transmission related information to the physical layer.

[0250] In step S1312, the physical layer can perform LBT detection on the resources selected by the MAC layer before data transmission. If the LBT is successful, the data is transmitted; if the LBT fails, step S1316 is performed.

[0251] In step S1314, the physical layer sends an LBT failure indication to the MAC layer.

[0252] Taking the RB set 1 as an example, if the RB set 1 is associated with multiple channels, the LBT failure indication of the RB set 1 can be sent in at least one of the following cases: all channels send LBT failure; at least one channel has LBT failure; the channel where the resource for data transmission is located has LBT failure. Specifically, in which case the LBT failure indication of the RB set 1 is sent, it is related to whether the terminal device is configured with a guard band. If the terminal device is configured with a guard band, the LBT failure indication of the RB set 1 can be sent in the case that all channels send LBT failure; if the terminal device is not configured with a guard band, the LBT failure indication of the RB set 1 can be sent in the case that at least one channel has LBT failure.

[0253] In step S1316, after the MAC layer receives the LBT failure indication, if the resource pool 1 timer is not started, the resource pool 1 timer is started; if the resource pool 1 timer is already started, the value of the resource pool 1 counter is incremented by 1.

[0254] In addition, the MAC layer can also trigger resource reselection. The resource reselection is triggered by LBT failure.

[0255] The MAC layer indicates the continuous LBT failure and / or the resource pool where the continuous LBT failure occurs to the physical layer.

[0256] In step S1318, when the resource pool 1 timer expires, it is judged whether the value of the resource pool 1 counter is greater than a preset threshold.

[0257] At step S1320, if the value of the resource pool 1 counter is greater than the preset threshold, it is determined that the resource pool 1 has a continuous LBT failure.

[0258] At step S1322, if the value of the resource pool 1 counter does not reach the preset threshold when the resource pool 1 timer expires, the resource pool 1 counter is set to zero.

[0259] If the resource pool 1 has a continuous LBT failure, the MAC layer triggers resource pool switching or new resource selection. For example, it can be re-executed back to step S1302. The MAC layer can re-indicate the resource pool to the physical layer, which can be the switched resource pool.

[0260] At step S1324, after the resource pool switching, the MAC layer can cancel the triggered continuous LBT failure of the old resource pool.

[0261] If the LBT is successful on the new resource or resource pool, the MAC layer can cancel the triggered continuous LBT failure on the old resource pool. Alternatively, if the data transmission is successful on the new resource or resource pool, the MAC layer can cancel the triggered continuous LBT failure on the old resource pool.

[0262] If the terminal device has traversed all the configured resource pools and still has not LBT success or data transmission success, the RLF of the unicast link is triggered, and the continuous LBT failure on all triggered and not cancelled resource pools is cancelled.

[0263] If the terminal device has switched N times (reaching the configured number of times) and still has not LBT success or data transmission success, the RLF of all unicast links is triggered, and the continuous LBT failure on all triggered and not cancelled resource pools is cancelled.

[0264] If the terminal device is in the RRC connected state, the terminal device in the connected state can send a continuous LBT failure report, such as sending a continuous LBT failure report to a network device or a peer device. In addition, the terminal device sending a continuous LBT failure report can also trigger the cancellation operation of the continuous LBT failure. That is, the terminal device can trigger the cancellation operation of the continuous LBT failure in the case of resource switching, or can trigger the cancellation operation of the continuous LBT failure in the case of sending a continuous LBT failure report. Therefore, it is necessary to specify how to perform the cancellation operation of the two continuous LBT failures.

[0265] Based on this, the embodiment of the present application proposes that the terminal device can trigger the cancellation operation of continuous LBT failure only after performing the above two operations. For example, for the continuous LBT failure of a certain triggered resource pool, the terminal device can trigger the cancellation operation of continuous LBT failure only after sending the continuous LBT failure report of the resource pool and performing the resource pool switching. Alternatively, the terminal device can trigger the cancellation operation of continuous LBT failure after performing any one of the above two operations. For example, the terminal device can choose to send the continuous LBT failure report or switch the resource pool, and trigger the cancellation operation of continuous LBT failure after performing the corresponding operation.

[0266] After triggering the cancellation operation of continuous LBT failure, the MAC layer can indicate the cancellation of continuous LBT failure or the resource pool of canceling continuous LBT failure to the physical layer.

[0267] The method embodiment of the present application is described in detail above, and the device embodiment of the present application is described in detail below. Figures 1 to 13 , the description of the method embodiment and the description of the device embodiment correspond to each other, therefore, the parts not described in detail can be referred to the method embodiment. Figures 14 to 15 , the description of the method embodiment and the description of the device embodiment correspond to each other, therefore, the parts not described in detail can be referred to the method embodiment.

[0268] Figure 14 is a schematic block diagram of a terminal device provided by the embodiment of the present application. Figure 14 The terminal device 1400 shown can be any one of the terminal devices described above. The terminal device 1400 can include a determination unit 1410.

[0269] The determination unit 1410 is configured to determine a first strategy related to continuous Listen-Before-Talk (LBT) failure, wherein the detection of the continuous LBT failure is related to a resource granularity.

[0270] In some embodiments, the resource granularity includes a resource block (RB) set and / or a resource pool.

[0271] In some embodiments, the first strategy includes one or more of the following: a resource switching strategy, a second strategy related to canceling a triggered continuous LBT failure, and a third strategy related to determining a continuous LBT failure.

[0272] In some embodiments, the resource switching strategy includes one or more of the following: switching a resource pool, switching an RB set, and switching a time-frequency resource.

[0273] In some embodiments, the resource switching policy comprises switching a resource pool, and the terminal device further comprises a switching unit configured to switch the resource pool when a first condition is met, the first condition being related to one or more of the following: whether the RB set associated with the current resource pool has experienced continuous LBT failure; a transmission requirement of the data.

[0274] In some embodiments, the first condition comprises one or more of the following: all RB sets associated with the current resource pool have experienced continuous LBT failure; a number of remaining resources in the resource pool is less than or equal to a preset threshold, wherein the remaining resources belong to resources that have not experienced continuous LBT failure and / or resources that meet the transmission requirement of the data.

[0275] In some embodiments, the remaining resources comprise time-frequency resources and / or RB sets.

[0276] In some embodiments, the resource switching policy comprises switching an RB set or switching time-frequency resources, and the terminal device further comprises a switching unit configured to switch the RB set or switch the time-frequency resources when the current RB set has experienced continuous LBT failure.

[0277] In some embodiments, the continuous LBT failure occurs on the RB set.

[0278] In some embodiments, the resource switching policy comprises switching a resource pool or switching time-frequency resources.

[0279] In some embodiments, the terminal device further comprises a switching unit configured to switch the resource pool or switch the time-frequency resources when the current resource pool has experienced continuous LBT failure.

[0280] In some embodiments, the continuous LBT failure occurs on the resource pool.

[0281] In some embodiments, the second policy comprises canceling the triggered continuous LBT failure of the first resource when a second condition is met, the second condition comprising one or more of the following: the terminal device performs a first operation related to resource switching; the terminal device sends a continuous LBT failure report.

[0282] In some embodiments, the terminal device sending a continuous LBT failure report comprises one or more of the following: the terminal device sends the continuous LBT failure to a peer terminal device; the terminal device sends the continuous LBT failure to a network device.

[0283] In some embodiments, the first operation comprises one or more of the following: resource switching is performed; LBT is successful in the switched resource; data is successfully sent in the switched resource; RLF of a unicast link is triggered.

[0284] In some embodiments, the radio link failure (RLF) of the unicast link is triggered comprises one or more of: no LBT success of a target resource after handover; the target resource after handover has triggered continuous LBT failure; no data transmission success on the target resource after handover; wherein the target resource is all resources configured or a preset number of resources.

[0285] In some embodiments, the target resource comprises a resource pool and / or a RB set.

[0286] In some embodiments, if the second condition comprises that the RLF of the unicast link is triggered, the first resource comprises the target resource.

[0287] In some embodiments, the first resource comprises one or more of: a RB set associated with one or more resource pools before handover; one or more RB sets before handover; one or more resource pools before handover.

[0288] In some embodiments, if the first condition comprises that the terminal device sends a continuous LBT failure report, the first resource comprises a resource corresponding to the sent continuous LBT failure.

[0289] In some embodiments, the terminal device further comprises: a sending unit, configured to send first indication information from a MAC layer to a physical layer of the terminal device, the first indication information being used to indicate continuous LBT failure cancellation and / or a resource for cancelling continuous LBT failure.

[0290] In some embodiments, the third strategy comprises: within a first preset time length, if a number of LBT failures of a first RB set reaches a first preset threshold, determining that the first RB set has continuous LBT failure; or the third strategy comprises: within a second preset time length, if a number of LBT failures of an RB set associated with a first resource pool reaches a second preset threshold, determining that the first resource pool has continuous LBT failure.

[0291] In some embodiments, the LBT failure of the first RB set is related to second information, and the second information comprises one or more of: all channels associated with the first RB set have LBT failure; at least one channel associated with the first RB set has LBT failure; a channel where a resource for data transmission is located has LBT failure.

[0292] In some embodiments, the second information is related to whether the terminal device is configured with a guard band.

[0293] In some embodiments, the selected resource for the terminal device to perform data transmission is determined based on second indication information, the second indication information being used to indicate one or more of the following parameters: information of a target resource pool, the target resource pool information being determined based on information related to continuous LBT failure; information related to a target RB set.

[0294] In some embodiments, the target RB set comprises one or more of the following: a selected RB set; an RB set where continuous LBT failure occurs.

[0295] In some embodiments, the selected RB set does not contain an RB set where continuous LBT failure occurs.

[0296] In some embodiments, the target resource pool is associated with at least one RB set or resource pool that does not trigger continuous LBT failure; and / or the target resource pool contains at least one resource pool that does not trigger continuous LBT failure.

[0297] In some embodiments, the selected resource is sent by a MAC layer of the terminal device to a physical layer of the terminal device, the selected resource being determined by the MAC layer based on a second resource, the second resource being determined by the physical layer based on resource selection of the second indication information.

[0298] In some embodiments, the second resource is determined based on one or more of the following resources: resources in the target resource pool; resources within the selected RB set; resources excluded from where continuous LBT failure occurs.

[0299] Figure 15 is a schematic structural diagram of a communication device of an embodiment of the present application. Figure 15 The dashed line in indicates that the unit or module is optional. The device 1500 can be used to implement the methods described in the above method embodiments. The device 1500 can be a chip, a terminal device.

[0300] The apparatus 1500 can include one or more processors 1510. The processor 1510 can support the apparatus 1500 to implement the methods described in the foregoing method embodiments. The processor 1510 can be a general purpose processor or a dedicated processor. For example, the processor can be a central processing unit (CPU). Alternatively, the processor can also be other general purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The general purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0301] The apparatus 1500 can further include one or more memories 1520. The memory 1520 stores a program, which can be executed by the processor 1510, so that the processor 1510 performs the methods described in the foregoing method embodiments. The memory 1520 can be independent of the processor 1510 or integrated in the processor 1510.

[0302] The apparatus 1500 can further include a transceiver 1530. The processor 1510 can communicate with other devices or chips through the transceiver 1530. For example, the processor 1510 can perform data transceiving with other devices or chips through the transceiver 1530.

[0303] The embodiments of the present application further provide a computer readable storage medium for storing a program. The computer readable storage medium can be applied to the terminal device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the terminal device in the embodiments of the present application.

[0304] The embodiments of the present application further provide a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the terminal device in the embodiments of the present application.

[0305] The embodiments of the present application further provide a computer program. The computer program can be applied to the terminal device provided by the embodiments of the present application, and the computer program causes the computer to execute the method performed by the terminal device in the embodiments of the present application.

[0306] It should be understood that the terms "system" and "network" can be used interchangeably in this application. In addition, the terms used in this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of this application and the drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0307] In embodiments of the present application, the term "indicate" can be direct indication or indirect indication, or can represent an associated relationship. For example, A indicates B, which can mean that B can be obtained by A; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0308] In embodiments of the present application, the term "include" can mean direct inclusion or indirect inclusion. Alternatively, the term "include" mentioned in embodiments of the present application can be replaced by "indicate" or "for determining". For example, A includes B can be replaced by A indicates B, or A is for determining B.

[0309] In embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0310] In embodiments of the present application, the term "corresponding" can represent a direct or indirect corresponding relationship between the two, or can represent an associated relationship between the two, or can mean an indication and being indicated, configuration and being configured, etc.

[0311] In embodiments of the present application, "predefined" or "preconfigured" can be implemented by pre-saving corresponding codes, tables or other information that can be used to indicate related information in devices (for example, including terminal devices and network devices), and the specific implementation manner of the present application is not limited. For example, predefinition can mean definition in a protocol.

[0312] In embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, which can include, for example, an LTE protocol, an NR protocol, and a related protocol applied to a future communication system, and the present application is not limited thereto.

[0313] The term "and / or" in the embodiments of the present application is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.

[0314] In various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0315] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other ways. For example, the device embodiments described above are only schematic, and for example, the division of the units is only a logical function division, and there can be another division way in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between each other can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0316] The units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiments of the present application.

[0317] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit.

[0318] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server, data center and the like integrated with one or more available media sets. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, digital video disc (DVD)) or semiconductor media (for example, solid state disk (SSD)) and the like.

[0319] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for wireless communication, characterized in that, include: The terminal device performs a first operation related to consecutive Listen-Before-Speak (LBT) failures, wherein the detection of consecutive LBT failures is related to resource granularity.

2. The method according to claim 1, characterized in that, The resource granularity includes resource block (RB) sets and / or resource pools.

3. The method according to claim 1 or 2, characterized in that, The first operation includes one or more of the following: a resource switching operation, a second operation related to canceling a triggered consecutive LBT failure, and a third operation related to determining a consecutive LBT failure. The resource switching operation includes one or more of the following: switching resource pools, switching RB sets, and switching time-frequency resources.

4. The method according to claim 3, characterized in that, The resource switching operation includes switching resource pools, and the method further includes: The terminal device switches resource pools when a first condition is met, where the first condition is related to one or more of the following information: Has consecutive LBT failure occurred in the RB set? Data transmission requirements The first condition includes one or more of the following: All RB sets associated with the current resource pool have experienced consecutive LBT failures; The number of remaining resources in the resource pool is less than or equal to a preset threshold, wherein the remaining resources are resources that have not experienced consecutive LBT failures and / or resources that meet the data transmission requirements, or The resource switching operation includes switching RB sets or switching time-frequency resources, and the method further includes: If the terminal device experiences consecutive LBT failures in the current RB set, it switches the RB set or switches the time-frequency resources.

5. The method according to claim 3, characterized in that, The second operation includes: canceling the triggered continuous LBT failure of the first resource if a second condition is met, wherein the second condition includes: The terminal device sent consecutive LBT failure reports. The terminal device sent continuous LBT failure reports including: The terminal device sent a series of LBT failures to the network device.

6. The method according to claim 5, characterized in that, The method further includes: The MAC layer of the terminal device sends a first indication message to the physical layer of the terminal device. The first indication message is used to indicate that resources with consecutive LBT failures should be cancelled and / or cancelled. The third operation includes: if the number of LBT failures in the first RB set reaches a first preset threshold within a first preset time period, then it is determined that the first RB set has experienced consecutive LBT failures.

7. The method according to any one of claims 1-6, characterized in that, The selected resources for data transmission by the terminal device are determined based on second indication information, which indicates one or more of the following parameters: Information about the target resource pool, which is determined based on information related to consecutive LBT failures; Information related to the target RB set, The target RB set includes: The set of RBs where consecutive LBT failures occur.

8. The method according to claim 7, characterized in that, The target resource pool is associated with at least one RB set or resource pool that has not triggered consecutive LBT failures; and / or The target resource pool contains at least one resource pool that has not triggered consecutive LBT failures.

9. The method according to claim 7 or 8, characterized in that, The selected resource is sent from the MAC layer of the terminal device to the physical layer of the terminal device. The selected resource is determined by the MAC layer based on a second resource, and the second resource is determined by the physical layer based on the second indication information. The second resource is determined based on one or more of the following resources: Resources in the target resource pool; Resources that experienced consecutive LBT failures were excluded.

10. A terminal device, characterized in that, include: A determination unit is used to perform a first operation related to consecutive Listen-Before-Speak (LBT) failures, wherein the detection of consecutive LBT failures is related to resource granularity.

11. The terminal device according to claim 10, characterized in that, The resource granularity includes resource block (RB) sets and / or resource pools.

12. The terminal device according to claim 10 or 11, characterized in that, The first operation includes one or more of the following: a resource switching operation, a second operation related to canceling triggered consecutive LBT failures, and a third operation related to determining consecutive LBT failures. The resource switching operation includes one or more of the following: switching resource pools, switching RB sets, and switching time-frequency resources.

13. The terminal device according to claim 12, characterized in that, The resource switching operation includes switching resource pools, and the terminal device further includes: A switching unit is configured to switch resource pools when a first condition is met, wherein the first condition is related to one or more of the following information: Has consecutive LBT failure occurred in the RB set? Data transmission requirements The first condition includes one or more of the following: All RB sets associated with the current resource pool have experienced consecutive LBT failures; The number of remaining resources in the resource pool is less than or equal to a preset threshold, wherein the remaining resources are resources that have not experienced consecutive LBT failures and / or resources that meet the data transmission requirements, or The resource switching operation includes switching RB sets or switching time-frequency resources, and the terminal device further includes: The switching unit is used to switch the RB set or switch the time-frequency resources in the event of consecutive LBT failures in the current RB set.

14. The terminal device according to claim 12, characterized in that, The second operation includes: canceling the triggered continuous LBT failure of the first resource if a second condition is met, wherein the second condition includes: The terminal device sent consecutive LBT failure reports. The terminal device sent continuous LBT failure reports including: The terminal device sent a series of LBT failures to the network device.

15. The terminal device according to claim 14, characterized in that, The terminal device also includes: The sending unit is configured to send first indication information from the MAC layer to the physical layer of the terminal device. The first indication information is used to indicate the cancellation of resources that have experienced consecutive LBT failures. The third operation includes: if the number of LBT failures in the first RB set reaches a first preset threshold within a first preset time period, then it is determined that the first RB set has experienced consecutive LBT failures.

16. The terminal device according to any one of claims 10-15, characterized in that, The selected resources for data transmission by the terminal device are determined based on second indication information, which indicates one or more of the following parameters: Information about the target resource pool, which is determined based on information related to consecutive LBT failures; Information related to the target RB set, The target RB set includes: The set of RBs where consecutive LBT failures occur.

17. The terminal device according to claim 16, characterized in that, The target resource pool is associated with at least one RB set or resource pool that has not triggered consecutive LBT failures; and / or The target resource pool contains at least one resource pool that has not triggered consecutive LBT failures.

18. The terminal device according to claim 16 or 17, characterized in that, The selected resource is sent from the MAC layer of the terminal device to the physical layer of the terminal device. The selected resource is determined by the MAC layer based on a second resource, and the second resource is determined by the physical layer based on the second indication information. The second resource is determined based on one or more of the following resources: Resources in the target resource pool; Resources that experienced consecutive LBT failures were excluded.

19. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method as described in any one of claims 1-9.

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