Sidelink communication method and terminal device

Abstract

Provided are a sidelink communication method and a terminal device. The method comprises: a first terminal device sends first information to a second terminal device by means of a first carrier; and the first terminal device receives or sends second information by means of a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information. Compared with a conventional solution in which first information and second information need to be transmitted by means of the same carrier, embodiments of the present application in which the first information and the second information can be transmitted by means of different carriers (such as the first carrier and the second carrier) help to improve the flexibility of the transmission of the first information and the second information.

Description

Sideline communication method and terminal equipment Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a sideline communication method and terminal device. Background Art

[0002] Currently, when transmitting first information and second information associated with the first information between a first terminal device and a second terminal device, the first information and the second information need to be transmitted through the same carrier, resulting in poor flexibility in the transmission method of the first information and the second information.

[0003] Summary of the Invention

[0004] The present application provides a sideline communication method and terminal device. The following introduces various aspects of the present application.

[0005] In a first aspect, a sideline communication method is provided, comprising: a first terminal device sends first information to a second terminal device via a first carrier; the first terminal device receives or sends second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

[0006] In a second aspect, a sideline communication method is provided, comprising: a second terminal device receives first information sent by a first terminal device through a first carrier; the second terminal device receives or sends second information through a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

[0007] According to a third aspect, a terminal device is provided, which is a first terminal device and includes: a communication unit for sending first information to a second terminal device via a first carrier; and a communication unit for receiving or sending second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

[0008] In a fourth aspect, a terminal device is provided, which is a second terminal device, including: a communication unit for receiving first information sent by a first terminal device through a first carrier; a communication unit for receiving or sending second information through a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

[0009] In a fifth aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer programs in the memory so that the terminal device executes some or all of the steps in the methods of the above aspects.

[0010] In a sixth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device. In another possible design, the system may also include other devices that interact with the terminal device in the solution provided in the embodiment of the present application, such as a network device.

[0011] In the seventh aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a terminal device or a network device) to perform some or all of the steps in the methods of the above aspects.

[0012] In an eighth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device (e.g., a terminal device or a network device) to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0013] In a ninth aspect, an embodiment of the present application provides a chip comprising a memory and a processor, wherein the processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0014] In an embodiment of the present application, the first information and the second information can be transmitted through different carriers (for example, the first carrier and the second carrier). Compared with the traditional solution in which the first information and the second information need to be transmitted through the same carrier, this helps to improve the flexibility of transmitting the first information and the second information. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0016] FIG2 is an example diagram of a side communication scenario within network coverage.

[0017] FIG3 is an example diagram of a side communication scenario with partial network coverage.

[0018] FIG4 is an example diagram of a side communication scenario outside network coverage.

[0019] FIG5 is a diagram showing an example of a side communication scenario based on a central control node.

[0020] FIG6 is an example diagram of a sideline communication method based on broadcasting.

[0021] FIG7 is an example diagram of a unicast-based sideline communication method.

[0022] FIG8 is an example diagram of a side communication method based on multicast.

[0023] FIG9 is a schematic flowchart of a sideline communication method according to an embodiment of the present application.

[0024] FIG10 is a schematic flowchart of a method for configuring a carrier according to an embodiment of the present application.

[0025] FIG11 is a schematic diagram of a terminal device according to an embodiment of the present application.

[0026] FIG12 is a schematic diagram of a terminal device according to another embodiment of the present application.

[0027] FIG13 is a schematic structural diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solution in this application will be described below with reference to the accompanying drawings.

[0029] Communication system architecture

[0030] FIG1 is a diagram illustrating an exemplary system architecture of a wireless communication system 100 to which embodiments of the present application may be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0031] FIG1 exemplarily shows a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and / or one or more terminal devices 120. For a network device 110, the one or more terminal devices 120 may all be located within the network coverage of the network device 110, or all be located outside the network coverage of the network device 110, or some may be located within the coverage of the network device 110 and others outside the network coverage of the network device 110. This is not limited in the embodiments of the present application.

[0032] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0033] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0034] The terminal device in the embodiment of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal device, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer (Pad), a laptop computer, a PDA, 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, etc. For example, a terminal device can act as a dispatching entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, a cell phone and a car can communicate with each other using sidelink signals. A cell phone and a smart home device can also communicate without relaying the communication signal through a base station. Alternatively, the terminal device can be used to act as a base station.

[0035] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary 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. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned device or apparatus. A base station may also be a mobile switching center and a device that performs base station functions in device-to-device D2D, V2X, or machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by network devices.

[0036] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0037] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0038] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0039] Sideline communication under different network coverage conditions

[0040] Sidelink communication refers to a communication technology based on a sidelink. Sidelink communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. In traditional cellular systems, communication data is received or sent between terminal devices and network devices, while sidelink communication supports direct communication and data transmission between terminal devices. Compared with traditional cellular communication, direct communication data transmission between terminal devices can have higher spectrum efficiency and lower transmission latency. For example, the vehicle networking system adopts sidelink communication technology.

[0041] In side communication, according to the network coverage of the terminal device, the side communication can be divided into side communication within the network coverage, side communication with partial network coverage, and side communication outside the network coverage.

[0042] Figure 2 illustrates an example scenario for sidelink communication within network coverage. In the scenario shown in Figure 2, both terminal devices 120a are within the coverage of network device 110. Therefore, both terminal devices 120a can receive configuration signaling from network device 110 (configuration signaling in this application can also be replaced by configuration information) and determine the sidelink configuration based on the configuration signaling from network device 110. After both terminal devices 120a have configured their sidelinks, sidelink communication can proceed on the sidelink.

[0043] Figure 3 is an example diagram of a sidelink communication scenario with partial network coverage. In the scenario shown in Figure 3, terminal device 120a performs sidelink communication with terminal device 120b. Terminal device 120a is located within the coverage range of network device 110, so terminal device 120a can receive the configuration signaling of network device 110 and determine the sidelink configuration based on the configuration signaling of network device 110. Terminal device 120b is located outside the network coverage and cannot receive the configuration signaling of network device 110. In this case, terminal device 120b can determine the sidelink configuration based on pre-configuration information and / or information carried in the physical sidelink broadcast channel (PSBCH) sent by terminal device 120a within the network coverage. After both terminal device 120a and terminal device 120b perform sidelink configuration, sidelink communication can be performed on the sidelink.

[0044] Figure 4 illustrates an example scenario for sidelink communication outside of network coverage. In the scenario shown in Figure 4, both terminal devices 120b are outside of network coverage. In this scenario, both terminal devices 120b can determine the sidelink configuration based on pre-configured information. After both terminal devices 120b have configured their sidelinks, sidelink communication can proceed over the sidelink.

[0045] Sideline communication based on central control node

[0046] Figure 5 is an example diagram of a sideline communication scenario based on a central control node. In this sideline communication scenario, multiple terminal devices can form a communication group, and the communication group has a central control node. The central control node can be a terminal device in the communication group (such as terminal device 1 in Figure 5), and the terminal device can also be called a cluster head (CH) terminal device. The central control node can be responsible for completing one or more of the following functions: establishment of a communication group, joining and leaving of group members of the communication group, resource coordination within the communication group, allocation of sideline transmission resources to other terminal devices, receiving sideline fourth sideline data from other terminal devices, and resource coordination with other communication groups.

[0047] Sideline communication mode

[0048] Some standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two sideline communication modes: a first mode and a second mode.

[0049] In the first mode, the resources of the terminal device (the 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 send data on the side link according to the resources allocated by the network device. The network device can allocate resources for a single transmission to the terminal device, or it can allocate resources for semi-static transmission to the terminal device. This first mode can be applied to scenarios covered by a network device, such as the scenario shown in Figure 2 above. In the scenario shown in Figure 2, the terminal device 120a is within the network coverage of the network device 110, so the network device 110 can allocate resources used in the side transmission process to the terminal device 120a.

[0050] In the second mode, the terminal device can autonomously select one or more resources from a resource pool (RP). The terminal device can then perform side transmission based on the selected resources. For example, in the scenario shown in FIG4 , the terminal device 120b is located outside the cell coverage area. Therefore, the terminal device 120b can autonomously select resources from a pre-configured resource pool for side transmission. Alternatively, in the scenario shown in FIG2 , the terminal device 120a can also autonomously select one or more resources from a resource pool configured by the network device 110 for side transmission.

[0051] Data transmission method of side communication

[0052] Some sidewalk communication systems (such as long-term evolution vehicle to everything (LTE-V2X)) support broadcast-based data transmission (hereinafter referred to as broadcast transmission). For broadcast transmission, the receiving terminal can be any terminal device around the transmitting terminal. Taking Figure 6 as an example, terminal device 1 is the transmitting terminal, and the receiving terminal corresponding to the transmitting terminal is any terminal device around terminal device 1, for example, terminal device 2 to terminal device 6 in Figure 6.

[0053] In addition to broadcast transmission, some communication systems also support unicast-based data transmission (hereinafter referred to as unicast transmission) and / or multicast-based data transmission (hereinafter referred to as multicast transmission). For example, the new radio vehicle to everything (NR-V2X) hopes to support autonomous driving. Autonomous driving places 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 modes, etc. Therefore, in order to improve the performance of data interaction between vehicles, NR-V2X introduces unicast transmission and multicast transmission.

[0054] For unicast transmission, there is typically only one receiving terminal. For example, in Figure 7, unicast transmission occurs between terminal devices 1 and 2. Terminal device 1 can be the sending terminal, and terminal device 2 can be the receiving terminal, or vice versa.

[0055] For multicast transmission, the receiving terminal can be a terminal device within a communication group, or a terminal device within a certain transmission distance. For example, in Figure 8, terminal devices 1, 2, 3, and 4 form a communication group. If terminal device 1 sends data, all other terminal devices in the group (terminal devices 2 through 4) can be receiving terminals.

[0056] Carrier aggregation technology

[0057] To meet the requirements for single-user peak data rates and improved system capacity, one of the most direct approaches is to increase the system transmission bandwidth. Therefore, a bandwidth-enhancing technology, carrier aggregation (CA), has been introduced into communication systems. CA aggregates multiple (e.g., 2-5) component carriers (CCs) to increase transmission bandwidth, effectively boosting uplink and downlink transmission rates.

[0058] In some implementations, the CCs participating in the aggregation may be carriers that are adjacent in frequency band, or may be carriers that are not adjacent in frequency band.

[0059] In other implementations, CA technologies can be categorized based on the range of aggregated carriers. CA types can be divided into intra-band CA and inter-band CA (or inter-band CA). As the name implies, in intra-band CA, the CCs participating in carrier aggregation belong to the same frequency band. In inter-band CA, the CCs participating in carrier aggregation belong to multiple different frequency bands.

[0060] For ease of understanding, the following introduces CA technology using scenarios where network devices communicate with terminal devices, and sideline communication scenarios where terminal devices communicate with each other as examples.

[0061] In communications between network devices and end devices, CA is a bandwidth extension technology supported since the LTE-Advanced standard. It aggregates multiple CCs, allowing a single end device to receive or transmit simultaneously. In this scenario, intra-band CA can be used when the cell carrier bandwidth exceeds the bandwidth capability of a single end device. In this case, the end device can use CA to operate within a "wide carrier."

[0062] For example, the network device supports a 300MHz carrier, while the terminal device only supports a maximum of 100MHz carrier. At this time, in order to improve the transmission rate between the terminal device and the network device, the terminal device can use CA to communicate with the network device using a bandwidth greater than 100MHz.

[0063] In some scenarios, when a terminal device and a network device communicate based on CA, a primary cell (PCell) and a secondary cell (SCell) may be configured simultaneously. The secondary cell may include a primary secondary cell (PSCell). Currently, in known communication protocols (e.g., NR Release 15), a beam failure recovery mechanism is designed for PCell and PSCell. Its main functional modules (or main steps) can be divided into the following four: beam failure detection (BFD); new beam identification (NBI); beam failure recovery request (BFRQ); and network-side response.

[0064] That is to say, in the beam failure detection step, the terminal device can measure the physical downlink control channel (PDCCH) to determine the link quality corresponding to the downlink transmission beam. If the corresponding link quality is very poor, it is considered that the downlink beam has a beam failure. Then enter the new beam selection step, the terminal device can measure a set of alternative beams, and select a beam that meets a certain threshold from the alternative beams as a new beam. The terminal device then notifies the network device of the beam failure through the BFRQ process and reports the selected new beam. Accordingly, in the network side response step, after receiving the BFRQ information sent by the terminal device, the network device can know that the terminal device has a beam failure and choose to send PDCCH from the new beam. Then, the network device sends PDCCH to the terminal device on the new beam. Accordingly, after the terminal device receives the PDCCH on the new beam, it can be considered that the response information from the network side has been correctly received. At this point, the beam failure recovery process is successfully completed.

[0065] In a sideline communication scenario, when a terminal device communicates with other terminal devices in a broadcast or multicast manner, the terminal device can select the carrier set corresponding to the service to which the data to be transmitted belongs based on the pre-stored mapping relationship between the service type and the carrier set, and perform carrier aggregation based on the selected carrier set to communicate with other terminal devices.

[0066] In some implementations, the terminal device may determine the CC for carrier aggregation from the selected carrier set based on the channel-busy-ratio (CBR). For example, the terminal device may measure the CBR in the resource pool and compare it with the CBR threshold corresponding to the priority of the data to be transmitted. If the measured CBR value is lower than the CBR threshold, the terminal device may consider the carrier to be applicable for carrier aggregation. Conversely, if the measured CBR value is higher than or equal to the CBR threshold, the terminal device may consider the carrier to be unavailable for carrier aggregation.

[0067] Cross-carrier scheduling

[0068] Currently, cross-carrier scheduling is supported in communication scenarios between network devices and terminal devices. This means that cross-carrier scheduling with a carrier indication field (CIF) allows the PDCCH of one serving cell to schedule resources of another serving cell, but with the following restrictions.

[0069] Constraint 1: PCell cannot use cross-carrier scheduling, that is, PCell is always scheduled through its own PDCCH.

[0070] Constraint 2: If a PDCCH is configured for an SCell, the physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) of this cell are always scheduled through the PDCCH of this SCell.

[0071] Constraint 3: If a SCell is not configured with a PDCCH, the PDSCH and PUSCH of this SCell are always scheduled through the PDCCH of another serving cell.

[0072] Typically, a scheduling PDCCH and the scheduled PDSCH / PUSCH can use the same or different sub-carrier spacing (SCS). Prior to R16, cross-carrier scheduling supported the same sub-carrier spacing for the scheduling PDCCH and the scheduled PDSCH / PUSCH, but R16 no longer has this restriction and supports the same or different sub-carrier spacing configurations.

[0073] Currently, when transmitting first information and second information associated with the first information between a first terminal device and a second terminal device, the first information and the second information need to be transmitted through the same carrier, resulting in poor flexibility in the transmission method of the first information and the second information.

[0074] Taking the example where the first information is side data and the second information is feedback information for the side data, if the first terminal device sends side data to the second terminal device, the second terminal device also needs to send feedback information to the first terminal device through the first carrier, resulting in poor flexibility in the transmission method of the side data and feedback information.

[0075] In other scenarios, if the first terminal device sends multiple side data through multiple carriers, the receiving end of the multiple side data needs to send feedback information for the side data to the first terminal device respectively through the carriers that transmit the multiple side data, resulting in higher power consumption of the first terminal device.

[0076] For example, a first terminal device sends sideline data 1 to a second terminal device via carrier 1, and sends sideline data 2 to a third terminal device via carrier 2. Accordingly, the second terminal device needs to send feedback information of sideline data 1 to the first device via carrier 1, and the third terminal device needs to send feedback information of sideline data 2 to the first device via carrier 2. In this way, the first terminal device needs to receive feedback information on both carrier 1 and carrier 2, resulting in high power consumption of the first terminal device.

[0077] Taking the case where the second information is sidelink data and the first information is sidelink control information used to schedule the sidelink data as an example, if the first terminal device sends sidelink control information to the second terminal device via the first carrier, the second terminal device also needs to send data information to the first terminal device via the first carrier, resulting in poor flexibility in the transmission method of the sidelink data and the sidelink control information.

[0078] In other scenarios, if the first terminal device sends multiple side control information through multiple carriers, the receiving end of the side control information (including the second terminal device) needs to send side data to the first terminal device through the carrier that transmits the side control information, resulting in higher power consumption of the first terminal device.

[0079] For example, a first terminal device sends sidelink control information 1 to a second terminal device via carrier 1, and sends sidelink control information 2 to a third terminal device via carrier 2. Accordingly, the second terminal device needs to send sidelink data 1 scheduled by sidelink control information 1 to the first device via carrier 1, and the third terminal device needs to send sidelink data 2 scheduled by sidelink control information 2 to the first device via carrier 2. Thus, the first terminal device needs to receive sidelink data 1 and sidelink data 2 on carrier 1 and carrier 2, respectively, resulting in higher power consumption for the first terminal device.

[0080] Therefore, to address the above issues, an embodiment of the present application provides a sideline communication method, in which the first information and the second information can be transmitted via different carriers (e.g., the first carrier and the second carrier), which helps to improve the flexibility of the transmission of the first information and the second information. For ease of understanding, the sideline communication method of an embodiment of the present application is described below in conjunction with Figure 9. The method shown in Figure 9 includes steps S910 to S920.

[0081] In step S910, a first terminal device sends first information to a second terminal device via a first carrier.

[0082] In step S920, the first terminal device receives or sends second information through a second carrier, where the first carrier is different from the second carrier.

[0083] In some implementations, the second information is associated with the first information. For example, the first information may include sideline data, and the second information may include feedback information regarding the sideline data. The feedback information regarding the sideline data may be used to indicate whether the second terminal device successfully received the sideline data. For another example, the first information may include sideline control information, and the second information may include sideline data scheduled by the sideline control information. The sideline control information may be used to schedule sideline resources for the sideline data. This will be described below in conjunction with Examples 1 and 2.

[0084] In some implementations, if the first terminal device receives the second information via the second carrier, the second information may be sent by the second terminal device. In other implementations, if the first terminal device sends the second information via the second carrier, the second information may be sent by the first terminal device to the second terminal device. For ease of understanding, the following will be introduced in conjunction with Examples 1 to 3. Among them, Example 1 mainly introduces the scheme in which the second terminal device sends the second information to the first terminal device. Examples 2 to 3 mainly introduce the scheme in which the first terminal device sends the second information to the second terminal device.

[0085] Example 1: Assume that the first information includes sidelink data, and the second information includes feedback information for the sidelink data, or in other words, the first information is carried on a first physical sidelink control channel (PSSCH), and the second information is carried on a first physical sidelink feedback channel (PSFCH) associated with the first PSSCH.

[0086] It should be noted that the side data involved in the embodiments of the present application may be initially transmitted data or retransmitted data, and the embodiments of the present application do not limit this.

[0087] As described above, the first information and the second information can be transmitted via different carriers. Therefore, determining the second carrier used to transmit the second information is an urgent issue. Therefore, in response to this issue, an embodiment of the present application proposes that the second carrier can be determined based on some information shared by the first terminal device and the second terminal device (hereinafter referred to as "third information").

[0088] That is to say, the second carrier can be determined based on the third information, wherein the third information includes one or more of the following: information on the target service type, information on the target service, information on the target application type, information on the target application, layer 2 information, sending configuration, information on the target QoS flow, and data transmission type.

[0089] Taking the third information including the target service type as an example, the target service type may be the service type of the service to which the sidelink data belongs. The target service type may include, for example, a rate-priority service type, a reliability-priority service type, etc., which is not limited in this embodiment of the present application.

[0090] In some implementations, the target service type information may be used to indicate the target service type. For example, the target service type information may be an index of the target service type.

[0091] Taking the example where the third information includes information about a target service, the target service may be, for example, a service to which the sidelink data belongs. In some implementations, the information about the target service is used to indicate the target service, for example, the information about the target service may be an index of the target service.

[0092] Taking the example where the third information includes information about the target application type, the target application type may be the application type of the application to which the sidelink data belongs. In some implementations, the information about the target application type may be used to indicate the target application type, for example, the information about the target application type may be an index of the target application type.

[0093] Taking the example where the third information includes information about the target application, the target application may be, for example, the application type of the application to which the sidelink data belongs. In some implementations, the information about the target application may be used to indicate the target application, for example, the information about the target application may be an index of the target application.

[0094] Taking the example that the third information includes layer 2 information, the layer 2 information may be associated with sidelink data, and in some implementations, the communication device that transmits the sidelink data via layer 2, for example, the layer 2 information may include a layer 2 index.

[0095] Taking the example of the third information including transmission configuration (Tx profile), the transmission configuration information may be associated with sideline data. In some implementations, the transmission configuration information may be used to indicate the transmission configuration of the sideline data. For example, the transmission configuration may include information indicating the transmission configuration. For another example, the transmission configuration may include transmission configuration parameters of the first information.

[0096] Taking the example where the third information includes information about a target quality of service (QoS) flow, the target QoS flow may be, for example, a QoS flow where sidelink data resides. In some implementations, the information about the target QoS flow may be used to indicate the target QoS flow. For example, the information about the target QoS flow may include an identifier of the target QoS flow.

[0097] For example, if the third information includes information about a data transmission type, the data transmission type may be, for example, a data transmission type for sidelink data, where the data transmission type may include one or more of unicast, multicast, and broadcast. In some implementations, the data transmission type information may be used to indicate the data transmission type. For example, the data transmission type information may include an identifier for the data transmission type.

[0098] In some implementations, the second carrier is determined based on a first association between the second carrier and the third information. That is, by establishing an association between the carrier and the third information, the carrier associated with the third information of the first terminal device can be determined, where the carrier associated with the third information of the first terminal device is the second carrier.

[0099] In some implementations, the first association may be an association between the third information and carrier indication information, where the carrier indication information may be a carrier index, a carrier sequence number, or the like. Taking the example of the third information including target service type information, the first association may include an association between the target service type information and the carrier indication information. Taking the example of the third information including target service information, the first association may include an association between the target service information and the carrier indication information. Taking the example of the third information including target application type information, the first association may include an association between the target application type information and the carrier indication information. Taking the example of the third information including layer 2 information, the first association may include an association between the layer 2 information and the carrier indication information. Taking the example of the third information including transmission configuration, the first association may include an association between the transmission configuration and the carrier indication information. Taking the example of the third information including target QoS flow information, the first association may include an association between the target QoS flow information and the carrier indication information. Taking the example of the third information including data transmission type, the first association may include an association between the data transmission type and the carrier indication information.

[0100] It should be noted that the carrier associated with the third information in the first association relationship may be one or more available carriers. That is, the third information in the first association relationship may be associated with a carrier set, which may include one or more available carriers. For example, the second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, where the first carrier set includes one or more carriers that can be used to transmit the second information.

[0101] In addition, in the embodiment of the present application, the available carrier associated with the third information of the first terminal device may include a carrier carrying the second information (feedback information), that is, a second carrier. In this case, the carrier carrying the feedback information is also called a "feedback carrier."

[0102] In some implementations, the first association relationship may be defined by an upper layer of the first terminal device and / or the second terminal device, or in other words, the first association relationship may be applied to an upper layer of the first terminal device and / or the second terminal device. For example, the first association relationship may be defined by a NAS layer. For another example, the first association relationship may be defined by a V2X layer. For another example, the first association relationship may be defined by a proximity based services (ProSe) layer.

[0103] It should be noted that the first carrier can be determined based on the association relationship between the third information and the first carrier. The way of establishing the association relationship is similar to the way of establishing the first association relationship above. For the sake of brevity, it will not be repeated here.

[0104] In some scenarios, after determining the available carrier for the second information, it is also necessary to determine the sidelink resources (or the time-frequency resources for transmitting the second information) and / or the second carrier for transmitting the second information. In some implementations, the time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, and the second resource pool and / or the second carrier are determined based on the fourth information.

[0105] In some implementations, the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool, information about the target wireless bearer, target data priority, congestion level of the first resource pool, and predefined information.

[0106] For example, if the fourth information includes information about the first carrier, the first carrier is a carrier used to transmit sidelink data. Therefore, the first carrier can also be referred to as a "data transmission carrier." In some implementations, the information about the first carrier can be used to indicate the first carrier. For example, the information about the first carrier can be the sequence number of the first carrier.

[0107] Taking the fourth information including information about a logical channel as an example, the logical channel may be, for example, a logical channel where sidelink data resides. In some implementations, the information about the logical channel may be used to indicate the logical channel. For example, the information about the logical channel may include an identifier of the logical channel.

[0108] Taking the example where the fourth information includes information about the first resource pool, the first resource pool may be, for example, a resource pool for transmitting sideline data. In some implementations, the information about the first resource pool may be used to indicate the first resource pool. For example, the information about the first resource pool may include an identifier of the first resource pool.

[0109] Taking the example where the fourth information includes information about a target radio bearer, the target radio bearer may be, for example, a radio bearer used to transmit sidelink data. In some implementations, the information about the target radio bearer may be used to indicate the target radio bearer. For example, the information about the target radio bearer may include an identifier of the target radio bearer.

[0110] Taking the example of the fourth information including information on target data priority, the target data priority may be, for example, the data priority of the sideline data. In some implementations, the target data priority information may be used to indicate the data priority of the sideline data. For example, the target data priority information may include a level of the target data priority. For another example, the target data priority information may include an identifier of the target data priority.

[0111] Taking the example where the fourth information includes the congestion level of the first resource pool, the first resource pool may be a resource pool for transmitting sidelink data. In some implementations, the congestion level of the first resource pool may be determined by the CBR in the first resource pool.

[0112] Taking the fourth information including predefined information as an example, in some implementations, the predefined information may be used to indicate one or more available carriers, where an available carrier may be understood as a carrier that can be used to transmit sideline data. In other implementations, the predefined information may be used to indicate one or more available resource pools, where an available resource pool may be understood as a resource pool that can be used to transmit sideline data.

[0113] It should be noted that the above predefined information can be replaced by preconfigured information, wherein the preconfigured information can be preconfigured by the network device. Of course, the above predefined information can be replaced by default information, that is, the above available carriers and / or available resource pools can be default.

[0114] In some implementations, the second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information. Of course, in an embodiment of the present application, the second association relationship may also include an association relationship between the second resource pool and the fourth information. In other words, the carrier associated with the fourth information of the first terminal device and the resource pool within the carrier can be determined by establishing a second association relationship, wherein the carrier associated with the fourth information of the first terminal device is the second carrier, and the resource pool associated with the fourth information of the first terminal device is the second resource pool.

[0115] In some implementations, the second association relationship may include an association relationship between a second carrier and fourth information, where the second carrier may be represented by indication information of the second carrier. That is, the carrier in the second association relationship may be represented by a carrier index, a carrier sequence number, or the like. Taking the example of the fourth information including information about a first carrier, the second association relationship may include an association relationship between the information about the first carrier and the indication information of the carrier. Taking the example of the fourth information including information about a target QoS flow, the second association relationship may include an association relationship between the information about the target QoS flow and the indication information of the carrier. Taking the example of the fourth information including information about a logical channel, the second association relationship may include an association relationship between the information about the logical channel and the indication information of the carrier. Taking the example of the fourth information including information about a first resource pool, the second association relationship may include an association relationship between the information about the first resource pool and the indication information of the carrier. Taking the example of the fourth information including information about a target radio bearer, the second association relationship may include an association relationship between the information about the target radio bearer and the indication information of the carrier. Taking the example of the fourth information including target data priority, the second association relationship may include an association relationship between the target data priority and the indication information of the carrier. Taking the fourth information including the congestion level of the first resource pool as an example, the second association relationship may include an association relationship between the congestion level of the first resource pool and the indication information of the carrier.

[0116] It should be noted that the carrier associated with the fourth information in the above-mentioned second association relationship can be one or more available carriers. That is, the fourth information in the above-mentioned second association relationship can be associated with a carrier set (also referred to as a "second carrier set"), which can include one or more available carriers. In other words, the second association relationship includes an association relationship between the second resource pool and the second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

[0117] In addition, in the embodiment of the present application, the available carrier associated with the fourth information of the first terminal device may include a carrier carrying the second information (fourth sidelink data), that is, a second carrier. In this case, the carrier carrying the fourth sidelink data is also called a "feedback carrier."

[0118] In some implementations, the second association relationship may be defined by an access stratum (AS) of the first terminal device and / or the second terminal device, or in other words, the second association relationship may be applied to the AS layer of the first terminal device and / or the second terminal device. Of course, in the embodiments of the present application, the second association relationship may also be defined by other layers, which is not limited in the embodiments of the present application.

[0119] It should be noted that the resource pool used to transmit the fourth sidelink data can be determined based on the association between the fourth information and the first carrier. The way to establish the association is similar to the way to establish the second association above. For the sake of brevity, it will not be repeated here.

[0120] The above describes the solution for determining the second carrier in the embodiment of the present application in combination with the third information and the fourth information. The following describes the solution for determining the second carrier in the embodiment of the present application in combination with the fifth information.

[0121] In some implementations, the second carrier is determined based on one or more of the following fifth information, where determining based on the fifth information may, for example, include calculating based on the fifth information. The fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool.

[0122] Taking the example of the fifth information including layer 2 information, the layer 2 information can be associated with the third side line data. In some implementations, the layer 2 information can be used to indicate the communication device that transmits the third side line data through layer 2. For example, the layer 2 information can include a layer 2 index.

[0123] Taking the fifth information including the frequency domain resources of the first information as an example, the frequency domain resources of the first information may be the frequency domain resources used to transmit the first information. The frequency domain resources may include, for example, resource elements (REs), subcarriers, carriers, and the like.

[0124] Taking the fifth information including configuration information of the first resource pool as an example, the configuration information of the first resource pool includes one or more configuration parameters for configuring the first resource pool, such as the PSFCH period, the number of subchannels, the number of physical resource blocks (PRBs) available for PSFCH transmission, and other parameters. In addition, the first resource pool is used to transmit the first information, and therefore, the first resource pool is also referred to as a "data transmission resource pool."

[0125] For example, the fifth information includes configuration information of the second resource pool. The configuration information of the second resource pool includes one or more configuration parameters for configuring the second resource pool, such as the PSFCH period, the number of subchannels, the number of PRBs available for PSFCH transmission, and other parameters. Furthermore, the second resource pool is used to transmit the second information. Therefore, the second resource pool is also referred to as a "feedback transmission resource pool."

[0126] It should be noted that, in the embodiments of the present application, the above-mentioned information included in the fifth information can be pre-configured, configured by the network device, or predetermined. Taking the fifth information configured by the network device as an example, the network device can configure the fifth information through proprietary signaling configuration or system message configuration. Of course, in the embodiments of the present application, the fifth information can also be configured through other information.

[0127] In addition, in some scenarios, the fifth information may include multiple pieces of information introduced above. In this case, the second carrier determined based on different information may be different. In this case, the information of the second carrier can be determined by predefinition, preconfiguration, or negotiation between the first terminal device and the second terminal device. For example, the fifth information includes the configuration information of the first resource pool and the configuration information of the second resource pool. In this case, the second carrier determined based on the configuration information of the first resource pool may be different from the second carrier determined based on the configuration information of the second resource pool. In this case, the resource pool configuration may indicate whether the second carrier is determined based on the configuration information of the first resource pool or the configuration information of the second resource pool. Alternatively, the protocol may predefine to indicate whether the second carrier is determined based on the configuration information of the first resource pool or the configuration information of the second resource pool. Alternatively, the first terminal device and the second terminal device may negotiate to determine whether the second carrier is determined based on the configuration information of the first resource pool or the configuration information of the second resource pool.

[0128] In the above-mentioned scheme of negotiation between the first terminal device and the second terminal device, the embodiment of the present application does not limit the signaling used for negotiation between the first terminal device and the second terminal device. For example, the signaling used for negotiation between the first terminal device and the second terminal device can be carried in one or more signalings of PC5-radio resource control (RRC), media access control control element (MAC CE), and sidelink control information (SCI). For example, if the first terminal device and the second terminal device communicate in a unicast manner, the signaling used for negotiation between the first terminal device and the second terminal device can be carried in one or more signalings of PC5-RRC, MAC CE, and SCI.

[0129] Of course, in this embodiment of the present application, the carrier determined based on the fifth information may include one or more available carriers. In this case, an available carrier may be selected from the available carriers according to a preset rule or randomly as the second carrier to transmit the second information. In other words, the second carrier belongs to a third carrier set determined based on the fifth information, where the third carrier set includes one or more carriers that can be used to transmit the second information.

[0130] The above describes the method for determining the second carrier in combination with the third information, the fourth information, and the fifth information, respectively. In an embodiment of the present application, the above method for determining the second carrier can be used alone. Of course, in an embodiment of the present application, the above method for determining the second carrier can also be used in combination with each other. For example, an association relationship with an available carrier can be established through the third information and the fourth information, and then the second carrier can be selected from the available carriers. For another example, an association relationship with an available carrier can be established through the fourth information and the fifth information, and then the second carrier can be selected from the available carriers. For another example, an association relationship with an available carrier can be established through the third information and the fifth information, and then the second carrier can be selected from the available carriers. Among them, the combination of the above three types of information can be pre-configured, pre-defined, configured by a network device, or determined by negotiation between the first terminal device and the second terminal device, and the embodiment of the present application is not limited to this.

[0131] In addition, in an embodiment of the present application, the various association relationships involved above (for example, the first association relationship, the second association relationship, and the third association relationship) can be applied to the scenario of unicast communication between the first terminal device and the second terminal device, or to the scenario of multicast communication between the first terminal device and the second terminal device, or to the scenario of broadcast communication between the first terminal device and the second terminal device.

[0132] In some implementations, the first terminal device may also dynamically indicate the second carrier to the second terminal device. That is, the method further includes: the first terminal device sending first indication information to the second terminal device, where the first indication information is used to indicate the second carrier. The first indication information may be carried in a first-order SCI and / or a second-order SCI. Of course, the first indication information may also be dedicated information transmitted independently, which is not limited in this embodiment of the present application.

[0133] In some implementations, the first indication information includes one or more of the following: indication information of the second carrier; indication information of the second resource pool; indication information of the time domain resources used to transmit the second information; and indication information of the frequency domain resources used to transmit the second information.

[0134] The indication information of the second carrier may include, for example, an identifier of the second carrier, a sequence number of the second carrier, etc. In some implementations, the indication information of the second carrier may include a carrier indication.

[0135] The indication information of the second resource pool mentioned above, wherein the second resource pool is used to transmit the second information (ie, the fourth sidelink data), is also called the second resource pool indication.

[0136] The above-mentioned indication information of the time domain resources used to transmit the second information, or the indication information of the time domain resources that can be used to transmit the second information, wherein the indication information of the time domain resources is also called the indication of the time domain resources, for example, the indication information of the time domain resources may include the index of the symbol used to transmit the second information.

[0137] The above-mentioned indication information of the frequency domain resources used to transmit the second information, or the indication information of the frequency domain resources that can be used to transmit the second information, wherein the indication information of the frequency domain resources is also called the indication of the frequency domain resources, for example, the indication information of the frequency domain resources may include the index of the symbol used to transmit the second information.

[0138] It should be noted that the above solution for dynamically indicating the second carrier can also be applied to dynamically indicating the first carrier, and the specific indication method is similar to the above solution for indicating the second carrier. For the sake of brevity, it will not be repeated here.

[0139] In some implementations, the first terminal device and the second terminal device may determine the first carrier and / or the second carrier through negotiation. In other words, the first carrier and / or the second carrier are determined based on negotiation between the first terminal device and the second terminal device.

[0140] In some implementations, the negotiation may be performed through capability exchange between the first terminal device and the second terminal device. The capability exchange may be the first terminal device indicating capability information of the first terminal device to the second terminal device. That is, the method further includes: the first terminal device sending the capability information of the first terminal device to the second terminal device, where the capability information of the first terminal device indicates carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device.

[0141] The above-mentioned capability interaction may be that the second terminal device indicates the capability information of the second terminal device to the first terminal device, that is, the above-mentioned method also includes: the second terminal device sends the capability information of the second terminal device to the first terminal device, and the capability information of the second terminal device is used to indicate the carrier supported by the second terminal device and / or the number of carriers supported by the second terminal device.

[0142] Of course, in the embodiment of the present application, capability interaction may include the first terminal device indicating the capability information of the first terminal device to the second terminal device, and the second terminal device indicating the capability information of the second terminal device to the first terminal device. The embodiment of the present application does not limit the order of transmission between the capability information of the first terminal device and the capability information of the second terminal device. For example, the capability information of the first terminal device may be transmitted before the capability information of the second terminal device. For another example, the capability information of the second terminal device may be transmitted before the capability information of the first terminal device. For another example, the capability information of the second terminal device and the capability information of the first terminal device may be transmitted simultaneously.

[0143] In some implementations, the first terminal device may determine the first carrier and / or the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device. For example, the capability information of the first terminal device indicates that the first terminal device supports carriers 1 to 3, and the capability information of the second terminal device indicates that the second terminal device supports carriers 2 to 3. At this time, the first terminal device may select carriers 2 to 3 as the first carrier and the second carrier. Of course, in an embodiment of the present application, the second terminal device may also determine the first carrier and / or the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device. Alternatively, in an embodiment of the present application, the second terminal device determines the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device, and the first terminal device determines the first carrier based on the capability information of the first terminal device and the capability information of the second terminal device. Alternatively, the second terminal device determines the first carrier based on the capability information of the first terminal device and the capability information of the second terminal device, and the first terminal device determines the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device.

[0144] In some implementations, the negotiation may be implemented through one or more signaling interactions transmitted between the first terminal device and the second terminal device. For ease of understanding, the following description is provided in conjunction with FIG10 , where the signaling may, for example, include first configuration information. That is, the method further includes: the first terminal device sending first configuration information to the second terminal device (see step S1010), where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device.

[0145] In some implementations, the first configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information. Of course, in this embodiment of the present application, the first configuration information can directly configure the first carrier and / or the second carrier.

[0146] In the embodiment of the present application, the first configuration information can be carried by PC5-RRC. Of course, in the embodiment of the present application, the first configuration information can also be carried by dedicated signaling, which is not limited in the embodiment of the present application.

[0147] The above signaling may, for example, include second configuration information, that is, the above method also includes: the second terminal device sends second configuration information to the first terminal device (see step S1010), and the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

[0148] In the embodiment of the present application, the second configuration information can be carried by PC5-RRC. Of course, in the embodiment of the present application, the second configuration information can also be carried by dedicated signaling, which is not limited in the embodiment of the present application.

[0149] In some implementations, the second configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information. Of course, in this embodiment of the present application, the second configuration information can directly configure the first carrier and / or the second carrier.

[0150] For ease of description, the terminal device that sends the first configuration information and / or the second configuration information is referred to as a "configured terminal," and the terminal device that receives the first configuration information and / or the second configuration information is referred to as a "non-configured terminal." In other words, for the first configuration information, the configured terminal is the first terminal device, and the non-configured terminal is the second terminal device. For the second configuration information, the configured terminal is the second terminal device, and the non-configured terminal is the first terminal device.

[0151] In some scenarios, the non-configured terminal may send a recommended carrier to the configured terminal (see step S1020) to improve the rationality of the carrier configuration of the configured terminal. In other words, before transmitting the first configuration information and / or the second configuration information, the non-configured terminal may send a second indication information to the configured terminal device. The second indication information is used to indicate the available carrier (also known as a "candidate carrier") recommended by the non-configured terminal. The candidate carrier is used to configure the terminal device to configure the first carrier and / or the second carrier.

[0152] In some scenarios, after receiving an available carrier configured by a configured terminal device, a non-configured terminal device may find that the available carrier is not suitable. In this case, the non-configured terminal device can reject the available carrier. Of course, if the available carrier is suitable, the non-configured terminal device can accept the available carrier.

[0153] If the non-configured terminal device accepts the available carrier, the non-configured terminal may send information indicating acceptance of the available carrier to the configured terminal (see step S1030). Of course, in the embodiment of the present application, the non-configured terminal may not send information indicating acceptance of the available carrier to the configured terminal. Accordingly, if the non-configured terminal uses the available carrier within a preset time, it can be determined that the non-configured terminal accepts the available carrier.

[0154] If the non-configured terminal rejects the available carrier, the non-configured terminal may send information indicating the rejection of the available carrier to the configured terminal (see step S1040). Of course, in the embodiment of the present application, the non-configured terminal may not send information indicating the rejection of the available carrier to the configured terminal. Accordingly, if the non-configured terminal does not use the available carrier within a preset time, it can be determined that the non-configured terminal device can reject the available carrier.

[0155] In some scenarios, if the non-configured terminal rejects the available carrier, the configured terminal may send reconfiguration information to the non-configured terminal (see step S1050 ), where the reconfiguration information is used to reconfigure the first carrier and / or the second carrier for the non-configured terminal.

[0156] In some implementations, if a preset condition is met, the reconfiguration process may be considered to have failed. The preset condition may be related to the number of times the configured terminal configures the first carrier and / or the second carrier for the non-configured terminal, and / or the preset condition may be related to the duration of the configuration of the first carrier and / or the second carrier for the non-configured terminal by the configured terminal.

[0157] For example, if the preset condition is related to the number of times the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal, the preset condition may include that the number of times the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal is greater than a threshold.

[0158] For another example, if the preset condition is related to the duration for which the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal, the preset condition may include that the duration for which the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal is greater than a threshold.

[0159] It should be noted that in the embodiments of the present application, there is no limitation on the reasons why a non-configured terminal rejects an available carrier. For example, assuming that the non-configured terminal is terminal device 1, and the configured terminals include terminal device 2 and terminal device 3, terminal device 2 configures terminal device 1 to send feedback information on carrier 2, and terminal device 3 configures terminal device 1 to send feedback information on carrier 3. At this time, terminal device 1 needs to send feedback information on carrier 2 and carrier 3 respectively, resulting in higher power consumption of terminal device 1. In this case, terminal device 1 can reject the configuration of terminal device 3.

[0160] In addition, the first configuration information and / or the second configuration information may be determined based on the candidate carrier indicated by the non-configuration terminal. In the embodiment of the present application, the first configuration information and / or the second configuration information may be determined autonomously by the configuration terminal, which is not limited in the embodiment of the present application.

[0161] In some implementations, any of the configuration processes described above can be used in conjunction with dynamic activation. That is, after the available carriers configured by the first and / or second configuration information are configured for a non-configured terminal, the configured terminal can send third indication information to the non-configured terminal to indicate whether to activate the configured available carriers. In other words, the third indication information indicates whether to allow the second information to be transmitted via the second carrier.

[0162] For example, terminal device 1 configures carrier set A for terminal device 2. At this time, carrier set A includes one or more available carriers associated with the second information. Afterwards, terminal device 1 can send indication information 3 to terminal device 2 to indicate the carriers in carrier set A that can be used to transmit the second information.

[0163] In the embodiment of the present application, there is no limitation on the carrying method of the third indication information. For example, the third indication information can be carried in a MAC CE. For another example, the third indication information can be carried in an SCI.

[0164] In some implementations, whether the second information is transmitted via the second carrier is determined based on one or more of the following: whether there is a carrier available for transmitting the second information; QoS parameters associated with the first information; communication quality between the first terminal device and the second terminal device; and resource congestion of resources available for transmitting the second information.

[0165] If whether the second information is transmitted via the second carrier is determined based on whether a carrier is available for transmitting the second information, in some implementations, if a carrier is available for transmitting the second information, the second information may be transmitted via the second carrier. In other implementations, if no carrier is available for transmitting the second information, the second information may not be transmitted via the second carrier.

[0166] For example, if there is only a second carrier (i.e., cross-carrier feedback resource) and there are no resources available for PSFCH in the current resource pool, the second information may be transmitted through the second carrier (i.e., using cross-carrier feedback). For another example, if there is a second carrier (i.e., cross-carrier feedback resource) and there are resources available for PSFCH in the current resource pool, the second information may not be transmitted through the second carrier (i.e., using cross-carrier feedback). For another example, if there is no second carrier (i.e., cross-carrier feedback resource) and there are resources available for PSFCH in the current resource pool, the second information may not be transmitted through the second carrier (i.e., using cross-carrier feedback).

[0167] If whether the second information is transmitted via the second carrier is determined based on the QoS parameters associated with the first information, in some implementations, if the QoS parameters associated with the first information have higher requirements, the second information may be transmitted via the second carrier. In other implementations, if the QoS parameters associated with the first information have lower requirements, the second information is not transmitted via the second carrier.

[0168] Alternatively, in some other implementations, if the QoS parameter requirement associated with the first information is relatively low, the second information may be transmitted via the second carrier. In some other implementations, if the QoS parameter requirement associated with the first information is relatively high, the second information is not transmitted via the second carrier.

[0169] For example, the QoS parameter includes transmission delay. If the transmission delay associated with the first information is less than a threshold, the second information may be transmitted via the second carrier. Conversely, if the transmission delay associated with the first information is greater than the threshold, the second information is not transmitted via the second carrier.

[0170] For another example, the QoS parameter includes a packet error rate (PER). If the PER associated with the first information is greater than a threshold, the second information may be transmitted via the second carrier. Conversely, if the PER associated with the first information is less than the threshold, the second information is not transmitted via the second carrier.

[0171] If whether the second information is transmitted via the second carrier is determined based on communication quality, in some implementations, if the communication quality is high, the second information may be transmitted via the second carrier. In other implementations, if the communication quality is low, the second information is not transmitted via the second carrier. Alternatively, in some implementations, if the communication quality is high, the second information may not be transmitted via the second carrier. In other implementations, if the communication quality is low, the second information is transmitted via the second carrier.

[0172] For example, the communication quality is determined based on the packet loss rate. If the packet loss rate is lower than a threshold, the second information may be transmitted via the second carrier. Conversely, if the packet loss rate is higher than the threshold, the second information is not transmitted via the second carrier.

[0173] For example, communication quality is determined based on feedback information reception status. If the feedback information reception status indicates that the feedback information has not been received for x consecutive times, activation is performed, and x is greater than a threshold value, and the second information may be transmitted via the second carrier. Conversely, if the feedback information reception status indicates that the feedback information has not been received for x consecutive times, activation is performed, and x is less than a threshold value, and the second information is not transmitted via the second carrier, where x is a positive integer.

[0174] If whether the second information is transmitted via the second carrier is determined based on resource congestion, in some implementations, if the resource congestion is severe (e.g., the CBR is higher than a threshold), the second information may not be transmitted via the second carrier. In other implementations, if the resource congestion is less severe (e.g., the CBR is lower than a threshold), the second information is transmitted via the second carrier.

[0175] Of course, in the embodiment of the present application, whether the second information is transmitted via the second carrier may also be determined in other ways. In some implementations, whether the second information is transmitted via the second carrier may be determined based on a preset rule.

[0176] In other implementations, whether the second information is transmitted via the second carrier may be determined based on an upper layer (e.g., non-access stratum (NAS)) indication. For example, whether the second information is transmitted via the second carrier may be determined based on third information. The third information is described above and will not be described again for the sake of brevity. For another example, whether the second information is transmitted via the second carrier may be determined based on a first association relationship associated with the third information. The first association relationship is described above and will not be described again for the sake of brevity.

[0177] In other implementations, it can be determined whether the second information is transmitted through the second carrier based on the AS layer configuration. The AS layer configuration activation can be configured for each bearer, for example, or the AS layer configuration activation can be configured for each logical channel (logical channel, LCH), for example, or the AS layer configuration activation can be configured for each link, for example, or the AS layer configuration activation can be configured for each sideline authorization, for example, or the AS layer configuration activation can be configured for each configured grant (configured grant, CG). The AS layer configuration can be configured by a network device or other terminal device.

[0178] In other implementations, whether the second information is transmitted via the second carrier may be determined based on a dynamic indication (or indication information). The indication information may be configured by a network device or another terminal device. Furthermore, the indication information may be carried in one or more of the following: MAC CE, SCI, or downlink control information.

[0179] It should be noted that the above determination of whether the second information is transmitted via the second carrier may be performed by the first terminal device or the second terminal device. Of course, in the embodiment of the present application, the above determination of whether the second information is transmitted via the second carrier may also be determined by the network device, and the embodiment of the present application does not limit this.

[0180] In some scenarios, if the cross-carrier feedback scheme of an embodiment of the present application is adopted, the second terminal device can send the second information through multiple carriers, which helps to improve the reliability of transmitting the second information. That is, the second carrier belongs to one of the multiple carriers, and the first terminal device receives the second information sent by the second terminal device through the second carrier, including: the first terminal device receives the second information sent by the second terminal device through the multiple carriers, or in other words, the second carrier belongs to one of the multiple carriers, the second information belongs to one of multiple second information, and the multiple second information are transmitted through the multiple carriers.

[0181] It should be noted that the second terminal device may transmit the second information multiple times through some or all of the multiple carriers. Of course, in the embodiment of the present application, the second terminal device may transmit the second information once through some or all of the multiple carriers, and the embodiment of the present application is not limited to this.

[0182] In a traditional third sideline data transmission scheme, if the third sideline data is transmitted via carrier 1, the fourth sideline data is also fed back via carrier 1. In this scenario, whether a radio link failure (RLF) has occurred in the communication link is typically determined by counting the number of failed receptions of the fourth sideline data on carrier 1. However, in the scenario described above where the second information is transmitted via multiple carriers, determining whether a communication link has failed is an urgent issue to be resolved.

[0183] Therefore, to address the above-mentioned issues, embodiments of the present application propose determining whether an RLF has occurred in the radio link used to transmit the first information based on the unsuccessful reception information on the target carrier. In other words, whether an RLF has occurred in the radio link used to transmit the first information is determined based on the unsuccessful reception information on the target carrier. For example, determining whether an RLF has occurred can be based on the number of unsuccessful receptions on the target carrier. In another example, determining whether an RLF has occurred can be based on the duration of unsuccessful receptions on the target carrier.

[0184] In some implementations, the target carrier includes multiple carriers and the first carrier. For example, a counter (denoted by "numDTX") may be set for each of the multiple carriers and the first carrier. If the fourth sidelink data on a carrier is not received, the counters corresponding to the multiple carriers and the first carrier are incremented by 1 until the count in the counter is greater than or equal to a threshold, thereby determining that the radio link used to transmit the first information has failed.

[0185] In some implementations, the target carrier is one of multiple carriers. For example, a counter (denoted by "numDTX") may be set for the target carrier. If the fourth sidelink data on the target carrier is not received, the counter corresponding to the target carrier is incremented by 1 until the count in the counter is greater than or equal to a threshold, thereby determining that the radio link used to transmit the first information has failed.

[0186] In the embodiments of the present application, the target carrier is not limited. For example, the target carrier can be any one of multiple carriers. For another example, the target carrier can be the carrier with the highest priority among the multiple carriers. For another example, the target carrier can be the primary carrier among the multiple carriers.

[0187] In addition, the embodiments of the present application do not limit the method for determining the target carrier. For example, the target carrier may be determined by the first terminal device. For another example, the target carrier may be determined by the second terminal device. For another example, the target carrier may be negotiated between the first terminal device and the second terminal device. For another example, the target carrier may be predefined. For another example, the target carrier may be preconfigured. For another example, the target carrier may be determined based on a resource pool configuration. For another example, the target carrier may be determined based on a carrier configuration. For another example, the target carrier may be configured by the network.

[0188] Currently, in the traditional sidelink discontinuous reception (SL DRX) mechanism, the activation of the first timer associated with the SL DRX mechanism (e.g., round-trip time (RTT) timer and / or retransmission timer) is determined based on the PSFCH resource. Therefore, in the cross-carrier feedback scenario proposed in the embodiments of the present application, how to determine the activation of the above timer is an urgent problem to be solved.

[0189] Therefore, to address the above issues, in an embodiment of the present application, it is proposed that the start of the first timer be determined based on one or more of the following: a PSFCH resource on the first carrier; a PSFCH resource with the latest time domain position among multiple carriers; a PSFCH resource on the carrier with the highest priority among multiple carriers; or a PSFCH resource on the primary carrier among multiple carriers. Of course, a PSFCH resource can also be randomly selected for determination, and this embodiment of the present application is not limited to this.

[0190] If the start of the first timer is determined based on the PSFCH resource with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, the multiple carriers include the second carrier.

[0191] In some implementations, the first timer is used to determine a round trip time for transmitting the first information, for example, it may be an RTT timer. In other implementations, the first timer is used to determine a retransmission time of the first information, for example, it may be a retransmission timer.

[0192] It should be noted that the start of the first timer is determined based on the above-mentioned PSFCH resource, and may include that the start time of the first timer is the time domain position of the PSFCH resource, or the start time of the first timer is the start time of the first timer is determined by the time domain position of the PSFCH resource and the time domain offset value. Among them, the time domain position of the PSFCH resource may include the starting time domain position of the PSFCH resource, the ending time domain position of the PSFCH resource, or a certain time domain position of the PSFCH resource.

[0193] Example 2: Assume that the second information includes first sidelink data, and the first information includes first sidelink control information for scheduling the first sidelink data. In other words, the second information is carried on a second physical sidelink shared channel (PSSCH), and the first information is carried on a first physical sidelink control channel (PSCCH) for scheduling the second PSSCH.

[0194] In some implementations, the first sidelink control information may be used to schedule second sidelink data on the first carrier and the first sidelink data transmitted on the second carrier. In other words, the first information also includes the second sidelink data scheduled by the first sidelink control information. Alternatively, the first sidelink control information may be used to schedule a second PSSCH on the first carrier and the first PSSCH transmitted on the second carrier. In other words, the first information also includes the sidelink data carried on the second PSSCH.

[0195] In other implementations, the first sidelink control information (e.g., first-order SCI) can be used to schedule second sidelink data on the first carrier, as well as the first sidelink data and second sidelink control information (e.g., second-order SCI) transmitted on the second carrier. That is, the second information also includes the second sidelink control information scheduled by the first sidelink control information. Alternatively, the first sidelink control information can be used to schedule a second PSSCH on the first carrier, as well as a first PSSCH transmitted on the second carrier, where the first PSSCH includes the second sidelink control information and the first sidelink data.

[0196] In some scenarios, in order to prevent terminal devices that do not support cross-carrier transmission schemes from being unable to recognize the above-mentioned first information and second information, a first resource pool can be set for the transmission of the first information and a second resource pool can be set for the transmission of the second information.

[0197] The first resource pool is used to transmit the PSCCH and is therefore also referred to as a "PSCCH-only resource pool." Alternatively, the first resource pool is used to transmit sidelink control information and is therefore also referred to as a "SCI-only resource pool." "SCI-only" can be understood as not being transmitted along with sidelink data, or not being used to transmit sidelink data.

[0198] The second resource pool is used to transmit the PSSCH and is therefore also referred to as a "PSSCH-only resource pool." Alternatively, the second resource pool is used to transmit sidelink control information and is therefore also referred to as a "data / payload-only resource pool or payload-only resource pool." "Data / payload-only" can be understood as not being transmitted along with sidelink control information, or not being used to transmit sidelink control information.

[0199] It should be noted that in the embodiment of the present application, the first sideline control information is different from the traditional sideline control information. The first sideline control information in the embodiment of the present application is used for cross-carrier scheduling. Therefore, in some implementations, the first sideline control information may adopt a specific SCI format (for example, a newly introduced SCI format) to distinguish it from the traditional SCI. At this time, a resource pool may be set for the transmission of the first sideline control information. Among them, the resource pool may only transmit the first sideline control information, or the resource pool may be used to transmit the first sideline control information, that is, it may be an example of the first resource pool introduced above. In addition, in the embodiment of the present application, the above-mentioned first resource pool and the second resource pool may also be divided according to the dimension of available transmission of sideline control information or available for transmission of sideline data. For example, the first resource pool is used to transmit sideline control information (including the first sideline control information and / or the second sideline control information). The second resource pool is used to transmit third sideline data (including the first sideline data and / or the second sideline data).

[0200] It should be noted that the side data involved in the embodiments of the present application may be initially transmitted data or retransmitted data, and the embodiments of the present application do not limit this.

[0201] As described above, the introduction of multiple resource pools may affect the resource detection process. In some implementations, the sidelink resource for transmitting the second information is determined based on the resource detection result. Accordingly, the resource detection result includes the resource detection result of the first resource pool and / or the resource detection result of the second resource pool.

[0202] If the resource detection result includes the resource detection result of the first resource pool, it can be understood that resource detection is only performed in the resource pool associated with the PSCCH (i.e., the first resource pool), and resource exclusion and / or resource selection are performed on the resources in the scheduled resource pool (i.e., the second resource pool) based on the resource detection result.

[0203] If the resource detection result includes the resource detection result of the resource pool on the first carrier, it can be understood that resource detection is only performed in the resource pool on the first carrier (i.e., the first resource pool), and resource exclusion and / or resource selection is performed on the resources in the resource pool on the scheduled carrier (i.e., the second resource pool) based on the resource detection result.

[0204] The resource pool on the first carrier or the resource pool associated with the PSCCH can transmit the first sidelink control information and therefore can also be referred to as the "resource pool where the scheduling information is located." Correspondingly, the second resource pool can transmit the scheduled information and therefore can also be referred to as the "resource pool where the scheduled information is located."

[0205] Of course, in an embodiment of the present application, resource detection may also be performed in the first resource pool and the second resource pool at the same time, and then based on the resource detection result of the first resource pool, resource exclusion and / or resource selection may be performed on the resources in the first resource pool, and based on the resource detection result of the second resource pool, resource exclusion and / or resource selection may be performed on the resources in the second resource pool. Alternatively, in an embodiment of the present application, resource detection may also be performed in the first resource pool and the second resource pool at the same time, and then based on the resource detection result of the first resource pool and the resource detection result of the second resource pool, resource exclusion and / or resource selection may be performed on the resources in the first resource pool and the resources in the second resource pool. That is to say, the resource detection result of the first resource pool and the resource detection result of the second resource pool may be comprehensively considered to exclude and / or select the resources in the first resource pool and the resources in the second resource pool.

[0206] As described above, the first information and the second information can be transmitted via different carriers. Therefore, determining the second carrier used to transmit the second information is an urgent issue. Therefore, in response to this issue, an embodiment of the present application proposes that the second carrier can be determined based on some information shared by the first terminal device and the second terminal device (hereinafter referred to as "third information").

[0207] That is, the second carrier can be determined based on the third information, where the third information includes one or more of the following: information on the target service type, information on the target service, information on the target application type, information on the target application, layer 2 information, sending configuration, and data transmission type.

[0208] Taking the example of the third information including the target service type, the target service type may be, for example, the service type of the service to which the first sideline control information belongs. The target service type may include, for example, a rate-prioritized service type, a reliability-prioritized service type, etc., which is not limited in this embodiment of the present application.

[0209] In some implementations, the target service type information may be used to indicate the target service type. For example, the target service type information may be an index of the target service type.

[0210] Taking the example where the third information includes information about a target service, the target service may be the service to which the first sideline control information belongs. In some implementations, the information about the target service is used to indicate the target service, for example, the information about the target service may be an index of the target service.

[0211] Taking the example where the third information includes information about the target application type, the target application type may be, for example, the application type of the application to which the first sideline control information belongs. In some implementations, the information about the target application type may be used to indicate the target application type, for example, the information about the target application type may be an index of the target application type.

[0212] Taking the example where the third information includes information about a target application, the target application may be, for example, the application type of the application to which the first sideline control information belongs. In some implementations, the information about the target application may be used to indicate the target application, for example, the information about the target application may be an index of the target application.

[0213] Taking the example that the third information includes layer 2 information, the layer 2 information can be associated with the first sideline control information. In some implementations, the communication device that transmits the first sideline control information via layer 2, for example, the layer 2 information can include a layer 2 index.

[0214] Taking the example of the third information including transmission configuration (Tx profile), the transmission configuration information may be associated with the first sideline control information. In some implementations, the transmission configuration information may be used to indicate the transmission configuration of the first sideline control information. For example, the transmission configuration may include information indicating the transmission configuration. In another example, the transmission configuration may include transmission configuration parameters of the first information.

[0215] Taking the example of the third information including information on a data transmission type, the data transmission type may be, for example, the data transmission type of the first sidelink control information, where the data transmission type may include one or more of unicast, multicast, and broadcast. In some implementations, the data transmission type information may be used to indicate the data transmission type. For example, the data transmission type information may include an identifier of the data transmission type.

[0216] In some implementations, the second carrier is determined based on a first association between the second carrier and the third information. That is, by establishing an association between the carrier and the third information, the carrier associated with the third information of the first terminal device can be determined, where the carrier associated with the third information of the first terminal device is the second carrier.

[0217] In some implementations, the first association may be an association between the third information and carrier indication information, where the carrier indication information may be a carrier index, a carrier sequence number, or the like. Taking the example of the third information including target service type information, the first association may include an association between the target service type information and the carrier indication information. Taking the example of the third information including target service information, the first association may include an association between the target service information and the carrier indication information. Taking the example of the third information including target application type information, the first association may include an association between the target application type information and the carrier indication information. Taking the example of the third information including layer 2 information, the first association may include an association between the layer 2 information and the carrier indication information. Taking the example of the third information including transmission configuration, the first association may include an association between the transmission configuration and the carrier indication information. Taking the example of the third information including data transmission type, the first association may include an association between the data transmission type and the carrier indication information.

[0218] It should be noted that the carrier associated with the third information in the first association relationship may be one or more available carriers. That is, the third information in the first association relationship may be associated with a carrier set, which may include one or more available carriers. For example, the second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, where the first carrier set includes one or more carriers that can be used to transmit the second information.

[0219] In addition, in an embodiment of the present application, the available carrier associated with the third information of the first terminal device may include a carrier carrying the second information (first sidelink data), that is, a second carrier.

[0220] In some implementations, the first association relationship may be defined by an upper layer of the first terminal device and / or the second terminal device, or in other words, the first association relationship may be applied to an upper layer of the first terminal device and / or the second terminal device. For example, the first association relationship may be defined by a NAS layer. For another example, the first association relationship may be defined by a V2X layer. For another example, the first association relationship may be defined by a proximity based services (ProSe) layer.

[0221] It should be noted that the first carrier can be determined based on the association relationship between the third information and the first carrier. The way of establishing the association relationship is similar to the way of establishing the first association relationship above. For the sake of brevity, it will not be repeated here.

[0222] In some scenarios, after determining the available carrier for the second information, it is also necessary to determine the sidelink resources (or the time-frequency resources for transmitting the second information) and / or the second carrier for transmitting the second information. In some implementations, the time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, and the second carrier and / or the second resource pool are determined based on the fourth information.

[0223] In some implementations, the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool, information about the target wireless bearer, target data priority, congestion level of the first resource pool, and predefined information.

[0224] Taking the example of the fourth information including information about the first carrier, where the first carrier is a carrier used to transmit the first sidelink control information, in some implementations, the information about the first carrier can be used to indicate the first carrier, for example, the information about the first carrier can be the sequence number of the first carrier.

[0225] Taking the example of the fourth information including information about a logical channel, the logical channel may be, for example, the logical channel where the first sideline control information is located. In some implementations, the information about the logical channel may be used to indicate the logical channel. For example, the information about the logical channel may include an identifier of the logical channel.

[0226] Taking the example of the fourth information including information about the first resource pool, the first resource pool may be, for example, a resource pool used to transmit the first sidelink control information. In some implementations, the information about the first resource pool may be used to indicate the first resource pool. For example, the information about the first resource pool may include an identifier of the first resource pool.

[0227] Taking the example of the fourth information including information about a target radio bearer, the target radio bearer may be, for example, a radio bearer used to transmit the first sidelink control information. In some implementations, the target radio bearer information may be used to indicate the target radio bearer. For example, the target radio bearer information may include an identifier of the target radio bearer.

[0228] Taking the example of the fourth information including target data priority information, the target data priority information may be, for example, the data priority information of the first sideline control information. In some implementations, the target data priority information may be used to indicate the data priority information of the first sideline control information. For example, the target data priority information may include a target data priority level. For another example, the target data priority information may include an identifier of the target data priority.

[0229] Taking the example where the fourth information includes the congestion level of the first resource pool, the first resource pool may be a resource pool used to transmit the first sidelink control information. In some implementations, the congestion level of the first resource pool may be determined by the CBR in the first resource pool.

[0230] Taking the example of the fourth information including predefined information, in some implementations, the predefined information may be used to indicate one or more available carriers, where the available carriers may be understood as carriers that may be used to transmit the first sidelink control information. In other implementations, the predefined information may be used to indicate one or more available resource pools, where the available resource pools may be understood as resource pools that may be used to transmit the first sidelink control information.

[0231] It should be noted that the above predefined information can be replaced by preconfigured information, wherein the preconfigured information can be preconfigured by the network device. Of course, the above predefined information can be replaced by default information, that is, the above available carriers and / or available resource pools can be default.

[0232] In some implementations, the second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information. Of course, in an embodiment of the present application, the second association relationship may also include an association relationship between the second resource pool and the fourth information. In other words, the carrier associated with the fourth information of the first terminal device and the resource pool within the carrier can be determined by establishing a second association relationship, wherein the carrier associated with the fourth information of the first terminal device is the second carrier, and the resource pool associated with the fourth information of the first terminal device is the second resource pool.

[0233] In some implementations, the second association relationship may include an association relationship between a second carrier and fourth information, where the second carrier may be represented by indication information of the second carrier. That is, the carrier in the second association relationship may be represented by a carrier index, a carrier sequence number, or the like. Taking the example of the fourth information including information about a first carrier, the second association relationship may include an association relationship between the information about the first carrier and the indication information of the carrier. Taking the example of the fourth information including information about a target QoS flow, the second association relationship may include an association relationship between the information about the target QoS flow and the indication information of the carrier. Taking the example of the fourth information including information about a logical channel, the second association relationship may include an association relationship between the information about the logical channel and the indication information of the carrier. Taking the example of the fourth information including information about a first resource pool, the second association relationship may include an association relationship between the information about the first resource pool and the indication information of the carrier. Taking the example of the fourth information including information about a target radio bearer, the second association relationship may include an association relationship between the information about the target radio bearer and the indication information of the carrier. Taking the example of the fourth information including target data priority, the second association relationship may include an association relationship between the target data priority and the indication information of the carrier. Taking the fourth information including the congestion level of the first resource pool as an example, the second association relationship may include an association relationship between the congestion level of the first resource pool and the indication information of the carrier.

[0234] It should be noted that the carrier associated with the fourth information in the above-mentioned second association relationship can be one or more available carriers. That is, the fourth information in the above-mentioned second association relationship can be associated with a carrier set (also referred to as a "second carrier set"), which can include one or more available carriers. In other words, the second association relationship includes an association relationship between the second resource pool and the second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

[0235] In addition, in an embodiment of the present application, the available carrier associated with the fourth information of the first terminal device may include a carrier carrying the second information (first sidelink data), that is, a second carrier.

[0236] In some implementations, the second association relationship may be defined by the AS layer of the first terminal device and / or the second terminal device. Of course, the second association relationship may also be defined by other layers, which is not limited in this embodiment of the present application.

[0237] It should be noted that the resource pool used to transmit the first sidelink data can be determined based on the association between the fourth information and the first carrier. The way to establish the association is similar to the way to establish the second association above. For the sake of brevity, it will not be repeated here.

[0238] The above describes the method for determining the second carrier in combination with the third information and the fourth information respectively. In an embodiment of the present application, the above method for determining the second carrier can be used alone. Of course, in an embodiment of the present application, the above method for determining the second carrier can also be used in combination with each other. For example, an association relationship with an available carrier can be established through the third information and the fourth information, and then the second carrier can be selected from the available carriers. Among them, the combination of the above two types of information can be pre-configured, pre-defined, configured by a network device, or determined by negotiation between the first terminal device and the second terminal device, and the embodiment of the present application is not limited to this.

[0239] In addition, in an embodiment of the present application, the various association relationships involved above (for example, the first association relationship, the second association relationship) can be applied to the scenario of unicast communication between the first terminal device and the second terminal device, or to the scenario of multicast communication between the first terminal device and the second terminal device, or to the scenario of broadcast communication between the first terminal device and the second terminal device.

[0240] In some implementations, the first terminal device may also dynamically indicate the second carrier to the second terminal device. That is, the method further includes: the first terminal device sending first indication information to the second terminal device, where the first indication information is used to indicate the second carrier. The first indication information may be carried in a first-order SCI and / or a second-order SCI. Of course, the first indication information may also be dedicated information transmitted independently, which is not limited in this embodiment of the present application.

[0241] In some implementations, the first indication information includes one or more of the following: indication information of the second carrier; indication information of the second resource pool; indication information of the time domain resources used to transmit the second information; and indication information of the frequency domain resources used to transmit the second information.

[0242] The indication information of the second carrier may include, for example, an identifier of the second carrier, a sequence number of the second carrier, etc. In some implementations, the indication information of the second carrier may include a CIF.

[0243] The indication information of the second resource pool mentioned above, wherein the second resource pool is used to transmit the second information (ie, the first sidelink data), is also called the second resource pool indication.

[0244] The above-mentioned indication information of the time domain resources used to transmit the second information, or the indication information of the time domain resources that can be used to transmit the second information, wherein the indication information of the time domain resources is also called the indication of the time domain resources, for example, the indication information of the time domain resources may include the index of the symbol used to transmit the second information.

[0245] The above-mentioned indication information of the frequency domain resources used to transmit the second information, or the indication information of the frequency domain resources that can be used to transmit the second information, wherein the indication information of the frequency domain resources is also called the indication of the frequency domain resources, for example, the indication information of the frequency domain resources may include the index of the symbol used to transmit the second information.

[0246] It should be noted that the above solution for dynamically indicating the second carrier can also be applied to dynamically indicating the first carrier, and the specific indication method is similar to the above solution for indicating the second carrier. For the sake of brevity, it will not be repeated here.

[0247] In some implementations, the first terminal device and the second terminal device may determine the first carrier and / or the second carrier through negotiation. In other words, the first carrier and / or the second carrier are determined based on negotiation between the first terminal device and the second terminal device.

[0248] In some implementations, the negotiation may be performed through capability exchange between the first terminal device and the second terminal device. The capability exchange may be the first terminal device indicating capability information of the first terminal device to the second terminal device. That is, the method further includes: the first terminal device sending the capability information of the first terminal device to the second terminal device, where the capability information of the first terminal device indicates carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device.

[0249] The above-mentioned capability interaction may be that the second terminal device indicates the capability information of the second terminal device to the first terminal device, that is, the above-mentioned method also includes: the second terminal device sends the capability information of the second terminal device to the first terminal device, and the capability information of the second terminal device is used to indicate the carrier supported by the second terminal device and / or the number of carriers supported by the second terminal device.

[0250] Of course, in the embodiment of the present application, capability interaction may include the first terminal device indicating the capability information of the first terminal device to the second terminal device, and the second terminal device indicating the capability information of the second terminal device to the first terminal device. The embodiment of the present application does not limit the order of transmission between the capability information of the first terminal device and the capability information of the second terminal device. For example, the capability information of the first terminal device may be transmitted before the capability information of the second terminal device. For another example, the capability information of the second terminal device may be transmitted before the capability information of the first terminal device. For another example, the capability information of the second terminal device and the capability information of the first terminal device may be transmitted simultaneously.

[0251] In some implementations, the first terminal device may determine the first carrier and / or the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device. For example, the capability information of the first terminal device indicates that the first terminal device supports carriers 1 to 3, and the capability information of the second terminal device indicates that the second terminal device supports carriers 2 to 3. At this time, the first terminal device may select carriers 2 to 3 as the first carrier and the second carrier. Of course, in an embodiment of the present application, the second terminal device may also determine the first carrier and / or the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device. Alternatively, in an embodiment of the present application, the second terminal device determines the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device, and the first terminal device determines the first carrier based on the capability information of the first terminal device and the capability information of the second terminal device. Alternatively, the second terminal device determines the first carrier based on the capability information of the first terminal device and the capability information of the second terminal device, and the first terminal device determines the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device.

[0252] In some implementations, the negotiation may be implemented through one or more signaling interactions transmitted between the first terminal device and the second terminal device. For ease of understanding, the following description is provided in conjunction with FIG10 , where the signaling may, for example, include first configuration information. That is, the method further includes: the first terminal device sending first configuration information to the second terminal device (see step S1010), where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device.

[0253] In some implementations, the first configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information. Of course, in this embodiment of the present application, the first configuration information can directly configure the first carrier and / or the second carrier.

[0254] In the embodiment of the present application, the first configuration information can be carried by PC5-RRC. Of course, in the embodiment of the present application, the first configuration information can also be carried by dedicated signaling, which is not limited in the embodiment of the present application.

[0255] The above signaling may, for example, include second configuration information, that is, the above method also includes: the second terminal device sends second configuration information to the first terminal device (see step S1010), and the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

[0256] In the embodiment of the present application, the second configuration information can be carried by PC5-RRC. Of course, in the embodiment of the present application, the second configuration information can also be carried by dedicated signaling, which is not limited in the embodiment of the present application.

[0257] In some implementations, the second configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information. Of course, in this embodiment of the present application, the second configuration information can directly configure the first carrier and / or the second carrier.

[0258] For ease of description, the terminal device that sends the first configuration information and / or the second configuration information is referred to as a "configured terminal," and the terminal device that receives the first configuration information and / or the second configuration information is referred to as a "non-configured terminal." In other words, for the first configuration information, the configured terminal is the first terminal device, and the non-configured terminal is the second terminal device. For the second configuration information, the configured terminal is the second terminal device, and the non-configured terminal is the first terminal device.

[0259] In some scenarios, the non-configured terminal may send a recommended carrier to the configured terminal (see step S1020) to improve the rationality of the carrier configuration of the configured terminal. In other words, before transmitting the first configuration information and / or the second configuration information, the non-configured terminal may send a second indication information to the configured terminal device. The second indication information is used to indicate the available carrier (also known as a "candidate carrier") recommended by the non-configured terminal. The candidate carrier is used to configure the terminal device to configure the first carrier and / or the second carrier.

[0260] In some scenarios, after receiving an available carrier configured by a configured terminal device, a non-configured terminal device may find that the available carrier is not suitable. In this case, the non-configured terminal device can reject the available carrier. Of course, if the available carrier is suitable, the non-configured terminal device can accept the available carrier.

[0261] If the non-configured terminal device accepts the available carrier, the non-configured terminal may send information indicating acceptance of the available carrier to the configured terminal (see step S1030). Of course, in the embodiment of the present application, the non-configured terminal may not send information indicating acceptance of the available carrier to the configured terminal. Accordingly, if the non-configured terminal uses the available carrier within a preset time, it can be determined that the non-configured terminal accepts the available carrier.

[0262] If the non-configured terminal rejects the available carrier, the non-configured terminal may send information indicating the rejection of the available carrier to the configured terminal (see step S1040). Of course, in the embodiment of the present application, the non-configured terminal may not send information indicating the rejection of the available carrier to the configured terminal. Accordingly, if the non-configured terminal does not use the available carrier within a preset time, it can be determined that the non-configured terminal device can reject the available carrier.

[0263] In some scenarios, if the non-configured terminal rejects the available carrier, the configured terminal may send reconfiguration information to the non-configured terminal (see step S1050 ), where the reconfiguration information is used to reconfigure the first carrier and / or the second carrier for the non-configured terminal.

[0264] In some implementations, if a preset condition is met, the reconfiguration process may be considered to have failed. The preset condition may be related to the number of times the configured terminal configures the first carrier and / or the second carrier for the non-configured terminal, and / or the preset condition may be related to the duration of the configuration of the first carrier and / or the second carrier for the non-configured terminal by the configured terminal.

[0265] For example, if the preset condition is related to the number of times the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal, the preset condition may include that the number of times the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal is greater than a threshold.

[0266] For another example, if the preset condition is related to the duration for which the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal, the preset condition may include that the duration for which the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal is greater than a threshold.

[0267] It should be noted that in the embodiments of the present application, there is no limitation on the reasons why a non-configured terminal rejects an available carrier. For example, assuming that the non-configured terminal is terminal device 1, and the configured terminals include terminal device 2 and terminal device 3, terminal device 2 configures terminal device 1 to send first sideline data on carrier 2, and terminal device 3 configures terminal device 1 to send first sideline data on carrier 3. At this time, terminal device 1 needs to send the first sideline data on carrier 2 and carrier 3 respectively, resulting in higher power consumption of terminal device 1. In this case, terminal device 1 can reject the configuration of terminal device 3.

[0268] In addition, the first configuration information and / or the second configuration information may be determined based on the candidate carrier indicated by the non-configuration terminal. In the embodiment of the present application, the first configuration information and / or the second configuration information may be determined autonomously by the configuration terminal, which is not limited in the embodiment of the present application.

[0269] In some implementations, any of the configuration processes described above can be used in conjunction with dynamic activation. That is, after the available carriers configured by the first and / or second configuration information are configured for a non-configured terminal, the configured terminal can send third indication information to the non-configured terminal to indicate whether to activate the configured available carriers. In other words, the third indication information indicates whether to allow the second information to be transmitted via the second carrier.

[0270] For example, terminal device 1 configures carrier set A for terminal device 2. At this time, carrier set A includes one or more available carriers associated with the second information. Afterwards, terminal device 1 can send indication information 3 to terminal device 2 to indicate the carriers in carrier set A that can be used to transmit the second information.

[0271] In the embodiment of the present application, there is no limitation on the carrying method of the third indication information. For example, the third indication information can be carried in a MAC CE. For another example, the third indication information can be carried in an SCI.

[0272] In some implementations, whether the second information is transmitted via the second carrier is determined based on one or more of the following: whether there is a carrier available for transmitting the second information; QoS parameters associated with the first information; communication quality between the first terminal device and the second terminal device; and resource congestion of resources available for transmitting the second information.

[0273] If whether the second information is transmitted via the second carrier is determined based on whether a carrier is available for transmitting the second information, in some implementations, if a carrier is available for transmitting the second information, the second information may be transmitted via the second carrier. In other implementations, if no carrier is available for transmitting the second information, the second information may not be transmitted via the second carrier.

[0274] For example, if only a second carrier exists (i.e., cross-carrier scheduling resources), the second information can be transmitted through the second carrier (i.e., using cross-carrier scheduling). For another example, if the current resource pool is a PSCCH-only resource pool, the second information can be transmitted through the second carrier (i.e., using cross-carrier scheduling). For another example, if the resource pool on the current carrier is a PSCCH-only carrier, the second information can be transmitted through the second carrier (i.e., using cross-carrier scheduling).

[0275] For another example, if the second carrier does not exist (i.e., cross-carrier scheduling resources), the second information may not be transmitted through the second carrier (i.e., cross-carrier scheduling is used). For another example, if the current resource pool is not a PSCCH-only resource pool, the second information may not be transmitted through the second carrier (i.e., cross-carrier scheduling is used). For another example, if the resource pool on the current carrier is not a PSCCH-only carrier, the second information may not be transmitted through the second carrier (i.e., cross-carrier scheduling is used).

[0276] If whether the second information is transmitted via the second carrier is determined based on the QoS parameters associated with the first information, in some implementations, if the QoS parameters associated with the first information have higher requirements, the second information may be transmitted via the second carrier. In other implementations, if the QoS parameters associated with the first information have lower requirements, the second information is not transmitted via the second carrier.

[0277] Alternatively, in some other implementations, if the QoS parameter requirement associated with the first information is relatively low, the second information may be transmitted via the second carrier. In some other implementations, if the QoS parameter requirement associated with the first information is relatively high, the second information is not transmitted via the second carrier.

[0278] For example, the QoS parameter includes transmission delay. If the transmission delay associated with the first information is less than a threshold, the second information may be transmitted via the second carrier. Conversely, if the transmission delay associated with the first information is greater than the threshold, the second information is not transmitted via the second carrier.

[0279] For another example, the QoS parameter includes a packet error rate (PER). If the PER associated with the first information is greater than a threshold, the second information may be transmitted via the second carrier. Conversely, if the PER associated with the first information is less than the threshold, the second information is not transmitted via the second carrier.

[0280] If whether the second information is transmitted via the second carrier is determined based on communication quality, in some implementations, if the communication quality is high, the second information may be transmitted via the second carrier. In other implementations, if the communication quality is low, the second information is not transmitted via the second carrier. Alternatively, in some implementations, if the communication quality is high, the second information may not be transmitted via the second carrier. In other implementations, if the communication quality is low, the second information is transmitted via the second carrier.

[0281] For example, the communication quality is determined based on the packet loss rate. If the packet loss rate is lower than a threshold, the second information may be transmitted via the second carrier. Conversely, if the packet loss rate is higher than the threshold, the second information is not transmitted via the second carrier.

[0282] For example, the communication quality is determined based on the first sidelink data reception status. If the first sidelink data reception status indicates that the data has not been received for x consecutive times, the second information may be transmitted via the second carrier. Conversely, if the first sidelink data reception status indicates that the data has not been received for x consecutive times, the second information may be transmitted via the second carrier. Where x is a positive integer, the second information may not be transmitted via the second carrier.

[0283] If whether the second information is transmitted via the second carrier is determined based on resource congestion, in some implementations, if the resource congestion is severe (e.g., the CBR is higher than a threshold), the second information may not be transmitted via the second carrier. In other implementations, if the resource congestion is less severe (e.g., the CBR is lower than a threshold), the second information is transmitted via the second carrier.

[0284] Of course, in the embodiment of the present application, whether the second information is transmitted via the second carrier may also be determined in other ways. In some implementations, whether the second information is transmitted via the second carrier may be determined based on a preset rule.

[0285] In other implementations, whether the second information is transmitted via the second carrier may be determined based on an upper layer (e.g., NAS) indication. For example, whether the second information is transmitted via the second carrier may be determined based on third information. The third information is described above and will not be described again for the sake of brevity. For another example, whether the second information is transmitted via the second carrier may be determined based on a first association associated with the third information. The first association is described above and will not be described again for the sake of brevity.

[0286] In other implementations, whether the second information is transmitted via the second carrier may be determined based on an AS layer configuration. The AS layer configuration activation may be configured for each bearer, or for each LCH, or for each link, or for each sidelink authorization, or for each configuration authorization. The AS layer configuration may be configured by a network device or other terminal device.

[0287] In other implementations, whether the second information is transmitted via the second carrier may be determined based on a dynamic indication (or indication information). The indication information may be configured by a network device or another terminal device. In addition, the indication information may be carried in one or more of the following: MAC CE, SCI, or DCI.

[0288] It should be noted that the above determination of whether the second information is transmitted via the second carrier may be performed by the first terminal device or the second terminal device. Of course, in the embodiment of the present application, the above determination of whether the second information is transmitted via the second carrier may also be determined by the network device, and the embodiment of the present application does not limit this.

[0289] At present, after the introduction of the cross-carrier scheduling scheme of the embodiment of the present application, how the second timer associated with the SL DRX mechanism works is an urgent problem to be solved. Therefore, in the embodiment of the present application, it is proposed to associate the second timer with the first carrier, and / or the second timer with the second carrier, wherein the second timer for SL DRX is associated with the transmission of the second information.

[0290] In some implementations, the second timer is used to determine the inactivity time of the second terminal device, and the second timer may be, for example, an "inactivity timer." In other implementations, the second timer is used to determine the round-trip time for transmitting the first information, and the second timer may be, for example, an "RTT timer."

[0291] For example, the inactivity timer and / or RTT timer may be started only according to the transmission on the scheduled carrier (first carrier), and the retransmission timer may be started after the RTT timer times out, and the data transmission on the scheduled and scheduled carriers (first carrier and second carrier) may be monitored during the operation of the inactivity timer and the retransmission timer.

[0292] For another example, an inactivity timer may be turned on for transmissions on the scheduled or scheduled carrier (the first carrier and the second carrier), and a retransmission timer may be turned on after the RTT timer expires, and data transmissions on the scheduled and scheduled carriers may be monitored while the inactivity timer and the retransmission timer are running.

[0293] For another example, an inactivity timer and a retransmission timer may be turned on for transmission on the scheduled or scheduled carrier (the first carrier and the second carrier), and data transmission on the scheduled and scheduled carriers may be monitored while the inactivity timer and the retransmission timer are running.

[0294] At present, when the third side-line data and the fourth side-line data are transmitted between the first terminal device and the second terminal device, they need to be transmitted through the same carrier, resulting in poor flexibility of the third side-line data and the fourth side-line data. Among them, the fourth side-line data is the retransmission data of the third side-line data. Therefore, in response to the above problem, an embodiment of the present application provides a side-line communication method, in which the third side-line data and the fourth side-line data can be transmitted through different carriers (for example, the first carrier and the second carrier), which helps to improve the flexibility of the third side-line data and the fourth side-line data transmission. For ease of understanding, the side-line communication method of an embodiment of the present application is introduced in conjunction with Example 3 below.

[0295] Embodiment 3: Assume that the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmitted data of the first sideline data.

[0296] In some implementations, the third sideline data may be initially transmitted sideline data, or the third sideline data may be retransmitted sideline data.

[0297] As described above, the third sideline data and the fourth sideline data can be transmitted via different carriers. Therefore, determining the second carrier used to transmit the fourth sideline data is an urgent issue. Therefore, to address this issue, embodiments of the present application propose that the second carrier can be determined based on some information shared by the first terminal device and the second terminal device (hereinafter referred to as "third information").

[0298] That is to say, the second carrier can be determined based on the third information, wherein the third information includes one or more of the following: information on the target service type, information on the target service, information on the target application type, information on the target application, layer 2 information, sending configuration, information on the target QoS flow, and data transmission type.

[0299] Taking the third information including the target service type as an example, the target service type can be, for example, the service type of the service to which the third side data belongs. The target service type can include, for example, a rate-priority service type, a reliability-priority service type, etc., which is not limited in this embodiment of the present application.

[0300] In some implementations, the target service type information may be used to indicate the target service type. For example, the target service type information may be an index of the target service type.

[0301] Taking the example where the third information includes information about a target service, the target service may be, for example, a service to which the third sideline data belongs. In some implementations, the information about the target service is used to indicate the target service, for example, the information about the target service may be an index of the target service.

[0302] Taking the example where the third information includes information about the target application type, the target application type may be the application type of the application to which the third sideline data belongs. In some implementations, the information about the target application type may be used to indicate the target application type, for example, the information about the target application type may be an index of the target application type.

[0303] Taking the example where the third information includes information about a target application, the target application may be, for example, the application type of the application to which the third sideline data belongs. In some implementations, the information about the target application may be used to indicate the target application, for example, the information about the target application may be an index of the target application.

[0304] Taking the example that the third information includes layer 2 information, the layer 2 information can be associated with the third sideline data. In some implementations, the communication device that transmits the third sideline data via layer 2, for example, the layer 2 information can include a layer 2 index.

[0305] Taking the example of the third information including transmission configuration (Tx profile) information, the transmission configuration information may be associated with the third sideline data. In some implementations, the transmission configuration information may be used to indicate the transmission configuration of the third sideline data. For example, the transmission configuration may include information indicating the transmission configuration. In another example, the transmission configuration may include transmission configuration parameters for the third sideline data.

[0306] Taking the example where the third information includes information about a target QoS flow, the target QoS flow may be, for example, a QoS flow where the third sidelink data resides. In some implementations, the information about the target QoS flow may be used to indicate the target QoS flow. For example, the information about the target QoS flow may include an identifier of the target QoS flow.

[0307] For example, if the third information includes information about a data transmission type, the data transmission type may be, for example, the data transmission type of the third sidelink data, where the data transmission type may include one or more of unicast, multicast, and broadcast. In some implementations, the data transmission type information may be used to indicate the data transmission type. For example, the data transmission type information may include an identifier of the data transmission type.

[0308] In some implementations, the second carrier is determined based on a first association between the second carrier and the third information. That is, by establishing an association between the carrier and the third information, the carrier associated with the third information of the first terminal device can be determined, where the carrier associated with the third information of the first terminal device is the second carrier.

[0309] In some implementations, the first association may be an association between the third information and carrier indication information, where the carrier indication information may be a carrier index, a carrier sequence number, or the like. Taking the example of the third information including target service type information, the first association may include an association between the target service type information and the carrier indication information. Taking the example of the third information including target service information, the first association may include an association between the target service information and the carrier indication information. Taking the example of the third information including target application type information, the first association may include an association between the target application type information and the carrier indication information. Taking the example of the third information including layer 2 information, the first association may include an association between the layer 2 information and the carrier indication information. Taking the example of the third information including transmission configuration, the first association may include an association between the transmission configuration and the carrier indication information. Taking the example of the third information including target QoS flow information, the first association may include an association between the target QoS flow information and the carrier indication information. Taking the example of the third information including data transmission type, the first association may include an association between the data transmission type and the carrier indication information.

[0310] It should be noted that the carrier associated with the third information in the first association relationship may be one or more available carriers. That is, the third information in the first association relationship may be associated with a carrier set, which may include one or more available carriers. For example, the second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, where the first carrier set includes one or more carriers that can be used to transmit the fourth sidelink data.

[0311] In addition, in an embodiment of the present application, the available carriers associated with the third information of the first terminal device may include a carrier that carries the fourth sidelink data, that is, the second carrier.

[0312] In some implementations, the first association relationship may be defined by an upper layer of the first terminal device and / or the second terminal device, or in other words, the first association relationship may be applied to an upper layer of the first terminal device and / or the second terminal device. For example, the first association relationship may be defined by a NAS layer. For another example, the first association relationship may be defined by a V2X layer. For another example, the first association relationship may be defined by a proximity based services (ProSe) layer.

[0313] It should be noted that the first carrier can be determined based on the association relationship between the third information and the first carrier. The way of establishing the association relationship is similar to the way of establishing the first association relationship above. For the sake of brevity, it will not be repeated here.

[0314] In some scenarios, after determining the available carrier for the fourth sidelink data, it is also necessary to determine the sidelink resources (or, time-frequency resources for transmitting the fourth sidelink data) and / or the second carrier for transmitting the fourth sidelink data. In some implementations, the time-frequency resources for transmitting the fourth sidelink data belong to a second resource pool corresponding to the second carrier, where the second carrier and / or the second resource pool are determined based on the fourth information.

[0315] In some implementations, the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool, information about the target wireless bearer, target data priority, congestion level of the first resource pool, and predefined information.

[0316] For example, if the fourth information includes information about the first carrier, the first carrier is used to transmit third-side data. Therefore, the first carrier can also be referred to as a "data transmission carrier." In some implementations, the information about the first carrier can be used to indicate the first carrier. For example, the information about the first carrier can be the sequence number of the first carrier.

[0317] Taking the example where the fourth information includes information about a logical channel, the logical channel may be, for example, the logical channel where the third sidelink data is located. In some implementations, the information about the logical channel may be used to indicate the logical channel. For example, the information about the logical channel may include an identifier of the logical channel.

[0318] Taking the example where the fourth information includes information about the first resource pool, the first resource pool may be, for example, a resource pool used to transmit the third sideline data. In some implementations, the information about the first resource pool may be used to indicate the first resource pool. For example, the information about the first resource pool may include an identifier of the first resource pool.

[0319] Taking the example where the fourth information includes information about a target radio bearer, the target radio bearer may be, for example, a radio bearer used to transmit third sidelink data. In some implementations, the target radio bearer information may be used to indicate the target radio bearer. For example, the target radio bearer information may include an identifier of the target radio bearer.

[0320] Taking the example of the fourth information including target data priority information, the target data priority information may be, for example, the data priority information of the third side row data. In some implementations, the target data priority information may be used to indicate the data priority information of the third side row data. For example, the target data priority information may include a target data priority level. For another example, the target data priority information may include an identifier of the target data priority.

[0321] Taking the example where the fourth information includes the congestion level of the first resource pool, the first resource pool may be a resource pool for transmitting the third sidelink data. In some implementations, the congestion level of the first resource pool may be determined by the CBR in the first resource pool.

[0322] Taking the example of the fourth information including predefined information, in some implementations, the predefined information may be used to indicate one or more available carriers, where the available carriers may be understood as carriers that may be used to transmit the third sideline data. In other implementations, the predefined information may be used to indicate one or more available resource pools, where the available resource pools may be understood as resource pools that may be used to transmit the third sideline data.

[0323] It should be noted that the above predefined information can be replaced by preconfigured information, wherein the preconfigured information can be preconfigured by the network device. Of course, the above predefined information can be replaced by default information, that is, the above available carriers and / or available resource pools can be default.

[0324] In some implementations, the second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information. Of course, in an embodiment of the present application, the second association relationship may also include an association relationship between the second resource pool and the fourth information. In other words, the carrier associated with the fourth information of the first terminal device and the resource pool within the carrier can be determined by establishing a second association relationship, wherein the carrier associated with the fourth information of the first terminal device is the second carrier, and the resource pool associated with the fourth information of the first terminal device is the second resource pool.

[0325] In some implementations, the second association relationship may include an association relationship between a second carrier and fourth information, where the second carrier may be represented by indication information of the second carrier. That is, the carrier in the second association relationship may be represented by a carrier index, a carrier sequence number, or the like. Taking the example of the fourth information including information about a first carrier, the second association relationship may include an association relationship between the information about the first carrier and the indication information of the carrier. Taking the example of the fourth information including information about a target QoS flow, the second association relationship may include an association relationship between the information about the target QoS flow and the indication information of the carrier. Taking the example of the fourth information including information about a logical channel, the second association relationship may include an association relationship between the information about the logical channel and the indication information of the carrier. Taking the example of the fourth information including information about a first resource pool, the second association relationship may include an association relationship between the information about the first resource pool and the indication information of the carrier. Taking the example of the fourth information including information about a target radio bearer, the second association relationship may include an association relationship between the information about the target radio bearer and the indication information of the carrier. Taking the example of the fourth information including target data priority, the second association relationship may include an association relationship between the target data priority and the indication information of the carrier. Taking the fourth information including the congestion level of the first resource pool as an example, the second association relationship may include an association relationship between the congestion level of the first resource pool and the indication information of the carrier.

[0326] It should be noted that the carrier associated with the fourth information in the above-mentioned second association relationship can be one or more available carriers. That is, the fourth information in the above-mentioned second association relationship can be associated with a carrier set (also referred to as a "second carrier set"), which can include one or more available carriers. In other words, the second association relationship includes the association relationship between the second resource pool and the second carrier set, and the association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the fourth sidelink data.

[0327] In addition, in an embodiment of the present application, the available carriers associated with the fourth information of the first terminal device may include a carrier carrying the fourth sidelink data, that is, the second carrier.

[0328] In some implementations, the second association relationship may be defined by the access layer (AS layer) of the first terminal device and / or the second terminal device. Of course, in the embodiment of the present application, the second association relationship may also be defined by other layers, which is not limited in the embodiment of the present application.

[0329] It should be noted that the resource pool used to transmit the fourth sidelink data can be determined based on the association between the fourth information and the first carrier. The way to establish the association is similar to the way to establish the second association above. For the sake of brevity, it will not be repeated here.

[0330] The above describes the method for determining the second carrier in combination with the third information and the fourth information respectively. In an embodiment of the present application, the above method for determining the second carrier can be used alone. Of course, in an embodiment of the present application, the above method for determining the second carrier can also be used in combination with each other. For example, an association relationship with an available carrier can be established through the third information and the fourth information, and then the second carrier can be selected from the available carriers. For another example, an association relationship with an available carrier can be established through the fourth information and the fifth information, and then the second carrier can be selected from the available carriers. For another example, an association relationship with an available carrier can be established through the third information and the fifth information, and then the second carrier can be selected from the available carriers. Among them, the combination of the above three types of information can be pre-configured, pre-defined, configured by a network device, or determined by negotiation between the first terminal device and the second terminal device, and the embodiment of the present application is not limited to this.

[0331] In addition, in an embodiment of the present application, the various association relationships involved above (for example, the first association relationship, the second association relationship, and the third association relationship) can be applied to the scenario of unicast communication between the first terminal device and the second terminal device, or to the scenario of multicast communication between the first terminal device and the second terminal device, or to the scenario of broadcast communication between the first terminal device and the second terminal device.

[0332] In some implementations, the first terminal device may also dynamically indicate the second carrier to the second terminal device. That is, the method further includes: the first terminal device sending first indication information to the second terminal device, where the first indication information is used to indicate the second carrier. The first indication information may be carried in a first-order SCI and / or a second-order SCI. Of course, the first indication information may also be dedicated information transmitted independently, which is not limited in this embodiment of the present application.

[0333] In some implementations, the first indication information includes one or more of the following: indication information of the second carrier; indication information of the second resource pool; indication information of the time domain resources used to transmit the fourth sideline data; and indication information of the frequency domain resources used to transmit the fourth sideline data.

[0334] The indication information of the second carrier may include, for example, an identifier of the second carrier, a sequence number of the second carrier, etc. In some implementations, the indication information of the second carrier may include a carrier indication CIF.

[0335] The indication information of the second resource pool is also called the second resource pool indication.

[0336] The above-mentioned indication information of the time domain resources used to transmit the fourth sideline data, or the indication information of the time domain resources that can be used to transmit the fourth sideline data, wherein the indication information of the time domain resources is also called the indication of the time domain resources, for example, the indication information of the time domain resources may include the index of the symbol used to transmit the fourth sideline data.

[0337] The above-mentioned indication information of the frequency domain resources used to transmit the fourth sideline data, or the indication information of the frequency domain resources that can be used to transmit the fourth sideline data. The indication information of the frequency domain resources is also called the indication of the frequency domain resources. For example, the indication information of the frequency domain resources may include the index of the symbol used to transmit the fourth sideline data.

[0338] It should be noted that the above solution for dynamically indicating the second carrier can also be applied to dynamically indicating the first carrier, and the specific indication method is similar to the above solution for indicating the second carrier. For the sake of brevity, it will not be repeated here.

[0339] In some implementations, the first terminal device and the second terminal device may determine the first carrier and / or the second carrier through negotiation. In other words, the first carrier and / or the second carrier are determined based on negotiation between the first terminal device and the second terminal device.

[0340] In some implementations, the negotiation may be performed through capability exchange between the first terminal device and the second terminal device. The capability exchange may be the first terminal device indicating capability information of the first terminal device to the second terminal device. That is, the method further includes: the first terminal device sending the capability information of the first terminal device to the second terminal device, where the capability information of the first terminal device indicates carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device.

[0341] The above-mentioned capability interaction may be that the second terminal device indicates the capability information of the second terminal device to the first terminal device, that is, the above-mentioned method also includes: the second terminal device sends the capability information of the second terminal device to the first terminal device, and the capability information of the second terminal device is used to indicate the carrier supported by the second terminal device and / or the number of carriers supported by the second terminal device.

[0342] Of course, in the embodiment of the present application, capability interaction may include the first terminal device indicating the capability information of the first terminal device to the second terminal device, and the second terminal device indicating the capability information of the second terminal device to the first terminal device. The embodiment of the present application does not limit the order of transmission between the capability information of the first terminal device and the capability information of the second terminal device. For example, the capability information of the first terminal device may be transmitted before the capability information of the second terminal device. For another example, the capability information of the second terminal device may be transmitted before the capability information of the first terminal device. For another example, the capability information of the second terminal device and the capability information of the first terminal device may be transmitted simultaneously.

[0343] In some implementations, the first terminal device may determine the first carrier and / or the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device. For example, the capability information of the first terminal device indicates that the first terminal device supports carriers 1 to 3, and the capability information of the second terminal device indicates that the second terminal device supports carriers 2 to 3. At this time, the first terminal device may select carriers 2 to 3 as the first carrier and the second carrier. Of course, in an embodiment of the present application, the second terminal device may also determine the first carrier and / or the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device. Alternatively, in an embodiment of the present application, the second terminal device determines the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device, and the first terminal device determines the first carrier based on the capability information of the first terminal device and the capability information of the second terminal device. Alternatively, the second terminal device determines the first carrier based on the capability information of the first terminal device and the capability information of the second terminal device, and the first terminal device determines the second carrier based on the capability information of the first terminal device and the capability information of the second terminal device.

[0344] In some implementations, the negotiation may be implemented through one or more signaling interactions transmitted between the first terminal device and the second terminal device. For ease of understanding, the following description is provided in conjunction with FIG10 , where the signaling may, for example, include first configuration information. That is, the method further includes: the first terminal device sending first configuration information to the second terminal device (see step S1010), where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device.

[0345] In some implementations, the first configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the third sidelink data and / or the fourth sidelink data. Of course, in the embodiment of the present application, the first configuration information can directly configure the first carrier and / or the second carrier.

[0346] In the embodiment of the present application, the first configuration information can be carried by PC5-RRC. Of course, in the embodiment of the present application, the first configuration information can also be carried by dedicated signaling, which is not limited in the embodiment of the present application.

[0347] The above signaling may, for example, include second configuration information, that is, the above method also includes: the second terminal device sends second configuration information to the first terminal device (see step S1010), and the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

[0348] In the embodiment of the present application, the second configuration information can be carried by PC5-RRC. Of course, in the embodiment of the present application, the second configuration information can also be carried by dedicated signaling, which is not limited in the embodiment of the present application.

[0349] In some implementations, the second configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the third sidelink data and / or the fourth sidelink data. Of course, in this embodiment of the present application, the second configuration information can directly configure the first carrier and / or the second carrier.

[0350] For ease of description, the terminal device that sends the first configuration information and / or the second configuration information is referred to as a "configured terminal," and the terminal device that receives the first configuration information and / or the second configuration information is referred to as a "non-configured terminal." In other words, for the first configuration information, the configured terminal is the first terminal device, and the non-configured terminal is the second terminal device. For the second configuration information, the configured terminal is the second terminal device, and the non-configured terminal is the first terminal device.

[0351] In some scenarios, the non-configured terminal may send a recommended carrier to the configured terminal (see step S1020) to improve the rationality of the carrier configuration of the configured terminal. In other words, before transmitting the first configuration information and / or the second configuration information, the non-configured terminal may send a second indication information to the configured terminal device. The second indication information is used to indicate the available carrier (also known as a "candidate carrier") recommended by the non-configured terminal. The candidate carrier is used to configure the terminal device to configure the first carrier and / or the second carrier.

[0352] In some scenarios, after receiving an available carrier configured by a configured terminal device, a non-configured terminal device may find that the available carrier is not suitable. In this case, the non-configured terminal device can reject the available carrier. Of course, if the available carrier is suitable, the non-configured terminal device can accept the available carrier.

[0353] If the non-configured terminal device accepts the available carrier, the non-configured terminal may send information indicating acceptance of the available carrier to the configured terminal (see step S1030). Of course, in the embodiment of the present application, the non-configured terminal may not send information indicating acceptance of the available carrier to the configured terminal. Accordingly, if the non-configured terminal uses the available carrier within a preset time, it can be determined that the non-configured terminal accepts the available carrier.

[0354] If the non-configured terminal rejects the available carrier, the non-configured terminal may send information indicating the rejection of the available carrier to the configured terminal (see step S1040). Of course, in the embodiment of the present application, the non-configured terminal may not send information indicating the rejection of the available carrier to the configured terminal. Accordingly, if the non-configured terminal does not use the available carrier within a preset time, it can be determined that the non-configured terminal device can reject the available carrier.

[0355] In some scenarios, if the non-configured terminal rejects the available carrier, the configured terminal may send reconfiguration information to the non-configured terminal (see step S1050 ), where the reconfiguration information is used to reconfigure the first carrier and / or the second carrier for the non-configured terminal.

[0356] In some implementations, if a preset condition is met, the reconfiguration process may be considered to have failed. The preset condition may be related to the number of times the configured terminal configures the first carrier and / or the second carrier for the non-configured terminal, and / or the preset condition may be related to the duration of the configuration of the first carrier and / or the second carrier for the non-configured terminal by the configured terminal.

[0357] For example, if the preset condition is related to the number of times the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal, the preset condition may include that the number of times the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal is greater than a threshold.

[0358] For another example, if the preset condition is related to the duration for which the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal, the preset condition may include that the duration for which the configuration terminal configures the first carrier and / or the second carrier for the non-configuration terminal is greater than a threshold.

[0359] It should be noted that in the embodiments of the present application, the reasons for a non-configured terminal to reject an available carrier are not limited. For example, assuming that the non-configured terminal is terminal device 1, and the configured terminals include terminal device 2 and terminal device 3, in this case, terminal device 2 configures terminal device 1 to receive the fourth sideline data on carrier 2, and terminal device 3 configures terminal device 1 to receive the fourth sideline data on carrier 3. In this case, terminal device 1 needs to receive the fourth sideline data on carrier 2 and carrier 3 respectively, resulting in higher power consumption of terminal device 1. In this case, terminal device 1 can reject the configuration of terminal device 3.

[0360] In addition, the first configuration information and / or the second configuration information may be determined based on the candidate carrier indicated by the non-configuration terminal. In the embodiment of the present application, the first configuration information and / or the second configuration information may be determined autonomously by the configuration terminal, which is not limited in the embodiment of the present application.

[0361] In some implementations, any of the configuration processes described above can be used in conjunction with dynamic activation. That is, after the available carriers configured by the first and / or second configuration information are configured for a non-configured terminal, the configured terminal can send third indication information to the non-configured terminal to indicate whether to activate the configured available carriers. Alternatively, the third indication information indicates whether to allow the fourth sidelink data to be transmitted via the second carrier.

[0362] For example, terminal device 1 configures carrier set A for terminal device 2. At this time, carrier set A includes one or more available carriers associated with fourth side data. Afterwards, terminal device 1 can send indication information 3 to terminal device 2 to indicate the carriers in carrier set A that can be used to transmit fourth side data.

[0363] In the embodiment of the present application, there is no limitation on the carrying method of the third indication information. For example, the third indication information can be carried in a MAC CE. For another example, the third indication information can be carried in an SCI.

[0364] In some implementations, whether the fourth sideline data is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier that can be used to transmit the fourth sideline data; QoS parameters associated with the third sideline data; communication quality between the first terminal device and the second terminal device; and resource congestion of resources that can be used to transmit the fourth sideline data.

[0365] Whether the fourth sideline data is transmitted via the second carrier is determined based on whether a carrier available for transmitting the fourth sideline data exists. In some implementations, if a carrier available for transmitting the fourth sideline data exists, the fourth sideline data may be transmitted via the second carrier. In other implementations, if no carrier available for transmitting the fourth sideline data exists, the fourth sideline data may not be transmitted via the second carrier.

[0366] For example, if only the second carrier (i.e., cross-carrier retransmission resources) exists, the fourth sidelink data may be transmitted via the second carrier (i.e., using cross-carrier retransmission). For another example, if the second carrier (i.e., cross-carrier retransmission resources) does not exist, the fourth sidelink data may not be transmitted via the second carrier (i.e., using cross-carrier retransmission).

[0367] If whether the fourth sideline data is transmitted via the second carrier is determined based on the QoS parameter associated with the third sideline data, in some implementations, if the QoS parameter associated with the third sideline data has a higher requirement, the fourth sideline data may be transmitted via the second carrier. In other implementations, if the QoS parameter associated with the third sideline data has a lower requirement, the fourth sideline data is not transmitted via the second carrier.

[0368] Alternatively, in some other implementations, if the QoS parameter requirement associated with the third sideline data is relatively low, the fourth sideline data may be transmitted via the second carrier. In some other implementations, if the QoS parameter requirement associated with the third sideline data is relatively high, the fourth sideline data is not transmitted via the second carrier.

[0369] For example, the QoS parameter includes transmission delay. If the transmission delay associated with the third sideline data is less than a threshold, the fourth sideline data may be transmitted via the second carrier. Conversely, if the transmission delay associated with the third sideline data is greater than the threshold, the fourth sideline data is not transmitted via the second carrier.

[0370] For another example, the QoS parameter includes a packet error rate (PER). If the PER associated with the third sidelink data is greater than a threshold, the fourth sidelink data may be transmitted via the second carrier. Conversely, if the PER associated with the third sidelink data is less than the threshold, the fourth sidelink data is not transmitted via the second carrier.

[0371] If whether the fourth sideline data is transmitted via the second carrier is determined based on communication quality, in some implementations, if the communication quality is high, the fourth sideline data may be transmitted via the second carrier. In other implementations, if the communication quality is low, the fourth sideline data is not transmitted via the second carrier. Alternatively, in some implementations, if the communication quality is high, the fourth sideline data may not be transmitted via the second carrier. In other implementations, if the communication quality is low, the fourth sideline data is transmitted via the second carrier.

[0372] For example, the communication quality is determined based on the packet loss rate. If the packet loss rate is lower than a threshold, the fourth sidelink data may be transmitted via the second carrier. Conversely, if the packet loss rate is higher than the threshold, the fourth sidelink data is not transmitted via the second carrier.

[0373] For example, the communication quality is determined based on the reception status of the fourth sideline data. If the reception status of the fourth sideline data indicates that it has not been received for x consecutive times, the fourth sideline data is activated, and x is greater than a threshold, then the fourth sideline data can be transmitted via the second carrier. Conversely, if the reception status of the fourth sideline data indicates that it has not been received for x consecutive times, the fourth sideline data is activated, and x is less than a threshold, then the fourth sideline data is not transmitted via the second carrier, where x is a positive integer.

[0374] If whether the fourth sidelink data is transmitted via the second carrier is determined based on resource congestion, in some implementations, if the resource congestion is severe (e.g., the CBR is higher than a threshold), the fourth sidelink data may not be transmitted via the second carrier. In other implementations, if the resource congestion is less severe (e.g., the CBR is lower than a threshold), the fourth sidelink data is transmitted via the second carrier.

[0375] Of course, in the embodiment of the present application, whether the fourth sideline data is transmitted via the second carrier may be determined in other ways. In some implementations, whether the fourth sideline data is transmitted via the second carrier may be determined based on a preset rule.

[0376] In other implementations, whether the fourth sidelink data is transmitted via the second carrier may be determined based on an upper layer (e.g., NAS) indication. For example, whether the fourth sidelink data is transmitted via the second carrier may be determined based on third information. The third information is described above and will not be described again for brevity. For another example, whether the fourth sidelink data is transmitted via the second carrier may be determined based on a first association associated with the third information. The first association is described above and will not be described again for brevity.

[0377] In other implementations, whether the fourth sideline data is transmitted through the second carrier may be determined based on the AS layer configuration. The AS layer configuration activation may be configured for each bearer, or the AS layer configuration activation may be configured for each LCH, or the AS layer configuration activation may be configured for each link, or the AS layer configuration activation may be configured for each sideline grant, or the AS layer configuration activation may be configured for each configured grant (CG). The AS layer configuration may be configured by a network device or other terminal device.

[0378] In other implementations, whether the fourth sidelink data is transmitted via the second carrier may be determined based on a dynamic indication (or indication information). The indication information may be configured by a network device or another terminal device. Furthermore, the indication information may be carried in one or more of the following: MAC CE, SCI, or DCI.

[0379] It should be noted that the above determination of whether the fourth sidelink data is transmitted via the second carrier may be performed by the first terminal device or the second terminal device. Of course, in the embodiment of the present application, the above determination of whether the fourth sidelink data is transmitted via the second carrier may also be determined by the network device, and the embodiment of the present application is not limited to this.

[0380] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 10. The device embodiment of the present application is described in detail below in conjunction with Figures 11 to 13. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0381] FIG11 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 1100 shown in FIG11 is a second terminal device. The terminal device 1100 includes a communication unit 1110 .

[0382] The communication unit 1110 is configured to send first information to a second terminal device via a first carrier;

[0383] The communication unit 1110 is configured to receive or send second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

[0384] In some implementations, the second carrier is determined based on third information, where the third information includes one or more of: target service type information, target service information, target application type information, target application information, layer 2 information, transmission configuration information, target QoS flow information, and data transmission type information.

[0385] In some implementations, the second carrier is determined based on a first association relationship between the second carrier and the third information.

[0386] In some implementations, the second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the first information, wherein the first carrier set includes one or more carriers that can be used to transmit the second information.

[0387] In some implementations, the time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, and the second resource pool and / or the second carrier are determined based on fourth information, and the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool used to transmit the first information, information about the target wireless bearer, target data priority, the congestion level of the first resource pool, and predefined information.

[0388] In some implementations, the second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information.

[0389] In some implementations, the second association relationship includes an association relationship between the second resource pool and the second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

[0390] In some implementations, the second carrier is determined based on one or more of the following fifth information, and the fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool, wherein the first resource pool is used to transmit the first information and the second resource pool is used to transmit the second information.

[0391] In some implementations, the second carrier belongs to a third carrier set, where the third carrier set is determined based on the fifth information, wherein the third carrier set includes one or more carriers that can be used to transmit the second information.

[0392] In some implementations, the sending unit is further used to: send first indication information to the second terminal device, where the first indication information is used to indicate the second carrier.

[0393] In some implementations, the first indication information includes one or more of the following: indication information of the second carrier; indication information of the second resource pool used to transmit the second information; indication information of the time domain resources used to transmit the second information; and indication information of the frequency domain resources used to transmit the second information.

[0394] In some implementations, the first carrier and / or the second carrier are determined based on a negotiation between the first terminal device and the second terminal device.

[0395] In some implementations, the sending unit is used to send capability information of the first terminal device to the second terminal device, where the capability information of the first terminal device is used to indicate the carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device; and / or the receiving unit is used to receive capability information of the second terminal device sent by the second terminal device, where the capability information of the second terminal device is used to indicate the carriers supported by the second terminal device and / or the number of carriers supported by the second terminal device.

[0396] In some implementations, the sending unit is used to send first configuration information to the second terminal device, where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device; and / or the receiving unit is used to receive second configuration information sent by the second terminal device, where the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

[0397] In some implementations, the first configuration information and / or the second configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information.

[0398] In some implementations, the carrier in the fourth carrier set used to transmit the first information and / or the second information is determined based on second indication information, and the second indication information is indicated by the first terminal device and / or the second terminal device.

[0399] In some implementations, the sending unit is used to receive the third indication information, or the receiving unit is used to receive or send the third indication information, wherein the third indication information is used to indicate whether the second information is allowed to be transmitted through the second carrier.

[0400] In some implementations, whether the second information is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier that can be used to transmit the second information; QoS parameters associated with the first information; the communication quality between the first terminal device and the second terminal device; and resource congestion of resources that can be used to transmit the second information.

[0401] In some implementations, the first information includes sidelink data, and the second information includes feedback information for the sidelink data; and / or the first information is carried on a first PSSCH, and the second information is carried on a first PSFCH associated with the first PSSCH.

[0402] In some implementations, the second carrier is one of a plurality of carriers, the second information is one of a plurality of second information, and the plurality of second information are respectively transmitted through the plurality of carriers.

[0403] In some implementations, a radio link failure (RLF) of a radio link used to transmit the first information is determined based on unsuccessful reception information in a target carrier, where the target carrier is one of the multiple carriers, or the target carrier includes the multiple carriers.

[0404] In some implementations, the transmission of the first information and / or the second information is associated with a first timer for SL DRX, and the start of the first timer is determined based on one or more of the following: PSFCH resources on the first carrier; PSFCH resources with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, and the multiple carriers include the second carrier; PSFCH resources on the carrier with the highest priority among the multiple carriers; PSFCH resources on the main carrier among the multiple carriers.

[0405] In some implementations, the first timer is used to determine a round trip time for transmitting the first information, or the first timer is used to determine a retransmission time of the first information.

[0406] In some implementations, the second information includes first sidelink data, and the first information includes first sidelink control information for scheduling the first sidelink data; and / or the second information is carried on a second PSSCH, and the first information is carried on a first PSCCH for scheduling the second PSSCH.

[0407] In some implementations, the first information further includes second sideline data scheduled by the first sideline control information; or the second information further includes second sideline control information associated with the first sideline data.

[0408] In some implementations, the first information is transmitted through a first resource pool and the second information is transmitted through a second resource pool, wherein the first resource pool is used to transmit PSCCH and the second resource pool is used to transmit PSSCH; or the first resource pool is used to transmit sidelink control information and the second resource pool is used to transmit sidelink data.

[0409] In some implementations, the sidelink resource for transmitting the second information is determined based on a resource detection result, where the resource detection result includes a resource detection result of the first resource pool and / or a resource detection result of the second resource pool.

[0410] In some implementations, the transmission of the second information is associated with a second timer for SL DRX, the second timer is associated with the first carrier, and / or the second timer is associated with the second carrier.

[0411] In some implementations, the second timer is used to determine an inactive time of the second terminal device, or the second timer is used to determine a round-trip time for transmitting the first information.

[0412] In some implementations, if the first terminal device sends the second information, the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmitted data of the first sideline data.

[0413] In some implementations, the first sidelink data is initially transmitted data, or the first sidelink data is retransmitted data.

[0414] FIG12 is a schematic diagram of a terminal device according to another embodiment of the present application. The terminal device 1200 shown in FIG12 is a second terminal device. The terminal device 1200 includes: a communication unit 1210 .

[0415] The communication unit 1210 is configured to receive first information sent by a first terminal device through a first carrier;

[0416] The communication unit 1210 is configured to receive or send second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

[0417] In some implementations, the second carrier is determined based on third information, where the third information includes one or more of: target service type information, target service information, target application type information, target application information, layer 2 information, transmission configuration information, target QoS flow information, and data transmission type information.

[0418] In some implementations, the second carrier is determined based on a first association relationship between the second carrier and the third information.

[0419] In some implementations, the second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, wherein the first carrier set includes one or more carriers that can be used to transmit the second information.

[0420] In some implementations, the time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, and the second resource pool and / or the second carrier are determined based on fourth information, and the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool used to transmit the first information, information about the target wireless bearer, target data priority, the congestion level of the first resource pool, and predefined information.

[0421] In some implementations, the second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information.

[0422] In some implementations, the second association relationship includes an association relationship between the second resource pool and the second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

[0423] In some implementations, the second carrier is determined based on one or more of the following fifth information, and the fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool, wherein the first resource pool is used to transmit the first information and the second resource pool is used to transmit the second information.

[0424] In some implementations, the second carrier belongs to a third carrier set, where the third carrier set is determined based on the fifth information, wherein the third carrier set includes one or more carriers that can be used to transmit the second information.

[0425] In some implementations, the receiving unit is further used to receive first indication information sent by the first terminal device, where the first indication information is used to indicate the second carrier.

[0426] In some implementations, the first indication information includes one or more of the following: indication information of the second carrier; indication information of the second resource pool used to transmit the second information; indication information of the time domain resources used to transmit the second information; and indication information of the frequency domain resources used to transmit the second information.

[0427] In some implementations, the first carrier and / or the second carrier are determined based on a negotiation between the first terminal device and the second terminal device.

[0428] In some implementations, the receiving unit is further used to receive capability information of the first terminal device sent by the first terminal device, where the capability information of the first terminal device is used to indicate the carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device; and / or the sending unit is further used to send capability information of the second terminal device to the first terminal device, where the capability information of the second terminal device is used to indicate the carriers supported by the second terminal device and / or the number of carriers supported by the second terminal device.

[0429] In some implementations, the receiving unit is further used to receive first configuration information sent by the first terminal device, and the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device; and / or the sending unit is further used to send second configuration information to the first terminal device, and the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

[0430] In some implementations, the first configuration information and / or the second configuration information is used to configure a fourth carrier set, where the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information.

[0431] In some implementations, the carrier in the fourth carrier set used to transmit the first information and / or the second information is determined based on second indication information, and the second indication information is indicated by the first terminal device and / or the second terminal device.

[0432] In some implementations, the sending unit is configured to send third indication information, or the receiving unit is configured to receive the third indication information, wherein the third indication information is used to indicate whether the second information is allowed to be transmitted through the second carrier.

[0433] In some implementations, whether the second information is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier that can be used to transmit the second information; QoS parameters associated with the first information; the communication quality between the first terminal device and the second terminal device; and resource congestion of resources that can be used to transmit the second information.

[0434] In some implementations, the first information includes sidelink data, and the second information includes feedback information for the sidelink data; and / or the first information is carried on a first PSSCH, and the second information is carried on a first PSFCH associated with the first PSSCH.

[0435] In some implementations, the second carrier is one of a plurality of carriers, the second information is one of a plurality of second information, and the plurality of second information are respectively transmitted through the plurality of carriers.

[0436] In some implementations, a radio link failure (RLF) of a radio link used to transmit the first information is determined based on unsuccessful reception information in a target carrier, where the target carrier is one of the multiple carriers, or the target carrier includes the multiple carriers.

[0437] In some implementations, the transmission of the first information and / or the second information is associated with a first timer for SL DRX, and the start of the first timer is determined based on one or more of the following: PSFCH resources on the first carrier; PSFCH resources with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, and the multiple carriers include the second carrier; PSFCH resources on the carrier with the highest priority among the multiple carriers; PSFCH resources on the main carrier among the multiple carriers.

[0438] In some implementations, the first timer is used to determine a round trip time for transmitting the first information, or the first timer is used to determine a retransmission time of the first information.

[0439] In some implementations, the second information includes first sidelink data, and the first information includes first sidelink control information for scheduling the first sidelink data; and / or the second information is carried on a second PSSCH, and the first information is carried on a first PSCCH for scheduling the second PSSCH.

[0440] In some implementations, the first information further includes second sideline data scheduled by the first sideline control information; or the second information further includes second sideline control information associated with the first sideline data.

[0441] In some implementations, the first information is transmitted through a first resource pool and the second information is transmitted through a second resource pool, wherein the first resource pool is used to transmit PSCCH and the second resource pool is used to transmit PSSCH; or the first resource pool is used to transmit sidelink control information and the second resource pool is used to transmit sidelink data.

[0442] In some implementations, the sidelink resource for transmitting the second information is determined based on a resource detection result, where the resource detection result includes a resource detection result of the first resource pool and / or a resource detection result of the second resource pool.

[0443] In some implementations, the transmission of the second information is associated with a second timer for SL DRX, the second timer is associated with the first carrier, and / or the second timer is associated with the second carrier.

[0444] In some implementations, the second timer is used to determine an inactive time of the second terminal device, or the second timer is used to determine a round-trip time for transmitting the first information.

[0445] In some implementations, if the first terminal device sends the second information, the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmitted data of the first sideline data.

[0446] In some implementations, the first sidelink data is initially transmitted data, or the first sidelink data is retransmitted data.

[0447] In an optional embodiment, the communication unit 1110 may be a transceiver 1330. The terminal device 1100 may further include a processor 1310 and a memory 1320, as specifically shown in FIG13 .

[0448] In an optional embodiment, the communication unit 1210 may be a transceiver 1330. The terminal device 1200 may further include a processor 1310 and a memory 1320, as specifically shown in FIG13 .

[0449] Figure 13 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 13 indicate that the unit or module is optional. Apparatus 1300 may be used to implement the method described in the above method embodiment. Apparatus 1300 may be a chip, a terminal device, or a network device.

[0450] The device 1300 may include one or more processors 1310. The processor 1310 may support the device 1300 to implement the method described in the above method embodiment. The processor 1310 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0451] The apparatus 1300 may further include one or more memories 1320. The memories 1320 store programs that can be executed by the processor 1310, causing the processor 1310 to perform the methods described in the above method embodiments. The memories 1320 may be independent of the processor 1310 or integrated into the processor 1310.

[0452] The apparatus 1300 may further include a transceiver 1330. The processor 1310 may communicate with other devices or chips via the transceiver 1330. For example, the processor 1310 may transmit and receive data with other devices or chips via the transceiver 1330.

[0453] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0454] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0455] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0456] It should be understood that the terms "system" and "network" in this application can be used interchangeably. 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" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0457] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0458] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0459] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0460] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0461] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0462] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0463] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0464] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0465] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0466] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0467] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part 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, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. 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 via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. 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 or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0468] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A side communication method, characterized in that: include: The first terminal device sends first information to the second terminal device through the first carrier; The first terminal device receives or sends second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

2. The method according to claim 1, characterized in that The second carrier is determined based on third information, and the third information includes one or more of the following: information on target service type, information on target service, information on target application type, information on target application, layer 2 information, sending configuration information, information on target QoS flow, and information on data transmission type.

3. The method according to claim 2, characterized in that The second carrier is determined based on a first association relationship between the second carrier and the third information.

4. The method according to claim 3, characterized in that The second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, wherein the first carrier set includes one or more carriers that can be used to transmit the second information.

5. The method according to claim 3 or 4, characterized in that The first association relationship is applied to the NAS layer.

6. The method according to claim 1, characterized in that The time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, wherein the second resource pool and / or the second carrier are determined based on fourth information, and the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool used to transmit the first information, information about the target wireless bearer, target data priority, the congestion level of the first resource pool, and predefined information.

7. The method according to claim 6, characterized in that The second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information.

8. The method according to claim 7, characterized in that The second association relationship includes an association relationship between the second resource pool and a second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

9. The method according to claim 7 or 8, characterized in that The second association relationship is applied to the AS layer.

10. The method according to claim 1, characterized in that The second carrier is determined based on one or more of the following fifth information, and the fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool, wherein the first resource pool is used to transmit the first information and the second resource pool is used to transmit the second information.

11. The method according to claim 10, characterized in that The second carrier belongs to a third carrier set, where the third carrier set is determined based on the fifth information, wherein the third carrier set includes one or more carriers that can be used to transmit the second information.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: The first terminal device sends first indication information to the second terminal device, where the first indication information is used to indicate the second carrier.

13. The method according to claim 12, characterized in that The first indication information includes one or more of the following: indication information of the second carrier; indication information of a second resource pool used for transmitting the second information; indication information of a time domain resource used to transmit the second information; Indication information of frequency domain resources used to transmit the second information.

14. The method according to any one of claims 1 to 13, characterized in that The first carrier and / or the second carrier are determined based on a negotiation between the first terminal device and the second terminal device.

15. The method according to any one of claims 1 to 14, characterized in that The method further comprises: The first terminal device sends capability information of the first terminal device to the second terminal device, where the capability information of the first terminal device is used to indicate carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device; and / or The first terminal device receives capability information of the second terminal device sent by the second terminal device, where the capability information of the second terminal device is used to indicate carriers supported by the second terminal device and / or the number of carriers supported by the second terminal device.

16. The method according to any one of claims 1 to 15, characterized in that The method further comprises: The first terminal device sends first configuration information to the second terminal device, where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device; and / or The first terminal device receives second configuration information sent by the second terminal device, where the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

17. The method according to claim 16, characterized in that The first configuration information and / or the second configuration information is used to configure a fourth carrier set, wherein the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information.

18. The method according to claim 17, characterized in that The carrier in the fourth carrier set used to transmit the first information and / or the second information is determined based on second indication information, and the second indication information is indicated by the first terminal device and / or the second terminal device.

19. The method according to any one of claims 1 to 18, characterized in that The method further comprises: The first terminal device receives or sends third indication information, where the third indication information is used to indicate whether the second information is allowed to be transmitted through the second carrier.

20. The method according to any one of claims 1 to 19, characterized in that Whether the second information is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier available for transmitting the second information; QoS parameters associated with the first information; The communication quality between the first terminal device and the second terminal device; resource congestion status of resources available for transmitting the second information.

21. The method according to any one of claims 1 to 20, characterized in that If the first terminal device receives the second information, the first information includes side data, and the second information includes feedback information for the side data; and / or The first information is carried on a first PSSCH, and the second information is carried on a first PSFCH associated with the first PSSCH.

22. The method according to claim 21, characterized in that The second carrier is one of a plurality of carriers, the second information is one of a plurality of second information, and the plurality of second information are respectively transmitted through the plurality of carriers.

23. The method of claim 22, wherein: A radio link failure RLF of a radio link used to transmit the first information is determined based on information of unsuccessful reception in a target carrier, where the target carrier is one of the multiple carriers, or The target carrier includes the multiple carriers.

24. The method according to any one of claims 21 to 23, characterized in that A first timer for SL DRX associated with the transmission of the first information and / or the second information, wherein the start of the first timer is determined based on one or more of the following: PSFCH resources on the first carrier; a PSFCH resource with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, and the multiple carriers include the second carrier; A PSFCH resource on a carrier with the highest priority among the multiple carriers; A PSFCH resource on a primary carrier among the multiple carriers.

25. The method of claim 24, wherein: The first timer is used to determine a round trip time for transmitting the first information, or the first timer is used to determine a retransmission time of the first information.

26. The method according to any one of claims 1 to 20, characterized in that If the first terminal device sends the second information, the second information includes first sideline data, and the first information includes first sideline control information for scheduling the first sideline data; and / or The second information is carried on a second PSSCH, and the first information is carried on a first PSCCH used for scheduling the second PSSCH.

27. The method of claim 26, wherein: The first information also includes second sideline data scheduled by the first sideline control information; or The second information further includes second sideline control information associated with the first sideline data.

28. The method according to claim 26 or 27, characterized in that The first information is transmitted via a first resource pool, and the second information is transmitted via a second resource pool, The first resource pool is used to transmit PSCCH, and the second resource pool is used to transmit PSSCH; or the first resource pool is used to transmit sidelink control information, and the second resource pool is used to transmit sidelink data.

29. The method of claim 28, wherein: The sidelink resource for transmitting the second information is determined based on a resource detection result, where the resource detection result includes a resource detection result of the first resource pool and / or a resource detection result of the second resource pool.

30. The method according to any one of claims 26 to 29, characterized in that The transmission of the second information is associated with a second timer for SL DRX, the second timer is associated with the first carrier, and / or the second timer is associated with the second carrier.

31. The method of claim 30, wherein: The second timer is used to determine the inactive time of the second terminal device, or the second timer is used to determine the round trip time for transmitting the first information.

32. The method according to any one of claims 1 to 20, characterized in that If the first terminal device sends the second information, the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmission data of the first sideline data.

33. The method of claim 32, wherein: The first sidelink data is initially transmitted data, or the first sidelink data is retransmitted data.

34. A method of sideline communication, characterized in that: include: The second terminal device receives the first information sent by the first terminal device through the first carrier; The second terminal device receives or sends second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

35. The method of claim 34, wherein: The second carrier is determined based on third information, and the third information includes one or more of the following: information on target service type, information on target service, information on target application type, information on target application, layer 2 information, sending configuration information, information on target QoS flow, and information on data transmission type.

36. The method of claim 35, wherein: The second carrier is determined based on a first association relationship between the second carrier and the third information.

37. The method of claim 36, wherein: The second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, wherein the first carrier set includes one or more carriers that can be used to transmit the second information.

38. The method according to claim 35 or 36, characterized in that The first association relationship is applied to the NAS layer.

39. The method of claim 34, wherein: The time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, wherein the second resource pool and / or the second carrier are determined based on fourth information, and the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool used to transmit the first information, information about the target wireless bearer, target data priority, the congestion level of the first resource pool, and predefined information.

40. The method of claim 39, wherein: The second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information.

41. The method of claim 40, wherein: The second association relationship includes an association relationship between the second resource pool and a second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

42. The method according to claim 40 or 41, characterized in that The second association relationship is applied to the AS layer.

43. The method of claim 34, wherein: The second carrier is determined based on one or more of the following fifth information, and the fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool, wherein the first resource pool is used to transmit the first information and the second resource pool is used to transmit the second information.

44. The method of claim 43, wherein: The second carrier belongs to a third carrier set, where the third carrier set is determined based on the fifth information, wherein the third carrier set includes one or more carriers that can be used to transmit the second information.

45. The method according to any one of claims 34 to 44, characterized in that The method further comprises: The second terminal device receives first indication information sent by the first terminal device, where the first indication information is used to indicate the second carrier.

46. ​​The method of claim 45, wherein: The first indication information includes one or more of the following: indication information of the second carrier; indication information of a second resource pool used for transmitting the second information; indication information of a time domain resource used to transmit the second information; Indication information of frequency domain resources used to transmit the second information.

47. The method according to any one of claims 34 to 46, characterized in that The first carrier and / or the second carrier are determined based on a negotiation between the first terminal device and the second terminal device.

48. The method according to any one of claims 34 to 47, characterized in that The method further comprises: The second terminal device receives capability information of the first terminal device sent by the first terminal device, where the capability information of the first terminal device is used to indicate carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device; and / or The second terminal device sends capability information of the second terminal device to the first terminal device, where the capability information of the second terminal device is used to indicate carriers supported by the second terminal device and / or the number of carriers supported by the second terminal device.

49. The method according to any one of claims 34 to 48, characterized in that The method further comprises: The second terminal device receives first configuration information sent by the first terminal device, where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device; and / or The second terminal device sends second configuration information to the first terminal device, where the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

50. The method of claim 49, wherein: The first configuration information and / or the second configuration information is used to configure a fourth carrier set, wherein the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information.

51. The method of claim 50, wherein: The carrier in the fourth carrier set used to transmit the first information and / or the second information is determined based on second indication information, and the second indication information is indicated by the first terminal device and / or the second terminal device.

52. The method according to any one of claims 34 to 51, characterized in that The method further comprises: The second terminal device receives or sends third indication information, where the third indication information is used to indicate whether the second information is allowed to be transmitted through the second carrier.

53. The method according to any one of claims 34 to 52, characterized in that Whether the second information is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier available for transmitting the second information; QoS parameters associated with the first information; The communication quality between the first terminal device and the second terminal device; resource congestion status of resources available for transmitting the second information.

54. The method according to any one of claims 34 to 53, characterized in that If the first terminal device receives the second information, the first information includes side data, and the second information includes feedback information for the side data; and / or The first information is carried on a first PSSCH, and the second information is carried on a first PSFCH associated with the first PSSCH.

55. The method of claim 54, wherein: The second carrier is one of a plurality of carriers, the second information is one of a plurality of second information, and the plurality of second information are respectively transmitted through the plurality of carriers.

56. The method of claim 55, wherein: A radio link failure RLF of a radio link used to transmit the first information is determined based on information of unsuccessful reception in a target carrier, where the target carrier is one of the multiple carriers, or The target carrier includes the multiple carriers.

57. The method according to any one of claims 54 to 56, characterized in that A first timer for SL DRX associated with the transmission of the first information and / or the second information, wherein the start of the first timer is determined based on one or more of the following: PSFCH resources on the first carrier; a PSFCH resource with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, and the multiple carriers include the second carrier; A PSFCH resource on a carrier with the highest priority among the multiple carriers; A PSFCH resource on a primary carrier among the multiple carriers.

58. The method of claim 57, wherein: The first timer is used to determine a round trip time for transmitting the first information, or the first timer is used to determine a retransmission time of the first information.

59. The method according to any one of claims 34 to 53, characterized in that If the first terminal device sends the second information, the second information includes first sideline data, and the first information includes first sideline control information for scheduling the first sideline data; and / or The second information is carried on a second PSSCH, and the first information is carried on a first PSCCH used for scheduling the second PSSCH.

60. The method of claim 59, wherein: The first information also includes second sideline data scheduled by the first sideline control information; or The second information further includes second sideline control information associated with the first sideline data.

61. The method of claim 59 or 60, wherein: The first information is transmitted via a first resource pool, and the second information is transmitted via a second resource pool, The first resource pool is used to transmit PSCCH, and the second resource pool is used to transmit PSSCH; or the first resource pool is used to transmit sidelink control information, and the second resource pool is used to transmit sidelink data.

62. The method of claim 61, wherein: The sidelink resource for transmitting the second information is determined based on a resource detection result, where the resource detection result includes a resource detection result of the first resource pool and / or a resource detection result of the second resource pool.

63. The method according to any one of claims 59 to 62, characterized in that The transmission of the second information is associated with a second timer for SL DRX, the second timer is associated with the first carrier, and / or the second timer is associated with the second carrier.

64. The method of claim 63, wherein: The second timer is used to determine the inactive time of the second terminal device, or the second timer is used to determine the round trip time for transmitting the first information.

65. The method of any one of claims 34 to 53, wherein: If the first terminal device sends the second information, the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmission data of the first sideline data.

66. The method of claim 65, wherein: The first sidelink data is initially transmitted data, or the first sidelink data is retransmitted data.

67. A terminal device, characterized in that: The terminal device is a first terminal device, comprising: A communication unit, configured to send first information to a second terminal device via a first carrier; The communication unit is configured to receive or send second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

68. The terminal device according to claim 67, characterized in that: The second carrier is determined based on third information, and the third information includes one or more of the following: information on target service type, information on target service, information on target application type, information on target application, layer 2 information, sending configuration information, information on target QoS flow, and information on data transmission type.

69. The terminal device according to claim 68, characterized in that The second carrier is determined based on a first association relationship between the second carrier and the third information.

70. The terminal device according to claim 69, characterized in that: The second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, wherein the first carrier set includes one or more carriers that can be used to transmit the second information.

71. The terminal device according to claim 68 or 69, characterized in that: The first association relationship is applied to the NAS layer.

72. The terminal device according to claim 67, characterized in that: The time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, wherein the second resource pool and / or the second carrier are determined based on fourth information, and the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool used to transmit the first information, information about the target wireless bearer, target data priority, the congestion level of the first resource pool, and predefined information.

73. The terminal device according to claim 72, characterized in that: The second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information.

74. The terminal device according to claim 73, characterized in that: The second association relationship includes an association relationship between the second resource pool and a second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

75. The terminal device according to claim 73 or 74, characterized in that: The second association relationship is applied to the AS layer.

76. The terminal device according to claim 67, characterized in that: The second carrier is determined based on one or more of the following fifth information, and the fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool, wherein the first resource pool is used to transmit the first information and the second resource pool is used to transmit the second information.

77. The terminal device according to claim 76, characterized in that: The second carrier belongs to a third carrier set, where the third carrier set is determined based on the fifth information, wherein the third carrier set includes one or more carriers that can be used to transmit the second information.

78. The terminal device according to any one of claims 67 to 77, characterized in that: The sending unit is also used for: Send first indication information to the second terminal device, where the first indication information is used to indicate the second carrier.

79. The terminal device according to claim 78, characterized in that The first indication information includes one or more of the following: indication information of the second carrier; indication information of a second resource pool used for transmitting the second information; indication information of a time domain resource used to transmit the second information; Indication information of frequency domain resources used to transmit the second information.

80. The terminal device according to any one of claims 67 to 79, characterized in that: The first carrier and / or the second carrier are determined based on a negotiation between the first terminal device and the second terminal device.

81. The terminal device according to any one of claims 67 to 80, characterized in that: The sending unit is used to send the capability information of the first terminal device to the second terminal device, where the capability information of the first terminal device is used to indicate the carrier supported by the first terminal device and / or the number of carriers supported by the first terminal device; and / or The receiving unit is used to receive capability information of the second terminal device sent by the second terminal device, where the capability information of the second terminal device is used to indicate carriers supported by the second terminal device and / or the number of carriers supported by the second terminal device.

82. The terminal device according to any one of claims 67 to 81, characterized in that: The sending unit is used to send first configuration information to the second terminal device, where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device; and / or The receiving unit is used to receive second configuration information sent by the second terminal device, where the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

83. The terminal device as claimed in claim 82, characterized in that: The first configuration information and / or the second configuration information is used to configure a fourth carrier set, wherein the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information.

84. The terminal device as claimed in claim 83, characterized in that: The carrier in the fourth carrier set used to transmit the first information and / or the second information is determined based on second indication information, and the second indication information is indicated by the first terminal device and / or the second terminal device.

85. The terminal device according to any one of claims 67 to 84, characterized in that: The sending unit is used to receive the third indication information, or the receiving unit is used to receive or send the third indication information, wherein the third indication information is used to indicate whether the second information is allowed to be transmitted through the second carrier.

86. The terminal device according to any one of claims 67 to 85, characterized in that: Whether the second information is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier available for transmitting the second information; QoS parameters associated with the first information; The communication quality between the first terminal device and the second terminal device; resource congestion status of resources available for transmitting the second information.

87. The terminal device according to any one of claims 67 to 86, characterized in that: If the first terminal device receives the second information, the first information includes side data, and the second information includes feedback information for the side data; and / or The first information is carried on a first PSSCH, and the second information is carried on a first PSFCH associated with the first PSSCH.

88. The terminal device as claimed in claim 87, characterized in that: The second carrier is one of a plurality of carriers, the second information is one of a plurality of second information, and the plurality of second information are respectively transmitted through the plurality of carriers.

89. The terminal device as claimed in claim 88, characterized in that: A radio link failure RLF of a radio link used to transmit the first information is determined based on information of unsuccessful reception in a target carrier, where the target carrier is one of the multiple carriers, or The target carrier includes the multiple carriers.

90. The terminal device according to any one of claims 87 to 89, characterized in that: A first timer for SL DRX associated with the transmission of the first information and / or the second information, wherein the start of the first timer is determined based on one or more of the following: PSFCH resources on the first carrier; a PSFCH resource with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, and the multiple carriers include the second carrier; A PSFCH resource on a carrier with the highest priority among the multiple carriers; A PSFCH resource on a primary carrier among the multiple carriers.

91. The terminal device according to claim 90, characterized in that: The first timer is used to determine a round trip time for transmitting the first information, or the first timer is used to determine a retransmission time of the first information.

92. The terminal device according to any one of claims 67 to 86, characterized in that: If the first terminal device sends the second information, the second information includes first sideline data, and the first information includes first sideline control information for scheduling the first sideline data; and / or The second information is carried on a second PSSCH, and the first information is carried on a first PSCCH used for scheduling the second PSSCH.

93. The terminal device as claimed in claim 92, characterized in that: The first information also includes second sideline data scheduled by the first sideline control information; or The second information further includes second sideline control information associated with the first sideline data.

94. The terminal device according to claim 92 or 93, characterized in that: The first information is transmitted via a first resource pool, and the second information is transmitted via a second resource pool, The first resource pool is used to transmit PSCCH, and the second resource pool is used to transmit PSSCH; or the first resource pool is used to transmit sidelink control information, and the second resource pool is used to transmit sidelink data.

95. The terminal device according to claim 94, characterized in that: The sidelink resource for transmitting the second information is determined based on a resource detection result, where the resource detection result includes a resource detection result of the first resource pool and / or a resource detection result of the second resource pool.

96. The terminal device according to any one of claims 92 to 95, characterized in that: The transmission of the second information is associated with a second timer for SL DRX, the second timer is associated with the first carrier, and / or the second timer is associated with the second carrier.

97. The terminal device according to claim 96, characterized in that: The second timer is used to determine the inactive time of the second terminal device, or the second timer is used to determine the round trip time for transmitting the first information.

98. The terminal device according to any one of claims 67 to 86, characterized in that: If the first terminal device sends the second information, the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmission data of the first sideline data.

99. The terminal device according to claim 98, characterized in that: The first sidelink data is initially transmitted data, or the first sidelink data is retransmitted data.

100. A terminal device, characterized in that: The terminal device is a second terminal device, comprising: A communication unit, configured to receive first information sent by a first terminal device through a first carrier; The communication unit is configured to receive or send second information via a second carrier, wherein the first carrier is different from the second carrier, and the second information is associated with the first information.

101. The terminal device according to claim 100, characterized in that: The second carrier is determined based on third information, and the third information includes one or more of the following: information on target service type, information on target service, information on target application type, information on target application, layer 2 information, sending configuration information, information on target QoS flow, and information on data transmission type.

102. The terminal device as claimed in claim 101, characterized in that: The second carrier is determined based on a first association relationship between the second carrier and the third information.

103. The terminal device as claimed in claim 102, characterized in that: The second carrier belongs to a first carrier set, and the first association relationship includes an association relationship between the first carrier set and the third information, wherein the first carrier set includes one or more carriers that can be used to transmit the second information.

104. The terminal device according to claim 101 or 102, characterized in that: The first association relationship is applied to the NAS layer.

105. The terminal device as claimed in claim 100, characterized in that: The time-frequency resources for transmitting the second information belong to a second resource pool corresponding to the second carrier, wherein the second resource pool and / or the second carrier are determined based on fourth information, and the fourth information includes one or more of the following: information about the first carrier, information about the target QoS flow, information about the logical channel, information about the first resource pool used to transmit the first information, information about the target wireless bearer, target data priority, the congestion level of the first resource pool, and predefined information.

106. The terminal device as claimed in claim 105, characterized in that: The second resource pool is determined based on a second association relationship, wherein the second association relationship includes an association relationship between the second resource pool and the second carrier, and an association relationship between the second carrier and the fourth information.

107. The terminal device according to claim 106, characterized in that: The second association relationship includes an association relationship between the second resource pool and a second carrier set, and an association relationship between the second carrier set and the fourth information, wherein the second carrier set includes one or more carriers that can be used to transmit the second information.

108. The terminal device according to claim 105 or 106, characterized in that: The second association relationship is applied to the AS layer.

109. The terminal device as claimed in claim 100, characterized in that: The second carrier is determined based on one or more of the following fifth information, and the fifth information includes one or more of the following: layer 2 information, frequency domain resources of the first information, configuration information of the first resource pool, and configuration information of the second resource pool, wherein the first resource pool is used to transmit the first information and the second resource pool is used to transmit the second information.

110. The terminal device according to claim 109, characterized in that: The second carrier belongs to a third carrier set, where the third carrier set is determined based on the fifth information, wherein the third carrier set includes one or more carriers that can be used to transmit the second information.

111. The terminal device according to any one of claims 100-110, characterized in that: The receiving unit is further used to receive first indication information sent by the first terminal device, where the first indication information is used to indicate the second carrier.

112. The terminal device as claimed in claim 111, characterized in that: The first indication information includes one or more of the following: indication information of the second carrier; indication information of a second resource pool used for transmitting the second information; indication information of a time domain resource used to transmit the second information; Indication information of frequency domain resources used to transmit the second information.

113. The terminal device according to any one of claims 100-112, characterized in that: The first carrier and / or the second carrier are determined based on a negotiation between the first terminal device and the second terminal device.

114. The terminal device according to any one of claims 100-113, characterized in that: The receiving unit is further used to receive capability information of the first terminal device sent by the first terminal device, where the capability information of the first terminal device is used to indicate carriers supported by the first terminal device and / or the number of carriers supported by the first terminal device; and / or The sending unit is further used to send capability information of the second terminal device to the first terminal device, where the capability information of the second terminal device is used to indicate carriers supported by the second terminal device and / or the number of carriers supported by the second terminal device.

115. The terminal device according to any one of claims 100-114, characterized in that: The receiving unit is further used to receive first configuration information sent by the first terminal device, where the first configuration information is used to configure the first carrier and / or the second carrier for the second terminal device; and / or The sending unit is further used to send second configuration information to the first terminal device, where the second configuration information is used to configure the first carrier and / or the second carrier for the first terminal device.

116. The terminal device as claimed in claim 115, characterized in that: The first configuration information and / or the second configuration information is used to configure a fourth carrier set, wherein the fourth carrier set includes one or more carriers that can be used to transmit the first information and / or the second information.

117. The terminal device as claimed in claim 116, characterized in that: The carrier in the fourth carrier set used to transmit the first information and / or the second information is determined based on second indication information, and the second indication information is indicated by the first terminal device and / or the second terminal device.

118. The terminal device according to any one of claims 100-117, characterized in that: The sending unit is used to send third indication information, or the receiving unit is used to receive the third indication information, wherein the third indication information is used to indicate whether the second information is allowed to be transmitted through the second carrier.

119. The terminal device according to any one of claims 100-118, characterized in that: Whether the second information is transmitted through the second carrier is determined based on one or more of the following: whether there is a carrier available for transmitting the second information; QoS parameters associated with the first information; The communication quality between the first terminal device and the second terminal device; resource congestion status of resources available for transmitting the second information.

120. The terminal device according to any one of claims 100-119, characterized in that: If the first terminal device receives the second information, the first information includes side data, and the second information includes feedback information for the side data; and / or The first information is carried on a first PSSCH, and the second information is carried on a first PSFCH associated with the first PSSCH.

121. The terminal device as claimed in claim 120, characterized in that: The second carrier is one of a plurality of carriers, the second information is one of a plurality of second information, and the plurality of second information are respectively transmitted through the plurality of carriers.

122. The terminal device as claimed in claim 121, characterized in that: A radio link failure RLF of a radio link used to transmit the first information is determined based on information of unsuccessful reception in a target carrier, where the target carrier is one of the multiple carriers, or The target carrier includes the multiple carriers.

123. The terminal device according to any one of claims 120-122, characterized in that: A first timer for SL DRX associated with the transmission of the first information and / or the second information, wherein the start of the first timer is determined based on one or more of the following: PSFCH resources on the first carrier; a PSFCH resource with the latest time domain position among multiple carriers, wherein the multiple carriers are carriers for transmitting the second information, and the multiple carriers include the second carrier; A PSFCH resource on a carrier with the highest priority among the multiple carriers; A PSFCH resource on a primary carrier among the multiple carriers.

124. The terminal device as claimed in claim 123, characterized in that: The first timer is used to determine a round trip time for transmitting the first information, or the first timer is used to determine a retransmission time of the first information.

125. The terminal device according to any one of claims 100-124, characterized in that: If the first terminal device sends the second information, the second information includes first sideline data, and the first information includes first sideline control information for scheduling the first sideline data; and / or The second information is carried on a second PSSCH, and the first information is carried on a first PSCCH used for scheduling the second PSSCH.

126. The terminal device as claimed in claim 125, characterized in that: The first information also includes second sideline data scheduled by the first sideline control information; or The second information further includes second sideline control information associated with the first sideline data.

127. The terminal device according to claim 125 or 126, characterized in that: The first information is transmitted via a first resource pool, and the second information is transmitted via a second resource pool, The first resource pool is used to transmit PSCCH, and the second resource pool is used to transmit PSSCH; or the first resource pool is used to transmit sidelink control information, and the second resource pool is used to transmit sidelink data.

128. The terminal device as claimed in claim 127, characterized in that: The sidelink resource for transmitting the second information is determined based on a resource detection result, where the resource detection result includes a resource detection result of the first resource pool and / or a resource detection result of the second resource pool.

129. The terminal device according to any one of claims 125-128, characterized in that: The transmission of the second information is associated with a second timer for SL DRX, the second timer is associated with the first carrier, and / or the second timer is associated with the second carrier.

130. The terminal device as claimed in claim 129, characterized in that: The second timer is used to determine the inactive time of the second terminal device, or the second timer is used to determine the round trip time for transmitting the first information.

131. The terminal device according to any one of claims 100-119, characterized in that: If the first terminal device sends the second information, the first information includes first sideline data, and the second information includes second sideline data, wherein the second sideline data is retransmission data of the first sideline data.

132. The terminal device as claimed in claim 131, characterized in that: The first sidelink data is initially transmitted data, or the first sidelink data is retransmitted data.

133. A terminal device, characterized in that: It includes a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal device executes the method as described in any one of claims 1-66.

134. A device, characterized in that: It comprises a processor for calling a program from a memory so that the apparatus executes a method as described in any one of claims 1-66.

135. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory so that a device equipped with the chip executes a method as described in any one of claims 1 to 66.

136. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 66.

137. A computer program product, characterized in that It comprises a program which causes a computer to execute the method as claimed in any one of claims 1 to 66.

138. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1-66.

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