Method and device for detecting radio link failure of sidelink

Abstract

The embodiment of the invention discloses a wireless link failure detection method and device for a sidelink, which can be applied to systems such as Internet of Vehicles, V2X, V2V and the like, and the method comprises the following steps: terminal equipment determines a receiving condition of hybrid automatic repeat request (HARQ) feedback on a physical sidelink feedback channel (PSFCH); according to the receiving condition fed back by the HARQ on the PSFCH, determining whether the unicast connection triggers a sidelink (SL) radio link failure (RLF); wherein the unicast connection is the unicast connection established by the sending terminal and the receiving terminal on the sidelink, the sending terminal and the receiving terminal perform sidelink communication through a plurality of carriers, and the plurality of carriers are associated with the unicast connection. By implementing the embodiment of the invention, the problem of how to effectively detect the RLF in a sidelink carrier aggregation scene can be solved, so that an RLF mechanism can be supported in the carrier aggregation scene of sidelink communication.

Description

Sidelink wireless link failure detection method and device Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a method and device for detecting wireless link failure of a sidelink. Background Art

[0002] To support direct communication between terminals, direct communication (also called sidelink, SL) was introduced. The interface between terminals is PC-5. Depending on the correspondence between the sending and receiving terminals, three transmission modes are supported on the sidelink: unicast, multicast, and broadcast.

[0003] For version R18 Sidelink, it supports carrier aggregation technology, that is, sidelink carrier aggregation can be used to achieve terminal-to-terminal communication. This scenario can be called a sidelink carrier aggregation scenario.

[0004] However, there is currently a lack of effective means for detecting radio link failure in sidelink carrier aggregation scenarios.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a sidelink radio link failure detection method and apparatus thereof, which can be applied to the Internet of Vehicles, such as vehicle to everything (V2X) communication, long-term evolution-vehicle (LTE-V) communication, vehicle to vehicle (V2V) communication, etc., or can be used in the fields of intelligent driving, intelligent connected vehicles, etc., and can solve the problem of how to effectively detect radio link failure (RLF) in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0007] In a first aspect, an embodiment of the present disclosure provides a method for detecting a radio link failure of a sidelink, the method being performed by a transmitting terminal, the method comprising:

[0008] Determining the reception of hybrid automatic repeat request (HARQ) feedback on the physical sidelink feedback channel (PSFCH);

[0009] Determining whether a unicast connection triggers a sidelink SL radio link failure RLF based on a reception condition of the HARQ feedback on the PSFCH;

[0010] The unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0011] In this technical solution, the problem of how to effectively detect RLF in a sidelink carrier aggregation scenario can be solved, so that the RLF mechanism can be supported in a carrier aggregation scenario of sidelink communication.

[0012] In a second aspect, an embodiment of the present disclosure provides another method for detecting radio link failure of a sidelink, the method being performed by a network device, the method comprising:

[0013] Sending first configuration information to a sending terminal; wherein,

[0014] The first configuration information includes a first threshold value associated with a first variable, the transmitting terminal maintains one first variable for each unicast connection, the unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, the first variable is used to count the number of consecutive discontinuous transmissions (DTX) of the unicast connection on the multiple carriers, and the multiple carriers are associated with the unicast connection; wherein,

[0015] The first variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink (SL) radio link failure (RLF).

[0016] In this technical solution, the sending terminal maintains a first variable for each unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on multiple carriers. In this way, the first threshold of the first variable is configured for the sending terminal through the network device, so that the sending terminal can determine whether the unicast connection triggers SLRLF through the first threshold. This can solve the problem of how to effectively detect RLF in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0017] In a third aspect, an embodiment of the present disclosure provides another method for detecting radio link failure of a sidelink, the method being performed by a network device, the method comprising:

[0018] Sending second configuration information to the sending terminal; wherein,

[0019] The transmitting terminal and the receiving terminal establish a unicast connection on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, and the multiple carriers are associated with the unicast connection;

[0020] The second configuration information includes a second threshold associated with a second variable, and the transmitting terminal independently maintains a second variable for each of the carriers, and the second variable is used to count the number of continuous and discontinuous transmissions DTX of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the transmitting terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

[0021] In this technical solution, the transmitting terminal independently maintains a second variable for each carrier, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable. In this way, the second threshold of the second variable is configured for the transmitting terminal through the network device, so that the transmitting terminal can determine whether the unicast connection triggers SLRLF through the second threshold. This can solve the problem of how to effectively detect RLF in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0022] In a fourth aspect, an embodiment of the present disclosure provides a sidelink radio link failure detection device, the device having the ability to implement some or all of the functions of the transmitting terminal in the method described in the first aspect above. For example, the functions of the device may have the functions of some or all of the embodiments of the present disclosure, or may have the functions of implementing any one of the embodiments of the present disclosure alone. The functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0023] In one implementation, the structure of the apparatus may include a transceiver module and a processing module, wherein the processing module is configured to support the apparatus in performing the corresponding functions of the above-mentioned method. The transceiver module is used to support communication between the apparatus and other devices. The apparatus may also include a storage module, which is coupled to the transceiver module and the processing module and stores computer programs and data necessary for the apparatus.

[0024] In one implementation, the processing module is used to determine the reception status of the hybrid automatic repeat request HARQ feedback on the physical sidelink feedback channel PSFCH; the processing module is also used to determine whether the unicast connection triggers the sidelink SL radio link failure RLF based on the reception status of the HARQ feedback on the PSFCH; wherein the unicast connection is a unicast connection established between the device and the receiving terminal on the sidelink, and the device and the receiving terminal perform sidelink communication through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0025] As an example, the processing module may be a processor, the transceiver module may be a transceiver or a communication interface, and the storage module may be a memory.

[0026] In a fifth aspect, an embodiment of the present disclosure provides another sidelink radio link failure detection device, which has the function of implementing some or all of the network devices in the method example described in the second aspect above. For example, the functions of the communication device may have the functions of some or all of the embodiments of the present disclosure, or may have the function of implementing any one of the embodiments of the present disclosure alone. The functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0027] In one implementation, the device may include a transceiver module and a processing module, the processing module being configured to support the communication device in performing the corresponding functions of the above-described method. The transceiver module is configured to support communication between the communication device and other devices. The device may also include a storage module, coupled to the transceiver module and the processing module, which stores computer programs and data necessary for the communication device.

[0028] In one implementation, the transceiver module is used to send first configuration information to the sending terminal; wherein, the first configuration information includes a first threshold value associated with a first variable, and the sending terminal maintains one first variable for each unicast connection, and the unicast connection is a unicast connection established by the sending terminal and the receiving terminal on the side link, and the sending terminal and the receiving terminal perform side link communication through multiple carriers, and the multiple carriers are associated with the unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein, the first variable is used by the sending terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

[0029] In a sixth aspect, an embodiment of the present disclosure provides another sidelink radio link failure detection device, which has the function of implementing some or all of the network devices in the method example described in the third aspect above. For example, the functions of the communication device may have the functions of some or all of the embodiments of the present disclosure, or may have the function of implementing any one of the embodiments of the present disclosure alone. The functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0030] In one implementation, the device may include a transceiver module and a processing module, the processing module being configured to support the communication device in performing the corresponding functions of the above-described method. The transceiver module is configured to support communication between the communication device and other devices. The device may also include a storage module, coupled to the transceiver module and the processing module, which stores computer programs and data necessary for the communication device.

[0031] In one implementation, the transceiver module is used to send second configuration information to the sending terminal; wherein, the sending terminal and the receiving terminal establish a unicast connection on the side link, and the sending terminal and the receiving terminal perform side link communication through multiple carriers, and the multiple carriers are associated with the unicast connection; the second configuration information includes a second threshold associated with a second variable, and the sending terminal independently maintains a second variable for each of the carriers, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the sending terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

[0032] In a seventh aspect, an embodiment of the present disclosure provides a communication device, which includes a processor. When the processor calls a computer program in a memory, it executes the method described in the first aspect above.

[0033] In an eighth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor. When the processor calls a computer program in a memory, the method described in the second aspect is executed.

[0034] In a ninth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor. When the processor calls a computer program in a memory, the method described in the third aspect is executed.

[0035] In the tenth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the first aspect above.

[0036] In the eleventh aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the second aspect above.

[0037] In the twelfth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the third aspect above.

[0038] In a thirteenth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the first aspect above.

[0039] In a fourteenth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the second aspect above.

[0040] In a fifteenth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the third aspect above.

[0041] In the sixteenth aspect, an embodiment of the present disclosure provides a side link wireless link failure detection system, the system including the wireless link failure detection device described in the fourth aspect and the wireless link failure detection device described in the fifth aspect, or the system including the wireless link failure detection device described in the fourth aspect and the wireless link failure detection device described in the sixth aspect, or the system including the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the system including the communication device described in the seventh aspect and the communication device described in the ninth aspect, or the system including the communication device described in the tenth aspect and the communication device described in the eleventh aspect, or the system including the communication device described in the tenth aspect and the communication device described in the twelfth aspect, or the system including the communication device described in the thirteenth aspect and the communication device described in the fourteenth aspect, or the system including the communication device described in the thirteenth aspect and the communication device described in the fifteenth aspect.

[0042] In the seventeenth aspect, an embodiment of the present disclosure provides a computer-readable storage medium for storing instructions for the above-mentioned sending terminal, and when the instructions are executed, the sending terminal executes the method described in the first aspect.

[0043] In the eighteenth aspect, an embodiment of the present disclosure provides a readable storage medium for storing instructions used by the above-mentioned network device. When the instructions are executed, the network device executes the method described in the second aspect.

[0044] In the nineteenth aspect, an embodiment of the present disclosure provides a readable storage medium for storing instructions used by the above-mentioned network device, and when the instructions are executed, the network device executes the method described in the third aspect above.

[0045] In a twentieth aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0046] In a twenty-first aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect above.

[0047] In a twenty-second aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the third aspect above.

[0048] In a twenty-third aspect, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a transmitting terminal in implementing the functions described in the first aspect, such as determining or processing at least one of the data and information involved in the aforementioned method. In one possible design, the chip system further comprises a memory for storing computer programs and data necessary for the transmitting terminal. The chip system may consist of a single chip or may include a chip and other discrete components.

[0049] In a twenty-fourth aspect, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a network device in implementing the functions described in the second aspect, such as determining or processing at least one of the data and information described in the aforementioned method. In one possible design, the chip system further comprises a memory for storing computer programs and data necessary for the network device. The chip system may consist of a single chip or may include a chip and other discrete components.

[0050] In aspect 25, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a network device in implementing the functions described in aspect 3, such as determining or processing at least one of the data and information described in the aforementioned method. In one possible design, the chip system further comprises a memory for storing computer programs and data necessary for the network device. The chip system may consist of a single chip or may include a chip and other discrete components.

[0051] In a twenty-sixth aspect, the present disclosure provides a computer program which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0052] In aspect 27, the present disclosure provides a computer program which, when executed on a computer, enables the computer to execute the method described in aspect 2 above.

[0053] In a twenty-eighth aspect, the present disclosure provides a computer program which, when executed on a computer, enables the computer to execute the method described in the third aspect above.

[0054] In aspect 29, the present disclosure provides a communication system, including: a terminal device configured to implement the method described in aspect 1 above; and a network device configured to implement the method described in aspect 2 or aspect 3 above. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the background technology, the drawings required for use in the embodiments of the present disclosure or the background technology will be described below.

[0056] FIG1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure;

[0057] FIG2 is a flow chart of a method for detecting radio link failure of a sidelink provided by an embodiment of the present disclosure;

[0058] FIG3 is a flowchart of another sidelink radio link failure detection method provided by an embodiment of the present disclosure;

[0059] FIG4 is a flowchart of another sidelink radio link failure detection method provided by an embodiment of the present disclosure;

[0060] FIG5 is a flowchart of another sidelink radio link failure detection method provided by an embodiment of the present disclosure;

[0061] FIG6 is a flowchart of another sidelink radio link failure detection method provided by an embodiment of the present disclosure;

[0062] FIG7 is a schematic structural diagram of a communication device provided by an embodiment of the present disclosure;

[0063] FIG8 is a schematic structural diagram of another communication device provided by an embodiment of the present disclosure;

[0064] FIG9 is a schematic structural diagram of a chip provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and are not to be construed as limitations on the present disclosure. In the description of the present disclosure, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: the existence of A alone, the existence of A and B at the same time, and the existence of B alone.

[0066] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "an" and "the" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0067] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the embodiments of the present disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the embodiments of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0068] The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be understood as limiting the present disclosure.

[0069] To facilitate understanding, the terms involved in this disclosure are first introduced.

[0070] 1. Sidelink (SL)

[0071] A link for direct communication between end devices.

[0072] 2. Vehicle-to-everything (V2X) communication

[0073] V2X communication refers to the communication between a vehicle and anything in the outside world. V2X communication may include, but is not limited to, vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-infrastructure (V2I) communication, and vehicle-to-network (V2N) communication.

[0074] It should be noted that in order to support direct communication between terminal devices, a direct communication (also called sidelink, SL) communication mode is introduced, and the interface between terminal devices is PC-5. Based on the correspondence between the transmitting terminal and the receiving terminal, three transmission modes are supported on the sidelink, such as unicast, multicast, and broadcast. The transmitting terminal sends sidelink control information (SCI) on the PSCCH (Physical Sidelink Control Channel) channel and sends the second stage SCI on the PSSCH (Physical Sidelink Shared Channel), which carries the resource location of the transmitted data and the source and destination identifiers, etc. For data packets with HARQ (Hybrid Automatic Repeat reQuest) feedback enabled, the receiving terminal performs HARQ-ACK (Hybrid Automatic Retransmission Request Acknowledgement) feedback on the PSSCH (Physical Sidelink Feedback Channel) channel.

[0075] There are two ways to allocate transmission resources for Sidelink communication: one is dynamic scheduling by the network (the first allocation mode, also called mode 1), and the other is autonomous selection by the terminal from a network-configured or pre-configured resource pool (the second allocation mode, also called mode 2). Dynamic scheduling means that the network dynamically allocates transmission resources on the Sidelink to the terminal based on the terminal's cached data report, while autonomous selection means that the terminal randomly selects transmission resources from a network-configured or pre-configured resource pool. Network equipment can configure multiple resource pools for a terminal on a BWP (Band Width Part). The specific allocation method used is configured by the network device through RRC (Radio Resource Control) signaling.

[0076] Version R16 introduces a SL RLF (Sidelink Radio Link Failure) detection mechanism based on HARQ (Hybrid Automatic Repeat reQuest) feedback. For a unicast connection, if the terminal does not receive HARQ feedback on the PSFCH (Physical Sidelink Shared Channel) resource for a certain number of consecutive times, it is considered that continuous DTX (Discontinuous Transmission) has occurred. The terminal considers that SL RLF based on HARQ feedback has occurred in the unicast connection and notifies the RRC layer. RRC controls SL RLF detection based on HARQ feedback by configuring the maximum number of consecutive DTXs (sl-maxNumConsecutiveDTX) for a single terminal (per UE).

[0077] For version R18 Sidelink, it supports carrier aggregation technology, that is, sidelink carrier aggregation can be used to achieve terminal-to-terminal communication. This scenario can be called a sidelink carrier aggregation scenario.

[0078] However, there is currently a lack of effective means for detecting radio link failure in sidelink carrier aggregation scenarios.

[0079] To this end, the present disclosure proposes a sidelink wireless link failure detection method and device, which can solve the problem of how to effectively detect RLF in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0080] In order to better understand the sidelink radio link failure detection method disclosed in an embodiment of the present disclosure, the communication system to which the embodiment of the present disclosure is applicable is first described below.

[0081] Please refer to Figure 1, which is a schematic diagram of the architecture of a communication system provided in an embodiment of the present disclosure. The communication system may include, but is not limited to, a network device and a terminal. The number and configuration of devices shown in Figure 1 are for example purposes only and do not constitute a limitation on the embodiments of the present disclosure. In actual applications, two or more network devices and two or more terminals may be included. The communication system shown in Figure 1 includes, for example, a network device 101 and a terminal 102.

[0082] It should be noted that the technical solutions of the embodiments of the present disclosure can be applied to various communication systems. For example, long term evolution (LTE) systems, fifth generation (5G) mobile communication systems, 5G new radio (NR) systems, or other future new mobile communication systems. It should also be noted that the sidelink in the embodiments of the present disclosure can also be referred to as a sidelink or a through link.

[0083] The network device 101 in the embodiment of the present disclosure is an entity on the network side for transmitting or receiving signals. For example, the network device 101 can be an evolved NodeB (eNB), a transmission reception point (TRP), a next generation NodeB (gNB) in an NR system, a base station in other future mobile communication systems, or an access node in a wireless fidelity (WiFi) system. The embodiment of the present disclosure does not limit the specific technology and specific device form adopted by the network device. The network device provided in the embodiment of the present disclosure can be composed of a centralized unit (CU) and a distributed unit (DU), wherein the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the network device, such as the base station, and the functions of some protocol layers are placed in the CU for centralized control, and the functions of the remaining part or all of the protocol layers are distributed in the DU, and the DU is centrally controlled by the CU.

[0084] The terminal 102 in the embodiment of the present disclosure is an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal can also be called a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal can be a car with communication function, a smart car, a mobile phone, a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, 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. The embodiment of the present disclosure does not limit the specific technology and specific device form adopted by the terminal. The sending terminal mentioned in the embodiment of the present disclosure can refer to the terminal 102.

[0085] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0086] The sidelink wireless link failure detection method and device provided by the present disclosure are described in detail below with reference to the accompanying drawings.

[0087] Please refer to Figure 2, which is a flowchart of a sidelink radio link failure detection method provided by an embodiment of the present disclosure. It should be noted that the method is executed by the transmitting terminal. As shown in Figure 2, the method may include but is not limited to the following steps.

[0088] In step 201, the reception status of HARQ feedback on the PSFCH is determined.

[0089] In an embodiment of the present disclosure, the transmitting terminal may transmit SCI on the PSCCH channel and transmit the second-stage SCI on the PSSCH channel, wherein the second-stage SCI carries the resource location of the transmission data and the source and destination identifiers, etc. For a data packet enabled with HARQ feedback, the receiving terminal performs HARQ-ACK (Hybrid Automatic Retransmission Request Acknowledgement) feedback on the PSSCH on the PSFCH channel. Thus, the transmitting terminal may determine the reception status of the HARQ feedback on the PSFCH, so as to detect whether SLRLF has occurred in the unicast connection between the transmitting terminal and the receiving terminal based on the reception status of the HARQ feedback on the PSFCH. That is, the transmitting terminal may determine whether SLRLF has been triggered in the unicast connection between the transmitting terminal and the receiving terminal based on the reception status of the HARQ feedback on the PSFCH by the receiving terminal.

[0090] In step 202, it is determined whether the unicast connection triggers SL RLF according to the reception status of HARQ feedback on PSFCH.

[0091] In an embodiment of the present disclosure, the unicast connection is a unicast connection established between a transmitting terminal and a receiving terminal on a sidelink, and the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0092] In an embodiment of the present disclosure, a transmitting terminal may determine whether a unicast connection between the transmitting terminal and the receiving terminal has triggered an SL RLF based on the reception status of HARQ feedback on the PSFCH. That is, the transmitting terminal may detect whether an SL RLF based on HARQ feedback has occurred in the unicast connection between the transmitting terminal and the receiving terminal based on the reception status of HARQ feedback on the PSFCH. If an SL RLF based on HARQ feedback is detected in the unicast connection, it may be determined that the unicast connection has triggered an SL RLF. If an SL RLF based on HARQ feedback is not detected in the unicast connection, it may be determined that the unicast connection has not triggered an SL RLF.

[0093] Optionally, in one implementation, if the transmitting terminal fails to receive HARQ feedback on the PSFCH resource for a certain number of consecutive times (discontinuous transmission, DTX), it is determined that the unicast connection between the transmitting terminal and the receiving terminal has triggered SL RLF. Alternatively, if the transmitting terminal fails to receive HARQ feedback on the PSFCH resource for a number of times less than the certain number, it is determined that the unicast connection between the transmitting terminal and the receiving terminal has not triggered SL RLF.

[0094] In one possible implementation, if a transmitting terminal determines that a unicast connection between the transmitting terminal and a receiving terminal has triggered an SL RLF, the MAC layer of the transmitting terminal may notify the RRC layer of the transmitting terminal that the unicast connection has triggered an SL RLF. The RRC layer releases the unicast connection so that the transmitting terminal and the receiving terminal can re-establish a unicast connection to ensure normal communication.

[0095] By implementing the embodiments of the present disclosure, the problem of how to effectively detect RLF in a sidelink carrier aggregation scenario can be solved, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0096] It should be noted that, in some embodiments of the present disclosure, the transmitting terminal may maintain a first variable for each unicast connection, and the first variable is used to count the number of continuous and discontinuous DTX transmissions of the unicast connection on the multiple carriers. Among them, the transmitting terminal maintaining the first variable can be understood as the transmitting terminal managing the first variable. For example, the transmitting terminal can initialize the first variable to 0, or reset it to 0 or add 1. That is to say, for a unicast connection, the transmitting terminal can count the number of continuous DTXs of the unicast connection on multiple carriers through the first variable associated with the unicast connection, so that it can determine whether the unicast connection triggers SLRLF based on the number of continuous DTXs counted by the first variable. Specifically, please refer to Figure 3, which is a flowchart of another side link radio link failure detection method provided by an embodiment of the present disclosure. It should be noted that the method is executed by the transmitting terminal. As shown in Figure 3, the method may include but is not limited to the following steps.

[0097] In step 301, it is determined whether a transmitting terminal receives HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on any carrier among multiple carriers associated with a unicast connection.

[0098] It should be noted that the PSSCH mentioned in the present disclosure refers to the PSSCH associated with the unicast connection, and this explanation is applicable to any embodiment of the present disclosure.

[0099] Among them, in the embodiment of the present disclosure, the unicast connection is a unicast connection between a transmitting terminal and a receiving terminal, and the unicast connection is associated with multiple carriers, that is, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, that is, the transmitting terminal and the receiving terminal are configured with carrier aggregation, and the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers. It should be noted that, in this embodiment, the transmitting terminal can maintain a first variable separately for the unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on multiple carriers. In this way, for the unicast connection, the transmitting terminal can determine whether the transmitting terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any carrier, so as to determine whether the unicast connection triggers SL RLF based on whether the transmitting terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any carrier, and the first variable.

[0100] In step 302, it is determined whether to update the first variable according to whether the transmitting terminal receives HARQ feedback at a PSFCH reception opportunity associated with PSSCH transmission on any carrier among multiple carriers associated with the unicast connection.

[0101] In an embodiment of the present disclosure, for the unicast connection, the transmitting terminal can determine whether to update the first variable based on whether the transmitting terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any carrier among the multiple carriers associated with the unicast connection.

[0102] In one possible implementation, for the unicast connection, whenever the transmitting terminal does not receive HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on any carrier associated with the unicast connection, the first variable is determined to be incremented by 1. That is, if the transmitting terminal determines that HARQ feedback has not been received at a PSFCH reception opportunity associated with a PSSCH transmission on a carrier associated with a unicast connection, the first variable is updated, for example, by increasing the value of the first variable by 1. When the transmitting terminal determines that HARQ feedback has not been received at a PSFCH reception opportunity associated with a PSSCH transmission on another carrier associated with the unicast connection, the first variable is updated again, and so on.

[0103] Optionally, in one implementation, since each carrier corresponds to a different HARQ entity, the different HARQ entities corresponding to each carrier can count the number of DTX events on each carrier. Optionally, in one implementation, the MAC (Media Access Control) entity of the transmitting terminal can count the number of DTX events on each carrier.

[0104] As an example, for the unicast connection, the transmitting terminal counts whether DTX occurs at each PSFCH reception opportunity associated with each PSSCH transmission on all carriers associated with the unicast connection. If no HARQ feedback is detected at the PSFCH reception opportunity, it is determined that DTX has occurred at the PSFCH reception opportunity, and the transmitting terminal updates the first variable corresponding to the unicast connection, for example, by adding 1 to the first variable corresponding to the unicast connection. Optionally, for the unicast connection, if the transmitting terminal detects HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on any carrier associated with the unicast connection, the first variable is reset to 0. In one implementation, for the unicast connection, if the transmitting terminal detects HARQ feedback at a PSFCH reception opportunity associated with any PSSCH transmission on any carrier associated with the unicast connection, the transmitting terminal may reset the first variable to 0.

[0105] For example, taking the unicast connection associated with carrier 1 and carrier 2 as an example, for the unicast connection, if the transmitting terminal does not detect HARQ feedback at the reception timing of the PSFCH associated with the PSSCH sent on carrier 1, the transmitting terminal increments the first variable by 1. If the transmitting terminal does not detect HARQ feedback at the reception timing of the PSFCH associated with the PSSCH sent on carrier 2, the transmitting terminal increments the first variable by 1 again. If the transmitting terminal does not detect HARQ feedback at the reception timing of the PSFCH associated with the PSSCH sent on carrier 1, the transmitting terminal increments the first variable by 1. If the transmitting terminal detects HARQ feedback at the reception timing of the PSFCH associated with the PSSCH sent on carrier 2, the transmitting terminal resets the first variable to 0.

[0106] As another example, for the unicast connection, if the transmitting terminal does not detect HARQ feedback on the first PSFCH reception opportunity (for example, the PSFCH reception opportunity associated with the PSSCH sent on carrier 1), the transmitting terminal adds 1 to the first variable; if the transmitting terminal does not detect HARQ feedback on the second PSFCH reception opportunity (for example, the PSFCH reception opportunity associated with the PSSCH sent on carrier 2), the second PSFCH reception opportunity is the next PSFCH reception opportunity of the first PSFCH reception opportunity, and the second PSFCH reception opportunity and the first PSFCH reception opportunity may belong to the same carrier or may belong to different carriers, the transmitting terminal adds 1 to the first variable. Optionally, if the transmitting terminal does not detect HARQ feedback on the first PSFCH reception opportunity, the transmitting terminal adds 1 to the first variable; if HARQ feedback is detected on the second PSFCH reception opportunity, the transmitting terminal resets the first variable to 0.

[0107] It should be noted that in the embodiments of the present disclosure, when the unicast connection is established, the sending terminal initializes the first variable corresponding to the unicast connection to 0. Alternatively, when the first threshold associated with the first variable is reconfigured, the sending terminal initializes the first variable corresponding to the unicast connection to 0. Alternatively, when the first threshold associated with the first variable is initially configured, the sending terminal initializes the first variable corresponding to the unicast connection to 0. The initial configuration can be understood as the first time the network device configures the first threshold for the sending terminal.

[0108] In step 303, when the first variable is greater than or equal to the first threshold, it is determined that the unicast connection triggers SL RLF.

[0109] In an embodiment of the present disclosure, if the first variable associated with the unicast connection is greater than or equal to a first threshold, the transmitting terminal deems that a SL RLF has occurred in the unicast connection based on HARQ feedback, and the MAC layer of the transmitting terminal may notify the RRC layer of the transmitting terminal that the sending of the unicast connection has triggered the SL RLF. The RRC layer releases the unicast connection so that the transmitting terminal and the receiving terminal can re-establish a unicast connection to ensure normal communication.

[0110] That is to say, when the transmitting terminal detects that no HARQ feedback is received at the PSFCH receiving timing, a DTX is counted. In an embodiment of the present disclosure, the number of consecutive DTXs on all carriers associated with the unicast connection can be counted through a first variable. When the transmitting terminal receives HARQ feedback on any carrier among all carriers associated with the unicast connection, the transmitting terminal resets the first variable to 0; if the transmitting terminal does not receive HARQ feedback at the PSFCH receiving timing associated with the PSSCH transmission on any carrier among all carriers associated with the unicast connection, the first variable is determined to be increased by 1. When the number of consecutive times that no HARQ feedback is received on all carriers associated with the unicast connection is greater than or equal to the first threshold, that is, the first variable is greater than or equal to the first threshold, it can be determined that the unicast connection has triggered SL RLF.

[0111] It should be noted that the detection of "whether HARQ feedback is received" mentioned in this disclosure is based on the timing of the PSFCH. That is, if there is a PSFCH to be received on a carrier, then the detection is performed to determine whether HARQ feedback is received at the reception timing of the PSFCH on that carrier. The PSFCHs on different carriers may be staggered, depending on which carrier the scheduled PSSCH is on. For example, if the scheduled PSSCH is on carrier 1, then the detection is performed to determine whether HARQ feedback is received at the reception timing of the PSFCH associated with the PSSCH on carrier 1. If no HARQ feedback is received at the reception timing of the PSFCH associated with the PSSCH on carrier 1, then the first variable is incremented by 1.

[0112] Optionally, in some embodiments of the present disclosure, the transmitting terminal may obtain the first threshold value through first configuration information; the first threshold value is configured according to terminal granularity (per UE). As an example, the first configuration information may be configuration information sent by a network device to the transmitting terminal, or may be pre-configured information. In other words, the transmitting terminal may obtain the first threshold value from the configuration or pre-configuration of the network device.

[0113] For example, a sending terminal in an RRC connected state can obtain the first threshold through dedicated signaling, a sending terminal in an RRC IDLE (idle) / INACTIVE (inactive) state can obtain the first threshold through SIB (System Information Block), and a sending terminal in OOC (Out of coverage) can obtain the first threshold through pre-configuration.

[0114] In an embodiment of the present disclosure, sidelink communication is performed between a transmitting terminal and a receiving terminal through multiple carriers, and the transmitting terminal can maintain the same DTX detection variable (i.e., the above-mentioned first variable) on all carriers for each unicast connection. In this way, when the first variable reaches a first threshold, it is determined that the unicast connection has triggered SLRLF, thereby solving the problem of how to effectively detect RLF in a sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0115] It should be noted that, in some embodiments of the present disclosure, a unicast connection is established between the transmitting terminal and the receiving terminal, and the transmitting terminal can independently maintain a second variable for each carrier associated with the unicast connection, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable. Among them, the transmitting terminal maintaining the second variable can be understood as the transmitting terminal managing the second variable. For example, the transmitting terminal can initialize the second variable to 0, or reset it to 0 or add 1. That is to say, if the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers, the transmitting terminal counts the number of DTXs for each carrier associated with the unicast connection. Optionally, the transmitting terminal maintains a continuous DTX detection variable (such as the above-mentioned second variable) for each carrier associated with the unicast connection, and the second variable is used to count the number of consecutive DTXs for the unicast connection on the carrier corresponding to the second variable. Specifically, please refer to Figure 4, which is a flowchart of another sidelink radio link failure detection method provided in an embodiment of the present disclosure. It should be noted that the method is executed by the transmitting terminal. As shown in Figure 4, the method may include but is not limited to the following steps.

[0116] In step 401, for the unicast connection, it is determined whether the transmitting terminal receives HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on a first carrier.

[0117] Wherein, in an embodiment of the present disclosure, the first carrier is any carrier among multiple carriers associated with a unicast connection. The unicast connection is a unicast connection between a transmitting terminal and a receiving terminal, and the unicast connection is associated with multiple carriers, that is, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, that is, the transmitting terminal and the receiving terminal are configured with carrier aggregation, and the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers, and the transmitting terminal counts the number of DTXs for each carrier associated with the unicast connection. It should be noted that, in this embodiment, the transmitting terminal maintains a continuous DTX detection variable (such as the second variable mentioned above) for each carrier associated with the unicast connection, and the second variable is used to count the number of continuous DTXs for this unicast connection on the carrier corresponding to the second variable. In this way, for the unicast connection, the sending terminal can determine whether the sending terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on different carriers associated with the unicast connection, so as to determine whether the unicast connection triggers SL RLF based on whether the sending terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on different carriers associated with the unicast connection, and the second variables associated with each of the different carriers associated with the unicast connection.

[0118] In step 402, for the unicast connection, it is determined whether to update the second variable associated with the first carrier according to whether the transmitting terminal receives HARQ feedback at a PSFCH reception opportunity associated with the PSSCH transmission on the first carrier.

[0119] In one possible implementation, the first carrier is any carrier among multiple carriers associated with a unicast connection. For the unicast connection, if the transmitting terminal does not receive HARQ feedback at a PSFCH reception timing associated with PSSCH transmission on the first carrier associated with the unicast connection, then the second variable associated with the first carrier is determined to be incremented by 1. Optionally, for the unicast connection, if the transmitting terminal does not receive HARQ feedback at a PSFCH reception timing associated with PSSCH transmission on different carriers associated with the unicast connection, then the second variable associated with each of the different carriers associated with the unicast connection is determined to be incremented by 1.

[0120] As an example, the transmitting terminal counts the number of consecutive DTXs on each carrier associated with the unicast connection. Exemplarily, each carrier corresponds to a different HARQ entity, and the number of DTXs on each carrier can be counted by the different HARQ entities corresponding to each carrier. Optionally, the transmitting terminal counts whether HARQ feedback is received at each PSFCH reception opportunity associated with each PSSCH transmission on each carrier, that is, counts whether DTX occurs. If no HARQ feedback is detected at the PSFCH reception opportunity associated with the PSSCH transmission on a certain carrier, the transmitting terminal adds 1 to the second variable corresponding to the carrier.

[0121] For example, taking the unicast connection associated carrier 1 and carrier 2 as an example, for this unicast connection, the sending terminal does not detect HARQ feedback at the PSFCH reception timing associated with the PSSCH sent on carrier 1, then the sending terminal adds 1 to the second variable corresponding to carrier 1, and the sending terminal does not detect HARQ feedback at the PSFCH reception timing associated with the PSSCH sent on carrier 2, then the sending terminal adds 1 to the second variable corresponding to carrier 2.

[0122] In step 403, when the second variables associated with all carriers associated with the unicast connection are greater than or equal to the second threshold, it is determined that the unicast connection triggers SL RLF.

[0123] In one implementation, if the second variables associated with different carriers are all greater than or equal to the second threshold, the transmitting terminal believes that the unicast connection has a SL RLF based on HARQ feedback, that is, it is determined that the unicast connection has triggered a SL RLF. That is, if the second variable associated with any carrier is greater than or equal to the second threshold, the transmitting terminal believes that the carrier has a SL RLF based on HARQ feedback. The "carrier has a SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches the maximum threshold. There may be other naming forms, such as "radio link failure of the carrier", etc., which are not specifically limited in this disclosure. The MAC layer of the transmitting terminal can notify the RRC layer of the transmitting terminal that the carrier has a SL RLF based on HARQ feedback. When the second variables associated with all carriers are greater than or equal to the second threshold, the transmitting terminal believes that the unicast connection has a SL RLF based on HARQ feedback, and the MAC layer of the transmitting terminal can notify the RRC layer of the transmitting terminal that the unicast connection has a SL RLF based on HARQ feedback. The RRC layer releases the unicast connection so that the sending terminal and the receiving terminal can re-establish the unicast connection to ensure normal communication.

[0124] In some embodiments of the present disclosure, for the unicast connection, if the transmitting terminal receives HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on any carrier associated with the unicast connection, the transmitting terminal determines that the second variable associated with the carrier is reset to 0. That is, for the unicast connection, if the transmitting terminal detects HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on any carrier associated with the unicast connection, the transmitting terminal resets the second variable associated with the carrier to 0.

[0125] It should be noted that in the embodiment of the present disclosure, when a unicast connection is established, the transmitting terminal initializes the second variable corresponding to each carrier associated with the unicast connection to 0. Alternatively, when carrier aggregation is enabled, the transmitting terminal initializes the second variable corresponding to each carrier associated with the unicast connection to 0.

[0126] In one implementation, if the second threshold is configured according to terminal granularity (per UE), the transmitting terminal initializes the second variable corresponding to each carrier to 0 when the second threshold is reconfigured or initially configured, wherein the initial configuration can be understood as the first time the network device configures the second threshold for the transmitting terminal. Alternatively, in another implementation, if the second threshold is configured according to carrier granularity (per carrier), the transmitting terminal initializes the second variable corresponding to a certain carrier to 0 when the second threshold corresponding to the certain carrier is initially configured or reconfigured, wherein the initial configuration can be understood as the first time the network device configures the second threshold for the certain carrier.

[0127] In one possible implementation, if the second threshold is configured according to carrier granularity (per carrier), the number of carrier-associated second variables is greater than or equal to the number of carrier-associated second thresholds. For example, a unicast connection supports three carriers (e.g., carrier 1, carrier 2, and carrier 3), and the second variables corresponding to the three carriers are second variable 1, second variable 2, and second variable 3, respectively. If the second threshold is configured according to carrier granularity (per carrier), the number of the second thresholds can be three (e.g., second threshold a, second threshold b, and third threshold c), where the threshold corresponding to carrier 1 / second variable 1 is second threshold a, the threshold corresponding to carrier 2 / second variable 2 is second threshold b, and the threshold corresponding to carrier 3 / second variable 3 is second threshold c. For another example, a unicast connection supports three carriers (e.g., carrier 1, carrier 2, and carrier 3), and the second variables corresponding to each of the three carriers are second variable 1, second variable 2, and second variable 3, respectively. If the second threshold is a threshold configured according to carrier granularity (per carrier), the number of second thresholds may be two (e.g., second threshold a and second threshold b), with the threshold corresponding to carrier 1 / second variable 1 being second threshold a, the threshold corresponding to carrier 2 / second variable 2 being second threshold b, and the threshold corresponding to carrier 3 / second variable 3 being second threshold a. For another example, a unicast connection supports three carriers (e.g., carrier 1, carrier 2, and carrier 3), and the second variables corresponding to each of the three carriers are second variable 1, second variable 2, and second variable 3, respectively. If the second threshold is a threshold configured according to carrier granularity (per carrier), the number of second thresholds may be one (e.g., second threshold a), with the threshold corresponding to carrier 1 / second variable 1 being second threshold a, the threshold corresponding to carrier 2 / second variable 2 being second threshold a, and the threshold corresponding to carrier 3 / second variable 3 being second threshold a.

[0128] Optionally, in some embodiments of the present disclosure, the sending terminal may obtain the second threshold value through second configuration information. As an example, the second configuration information may be configuration information sent by a network device to the sending terminal, or may be pre-configured information. In other words, the sending terminal may obtain the second threshold value from the configuration or pre-configuration of the network device.

[0129] For example, a sending terminal in an RRC connected state can obtain the second threshold through dedicated signaling, a sending terminal in an RRC IDLE / INACTIVE state can obtain the second threshold through SIB, and a sending terminal in an OOC state can obtain the second threshold through pre-configuration.

[0130] Optionally, in some embodiments of the present disclosure, if it is determined that the second variable corresponding to any carrier is greater than or equal to the second threshold, and the allocation method of the terminal side link transmission resources is the second allocation method, the transmitting terminal triggers resource reselection and / or carrier reselection; the second allocation method is a method in which the transmitting terminal autonomously selects the transmission resources. The second variable corresponding to the reselected carrier is less than the second threshold; or, the second variable corresponding to the reselected carrier is less than or equal to a third threshold, and the third threshold is less than the second threshold. In one possible implementation, if the second threshold is configured according to the carrier granularity (per carrier), the second variable corresponding to any carrier is greater than or equal to the second threshold, specifically referring to that the second variable corresponding to any carrier is greater than or equal to the second threshold associated with any carrier.

[0131] For example, when a transmitting terminal in the second allocation mode (such as mode 2 described above) detects that a second variable associated with a carrier associated with a unicast connection is greater than or equal to a second threshold, the transmitting terminal triggers resource reselection and / or carrier reselection. Optionally, the transmitting terminal may reselect a carrier and further reselect resources on the reselected carrier. That is to say, the transmitting terminal does not perform SL transmission on the carrier whose associated second variable is greater than or equal to the second threshold, but the transmitting terminal reselects the carrier and further reselects resources on the reselected carrier, wherein the second variable associated with the carrier reselected by the transmitting terminal is less than the second threshold (that is, does not reach the second threshold, or the second variable associated with the carrier reselected by the transmitting terminal is less than or equal to a third threshold, and the third threshold is less than the second threshold. The SL transmission includes but is not limited to at least one of the following: PSSCH transmission, PSCCH transmission, PSFCH transmission, etc. Exemplarily, the reselected carrier may need to meet other conditions in some related technologies, including but not limited to CBR, etc., which are not specifically limited in the present invention and will not be elaborated on. That is to say, the reselected carrier in the present disclosure may need to meet other conditions in some related technologies on the basis of meeting other conditions in some related technologies, and the influence of DTX based on HARQ feedback needs to be considered. The example of such other conditions including but not limited to CBR is only for the convenience of understanding of those skilled in the art and cannot be used as a specific limitation of the present disclosure. That is to say, the reselected carrier may need to meet other conditions in some related technologies on the basis of considering the influence of DTX based on HARQ feedback, which will not be elaborated on here.

[0132] It should be noted that, in some embodiments of the present disclosure, the sending terminal can obtain the third threshold through third configuration information. Exemplarily, the third threshold is configured according to the terminal granularity. As an example, the third configuration information may be configuration information sent by the network device to the sending terminal, or it may be pre-configuration information. That is, the sending terminal can obtain the third threshold from the configuration or pre-configuration of the network device. For example, a sending terminal in an RRC connected state can obtain the third threshold through dedicated signaling, a sending terminal in an RRC IDLE / INACTIVE state can obtain the third threshold through SIB, and a sending terminal in OOC (Out of coverage) can obtain the third threshold through pre-configuration.

[0133] Optionally, in some embodiments of the present disclosure, if the second variable is greater than or equal to the second threshold, the transmitting terminal sends a first message to the network device, and the first message is used to indicate that the carrier corresponding to the second variable has an SL RLF based on HARQ feedback. The "carrier has an SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches the maximum threshold. There may be other naming forms, such as "radio link failure of the carrier", etc., which are not specifically limited in the present disclosure; wherein, the transmitting terminal is in an RRC connection state. For example, if a transmitting terminal in a first allocation mode (such as mode1 above) and / or a second allocation mode (such as mode2 above) connection state detects that at least one carrier-associated second variable is greater than or equal to the second threshold, the transmitting terminal may report it to the network device. Exemplarily, if the transmitting terminal detects that at least one carrier-associated second variable is greater than or equal to the second threshold, the transmitting terminal sends a first message to the network device, and indicates through the first message that the carrier corresponding to the second variable has an SL RLF based on HARQ feedback. For example, the transmitting terminal triggers an SL RLF report based on HARQ feedback (there may be other naming forms, which are not specifically limited). The "carrier SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches the maximum threshold. It may have other naming forms, such as "carrier radio link failure", etc., which is not specifically limited in this disclosure.

[0134] Optionally, in some embodiments of the present disclosure, the transmitting terminal may send the first information to the network device via SUI (Sidelink UE Information). Alternatively, the transmitting terminal may send the first information to the network device via UAI (UE Assistance Information). Alternatively, the transmitting terminal may send the first information to the network device via MAC (Media Access Control) CE (Control Element).

[0135] For example, the sending terminal may report to the network device in the form of SUI / UAI / MAC CE, etc., to indicate to the network device that the second variable associated with a certain carrier is greater than or equal to the second threshold. Optionally, if indicated by SUI / UAI, the carrier identifier may be carried, and the SUI / UAI indication is used to indicate to the network device that the second variable associated with the carrier corresponding to the carrier identifier is greater than or equal to the second threshold. If indicated by MAC CE, it may be indicated by a bitmap, and each bit in the bitmap corresponds to a carrier, for example, the i-th bit indicates whether the second variable associated with the carrier associated with carrier identifier i is greater than or equal to the second threshold. For example, if the bit value of the i-th bit is 1, it indicates that the second variable associated with the carrier associated with carrier identifier i is greater than or equal to the second threshold, and if the bit value of the i-th bit is 0, it indicates that the second variable associated with the carrier associated with carrier identifier i does not reach the second threshold, that is, the second variable associated with the carrier associated with carrier identifier i is less than the second threshold. For example, if the bit value of the i-th bit is 0, it means that the second variable associated with the carrier associated with carrier identifier i is greater than or equal to the second threshold; if the bit value of the i-th bit is 1, it means that the second variable associated with the carrier associated with carrier identifier i does not reach the second threshold, that is, the second variable associated with the carrier associated with carrier identifier i is less than the second threshold. This disclosure does not limit this.

[0136] That is, if the transmitting terminal detects that no HARQ feedback has been received during a PSFCH reception, a DTX is counted. In an embodiment of the present disclosure, a second variable can be used to count the number of consecutive DTXs of a unicast connection on the carrier corresponding to the second variable. That is, the number of DTXs on each carrier is counted separately. When the transmitting terminal receives HARQ feedback on a carrier associated with the unicast connection, the transmitting terminal resets the second variable corresponding to the carrier to 0. If the transmitting terminal does not receive HARQ feedback during a PSFCH reception associated with a PSSCH transmission on any carrier associated with the unicast connection, the second variable corresponding to the carrier is incremented by 1. When the second variable corresponding to the carrier is greater than or equal to a second threshold, it is determined that the carrier has triggered a SL RLF based on HARQ feedback. The term "SL RLF on a carrier based on HARQ feedback" described in the present disclosure refers to a state in which the second variable associated with the carrier reaches a maximum threshold. Other naming forms may exist, such as "radio link failure of a carrier," which are not specifically limited in the present disclosure. When the second variables used by all carriers associated with the unicast connection are greater than or equal to the second threshold, it can be determined that the unicast connection has triggered a SL RLF.

[0137] It should be noted that the detection of "whether HARQ feedback is received" mentioned in the present disclosure is detected according to the timing of PSFCH, that is, if there is a PSFCH on a carrier that needs to be received, it is detected whether HARQ feedback is received at the reception timing of the PSFCH on the carrier. Among them, the PSFCHs on different carriers may be staggered, depending on which carrier the scheduled PSSCH is on. For example, if the scheduled PSSCH is on carrier 1, it is detected whether HARQ feedback is received at the reception timing of the PSFCH associated with the PSSCH on carrier 1. If HARQ feedback is not received at the reception timing of the PSFCH associated with the PSSCH on carrier 1, the second variable corresponding to carrier 1 is increased by 1. For another example, if the scheduled PSSCH is on carrier 2, it is detected whether HARQ feedback is received at the reception timing of the PSFCH associated with the PSSCH on carrier 2. If HARQ feedback is not received at the reception timing of the PSFCH associated with the PSSCH on carrier 2, the second variable corresponding to carrier 2 is increased by 1.

[0138] In an embodiment of the present disclosure, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, and the transmitting terminal can maintain a respective DTX detection variable (i.e., the above-mentioned second variable) on different carriers for each unicast connection. In this way, when the second variables associated with all carriers reach the second threshold, the transmitting terminal determines that the unicast connection triggers SLRLF, thereby solving the problem of how to effectively detect RLF in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0139] It can be understood that the above embodiment describes the implementation of the radio link failure detection method of the side link of the embodiment of the present disclosure from the terminal device (i.e., the above-mentioned transmitting terminal) side. The embodiment of the present disclosure also proposes another radio link failure detection method of the side link, and the implementation of the radio link failure detection method of the side link will be described from the network device side. Please refer to Figure 5, which is a flowchart of another radio link failure detection method of the side link provided by the embodiment of the present disclosure. It should be noted that the method is executed by the network device. As shown in Figure 5, the method may include but is not limited to the following steps.

[0140] In step 501, first configuration information is sent to a sending terminal.

[0141] Among them, in an embodiment of the present disclosure, the first configuration information includes a first threshold value associated with a first variable, and the transmitting terminal maintains one first variable for each unicast connection. The unicast connection is a unicast connection established by the transmitting terminal and the receiving terminal on the side link. The carrier of the unicast connection supports multiple carriers. The transmitting terminal and the receiving terminal perform side link communication through the multiple carriers. The multiple carriers are associated with the unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers. Among them, the first variable is used by the transmitting terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF. In an embodiment of the present disclosure, for the relevant description of the first variable and the implementation method of the transmitting terminal determining whether the unicast connection triggers a side link SL radio link failure RLF, please refer to the description of the above-mentioned transmitting terminal side embodiment, which will not be repeated here.

[0142] In some embodiments of the present disclosure, the first threshold may be configured according to terminal granularity. The implementation of the first threshold may refer to the description of the above-mentioned transmitting terminal side embodiment, which will not be repeated here.

[0143] In an embodiment of the present disclosure, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, and the transmitting terminal can maintain the same DTX detection variable (i.e., the above-mentioned first variable) on all carriers for each unicast connection. In this way, the network device can configure the first threshold of the first variable to the transmitting terminal, so that when the transmitting terminal determines that the first variable reaches the first threshold, it determines that the unicast connection has triggered SLRLF, thereby solving the problem of how to effectively detect RLF in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0144] The present disclosure also provides another sidelink radio link failure detection method. The following describes the implementation of this sidelink radio link failure detection method from the perspective of a network device. Please refer to Figure 6, which is a flowchart of another sidelink radio link failure detection method provided by an embodiment of the present disclosure. It should be noted that this method is executed by a network device. As shown in Figure 6, this method may include, but is not limited to, the following steps.

[0145] In step 601, second configuration information is sent to a sending terminal.

[0146] In an embodiment of the present disclosure, the transmitting terminal and the receiving terminal establish a unicast connection on the sidelink, the unicast connection supports multiple carriers, the transmitting terminal and the receiving terminal perform sidelink communication through the multiple carriers, and the multiple carriers are associated with the unicast connection; the second configuration information includes a second threshold associated with a second variable, and the transmitting terminal independently maintains a second variable for each carrier, and the second variable is used to count the number of continuous and discontinuous transmissions DTX of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink SL radio link failure RLF. In an embodiment of the present disclosure, for the relevant description of the second variable and the implementation method of the transmitting terminal determining whether the unicast connection triggers a sidelink SL radio link failure RLF, please refer to the description of the above-mentioned transmitting terminal side embodiment, which will not be repeated here.

[0147] In some embodiments of the present disclosure, the second threshold is configured according to terminal granularity. In other embodiments, the second threshold is configured according to carrier granularity. The implementation of the second threshold can be found in the description of the transmitting terminal side embodiment above and will not be repeated here.

[0148] Optionally, in some embodiments of the present disclosure, the network device may send third configuration information to the transmitting terminal, where the third configuration information includes a third threshold value, where the third threshold value is less than the second threshold value, and the third threshold value is used by the transmitting terminal to reselect the carrier. The second allocation method for link transmission resources on the transmitting terminal side is the second allocation method, where the second allocation method is a method for the transmitting terminal to autonomously select transmission resources. The implementation method of the third threshold value can be found in the description of the transmitting terminal side embodiment above and is not further described here.

[0149] Optionally, in some embodiments of the present disclosure, the network device may receive the first information sent by the transmitting terminal, and the first information is used to indicate that the carrier corresponding to the second variable generates SL RLF based on HARQ feedback. The "carrier generates SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches the maximum threshold, and there may be other naming forms, such as "radio link failure of the carrier", etc., which are not specifically limited in the present disclosure. In one implementation method, the network device may receive the first information sent by the transmitting terminal through SUI; or the network device may receive the first information sent by the transmitting terminal through UAI; or the network device may receive the first information sent by the transmitting terminal through MACCE. The implementation method of the first information can refer to the description of the above-mentioned transmitting terminal side embodiment, which will not be repeated here.

[0150] In an embodiment of the present disclosure, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, and the transmitting terminal can maintain a respective DTX detection variable (i.e., the above-mentioned second variable) on different carriers for each unicast connection. In this way, the network device can configure a second threshold value of the second variable to the transmitting terminal, so that when the transmitting terminal determines that the second variable associated with all carriers reaches the second threshold value, it determines that the unicast connection has triggered SL RLF, thereby solving the problem of how to effectively detect RLF in the sidelink carrier aggregation scenario, so that the RLF mechanism can be supported in the carrier aggregation scenario of the sidelink communication.

[0151] In the embodiments provided above, the methods provided in the embodiments of the present disclosure are described from the perspectives of network devices and terminal devices (such as the above-mentioned sending terminal). In order to implement the various functions of the methods provided in the above-mentioned embodiments of the present disclosure, the network devices and terminal devices may include hardware structures and software modules, and implement the above-mentioned functions in the form of hardware structures, software modules, or hardware structures and software modules. One of the above-mentioned functions may be executed in the form of hardware structures, software modules, or hardware structures and software modules.

[0152] Please refer to Figure 7, which is a schematic diagram of the structure of a communication device 70 provided in an embodiment of the present disclosure. The communication device 70 shown in Figure 7 may include a transceiver module 701 and a processing module 702. The transceiver module 701 may include a sending module and / or a receiving module. The sending module is used to implement a sending function, and the receiving module is used to implement a receiving function. The transceiver module 701 can implement the sending function and / or the receiving function.

[0153] The communication device 70 may be a sidelink radio link failure detection device. For example, the communication device 70 may be a terminal device (such as the transmitting terminal in the aforementioned method embodiment), a device within a terminal device, or a device capable of being used in conjunction with a terminal device. Alternatively, the communication device 70 may be a network device, a device within a network device, or a device capable of being used in conjunction with a network device.

[0154] The communication device 70 is a terminal device (such as the transmitting terminal in the aforementioned method embodiment): the processing module 702 is used to determine the reception status of the hybrid automatic repeat request HARQ feedback on the physical sidelink feedback channel PSFCH; the processing module 702 is also used to determine whether the unicast connection triggers the sidelink SL radio link failure RLF based on the reception status of the HARQ feedback on the PSFCH; wherein the unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on the sidelink, and the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0155] In one implementation, the transmitting terminal maintains a first variable for each unicast connection, where the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers.

[0156] In one possible implementation, the processing module 702 is specifically configured to: for the unicast connection, determine whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any of the multiple carriers. The processing module 702 is specifically configured to: for the unicast connection, determine whether to update the first variable based on whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any of the multiple carriers; and determine that the unicast connection triggers SL RLF if the first variable is greater than or equal to a first threshold.

[0157] In one possible implementation, the processing module 702 is specifically configured to: for the unicast connection, whenever the transmitting terminal does not receive HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on any of the multiple carriers, determine that the first variable is increased by 1.

[0158] In one implementation, the processing module 702 is further configured to: for the unicast connection, if HARQ feedback is detected on a PSFCH reception opportunity associated with a PSSCH transmission on any carrier among the multiple carriers, determine that the first variable is reset to 0.

[0159] In one implementation, the processing module 702 is further configured to: obtain the first threshold through first configuration information; and the first threshold is configured according to terminal granularity.

[0160] In one implementation, the transmitting terminal independently maintains a second variable for each carrier, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable.

[0161] In one possible implementation, the processing module 702 is specifically used to: for the unicast connection, determine whether the transmitting terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on the first carrier, where the first carrier is any carrier among the multiple carriers associated with the unicast connection. The processing module 702 is specifically used to: for the unicast connection, determine whether to update the second variable associated with the first carrier based on whether the transmitting terminal receives HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on the first carrier; if the second variables associated with all carriers associated with the unicast connection are greater than or equal to the second threshold, it is determined that the unicast connection triggers SL RLF.

[0162] In a possible implementation, the processing module 702 is further configured to: obtain the second threshold through second configuration information, where the second threshold is configured according to terminal granularity.

[0163] In one implementation, the processing module 702 is specifically configured to: for the unicast connection, if the transmitting terminal does not receive HARQ feedback at a PSFCH reception opportunity associated with the PSSCH transmission on the first carrier, determine to increase the second variable associated with the first carrier by 1.

[0164] In a possible implementation, the processing module 702 is further configured to: for the unicast connection, when the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with the PSSCH transmission on the first carrier, determine that the second variable associated with the first carrier is reset to 0.

[0165] In one possible implementation, processing module 702 is further configured to: trigger resource reselection and / or carrier reselection upon determining that the second variable corresponding to the first carrier is greater than or equal to the second threshold, and the terminal-side link transmission resource allocation method is a second allocation method; the second allocation method is a method in which the transmitting terminal autonomously selects transmission resources. The second variable corresponding to the reselected carrier is less than the second threshold; or the second variable corresponding to the reselected carrier is less than or equal to a third threshold, and the third threshold is less than the second threshold.

[0166] In a possible implementation, the processing module 702 is further configured to: obtain the third threshold through third configuration information, where the third threshold is configured according to terminal granularity.

[0167] In one possible implementation, the transceiver module 701 is used to: when the second variable is greater than or equal to the second threshold, send first information to the network device, where the first information is used to indicate that the carrier corresponding to the second variable generates SL RLF based on HARQ feedback. The "carrier generates SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches the maximum threshold, and there may be other naming forms, such as "radio link failure of the carrier", etc., which are not specifically limited in this disclosure; wherein, the sending terminal is in a radio resource control RRC connection state.

[0168] In one possible implementation, the transceiver module 701 is specifically used to: send the first information to the network device through the side link terminal information SUI; or, send the first information to the network device through the terminal auxiliary information UAI; or, send the first information to the network device through the media access control MAC control unit CE.

[0169] The communication device 70 is a network device: a transceiver module 701 is used to send first configuration information to a sending terminal; wherein the first configuration information includes a first threshold value associated with a first variable, and the sending terminal maintains one first variable for each unicast connection, and the unicast connection is a unicast connection established between the sending terminal and the receiving terminal on the side link, and the sending terminal and the receiving terminal perform side link communication through multiple carriers, and the multiple carriers are associated with the unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein the first variable is used by the sending terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

[0170] In one implementation, the first threshold is configured according to terminal granularity.

[0171] The communication device 70 is a network device: a transceiver module 701 is used to send second configuration information to a transmitting terminal; wherein the transmitting terminal establishes a unicast connection with the receiving terminal on a sidelink, and the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, wherein the multiple carriers are associated with the unicast connection; the second configuration information includes a second threshold associated with a second variable, and the transmitting terminal independently maintains a second variable for each carrier, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink (SL) radio link failure (RLF). The second threshold is configured according to terminal granularity.

[0172] In one implementation: the transceiver module 701 is also used to: send third configuration information to the sending terminal, the third configuration information includes a third threshold, the third threshold is less than the second threshold, and the third threshold is used by the sending terminal to reselect the carrier, wherein the allocation method of the side link sending resources of the sending terminal is the second allocation method, and the second allocation method is a method for the sending terminal to autonomously select the sending resources.

[0173] In one implementation: the transceiver module 701 is further used to: receive first information sent by the transmitting terminal, where the first information is used to indicate that the carrier corresponding to the second variable generates an SL RLF based on HARQ feedback. The "carrier generates an SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches a maximum threshold, and may have other naming forms, such as "radio link failure of the carrier", etc., which is not specifically limited in this disclosure.

[0174] In one possible implementation, the transceiver module 701 is specifically used to: receive the first information sent by the sending terminal through the side link terminal information SUI; or, receive the first information sent by the sending terminal through the terminal auxiliary information UAI; or, receive the first information sent by the sending terminal through the media access control MAC control unit CE.

[0175] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0176] Please refer to Figure 8, which is a schematic diagram of the structure of another communication device 80 provided in an embodiment of the present disclosure. Communication device 80 can be a network device, a terminal device (such as the transmitting terminal in the aforementioned method embodiment), a chip, a chip system, or a processor that supports the network device to implement the aforementioned method, or a chip, a chip system, or a processor that supports the terminal device to implement the aforementioned method. This device can be used to implement the method described in the aforementioned method embodiment. For details, please refer to the description of the aforementioned method embodiment.

[0177] The communication device 80 may include one or more processors 801. The processor 801 may be a general-purpose processor or a dedicated processor. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control the communication device (e.g., a base station, a baseband chip, a terminal device, a terminal device chip, a DU or CU, etc.), execute computer programs, and process computer program data.

[0178] Optionally, the communication device 80 may further include one or more memories 802, on which a computer program 804 may be stored. The processor 801 executes the computer program 804, causing the communication device 80 to perform the method described in the above method embodiment. Optionally, the memory 802 may also store data. The communication device 80 and the memory 802 may be provided separately or integrated together.

[0179] Optionally, the communication device 80 may further include a transceiver 805 and an antenna 806. The transceiver 805 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., and is configured to implement transceiver functions. The transceiver 805 may include a receiver and a transmitter. The receiver may be referred to as a receiver or a receiving circuit, etc., and is configured to implement a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., and is configured to implement a transmitting function.

[0180] Optionally, the communication device 80 may further include one or more interface circuits 807. The interface circuit 807 is configured to receive code instructions and transmit the code instructions to the processor 801. The processor 801 executes the code instructions to enable the communication device 80 to perform the method described in the above method embodiment.

[0181] The communication device 80 is a terminal device (such as the sending terminal in the aforementioned method embodiment): the processor 801 is used to execute steps 201 and 202 in Figure 2; execute steps 301, 302 and 303 in Figure 3; and steps 401, 402 and 403 in Figure 4.

[0182] The communication device 80 is a network device: the transceiver 805 is used to execute step 501 in FIG. 5 ; or execute step 601 in FIG. 6 .

[0183] In one implementation, processor 801 may include a transceiver for implementing receiving and transmitting functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and transmitting functions may be separate or integrated. The transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or may be used for transmitting or delivering signals.

[0184] In one implementation, the processor 801 may store a computer program that runs on the processor 801, enabling the communication device 80 to perform the method described in the above method embodiment. The computer program may be fixed in the processor 801, in which case the processor 801 may be implemented by hardware.

[0185] In one implementation, the communication device 80 may include a circuit that can implement the functions of sending, receiving, or communicating in the aforementioned method embodiments. The processor and transceiver described in the present disclosure can be implemented on an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (nMetal-oxide-semiconductor, NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0186] The communication device described in the above embodiments may be a network device or a terminal device (such as the transmitting terminal in the aforementioned method embodiment), but the scope of the communication device described in this disclosure is not limited thereto, and the structure of the communication device may not be limited to FIG8. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be:

[0187] (1) An independent integrated circuit (IC), or chip, or chip system or subsystem;

[0188] (2) a collection of one or more ICs, optionally including a storage component for storing data and computer programs;

[0189] (3) ASIC, such as modem;

[0190] (4) Modules that can be embedded in other devices;

[0191] (5) Receivers, terminal devices, intelligent terminal devices, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.;

[0192] (6)Others, etc.

[0193] If the communication device can be a chip or a chip system, please refer to the schematic diagram of the chip structure shown in Figure 9. The chip shown in Figure 9 includes a processor 901 and an interface 902. The number of processors 901 can be one or more, and the number of interfaces 902 can be multiple.

[0194] For the case where the chip is used to implement the functions of the terminal device in the embodiments of the present disclosure (such as the transmitting terminal in the aforementioned method embodiment):

[0195] Processor 901 is used to determine the reception status of hybrid automatic repeat request HARQ feedback on the physical sidelink feedback channel PSFCH; processor 901 is also used to determine whether the unicast connection triggers the sidelink SL radio link failure RLF based on the reception status of the HARQ feedback on the PSFCH; wherein the unicast connection is a unicast connection established between the sending terminal and the receiving terminal on the sidelink, and the sending terminal and the receiving terminal perform sidelink communication through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0196] In one implementation, the transmitting terminal maintains a first variable for each unicast connection, where the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers.

[0197] In one possible implementation, the processor 901 is specifically configured to: for the unicast connection, determine whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any of the multiple carriers. The processor 901 is specifically configured to: for the unicast connection, determine whether to update the first variable based on whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any of the multiple carriers; if the first variable is greater than or equal to a first threshold, determine that the unicast connection triggers SL RLF.

[0198] In one possible implementation, the processor 901 is specifically configured to: for the unicast connection, whenever the transmitting terminal does not receive HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on any of the multiple carriers, determine that the first variable is increased by 1.

[0199] In one implementation, the processor 901 is further configured to: for the unicast connection, if HARQ feedback is detected on a PSFCH reception opportunity associated with a PSSCH transmission on any one of the multiple carriers, determine that the first variable is reset to 0.

[0200] In one implementation, the processor 901 is further configured to: obtain the first threshold through first configuration information; and the first threshold is configured according to terminal granularity.

[0201] In one implementation, the transmitting terminal independently maintains a second variable for each carrier, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable.

[0202] In one possible implementation, the processor 901 is specifically configured to: for the unicast connection, determine whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with the PSSCH transmission on the first carrier, where the first carrier is any carrier among the multiple carriers associated with the unicast connection. The processor 901 is specifically configured to: for the unicast connection, determine whether to update a second variable associated with the first carrier based on whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with the PSSCH transmission on the first carrier; if the second variables associated with all carriers associated with the unicast connection are greater than or equal to a second threshold, determine that the unicast connection triggers SL RLF.

[0203] In a possible implementation manner, the processor 901 is further configured to: obtain the second threshold through second configuration information, where the second threshold is configured according to terminal granularity.

[0204] In one implementation, the processor 901 is specifically configured to: for the unicast connection, if the transmitting terminal does not receive HARQ feedback at a PSFCH reception timing associated with the PSSCH transmission on the first carrier, determine that the second variable associated with the first carrier is increased by 1.

[0205] In a possible implementation, the processor 901 is further configured to: for the unicast connection, when the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with the PSSCH transmission on the first carrier, determine that the second variable associated with the carrier is reset to 0.

[0206] In one possible implementation, the processor 901 is further configured to: trigger resource reselection and / or carrier reselection upon determining that the second variable corresponding to the first carrier is greater than or equal to the second threshold, and the terminal-side link transmission resource allocation method is the second allocation method; the second allocation method is a method in which the transmitting terminal autonomously selects transmission resources. The second variable corresponding to the reselected carrier is less than the second threshold; or the second variable corresponding to the reselected carrier is less than or equal to a third threshold, and the third threshold is less than the second threshold.

[0207] In a possible implementation manner, the processor 901 is further configured to: obtain the third threshold through third configuration information, where the third threshold is configured according to terminal granularity.

[0208] In one possible implementation, the interface 902 is used to: when the second variable is greater than or equal to the second threshold, send first information to the network device, where the first information is used to indicate that the carrier corresponding to the second variable generates SL RLF based on HARQ feedback. The "carrier generates SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches the maximum threshold, and may have other naming forms, such as "radio link failure of the carrier", etc., which is not specifically limited in this disclosure; wherein, the sending terminal is in a radio resource control RRC connection state.

[0209] In one possible implementation, interface 902 is specifically used to: send the first information to the network device through the side link terminal information SUI; or, send the first information to the network device through the terminal auxiliary information UAI; or, send the first information to the network device through the media access control MAC control unit CE.

[0210] For the case where the chip is used to implement the functions of the network device in the embodiments of the present disclosure:

[0211] Interface 902 is used to send first configuration information to the sending terminal; wherein the first configuration information includes a first threshold value associated with a first variable, and the sending terminal maintains one first variable for each unicast connection, and the unicast connection is a unicast connection established between the sending terminal and the receiving terminal on the side link, and the sending terminal and the receiving terminal perform side link communication through multiple carriers, and the multiple carriers are associated with the unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein the first variable is used by the sending terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

[0212] In one implementation, the first threshold is configured according to terminal granularity.

[0213] For the case where the chip is used to implement the functions of the network device in the embodiments of the present disclosure:

[0214] Interface 902 is configured to send second configuration information to a transmitting terminal; wherein the transmitting terminal establishes a unicast connection with a receiving terminal on a sidelink, and the transmitting terminal and the receiving terminal communicate on the sidelink via multiple carriers, wherein the multiple carriers are associated with the unicast connection; the second configuration information includes a second threshold associated with a second variable, and the transmitting terminal independently maintains a second variable for each carrier, and the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink (SL) radio link failure (RLF). The second threshold is configured according to terminal granularity.

[0215] In one implementation: interface 902 is also used to: send third configuration information to the transmitting terminal, the third configuration information includes a third threshold, the third threshold is less than the second threshold, and the third threshold is used by the transmitting terminal to reselect the carrier, wherein the allocation method of the side link transmission resources of the transmitting terminal is the second allocation method, and the second allocation method is a method for the transmitting terminal to autonomously select the transmission resources.

[0216] In one implementation: interface 902 is further used to: receive first information sent by the transmitting terminal, where the first information is used to indicate that the carrier corresponding to the second variable generates SL RLF based on HARQ feedback. The "carrier generates SL RLF based on HARQ feedback" described in the present invention refers to a state in which the second variable associated with the carrier reaches a maximum threshold. There may be other naming forms, such as "radio link failure of the carrier", etc., which are not specifically limited in this disclosure.

[0217] In one possible implementation, interface 902 is specifically used to: receive the first information sent by the sending terminal through the side link terminal information SUI; or, receive the first information sent by the sending terminal through the terminal auxiliary information UAI; or, receive the first information sent by the sending terminal through the media access control MAC control unit CE.

[0218] Optionally, the chip further includes a memory 903, which is used to store necessary computer programs and data.

[0219] Those skilled in the art will also appreciate that the various illustrative logical blocks and steps listed in the embodiments of the present disclosure may be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functionality for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present disclosure.

[0220] An embodiment of the present disclosure also provides a wireless link failure detection system for a side link, which includes a communication device as a terminal device (such as the transmitting terminal in the aforementioned method embodiment) in the embodiment of Figure 7 and a communication device as a network device, or the system includes a communication device as a terminal device (such as the transmitting terminal in the aforementioned method embodiment) in the embodiment of Figure 8 and a communication device as a network device.

[0221] The present disclosure also provides a communication system including a terminal device and a network device. The terminal device is configured to implement the method described in any of the above embodiments on the sending terminal side. The network device can be configured to implement the method described in any of the above embodiments on the network device side.

[0222] The present disclosure also provides a readable storage medium having instructions stored thereon, which implement the functions of any of the above method embodiments when executed by a computer.

[0223] The present disclosure also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0224] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program 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 program 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 accessed 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 high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0225] Those skilled in the art will understand that the various numerical numbers such as first and second involved in the present disclosure are only for the convenience of description and are not used to limit the scope of the embodiments of the present disclosure, and also indicate the order of precedence.

[0226] The at least one in the present disclosure can also be described as one or more, and the multiple can be two, three, four or more, which is not limited in the present disclosure. In the embodiments of the present disclosure, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order of precedence or size between the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0227] The correspondences shown in the tables of the present disclosure can be configured or predefined. The values ​​of the information in each table are merely examples and can be configured to other values, which are not limited by the present disclosure. When configuring the correspondences between information and parameters, it is not necessarily required to configure all the correspondences shown in each table. For example, in the tables of the present disclosure, the correspondences shown in certain rows may not be configured. For another example, appropriate deformation adjustments can be made based on the above tables, such as splitting, merging, etc. The names of the parameters shown in the titles of the above tables may also adopt other names that can be understood by the communication device, and the values ​​or representations of the parameters may also adopt other values ​​or representations that can be understood by the communication device. When implementing the above tables, other data structures may also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables or hash tables, etc.

[0228] The predefined in the present disclosure may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0229] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0230] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0231] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure 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 disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A method for detecting a radio link failure of a side link, characterized in that: The method is performed by a sending terminal, and the method includes: Determining the reception of hybrid automatic repeat request HARQ feedback on a physical sidelink feedback channel PSFCH; Determine whether the unicast connection triggers a sidelink SL radio link failure RLF according to the reception status of the HARQ feedback on the PSFCH; The unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, and the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, and the multiple carriers are associated with the unicast connection.

2. The method according to claim 1, characterized in that The transmitting terminal maintains a first variable for each of the unicast connections, where the first variable is used to count the number of consecutive discontinuous transmissions DTX of the unicast connection on the multiple carriers.

3. The method according to claim 2, characterized in that The determining of the reception status of hybrid automatic repeat request HARQ feedback on a physical sidelink feedback channel PSFCH comprises: For the unicast connection, determining whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any carrier among the multiple carriers; The determining, according to the reception status of the HARQ feedback on the PSFCH, whether the unicast connection triggers a sidelink SL radio link failure RLF comprises: For the unicast connection, determining whether to update the first variable according to whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any carrier among the multiple carriers; When the first variable is greater than or equal to a first threshold, it is determined that the unicast connection triggers SL RLF.

4. The method according to claim 3, characterized in that The determining whether to update the first variable according to whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a physical sidelink shared channel PSSCH transmission on any carrier among the multiple carriers includes: For the unicast connection, whenever the transmitting terminal does not receive HARQ feedback at a PSFCH reception opportunity associated with a PSSCH transmission on any carrier among the multiple carriers, the first variable is determined to be increased by 1.

5. The method according to any one of claims 2 to 4, characterized in that The method further comprises: For the unicast connection, the transmitting terminal detects HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on any carrier among the multiple carriers, and determines that the first variable is reset to 0.

6. The method according to any one of claims 3 to 5, characterized in that The method further comprises: The first threshold is obtained through first configuration information; the first threshold is configured according to terminal granularity.

7. The method according to claim 1, characterized in that The transmitting terminal independently maintains a second variable for each of the carriers, where the second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable.

8. The method according to claim 7, characterized in that The determining of the reception status of hybrid automatic repeat request HARQ feedback on a physical sidelink feedback channel PSFCH comprises: For the unicast connection, determining whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on a first carrier, where the first carrier is any carrier among the multiple carriers associated with the unicast connection; The determining, according to the reception status of the HARQ feedback on the PSFCH, whether the unicast connection triggers a sidelink SL radio link failure RLF comprises: For the unicast connection, determining whether to update a second variable associated with the first carrier according to whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on the first carrier; If the second variables associated with all the carriers associated with the unicast connection are greater than or equal to the second threshold, it is determined that the unicast connection triggers the SL RLF.

9. The method according to claim 8, characterized in that The method further comprises: The second threshold is obtained through second configuration information, and the second threshold is configured according to the terminal granularity.

10. The method according to claim 8, characterized in that The determining whether to update the second variable associated with the first carrier according to whether the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with the PSSCH transmission on the first carrier includes: For the unicast connection, if the transmitting terminal does not receive HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on the first carrier, a second variable associated with the first carrier is determined to be increased by 1.

11. The method according to any one of claims 8 to 10, characterized in that The method further comprises: For the unicast connection, the transmitting terminal receives HARQ feedback at a PSFCH reception timing associated with a PSSCH transmission on the first carrier, and determines that a second variable associated with the first carrier is reset to 0.

12. The method according to any one of claims 8 to 11, characterized in that The method further comprises: If it is determined that the second variable corresponding to the first carrier is greater than or equal to the second threshold, and the allocation method of the line link sending resources on the terminal side is the second allocation method, resource reselection and / or carrier reselection is triggered; the second allocation method is a method in which the sending terminal autonomously selects sending resources.

13. The method according to claim 12, characterized in that The second variable corresponding to the reselected carrier is smaller than the second threshold; or, The second variable corresponding to the reselected carrier is less than or equal to a third threshold, and the third threshold is less than the second threshold.

14. The method according to claim 13, characterized in that The method further comprises: The third threshold is obtained through third configuration information, and the third threshold is configured according to the terminal granularity.

15. The method according to any one of claims 8 to 14, characterized in that The method further comprises: When the second variable is greater than or equal to the second threshold, first information is sent to the network device, wherein the first information is used to indicate that the second variable associated with the carrier corresponding to the second variable is greater than or equal to the second threshold; wherein the sending terminal is in a radio resource control RRC connection state.

16. The method according to claim 15, characterized in that The sending of the first information to the network device includes any one of the following: Sending first information to the network device via sidelink terminal information SUI; Sending first information to the network device through terminal auxiliary information UAI; The first information is sent to the network device through the media access control MAC control element CE.

17. A method for detecting a radio link failure of a side link, characterized in that: The method is performed by a network device, and the method includes: Sending first configuration information to a sending terminal; wherein, The first configuration information includes a first threshold value associated with a first variable, the transmitting terminal maintains one first variable for each unicast connection, the unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication through multiple carriers, the first variable is used to count the number of continuous discontinuous transmissions DTX of the unicast connection on the multiple carriers, and the multiple carriers are associated with the unicast connection; wherein, The first variable is used by the sending terminal to determine whether the unicast connection triggers a sidelink SL radio link failure RLF.

18. The method according to claim 17, characterized in that The first threshold is configured according to the terminal granularity.

19. A method for detecting a radio link failure of a side link, characterized in that: The method is performed by a network device, and the method includes: Sending second configuration information to the sending terminal; wherein, The transmitting terminal and the receiving terminal establish a unicast connection on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, and the multiple carriers are associated with the unicast connection; The second configuration information includes a second threshold associated with a second variable, and the transmitting terminal independently maintains a second variable for each of the carriers, and the second variable is used to count the number of consecutive discontinuous transmissions DTX of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the transmitting terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

20. The method of claim 19, wherein: The second threshold is configured according to the terminal granularity.

21. The method of claim 19, wherein: The method further comprises: Send third configuration information to the transmitting terminal, the third configuration information including a third threshold, the third threshold is less than the second threshold, and the third threshold is used by the transmitting terminal to reselect the carrier, wherein the allocation method of the sidelink transmitting resources of the transmitting terminal is the second allocation method, and the second allocation method is a method for the transmitting terminal to autonomously select the transmitting resources.

22. The method of claim 19, wherein: The method further comprises: First information sent by the transmitting terminal is received, where the first information is used to indicate that a second variable associated with a carrier corresponding to the second variable is greater than or equal to a second threshold.

23. The method of claim 22, wherein: The receiving the first information sent by the sending terminal includes any one of the following: Receiving first information sent by the sending terminal through sidelink terminal information SUI; Receiving first information sent by the sending terminal through terminal auxiliary information UAI; The first information sent by the sending terminal through the media access control MAC control element CE is received.

24. A sidelink radio link failure detection device, characterized in that: The device comprises: A processing module, used to determine the reception of hybrid automatic repeat request HARQ feedback on a physical sidelink feedback channel PSFCH; The processing module is further used to determine whether the unicast connection triggers a side link SL radio link failure RLF according to the reception status of the HARQ feedback on the PSFCH; The unicast connection is a unicast connection established between the device and the receiving terminal on a sidelink, the device and the receiving terminal perform sidelink communication via multiple carriers, and the multiple carriers are associated with the unicast connection.

25. A sidelink radio link failure detection device, characterized in that: The device comprises: The transceiver module is used to send the first configuration information to the sending terminal; wherein, The first configuration information includes a first threshold value associated with a first variable, the transmitting terminal maintains one first variable for each unicast connection, the unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, the multiple carriers are associated with the unicast connection, and the first variable is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein, The first variable is used by the sending terminal to determine whether the unicast connection triggers a sidelink SL radio link failure RLF.

26. A sidelink radio link failure detection device, characterized in that: The device comprises: The transceiver module is used to send the second configuration information to the sending terminal; wherein, The transmitting terminal and the receiving terminal establish a unicast connection on a sidelink, the transmitting terminal and the receiving terminal perform sidelink communication via multiple carriers, and the multiple carriers are associated with the unicast connection; The second configuration information includes a second threshold associated with the second variable, and the transmitting terminal independently maintains a second threshold for each carrier. Two variables, the second variable is used to count the number of consecutive DTX of the unicast connection on the carrier corresponding to the second variable, wherein the second variable is used by the transmitting terminal to determine whether the unicast connection triggers a side link SL radio link failure RLF.

27. A communication device, characterized in that: The device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program stored in the memory so that the device performs the method according to any one of claims 1 to 16.

28. A communication device, characterized in that: The device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program stored in the memory so that the device performs the method according to claim 17 or 18.

29. A communication device, characterized in that: The device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program stored in the memory so that the device performs the method according to any one of claims 19 to 23.

30. A communication system, characterized in that: include: A terminal device, configured to implement the method according to any one of claims 1 to 16; A network device configured to implement the method according to any one of claims 17 to 23.

31. A computer-readable storage medium storing instructions, which, when executed, enable the method according to any one of claims 1 to 16 to be implemented.

32. A computer-readable storage medium storing instructions, which, when executed, enable the method according to claim 17 or 18 to be implemented.

33. A computer-readable storage medium storing instructions, which, when executed, enable the method according to any one of claims 19 to 23 to be implemented.

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