Method and apparatus for wireless link failure detection of sidelink

Abstract

The method comprises the following steps: a terminal device determines a reception condition of a hybrid automatic repeat request (HARQ) feedback on a physical sidelink feedback channel (PSFCH); and determines whether a unicast connection triggers a sidelink (SL) radio link failure (RLF) according to the reception condition of the HARQ feedback on the PSFCH. The unicast connection is a unicast connection established by a sending terminal and a receiving terminal on a 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. Through implementation of the embodiments of the present disclosure, the problem of how to effectively detect RLF in a sidelink carrier aggregation scenario can be solved, and the RLF mechanism can be supported in the sidelink carrier aggregation scenario.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a method and apparatus for detecting wireless link failure in a side-link. Background Technology

[0002] To support direct communication between terminals, a direct communication method (also called sidelink, SL) was introduced, with the interface between terminals being PC-5. Based on the correspondence between sending and receiving terminals, Sidelink supports three transmission modes: unicast, multicast, and broadcast.

[0003] For version R18 Sidelink, it supports carrier aggregation technology, which means that terminal-to-terminal communication can be achieved using sidelink carrier aggregation. This scenario can be called the sidelink carrier aggregation scenario.

[0004] However, there is currently a lack of effective means to detect wireless link failures in sidelink carrier aggregation scenarios. Summary of the Invention

[0005] This disclosure provides a method and apparatus for detecting radio link failure in sidelink communication, which can be applied to vehicle-to-everything (V2X) communication, long-term evolution-vehicle (LTE-V) communication, vehicle-to-vehicle (V2V) communication, etc., or can be used in fields such as intelligent driving and intelligent connected vehicles. It can solve the problem of how to effectively detect radio link failure (RLF) in sidelink carrier aggregation scenarios, enabling the RLF mechanism to be supported in carrier aggregation scenarios of sidelink communication.

[0006] In a first aspect, embodiments of this disclosure provide a method for detecting wireless link failure in a sidelink, the method being executed by a transmitting terminal, the method comprising:

[0007] Determine the reception status of Hybrid Automatic Repeat Request (HARQ) feedback on the physical side link feedback channel PSFCH;

[0008] Based on the reception status of HARQ feedback on PSFCH, determine whether the unicast connection triggers a side link SL radio link failure (RLF).

[0009] The unicast connection is a unicast connection established by the sending terminal and the receiving terminal on the side link. The sending terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0010] This technical solution addresses the problem of how to effectively detect RLF in sidelink carrier aggregation scenarios, enabling RLF mechanisms to be supported in sidelink communication carrier aggregation scenarios.

[0011] Secondly, embodiments of this disclosure provide another method for detecting wireless link failures on a side-link, the method being executed by a network device, the method comprising:

[0012] Send the first configuration information to the sending terminal; wherein,

[0013] The first configuration information includes a first threshold associated with a first variable. The transmitting terminal maintains one of the first variables 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 communicate via multiple carriers on the sidelink. The first variable is used to count the number of consecutive and non-consecutive DTX transmissions of the unicast connection on the multiple carriers. The multiple carriers are associated with the unicast connection.

[0014] The first variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink (SL) radio link failure (RLF).

[0015] In this technical solution, the transmitting terminal maintains a first variable for each unicast connection. This first variable is used to count the number of consecutive DTXs of the unicast connection on multiple carriers. By configuring a first threshold for this first variable for the transmitting terminal through the network device, the transmitting terminal can determine whether the unicast connection has triggered SLRLF through the first threshold. This can solve the problem of how to effectively detect RLF in side-link carrier aggregation scenarios, and enable the RLF mechanism to be supported in the carrier aggregation scenario of side-link communication.

[0016] Thirdly, embodiments of this disclosure provide another method for detecting wireless link failures on a side-link, the method being executed by a network device, the method comprising:

[0017] Send the second configuration information to the sending terminal; wherein,

[0018] The transmitting terminal and the receiving terminal establish a unicast connection on the side link. The transmitting terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0019] The second configuration information includes a second threshold associated with a second variable. The transmitting terminal independently maintains a second variable for each carrier. The second variable is used to count the number of consecutive and discontinuous DTX transmissions of the unicast connection on the carrier corresponding to the second variable. The second variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink (SL) radio link failure (RLF).

[0020] In this technical solution, the transmitting terminal independently maintains a second variable for each carrier. This second variable is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable. By configuring a second threshold for this second variable for the transmitting terminal through the network device, the transmitting terminal can determine whether the unicast connection has triggered SLRLF through the second threshold. This can solve the problem of how to effectively detect RLF in the side-link carrier aggregation scenario, and enable the RLF mechanism to be supported in the carrier aggregation scenario of side-link communication.

[0021] Fourthly, embodiments of this disclosure provide a wireless link failure detection device for a sidelink. The device has some or all of the functions of the transmitting terminal described in the first aspect above. For example, the device may have some or all of the functions described in the embodiments of this disclosure, or it may have the functions of any one embodiment of this disclosure implemented individually. The functions can be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0022] In one implementation, the device may include a transceiver module and a processing module, the processing module being configured to support the device in performing the corresponding functions described in the above method. The transceiver module supports communication between the device and other devices. The device may also include a storage module coupled to the transceiver module and the processing module, which stores necessary computer programs and data for the device.

[0023] In one implementation, the processing module is configured to determine the reception status of Hybrid Automatic Repeat Request (HARQ) feedback on the Physical Side Link Feedback Channel (PSFCH); the processing module is further configured to determine, based on the reception status of the HARQ feedback on the PSFCH, whether the unicast connection triggers a Side Link SL Radio Link Failure (RLF); wherein the unicast connection is a unicast connection established between the device and the receiving terminal on the side link, and the device and the receiving terminal communicate on the side link through multiple carriers, the multiple carriers being associated with the unicast connection.

[0024] As an example, the processing module can be a processor, the transceiver module can be a transceiver or a communication interface, and the storage module can be a memory.

[0025] Fifthly, embodiments of this disclosure provide another wireless link failure detection device for sidelinks. This device has some or all of the functions of the network device described in the examples of the methods described in the second aspect above. For example, the communication device may have the functions of some or all of the embodiments in this disclosure, or it may have the functions of any one embodiment in this disclosure implemented individually. The functions can 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.

[0026] 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 described in the above method. The transceiver module supports 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 necessary computer programs and data for the communication device.

[0027] In one implementation, the transceiver module is configured to send first configuration information to a transmitting terminal; wherein the first configuration information includes a first threshold associated with a first variable, the transmitting terminal maintains one of the first variables for each unicast connection, the unicast connection being a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal communicating via a sidelink through multiple carriers, the multiple carriers being associated with the unicast connection, and the first variable being used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein the first variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink SL radio link failure (RLF).

[0028] Sixthly, embodiments of this disclosure provide another wireless link failure detection device for sidelinks. This device has some or all of the functions of the network device described in the example of the method described in the third aspect above. For example, the communication device may have the functions of some or all of the embodiments in this disclosure, or it may have the functions of any one embodiment in this disclosure implemented individually. The functions can 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.

[0029] 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 described in the above method. The transceiver module supports 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 necessary computer programs and data for the communication device.

[0030] In one implementation, the transceiver module is used to send second configuration information to a transmitting terminal; wherein the transmitting terminal and the receiving terminal establish a unicast connection on a sidelink, the transmitting terminal and the receiving terminal communicate on the sidelink 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, the transmitting terminal independently maintains a second variable for each carrier, 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).

[0031] In a seventh aspect, embodiments of this disclosure provide a communication device including a processor that, when the processor invokes a computer program in memory, executes the method described in the first aspect.

[0032] Eighthly, embodiments of this disclosure provide a communication device including a processor that, when the processor invokes a computer program in memory, executes the method described in the second aspect above.

[0033] Ninthly, embodiments of this disclosure provide a communication device including a processor that, when the processor invokes a computer program in memory, executes the method described in the third aspect above.

[0034] In a tenth aspect, embodiments of this disclosure provide a communication device including a processor and a memory, the memory storing a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the first aspect above.

[0035] Eleventhly, embodiments of this disclosure provide a communication device including a processor and a memory, the memory storing a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the second aspect above.

[0036] In a twelfth aspect, embodiments of this disclosure provide a communication device including a processor and a memory storing a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the third aspect above.

[0037] In a thirteenth aspect, embodiments of this disclosure provide a communication device including a processor and an interface circuit. The interface circuit is configured to receive code instructions and transmit them to the processor, which is configured to execute the code instructions to cause the device to perform the method described in the first aspect above.

[0038] In a fourteenth aspect, embodiments of this disclosure provide a communication device including a processor and an interface circuit. The interface circuit is configured to receive code instructions and transmit them to the processor, which is configured to execute the code instructions to cause the device to perform the method described in the second aspect above.

[0039] In a fifteenth aspect, embodiments of this disclosure provide a communication device including a processor and an interface circuit. The interface circuit is configured to receive code instructions and transmit them to the processor, which is configured to execute the code instructions to cause the device to perform the method described in the third aspect above.

[0040] In a sixteenth aspect, embodiments of this disclosure provide a sidelink wireless link failure detection system, the system comprising 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 comprising 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 comprising the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the system comprising the communication device described in the seventh aspect and the communication device described in the ninth aspect, or the system comprising the communication device described in the tenth aspect and the communication device described in the eleventh aspect, or the system comprising the communication device described in the tenth aspect and the communication device described in the twelfth aspect, or the system comprising the communication device described in the thirteenth aspect and the communication device described in the fourteenth aspect, or the system comprising the communication device described in the thirteenth aspect and the communication device described in the fifteenth aspect.

[0041] In a seventeenth aspect, embodiments of this disclosure provide a computer-readable storage medium for storing instructions for use by the aforementioned transmitting terminal, which, when executed, cause the transmitting terminal to perform the method described in the first aspect.

[0042] In an eighteenth aspect, embodiments of this disclosure provide a readable storage medium for storing instructions for use by the network device described above, which, when executed, cause the network device to perform the method described in the second aspect.

[0043] In a nineteenth aspect, embodiments of this disclosure provide a readable storage medium for storing instructions for use by the network device described above, which, when executed, cause the network device to perform the method described in the third aspect.

[0044] In a twentieth aspect, this disclosure also provides a computer program product including a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above.

[0045] In a twentieth aspect, this disclosure also provides a computer program product including a computer program that, when run on a computer, causes the computer to perform the method described in the second aspect above.

[0046] In a twentieth aspect, this disclosure also provides a computer program product including a computer program that, when run on a computer, causes the computer to perform the method described in the third aspect above.

[0047] In a twentieth aspect, this disclosure provides a chip system including at least one processor and an interface for supporting a transmitting terminal in implementing the functions involved in the first aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the transmitting terminal. The chip system may be composed of chips or may include chips and other discrete devices.

[0048] In a twentieth aspect, this disclosure provides a chip system including at least one processor and an interface for supporting network devices in implementing the functions involved in the second aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the network device. The chip system may be composed of chips or may include chips and other discrete devices.

[0049] In a twentieth aspect, this disclosure provides a chip system including at least one processor and an interface for supporting network devices in implementing the functions involved in the third aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the network device. The chip system may be composed of chips or may include chips and other discrete devices.

[0050] In a twentieth aspect, this disclosure provides a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above.

[0051] In a twentieth aspect, this disclosure provides a computer program that, when run on a computer, causes the computer to perform the method described in the second aspect above.

[0052] In a twentieth aspect, this disclosure provides a computer program that, when run on a computer, causes the computer to perform the method described in the third aspect above.

[0053] In a twentieth aspect, this disclosure provides a communication system, comprising: a terminal device configured to implement the method described in the first aspect; and a network device configured to implement the method described in the second or third aspect. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments or background art of this disclosure, the accompanying drawings used in the embodiments or background art of this disclosure will be described below.

[0055] Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this disclosure;

[0056] Figure 2 This is a flowchart of a wireless link failure detection method for a side-link provided in an embodiment of this disclosure;

[0057] Figure 3 This is a flowchart of another side-link wireless link failure detection method provided in this disclosure embodiment;

[0058] Figure 4 This is a flowchart of another side-link wireless link failure detection method provided in this disclosure embodiment;

[0059] Figure 5 This is a flowchart of another side-link wireless link failure detection method provided in this disclosure embodiment;

[0060] Figure 6 This is a flowchart of another side-link wireless link failure detection method provided in this disclosure embodiment;

[0061] Figure 7 This is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure;

[0062] Figure 8 This is a schematic diagram of another communication device provided in an embodiment of this disclosure;

[0063] Figure 9 This is a schematic diagram of the structure of a chip provided in an embodiment of this disclosure. Detailed Implementation

[0064] The embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure. In the description of this disclosure, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0065] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0066] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the words “if” and “suppose” as used herein may be interpreted as “when”, “when”, or “in response to a determination”.

[0067] Embodiments of this disclosure are described in detail below, with examples of embodiments illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0068] To facilitate understanding, the terminology used in this disclosure will be introduced first.

[0069] 1. Sidelink (SL)

[0070] Links for direct communication between terminal devices.

[0071] 2. Vehicle-to-everything (V2X) communication

[0072] V2X communication refers to communication between a vehicle and anything in the outside world. V2X communication can 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.

[0073] It should be noted that, to support direct communication between terminal devices, a direct communication method (also called Sidelink, SL) is introduced, with the interface between terminal devices being PC-5. Based on the correspondence between sending and receiving terminals, three transmission modes are supported on Sidelink: unicast, multicast, and broadcast. The sending terminal transmits Sidelink Control Information (SCI) on the PSCCH (Physical Sidelink Control Channel) and a second-stage SCI on the PSSCH (Physical Sidelink Shared Channel), which carries the resource location of the transmitted data and source and destination identifiers. For data packets with HARQ (Hybrid Automatic Repeat reQuest) feedback enabled, the receiving terminal sends a HARQ-ACK (Hybrid Automatic Retransmission Request Acknowledgement) response to the PSSCH on the PSFCH (Physical Sidelink Feedback Channel).

[0074] Sidelink communication offers two resource allocation methods: dynamic scheduling (mode 1) and autonomous selection by the terminal from a pre-configured or network-configured resource pool (mode 2). Dynamic scheduling involves the network dynamically allocating sidelink resources to the terminal based on its cached data reports. Autonomous selection allows the terminal to randomly choose resources from the pre-configured or network-configured pools. Network devices can configure multiple resource pools for a single BWP (Band Width Part). The specific allocation method used is configured by the network device via RRC (Radio Resource Control) signaling.

[0075] Release 16 introduced an SL RLF (Sidelink Radio Link Failure) detection mechanism based on HARQ (Hybrid Automatic Repeat reQuest) feedback. For a unicast connection, if a terminal does not receive HARQ feedback for a certain number of consecutive times on the PSFCH (Physical Sidelink Shared Channel) resource, it considers that continuous DTX (Discontinuous Transmission) has occurred. The terminal considers that the unicast connection has experienced SL RLF based on HARQ feedback and notifies the RRC layer. The RRC controls the SL RLF detection based on HARQ feedback by configuring a maximum number of consecutive DTXs (sl-maxNumConsecutiveDTX) per terminal (per UE).

[0076] For version R18 Sidelink, it supports carrier aggregation technology, which means that terminal-to-terminal communication can be achieved using sidelink carrier aggregation. This scenario can be called the sidelink carrier aggregation scenario.

[0077] However, there is currently a lack of effective means to detect wireless link failures in sidelink carrier aggregation scenarios.

[0078] To address this, this disclosure proposes a method and apparatus for detecting wireless link failures in sidelink communication, which can solve the problem of how to effectively detect RLF in sidelink carrier aggregation scenarios, enabling RLF mechanism support in sidelink communication carrier aggregation scenarios.

[0079] To better understand the side-link wireless link failure detection method disclosed in this disclosure, the communication system to which this disclosure is applicable is first described below.

[0080] Please see Figure 1 , Figure 1 This 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. Figure 1 The number and form of devices shown are for illustrative purposes only and do not constitute a limitation on the embodiments of this disclosure. In actual applications, two or more network devices or two or more terminals may be included. Figure 1 The communication system shown is an example including a network device 101 and a terminal 102.

[0081] It should be noted that the technical solutions of this disclosure can be applied to various communication systems. For example, Long Term Evolution (LTE) systems, 5th 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 this disclosure can also be referred to as a side link or a direct link.

[0082] The network device 101 in this embodiment is a network-side entity used 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. This disclosure does not limit the specific technology or device form used in the network device. The network device provided in this disclosure can be composed of a centralized unit (CU) and a distributed unit (DU). The CU can also be called a control unit. Using a CU-DU structure allows the protocol layer of a network device, such as a base station, to be separated. Some protocol layer functions are centrally controlled by the CU, while the remaining part or all protocol layer functions are distributed in the DU, which is centrally controlled by the CU.

[0083] In this disclosure, terminal 102 is a user-side entity used for receiving or transmitting signals, such as a mobile phone. A terminal can also be called a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. A terminal can be a car with communication capabilities, a smart car, a mobile phone, a wearable device, a tablet computer, a computer with wireless transceiver capabilities, 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 a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. This disclosure does not limit the specific technology or device form used by the terminal. The transmitting terminal mentioned in this disclosure can refer to terminal 102.

[0084] It is understood that the communication system described in the embodiments of this disclosure is for the purpose of more clearly illustrating the technical solutions of the embodiments of this disclosure, and does not constitute a limitation on the technical solutions provided in the embodiments of this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this disclosure are also applicable to similar technical problems.

[0085] The following description, in conjunction with the accompanying drawings, details the method and apparatus for detecting wireless link failures in a side-link network provided in this disclosure.

[0086] Please see Figure 2 , Figure 2 This is a flowchart of a side-link wireless link failure detection method provided in an embodiment of this disclosure. It should be noted that this method is executed by the transmitting terminal. Figure 2 As shown, the method may include, but is not limited to, the following steps.

[0087] In step 201, the reception status of HARQ feedback on PSFCH is determined.

[0088] In embodiments of this disclosure, the transmitting terminal can transmit a second-stage SCI on the PSCCH channel and a second-stage SCI on the PSSCH channel. The second-stage SCI carries the resource location of the transmitted data, as well as source and destination identifiers. For data packets with HARQ feedback enabled, the receiving terminal provides HARQ-ACK (Hybrid Automatic Retransmission Request Acknowledgement) feedback on the PSFCH channel. Thus, the transmitting terminal can determine the reception status of the HARQ feedback on the PSFCH, and based on this reception status, detect whether an SLRLF has occurred in the unicast connection between the transmitting and receiving terminals. In other words, the transmitting terminal can determine whether an SLRLF has been triggered in the unicast connection between the transmitting and receiving terminals based on the reception status of the HARQ feedback on the PSFCH.

[0089] In step 202, based on the reception status of HARQ feedback on PSFCH, it is determined whether the unicast connection triggers SLRLF.

[0090] In the embodiments disclosed herein, the unicast connection is a unicast connection established on a side link between a transmitting terminal and a receiving terminal. The transmitting terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0091] In embodiments of this disclosure, the transmitting terminal can determine whether a unicast connection between itself and the receiving terminal has triggered an SL RLF based on the received HARQ feedback on the PSFCH. In other words, the transmitting terminal can detect whether a HARQ-based SL RLF has occurred in the unicast connection between itself and the receiving terminal based on the received HARQ feedback on the PSFCH. If a HARQ-based SL RLF is detected, it can be determined that the unicast connection has triggered an SL RLF. If no HARQ-based SL RLF is detected, it can be determined that the unicast connection has not triggered an SL RLF.

[0092] Optionally, in one implementation, if the sending terminal fails to receive HARQ feedback (discontinuous transmission, DTX) on the PSFCH resource for a certain number of consecutive times, it is determined that the unicast connection between the sending terminal and the receiving terminal has triggered SLRLF. Alternatively, if the number of consecutive times the sending terminal fails to receive HARQ feedback on the PSFCH resource is less than the aforementioned certain number, it is determined that the unicast connection between the sending terminal and the receiving terminal has not triggered SLRLF.

[0093] In one possible implementation, if the sending terminal determines that the unicast connection between it and the receiving terminal has triggered an SLRLF (Single-Level Relay Late LF), the sending terminal's MAC layer can notify its RRC (Relay Rate Control) layer to acknowledge that the unicast connection has triggered an SLRLF. The RRC layer then releases the unicast connection so that the sending and receiving terminals can re-establish the unicast connection, ensuring normal communication.

[0094] By implementing the embodiments of this disclosure, the problem of how to effectively detect RLF in sidelink carrier aggregation scenarios can be solved, enabling RLF mechanism to be supported in sidelink communication carrier aggregation scenarios.

[0095] It should be noted that in some embodiments of this disclosure, the transmitting terminal can maintain a first variable for each unicast connection. This first variable is used to count the number of consecutive discontinuous transmissions (DTXs) ​​of the unicast connection on the multiple carriers. 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, reset it to 0, or increment it by 1. In other words, for a unicast connection, the transmitting terminal can use the first variable associated with that unicast connection to count the number of consecutive DTXs of that unicast connection on multiple carriers, and thus determine whether the unicast connection has triggered SLRLF based on the number of consecutive DTXs counted by the first variable. For details, please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a flowchart of another side-link wireless link failure detection method provided in this disclosure embodiment. It should be noted that this method is executed by the transmitting terminal. Figure 3 As shown, the method may include, but is not limited to, the following steps.

[0096] In step 301, it is determined whether the transmitting terminal received HARQ feedback at the time of receiving PSFCH associated with PSSCH transmission on any of the multiple carriers associated with the unicast connection.

[0097] It should be noted that the PSSCH mentioned in this disclosure refers to the PSSCH associated with the unicast connection, and this interpretation applies to any embodiment of this disclosure.

[0098] In the embodiments of this disclosure, the unicast connection is a unicast connection between a transmitting terminal and a receiving terminal. This unicast connection is associated with multiple carriers, meaning that the unicast connection between the transmitting and receiving terminals supports multiple carriers. In other words, the transmitting and receiving terminals are configured with carrier aggregation, and they communicate via multiple carriers through the sidelink. It should be noted that in this embodiment, the transmitting terminal can maintain a separate first variable for this unicast connection. This first variable is used to count the number of consecutive DTX events of the unicast connection on multiple carriers. Thus, for this unicast connection, the transmitting terminal can determine whether it received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any carrier. Based on whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any carrier, and the first variable, it can determine whether the unicast connection triggered SL RLF.

[0099] In step 302, it is determined whether to update the first variable based on whether the transmitting terminal receives HARQ feedback during the PSFCH reception time associated with the PSSCH transmission on any of the multiple carriers associated with the unicast connection.

[0100] In the embodiments of this disclosure, for the unicast connection, the transmitting terminal can determine whether to update the first variable based on whether it receives HARQ feedback at the time of receiving the PSFCH associated with the PSSCH transmission on any of the multiple carriers associated with the unicast connection.

[0101] In one possible implementation, for the unicast connection, whenever the transmitting terminal does not receive HARQ feedback during the PSFCH reception phase associated with the PSSCH transmission on any carrier associated with the unicast connection, the first variable is incremented by 1. That is, if the transmitting terminal determines that it has not received HARQ feedback during the PSFCH reception phase associated with the PSSCH transmission on a carrier associated with a certain unicast connection, the first variable is updated, for example, by incrementing its value by 1. When the transmitting terminal determines that it has not received HARQ feedback during the PSFCH reception phase associated with the PSSCH transmission on another carrier associated with the unicast connection, the first variable is updated again, and so on.

[0102] Optionally, in one implementation, since each carrier corresponds to a different HARQ entity, the DTX count on each carrier can be counted separately by the different HARQ entities corresponding to each carrier. Alternatively, in another implementation, the MAC (Media Access Control) entity of the transmitting terminal can count the DTX count on each carrier.

[0103] As an example, for this unicast connection, the transmitting terminal counts whether a DTX has occurred at each PSFCH reception time associated with each PSSCH transmission on all carriers associated with the unicast connection. If no HARQ feedback is detected at the PSFCH reception time, it is determined that a DTX has occurred at the PSFCH reception time, and the transmitting terminal updates the first variable corresponding to the unicast connection, for example, by incrementing the first variable corresponding to the unicast connection by 1. Optionally, for this unicast connection, if the transmitting terminal detects HARQ feedback at a PSFCH reception time associated with a PSSCH transmission on any carrier associated with the unicast connection, it determines that the first variable is reset to 0. In one implementation, if the transmitting terminal detects HARQ feedback at a PSFCH reception time associated with any PSSCH transmission on any carrier associated with the unicast connection, the transmitting terminal can reset the first variable to 0.

[0104] For example, taking the unicast connection associated with carrier 1 and carrier 2 as an example, for this unicast connection, if the transmitting terminal does not detect HARQ feedback when receiving the PSFCH associated with the PSSCH transmitted on carrier 1, the transmitting terminal increments the first variable by 1. If the transmitting terminal does not detect HARQ feedback when receiving the PSFCH associated with the PSSCH transmitted on carrier 2, the transmitting terminal increments the first variable by 1 again. If the transmitting terminal does not detect HARQ feedback when receiving the PSFCH associated with the PSSCH transmitted on carrier 1, the transmitting terminal increments the first variable by 1. If the transmitting terminal detects HARQ feedback when receiving the PSFCH associated with the PSSCH transmitted on carrier 2, the transmitting terminal resets the first variable to 0.

[0105] As another example, for this unicast connection, if the transmitting terminal does not detect HARQ feedback at the first PSFCH reception timing (e.g., the PSFCH reception timing associated with the PSSCH transmitted on carrier 1), the transmitting terminal increments the first variable by 1. If the transmitting terminal does not detect HARQ feedback at the second PSFCH reception timing (e.g., the PSFCH reception timing associated with the PSSCH transmitted on carrier 2), where the second PSFCH reception timing is the next PSFCH reception timing after the first PSFCH reception timing, and the second PSFCH reception timing and the first PSFCH reception timing may belong to the same carrier or different carriers, the transmitting terminal increments the first variable by 1 again. Optionally, if the transmitting terminal does not detect HARQ feedback at the first PSFCH reception timing, the transmitting terminal increments the first variable by 1; if HARQ feedback is detected at the second PSFCH reception timing, the transmitting terminal resets the first variable to 0.

[0106] It should be noted that, in the embodiments of this disclosure, the sending terminal initializes the first variable corresponding to the unicast connection to 0 when the unicast connection is established. Alternatively, the sending terminal initializes the first variable corresponding to the unicast connection to 0 when the first threshold associated with the first variable is reconfigured. Or, the sending terminal initializes the first variable corresponding to the unicast connection to 0 when the first threshold associated with the first variable is initially configured. Here, the initial configuration can be understood as the network device configuring the first threshold for the sending terminal for the first time.

[0107] In step 303, if the first variable is greater than or equal to the first threshold, then it is determined that the unicast connection triggers SL RLF.

[0108] In the embodiments of this disclosure, if the first variable associated with the unicast connection is greater than or equal to a first threshold, the sending terminal considers that the unicast connection has experienced a SL RLF based on HARQ feedback. The MAC layer of the sending terminal can notify the RRC layer of the sending terminal to send the unicast connection triggering the SL RLF. 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.

[0109] In other words, if the transmitting terminal detects that it has not received HARQ feedback during the PSFCH reception, it counts that a DTX has occurred. In this embodiment of the disclosure, the number of consecutive DTXs on all carriers associated with the unicast connection can be counted using 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 during the PSFCH reception associated with the PSSCH transmission on any carrier among all carriers associated with the unicast connection, the first variable is incremented by 1. When the number of consecutive times no HARQ feedback is received on all carriers associated with the unicast connection is greater than or equal to a first threshold, that is, when the first variable is greater than or equal to the first threshold, it can be determined that the unicast connection has triggered SL RLF.

[0110] It should be noted that the detection of "whether HARQ feedback is received" mentioned in this disclosure is based on the timing of PSFCH reception. That is, it checks whether HARQ feedback is received at the reception timing of the PSFCH on a carrier that needs to be received. PSFCHs on different carriers may be interleaved, depending on which carrier the scheduled PSSCH is on. For example, if the scheduled PSSCH is on carrier 1, it checks whether HARQ feedback is received at the reception timing of the PSFCH associated with that PSSCH on carrier 1. If no HARQ feedback is received at the reception timing of the PSFCH associated with that PSSCH on carrier 1, the first variable is incremented by 1.

[0111] Optionally, in some embodiments of this disclosure, the sending terminal can obtain the first threshold through first configuration information; the first threshold is configured at the terminal granularity (per UE). As an example, the first configuration information may be configuration information sent to the sending terminal by the network device, or it may be pre-configured information. That is, the sending terminal can obtain the first threshold from the network device's configuration or pre-configuration.

[0112] For example, a transmitting terminal in RRC connected state can obtain the first threshold through dedicated signaling; a transmitting terminal in RRC IDLE / INACTIVE state can obtain the first threshold through SIB (System Information Block); and a transmitting terminal in OOC (Out of coverage) state can obtain the first threshold through pre-configuration.

[0113] In this embodiment of the disclosure, the transmitting terminal and the receiving terminal communicate via a sidelink through multiple carriers, and the transmitting terminal can maintain the same DTX detection variable (i.e., the first variable mentioned above) 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 the sidelink carrier aggregation scenario, and enabling the RLF mechanism to be supported in the carrier aggregation scenario of sidelink communication.

[0114] It should be noted that in some embodiments of this disclosure, a unicast connection is established between the transmitting terminal and the receiving terminal. The transmitting terminal can independently maintain a second variable for each carrier associated with the unicast connection. This second variable is used to count the number of consecutive DTX events for the unicast connection on the carrier corresponding to the second variable. Maintaining the second variable by the transmitting terminal can be understood as the transmitting terminal managing the second variable. For example, the transmitting terminal can initialize the second variable to 0, reset it to 0, or increment it by 1. That is, if the transmitting terminal and the receiving terminal communicate via multiple carriers through a sidelink, the transmitting terminal counts the number of DTX events for each carrier associated with this unicast connection. Optionally, the transmitting terminal maintains a consecutive DTX detection variable (as described above) for each carrier associated with the unicast connection. This second variable is used to count the number of consecutive DTX events for this unicast connection on the carrier corresponding to the second variable. For details, please refer to [link to relevant documentation]. Figure 4 , Figure 4 This is a flowchart of another side-link wireless link failure detection method provided in this disclosure embodiment. It should be noted that this method is executed by the transmitting terminal. Figure 4 As shown, the method may include, but is not limited to, the following steps.

[0115] In step 401, for the unicast connection, it is determined whether the transmitting terminal received HARQ feedback at the time of receiving the PSFCH associated with the PSSCH transmission on the first carrier.

[0116] In the embodiments disclosed herein, the first carrier is any one of the multiple carriers associated with the unicast connection. The unicast connection is a unicast connection between a transmitting terminal and a receiving terminal, and this unicast connection is associated with multiple carriers. That is, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers; in other words, the transmitting terminal and the receiving terminal are configured with carrier aggregation, and the transmitting terminal and the receiving terminal communicate via the sidelink through multiple carriers. The transmitting terminal counts the number of consecutive DTX events for each carrier associated with this 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. This second variable is used to count the number of consecutive DTX events for this unicast connection on the carrier corresponding to the second variable. In this way, for the unicast connection, the transmitting terminal can determine whether it received HARQ feedback at the time of receiving PSFCH associated with PSSCH transmission on different carriers associated with the unicast connection, so as to determine whether the unicast connection has triggered SL RLF based on whether the transmitting terminal received HARQ feedback at the time of receiving PSFCH associated with PSSCH transmission on different carriers associated with the unicast connection, and the second variable associated with each of the different carriers associated with the unicast connection.

[0117] In step 402, for the unicast connection, it is determined whether to update the second variable associated with the first carrier based on whether the transmitting terminal receives HARQ feedback at the time of receiving the PSFCH associated with the PSSCH transmission on the first carrier.

[0118] In one possible implementation, the first carrier is any one of the multiple carriers associated with the unicast connection. For this unicast connection, if the transmitting terminal does not receive HARQ feedback during the PSFCH reception timing associated with the PSSCH transmission on the first carrier associated with the unicast connection, then the second variable associated with the first carrier is incremented by 1. Optionally, for this unicast connection, if the transmitting terminal does not receive HARQ feedback during the PSFCH reception timing associated with the 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 incremented by 1.

[0119] As an example, the transmitting terminal counts the number of consecutive DTXs on each carrier associated with the unicast connection. For instance, each carrier corresponds to a different HARQ entity, and the DTX count on each carrier can be counted separately by the different HARQ entities corresponding to each carrier. Optionally, the transmitting terminal counts whether HARQ feedback is received at each PSFCH reception time associated with each PSSCH transmission on each carrier, i.e., whether DTX has occurred. If no HARQ feedback is detected at the PSFCH reception time associated with the PSSCH transmission on a certain carrier, the transmitting terminal increments the second variable corresponding to that carrier by 1.

[0120] For example, taking the unicast connection associated with carrier 1 and carrier 2 as an example, for this unicast connection, if the transmitting terminal does not detect HARQ feedback when receiving the PSFCH associated with the PSSCH transmitted on carrier 1, the transmitting terminal will increment the second variable corresponding to carrier 1 by 1. If the transmitting terminal does not detect HARQ feedback when receiving the PSFCH associated with the PSSCH transmitted on carrier 2, the transmitting terminal will increment the second variable corresponding to carrier 2 by 1.

[0121] In step 403, when the second variable associated with each of the carriers associated with the unicast connection is greater than or equal to the second threshold, it is determined that the unicast connection triggers SL RLF.

[0122] In one implementation, if the second variable associated with each of the different carriers is greater than or equal to the second threshold, the transmitting terminal considers that the unicast connection has experienced a HARQ-based SL RLF, i.e., it determines that the unicast connection has triggered an SL RLF. In other words, if the second variable associated with any carrier is greater than or equal to the second threshold, the transmitting terminal considers that carrier has experienced a HARQ-based SL RLF. The "carrier experiencing a HARQ-based SL RLF" described in this invention refers to a state where the second variable associated with the carrier reaches the maximum threshold. It may have other naming forms, such as "carrier radio link failure," etc., and this disclosure does not specifically limit it. The MAC layer of the transmitting terminal can notify the RRC layer of the transmitting terminal that the carrier has experienced a HARQ-based SL RLF. When the second variable associated with all carriers is greater than or equal to the second threshold, the transmitting terminal considers that the unicast connection has experienced a HARQ-based SL RLF, and the MAC layer of the transmitting terminal can notify the RRC layer of the transmitting terminal that the unicast connection has experienced a HARQ-based SL RLF. The RRC layer releases the unicast connection so that the sending terminal and the receiving terminal can re-establish the unicast connection and ensure normal communication.

[0123] In some embodiments of this disclosure, for the unicast connection, if the transmitting terminal receives HARQ feedback during the PSFCH reception timing associated with the PSSCH transmission on any carrier associated with the unicast connection, it determines that the second variable associated with that carrier is reset to 0. That is, for the unicast connection, if the transmitting terminal detects HARQ feedback during the PSFCH reception timing associated with the PSSCH transmission on any carrier associated with the unicast connection, the transmitting terminal resets the second variable associated with that carrier to 0.

[0124] It should be noted that, in the embodiments of this 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.

[0125] In one implementation, if the second threshold is configured at the terminal level (per UE), the transmitting terminal initializes the second variable corresponding to each carrier to 0 during the second threshold reconfiguration or initial configuration. This initial configuration can be understood as the network device configuring the second threshold for the transmitting terminal for the first time. Alternatively, in another implementation, if the second threshold is configured at the carrier level (per carrier), the transmitting terminal initializes the second variable corresponding to a carrier to 0 during the initial configuration or reconfiguration of the second threshold for that carrier. This initial configuration can be understood as the network device configuring the second threshold for that carrier for the first time.

[0126] In one possible implementation, if the second threshold is configured per carrier granularity, the number of second variables associated with the carrier is greater than or equal to the number of second thresholds associated with the carrier. For example, a unicast connection supports three carriers (e.g., carrier 1, carrier 2, and carrier 3), with second variables corresponding to each of the three carriers being second variable 1, second variable 2, and second variable 3, respectively. If the second threshold is configured per carrier granularity, the number of second thresholds can be three (e.g., second threshold a, second threshold b, and third threshold c). 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 example, a unicast connection supports three carriers (e.g., carrier 1, carrier 2, and carrier 3). The second variables corresponding to each of these three carriers are second variable 1, second variable 2, and second variable 3, respectively. If the second threshold is configured at the carrier granularity (per carrier), then the number of second thresholds can be two (e.g., second threshold a and second threshold b). 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 a. Alternatively, a unicast connection supports three carriers (e.g., carrier 1, carrier 2, and carrier 3). The second variables corresponding to each of these three carriers are second variable 1, second variable 2, and second variable 3, respectively. If the second threshold is configured at the carrier granularity (per carrier), then the number of second thresholds can be one (e.g., second threshold a). 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 a, and the threshold corresponding to carrier 3 / second variable 3 is second threshold a.

[0127] Optionally, in some embodiments of this disclosure, the sending terminal can obtain the second threshold through second configuration information. As an example, the second configuration information may be configuration information sent to the sending terminal by the network device, or it may be pre-configured information. That is, the sending terminal can obtain the second threshold from the network device's configuration or pre-configuration.

[0128] For example, a transmitting terminal in RRC connected state can obtain the second threshold through dedicated signaling, a transmitting terminal in RRC IDLE / INACTIVE state can obtain the second threshold through SIB, and a transmitting terminal in OOC state can obtain the second threshold through pre-configuration.

[0129] Optionally, in some embodiments of this disclosure, if it is determined that the second variable corresponding to any carrier is greater than or equal to a second threshold, and the allocation method of the terminal-side downlink transmission resources is a second allocation method, then the transmitting terminal triggers resource reselection and / or carrier reselection; the second allocation method is a method in which the transmitting terminal autonomously selects transmission resources. Wherein, 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 carrier granularity (per carrier), then the second variable corresponding to any carrier is greater than or equal to the second threshold, specifically meaning that the second variable corresponding to any carrier is greater than or equal to the second threshold associated with that carrier.

[0130] For example, if a transmitting terminal in the second allocation mode (such as mode 2 above) detects that a second variable associated with a carrier of 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 that reselected carrier. In other words, the transmitting terminal does not perform SL transmission on carriers where the associated second variable is greater than or equal to the second threshold. Instead, the transmitting terminal reselects a carrier and further reselects resources on the reselected carrier. The second variable associated with the reselected carrier is less than the second threshold (i.e., the second threshold is not reached), or the second variable associated with the reselected carrier is less than or equal to a third threshold, which is less than the second threshold. This SL transmission includes, but is not limited to, at least one of the following: PSSCH transmission, PSCCH transmission, PSFCH transmission, etc. For example, the reselected carrier may need to meet other conditions in some related technologies, including but not limited to CBR, etc. This invention does not specifically limit these conditions and will not elaborate further. That is, in addition to meeting other conditions in some related technologies, the reselected carrier in this disclosure also needs to consider the impact of DTX based on HARQ feedback. The example of CBR is only for the convenience of those skilled in the art and cannot be considered a specific limitation of this disclosure. In other words, the reselected carrier, in addition to considering the impact of DTX based on HARQ feedback, may also need to meet other conditions in some related technologies, which will not be elaborated further here.

[0131] It should be noted that in some embodiments of this disclosure, the transmitting terminal can obtain the third threshold through third configuration information. For example, the third threshold is configured at the terminal level. As an example, the third configuration information can be configuration information sent to the transmitting terminal by the network device, or it can be pre-configured information. That is, the transmitting terminal can obtain the third threshold from the network device's configuration or pre-configuration. For instance, a transmitting terminal in RRC connected state can obtain the third threshold through dedicated signaling, a transmitting terminal in RRC IDLE / INACTIVE state can obtain the third threshold through SIB, and a transmitting terminal in OOC (Out of coverage) state can obtain the third threshold through pre-configuration.

[0132] Optionally, in some embodiments of this disclosure, if the second variable is greater than or equal to the second threshold, the transmitting terminal sends first information to the network device. This first information indicates that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. The "carrier generating a HARQ-based SL RLF" described in this invention refers to a state where the carrier-associated second variable reaches its maximum threshold; other naming conventions are possible, such as "carrier radio link failure," etc., which are not specifically limited in this disclosure. The transmitting terminal is in an RRC connection state. For example, if a transmitting terminal in a first allocation mode (such as mode 1 above) and / or a second allocation mode (such as mode 2 above) connection state detects that at least one carrier-associated second variable is greater than or equal to the second threshold, the transmitting terminal can report this to the network device. For instance, if a transmitting terminal detects that at least one carrier-associated second variable is greater than or equal to the second threshold, the transmitting terminal sends first information to the network device, indicating that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. For example, the transmitting terminal triggers a HARQ-based SL RLF report (which may have other naming conventions, and is not specifically limited in this disclosure). The “carrier generation based on HARQ feedback SL RLF” described in this invention refers to a state in which the second variable associated with the carrier reaches its maximum threshold. It may have other naming forms, such as “carrier radio link failure”, etc., and this disclosure does not specifically limit it.

[0133] Optionally, in some embodiments of this 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). Or, the transmitting terminal may send the first information to the network device via MAC (Media Access Control) CE (Control Element).

[0134] For example, the transmitting terminal can report to the network device via SUI / UAI / MAC CE to indicate that the second variable associated with a certain carrier is greater than or equal to a second threshold. Optionally, if using SUI / UAI, a carrier identifier can be carried, which indicates to the network device that the second variable associated with the carrier corresponding to that carrier identifier is greater than or equal to the second threshold. If using MAC CE, a bitmap can be used, where each bit 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 instance, a value of 1 for the i-th bit indicates that the second variable associated with the carrier associated with carrier identifier i is greater than or equal to the second threshold, while a value of 0 for the i-th bit indicates that the second variable associated with the carrier associated with carrier identifier i has not reached the second threshold, i.e., the second variable associated with the carrier associated with carrier identifier i is less than the second threshold. For example, if the value of the i-th bit is 0, it means that the second variable associated with the carrier identifier i is greater than or equal to the second threshold. If the value of the i-th bit is 1, it means that the second variable associated with the carrier identifier i has not reached the second threshold, that is, the second variable associated with the carrier identifier i is less than the second threshold. This disclosure does not limit this.

[0135] In other words, if the transmitting terminal detects that it has not received HARQ feedback during PSFCH reception, it counts one DTX. In this embodiment, the number of consecutive DTXs on the carrier corresponding to the second variable of the unicast connection can be counted using a 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 that carrier to 0. If the transmitting terminal does not receive HARQ feedback during PSFCH reception associated with PSSCH transmission on any carrier associated with the unicast connection, the second variable corresponding to that carrier is incremented by 1. When the second variable corresponding to that carrier is greater than or equal to a second threshold, it is determined that the carrier has triggered an SL RLF based on HARQ feedback. The "carrier triggering an SL RLF based on HARQ feedback" described in this invention refers to a state where the second variable associated with the carrier reaches the maximum threshold. There may be other naming forms, such as "carrier radio link failure," etc., which are not specifically limited in this disclosure. When the second variables corresponding to 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 an SL RLF.

[0136] 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, it checks whether HARQ feedback is received at the reception timing of the PSFCH on a carrier that needs to be received. The PSFCHs on different carriers may be interleaved, depending on which carrier the scheduled PSSCH is on. For example, if the scheduled PSSCH is on carrier 1, it checks whether HARQ feedback is received at the reception timing of the PSFCH associated with that PSSCH on carrier 1. If no HARQ feedback is received at the reception timing of the PSFCH associated with that PSSCH on carrier 1, the second variable corresponding to carrier 1 is incremented by 1. Similarly, if the scheduled PSSCH is on carrier 2, it checks whether HARQ feedback is received at the reception timing of the PSFCH associated with that PSSCH on carrier 2. If no HARQ feedback is received at the reception timing of the PSFCH associated with that PSSCH on carrier 2, the second variable corresponding to carrier 2 is incremented by 1.

[0137] In this embodiment of the disclosure, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, and the transmitting terminal can maintain its own DTX detection variable (i.e. the second variable mentioned above) on different carriers for each unicast connection. In this way, when the second variable associated with all carriers reaches 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 side-link carrier aggregation scenario, and enabling the RLF mechanism to be supported in the carrier aggregation scenario of side-link communication.

[0138] It is understood that the above embodiments describe the implementation of the side-link wireless link failure detection method of this disclosure from the perspective of the terminal device (i.e., the aforementioned transmitting terminal). This disclosure also proposes another side-link wireless link failure detection method, the implementation of which will be described from the perspective of the network device. Please refer to... Figure 5 , Figure 5 This is a flowchart of another method for detecting wireless link failure in a side-link according to an embodiment of this disclosure. It should be noted that this method is executed by a network device. Figure 5 As shown, the method may include, but is not limited to, the following steps.

[0139] In step 501, the first configuration information is sent to the sending terminal.

[0140] In the embodiments of this disclosure, the first configuration information includes a first threshold associated with a first variable. The transmitting terminal maintains one of the first variables for each unicast connection. The unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink. The unicast connection supports multiple carriers, and the transmitting terminal and the receiving terminal communicate via these multiple carriers through the sidelink. The multiple carriers are associated with the unicast connection, and the first variable is used to count the number of consecutive DTXs (Direct Transaction) of the unicast connection on these multiple carriers. The first variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink SL (Short Link Failure) RLF (Ranging Link Failure). For the description of the first variable and the implementation method of the transmitting terminal determining whether the unicast connection triggers a sidelink SL RLF in the embodiments of this disclosure, please refer to the description of the transmitting terminal-side embodiments above, which will not be repeated here.

[0141] In some embodiments of this disclosure, the first threshold can be configured at the terminal level. The implementation of the first threshold can be found in the description of the above-described embodiments on the sending terminal side, and will not be repeated here.

[0142] In this embodiment of the 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 first variable mentioned above) on all carriers for each unicast connection. In this way, the network device can configure a first threshold for 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. This can solve the problem of how to effectively detect RLF in the side-link carrier aggregation scenario, and enable the RLF mechanism to be supported in the carrier aggregation scenario of side-link communication.

[0143] This disclosure also proposes another method for detecting wireless link failures on a side-link, and the implementation of this method will be described from the network device side. Please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a flowchart of another method for detecting wireless link failure in a side-link according to an embodiment of this disclosure. It should be noted that this method is executed by a network device. Figure 6 As shown, the method may include, but is not limited to, the following steps.

[0144] In step 601, the second configuration information is sent to the sending terminal.

[0145] In the embodiments of this disclosure, the transmitting terminal and the receiving terminal establish a unicast connection on the sidelink. This unicast connection supports multiple carriers, and the transmitting terminal and the receiving terminal communicate via these multiple carriers. The multiple carriers are associated with the unicast connection. The second configuration information includes a second threshold associated with a second variable. The transmitting terminal independently maintains a second variable for each carrier. This second variable is used to count the number of consecutive and discontinuous DTX transmissions by the unicast connection on the carrier corresponding to the second variable. This second variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink SL radio link failure (RLF). For the 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) in the embodiments of this disclosure, please refer to the description of the transmitting terminal-side embodiments above, which will not be repeated here.

[0146] In some embodiments of this disclosure, the second threshold is configured at the terminal granularity. In other embodiments, the second threshold is configured at the carrier granularity. The implementation of the second threshold can be found in the description of the above-described embodiments on the transmitting terminal side, and will not be repeated here.

[0147] Optionally, in some embodiments of this disclosure, the network device may send third configuration information to the transmitting terminal. This third configuration information includes a third threshold, which is less than the second threshold. The third threshold is used by the transmitting terminal to reselect the carrier. The allocation method for the downlink transmission resources on the transmitting terminal side is a second allocation method, whereby the transmitting terminal autonomously selects the transmission resources. The implementation of the third threshold can be found in the description of the above-described embodiments on the transmitting terminal side, and will not be repeated here.

[0148] Optionally, in some embodiments of this disclosure, the network device may receive first information sent by the transmitting terminal, which is used to indicate that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. The "carrier generation based on HARQ feedback SL RLF" described in this invention refers to a state where the second variable associated with the carrier reaches a maximum threshold, and may have other naming forms, such as "carrier radio link failure," etc., which are not specifically limited in this disclosure. In one implementation, the network device may receive the first information sent by the transmitting terminal via SUI; or, the network device may receive the first information sent by the transmitting terminal via UAI; or, the network device may receive the first information sent by the transmitting terminal via MACCE. The implementation of the first information can be found in the description of the above-described embodiments on the transmitting terminal side, and will not be repeated here.

[0149] In this embodiment of the disclosure, the unicast connection between the transmitting terminal and the receiving terminal supports multiple carriers, and the transmitting terminal can maintain its own DTX detection variable (i.e., the second variable mentioned above) on different carriers for each unicast connection. In this way, the network device can configure a second threshold for the second variable for the transmitting terminal, so that when the transmitting terminal determines that the second variable associated with all carriers reaches the second threshold, it determines that the unicast connection has triggered SL RLF. This can solve the problem of how to effectively detect RLF in the side-link carrier aggregation scenario, and enable the RLF mechanism to be supported in the carrier aggregation scenario of side-link communication.

[0150] In the embodiments provided above, the methods provided by the present disclosure have been described from the perspectives of network devices and terminal devices (such as the aforementioned transmitting terminal). To implement the functions of the methods provided in the embodiments of the present disclosure, the network device and the terminal device may include hardware structures and software modules, implementing the aforementioned functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. One of the aforementioned functions can be executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules.

[0151] Please see Figure 7 This is a schematic diagram of the structure of a communication device 70 provided in an embodiment of this disclosure. Figure 7 The communication device 70 shown 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 the sending function, and the receiving module is used to implement the receiving function. The transceiver module 701 can implement both sending and / or receiving functions.

[0152] The communication device 70 can be a wireless link failure detection device for a side link. For example, the communication device 70 can be a terminal device (such as the transmitting terminal in the aforementioned method embodiments), a device within a terminal device, or a device compatible with a terminal device. Alternatively, the communication device 70 can be a network device, a device within a network device, or a device compatible with a network device.

[0153] The communication device 70 is a terminal device (such as the transmitting terminal in the aforementioned method embodiment): a processing module 702 is used to determine the reception status of the Hybrid Automatic Repeat Request (HARQ) feedback on the Physical Side Link Feedback Channel (PSFCH); the processing module 702 is also used to determine whether the unicast connection triggers a Side Link 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 by the transmitting terminal and the receiving terminal on the side link, and the transmitting terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0154] In one implementation, the transmitting terminal maintains a first variable for each unicast connection, which is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers.

[0155] In one possible implementation, the processing module 702 is specifically configured to: for the unicast connection, determine whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the Physical Side Line Shared Channel (PSSCH) transmission on any of the plurality of 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 received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any of the plurality of carriers; if the first variable is greater than or equal to a first threshold, determine that the unicast connection triggers SL RLF.

[0156] 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 the time of receiving the PSFCH associated with the PSSCH transmission on any of the plurality of carriers, increment the first variable by 1.

[0157] In one implementation, the processing module 702 is further configured to: for the unicast connection, if HARQ feedback is detected at the time of PSFCH reception associated with PSSCH transmission on any of the plurality of carriers, then determine that the first variable is reset to 0.

[0158] In one implementation, the processing module 702 is further configured to: obtain the first threshold through first configuration information; the first threshold is configured according to terminal granularity.

[0159] In one implementation, the transmitting terminal maintains a second variable independently for each carrier, which is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable.

[0160] In one possible implementation, processing module 702 is specifically configured to: for the unicast connection, determine whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on the first carrier, where the first carrier is any one of the plurality of carriers associated with the unicast connection. Processing module 702 is specifically configured to: for the unicast connection, determine whether to update the second variable associated with the first carrier based on whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on the first carrier; if the second variable associated with each of the carriers associated with the unicast connection is greater than or equal to a second threshold, then determine that the unicast connection triggers SL RLF.

[0161] In one possible implementation, the processing module 702 is further configured to: obtain the second threshold through second configuration information, wherein the second threshold is configured according to terminal granularity.

[0162] 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 the time of receiving the PSFCH associated with the PSSCH transmission on the first carrier, then determine that the second variable associated with the first carrier is incremented by 1.

[0163] In one possible implementation, the processing module 702 is further configured to: for the unicast connection, if the transmitting terminal receives HARQ feedback at the time of receiving PSFCH associated with PSSCH transmission on the first carrier, then determine that the second variable associated with the first carrier is reset to 0.

[0164] In one possible implementation, the processing module 702 is further configured to: determine that the second variable corresponding to the first carrier is greater than or equal to the second threshold, and that the allocation method of the terminal-side downlink transmission resources is the second allocation method, then trigger resource reselection and / or carrier reselection; the second allocation method is a method in which the transmitting terminal autonomously selects transmission resources. Wherein, 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.

[0165] In one possible implementation, the processing module 702 is further configured to: obtain the third threshold through third configuration information, wherein the third threshold is configured according to terminal granularity.

[0166] In one possible implementation, the transceiver module 701 is configured to: when the second variable is greater than or equal to the second threshold, send first information to the network device, the first information indicating that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. The "carrier generation based on HARQ feedback SL RLF" described in this invention refers to a state where the second variable associated with the carrier reaches its maximum threshold; it may have other naming forms, such as "carrier radio link failure," etc., and this disclosure does not specifically limit it; wherein, the transmitting terminal is in a Radio Resource Control (RRC) connected state.

[0167] In one possible implementation, the transceiver module 701 is specifically used to: send first information to the network device via sidelink terminal information (SUI); or, send first information to the network device via terminal auxiliary information (UAI); or, send first information to the network device via media access control (MAC) control unit (CE).

[0168] The communication device 70 is a network device: a transceiver module 701, used to send first configuration information to a transmitting terminal; wherein, the first configuration information includes a first threshold associated with a first variable, the transmitting terminal maintains one of the first variables for each unicast connection, the unicast connection being a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal communicating via a sidelink through multiple carriers, the multiple carriers being associated with the unicast connection, the first variable being used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein, the first variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink SL radio link failure (RLF).

[0169] In one implementation, the first threshold is configured at the terminal granularity.

[0170] The communication device 70 is a network device: a transceiver module 701, used to send second configuration information to a transmitting terminal; wherein, the transmitting terminal and the receiving terminal establish a unicast connection on a sidelink, and the transmitting terminal and the receiving terminal communicate on the sidelink through multiple carriers, the multiple carriers being 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, the second variable being 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 at the terminal granularity.

[0171] In one implementation: the transceiver module 701 is further configured to: send third configuration information to the transmitting terminal, the third configuration information including a third threshold, the third threshold being less than the second threshold, and the third threshold being used by the transmitting terminal to reselect the carrier, wherein the allocation method of the transmitting terminal's link transmission resources is a second allocation method, the second allocation method being a method in which the transmitting terminal autonomously selects transmission resources.

[0172] In one implementation: the transceiver module 701 is further configured to: receive first information sent by the transmitting terminal, the first information being used to indicate that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. The "carrier generation based on HARQ feedback SL RLF" described in this invention refers to a state where the second variable associated with the carrier reaches a maximum threshold, and may have other naming forms, such as "carrier radio link failure," etc., which are not specifically limited in this disclosure.

[0173] In one possible implementation, the transceiver module 701 is specifically used to: receive first information sent by the transmitting terminal via the sidelink terminal information (SUI); or, receive first information sent by the transmitting terminal via the terminal auxiliary information (UAI); or, receive first information sent by the transmitting terminal via the media access control (MAC) control unit (CE).

[0174] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0175] Please see Figure 8 , Figure 8 This is a schematic diagram of another communication device 80 provided in this embodiment. The communication device 80 can be a network device, a terminal device (such as the sending terminal in the foregoing method embodiments), a chip, chip system, or processor that supports the network device in implementing the above methods, or a chip, chip system, or processor that supports the terminal device in implementing the above methods. This device can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0176] The communication device 80 may include one or more processors 801. The processor 801 may be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control the communication device (e.g., base station, baseband chip, terminal equipment, terminal equipment chip, DU or CU, etc.), execute computer programs, and process data from the computer programs.

[0177] Optionally, the communication device 80 may further include one or more memories 802, which may store a computer program 804. The processor 801 executes the computer program 804 to cause the communication device 80 to perform the methods described in the above method embodiments. Optionally, the memory 802 may also store data. The communication device 80 and the memory 802 may be provided separately or integrated together.

[0178] Optionally, the communication device 80 may also include a transceiver 805 and an antenna 806. The transceiver 805 may be referred to as a transceiver unit, transceiver, or transceiver circuit, etc., and is used to implement the transmission and reception functions. The transceiver 805 may include a receiver and a transmitter. The receiver may be referred to as a receiver or receiving circuit, etc., and is used to implement the receiving function; the transmitter may be referred to as a transmitter or transmitting circuit, etc., and is used to implement the transmitting function.

[0179] Optionally, the communication device 80 may further include one or more interface circuits 807. The interface circuits 807 are used to receive code instructions and transmit them to the processor 801. The processor 801 executes the code instructions to cause the communication device 80 to perform the methods described in the above method embodiments.

[0180] 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 Figure 2 Steps 201 and 202 in the process; execute Figure 3 Steps 301, 302, and 303 in the text; Figure 4 Steps 401, 402, and 403 in the process.

[0181] Communication device 80 is a network device: transceiver 805 is used to perform... Figure 5 Step 501 in the middle; or execute Figure 6 Step 601 in the process.

[0182] In one implementation, the processor 801 may include a transceiver for implementing receive and transmit 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 receive and transmit functions may be separate or integrated. The aforementioned transceiver circuit, interface, or interface circuit can be used for reading and writing code / data, or it can be used for transmitting or relaying signals.

[0183] In one implementation, processor 801 may store a computer program that runs on processor 801, causing communication device 80 to perform the methods described in the above method embodiments. The computer program may be embedded in processor 801; in this case, processor 801 may be implemented in hardware.

[0184] In one implementation, the communication device 80 may include circuitry capable of performing the functions of transmitting, receiving, or communicating as described in the foregoing method embodiments. The processor and transceiver described in this disclosure can be implemented on integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductors (CMOS), n-metal-oxide-semiconductor (NMOS), positive channel metal oxide semiconductors (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0185] The communication device described in the above embodiments may be a network device or a terminal device (such as the sending terminal in the foregoing method embodiments), but the scope of the communication device described in this disclosure is not limited thereto, and the structure of the communication device may vary. Figure 8 The communication device may be a standalone device or part of a larger device. For example, the communication device may be:

[0186] (1) Independent integrated circuit IC, or chip, or chip system or subsystem;

[0187] (2) A collection of one or more ICs, optionally including storage components for storing data and computer programs;

[0188] (3) ASIC, such as modem;

[0189] (4) Modules that can be embedded in other devices;

[0190] (5) Receivers, terminal equipment, smart terminal equipment, cellular phones, wireless equipment, handheld devices, mobile units, vehicle-mounted equipment, network equipment, cloud equipment, artificial intelligence equipment, etc.

[0191] (6) Others, etc.

[0192] For cases where the communication device can be a chip or a chip system, please refer to [link / reference]. Figure 9 The diagram shows the structure of the chip. Figure 9 The chip shown includes a processor 901 and an interface 902. There can be one or more processors 901, and multiple interfaces 902.

[0193] For cases where the chip is used to implement the functions of the terminal device (such as the transmitting terminal in the foregoing method embodiments) in the embodiments of this disclosure:

[0194] Processor 901 is configured to determine the reception status of Hybrid Automatic Repeat Request (HARQ) feedback on the Physical Side Link Feedback Channel (PSFCH); processor 901 is further configured to determine, based on the reception status of the HARQ feedback on the PSFCH, whether the unicast connection triggers a Side Link SL Radio Link Failure (RLF); wherein the unicast connection is a unicast connection established between the transmitting terminal and the receiving terminal on the side link, the transmitting terminal and the receiving terminal communicating on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection.

[0195] In one implementation, the transmitting terminal maintains a first variable for each unicast connection, which is used to count the number of consecutive DTXs of the unicast connection on the multiple carriers.

[0196] In one possible implementation, processor 901 is specifically configured to: for the unicast connection, determine whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the Physical Side Line Shared Channel (PSSCH) transmission on any of the plurality of carriers. Processor 901 is specifically configured to: for the unicast connection, determine whether to update the first variable based on whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on any of the plurality of carriers; if the first variable is greater than or equal to a first threshold, determine that the unicast connection triggers SL RLF.

[0197] 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 the time of receiving the PSFCH associated with the PSSCH transmission on any of the plurality of carriers, increment the first variable by 1.

[0198] In one implementation, the processor 901 is further configured to: for the unicast connection, if HARQ feedback is detected at the time of PSFCH reception associated with PSSCH transmission on any of the plurality of carriers, determine that the first variable is reset to 0.

[0199] In one implementation, the processor 901 is further configured to: obtain the first threshold through first configuration information; the first threshold is configured according to terminal granularity.

[0200] In one implementation, the transmitting terminal maintains a second variable independently for each carrier, which is used to count the number of consecutive DTXs of the unicast connection on the carrier corresponding to the second variable.

[0201] In one possible implementation, processor 901 is specifically configured to: for the unicast connection, determine whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on the first carrier, where the first carrier is any one of the plurality of carriers associated with the unicast connection. Processor 901 is specifically configured to: for the unicast connection, determine whether to update the second variable associated with the first carrier based on whether the transmitting terminal received HARQ feedback at the PSFCH reception timing associated with the PSSCH transmission on the first carrier; if the second variable associated with each of the carriers associated with the unicast connection is greater than or equal to a second threshold, then determine that the unicast connection triggers SL RLF.

[0202] In one possible implementation, the processor 901 is further configured to: obtain the second threshold through second configuration information, the second threshold being configured at the terminal granularity.

[0203] In one implementation, the processor 901 is specifically configured to: for the unicast connection, if the transmitting terminal does not receive HARQ feedback at the time of receiving the PSFCH associated with the PSSCH transmission on the first carrier, then determine that the second variable associated with the first carrier is incremented by 1.

[0204] In one possible implementation, the processor 901 is further configured to: for the unicast connection, if the transmitting terminal receives HARQ feedback at the time of receiving PSFCH associated with PSSCH transmission on the first carrier, then determine that the second variable associated with the carrier is reset to 0.

[0205] In one possible implementation, the processor 901 is further configured to: determine that the second variable corresponding to the first carrier is greater than or equal to the second threshold, and that the allocation method of the terminal-side downlink transmission resources is the second allocation method, then trigger resource reselection and / or carrier reselection; the second allocation method is a method in which the transmitting terminal autonomously selects transmission resources. Wherein, 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.

[0206] In one possible implementation, the processor 901 is further configured to: obtain the third threshold through third configuration information, the third threshold being configured at the terminal granularity.

[0207] In one possible implementation, 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, the first information indicating that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. The "carrier generation based on HARQ feedback SL RLF" described in this invention refers to a state where the second variable associated with the carrier reaches its maximum threshold; it may have other naming forms, such as "carrier radio link failure," etc., and this disclosure does not specifically limit it; wherein, the transmitting terminal is in a Radio Resource Control (RRC) connected state.

[0208] In one possible implementation, interface 902 is specifically used to: send first information to the network device via sidelink terminal information (SUI); or, send first information to the network device via terminal auxiliary information (UAI); or, send first information to the network device via media access control (MAC) control unit (CE).

[0209] For cases where the chip is used to implement the functions of the network device in the embodiments of this disclosure:

[0210] Interface 902 is used to send first configuration information to a transmitting terminal; wherein, the first configuration information includes a first threshold associated with a first variable, the transmitting terminal maintains one of the first variables for each unicast connection, the unicast connection being a unicast connection established between the transmitting terminal and the receiving terminal on a sidelink, the transmitting terminal and the receiving terminal communicating on a sidelink through multiple carriers, the multiple carriers being associated with the unicast connection, the first variable being used to count the number of consecutive DTXs of the unicast connection on the multiple carriers; wherein, the first variable is used by the transmitting terminal to determine whether the unicast connection triggers a sidelink SL radio link failure (RLF).

[0211] In one implementation, the first threshold is configured at the terminal granularity.

[0212] For cases where the chip is used to implement the functions of the network device in the embodiments of this disclosure:

[0213] Interface 902 is used to send second configuration information to a transmitting terminal. The transmitting terminal and the receiving terminal establish a unicast connection on a sidelink, and the transmitting terminal and the receiving terminal communicate via multiple carriers associated with the unicast connection. The second configuration information includes a second threshold associated with a second variable. The transmitting terminal independently maintains a second variable for each carrier, and this second variable is used to count the number of consecutive DTXs (Direct Transaction Trace) on the carrier corresponding to the second variable. This 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 at the terminal granularity.

[0214] In one implementation: interface 902 is further configured to: send third configuration information to the transmitting terminal, the third configuration information including a third threshold, the third threshold being less than the second threshold, and the third threshold being used by the transmitting terminal to reselect the carrier, wherein the allocation method of the transmitting terminal's link transmission resources is a second allocation method, the second allocation method being a method in which the transmitting terminal autonomously selects transmission resources.

[0215] In one implementation: interface 902 is further configured to: receive first information sent by the transmitting terminal, the first information being used to indicate that the carrier corresponding to the second variable has generated a HARQ-based SL RLF. The "carrier generation based on HARQ feedback SL RLF" described in this invention refers to a state where the second variable associated with the carrier reaches a maximum threshold, and may have other naming forms, such as "carrier radio link failure," etc., which are not specifically limited in this disclosure.

[0216] In one possible implementation, interface 902 is specifically used to: receive first information sent by the transmitting terminal via sidelink terminal information (SUI); or, receive first information sent by the transmitting terminal via terminal auxiliary information (UAI); or, receive first information sent by the transmitting terminal via media access control (MAC) control unit (CE).

[0217] Optionally, the chip also includes a memory 903, which is used to store necessary computer programs and data.

[0218] Those skilled in the art will also understand that the various illustrative logical blocks and steps listed in the embodiments of this disclosure can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented in hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functionality using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of this disclosure.

[0219] This disclosure also provides a sidelink wireless link failure detection system, which includes the aforementioned Figure 7 The embodiments include a communication device as a terminal device (such as the sending terminal in the aforementioned method embodiments) and a communication device as a network device; or, the system includes the aforementioned... Figure 8 The embodiments include a communication device as a terminal device (such as the sending terminal in the aforementioned method embodiments) and a communication device as a network device.

[0220] This 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 for the transmitting terminal side. The network device can be configured to implement the method described in any of the above embodiments for the network device side.

[0221] This disclosure also provides a readable storage medium having instructions stored thereon that, when executed by a computer, implement the functions of any of the above method embodiments.

[0222] This disclosure also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.

[0223] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as 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 this 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 transferred from one computer-readable storage medium to another. For example, the computer program can be transferred from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0224] Those skilled in the art will understand that the various numerical designations such as "first," "second," etc., used in this disclosure are merely for the convenience of description and are not intended to limit the scope of the embodiments of this disclosure, nor do they indicate the order of events.

[0225] At least one of the features described in this disclosure can also be described as one or more, and multiple features can be two, three, four or more, and this disclosure does not impose any limitations. In the embodiments of this disclosure, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", etc., and there is no sequential order or size order among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0226] The correspondences shown in the tables of this disclosure can be configured or predefined. The values ​​of the information in each table are merely examples and can be configured to other values; this disclosure is not limiting. When configuring the correspondences between information and parameters, it is not necessarily required to configure all the correspondences shown in each table. For example, the correspondences shown in some rows of the tables in this disclosure may not be configured. Furthermore, appropriate modifications and adjustments can be made based on the above tables, such as splitting, merging, etc. The names of the parameters shown in the headers of the above tables can also use other names that the communication device can understand, and the values ​​or representations of the parameters can also be other values ​​or representations that the communication device can understand. In the implementation of the above tables, other data structures can 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.

[0227] The predefined terms in this disclosure can be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0228] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art 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.

[0229] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0230] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for detecting wireless link failure in a side-link, characterized in that, The method is executed by the sending terminal, and the method includes: For a unicast connection, it is determined whether the transmitting terminal receives a Hybrid Automatic Repeat Request (HARQ) feedback when receiving the Physical Side Link Feedback Channel (PSFCH) associated with the Physical Side Link Shared Channel (PSSCH) transmission on the first carrier. The first carrier is any one of the multiple carriers associated with the unicast connection. The transmitting terminal maintains an independent variable for each carrier. The variable is used to count the number of consecutive and discontinuous DTX transmissions of the unicast connection on the carrier corresponding to the variable. For the unicast connection, it is determined whether to update the variable associated with the first carrier based on whether the transmitting terminal receives HARQ feedback at the time of receiving the PSFCH associated with the PSSCH transmission on the first carrier; If the variables associated with each of the carriers associated with the unicast connection are greater than or equal to the threshold, the unicast connection is determined to trigger a side-link (SL) radio link failure (RLF). The unicast connection is a unicast connection established by the sending terminal and the receiving terminal on the side link. The sending terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection. The method further includes: If the variable corresponding to the first carrier is determined to be greater than or equal to the threshold, and the allocation method of the terminal-side downlink transmission resources is the method in which the transmitting terminal autonomously selects the transmission resources, then resource reselection and / or carrier reselection are triggered.

2. The method as described in claim 1, characterized in that, The method further includes: The threshold is obtained through configuration information, and the threshold is configured according to terminal granularity.

3. The method as described in claim 1, characterized in that, The step of determining whether to update the 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 includes: For the unicast connection, if the transmitting terminal does not receive HARQ feedback during the PSFCH reception time associated with the PSSCH transmission on the first carrier, then the variable associated with the first carrier is incremented by 1.

4. The method according to any one of claims 1 to 3, characterized in that, The method further includes: For the unicast connection, if the transmitting terminal receives HARQ feedback when receiving the PSFCH associated with the PSSCH transmission on the first carrier, it determines that the variable associated with the first carrier is reset to 0.

5. The method as described in claim 1, characterized in that, The variable corresponding to the reselected carrier is less than the threshold; or, The variable corresponding to the reselected carrier is less than or equal to another threshold, which is less than the first threshold.

6. The method as described in claim 5, characterized in that, The method further includes: The additional threshold is obtained through third configuration information, and the additional threshold is configured according to terminal granularity.

7. The method according to any one of claims 1 to 3, characterized in that, The method further includes: If the variable is greater than or equal to the threshold, a first message is sent to the network device, the first message indicating that the variable associated with the carrier corresponding to the variable is greater than or equal to the threshold; wherein, the sending terminal is in Radio Resource Control (RRC) connected state.

8. The method as described in claim 7, characterized in that, Sending the first information to the network device includes any one of the following: The first information is sent to the network device through the side link terminal information SUI; The terminal auxiliary information (UAI) is used to send the first information to the network device; The Media Access Control (MAC) unit (CE) sends the first information to the network device.

9. A method for detecting wireless link failure in a side-link, characterized in that, The method is performed by a network device, and the method includes: Send configuration information to the sending terminal; among which, The transmitting terminal and the receiving terminal establish a unicast connection on the side link. The transmitting terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection. The configuration information includes a threshold associated with a variable. The transmitting terminal maintains an independent variable for each carrier. The variable is used to count the number of consecutive and discontinuous DTX transmissions of the unicast connection on the carrier corresponding to the variable. The number of transmissions is updated based on whether the transmitting terminal receives Hybrid Automatic Repeat Request (HARQ) feedback when receiving the Physical Side Link Feedback Channel (PSFCH) associated with the Physical Side Link Sharing Channel (PSSCH) transmission on the carrier. The variable is used by the transmitting terminal to determine whether the unicast connection triggers a Side Link Link (SL) Radio Link Failure (RLF). If the variables associated with all carriers associated with the unicast connection are greater than or equal to the threshold, it is determined that the unicast connection triggers an SL RLF. Wherein, the first carrier is any one of the plurality of carriers, and resource reselection and / or carrier reselection are triggered when the variable corresponding to the first carrier is greater than or equal to the threshold and the terminal-side downlink transmission resource allocation method is the method in which the transmitting terminal autonomously selects the transmission resources.

10. The method as described in claim 9, characterized in that, The threshold is configured according to the terminal granularity.

11. The method as described in claim 9, characterized in that, The variable corresponding to the reselected carrier is less than the threshold; or, The method further includes: sending additional configuration information to the transmitting terminal, the additional configuration information including an additional threshold, the additional threshold being less than the threshold, and the variable corresponding to the reselected carrier being less than the additional threshold.

12. The method as described in claim 9, characterized in that, The method further includes: The system receives first information sent by the transmitting terminal, wherein the first information is used to indicate that the variable associated with the carrier corresponding to the variable is greater than or equal to the threshold.

13. The method as described in claim 12, characterized in that, The receipt of the first information sent by the sending terminal includes any one of the following: Receive the first information sent by the sending terminal through the side link terminal information SUI; Receive the first information sent by the sending terminal via Terminal Assist Information (UAI); The first information sent by the transmitting terminal through the Media Access Control (MAC) control unit (CE) is received.

14. A wireless link failure detection device for a side-link, characterized in that, The device includes: The processing module is used to determine, for a unicast connection, whether the transmitting terminal receives Hybrid Automatic Repeat Request (HARQ) feedback when receiving the Physical Side Link Feedback Channel (PSFCH) associated with the Physical Side Link Shared Channel (PSSCH) transmission on the first carrier. The first carrier is any one of the multiple carriers associated with the unicast connection. The transmitting terminal maintains an independent variable for each carrier, and the variable is used to count the number of consecutive and discontinuous DTX transmissions of the unicast connection on the carrier corresponding to the variable. The processing module is further configured to, for the unicast connection, determine whether to update the 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; and determine that the unicast connection triggers a side-link SL radio link failure (RLF) if the variables associated with each of the carriers associated with the unicast connection are greater than or equal to a threshold. The unicast connection is a unicast connection established between the device and the receiving terminal on the side link. The device and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection. The processing module is further configured to determine that the variable corresponding to the first carrier is greater than or equal to the threshold, and the allocation method of the terminal-side downlink transmission resources is the method in which the transmitting terminal autonomously selects the transmission resources, and then trigger resource reselection and / or carrier reselection.

15. A wireless link failure detection device for a side-link, characterized in that, The device includes: The transceiver module is used to send configuration information to the sending terminal; among which, The transmitting terminal and the receiving terminal establish a unicast connection on the side link. The transmitting terminal and the receiving terminal communicate on the side link through multiple carriers, and the multiple carriers are associated with the unicast connection. The configuration information includes a threshold associated with a variable. The transmitting terminal maintains an independent variable for each carrier. The variable is used to count the number of consecutive and discontinuous DTX transmissions of the unicast connection on the carrier corresponding to the variable. The number of transmissions is updated based on whether the transmitting terminal receives Hybrid Automatic Repeat Request (HARQ) feedback when receiving the Physical Side Link Feedback Channel (PSFCH) associated with the Physical Side Link Sharing Channel (PSSCH) transmission on the carrier. The variable is used by the transmitting terminal to determine whether the unicast connection triggers a Side Link Link (SL) Radio Link Failure (RLF). If the variables associated with all carriers associated with the unicast connection are greater than or equal to the threshold, it is determined that the unicast connection triggers an SL RLF. Wherein, the first carrier is any one of the plurality of carriers, and resource reselection and / or carrier reselection are triggered when the variable corresponding to the first carrier is greater than or equal to the threshold and the terminal-side downlink transmission resource allocation method is the method in which the transmitting terminal autonomously selects the transmission resources.

16. A communication device, characterized in that, The device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method as described in any one of claims 1 to 8.

17. A communication device, characterized in that, The device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method as described in claim 9 or 13.

18. A communication system, characterized in that, include: A terminal device is configured to implement the method as described in any one of claims 1 to 8; A network device is configured to implement the method as described in any one of claims 9 to 13.

19. A computer-readable storage medium for storing instructions that, when executed, cause the method of any one of claims 1 to 8 to be implemented.

20. A computer-readable storage medium for storing instructions that, when executed, cause the method of any one of claims 9 to 13 to be implemented.

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