DTX counting method based on SL HARQ feedback and terminal

Abstract

The invention relates to a DTX counting method based on SL HARQ feedback and a terminal, and the method comprises the steps that the terminal determines carriers supporting the SL HARQ feedback in aggregated carriers; and carrying out DTX counting based on HARQ feedback on the carrier supporting the SL HARQ feedback. Therefore, the terminal performs the DTX counting based on the HARQ feedback on the carrier supporting the SL HARQ feedback in the aggregated carrier, and does not perform the DTX counting based on the HARQ feedback on the carrier not supporting the SL HARQ feedback, so that the detection of the SL HARQ feedback on the carrier not supporting the SL HARQ feedback can be reduced, and resources are saved.

Description

DTX counting method and terminal based on SL HARQ feedback

[0001] The present disclosure relates to the field of communication technology, and in particular to a counting method and a terminal for discontinuous transmission (DTX) based on sidelink hybrid automatic repeat request (SL HARQ) feedback.

[0002] In order to meet the requirements of single-user peak rate and system capacity improvement, the system transmission bandwidth can be increased, such as by using carrier aggregation (CA). SL communication can use carrier aggregation.

[0003]

[0004] The method disclosed in the present invention can be used to solve the technical problem of "how to perform HARQ-based DTX counting in the case of supporting cross-carrier SL HARQ feedback".

[0005] The disclosed embodiments propose a DTX counting method and terminal based on SL HARQ feedback.

[0006] According to a first aspect of an embodiment of the present disclosure, a DTX counting method based on SL HARQ feedback is proposed, including:

[0007] The terminal determines a carrier that supports SL HARQ feedback in the aggregated carriers;

[0008] A DTX count based on the HARQ feedback is performed on the carrier supporting the SL HARQ feedback.

[0009] According to a second aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0010] The processing module is used to determine a carrier supporting SL HARQ feedback in the aggregated carrier; and perform DTX counting based on HARQ feedback on the carrier supporting SL HARQ feedback.

[0011] According to a third aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0012] one or more processors;

[0013] The terminal is used to execute the method described in the embodiment of the first aspect.

[0014] According to a fourth aspect of an embodiment of the present disclosure, a communication system is proposed, including a terminal and a network device connected to the terminal, wherein the terminal is configured to implement the method described in the embodiment of the first aspect.

[0015] According to a fifth aspect of an embodiment of the present disclosure, a storage medium is proposed, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the DTX counting method based on HARQ feedback as described in the first aspect.

[0016] In the disclosed embodiment of the present invention, the terminal performs DTX counting based on HARQ feedback for the carriers in the aggregated carriers that support SL HARQ feedback, and does not perform DTX counting based on HARQ feedback for the carriers that do not support SL HARQ feedback, thereby reducing the detection of SL HARQ feedback on the carriers that do not support SL HARQ feedback and saving resources.

[0017] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure;

[0019] FIG2 is an interactive schematic diagram of a DTX counting method based on SL HARQ feedback according to an embodiment of the present disclosure;

[0020] 3A-3E are schematic flow diagrams of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure;

[0021] FIG4 is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure;

[0022] FIG5 is an interactive schematic diagram of a DTX counting method based on SL HARQ feedback according to an embodiment of the present disclosure;

[0023] FIG6A is a schematic diagram of the structure of a terminal provided in an embodiment of the present disclosure;

[0024] FIG6B is a schematic diagram of the structure of a terminal provided in an embodiment of the present disclosure;

[0025] FIG7A is a schematic diagram of the structure of a communication device provided in an embodiment of the present disclosure;

[0026] FIG. 7B is a schematic diagram of the structure of a chip proposed in an embodiment of the present disclosure.

[0027] The disclosed embodiments propose a DTX counting method and terminal based on SL HARQ feedback.

[0028] In a first aspect, an embodiment of the present disclosure proposes a method for counting discontinuous reception DTX based on SL HARQ feedback, including:

[0029] The terminal determines a carrier that supports SL HARQ feedback in the aggregated carriers;

[0030] A DTX count based on the HARQ feedback is performed on the carrier supporting the SL HARQ feedback.

[0031] In the above embodiment, the terminal performs DTX counting based on HARQ feedback for the carriers that support SL HARQ feedback in the aggregated carriers, and does not perform DTX counting based on HARQ feedback for the carriers that do not support SL HARQ feedback, thereby reducing the detection of SL HARQ feedback on the carriers that do not support SL HARQ feedback and saving resources.

[0032] In combination with some embodiments of the first aspect, in some embodiments, determining a carrier in the aggregated carrier that supports SL HARQ feedback includes at least one of the following:

[0033] The SL HARQ feedback corresponding to the physical sidelink shared channel (PSSCH) on the first carrier of the aggregated carrier is transmitted on the second carrier, and the second carrier is determined as the carrier supporting the SL HARQ feedback;

[0034] The SL HARQ feedback corresponding to the PSSCH on the third carrier in the aggregated carriers is transmitted on the third carrier, and the third carrier is determined to be the carrier supporting the SL HARQ feedback.

[0035] In the above embodiment, if the SL HARQ feedback corresponding to the PSSCH on the first carrier is transmitted on the second carrier, and the SL HARQ feedback corresponding to the PSSCH on the third carrier is transmitted on the third carrier, it can be determined that the second carrier and the third carrier are carriers supporting SL HARQ feedback, thereby performing DTX counting based on HARQ feedback for the carriers that support cross-carrier SL HARQ feedback and the carriers that do not support cross-carrier SL HARQ feedback in the aggregated carriers.

[0036] In combination with some embodiments of the first aspect, in some embodiments, the performing DTX counting based on HARQ feedback on the carrier supporting SL HARQ feedback includes:

[0037] For the first unicast connection, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier is transmitted on the second carrier, and the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on the second carrier; wherein the first unicast connection is any unicast connection established by the terminal;

[0038] If no SL HARQ feedback of the PSSCH is detected at the PSFCH timing, a DTX count based on HARQ feedback corresponding to the second carrier associated with the first unicast connection is increased by 1;

[0039] The SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity, and the DTX count based on the HARQ feedback corresponding to the second carrier associated with the first unicast connection is reinitialized to 0.

[0040] In the above embodiment, for any unicast connection, if the SL HARQ feedback corresponding to the PSSCH associated with the unicast connection on the first carrier is transmitted on the second carrier, the SL HARQ feedback of the PSSCH can be detected when the PSFCH corresponding to the PSSCH associated with the first unicast connection on the second carrier is detected, so as to perform DTX counting based on the HARQ feedback for the second carrier associated with the first unicast connection, thereby improving the accuracy of the DTX counting based on the HARQ feedback.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0042] The first unicast connection of the terminal establishes or enables carrier aggregation, and initializes the DTX count based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection to 0, wherein the first unicast connection is any unicast connection established by the terminal.

[0043] In the above embodiment, when any unicast connection of the terminal is established or carrier aggregation is enabled, the DTX count based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the unicast connection can be initialized to 0, thereby improving the accuracy of the DTX count based on HARQ feedback.

[0044] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0045] Receive configuration information sent by network devices;

[0046] According to the configuration information, a preset threshold associated with the carrier supporting SL HARQ feedback is acquired.

[0047] In the above embodiment, the terminal may obtain the preset threshold value of the carrier association supporting SL HARQ feedback from the configuration of the network device, thereby configuring according to actual needs, thereby improving the flexibility of configuration.

[0048] In combination with some embodiments of the first aspect, in some embodiments, receiving configuration information sent by a network device includes any of the following:

[0049] receiving the configuration information sent by the network device through dedicated signaling, wherein the terminal is in a radio resource control (RRC) connected state;

[0050] The configuration information is received by the network device through a system information block (SIB) message, wherein the terminal is in an RRC idle state or an RRC sleep state.

[0051] In the above embodiment, terminals in different states can obtain the preset threshold value configured by the network device for the carrier supporting SL HARQ feedback for the terminal in different ways, which has a wide application range.

[0052] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0053] The preset threshold associated with the carrier supporting SL HARQ feedback is obtained through pre-configuration.

[0054] In the above embodiment, the preset threshold associated with the carrier supporting SL HARQ feedback can be obtained according to the pre-configuration, which enriches the flexibility of obtaining the preset threshold.

[0055] In combination with some embodiments of the first aspect, in some embodiments, acquiring, according to the configuration information, a preset threshold associated with the carrier supporting SL HARQ feedback includes:

[0056] Acquire a preset threshold corresponding to the terminal in the configuration information, and determine the corresponding preset threshold as the preset threshold associated with the carrier supporting SL HARQ feedback.

[0057] In the above embodiment, the preset threshold configured by the network device at the terminal granularity can be determined as the preset threshold associated with the carrier supporting SL HARQ feedback. Configuring the preset threshold at the terminal granularity is simple and convenient.

[0058] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes at least one of the following:

[0059] The preset threshold value corresponding to the terminal is initially configured, and the DTX count of the HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the terminal is initialized to 0;

[0060] The preset threshold corresponding to the terminal is reconfigured, and the DTX count of the HARQ feedback corresponding to the preset threshold associated with the carrier supporting SL HARQ feedback associated with the first unicast connection is reinitialized to 0.

[0061] In the above embodiment, when the preset threshold corresponding to the terminal is initially configured, the DTX count of HARQ feedback corresponding to any carrier supporting SL HARQ feedback associated with any unicast connection can be initialized to 0. When the preset threshold corresponding to the terminal is reconfigured, the DTX count of HARQ feedback corresponding to the preset threshold associated with any carrier supporting SL HARQ feedback associated with any unicast connection can be reinitialized to 0, thereby improving the accuracy of the DTX count of HARQ feedback.

[0062] In combination with some embodiments of the first aspect, in some embodiments, acquiring, according to the configuration information, a preset threshold associated with the carrier supporting SL HARQ feedback includes:

[0063] Acquire the preset threshold corresponding to the carrier supporting SL HARQ feedback in the configuration information, and determine the corresponding preset threshold as the preset threshold associated with the carrier supporting SL HARQ feedback.

[0064] In the above embodiment, the preset threshold associated with the carrier supporting SL HARQ feedback can be obtained according to the preset threshold configured by the network device with carrier granularity, and the preset threshold can be configured with carrier granularity, so that different preset thresholds can be configured for different carriers supporting SL HARQ feedback as needed, thereby meeting different application requirements.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes at least one of the following:

[0066] The preset threshold associated with the fourth carrier in the carrier supporting SL HARQ feedback is initially configured, and the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection of the terminal is initialized to 0; wherein the fourth carrier is any carrier in the carrier supporting SL HARQ feedback associated with the first unicast connection;

[0067] The preset threshold associated with the fourth carrier is reconfigured, and the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection is reinitialized to 0.

[0068] In the above embodiment, when the preset threshold associated with any carrier among the carriers supporting SL HARQ feedback is initially configured, the DTX count of the HARQ feedback corresponding to any unicast connection associated with the carrier can be initialized to 0. When the preset threshold associated with any carrier among the carriers supporting SL HARQ feedback is reconfigured, the DTX count of the HARQ feedback corresponding to any unicast connection associated with the carrier can be reinitialized to 0, thereby improving the accuracy of the DTX count of the HARQ feedback.

[0069] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0070] The DTX count based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the terminal is greater than or equal to the preset threshold associated with the carrier supporting SL HARQ feedback, determining that a sidelink radio link failure (SL RLF) based on HARQ feedback occurs in the first unicast connection.

[0071] In the above embodiment, whether SL RLF based on HARQ feedback occurs in a unicast connection is determined based on whether the DTX count based on HARQ feedback corresponding to a carrier supporting SL HARQ feedback associated with a unicast connection is greater than or equal to a preset threshold associated with the carrier supporting SL HARQ feedback, thereby improving the accuracy of the judgment.

[0072] In conjunction with some embodiments of the first aspect, in some embodiments, the method may further include:

[0073] Notify the RRC layer that a side link SL RLF based on HARQ feedback occurs for the first unicast connection;

[0074] The RRC layer releases the first unicast connection.

[0075] In the above embodiment, when SL RLF based on HARQ feedback occurs in the first unicast connection, the RRC layer is notified, and the RRC layer releases the first unicast connection, thereby improving the accuracy of the sidelink communication.

[0076] In a second aspect, an embodiment of the present disclosure provides a terminal, including:

[0077] The processing module is used to determine a carrier supporting SL HARQ feedback in the aggregated carrier; and perform DTX counting based on HARQ feedback on the carrier supporting SL HARQ feedback.

[0078] In the above embodiment, the terminal performs DTX counting based on HARQ feedback for the carriers that support SL HARQ feedback in the aggregated carriers, and does not perform DTX counting based on HARQ feedback for the carriers that do not support SL HARQ feedback, thereby reducing the detection of SL HARQ feedback on the carriers that do not support SL HARQ feedback and saving resources.

[0079] In a third aspect, an embodiment of the present disclosure proposes a terminal, which includes at least one of a transceiver module and a processing module: wherein the first terminal is used to execute the first aspect and the optional implementation method of the first aspect.

[0080] In a fourth aspect, an embodiment of the present disclosure proposes a terminal, which includes: one or more processors; wherein the terminal is used to execute the first aspect and the optional implementation method of the first aspect.

[0081] In a fifth aspect, an embodiment of the present disclosure proposes a communication system, including a terminal, wherein the terminal is used to execute the method described in the first aspect and the optional implementation manner of the first aspect.

[0082] In a sixth aspect, an embodiment of the present disclosure proposes a communication system, including a terminal and a network device connected to the terminal, wherein the terminal is used to execute the method described in the first aspect and the optional implementation manner of the first aspect.

[0083] In a seventh aspect, an embodiment of the present disclosure proposes a storage medium, wherein the storage medium stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the first aspect and the optional implementation method of the first aspect.

[0084] In an eighth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the first aspect and the optional implementation manner of the first aspect.

[0085] In a ninth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect and the optional implementation manner of the first aspect.

[0086] In a tenth aspect, an embodiment of the present disclosure provides a chip or a chip system. The chip or chip system includes a processing circuit configured to execute the method described in the first aspect and the optional implementation of the first aspect.

[0087] It is understandable that the above-mentioned terminal, communication system, storage medium, program product, computer program, chip or chip system are all used to execute the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method, which will not be repeated here.

[0088] The embodiments of the present disclosure propose a DTX counting method and terminal based on SL HARQ feedback. In some embodiments, the DTX counting method based on SL HARQ feedback and the terms such as information processing method and communication method can be replaced with each other, the terms such as information transmission device and information processing device and communication device can be replaced with each other, and the terms such as information processing system and communication system can be replaced with each other.

[0089] The embodiments of the present disclosure are not exhaustive, but are only illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined, for example, some or all of the steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0090] In each embodiment of the present disclosure, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between the embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment based on their internal logical relationships.

[0091] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0092] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun after the article may be understood as a singular expression or a plural expression.

[0093] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0094] In some embodiments, the terms “at least one,” “one or more,” “a plurality of,” “multiple,” etc. may be used interchangeably.

[0095] In some embodiments, "at least one of A and B", "A and / or B", "A in one case, B in another case", "in response to one case A, in response to another case B", etc., may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). When there are more branches such as A, B, C, etc., the above is also similar.

[0096] In some embodiments, the recording method of "A or B" may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). When there are more branches such as A, B, C, etc., the above is also similar.

[0097] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute restrictions on the position, order, priority, quantity or content of the description objects. The statement of the description object refers to the description in the context of the claims or embodiments, and should not constitute unnecessary restrictions due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields", and the "first" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number, and can be one or more. Taking the "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes may be the same or different. For example, if the description object is "device", then the "first device" and the "second device" may be the same device or different devices, and their types may be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" may be the same information or different information, and their contents may be the same or different.

[0098] In some embodiments, “including A”, “comprising A”, “used to indicate A”, and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0099] In some embodiments, terms such as "in response to ...", "in response to determining ...", "in the case of ...", "at the time of ...", "when ...", "if ...", "if ...", etc. can be used interchangeably.

[0100] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0101] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station (radio base station)", "fixed station (fixed station)", "node (node)", "access point (access point)", "transmission point (TP)", "reception point (reception point, RP)", "transmission / reception point (transmission / reception point, TRP)", "panel (panel)", "antenna panel (antenna panel)", "antenna array (antenna array)", "cell (cell)", "macro cell (macro cell)", "small cell (small cell)", "femto cell (femto cell)", "pico cell (pico cell)", "sector (sector)", "cell group (cell)", "carrier (carrier)", "component carrier (component carrier)", "bandwidth part (bandwidth part, BWP)" and the like can be used interchangeably.

[0102] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client and the like may be used interchangeably.

[0103] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the access network device, the core network device, or the network device and the communication between the terminals is replaced by the communication between multiple terminals (for example, it can also be referred to as device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the terminal has all or part of the functions of the access network device. In addition, the language such as "uplink" and "downlink" can also be replaced by the language corresponding to the communication between the terminals (for example, "side"). For example, the uplink channel, the downlink channel, etc. can be replaced by the side channel, and the uplink, the downlink, etc. can be replaced by the side link.

[0104] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may also be configured to have a structure that has all or part of the functions of the terminal.

[0105] In some embodiments, acquisition of data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0106] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0107] FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1 , the communication system 100 may include a first terminal 101, a second terminal 102, and a network device 103. A communication connection may be established between the first terminal 101 and the second terminal 102. SL communication may be performed between the first terminal 101 and the second terminal 102.

[0108] In some embodiments, the first terminal 101 may be connected to the network device 103 .

[0109] In some embodiments, the network device 103 may include at least one of an access network device and a core network device.

[0110] In some embodiments, the first terminal 101 or the second terminal 102 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited to these.

[0111] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a WiFi system, but is not limited thereto.

[0112] In some embodiments, the technical solution of the present disclosure may be applicable to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure may become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs.

[0113] In some embodiments, the access network device may be composed of a centralized unit (central unit, CU) and a distributed unit (distributed unit, DU), wherein the CU may also be referred to as a control unit (control unit). The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, and the DU being centrally controlled by the CU, but not limited to this.

[0114] In some embodiments, the core network device may be a device including one or more network elements, or may be a plurality of devices or a group of devices, each including all or part of one or more network elements. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0115] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. A person of ordinary skill in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0116] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or part of the subject, but are not limited thereto. The subjects shown in FIG1 are examples, and the communication system may include all or part of the subjects in FIG1 , or may include other subjects other than FIG1 , and the number and form of the subjects are arbitrary, and the connection relationship between the subjects is an example, and the subjects may be connected or disconnected, and the connection may be in any manner, which may be a direct connection or an indirect connection, and may be a wired connection or a wireless connection.

[0117] The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine-to-Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), systems using other communication methods, next-generation systems based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G, etc.) for application.

[0118] In order to support direct communication between terminals, the SL communication mode is introduced. Optionally, the interface between the terminals can be PC-5 (direct communication interface).

[0119] In some embodiments, the terms "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" and the like can be used interchangeably.

[0120] Optionally, according to the corresponding relationship between the sending terminal and the receiving terminal, three transmission modes are supported on the SL: unicast, multicast and broadcast.

[0121] Optionally, SL communication has two ways of allocating sending resources, one is the way that the network schedules sending resources, and the other is the way that the terminal autonomously selects sending resources from the network configuration or pre-configured resource pool. Among them, the way that the network schedules sending resources is that the network device dynamically allocates sending resources on the SL to the terminal based on the cached data reported by the terminal, and the way that the terminal autonomously selects sending resources is that the terminal randomly selects sending resources from the network configuration or pre-configured resource pool. Optionally, the network device can configure multiple resource pools for the terminal on one BWP. Optionally, which resource allocation method the terminal uses can be configured by the network device through radio resource control (RRC) signaling.

[0122] In some embodiments, the name of the method for network scheduling to send resources is not limited. For example, the method for network scheduling to send resources may be mode 1 or mode1.

[0123] In some embodiments, the name of the method for autonomously selecting sending resources is not limited. For example, the method for autonomously selecting sending resources may be mode 2 or mode2.

[0124] In some embodiments, both downlink and uplink channel access rely on the listen before talk (LBT) feature. The wireless device or base station must first "sense" the communication channel and find that there is no communication before any transmission. When a communication channel is an unlicensed wideband carrier (e.g., hundreds of megahertz), the LBT process relies on detecting energy levels on multiple sub-bands of the communication channel. Exemplarily, LBT parameters (such as type / duration, clear channel assessment parameters, etc.) can be configured by the base station on the wireless device. In some embodiments, based on the HARQ feedback-based radio link failure (SL RLF) detection mechanism, for a unicast connection, if the terminal does not receive HARQ feedback (DTX) on the physical sidelink feedback channel (PSFCH) resource for a certain number of consecutive times, the terminal can consider that the unicast connection has a SL RLF based on HARQ feedback and notify the RRC layer. RRC controls the SL RLF detection based on HARQ feedback by configuring the maximum number of consecutive DTXs sl-maxNumConsecutiveDTX per UE (each terminal). At the same time, the terminal maintains a numConsecutiveDTX variable for each unicast connection, which is used to count the number of consecutive DTXs for this unicast connection. When the unicast connection is established or sl-maxNumConsecutiveDTX is reconfigured or initially configured, the terminal initializes the variable numConsecutiveDTX corresponding to the unicast connection to 0. The terminal counts whether there is DTX for each PSFCH reception opportunity associated with each physical sidelink shared channel (PSSCH) transmission of this unicast connection. If no HARQ feedback is received on the PSFCH opportunity, the terminal adds 1 to the variable numConsecutiveDTX corresponding to the unicast connection. When the numConsecutiveDTX variable corresponding to the unicast connection reaches the maximum value sl-maxNumConsecutiveDTX, the terminal considers that the unicast connection has an SL RLF based on HARQ feedback and notifies the RRC layer. If the terminal receives HARQ feedback on the PSFCH opportunity, the terminal initializes the variable numConsecutiveDTX corresponding to the unicast connection to 0. Exemplarily, sl-maxNumConsecutiveDTX can be configured as 1 at the minimum and 32 at the maximum.

[0125] In some embodiments, one carrier may correspond to one HARQ entity.

[0126] In some embodiments, in a carrier aggregation scenario, DTX based on HARQ feedback may be counted at a carrier granularity, and the terminal does not trigger SL RLF even if the DTX count based on HARQ feedback of one or more carriers reaches a maximum value, but the terminal device has other carriers available.

[0127] In some embodiments, cross-carrier SL HARQ feedback may refer to a physical sidelink control channel (PSCCH) and / or PSSCH being transmitted on carrier A, but PSSCH-associated SL HARQ feedback being transmitted on PSFCH on carrier B.

[0128] In some embodiments, cross-carrier SL HARQ feedback is not supported in a carrier aggregation scenario.

[0129] In some embodiments, cross-carrier SL HARQ feedback may be supported in a carrier aggregation scenario, but the impact of cross-carrier SL HARQ feedback on the carrier-granular HARQ-based DTX count is unclear.

[0130] Based on this, the present disclosure proposes a DTX counting method based on SL HARQ feedback.

[0131] Optionally, in some embodiments, the method of the present disclosure may be applied to a SL CA scenario. For example, in some embodiments, the method of the present disclosure may be applied to a vehicle networking scenario.

[0132] FIG2 is an interactive schematic diagram of a DTX counting method based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG2 , an embodiment of the present disclosure relates to a DTX counting method based on SL HARQ feedback, which is used in a communication system 100, and the method includes:

[0133] Step S2101: The first terminal 101 sends sidelink data to the second terminal 102.

[0134] In some embodiments, terms such as "send", "transmit", "report", "send", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0135] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 , and the second terminal 102 may receive the sidelink data sent by the first terminal 101 .

[0136] In some embodiments, the second terminal 102 may be any terminal that establishes a unicast connection with the first terminal 101 .

[0137] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 via an aggregated carrier.

[0138] In some embodiments, the first terminal 101 can send side link data to the second terminal 102 via the PSSCH on any carrier in the aggregated carrier. After receiving the side link data, the second terminal 102 can provide SL HARQ feedback to the first terminal 101 for the HARQ-enabled PSSCH.

[0139] In some embodiments, the SL HARQ feedback corresponding to the PSSCH on the first carrier in the aggregated carrier can be transmitted on the second carrier. Exemplarily, the SL HARQ feedback corresponding to the PSSCH sent by the first terminal 101 on the first carrier can be transmitted on the second carrier. Exemplarily, the SL HARQ feedback corresponding to the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be transmitted on the second carrier; Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be associated with a unicast service, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be associated with a unicast service corresponding to any unicast connection, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be associated with a multicast service. Exemplarily, the first carrier can be one or more. Exemplarily, the second carrier can be one or more.

[0140] In some embodiments, the SL HARQ feedback corresponding to the PSSCH on the third carrier in the aggregated carrier is transmitted on the third carrier. Exemplarily, the SL HARQ feedback corresponding to the PSSCH sent by the first terminal 101 on the third carrier is transmitted on the third carrier. Exemplarily, the SL HARQ feedback corresponding to the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier is transmitted on the third carrier; Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier can be associated with a unicast service, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier can be associated with a unicast service corresponding to any unicast connection, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier can be associated with a multicast service. Exemplarily, the third carrier can be one or more.

[0141] For example, the aggregated carriers of the first terminal 101 include carriers A1, A2, A3, A4, A5, and A6, wherein the SL HARQ feedback corresponding to the PSSCH on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A3 is transmitted on carriers A2 and A4, the SL HARQ feedback corresponding to the PSSCH on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH on carrier A6 is transmitted on carrier A6. It can be understood that carriers A1 and A3 in the aggregated carrier support cross-carrier SL HARQ feedback, and carriers A2, A4, A5, and A6 do not support cross-carrier SL HARQ feedback. It can be understood that in this embodiment, the cross-carrier SL HARQ feedback is carrier-granular.

[0142] In some embodiments, SL HARQ feedback corresponding to some PSSCH on a carrier may be transmitted on the carrier, and SL HARQ feedback corresponding to some PSSCH may be transmitted on other carriers. Exemplarily, the first terminal 101 indicates whether the SL HARQ feedback of PSSCH is transmitted on other carriers through the sidelink control information (SCI) associated with PSSCH. For example, SL HARQ feedback corresponding to some PSSCH transmitted on carrier a1 is transmitted on carrier a1, and SL HARQ feedback corresponding to some PSSCH transmitted on carrier a1 is transmitted on carrier a2. It can be understood that in this embodiment, the cross-carrier SL HARQ feedback is PSSCH granularity.

[0143] Step S2102: The first terminal 101 performs DTX counting based on HARQ feedback for the carrier supporting SL HARQ feedback.

[0144] In some embodiments, the first terminal 101 may determine a carrier in the aggregated carrier that supports SL HARQ feedback. Exemplarily, the carrier that supports SL HARQ feedback may refer to a carrier that carries SL HARQ feedback. Exemplarily, the carrier that supports SL HARQ feedback may refer to a carrier that does not carry cross-carrier SL HARQ feedback. Exemplarily, for a first unicast connection, a HARQ-based DTX count is performed, and the carrier that supports SL HARQ feedback may refer to a carrier that carries SL HARQ feedback associated with the first unicast connection.

[0145] In some embodiments, the first terminal 101 may determine a carrier in the aggregated carrier that supports SL HARQ feedback according to a carrier used for transmission of SL HARQ feedback corresponding to a PSSCH on each carrier in the aggregated carrier.

[0146] Optionally, if the SL HARQ feedback corresponding to the PSSCH on the first carrier in the aggregated carrier is transmitted on the second carrier, it can be determined that the second carrier is a carrier supporting SL HARQ feedback, and the first carrier is not a carrier supporting SL HARQ feedback. Exemplarily, the first carrier can be one or more. Exemplarily, the second carrier can be one or more.

[0147] Optionally, if the SL HARQ feedback corresponding to the PSSCH on the third carrier in the aggregated carrier is transmitted on the third carrier, it can be determined that the third carrier is a carrier supporting SL HARQ feedback. Exemplarily, the third carrier can be one or more.

[0148] In some embodiments, the first terminal 101 may perform DTX counting based on HARQ feedback for carriers supporting SL HARQ feedback in the aggregated carriers.

[0149] For example, a certain aggregated carrier includes carriers A1, A2, A3, A4, A5, and A6, wherein the SL HARQ feedback corresponding to the PSSCH on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A3 is transmitted on carriers A2 and A4, the SL HARQ feedback corresponding to the PSSCH on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH on carrier A6 is transmitted on carrier A6. It can be determined that carriers A2, A4, A5, and A6 in the aggregated carrier are carriers that support SL HARQ feedback, and then DTX counting based on HARQ feedback can be performed for carriers A2, A4, A5, and A6 respectively.

[0150] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is uploaded on carrier A6. It can be determined that for the first unicast connection, carriers A2, A4, A5, and A6 in the aggregated carriers are carriers that support SL HARQ feedback, so DTX counting based on HARQ feedback can be performed on carriers A2, A4, A5, and A6, respectively.

[0151] In some embodiments, the DTX count based on HARQ feedback may be for a unicast connection, and illustratively, the first terminal 101 performs the DTX count based on HARQ feedback for a first unicast connection. The first unicast connection may be any unicast connection established by the first terminal 101.

[0152] In some embodiments, for the first unicast connection, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier in the aggregated carrier is transmitted on the second carrier, the SL HARQ feedback of the PSSCH can be detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on the second carrier, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier is not detected at the PSFCH timing on the second carrier, the DTX count based on the HARQ feedback corresponding to the second carrier associated with the first unicast connection is increased by 1, and if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier is detected at the PSFCH timing on the second carrier, the DTX count based on the HARQ feedback corresponding to the second carrier associated with the first unicast connection is reinitialized to 0. Exemplarily, the first unicast connection can be any unicast connection of the first terminal 101. Exemplarily, the PSFCH timing can be understood as the time-frequency domain resources of the PSFCH.

[0153] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, and whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A2. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A1 is not detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A1 is detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is reinitialized to 0.

[0154] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4. Whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A2. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A3. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is not detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is reinitialized to 0.

[0155] The PSFCH timing on carrier A4 detects whether SL HARQ feedback is received. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A3. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is not detected at the PSFCH timing on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is detected at the PSFCH timing on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is reinitialized to 0.

[0156] In some embodiments, for the first unicast connection, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the third carrier in the aggregated carrier is transmitted on the third carrier, the SL HARQ feedback of the PSSCH can be detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on the third carrier, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the third carrier is not detected at the PSFCH opportunity on the third carrier, the DTX count based on the HARQ feedback corresponding to the third carrier associated with the first unicast connection is increased by 1, and if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the third carrier is detected at the PSFCH opportunity on the third carrier, the DTX count based on the HARQ feedback corresponding to the third carrier associated with the first unicast connection is reinitialized to 0. Exemplarily, the first unicast connection can be any unicast connection of the first terminal 101. Exemplarily, the PSFCH opportunity can be understood as the time-frequency domain resources of the PSFCH.

[0157] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, and whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A2. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A2. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is not detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is reinitialized to 0.

[0158] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, and whether the SL HARQ feedback is received is detected at the PSFCH opportunity on carrier A4. The PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier A4. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is not detected at the PSFCH opportunity on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is detected at the PSFCH opportunity on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is reinitialized to 0.

[0159] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A5. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A5. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is not detected at the PSFCH timing on carrier A5, the DTX count based on HARQ feedback corresponding to carrier A5 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is detected at the PSFCH timing on carrier A5, the DTX count based on HARQ feedback corresponding to carrier A5 associated with the first unicast connection is reinitialized to 0.

[0160] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is transmitted on carrier A6, and whether the SL HARQ feedback is received is detected at the PSFCH opportunity on carrier A6. The PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier A6. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is not detected at the PSFCH opportunity on carrier A6, the DTX count based on HARQ feedback corresponding to carrier A6 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is detected at the PSFCH opportunity on carrier A6, the DTX count based on HARQ feedback corresponding to carrier A6 associated with the first unicast connection is reinitialized to 0.

[0161] In some embodiments, for the first unicast connection, when HARQ-based DTX counting is performed on the carrier associated with the first unicast connection and supporting SL HARQ feedback, it can be detected whether SL HARQ feedback is received during the PSFCH timing on the carrier supporting SL HARQ feedback. The SL HARQ feedback may include the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on the carrier. If the carrier also transmits SL HARQ feedback associated with the first unicast connection across carriers, then it also includes SL HARQ feedback associated with the first unicast connection across carriers.

[0162] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is uploaded on carrier A6.

[0163] For the first unicast connection, HARQ-based DTX counting is performed on carrier A2. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A2, and the SL HARQ feedback includes SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A1, and / or SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A2, and / or SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A3.

[0164] For the first unicast connection, HARQ-based DTX counting is performed on carrier A4. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A4. The SL HARQ feedback includes the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A3, and / or the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A4.

[0165] For the first unicast connection, HARQ-based DTX counting is performed on carrier A5. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A5. The SL HARQ feedback includes the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A5.

[0166] For the first unicast connection, HARQ-based DTX counting is performed on carrier A6. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A6. The SL HARQ feedback includes the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A6.

[0167] In some embodiments, if SL HARQ feedback corresponding to some PSSCH on a certain carrier can be transmitted on the carrier, and SL HARQ feedback corresponding to some PSSCH can be transmitted on other carriers, HARQ-based DTX counting is performed on the carrier and the other carriers respectively.

[0168] For example, SL HARQ feedback corresponding to some PSSCH transmitted on carrier a1 is transmitted on carrier a1, and SL HARQ feedback corresponding to some PSSCH transmitted on carrier a1 is transmitted on carrier a2. For the first unicast connection, detect whether SL HARQ feedback is received at the PSSCH opportunity on carrier a1, where the PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier a1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is not detected on carrier a1, the HARQ-based DTX count corresponding to the carrier a1 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is detected on carrier a1, the HARQ-based DTX count corresponding to the carrier a1 associated with the first unicast connection is reinitialized to 0; detect whether SL HARQ feedback is received at the PSSCH opportunity on carrier a2, where the PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier a1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is not detected on carrier a2, the HARQ-based DTX count corresponding to the carrier a1 associated with the first unicast connection is reinitialized to 0. HARQ feedback, add 1 to the HARQ-based DTX count corresponding to carrier a2 associated with the first unicast connection. If SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is detected on carrier a2, reinitialize the HARQ-based DTX count corresponding to carrier a2 associated with the first unicast connection to 0.

[0169] In some embodiments, if the first unicast connection of the first terminal 101 establishes or enables carrier aggregation, the DTX counts based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection can be initialized to 0. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0170] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is transmitted on carrier A6. When establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is initialized to 0; when establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0; when establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is initialized to 0; when establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is initialized to 0.

[0171] In some embodiments, the first terminal 101 may receive configuration information sent by the network device 103, and obtain a preset threshold associated with a carrier supporting SL HARQ feedback according to the configuration information. Exemplarily, if there are multiple carriers supporting SL HARQ feedback in the aggregated carrier, a preset threshold associated with each carrier supporting SL HARQ feedback may be obtained.

[0172] For example, the carriers supporting SL HARQ feedback in a certain aggregated carrier are carriers A2, A4, A5, and A6. According to the configuration information, the preset threshold associated with carrier A2, the preset threshold associated with carrier A4, the preset threshold associated with carrier A5, and the preset threshold associated with carrier A6 can be obtained.

[0173] In some embodiments, the first terminal 101 may obtain a preset threshold value associated with a carrier supporting SL HARQ feedback according to a preset threshold value corresponding to the first terminal 101 in the configuration information. Exemplarily, the preset threshold value corresponding to the first terminal 101 in the configuration information may be obtained, and the preset threshold value corresponding to the first terminal 101 may be determined as the preset threshold value associated with a carrier supporting SL HARQ feedback.

[0174] For example, the carriers that support SL HARQ feedback in a certain aggregated carrier are carriers A2, A4, A5, and A6, and the preset threshold corresponding to the first terminal 101 in the configuration information is k1. Then it can be determined that the preset threshold associated with carrier A2 is k1, the preset threshold associated with carrier A4 is k1, the preset threshold associated with carrier A5 is k1, and the preset threshold associated with carrier A6 is k1.

[0175] In some embodiments, the first terminal 101 may obtain a preset threshold associated with a carrier supporting SL HARQ feedback according to a preset threshold corresponding to a carrier supporting SL HARQ feedback in the configuration information. Exemplarily, the preset threshold corresponding to a carrier supporting SL HARQ feedback in the configuration information may be obtained, and the preset threshold corresponding to the carrier supporting SL HARQ feedback may be determined as the preset threshold associated with the carrier supporting SL HARQ feedback. Exemplarily, the preset thresholds associated with different carriers supporting SL HARQ feedback may be the same or different.

[0176] For example, in a certain aggregated carrier, the carriers supporting SL HARQ feedback are carriers A2, A4, A5, and A6. In the configuration information, the preset threshold corresponding to carrier A2 is k1, the preset threshold corresponding to carrier A4 is k2, the preset threshold associated with carrier A5 is k3, and the preset threshold associated with carrier A6 is k4. Then, it can be determined that the preset threshold associated with carrier A2 is k1, the preset threshold associated with carrier A4 is k2, the preset threshold associated with carrier A5 is k3, and the preset threshold associated with carrier A6 is k4. Among them, k1, k2, k3, and k4 can be the same or different.

[0177] In some embodiments, if the first terminal 101 is in an RRC connected state, it can receive configuration information sent by the network device through dedicated signaling, obtain the preset threshold corresponding to the first terminal 101 according to the configuration information, and determine the preset threshold corresponding to the first terminal 101 as the preset threshold associated with the carrier supporting SL HARQ feedback.

[0178] In some embodiments, if the first terminal 101 is in an RRC idle state or an RRC sleep state, it can receive configuration information sent by a network device through a SIB message, and obtain a preset threshold value associated with a carrier supporting SL HARQ feedback according to the configuration information.

[0179] In some embodiments, the first terminal 101 may obtain a preset threshold value of a carrier association supporting SL HARQ feedback through pre-configuration. Exemplarily, if the first terminal 101 is out of coverage (OOC), the preset threshold value of a carrier association supporting SL HARQ feedback may be obtained through pre-configuration.

[0180] In some embodiments, the first terminal 101 may obtain a preset threshold associated with a carrier supporting SL HARQ feedback according to a preset threshold corresponding to the first terminal 101 in a preconfiguration.

[0181] In some embodiments, if the preset threshold corresponding to the first terminal 101 is initially configured, the DTX counts of the HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the first terminal 101 can be initialized to 0. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0182] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold corresponding to the first terminal 101 is initially configured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is initialized to 0, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is initialized to 0, and the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is initialized to 0.

[0183] In some embodiments, if the preset threshold corresponding to the first terminal 101 is reconfigured, the DTX count of the HARQ feedback corresponding to the preset threshold associated with the carrier supporting SL HARQ feedback associated with the first unicast connection can be reinitialized to 0. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0184] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold corresponding to the first terminal 101 is reconfigured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is reinitialized to 0, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is reinitialized to 0, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is reinitialized to 0, and the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is reinitialized to 0.

[0185] In some embodiments, if the preset threshold associated with the fourth carrier in the carrier supporting SL HARQ feedback is initially configured, the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection of the first terminal 101 may be initialized to 0. Exemplarily, the first unicast connection may be any unicast connection established by the first terminal 101. Exemplarily, the fourth carrier may be any carrier in the carrier supporting SL HARQ feedback associated with the first unicast connection.

[0186] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold associated with carrier A2 is initially configured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is initialized to 0; when the preset threshold associated with carrier A4 is initially configured, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0; when the preset threshold associated with carrier A5 is initially configured, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is reinitialized to 0; when the preset threshold associated with carrier A6 is initially configured, the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is initialized to 0.

[0187] In some embodiments, if the fourth carrier association in the carrier supporting SL HARQ feedback is reconfigured, the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection of the first terminal 101 may be reinitialized to 0. Exemplarily, the first unicast connection may be any unicast connection established by the first terminal 101. Exemplarily, the fourth carrier may be any carrier in the carrier supporting SL HARQ feedback associated with the first unicast connection.

[0188] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold associated with carrier A2 is reconfigured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is reinitialized to 0; when the preset threshold associated with carrier A4 is reconfigured, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0; when the preset threshold associated with carrier A5 is reconfigured, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is reinitialized to 0; when the preset threshold associated with carrier A6 is reconfigured, the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is reinitialized to 0.

[0189] In some embodiments, if the DTX counts based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the first terminal 101 are greater than or equal to the preset threshold associated with the carrier supporting SL HARQ feedback, it can be determined that SL RLF based on HARQ feedback occurs in the first unicast connection. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0190] For example, the carriers supporting SL HARQ feedback associated with a unicast connection of the first terminal 101 are A2, A4, A5, and A6. If the DTX count based on HARQ feedback corresponding to carrier A2 is greater than or equal to the preset threshold associated with carrier A2, the DTX count based on HARQ feedback corresponding to carrier A4 is greater than or equal to the preset threshold associated with carrier A4, the DTX count based on HARQ feedback corresponding to carrier A5 is greater than or equal to the preset threshold associated with carrier A5, and the DTX count based on HARQ feedback corresponding to carrier A6 is greater than or equal to the preset threshold associated with carrier A6, it can be determined that SL RLF based on HARQ feedback occurs in the unicast connection.

[0191] In some embodiments, if the first unicast connection has an SL RLF based on HARQ feedback, the RRC layer may be notified that the first unicast connection has an SL RLF based on HARQ feedback, and the RRC layer may release the first unicast connection. Exemplarily, if the media access control (MAC) layer of the first terminal 101 determines that the first unicast connection has an SL RLF based on HARQ feedback, the RRC layer may be notified, and the RRC layer releases the first unicast connection. Exemplarily, the first unicast connection may be any unicast connection established by the first terminal 101.

[0192] The DTX counting method based on SL HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2102. For example, step S2101 may be implemented as an independent embodiment, step S2102 may be implemented as an independent embodiment, and steps S2101 and S2102 may be implemented as independent embodiments, but are not limited thereto.

[0193] In some embodiments, step S2101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0194] In this implementation mode or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other implementation modes or other examples.

[0195] FIG3A is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3A , an embodiment of the present disclosure relates to a method for counting DTX based on SL HARQ feedback, which is used for a first terminal 101, and the method includes:

[0196] Step S3101, sending side link data.

[0197] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

[0198] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102, but is not limited thereto and may also send sidelink data to other entities.

[0199] In some embodiments, the second terminal 102 may be a terminal having a unicast connection with the first terminal 101 .

[0200] Step S3102: Perform DTX counting based on HARQ feedback for the carrier supporting SL HARQ feedback.

[0201] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

[0202] In some embodiments, step S3101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0203] The DTX counting method based on SL HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3102. For example, step S3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, and steps S3101 and S3102 may be implemented as independent embodiments, but are not limited thereto.

[0204] In this implementation manner or example, unless there is any contradiction, each step can be independent, combined arbitrarily or exchanged in order, and the optional methods or optional examples can be combined arbitrarily.

[0205] FIG3B is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3B , an embodiment of the present disclosure relates to a method for counting DTX based on SL HARQ feedback, which is used for a first terminal 101, and the method includes:

[0206] Step S3201: Determine a carrier in the aggregated carrier that supports SL HARQ feedback according to a carrier used for transmission of SL HARQ feedback corresponding to a PSSCH on each carrier in the aggregated carrier.

[0207] The optional implementation of step S3201 can refer to step S2102 of FIG. 2 , the optional implementation of step S3102 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0208] Step S3202: Perform DTX counting based on HARQ feedback for the carrier supporting SL HARQ feedback.

[0209] The optional implementation of step S3202 can refer to step S2102 of FIG. 2 , the optional implementation of step S3102 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0210] The DTX counting method based on SL HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3202. For example, step S3201 may be implemented as an independent embodiment, step S3202 may be implemented as an independent embodiment, and step S3201 and step S3202 may be implemented as independent embodiments, but are not limited thereto.

[0211] In this implementation manner or example, unless there is any contradiction, each step can be independent, combined arbitrarily or exchanged in order, and the optional methods or optional examples can be combined arbitrarily.

[0212] FIG3C is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3C , an embodiment of the present disclosure relates to a method for counting DTX based on SL HARQ feedback, which is used for a first terminal 101, and the method includes:

[0213] Step S3301: SL HARQ feedback corresponding to a physical sidelink shared channel PSSCH on a first carrier in aggregated carriers is transmitted on a second carrier, and the second carrier is determined to be a carrier supporting SL HARQ feedback.

[0214] The optional implementation of step S3301 can refer to step S2102 of FIG. 2 , the optional implementation of step S3102 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0215] Step S3302: SL HARQ feedback corresponding to the PSSCH on a third carrier in the aggregated carriers is transmitted on the third carrier, and the third carrier is determined to be a carrier supporting SL HARQ feedback.

[0216] For optional implementations of step S3302, reference may be made to step S2102 in FIG. 2 , optional implementations of step S3102 in FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0217] Step S3303: Perform DTX counting based on HARQ feedback on the second carrier and the third carrier respectively.

[0218] The optional implementation of step S3303 can refer to step S2102 of FIG. 2 , the optional implementation of step S3102 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0219] The DTX counting method based on SL HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3301 to S3303. For example, step S3301 may be implemented as an independent embodiment, step S3302 may be implemented as an independent embodiment, step S3303 may be implemented as an independent embodiment, step S3303 may be implemented as an independent embodiment, step S3301 and step S3302 may be implemented as independent embodiments, step S3301, step S3302 and step S3303 may be implemented as independent embodiments but are not limited thereto.

[0220] In this implementation manner or example, unless there is any contradiction, each step can be independent, combined arbitrarily or exchanged in order, and the optional methods or optional examples can be combined arbitrarily.

[0221] FIG3D is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3D , an embodiment of the present disclosure relates to a method for counting DTX based on SL HARQ feedback, which is used for a first terminal 101, and the method includes:

[0222] Step S3401: determining a carrier supporting SL HARQ feedback among aggregated carriers associated with a first unicast connection.

[0223] The optional implementation of step S3401 can refer to step S2101 in Figure 2, the optional implementation of step S3101 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0224] Step S3402: Perform DTX counting based on HARQ feedback on the carrier supporting SL HARQ feedback associated with the first unicast connection.

[0225] The optional implementation of step S3402 can refer to step S2101 in FIG. 2 , the optional implementation of step S3101 in FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0226] Step S3403: The DTX counts based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection are greater than or equal to the preset threshold associated with the carrier supporting SL HARQ feedback, and it is determined that SL RLF based on HARQ feedback occurs in the first unicast connection.

[0227] The optional implementation of step S3403 can refer to step S2101 in FIG. 2 , the optional implementation of step S3101 in FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0228] The DTX counting method based on SL HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3401 to S3403. For example, step S3401 may be implemented as an independent embodiment, step S3402 may be implemented as an independent embodiment, step S3403 may be implemented as an independent embodiment, step S3401 and step S3402 may be implemented as independent embodiments, and step S3401, step S3402 and step S3403 may be implemented as independent embodiments but are not limited thereto.

[0229] In this implementation manner or example, unless there is any contradiction, each step can be independent, combined arbitrarily or exchanged in order, and the optional methods or optional examples can be combined arbitrarily.

[0230] FIG3E is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3E , an embodiment of the present disclosure relates to a method for counting DTX based on SL HARQ feedback, which is used for a first terminal 101, and the method includes:

[0231] Step S3501: determine a carrier supporting SL HARQ feedback in aggregated carriers.

[0232] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 , and the second terminal 102 may receive the sidelink data sent by the first terminal 101 .

[0233] In some embodiments, the second terminal 102 may be any terminal that establishes a unicast connection with the first terminal 101 .

[0234] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 via an aggregated carrier.

[0235] In some embodiments, the first terminal 101 can send side link data to the second terminal 102 via the PSSCH on any carrier in the aggregated carrier. After receiving the side link data, the second terminal 102 can provide SL HARQ feedback to the first terminal 101 for the HARQ-enabled PSSCH.

[0236] In some embodiments, the SL HARQ feedback corresponding to the PSSCH on the first carrier in the aggregated carrier can be transmitted on the second carrier. Exemplarily, the SL HARQ feedback corresponding to the PSSCH sent by the first terminal 101 on the first carrier can be transmitted on the second carrier. Exemplarily, the SL HARQ feedback corresponding to the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be transmitted on the second carrier; Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be associated with a unicast service, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be associated with a unicast service corresponding to any unicast connection, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the first carrier can be associated with a multicast service. Exemplarily, the first carrier can be one or more. Exemplarily, the second carrier can be one or more.

[0237] In some embodiments, the SL HARQ feedback corresponding to the PSSCH on the third carrier in the aggregated carrier is transmitted on the third carrier. Exemplarily, the SL HARQ feedback corresponding to the PSSCH sent by the first terminal 101 on the third carrier is transmitted on the third carrier. Exemplarily, the SL HARQ feedback corresponding to the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier is transmitted on the third carrier; Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier can be associated with a unicast service, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier can be associated with a unicast service corresponding to any unicast connection, Exemplarily, the HARQ-enabled PSSCH sent by the first terminal 101 on the third carrier can be associated with a multicast service. Exemplarily, the third carrier can be one or more.

[0238] For example, the aggregated carriers of the first terminal 101 include carriers A1, A2, A3, A4, A5, and A6, wherein the SL HARQ feedback corresponding to the PSSCH on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A3 is transmitted on carriers A2 and A4, the SL HARQ feedback corresponding to the PSSCH on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH on carrier A6 is transmitted on carrier A6. It can be understood that carriers A1 and A3 in the aggregated carrier support cross-carrier SL HARQ feedback, and carriers A2, A4, A5, and A6 do not support cross-carrier SL HARQ feedback. It can be understood that in this embodiment, the cross-carrier SL HARQ feedback is carrier-granular.

[0239] In some embodiments, SL HARQ feedback corresponding to certain PSSCH on a carrier may be transmitted on the carrier, and SL HARQ feedback corresponding to certain PSSCH may be transmitted on other carriers. Exemplarily, the first terminal 101 indicates whether the SL HARQ feedback of PSSCH is transmitted on other carriers through the SCI associated with PSSCH. For example, SL HARQ feedback corresponding to certain PSSCH transmitted on carrier a1 is transmitted on carrier a1, and SL HARQ feedback corresponding to certain PSSCH transmitted on carrier a1 is transmitted on carrier a2. It can be understood that in this embodiment, cross-carrier SL HARQ feedback is PSSCH granularity.

[0240] In some embodiments, the first terminal 101 may determine a carrier in the aggregated carrier that supports SL HARQ feedback. Exemplarily, the carrier that supports SL HARQ feedback may refer to a carrier that carries SL HARQ feedback. Exemplarily, the carrier that supports SL HARQ feedback may refer to a carrier that does not carry cross-carrier SL HARQ feedback. Exemplarily, for a first unicast connection, a HARQ-based DTX count is performed, and the carrier that supports SL HARQ feedback may refer to a carrier that carries SL HARQ feedback associated with the first unicast connection.

[0241] In some embodiments, the first terminal 101 may determine a carrier in the aggregated carrier that supports SL HARQ feedback according to a carrier used for transmission of SL HARQ feedback corresponding to a PSSCH on each carrier in the aggregated carrier.

[0242] Optionally, if the SL HARQ feedback corresponding to the PSSCH on the first carrier in the aggregated carrier is transmitted on the second carrier, it can be determined that the second carrier is a carrier supporting SL HARQ feedback, and the first carrier is not a carrier supporting SL HARQ feedback. Exemplarily, the first carrier can be one or more. Exemplarily, the second carrier can be one or more.

[0243] Optionally, if the SL HARQ feedback corresponding to the PSSCH on the third carrier in the aggregated carrier is transmitted on the third carrier, it can be determined that the third carrier is a carrier supporting SL HARQ feedback. Exemplarily, the third carrier can be one or more.

[0244] Step S3502: Perform DTX counting based on HARQ feedback for the carrier supporting SL HARQ feedback.

[0245] In some embodiments, the first terminal 101 may perform DTX counting based on HARQ feedback for carriers supporting SL HARQ feedback in the aggregated carriers.

[0246] For example, a certain aggregated carrier includes carriers A1, A2, A3, A4, A5, and A6, wherein the SL HARQ feedback corresponding to the PSSCH on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A3 is transmitted on carriers A2 and A4, the SL HARQ feedback corresponding to the PSSCH on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH on carrier A6 is transmitted on carrier A6. It can be determined that carriers A2, A4, A5, and A6 in the aggregated carrier are carriers that support SL HARQ feedback, and then DTX counting based on HARQ feedback can be performed for carriers A2, A4, A5, and A6 respectively.

[0247] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is uploaded on carrier A6. It can be determined that for the first unicast connection, carriers A2, A4, A5, and A6 in the aggregated carriers are carriers that support SL HARQ feedback, so DTX counting based on HARQ feedback can be performed on carriers A2, A4, A5, and A6, respectively.

[0248] In some embodiments, the DTX count based on HARQ feedback may be for a unicast connection, and illustratively, the first terminal 101 performs the DTX count based on HARQ feedback for a first unicast connection. The first unicast connection may be any unicast connection established by the first terminal 101.

[0249] In some embodiments, for the first unicast connection, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier in the aggregated carrier is transmitted on the second carrier, the SL HARQ feedback of the PSSCH can be detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on the second carrier, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier is not detected at the PSFCH timing on the second carrier, the DTX count based on the HARQ feedback corresponding to the second carrier associated with the first unicast connection is increased by 1, and if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier is detected at the PSFCH timing on the second carrier, the DTX count based on the HARQ feedback corresponding to the second carrier associated with the first unicast connection is reinitialized to 0. Exemplarily, the first unicast connection can be any unicast connection of the first terminal 101. Exemplarily, the PSFCH timing can be understood as the time-frequency domain resources of the PSFCH.

[0250] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, and whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A2. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A1 is not detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A1 is detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is reinitialized to 0.

[0251] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4. Whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A2. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A3. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is not detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is reinitialized to 0.

[0252] The PSFCH timing on carrier A4 detects whether SL HARQ feedback is received. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A3. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is not detected at the PSFCH timing on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on carrier A3 is detected at the PSFCH timing on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is reinitialized to 0.

[0253] In some embodiments, for the first unicast connection, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the third carrier in the aggregated carrier is transmitted on the third carrier, the SL HARQ feedback of the PSSCH can be detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on the third carrier, if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the third carrier is not detected at the PSFCH opportunity on the third carrier, the DTX count based on the HARQ feedback corresponding to the third carrier associated with the first unicast connection is increased by 1, and if the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the third carrier is detected at the PSFCH opportunity on the third carrier, the DTX count based on the HARQ feedback corresponding to the third carrier associated with the first unicast connection is reinitialized to 0. Exemplarily, the first unicast connection can be any unicast connection of the first terminal 101. Exemplarily, the PSFCH opportunity can be understood as the time-frequency domain resources of the PSFCH.

[0254] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, and whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A2. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A2. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is not detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is detected at the PSFCH timing on carrier A2, the DTX count based on HARQ feedback corresponding to carrier A2 associated with the first unicast connection is reinitialized to 0.

[0255] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, and whether the SL HARQ feedback is received is detected at the PSFCH opportunity on carrier A4. The PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier A4. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is not detected at the PSFCH opportunity on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is detected at the PSFCH opportunity on carrier A4, the DTX count based on HARQ feedback corresponding to carrier A4 associated with the first unicast connection is reinitialized to 0.

[0256] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and whether the SL HARQ feedback is received is detected at the PSFCH timing on carrier A5. The PSFCH timing refers to the PSFCH timing corresponding to the PSSCH associated with the first unicast connection sent on carrier A5. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is not detected at the PSFCH timing on carrier A5, the DTX count based on HARQ feedback corresponding to carrier A5 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is detected at the PSFCH timing on carrier A5, the DTX count based on HARQ feedback corresponding to carrier A5 associated with the first unicast connection is reinitialized to 0.

[0257] The SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is transmitted on carrier A6, and whether the SL HARQ feedback is received is detected at the PSFCH opportunity on carrier A6. The PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier A6. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is not detected at the PSFCH opportunity on carrier A6, the DTX count based on HARQ feedback corresponding to carrier A6 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is detected at the PSFCH opportunity on carrier A6, the DTX count based on HARQ feedback corresponding to carrier A6 associated with the first unicast connection is reinitialized to 0.

[0258] In some embodiments, for the first unicast connection, when HARQ-based DTX counting is performed on the carrier associated with the first unicast connection and supporting SL HARQ feedback, it can be detected whether SL HARQ feedback is received during the PSFCH timing on the carrier supporting SL HARQ feedback. The SL HARQ feedback may include the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on the carrier. If the carrier also transmits SL HARQ feedback associated with the first unicast connection across carriers, then it also includes SL HARQ feedback associated with the first unicast connection across carriers.

[0259] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is uploaded on carrier A6.

[0260] For the first unicast connection, HARQ-based DTX counting is performed on carrier A2. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A2, and the SL HARQ feedback includes SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A1, and / or SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A2, and / or SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A3.

[0261] For the first unicast connection, HARQ-based DTX counting is performed on carrier A4. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A4. The SL HARQ feedback includes the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A3, and / or the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A4.

[0262] For the first unicast connection, HARQ-based DTX counting is performed on carrier A5. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A5. The SL HARQ feedback includes the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A5.

[0263] For the first unicast connection, HARQ-based DTX counting is performed on carrier A6. Exemplarily, it is possible to detect whether SL HARQ feedback is received during the PSFCH timing on carrier A6. The SL HARQ feedback includes the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection transmitted on carrier A6.

[0264] In some embodiments, if SL HARQ feedback corresponding to some PSSCH on a carrier can be transmitted on the carrier, and SL HARQ feedback corresponding to some PSSCH can be transmitted on other carriers, HARQ-based DTX counts are performed on the carrier and the other carriers respectively.

[0265] For example, SL HARQ feedback corresponding to some PSSCH transmitted on carrier a1 is transmitted on carrier a1, and SL HARQ feedback corresponding to some PSSCH transmitted on carrier a1 is transmitted on carrier a2. For the first unicast connection, detect whether SL HARQ feedback is received at the PSSCH opportunity on carrier a1, where the PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier a1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is not detected on carrier a1, the HARQ-based DTX count corresponding to the carrier a1 associated with the first unicast connection is increased by 1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is detected on carrier a1, the HARQ-based DTX count corresponding to the carrier a1 associated with the first unicast connection is reinitialized to 0; detect whether SL HARQ feedback is received at the PSSCH opportunity on carrier a2, where the PSFCH opportunity refers to the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection sent on carrier a1. If the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is not detected on carrier a2, the HARQ-based DTX count corresponding to the carrier a1 associated with the first unicast connection is reinitialized to 0. HARQ feedback, add 1 to the HARQ-based DTX count corresponding to carrier a2 associated with the first unicast connection. If SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier a1 is detected on carrier a2, reinitialize the HARQ-based DTX count corresponding to carrier a2 associated with the first unicast connection to 0.

[0266] In some embodiments, if the first unicast connection of the first terminal 101 establishes or enables carrier aggregation, the DTX counts based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection can be initialized to 0. Exemplarily, the first unicast connection can be any unicast connection of the first terminal 101.

[0267] For example, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A1 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A3 is transmitted on carrier A2 and carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A2 is transmitted on carrier A2, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A4 is transmitted on carrier A4, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A5 is transmitted on carrier A5, and the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection sent on carrier A6 is transmitted on carrier A6. When establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is initialized to 0; when establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0; when establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is initialized to 0; when establishing the first unicast connection, the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is initialized to 0.

[0268] In some embodiments, the first terminal 101 may receive configuration information sent by the network device 103, and obtain a preset threshold associated with a carrier supporting SL HARQ feedback according to the configuration information. Exemplarily, if there are multiple carriers supporting SL HARQ feedback in the aggregated carrier, a preset threshold associated with each carrier supporting SL HARQ feedback may be obtained.

[0269] For example, the carriers supporting SL HARQ feedback in a certain aggregated carrier are carriers A2, A4, A5, and A6. According to the configuration information, the preset threshold associated with carrier A2, the preset threshold associated with carrier A4, the preset threshold associated with carrier A5, and the preset threshold associated with carrier A6 can be obtained.

[0270] In some embodiments, the first terminal 101 may obtain a preset threshold value associated with a carrier supporting SL HARQ feedback according to a preset threshold value corresponding to the first terminal 101 in the configuration information. Exemplarily, the preset threshold value corresponding to the first terminal 101 in the configuration information may be obtained, and the preset threshold value corresponding to the first terminal 101 may be determined as the preset threshold value associated with a carrier supporting SL HARQ feedback.

[0271] For example, the carriers that support SL HARQ feedback in a certain aggregated carrier are carriers A2, A4, A5, and A6, and the preset threshold corresponding to the first terminal 101 in the configuration information is k1. Then the preset threshold associated with carrier A2 is k1, the preset threshold associated with carrier A4 is k1, the preset threshold associated with carrier A5 is k1, and the preset threshold associated with carrier A6 is k1.

[0272] In some embodiments, the first terminal 101 may obtain a preset threshold associated with a carrier supporting SL HARQ feedback according to a preset threshold corresponding to a carrier supporting SL HARQ feedback in the configuration information. Exemplarily, the preset threshold corresponding to a carrier supporting SL HARQ feedback in the configuration information may be obtained, and the preset threshold corresponding to the carrier supporting SL HARQ feedback may be determined as the preset threshold associated with the carrier supporting SL HARQ feedback. Exemplarily, the preset thresholds associated with different carriers supporting SL HARQ feedback may be the same or different.

[0273] For example, in a certain aggregated carrier, the carriers supporting SL HARQ feedback are carriers A2, A4, A5, and A6. In the configuration information, the preset threshold corresponding to carrier A2 is k1, the preset threshold corresponding to carrier A4 is k2, the preset threshold associated with carrier A5 is k3, and the preset threshold associated with carrier A6 is k4. Then, it can be determined that the preset threshold associated with carrier A2 is k1, the preset threshold associated with carrier A4 is k2, the preset threshold associated with carrier A5 is k3, and the preset threshold associated with carrier A6 is k4. Among them, k1, k2, k3, and k4 can be the same or different.

[0274] In some embodiments, if the first terminal 101 is in an RRC connected state, it can receive configuration information sent by the network device through dedicated signaling, obtain the preset threshold corresponding to the first terminal 101 according to the configuration information, and determine the preset threshold corresponding to the first terminal 101 as the preset threshold associated with the carrier supporting SL HARQ feedback.

[0275] In some embodiments, if the first terminal 101 is in an RRC idle state or an RRC sleep state, it can receive configuration information sent by the network device through a SIB message, and obtain a preset threshold corresponding to the first terminal 101 based on the configuration information, and determine the preset threshold corresponding to the first terminal 101 as the preset threshold associated with the carrier supporting SL HARQ feedback.

[0276] In some embodiments, the first terminal 101 may obtain a preset threshold value of a carrier association supporting SL HARQ feedback through pre-configuration. Exemplarily, if the first terminal 101 is in OOC, the preset threshold value of a carrier association supporting SL HARQ feedback may be obtained through pre-configuration.

[0277] In some embodiments, the first terminal 101 may obtain a preset threshold associated with a carrier supporting SLHARQ feedback based on a preset threshold corresponding to the first terminal 101 in the preconfiguration.

[0278] In some embodiments, if the preset threshold corresponding to the first terminal 101 is initially configured, the DTX counts of the HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the first terminal 101 can be initialized to 0. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0279] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold corresponding to the first terminal 101 is initially configured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is initialized to 0, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is initialized to 0, and the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is initialized to 0.

[0280] In some embodiments, if the preset threshold corresponding to the first terminal 101 is reconfigured, the DTX count of the HARQ feedback corresponding to the preset threshold associated with the carrier supporting SL HARQ feedback associated with the first unicast connection can be reinitialized to 0. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0281] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold corresponding to the first terminal 101 is reconfigured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is reinitialized to 0, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is reinitialized to 0, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is reinitialized to 0, and the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is reinitialized to 0.

[0282] In some embodiments, if the preset threshold associated with the fourth carrier in the carrier supporting SL HARQ feedback is initially configured, the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection of the first terminal 101 may be initialized to 0. Exemplarily, the first unicast connection may be any unicast connection established by the first terminal 101. Exemplarily, the fourth carrier may be any carrier in the carrier supporting SL HARQ feedback associated with the first unicast connection.

[0283] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold associated with carrier A2 is initially configured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is initialized to 0; when the preset threshold associated with carrier A4 is initially configured, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0; when the preset threshold associated with carrier A5 is initially configured, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is reinitialized to 0; when the preset threshold associated with carrier A6 is initially configured, the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is initialized to 0.

[0284] In some embodiments, if the fourth carrier association in the carrier supporting SL HARQ feedback is reconfigured, the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection of the first terminal 101 may be reinitialized to 0. Exemplarily, the first unicast connection may be any unicast connection established by the first terminal 101. Exemplarily, the fourth carrier may be any carrier in the carrier supporting SL HARQ feedback associated with the first unicast connection.

[0285] For example, the carriers supporting SL HARQ feedback associated with the first unicast connection are carriers A2, A4, A5, and A6. When the preset threshold associated with carrier A2 is reconfigured, the DTX count based on HARQ feedback of carrier A2 associated with the first unicast connection is reinitialized to 0; when the preset threshold associated with carrier A4 is reconfigured, the DTX count based on HARQ feedback of carrier A4 associated with the first unicast connection is initialized to 0; when the preset threshold associated with carrier A5 is reconfigured, the DTX count based on HARQ feedback of carrier A5 associated with the first unicast connection is reinitialized to 0; when the preset threshold associated with carrier A6 is reconfigured, the DTX count based on HARQ feedback of carrier A6 associated with the first unicast connection is reinitialized to 0.

[0286] In some embodiments, if the DTX counts based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the first terminal 101 are greater than or equal to the preset threshold associated with the carrier supporting SL HARQ feedback, it can be determined that SL RLF based on HARQ feedback occurs in the first unicast connection. Exemplarily, the first unicast connection can be any unicast connection established by the first terminal 101.

[0287] For example, the carriers supporting SL HARQ feedback associated with a unicast connection of the first terminal 101 are A2, A4, A5, and A6. If the DTX count based on HARQ feedback corresponding to carrier A2 is greater than or equal to the preset threshold associated with carrier A2, the DTX count based on HARQ feedback corresponding to carrier A4 is greater than or equal to the preset threshold associated with carrier A4, the DTX count based on HARQ feedback corresponding to carrier A5 is greater than or equal to the preset threshold associated with carrier A5, and the DTX count based on HARQ feedback corresponding to carrier A6 is greater than or equal to the preset threshold associated with carrier A6, it can be determined that SL RLF based on HARQ feedback occurs in the unicast connection.

[0288] In some embodiments, if the first unicast connection has an SL RLF based on HARQ feedback, the RRC layer may be notified that the first unicast connection has an SL RLF based on HARQ feedback, and the RRC layer may release the first unicast connection. Exemplarily, if the media access control MAC layer of the first terminal 101 determines that the first unicast connection has an SL RLF based on HARQ feedback, the RRC layer may be notified, and the RRC layer releases the first unicast connection. Exemplarily, the first unicast connection may be any unicast connection established by the first terminal 101.

[0289] The DTX counting method based on SL HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3501 to S3502. For example, step S3501 may be implemented as an independent embodiment, step S3502 may be implemented as an independent embodiment, and steps S3501 and S3502 may be implemented as independent embodiments, but are not limited thereto.

[0290] In this implementation manner or example, unless there is any contradiction, each step can be independent, combined arbitrarily or exchanged in order, and the optional methods or optional examples can be combined arbitrarily.

[0291] FIG4 is a flow chart of a method for counting DTX based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG4 , an embodiment of the present disclosure relates to a method for counting DTX based on SL HARQ feedback, which is used for a second terminal 102, and the method includes:

[0292] Step S4101, obtaining side link data.

[0293] The optional implementation of step S4101 can refer to the optional implementation of step S2101 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

[0294] In some embodiments, the second terminal 102 may be a terminal having a unicast connection with the first terminal 101 .

[0295] In some embodiments, the second terminal 102 can receive side link data sent by the first terminal 101, and can also receive side link data sent by other entities, without limitation.

[0296] In this implementation manner or example, the optional modes or optional examples may be arbitrarily combined unless there is any contradiction.

[0297] FIG5 is an interactive schematic diagram of a DTX counting method based on SL HARQ feedback according to an embodiment of the present disclosure. As shown in FIG5, an embodiment of the present disclosure relates to a DTX counting method based on SL HARQ feedback, which is used in a communication system 100, wherein the communication system 100 includes a first terminal 101 and a second terminal 102, and the method includes:

[0298] Step S5101: determine a carrier in aggregated carriers that supports SL HARQ feedback.

[0299] The optional implementation of step S5101 can refer to the optional implementation of step S2102 mentioned above, which will not be repeated here.

[0300] Step S5102: Perform DTX counting based on HARQ feedback for the carrier supporting SL HARQ feedback.

[0301] The optional implementation of step S5102 can refer to the optional implementation of step S2102 mentioned above, which will not be repeated here.

[0302] In some embodiments, the communication system 100 may further include a network device 103 .

[0303] In some embodiments, the above method may include the method described in the above embodiments of the communication system side, the first terminal side, the second terminal side, etc., which will not be repeated here.

[0304] In this implementation mode or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other implementation modes or other examples.

[0305] The following is an exemplary introduction to the above method.

[0306] Optional embodiment: separately counting the DTX count based on HARQ feedback on carriers supporting SL HARQ feedback.

[0307] Optionally, DTX counting based on HARQ feedback is performed for carriers that support SL HARQ feedback, and DTX counting based on HARQ feedback is not performed for carriers that do not support SL HARQ feedback. Exemplarily, carriers A, B, and C are carriers aggregated for the first unicast connection, wherein carrier A supports cross-carrier SL HARQ feedback, and the SL HARQ feedback of the PSSCH on carrier A is transmitted through the PSFCH resources on carrier C, carrier B does not support cross-carrier feedback, and the SL HARQ feedback of the PSSCH on carrier B is transmitted through the PSFCH resources on carrier B, carrier C does not support cross-carrier feedback, and the SL HARQ feedback of the PSSCH on carrier C is transmitted through the PSFCH on carrier C. Therefore, for the first unicast connection, DTX counting based on HARQ feedback is performed for carrier B and carrier C respectively. DTX counting based on SL HARQ feedback is not performed for carrier A.

[0308] Specifically, the UE maintains a continuous DTX detection variable (numConsecutiveDTX) for each carrier supporting SL HARQ feedback associated with the first unicast connection, and the variable is used to count the number of DTXs based on HARQ feedback for the first unicast connection on this carrier. Exemplarily, for the first unicast connection, the UE maintains numConsecutiveDTX variables associated with carrier B and carrier C respectively.

[0309] Optionally, when the first unicast connection is established or carrier aggregation is enabled, the UE initializes the variable numConsecutiveDTX corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection to 0. When the preset threshold is reconfigured / initialized (specifically, if it is a threshold configured per UE, when the threshold is initially configured or reconfigured, for each unicast connection (each unicast connection established by the high layer of the terminal device), the DTX variable corresponding to the carrier supporting SL HARQ feedback is initialized to 0; if it is a threshold configured per carrier, for example, a threshold configured per carrier supporting SL HARQ feedback, when the threshold corresponding to a carrier supporting SL HARQ feedback is initially configured or reconfigured, for each unicast connection supporting this carrier (each unicast connection established by the high layer of the terminal device supporting this carrier), the DTX variable corresponding to this carrier is initialized to 0). The UE obtains the preset threshold configuration from the configuration or pre-configuration of the network device.

[0310] The preset threshold can be configured per UE or per carrier. A UE in an RRC connected state can obtain the preset threshold through dedicated signaling, a UE in an RRC IDLE / INACTIVE state can obtain the preset threshold through SIB, and a UE in OOC (Out of Coverage) can obtain the preset threshold through pre-configuration.

[0311] Optionally, for the first unicast connection, the UE detects SL HAFQ feedback on a carrier that supports SL HARQ feedback, and the UE resets the numConsecutiveDTX associated with the carrier that supports SL HARQ feedback to 0. Exemplarily, for the first unicast connection, for each associated PSFCH opportunity, it is necessary to detect whether there is SL HARQ feedback. If the UE detects SL HARQ feedback on carrier B (the detection opportunity is the PSFCH opportunity on carrier B, and the PSFCH opportunity is associated with the PSSCH transmission of the first unicast connection), the UE resets the numConsecutiveDTX associated with carrier B to 0. If no SL HARQ feedback is detected on the associated PSFCH opportunity, the UE adds 1 to the numConsecutiveDTX associated with carrier B.

[0312] Optional embodiment: for the first unicast connection, the terminal device determines that the DTX count based on HARQ feedback of all carriers supporting SL HARQ feedback reaches a maximum value, and the terminal device triggers SL RLF.

[0313] Optionally, for the first unicast connection, if the numConsecutiveDTX associated with the carrier supporting SL HARQ feedback reaches a preset threshold, the UE considers that the first unicast connection has a SL RLF based on HARQ feedback, and notifies the RRC layer that the first unicast connection has a SL RLF based on HARQ feedback. The RRC layer releases the first unicast connection. Exemplarily, the numConsecutiveDTX associated with carrier B and carrier C reach a preset threshold, and the UE triggers the SL RLF. Exemplarily, the carrier supporting SL HARQ feedback can be understood as the carrier that carries the SL HARQ feedback for the first unicast connection, etc. The specific name is not specifically limited in this disclosure.

[0314] It should be noted that, in the present disclosure, the DTX count based on HARQ feedback and the number of DTX times based on HARQ feedback can be replaced with each other.

[0315] In the embodiments of the present disclosure, part or all of the steps and their optional implementations may be arbitrarily combined with part or all of the steps in other embodiments, or may be arbitrarily combined with optional implementations of other embodiments.

[0316] The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device is proposed, the above device includes a unit or module for implementing each step performed by the terminal in any of the above methods. For another example, another device is also proposed, including a unit or module for implementing each step performed by a network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0317] It should be understood that the division of the units or modules in the above device is only a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the units or modules in the device can be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory inside the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above hardware circuits can be understood as one or more processors; for example, in one implementation, the above hardware circuit is an application-specific integrated circuit (ASIC), and the functions of some or all of the above units or modules are realized by designing the logical relationship of the components in the circuit; for example, in another implementation, the above hardware circuit can be realized by a programmable logic device (PLD), taking a field programmable gate array (FPGA) as an example, which can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by a configuration file, so as to realize the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of a processor calling software, or in the form of a hardware circuit, or in part by a processor calling software, and the rest by a hardware circuit.

[0318] In the disclosed embodiment, the processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which may be understood as a microprocessor), or a digital signal processor (DSP), etc.; in another implementation, the processor may realize certain functions through the logical relationship of the hardware circuit, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the processor loads a configuration document to implement the process of hardware circuit configuration, which may be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it may also be a hardware circuit designed for artificial intelligence, which may be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0319] Figure 6A is a schematic diagram of the structure of the terminal proposed in an embodiment of the present disclosure. As shown in Figure 6A, the terminal 6100 may include: at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the processing module is used to determine the carrier that supports SL HARQ feedback in the aggregated carrier; and perform DTX counting based on HARQ feedback on the carrier that supports SL HARQ feedback. Optionally, the transceiver module is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S2101, but not limited to this) performed by the first terminal 101 in any of the above methods, which will not be repeated here. Optionally, the processing module is used to execute at least one of the other steps (for example, step S2102, but not limited to this) performed by the first terminal 101 in any of the above methods, which will not be repeated here.

[0320] FIG6B is a schematic diagram of the structure of a network device proposed in an embodiment of the present disclosure. As shown in FIG6B , the network device 6200 may include: at least one of a transceiver module 6201, a processing module 6202, etc. In some embodiments, the transceiver module is used to send configuration information to the terminal, wherein the configuration information is used to determine a preset threshold value for supporting carrier association for supporting SL HARQ feedback.

[0321] In some embodiments, the transceiver module may include a sending module and / or a receiving module, and the sending module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0322] In some embodiments, the processing module can be a module or include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be replaced with the processor.

[0323] FIG7A is a schematic diagram of the structure of a communication device 7100 proposed in an embodiment of the present disclosure. The communication device 7100 may be a network device (e.g., an access network device, a core network device, etc.), or a terminal (e.g., a user device, etc.), or a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. The communication device 7100 may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

[0324] As shown in FIG. 7A , the communication device 7100 includes one or more processors 7101. The processor 7101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and the communication data, and the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a program, and process the data of the program. The communication device 7100 is used to execute any of the above methods.

[0325] In some embodiments, the communication device 7100 further includes one or more memories 7102 for storing instructions. Optionally, all or part of the memory 7102 may also be outside the communication device 7100.

[0326] In some embodiments, the communication device 7100 further includes one or more transceivers 7103. When the communication device 7100 includes one or more transceivers 7103, the transceiver 7103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2102, but not limited thereto), and the processor 7101 performs at least one of the other steps (for example, step S2101, but not limited thereto).

[0327] In some embodiments, the transceiver may include a receiver and / or a transmitter, and the receiver and the transmitter may be separate or integrated. Optionally, the terms such as transceiver, transceiver unit, transceiver, transceiver circuit, etc. may be replaced with each other, the terms such as transmitter, transmission unit, transmitter, transmission circuit, etc. may be replaced with each other, and the terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other.

[0328] In some embodiments, the communication device 7100 may include one or more interface circuits 7104. Optionally, the interface circuit 7104 is connected to the memory 7102, and the interface circuit 7104 may be used to receive signals from the memory 7102 or other devices, and may be used to send signals to the memory 7102 or other devices. For example, the interface circuit 7104 may read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0329] The communication device 7100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 7100 described in the present disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0330] 7B is a schematic diagram of the structure of a chip 7200 provided in an embodiment of the present disclosure. In the case where the communication device 7100 may be a chip or a chip system, reference may be made to the schematic diagram of the structure of the chip 7200 shown in FIG. 7B , but the present disclosure is not limited thereto.

[0331] The chip 7200 includes one or more processors 7201, and the chip 7200 is used to execute any of the above methods.

[0332] In some embodiments, the chip 7200 further includes one or more interface circuits 7202. Optionally, the interface circuit 7202 is connected to the memory 7203. The interface circuit 7202 can be used to receive signals from the memory 7203 or other devices, and the interface circuit 7202 can be used to send signals to the memory 7203 or other devices. For example, the interface circuit 7202 can read instructions stored in the memory 7203 and send the instructions to the processor 7201.

[0333] In some embodiments, the interface circuit 7202 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, but not limited to this), and the processor 7201 performs at least one of the other steps (for example, step S2102, but not limited to this).

[0334] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0335] In some embodiments, the chip 7200 further includes one or more memories 7203 for storing instructions. Optionally, all or part of the memory 7203 may be outside the chip 7200.

[0336] The present disclosure also proposes a storage medium, on which instructions are stored, and when the instructions are executed on the communication device 7100, the communication device 7100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited to this, and it can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a temporary storage medium.

[0337] The present disclosure also proposes a program product, which, when executed by the communication device 7100, enables the communication device 7100 to execute any of the above methods. Optionally, the program product is a computer program product.

[0338] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to execute any one of the above methods.

Claims

A method for counting discontinuous reception (DTX) based on sidelink hybrid automatic repeat request (SL) HARQ feedback, characterized in that: The method comprises: a terminal determines a carrier supporting SL HARQ feedback in an aggregated carrier; and performs DTX counting based on HARQ feedback on the carrier supporting SL HARQ feedback. The method according to claim 1, characterized in that The method of determining the carrier supporting SL HARQ feedback in the aggregated carriers includes at least one of the following items: the SL HARQ feedback corresponding to the physical sidelink shared channel PSSCH on the first carrier in the aggregated carriers is transmitted on the second carrier, and the second carrier is determined to be the carrier supporting SL HARQ feedback; the SL HARQ feedback corresponding to the PSSCH on the third carrier in the aggregated carriers is transmitted on the third carrier, and the third carrier is determined to be the carrier supporting SL HARQ feedback. The method according to claim 2, characterized in that The DTX counting based on HARQ feedback for the carrier supporting SL HARQ feedback includes: for the first unicast connection, the SL HARQ feedback corresponding to the PSSCH associated with the first unicast connection on the first carrier is transmitted on the second carrier, and the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on the second carrier; wherein the first unicast connection is any unicast connection established by the terminal; if the SL HARQ feedback of the PSSCH is not detected at the PSFCH opportunity, the DTX count based on HARQ feedback corresponding to the second carrier associated with the first unicast connection is increased by 1; if the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity, the DTX count based on HARQ feedback corresponding to the second carrier associated with the first unicast connection is reinitialized to 0. The method according to any one of claims 1 to 3, characterized in that Also includes: The first unicast connection of the terminal establishes or enables carrier aggregation, and initializes the DTX count based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection to 0, wherein the first unicast connection is any unicast connection established by the terminal. The method according to any one of claims 1 to 4, characterized in that Also includes: Receive configuration information sent by a network device; and acquire a preset threshold associated with the carrier supporting SL HARQ feedback according to the configuration information. The method according to claim 5, characterized in that The receiving configuration information sent by the network device includes any one of the following items: receiving the configuration information sent by the network device through dedicated signaling, wherein the terminal is in a radio resource control RRC connected state; receiving the configuration information sent by the network device through a system information block SIB message, wherein the terminal is in an RRC idle state or an RRC sleep state. The method according to any one of claims 1 to 4, characterized in that Also includes: The preset threshold associated with the carrier supporting SL HARQ feedback is obtained through pre-configuration. The method according to any one of claims 5 to 7, characterized in that The obtaining, according to the configuration information, the preset threshold associated with the carrier supporting SL HARQ feedback includes: obtaining the preset threshold corresponding to the terminal in the configuration information, and determining the corresponding preset threshold as the preset threshold associated with the carrier supporting SL HARQ feedback. The method according to claim 8, characterized in that It also includes at least one of the following: initial configuration of the preset threshold corresponding to the terminal, initializing the DTX count of the HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the terminal to 0; reconfiguration of the preset threshold corresponding to the terminal, reinitializing the DTX count of the HARQ feedback corresponding to the preset threshold associated with the carrier supporting SL HARQ feedback associated with the first unicast connection to 0. The method according to any one of claims 5 to 7, characterized in that The obtaining of the preset threshold associated with the carrier supporting SL HARQ feedback according to the configuration information includes: obtaining the preset threshold corresponding to the carrier supporting SL HARQ feedback in the configuration information, and determining the corresponding preset threshold as the preset threshold associated with the carrier supporting SL HARQ feedback. The method according to claim 10, characterized in that It also includes at least one of the following items: initial configuration of a preset threshold associated with the fourth carrier among the carriers supporting SL HARQ feedback, and initialization of the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection of the terminal to 0; wherein the fourth carrier is any carrier among the carriers supporting SL HARQ feedback associated with the first unicast connection; reconfiguration of the preset threshold associated with the fourth carrier, and reinitialization of the DTX count of the HARQ feedback corresponding to the fourth carrier associated with the first unicast connection to 0. The method according to any one of claims 1 to 11, characterized in that Also includes: The DTX count based on HARQ feedback corresponding to the carrier supporting SL HARQ feedback associated with the first unicast connection of the terminal is greater than or equal to the preset threshold associated with the carrier supporting SL HARQ feedback, determining that the first unicast connection has a side link radio link failure SL RLF based on HARQ feedback. The method according to claim 12, characterized in that Also includes: Notify the RRC layer that the first unicast connection has a SL RLF based on HARQ feedback; and the RRC layer releases the first unicast connection. A terminal, characterized in that: include: The processing module is used to determine a carrier supporting SL HARQ feedback in the aggregated carrier; and perform DTX counting based on HARQ feedback on the carrier supporting SL HARQ feedback. A terminal, characterized in that: include: One or more processors; wherein the terminal is used to execute the DTX counting method based on HARQ feedback according to any one of claims 1-13. A communication system, characterized in that: The invention comprises a terminal and a network device connected to the terminal, wherein the terminal is configured to implement the DTX counting method based on HARQ feedback according to any one of claims 1 to 13. A storage medium stores instructions, characterized in that: When the instruction is executed on a communication device, the communication device is enabled to execute the DTX counting method based on HARQ feedback according to any one of claims 1 to 13.

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