Counting method of dtx based on harq feedback, terminal

Abstract

The present disclosure relates to a method for counting DTX based on HARQ feedback, a terminal, wherein the method comprises: selecting or reselecting a fifth carrier associated with a first unicast connection according to at least one of a first carrier, a second carrier configured by a network device, a third carrier supported by a first terminal and a fourth carrier supported by a second terminal; and counting DTX based on HARQ feedback on the fifth carrier; wherein the first carrier is a carrier corresponding to a target address or a carrier corresponding to a sidelink logical channel (SL LCH) triggering the carrier selection or reselection, the target address is associated with the first unicast connection, and the first unicast connection is a unicast connection between the first terminal and the second terminal. Thus, in the SL carrier aggregation scenario, the transmitting terminal counts DTX based on HARQ feedback on the selected or reselected carrier, which not only saves resources, but also reduces the packet loss rate and improves the communication quality by transmitting sidelink data to the receiving terminal through the selected or reselected carrier.

Description

Technical Field

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

[0002] To meet the requirements of single-user peak rate and system capacity improvement, the system transmission bandwidth can be increased, for example, by using carrier aggregation (CA). Sidelink (SL) communication can also use carrier aggregation. Summary of the Invention

[0003] The method disclosed herein can be used to solve the technical problem of "which carriers to count based on HARQ feedback in SL carrier aggregation scenarios".

[0004] This disclosure presents a DTX counting method and terminal based on HARQ feedback.

[0005] According to a first aspect of the present disclosure, a DTX counting method based on HARQ feedback is proposed, executed by a first terminal, the method comprising: Select or reselect the fifth carrier associated with the first unicast connection based on at least one of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal; Perform DTX counting based on HARQ feedback on the fifth carrier; Wherein, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that has triggered carrier selection or reselection. The target address or the SL LCH that has triggered carrier selection or reselection is associated with the first unicast connection. The first unicast connection is a unicast connection between the first terminal and the second terminal.

[0006] According to a second aspect of the embodiments of this disclosure, a first terminal is provided, comprising: The processing module is configured to select or reselect a fifth carrier associated with the first unicast connection based on at least one of a first carrier, a second carrier configured by the network device, a third carrier supported by the first terminal, and a fourth carrier supported by the second terminal; and to perform DTX counting on the fifth carrier based on HARQ feedback. Wherein, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that has triggered carrier selection or reselection. The target address or the SL LCH that has triggered carrier selection or reselection is associated with the first unicast connection. The first unicast connection is a unicast connection between the first terminal and the second terminal.

[0007] According to a third aspect of the embodiments of this disclosure, a terminal is provided, comprising: One or more processors; The first terminal is used to execute the DTX counting method based on HARQ feedback as described in the first aspect embodiment.

[0008] According to a fourth aspect of the present disclosure, a communication system is proposed, including a first terminal, wherein the first terminal is configured to implement the HARQ feedback-based DTX counting method described in the first aspect embodiment.

[0009] According to a fifth aspect of the present disclosure, a storage medium is provided that stores instructions that, when executed on a communication device, cause the communication device to perform a DTX counting method based on HARQ feedback as described in the first aspect.

[0010] In this embodiment, the first terminal can select or reselect a carrier associated with the first unicast connection based on one or more of the following: the carrier corresponding to the SL LCH that triggered carrier selection or reselection based on the target address, the carrier configured by the network, the carrier supported by the first terminal, and the carrier supported by the second terminal. The first terminal then performs DTX counting based on HARQ feedback on the carrier associated with the first unicast connection. Therefore, in the SL carrier aggregation scenario, the transmitting terminal can perform DTX counting based on HARQ feedback on one or more of the carriers selected or reselected based on the target address or the SL LCH that triggered carrier selection or reselection, the carrier configured by the network, the carrier supported by the transmitting terminal, and the carrier supported by the receiving terminal. This not only saves resources but also reduces the packet loss rate and improves communication quality by sending sidelink data to the receiving terminal via the selected or reselected carriers. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure; Figure 2 This is an interactive schematic diagram illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure; Figures 3A-3DThis is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of the present disclosure; Figure 4 This is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of the present disclosure; Figure 5 This is an interactive schematic diagram illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure; Figure 6 This is a schematic diagram of the structure of the first terminal proposed in the embodiments of this disclosure; Figure 7A This is a schematic diagram of the structure of the communication device proposed in the embodiments of this disclosure; Figure 7B This is a schematic diagram of the chip structure proposed in the embodiments of this disclosure. Detailed Implementation

[0012] This disclosure presents a DTX counting method and terminal based on HARQ feedback.

[0013] In a first aspect, embodiments of this disclosure propose a DTX counting method based on HARQ feedback, executed by a first terminal, the method comprising: Select or reselect the fifth carrier associated with the first unicast connection based on at least one of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal; Perform DTX counting based on HARQ feedback on the fifth carrier; Wherein, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the sidelink logical channel (SL LCH) that has triggered carrier selection or reselection. The target address or the SL LCH that has triggered carrier selection or reselection is associated with the first unicast connection. The first unicast connection is a unicast connection between the first terminal and the second terminal.

[0014] In the above embodiments, the first terminal can select or reselect a carrier associated with the first unicast connection based on one or more of the following: the carrier corresponding to the SL LCH that triggered carrier selection or reselection based on the target address, the carrier configured by the network, the carrier supported by the first terminal, and the carrier supported by the second terminal. It then performs DTX counting based on HARQ feedback on the carrier associated with the first unicast connection. Therefore, in the SL carrier aggregation scenario, the transmitting terminal can perform DTX counting based on HARQ feedback on one or more of the carriers selected or reselected based on the target address or the SL LCH that triggered carrier selection or reselection, the carrier configured by the network, the carrier supported by the transmitting terminal, and the carrier supported by the receiving terminal. This not only saves resources but also reduces the packet loss rate and improves communication quality by sending sidelink data to the receiving terminal via the selected or reselected carriers.

[0015] In conjunction with some embodiments of the first aspect, in some embodiments, selecting or reselecting the fifth carrier associated with the first unicast connection based on at least one of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal includes: Determine a first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier; Based on the first intersection, select or reselect the fifth carrier.

[0016] In the above embodiments, the first terminal can select or reselect the carrier associated with the first unicast connection based on the intersection of one or more of the following: the target address or the carrier corresponding to the SL LCH that triggered carrier selection or reselection, the carrier configured by the network, the carrier supported by the first terminal, and the carrier supported by the second terminal. By using the selected or reselected carrier, the side link data can be sent to the second terminal, which can reduce the data packet loss rate and improve the communication quality.

[0017] In conjunction with some embodiments of the first aspect, in some embodiments, selecting or reselecting the fifth carrier based on the first intersection includes: Carriers whose channel busy ratio (CBR) in the first intersection is less than or equal to a first threshold are identified as first candidate carriers; Select or reselect the fifth carrier from the first candidate carrier.

[0018] In the above embodiments, carriers whose measured CBR in the first intersection is less than or equal to the first threshold are determined as first candidate carriers. Then, carriers associated with the first unicast connection are selected or reselected from the first candidate carriers. DTX counting based on HARQ feedback is performed on the selected or reselected carriers, which can save resources. Furthermore, using these carriers to send sidelink data to the second terminal can further reduce the packet loss rate and improve communication quality.

[0019] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: The system receives first configuration information sent by the network device, wherein the first configuration information includes the first threshold.

[0020] In the above embodiments, the first terminal can obtain the first threshold configured by the network device, thereby configuring the first threshold according to actual needs and improving the flexibility of the first threshold configuration.

[0021] In conjunction with some embodiments of the first aspect, in some embodiments, receiving the first configuration information sent by the network device includes any one of the following: The first terminal receives the first configuration information sent by the network device via dedicated signaling, and is in a radio resource control (RRC) connected state; The first terminal receives the first configuration information sent by the network device through a system information block (SIB), and the first terminal is in an RRC idle state or an RRC sleep state. The first configuration information is obtained through pre-configuration, and the first terminal is outside of coverage (OOC).

[0022] In the above embodiments, when the first terminal is in the RRC connected state, it can obtain the first threshold of the network configuration through dedicated signaling. When the first terminal is in the RRC idle state or RRC dormant state, it can obtain the first threshold of the network configuration through SIB. When the first terminal is in the OOC state, it can obtain the first threshold through pre-configuration. Thus, the first terminal can obtain the first threshold in different ways according to its state, which improves the flexibility of obtaining the first threshold.

[0023] In conjunction with some embodiments of the first aspect, in some embodiments, selecting or reselecting the fifth carrier based on the first intersection includes: The carriers in the first intersection are determined as the second candidate carriers; Select or reselect the fifth carrier from the second candidate carrier.

[0024] In the above embodiments, the first terminal can determine the carriers in the first intersection as the second candidate carriers, and select or reselect the carriers associated with the first unicast connection from the second candidate carriers. This allows for the DTX counting of the carriers associated with the first unicast connection based on HARQ feedback, which not only saves resources but also reduces the packet loss rate and improves communication quality by using the carriers associated with the first unicast connection to send sidelink data to the second terminal.

[0025] In conjunction with some embodiments of the first aspect, in some embodiments, determining the first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier includes: The intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier is determined as the first intersection.

[0026] In the above embodiments, the first terminal can select or reselect the carrier associated with the first unicast connection based on the target address or the carrier corresponding to the SL LCH that triggered carrier selection or reselection, the carrier configured by the network, the intersection of the carriers supported by the first terminal and the carriers supported by the second terminal. This allows for the DTX counting of the carriers associated with the first unicast connection based on HARQ feedback, which not only saves resources but also effectively reduces the packet loss rate and improves communication quality by using the carriers associated with the first unicast connection to send sidelink data to the second terminal.

[0027] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: The first terminal receives second configuration information from a higher layer, the second configuration information including a mapping relationship between a quality of service (QoS) stream and a carrier and / or a mapping relationship between the target address and the QoS stream, the QoS stream being associated with a unicast service; The first carrier is determined based on the second configuration information.

[0028] In the above embodiments, the carrier mode configured by the higher layer can be obtained according to the mapping relationship between QoS flow and carrier and / or the mapping relationship between target address and QoS flow configured by the first terminal, thereby improving the flexibility of obtaining the carrier configured by the higher layer.

[0029] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: The third configuration information received from the higher layer of the first terminal includes a mapping relationship between the first service and the target address and / or a mapping relationship between the first service and the carrier, wherein the first service is a unicast service. The first carrier is determined based on the third configuration information.

[0030] In the above embodiments, the carrier configuration of the higher layer can be obtained according to the mapping relationship between the first service and the target address of the first terminal and / or the mapping relationship between the first service and the carrier, which improves the flexibility of obtaining the carrier configuration of the higher layer.

[0031] In conjunction with some embodiments of the first aspect, in some embodiments, the third carrier is a carrier that the first terminal supports for transmission and / or reception, and the fourth carrier is a carrier that the second terminal supports for reception and / or transmission.

[0032] In the above embodiments, the first terminal can select or reselect the carrier associated with the first unicast connection based on the carriers it supports for transmission and / or reception, and the carriers the second terminal supports for transmission and / or reception. This allows for the performance of DTX counting based on HARQ feedback on the carriers associated with the first unicast connection, which not only saves resources but also reduces the packet loss rate and improves communication quality by using the carriers associated with the first unicast connection to send sidelink data to the second terminal.

[0033] In conjunction with some embodiments of the first aspect, in some embodiments, performing DTX counting on the fifth carrier based on HARQ feedback includes: On each of the fifth carriers, the SL HARQ feedback of the PSSCH is detected at the timing of the physical sidelink shared channel (PSSCH) associated with the first unicast connection. If no SL HARQ feedback of the PSSCH is detected at the PSFCH timing, increment the DTX count based on HARQ feedback for each of the fifth carriers associated with the first unicast connection by 1; When the SL HARQ feedback of the PSSCH is detected at the PSFCH timing, the DTX count based on HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection is reinitialized to 0.

[0034] In the above embodiments, the first terminal can detect the SL HARQ feedback of the PSSCH when the PSFCH corresponding to the PSSCH associated with the first unicast connection is on each fifth carrier, thereby realizing the DTX counting based on HARQ feedback for each fifth carrier associated with the first unicast connection.

[0035] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: If the DTX counts based on HARQ feedback corresponding to the fifth carrier are all greater than or equal to the second threshold, it is determined that the first unicast connection has experienced a sidelink radio link failure (SL RLF) based on HARQ feedback.

[0036] In the above embodiments, when the DTX counts based on HARQ feedback corresponding to the fifth carrier associated with the first unicast connection are all greater than or equal to the second threshold, it can be determined that the first unicast connection has experienced an SL RLF based on HARQ feedback, thus improving the accuracy of the judgment.

[0037] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: The network device receives fourth configuration information, wherein the fourth configuration information includes the second threshold.

[0038] In the above embodiments, the first terminal can obtain the second threshold configured by the network device, thereby configuring the second threshold according to actual needs and improving the flexibility of the second threshold configuration.

[0039] In conjunction with some embodiments of the first aspect, in some embodiments, receiving the fourth configuration information sent by the network device includes any one of the following: The first terminal receives the fourth configuration information sent by the network device via dedicated signaling, and is in RRC connection state; The first terminal receives the fourth configuration information sent by the network device via SIB, and is in RRC idle state or RRC sleep state. The fourth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

[0040] In the above embodiments, when the first terminal is in the RRC connected state, it can obtain the second threshold configured by the network through dedicated signaling. When the first terminal is in the RRC idle state or RRC dormant state, it can obtain the second threshold configured by the network through SIB. When the first terminal is in the OOC state, it can obtain the second threshold through pre-configuration. Thus, the first terminal can obtain the second threshold in different ways according to its state, which improves the flexibility of obtaining the first threshold.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: The system receives indication information sent by the second terminal, wherein the indication information is used to indicate the fourth carrier supported by the second terminal.

[0042] In the above embodiments, the first terminal can receive indication information sent by the second terminal, thereby obtaining the fourth carrier supported by the second terminal according to the indication information. Then, according to the fourth carrier supported by the second terminal, it can select or reselect the carrier associated with the first unicast connection. Thus, it performs DTX counting based on HARQ feedback on the carrier associated with the first unicast connection, which not only saves resources, but also uses the carrier associated with the first unicast connection to send sidelink data to the second terminal, which can further reduce the data packet loss rate and improve communication quality.

[0043] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: The network device receives fifth configuration information, wherein the fifth configuration information includes the second carrier.

[0044] In the above embodiments, the first terminal can obtain the carrier configured by the network device, thereby configuring the carrier for the first terminal according to actual needs and improving the flexibility of network carrier configuration.

[0045] In conjunction with some embodiments of the first aspect, in some embodiments, receiving the fifth configuration information sent by the network device includes any one of the following: The first terminal receives the fifth configuration information sent by the network device via dedicated signaling, and is in RRC connection state; The first terminal receives the fifth configuration information sent by the network device via SIB, and is in RRC idle state or RRC sleep state. The fifth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

[0046] In the above embodiments, when the first terminal is in the RRC connected state, it can obtain the second carrier configured by the network through dedicated signaling. When the first terminal is in the RRC idle state or RRC dormant state, it can obtain the second carrier configured by the network through SIB. When the first terminal is in the OOC state, it can obtain the second carrier through pre-configuration. Thus, the first terminal can obtain the second carrier in different ways according to its state, which improves the flexibility of obtaining the second carrier.

[0047] Secondly, embodiments of this disclosure propose a first terminal, which includes at least one of a transceiver module and a processing module: wherein the first terminal is used to execute the methods described in the first aspect and optional implementations of the first aspect.

[0048] Thirdly, embodiments of this disclosure propose a terminal, which includes: one or more processors; wherein, the first terminal is used to execute the methods described in the first aspect and optional implementations of the first aspect.

[0049] Fourthly, embodiments of this disclosure propose a communication system including a first terminal, wherein the first terminal is configured to implement the method described in the first aspect and the optional implementation of the first aspect.

[0050] Fifthly, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the method described in the first aspect and its optional implementations.

[0051] In a sixth aspect, embodiments of this disclosure provide a program product that, when executed by a communication device, causes the communication device to perform the method as described in the first aspect and its optional implementations.

[0052] Eighthly, embodiments of this disclosure provide a chip or chip system. The chip or chip system includes processing circuitry configured to execute according to the first aspect and optional implementations thereof.

[0053] It is understood that the aforementioned terminals, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0054] This disclosure provides a counting method and terminal for DTX based on HARQ feedback. In some embodiments, the terms "counting method for DTX based on HARQ feedback" and "information processing method" and "communication method" can be used interchangeably; the terms "information transmission device" and "information processing device" and "communication device" can be used interchangeably; and the terms "information processing system" and "communication system" can be used interchangeably.

[0055] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular 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 particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0056] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0057] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0058] In this disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular or a plural expression.

[0059] In this disclosure, "multiple" refers to two or more.

[0060] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, and “multiple” may be used interchangeably.

[0061] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (executes A regardless of B); in some embodiments, B (executes B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0062] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0063] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0064] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0065] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0066] 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”, “circuit”, “network element”, “node”, “function”, “unit”, “section”, “system”, “network”, “chip”, “chip system”, “entity”, and “subject” can be used interchangeably.

[0067] In some embodiments, the terms "access network device (AN device)," "radio access network device (RAN device)," "base station (BS)," "radio base station," "fixed station," "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "carrier," "component carrier," and "bandwidth part (BWP)" can be used interchangeably.

[0068] 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 subscriberstation, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, and client can be used interchangeably.

[0069] In some embodiments, access network devices, core network devices, or network devices can be replaced with terminals. For example, embodiments of this disclosure can also be applied to structures that replace communication between access network devices, core network devices, or network devices and terminals with communication between multiple terminals (e.g., also referred to as device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the structure can also be configured such that the terminal has all or part of the functions of the access network device. Furthermore, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can be replaced with sidelink channel, uplink link, downlink link, etc., can be replaced with sidelink link.

[0070] 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, core network device, or network device may also be configured to have all or some of the functions of the terminal.

[0071] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0072] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0073] Figure 1 This is a schematic diagram of the architecture of a communication system according to embodiments of this disclosure. Figure 1 As shown, the communication system 100 may include a first terminal 101 and a second terminal 102. 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.

[0074] In some embodiments, the communication system 100 may further include a network device, and a communication connection may be established between the first terminal 101 and the network device. The network device may include at least one of an access network device and a core network device.

[0075] In some embodiments, the first terminal 101 or the second terminal 102 includes, for example, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home, but is not limited thereto.

[0076] In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include, but is not limited to, at least one of the following in a 5G communication system: evolved Node B (eNB), next-generation eNB (ng-eNB), next-generation Node B (gNB), node B (NB), home node B (HNB), home evolved node B (HeNB), wireless backhaul device, radio network controller (RNC), base station controller (BSC), base transceiver station (BTS), base band unit (BBU), mobile switching center, base station in a 6G communication system, open RAN, cloud RAN, base station in other communication systems, and access node in a WiFi system.

[0077] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0078] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0079] In some embodiments, a core network device may be a single device comprising one or more network elements, or it may be multiple devices or a group of devices, each comprising all or part of one or more network elements. Network elements 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), or a Next Generation Core (NGC).

[0080] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0081] The following embodiments of this disclosure can be applied to Figure 1 The communication system 100 shown, or a part thereof, but not limited to it. Figure 1 The entities shown are illustrative; a communication system may include... Figure 1 All or part of the main body, or may include Figure 1 Other entities besides the main body, the number and form of each entity are arbitrary, the connection relationship between the entities is illustrative, the entities may not be connected or may be connected, and the connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0082] The embodiments disclosed herein can 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), Futuregeneration radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0083] To support direct communication between terminals, the SL communication method was introduced. Optionally, the interface between terminals can be PC-5 (direct communication interface).

[0084] In some embodiments, the terms “side”, “sidelink”, “sidecommunication”, “sidelink communication”, “direct connection”, “direct link”, “direct communication”, and “direct link communication” can be used interchangeably.

[0085] Optionally, depending on the correspondence between the sending terminal and the receiving terminal, three transmission modes are supported on SL: unicast, multicast, and broadcast.

[0086] Optionally, SL communication has two resource allocation methods: one is network-scheduled resource allocation, and the other is terminal-selected resource allocation from a network-configured or pre-configured resource pool. In the network-scheduled resource allocation method, the network device dynamically allocates SL resources to the terminal based on the terminal's cached data report. In the self-selected resource allocation method, the terminal randomly selects resources from the network-configured or pre-configured resource pool. Optionally, the network device can configure multiple resource pools for the terminal on a single BWP. Optionally, the specific resource allocation method used by the terminal can be configured by the network device via RRC signaling.

[0087] 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.

[0088] In some embodiments, the name of the method for autonomously selecting to send resources is not limited; for example, the method for autonomously selecting to send resources may be mode 2.

[0089] In some embodiments, on unlicensed spectrum, both downlink and uplink channel access rely on the listen-before-talk (LBT) characteristic. The wireless device or base station must first "sense" the communication channel, detecting the absence of communication before any transmission occurs. When a communication channel is an unlicensed wideband carrier (e.g., several hundred MHz), the LBT process relies on detecting energy levels across 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.

[0090] In some embodiments, the HARQ-feedback-based SL RLF detection mechanism, for a unicast connection, if a terminal does not receive HARQ feedback (DTX) for a certain number of consecutive times on the PSFCH resource, the terminal can consider that the unicast connection has experienced HARQ-feedback-based SL RLF and notify the RRC layer. The RRC controls the HARQ-feedback-based SL RLF detection by configuring a maximum number of consecutive DTXs (sl-maxNumConsecutiveDTX) for each terminal (per UE). Simultaneously, the terminal maintains a numConsecutiveDTX variable for each unicast connection, which is used to count the number of consecutive DTXs for that unicast connection. When a unicast connection is established, or when sl-maxNumConsecutiveDTX is reconfigured or initially configured, the terminal initializes the variable numConsecutiveDTX corresponding to that unicast connection to 0. For each PSFCH reception time associated with each PSSCH transmission of this unicast connection, the terminal counts whether there is a DTX. If no HARQ feedback is received at the PSFCH time, the terminal increments the variable numConsecutiveDTX corresponding to that unicast connection by 1. When the numConsecutiveDTX variable corresponding to the unicast connection reaches its maximum value sl-maxNumConsecutiveDTX, the terminal considers that the unicast connection has undergone a HARQ-based SL RLF and notifies the RRC layer. If the terminal receives HARQ feedback at the PSFCH timing, the terminal initializes the numConsecutiveDTX variable corresponding to the unicast connection to 0.

[0091] In some embodiments, in carrier aggregation scenarios, DTX based on HARQ feedback can be counted at the carrier granularity. Even if the DTX count based on HARQ feedback for one or more carriers reaches its maximum value, the terminal device still has other carriers available to use, and the terminal does not trigger SL RLF.

[0092] In some embodiments, the detailed method for performing HARQ-based DTX counting on specific carriers in SL carrier aggregation scenarios is not yet clear.

[0093] Based on this, this disclosure proposes a counting method for DTX based on HARQ feedback.

[0094] Optionally, in some embodiments, the method of this disclosure can be applied to SL carrier aggregation scenarios. Exemplarily, in some embodiments, the method of this disclosure can be applied to vehicle-to-everything (V2X) scenarios.

[0095] Figure 2 This is an interactive schematic diagram illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 2As shown, this disclosure relates to a DTX counting method based on HARQ feedback for a communication system 100. The method includes: In step S2101, the first terminal 101 selects or reselects the fifth carrier associated with the first unicast connection.

[0096] In some embodiments, "carrier", "band", "spectrum" and "frequency" can be used interchangeably.

[0097] In some embodiments, the first unicast connection may be a unicast connection between the first terminal 101 and the second terminal 102.

[0098] In some embodiments, the first terminal 101 is a sending terminal and the second terminal 102 is a receiving terminal.

[0099] In some embodiments, the first carrier is the carrier corresponding to the target address, or the carrier corresponding to the SL LCH that triggered carrier selection or reselection. Exemplarily, the target address may be a destination L2 ID. Exemplarily, the target address or the carrier corresponding to the SL LCH that triggered carrier selection or reselection is associated with the first unicast connection, and the second terminal 102 associated with the target address and the first unicast connection.

[0100] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the target address. The access stratum (AS layer) of the first terminal 101 can receive second configuration information sent by the higher layer of the first terminal 101. The second configuration information may include a mapping relationship between QoS flows and carriers and / or a mapping relationship between the target address and QoS flows. Based on the second configuration information, the carrier corresponding to the target address can be determined. For example, the carrier corresponding to the target address can be determined based on the mapping relationship between QoS flows and carriers and the mapping relationship between the target address and QoS flows. For example, the carrier corresponding to the target address can be determined based on the mapping relationship between QoS flows and carriers and the QoS flows associated with the target address. For example, the AS layer can take the union of the carriers corresponding to one or more QoS flows associated with the target address as the carrier corresponding to the target address. For example, the QoS flows may be associated with unicast services. For example, the higher layer may be the V2X layer.

[0101] For example, the target address associated with the first service a1 is b1. The target address b1 has three QoS flows from the higher layer: flow1, flow2, and flow3. The higher layer provides the following mapping relationship between QoS flows and carriers: (flow1, f1, f2, f3), (flow2, f1, f2, f3, f4), and (flow3, f2, f3, f4). The AS layer can obtain the mapping from the target address b1 to the carrier as (b1, f1, f2, f3, f4), which means that the carriers corresponding to the target address b1 are f1, f2, f3, and f4.

[0102] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the target address. The AS layer of the first terminal 101 can receive third configuration information sent by the higher layers of the first terminal 101. The third configuration information may include a mapping relationship between the first service and the target address and / or a mapping relationship between the first service and the carrier. Based on the third configuration information, the carrier corresponding to the target address can be determined. Exemplarily, the higher layer may be the V2X layer. Exemplarily, the first service may be a unicast service. Exemplarily, the first service may be one or more, and the AS layer may use the union of the carriers corresponding to one or more first services associated with the target address as the carrier corresponding to the target address.

[0103] For example, if the target address associated with the first services a1, a2, and a3 is b1, the carriers corresponding to the first service a1 are f1, f2, and f3, the carriers corresponding to the first service a2 are f1, f2, f3, and f4, and the carriers corresponding to the first service a3 are f2, f3, and f4, then the carriers corresponding to the target address b1 are f1, f2, f3, and f4.

[0104] In some embodiments, the first terminal 101 can acquire the carrier corresponding to the SL LCH that triggered carrier selection or reselection. Exemplarily, the SL LCH that triggered carrier selection or reselection is associated with a target address, and exemplarily, the SL LCH that triggered carrier selection or reselection has SL data to be transmitted to the target address. Exemplarily, the target address is associated with a first unicast connection, and the second terminal 102, whose target address is associated with the first unicast connection, is also associated with the first unicast connection.

[0105] In some embodiments, the first carrier is the carrier corresponding to the sidelink logical channel that has triggered carrier selection or reselection. The AS layer of the first terminal 101 can receive second configuration information sent by the higher layer of the first terminal 101. The second configuration information may include a mapping relationship between QoS streams and carriers. The first terminal 101 determines the mapping relationship between QoS streams and SL LCHs according to the sidelink radio bearer (SLRB) configuration. Combining the mapping relationship between QoS streams and carriers in the second configuration information, the mapping relationship between SL LCHs and carriers can be determined, thereby determining the carrier corresponding to the SL LCH that has triggered carrier selection or reselection.

[0106] In some embodiments, the first carrier is the carrier corresponding to the sidelink logical channel that has triggered carrier selection or reselection. The AS layer of the first terminal 101 can receive third configuration information sent by the higher layer of the first terminal 101. The third configuration information may include the mapping relationship between the first service and the carrier. The first terminal 101 can determine the mapping relationship between the first service and the SL LCH according to the configuration of the sidelink radio bearer. By combining the mapping relationship between the first service and the carrier in the third configuration information, the mapping relationship between the SL LCH and the carrier can be determined, and thus the carrier corresponding to the SL LCH that has triggered carrier selection or reselection can be determined.

[0107] In some embodiments, the carrier corresponding to the target address may be the same as or different from the carrier corresponding to the SL LCH that triggered selection or reselection. For example, the carriers corresponding to the target address b1 are f1, f2, f3, and f4, and there are three SL LCHs associated with the target address b1: L1, L2, and L3. Among them, the carriers corresponding to L1 are f1 and f2, the carriers corresponding to L2 are f3 and f4, and the carriers corresponding to L3 are f2, f3, and f4. If L1 triggers carrier selection or reselection, and the carriers corresponding to the SL LCH that triggered selection or reselection are f1 and f2, then the carrier corresponding to the target address is different from the carrier that triggered carrier selection or reselection. If both L1 and L2 trigger carrier selection or reselection, and the carriers corresponding to the SL LCH that triggered selection or reselection are f1, f2, f3, and f4, then the carrier corresponding to the target address is the same as the carrier that triggered carrier selection or reselection.

[0108] In some embodiments, the first terminal 101 may receive fifth configuration information sent by a network device, wherein the fifth configuration information may include a second carrier.

[0109] For example, if the first terminal 101 is in RRC connected state, the first terminal 101 can receive the fifth configuration information sent by the network device through dedicated signaling. For example, if the first terminal 101 is in RRC idle state or RRC sleep state, the first terminal 101 can receive the fifth configuration information sent by the network device through SIB. If the first terminal 101 is in OOC state, the first terminal 101 can obtain the fifth configuration information through pre-configuration. That is, if the first terminal 101 is in RRC connected state, it can obtain the second carrier configured by the network device through dedicated signaling; if the first terminal 101 is in RRC idle state or RRC sleep state, it can obtain the second carrier configured by the network device through SIB; and if the first terminal is in OOC state, it can obtain the second carrier through pre-configuration.

[0110] In some embodiments, the first terminal 101 may receive indication information sent by the second terminal 102, wherein the indication information may be used to indicate a fourth carrier supported by the second terminal 102. Exemplarily, the fourth carrier supported by the second terminal 102 may include carriers that the second terminal 102 supports for receiving and / or transmitting. Exemplarily, the second terminal 102 is a receiving terminal, and the fourth carrier supported by the receiving terminal may include carriers that the receiving terminal supports for receiving and / or transmitting.

[0111] In some embodiments, the first terminal 101 determines a carrier selection or reselection trigger, and the first terminal 101 determines an SL LCH that triggers the carrier selection or reselection. The first terminal 101 can select or reselect a fifth carrier associated with the first unicast connection based on at least one of a first carrier, a second carrier configured by the network device, a third carrier supported by the first terminal 101, and a fourth carrier supported by the second terminal 102. Exemplarily, the first carrier may be a carrier corresponding to the target address or a carrier corresponding to the SL LCH that triggered the carrier selection or reselection. Exemplarily, the third carrier supported by the first terminal 101 may include carriers that the first terminal 101 supports for transmission and / or reception.

[0112] In some embodiments, if the carrier corresponding to the target address is the same as the carrier corresponding to the SL LCH that triggered carrier selection or reselection, the first terminal 101 may select or reselect the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the target address, the second carrier, the third carrier, and the fourth carrier; or it may select or reselect the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the SL LCH that triggered carrier selection or reselection. If the carrier corresponding to the target address is not the same as the carrier corresponding to the SL LCH that triggered carrier selection or reselection, the first terminal 101 may select or reselect the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the SL LCH that triggered carrier selection or reselection.

[0113] In some embodiments, the first terminal 101 may select or reselect a fifth carrier associated with the first unicast connection based on the intersection of at least one of the first carrier, a second carrier configured by the network device, a third carrier supported by the first terminal 101, and a fourth carrier supported by the second terminal 102. For example, the first carrier may be the carrier corresponding to the target address or the carrier corresponding to the SL LCH that triggered carrier selection or reselection.

[0114] In some embodiments, the first terminal 101 may determine a first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier, and select or reselect a fifth carrier associated with the first unicast connection based on the first intersection. For example, the first terminal 101 may determine candidate carriers based on the first intersection, and then select or reselect a fifth carrier from the candidate carriers.

[0115] In some embodiments, the first terminal 101 can determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as the first intersection.

[0116] In some embodiments, the first terminal 101 may determine the carriers in the first intersection as the first candidate carriers, and then select or reselect a fifth carrier from the first candidate carriers. Exemplarily, the number of fifth carriers selected or reselected by the first terminal 101 from the first candidate carriers can be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected can be determined according to the capabilities of the first terminal 101.

[0117] In some embodiments, the first terminal 101 may identify carriers whose measured CBR in the first intersection is less than or equal to a first threshold as second candidate carriers, and then select or reselect a fifth carrier from the second candidate carriers. Exemplarily, the number of fifth carriers selected or reselected by the first terminal 101 from the second candidate carriers can be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected can be determined according to the capabilities of the first terminal 101.

[0118] In some embodiments, the first terminal 101 can determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as the first intersection, determine the carriers in the first intersection whose measured CBR is less than or equal to the first threshold as the second candidate carriers, and then select or reselect the fifth carrier from the second candidate carriers.

[0119] In some embodiments, the first terminal 101 can determine the first intersection of the first carrier, the second carrier, the carriers that the first terminal 101 supports transmitting from the third carrier, and the carriers that the second terminal 102 supports receiving from the fourth carrier. The carriers in the first intersection whose measured CBR is less than or equal to a first threshold are determined as second candidate carriers. Then, a fifth carrier is selected or reselected from the second candidate carriers. It is evident that the fifth carrier is the carrier corresponding to the target address or the SL LCH that triggered carrier selection or reselection, the carrier configured by the network device, or the carrier supported by the first terminal 101 and the second terminal. Furthermore, the measured CBR of the fifth carrier is less than or equal to the first threshold. Therefore, sending sidelink data to the second terminal 102 via the fifth carrier can reduce the packet loss rate and improve communication quality.

[0120] For example, if the first carrier is f1, f2, f3, f4, the second carrier is f2, f3, f4, f5, the third carrier is f3, f4, f5, and the fourth carrier is f2, f3, f4, then the first intersection is {f3, f4}. In the first intersection, the measured CBR of carriers f3 and f4 are both less than the first threshold, so carriers f3 and f4 can be determined as candidate carriers. Then, the fifth carrier can be selected or reselected from carriers f3 and f4. For example, carriers f3 and f4 can be selected or reselected, that is, the fifth carrier is carriers f3 and f4.

[0121] In some embodiments, the first terminal 101 can determine the intersection of carriers whose measured CBR is less than or equal to the first threshold in the first carrier, carriers whose measured CBR is less than or equal to the first threshold in the second carrier, carriers whose measured CBR is less than or equal to the first threshold in the third carrier, and carriers whose measured CBR is less than or equal to the first threshold in the fourth carrier as the first intersection, determine the carriers in the first intersection as the first candidate carriers, and then select or reselect the fifth carrier from the first candidate carriers.

[0122] In some embodiments, the first terminal 101 may determine a third candidate carrier as a carrier that simultaneously satisfies the conditions of the first carrier and the second carrier, namely, a measured CBR less than or equal to a first threshold, support by the first terminal 101, and support by the second terminal 102, and then select or reselect a fifth carrier from the third candidate carrier.

[0123] For example, the first carrier is f1, f2, f3, f4; the second carrier is f2, f3, f4, f5; the third carrier is f3, f4, f5; and the fourth carrier is f2, f3, f4. The intersection of the first and second carriers is {f2, f3, f4}. The carriers in this intersection that satisfy the condition that the measured CBR is less than or equal to the first threshold are f3 and f4. Carriers f3 and f4 are carriers supported by the first terminal 101 and also by the second terminal 102. Therefore, carriers f3 and f4 are determined as the third candidate carriers. Then, the fifth carrier is selected or reselected from carriers f3 and f4. For example, carriers f3 and f4 can be selected or reselected, that is, the fifth carrier is carriers f3 and f4.

[0124] In some embodiments, the first terminal 101 may receive first configuration information sent by a network device, wherein the first configuration information may include a first threshold.

[0125] For example, if the first terminal 101 is in RRC connected state, the first terminal 101 can receive the first configuration information sent by the network device through dedicated signaling. For example, if the first terminal 101 is in RRC idle state or RRC sleep state, the first terminal 101 can receive the first configuration information sent by the network device through SIB. If the first terminal 101 is in OOC state, the first terminal 101 can obtain the first configuration information through pre-configuration. That is, if the first terminal 101 is in RRC connected state, it can obtain the first threshold configured by the network device through dedicated signaling; if the first terminal 101 is in RRC idle state or RRC sleep state, it can obtain the first threshold configured by the network device through SIB; and if the first terminal is in OOC state, it can obtain the first threshold through pre-configuration.

[0126] In some embodiments, the first terminal 101 can obtain the correspondence between the priority of the SL LCH configured by the network device and the carrier selection or reselection CBR threshold. The first threshold may be the carrier selection or reselection CBR threshold corresponding to the priority of the SL LCH that has triggered carrier selection or reselection.

[0127] In some embodiments, terms such as "first," "certain," "preset," "default," "set," "indicated," "a certain," "any," and "any" can be used interchangeably. "First," "certain A," "preset A," "default A," "set A," "indicated A," "a certain A," "any A," and "any A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, any A, or first A, but are not limited thereto.

[0128] In step S2102, the first terminal 101 sends side link data to the second terminal 102.

[0129] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 via a selected or reselected fifth carrier associated with the first unicast connection.

[0130] In some embodiments, the second terminal 102 may receive sidelink data sent by the first terminal 101.

[0131] In some embodiments, the second terminal 102 can receive sidelink data sent by the first terminal 101 via the fifth carrier associated with the first unicast connection.

[0132] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transmit,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0133] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0134] In step S2103, the first terminal 101 counts the DTX based on HARQ feedback on the fifth carrier associated with the first unicast connection.

[0135] In some embodiments, the first terminal 101 performs a DTX count based on HARQ feedback on the selected or reselected fifth carrier associated with the first unicast connection.

[0136] In some embodiments, the fifth carrier associated with the first unicast connection may be multiple, and the DTX count based on HARQ feedback can be performed on each fifth carrier. For example, if the fifth carrier associated with the first unicast connection is carrier f3 and carrier f4, the DTX count based on HARQ feedback can be performed on carrier f3 and carrier f4 respectively to obtain the DTX count based on HARQ feedback for carrier f3 and the DTX count based on HARQ feedback for carrier f4.

[0137] In some embodiments, there are multiple fifth carriers associated with the first unicast connection. The first terminal 101 can detect SL HARQ feedback of the PSSCH at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on each fifth carrier. For each fifth carrier, if no SL HARQ feedback of the PSSCH is detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on that fifth carrier, the DTX count based on HARQ feedback corresponding to that fifth carrier associated with the first unicast connection is incremented by 1. If SL HARQ feedback of the PSSCH is detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on that fifth carrier, the DTX count based on HARQ feedback corresponding to that fifth carrier associated with the first unicast connection is reinitialized to 0. If the DTX count based on HARQ feedback corresponding to all fifth carriers associated with the first unicast connection reaches its maximum value, SL RLF is triggered.

[0138] For example, the fifth carriers associated with the first unicast connection are carriers f3 and f4. On carrier f3, the SL HARQ feedback of the PSSCH corresponding to the PSFCH associated with the first unicast connection is detected during the PSSCH timing. If no SL HARQ feedback is detected on carrier f3, the DTX count based on HARQ feedback for carrier f3 is incremented by 1. If SL HARQ feedback is detected on carrier f3, the DTX count based on HARQ feedback for carrier f3 is reinitialized to 0. Similarly, on carrier f4, the SL HARQ feedback of the PSSCH corresponding to the PSFCH associated with the first unicast connection is detected during the PSSCH timing. If no SL HARQ feedback is detected on carrier f4, the DTX count is reinitialized to 0. HARQ feedback increments the DTX count based on HARQ feedback for carrier f4 by 1. If SL HARQ feedback is detected on the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on carrier f4, the DTX count based on HARQ feedback for carrier f4 is reinitialized to 0. When the DTX counts based on HARQ feedback for both carrier f3 and carrier f4 reach their maximum values, SL RLF is triggered.

[0139] In some embodiments, if the counts of DTX based on HARQ feedback corresponding to the fifth carrier associated with the first unicast connection are all greater than a second threshold, it can be determined that the first unicast connection has experienced a HARQ feedback-based SL RLF. For example, "all greater than the second threshold" can be interchanged with "all reaching the maximum value" in the above example.

[0140] In some embodiments, the first terminal 101 may receive fourth configuration information sent by the network device, wherein the fourth configuration information may include a second threshold.

[0141] For example, if the first terminal 101 is in RRC connected state, the first terminal 101 can receive the fourth configuration information sent by the network device through dedicated signaling. For example, if the first terminal 101 is in RRC idle state or RRC sleep state, the first terminal 101 can receive the fourth configuration information sent by the network device through SIB. If the first terminal 101 is in OOC state, the first terminal 101 can obtain the fourth configuration information through pre-configuration. That is, if the first terminal 101 is in RRC connected state, it can obtain the second threshold configured by the network device through dedicated signaling; if the first terminal 101 is in RRC idle state or RRC sleep state, it can obtain the second threshold configured by the network device through SIB; and if the first terminal is in OOC state, it can obtain the second threshold through pre-configuration.

[0142] The DTX counting method based on HARQ feedback disclosed in this embodiment may include at least one of steps S2101 to S2103. For example, step S2101 may be implemented as an independent embodiment, step S2102 may be implemented as an independent embodiment, step S2103 may be implemented as an independent embodiment, steps S2101 and S2102 may be implemented as independent embodiments, and steps S2102 and S2103 may be implemented as independent embodiments, but are not limited thereto.

[0143] In some embodiments, step S2102 is optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0144] In this implementation or embodiment, unless there is contradiction, each step can be independent, arbitrarily combined or exchanged in order, optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other implementations or other embodiments.

[0145] Figure 3A This is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 3A As shown, this disclosure relates to a DTX counting method based on HARQ feedback for a first terminal 101. The method includes: Step S3101: Select or reselect the fifth carrier associated with the first unicast connection.

[0146] For optional implementations of step S3101, please refer to [link / reference]. Figure 2 Optional implementation methods of step S2101, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0147] Step S3102: Send side link data.

[0148] 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.

[0149] For optional implementations of step S3102, please refer to [link / reference]. Figure 2 Optional implementation methods of step S2102, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0150] Step S3103: Count the DTX based on HARQ feedback for the fifth carrier associated with the first unicast connection.

[0151] For optional implementations of step S3103, please refer to [link / reference]. Figure 2 Optional implementation methods of step S2102, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0152] In some embodiments, step S3102 is optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0153] The DTX counting method based on HARQ feedback disclosed in this embodiment 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, step S3103 may be implemented as an independent embodiment, steps S3101 and S3102 may be implemented as independent embodiments, and steps S3102 and S3103 may be implemented as independent embodiments, but are not limited thereto.

[0154] In this implementation method or embodiment, unless there is a contradiction, each step can be independent, arbitrarily combined or exchanged in order, and optional methods or optional examples can be arbitrarily combined.

[0155] Figure 3B This is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 3B As shown, this disclosure relates to a DTX counting method based on HARQ feedback for a first terminal 101. The method includes: Step S3201: The intersection of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal is determined as the first intersection.

[0156] For optional implementations of step S3201, please refer to [link / reference]. Figure 2 Step S2101 Figure 3A Optional implementation methods of step S3101, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0157] Step S3202: Select or reselect the fifth carrier based on the measured CBR of the first intersection carrier.

[0158] For optional implementations of step S3202, please refer to [link / reference]. Figure 2 Step S2101 Figure 3A Optional implementation methods of step S3101, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0159] Step S3203: Perform DTX counting on the fifth carrier based on HARQ feedback.

[0160] For optional implementations of step S3203, please refer to [link / reference]. Figure 2 Step S2103 Figure 3A Optional implementation methods of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0161] The DTX counting method based on HARQ feedback disclosed in this embodiment may include at least one of steps S3201 to S3203. For example, step S3201 may be implemented as a standalone embodiment, step S3202 may be implemented as a standalone embodiment, step S3203 may be implemented as a standalone embodiment, and steps S3201, S3202, and S3203 may be implemented as standalone embodiments, but are not limited thereto.

[0162] In this implementation method or embodiment, unless there is a contradiction, each step can be independent, arbitrarily combined or exchanged in order, and optional methods or optional examples can be arbitrarily combined.

[0163] Figure 3C This is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 3C As shown, this disclosure relates to a DTX counting method based on HARQ feedback for a first terminal 101. The method includes: Step S3301: Determine the first intersection of at least one of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal.

[0164] For optional implementations of step S3301, please refer to [link / reference]. Figure 2 Step S2101 Figure 3A Step S3101 Figure 3B Optional implementation methods of step S3201, and Figure 2 , Figure 3A , Figure 3B Other related parts in the embodiments involved will not be described in detail here.

[0165] Step S3302: Select or reselect the fifth carrier based on the first intersection.

[0166] For optional implementations of step S3302, please refer to [link / reference]. Figure 2 Step S2101 Figure 3A Optional implementation methods of step S3101, and Figure 2, Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0167] Step S3303: Perform DTX counting on the fifth carrier based on HARQ feedback.

[0168] For optional implementations of step S3303, please refer to [link / reference]. Figure 2 Step S2103 Figure 3A Optional implementation methods of step S3103, and Figure 2 , Figure 3A , Figure 3B Other related parts in the embodiments involved will not be described in detail here.

[0169] The DTX counting method based on HARQ feedback disclosed in this embodiment 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 S3301 and step S3302 may be implemented as independent embodiments, and steps S3301, S3302 and S3303 may be implemented as independent embodiments, but are not limited thereto.

[0170] In this implementation method or embodiment, unless there is a contradiction, each step can be independent, arbitrarily combined or exchanged in order, and optional methods or optional examples can be arbitrarily combined.

[0171] Figure 3D This is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 3D As shown, this disclosure relates to a DTX counting method based on HARQ feedback for a first terminal 101. The method includes: Step S3401: Select or reselect the fifth carrier associated with the first unicast connection based on at least one of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal.

[0172] In some embodiments, "carrier", "band", "spectrum" and "frequency" can be used interchangeably.

[0173] In some embodiments, the first unicast connection may be a unicast connection between the first terminal 101 and the second terminal 102.

[0174] In some embodiments, the first terminal 101 is a sending terminal and the second terminal 102 is a receiving terminal.

[0175] In some embodiments, the first carrier is the carrier corresponding to the target address, or the carrier corresponding to the SL LCH that triggered carrier selection or reselection. Exemplarily, the target address may be a destination L2 ID. Exemplarily, the target address or the carrier corresponding to the SL LCH that triggered carrier selection or reselection is associated with the first unicast connection, and the second terminal 102 associated with the target address and the first unicast connection.

[0176] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the target address. The access stratum (AS layer) of the first terminal 101 can receive second configuration information sent by the higher layer of the first terminal 101. The second configuration information may include a mapping relationship between QoS flows and carriers and / or a mapping relationship between the target address and QoS flows. Based on the second configuration information, the carrier corresponding to the target address can be determined. For example, the carrier corresponding to the target address can be determined based on the mapping relationship between QoS flows and carriers and the mapping relationship between the target address and QoS flows. For example, the carrier corresponding to the target address can be determined based on the mapping relationship between QoS flows and carriers and the QoS flows associated with the target address. For example, the AS layer can take the union of the carriers corresponding to one or more QoS flows associated with the target address as the carrier corresponding to the target address. For example, the QoS flows may be associated with unicast services. For example, the higher layer may be the V2X layer.

[0177] For example, the target address associated with the first service a1 is b1. The target address b1 has three QoS flows from the higher layer: flow1, flow2, and flow3. The higher layer provides the following mapping relationship between QoS flows and carriers: (flow1, f1, f2, f3), (flow2, f1, f2, f3, f4), and (flow3, f2, f3, f4). The AS layer can obtain the mapping from the target address b1 to the carrier as (b1, f1, f2, f3, f4), which means that the carriers corresponding to the target address b1 are f1, f2, f3, and f4.

[0178] In some embodiments, the AS layer of the first terminal 101 can receive third configuration information sent by the higher layer of the first terminal 101. The third configuration information may include a mapping relationship between a first service and a target address and / or a mapping relationship between the first service and a carrier. Based on the third configuration information, the carrier corresponding to the target address can be determined. Exemplarily, the higher layer may be the V2X layer. Exemplarily, the first service may be a unicast service. Exemplarily, the first service may be one or more, and the AS layer may use the union of the carriers corresponding to one or more first services associated with the target address as the carrier corresponding to the target address.

[0179] For example, if the target address associated with the first services a1, a2, and a3 is b1, the carriers corresponding to the first service a1 are f1, f2, and f3, the carriers corresponding to the first service a2 are f1, f2, f3, and f4, and the carriers corresponding to the first service a3 are f2, f3, and f4, then the carriers corresponding to the target address b1 are f1, f2, f3, and f4.

[0180] In some embodiments, the first terminal 101 can acquire the carrier corresponding to the SL LCH that triggered carrier selection or reselection. Exemplarily, the SL LCH that triggered carrier selection or reselection is associated with a target address, and exemplarily, the SL LCH that triggered carrier selection or reselection has SL data to be transmitted to the target address. Exemplarily, the target address is associated with a first unicast connection, and the second terminal 102, whose target address is associated with the first unicast connection, is also associated with the first unicast connection.

[0181] In some embodiments, the first carrier is the carrier corresponding to the sidelink logical channel that has triggered carrier selection or reselection. The AS layer of the first terminal 101 can receive the second configuration information sent by the higher layer of the first terminal 101. The second configuration information may include the mapping relationship between QoS streams and carriers. The first terminal 101 determines the mapping relationship between QoS streams and SL LCHs according to the SL RB configuration. Combining the mapping relationship between QoS streams and carriers in the second configuration information, the mapping relationship between SL LCHs and carriers can be determined, thereby determining the carrier corresponding to the SL LCH that has triggered carrier selection or reselection.

[0182] In some embodiments, the first carrier is the carrier corresponding to the side link logical channel that has triggered carrier selection or reselection. The AS layer of the first terminal 101 can receive third configuration information sent by the higher layer of the first terminal 101. The third configuration information may include the mapping relationship between the first service and the carrier. The first terminal 101 can determine the mapping relationship between the first service and the SLLCH according to the configuration of the SLL RB. Combining the mapping relationship between the first service and the carrier in the third configuration information, the mapping relationship between the SLLCH and the carrier can be determined, and then the carrier corresponding to the SLLCH that has triggered carrier selection or reselection can be determined.

[0183] In some embodiments, the carrier corresponding to the target address may be the same as or different from the carrier corresponding to the SL LCH that triggered selection or reselection. For example, the carriers corresponding to the target address b1 are f1, f2, f3, and f4, and there are three SL LCHs associated with the target address b1: L1, L2, and L3. Among them, the carriers corresponding to L1 are f1 and f2, the carriers corresponding to L2 are f3 and f4, and the carriers corresponding to L3 are f2, f3, and f4. If L1 triggers carrier selection or reselection, and the carriers corresponding to the SL LCH that triggered selection or reselection are f1 and f2, then the carrier corresponding to the target address is different from the carrier that triggered carrier selection or reselection. If both L1 and L2 trigger carrier selection or reselection, and the carriers corresponding to the SL LCH that triggered selection or reselection are f1, f2, f3, and f4, then the carrier corresponding to the target address is the same as the carrier that triggered carrier selection or reselection.

[0184] In some embodiments, the first terminal 101 may receive fifth configuration information sent by a network device, wherein the fifth configuration information may include a second carrier.

[0185] For example, if the first terminal 101 is in RRC connected state, the first terminal 101 can receive the fifth configuration information sent by the network device through dedicated signaling. For example, if the first terminal 101 is in RRC idle state or RRC sleep state, the first terminal 101 can receive the fifth configuration information sent by the network device through SIB. If the first terminal 101 is in OOC state, the first terminal 101 can obtain the fifth configuration information through pre-configuration. That is, if the first terminal 101 is in RRC connected state, it can obtain the second carrier configured by the network device through dedicated signaling; if the first terminal 101 is in RRC idle state or RRC sleep state, it can obtain the second carrier configured by the network device through SIB; and if the first terminal is in OOC state, it can obtain the second carrier through pre-configuration.

[0186] In some embodiments, the first terminal 101 may receive indication information sent by the second terminal 102, wherein the indication information may be used to indicate a fourth carrier supported by the second terminal 102. Exemplarily, the fourth carrier supported by the second terminal 102 may include carriers that the second terminal 102 supports for receiving and / or transmitting. Exemplarily, the second terminal 102 is a receiving terminal, and the fourth carrier supported by the receiving terminal may include carriers that the receiving terminal supports for receiving and / or transmitting.

[0187] In some embodiments, the first terminal 101 determines a carrier selection or reselection trigger, and the first terminal 101 determines an SL LCH that triggers the carrier selection or reselection. The first terminal 101 can select or reselect a fifth carrier associated with the first unicast connection based on at least one of a first carrier, a second carrier configured by the network device, a third carrier supported by the first terminal 101, and a fourth carrier supported by the second terminal 102. Exemplarily, the first carrier may be a carrier corresponding to the target address or a carrier corresponding to the SL LCH that triggered the carrier selection or reselection. Exemplarily, the third carrier supported by the first terminal 101 may include carriers that the first terminal 101 supports for transmission and / or reception.

[0188] In some embodiments, if the carrier corresponding to the target address is the same as the carrier corresponding to the SL LCH that triggered carrier selection or reselection, the first terminal 101 may select or reselect the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the target address, the second carrier, the third carrier, and the fourth carrier; or it may select or reselect the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the SL LCH that triggered carrier selection or reselection. If the carrier corresponding to the target address is not the same as the carrier corresponding to the SL LCH that triggered carrier selection or reselection, the first terminal 101 may select or reselect the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the SL LCH that triggered carrier selection or reselection.

[0189] In some embodiments, the first terminal 101 may select or reselect a fifth carrier associated with the first unicast connection based on the intersection of at least one of the first carrier, a second carrier configured by the network device, a third carrier supported by the first terminal 101, and a fourth carrier supported by the second terminal 102. For example, the first carrier may be the carrier corresponding to the target address or the carrier corresponding to the SL LCH that triggered carrier selection or reselection.

[0190] In some embodiments, the first terminal 101 may determine a first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier, and select or reselect a fifth carrier associated with the first unicast connection based on the first intersection. For example, the first terminal 101 may determine candidate carriers based on the first intersection, and then select or reselect a fifth carrier from the candidate carriers.

[0191] In some embodiments, the first terminal 101 can determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as the first intersection.

[0192] In some embodiments, the first terminal 101 may determine the carriers in the first intersection as the first candidate carriers, and then select or reselect a fifth carrier from the first candidate carriers. Exemplarily, the number of fifth carriers selected or reselected by the first terminal 101 from the first candidate carriers can be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected can be determined according to the capabilities of the first terminal 101.

[0193] In some embodiments, the first terminal 101 may identify carriers whose measured CBR in the first intersection is less than or equal to a first threshold as second candidate carriers, and then select or reselect a fifth carrier from the second candidate carriers. Exemplarily, the number of fifth carriers selected or reselected by the first terminal 101 from the second candidate carriers can be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected can be determined according to the capabilities of the first terminal 101.

[0194] In some embodiments, the first terminal 101 can determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as the first intersection, determine the carriers in the first intersection whose measured CBR is less than or equal to the first threshold as the second candidate carriers, and then select or reselect the fifth carrier from the second candidate carriers.

[0195] In some embodiments, the first terminal 101 can determine the first intersection of the first carrier, the second carrier, the carriers that the first terminal 101 supports transmitting from the third carrier, and the carriers that the second terminal 102 supports receiving from the fourth carrier. The carriers in the first intersection whose measured CBR is less than or equal to a first threshold are determined as second candidate carriers. Then, a fifth carrier is selected or reselected from the second candidate carriers. It is evident that the fifth carrier is the carrier corresponding to the target address or the SL LCH that triggered carrier selection or reselection, the carrier configured by the network device, or the carrier supported by the first terminal 101 and the second terminal. Furthermore, the measured CBR of the fifth carrier is less than or equal to the first threshold. Therefore, sending sidelink data to the second terminal 102 via the fifth carrier can reduce the packet loss rate and improve communication quality.

[0196] For example, if the first carrier is f1, f2, f3, f4, the second carrier is f2, f3, f4, f5, the third carrier is f3, f4, f5, and the fourth carrier is f2, f3, f4, then the first intersection is {f3, f4}. In the first intersection, the measured CBR of carriers f3 and f4 are both less than the first threshold, so carriers f3 and f4 can be determined as candidate carriers. Then, the fifth carrier can be selected or reselected from carriers f3 and f4. For example, carriers f3 and f4 can be selected or reselected, that is, the fifth carrier is carriers f3 and f4.

[0197] In some embodiments, the first terminal 101 can determine the intersection of carriers whose measured CBR is less than or equal to the first threshold in the first carrier, carriers whose measured CBR is less than or equal to the first threshold in the second carrier, carriers whose measured CBR is less than or equal to the first threshold in the third carrier, and carriers whose measured CBR is less than or equal to the first threshold in the fourth carrier as the first intersection, determine the carriers in the first intersection as the first candidate carriers, and then select or reselect the fifth carrier from the first candidate carriers.

[0198] In some embodiments, the first terminal 101 may determine a third candidate carrier as a carrier that simultaneously satisfies the conditions of the first carrier and the second carrier, namely, a measured CBR less than or equal to a first threshold, support by the first terminal 101, and support by the second terminal 102, and then select or reselect a fifth carrier from the third candidate carrier.

[0199] For example, the first carrier is f1, f2, f3, f4; the second carrier is f2, f3, f4, f5; the third carrier is f3, f4, f5; and the fourth carrier is f2, f3, f4. The intersection of the first and second carriers is {f2, f3, f4}. The carriers in this intersection that satisfy the condition that the measured CBR is less than or equal to the first threshold are f3 and f4. Carriers f3 and f4 are carriers supported by the first terminal 101 and also by the second terminal 102. Therefore, carriers f3 and f4 are determined as the third candidate carriers. Then, the fifth carrier is selected or reselected from carriers f3 and f4. For example, carriers f3 and f4 can be selected or reselected, that is, the fifth carrier is carriers f3 and f4.

[0200] In some embodiments, the first terminal 101 may receive first configuration information sent by a network device, wherein the first configuration information may include a first threshold.

[0201] For example, if the first terminal 101 is in RRC connected state, the first terminal 101 can receive the first configuration information sent by the network device through dedicated signaling. For example, if the first terminal 101 is in RRC idle state or RRC sleep state, the first terminal 101 can receive the first configuration information sent by the network device through SIB. If the first terminal 101 is in OOC state, the first terminal 101 can obtain the first configuration information through pre-configuration. That is, if the first terminal 101 is in RRC connected state, it can obtain the first threshold configured by the network device through dedicated signaling; if the first terminal 101 is in RRC idle state or RRC sleep state, it can obtain the first threshold configured by the network device through SIB; and if the first terminal is in OOC state, it can obtain the first threshold through pre-configuration.

[0202] In some embodiments, the first terminal 101 can obtain the correspondence between the priority of the SL LCH configured by the network device and the carrier selection or reselection CBR threshold. The first threshold may be the carrier selection or reselection CBR threshold corresponding to the priority of the SL LCH that has triggered carrier selection or reselection.

[0203] In some embodiments, terms such as "first," "certain," "preset," "default," "set," "indicated," "a certain," "any," and "any" can be used interchangeably. "First," "certain A," "preset A," "default A," "set A," "indicated A," "a certain A," "any A," and "any A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, any A, or first A, but are not limited thereto.

[0204] Step S3402: Perform DTX counting on the fifth carrier based on HARQ feedback.

[0205] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 via a selected or reselected fifth carrier associated with the first unicast connection.

[0206] In some embodiments, the second terminal 102 may receive sidelink data sent by the first terminal 101.

[0207] In some embodiments, the second terminal 102 can receive sidelink data sent by the first terminal 101 via the fifth carrier associated with the first unicast connection.

[0208] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transmit,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0209] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0210] In some embodiments, the first terminal 101 may perform a DTX count based on HARQ feedback on the selected or reselected fifth carrier associated with the first unicast connection.

[0211] In some embodiments, the fifth carrier associated with the first unicast connection may be multiple, and the DTX count based on HARQ feedback can be performed on each fifth carrier. For example, if the fifth carrier associated with the first unicast connection is carrier f3 and carrier f4, the DTX count based on HARQ feedback can be performed on carrier f3 and carrier f4 respectively to obtain the DTX count based on HARQ feedback for carrier f3 and the DTX count based on HARQ feedback for carrier f4.

[0212] In some embodiments, there are multiple fifth carriers associated with the first unicast connection. The first terminal 101 can detect SL HARQ feedback of the PSSCH at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on each fifth carrier. For each fifth carrier, if no SL HARQ feedback of the PSSCH is detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on that fifth carrier, the DTX count based on HARQ feedback corresponding to that fifth carrier associated with the first unicast connection is incremented by 1. If SL HARQ feedback of the PSSCH is detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on that fifth carrier, the DTX count based on HARQ feedback corresponding to that fifth carrier associated with the first unicast connection is reinitialized to 0. If the DTX count based on HARQ feedback corresponding to all fifth carriers associated with the first unicast connection reaches its maximum value, SL RLF is triggered.

[0213] For example, the fifth carriers associated with the first unicast connection are carriers f3 and f4. On carrier f3, the SL HARQ feedback of the PSSCH corresponding to the PSFCH associated with the first unicast connection is detected during the PSSCH timing. If no SL HARQ feedback is detected on carrier f3, the DTX count based on HARQ feedback for carrier f3 is incremented by 1. If SL HARQ feedback is detected on carrier f3, the DTX count based on HARQ feedback for carrier f3 is reinitialized to 0. Similarly, on carrier f4, the SL HARQ feedback of the PSSCH corresponding to the PSFCH associated with the first unicast connection is detected during the PSSCH timing. If no SL HARQ feedback is detected on carrier f4, the DTX count is reinitialized to 0. HARQ feedback increments the DTX count based on HARQ feedback for carrier f4 by 1. If SL HARQ feedback is detected on the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on carrier f4, the DTX count based on HARQ feedback for carrier f4 is reinitialized to 0. When the DTX counts based on HARQ feedback for both carrier f3 and carrier f4 reach their maximum values, SL RLF is triggered.

[0214] In some embodiments, if the counts of DTX based on HARQ feedback corresponding to the fifth carrier associated with the first unicast connection are all greater than a second threshold, it can be determined that the first unicast connection has experienced a HARQ feedback-based SL RLF. For example, "all greater than the second threshold" can be interchanged with "all reaching the maximum value" in the above example.

[0215] In some embodiments, the first terminal 101 may receive fourth configuration information sent by the network device, wherein the fourth configuration information may include a second threshold.

[0216] For example, if the first terminal 101 is in RRC connected state, the first terminal 101 can receive the fourth configuration information sent by the network device through dedicated signaling. For example, if the first terminal 101 is in RRC idle state or RRC sleep state, the first terminal 101 can receive the fourth configuration information sent by the network device through SIB. If the first terminal 101 is in OOC state, the first terminal 101 can obtain the fourth configuration information through pre-configuration. That is, if the first terminal 101 is in RRC connected state, it can obtain the second threshold configured by the network device through dedicated signaling; if the first terminal 101 is in RRC idle state or RRC sleep state, it can obtain the second threshold configured by the network device through SIB; and if the first terminal is in OOC state, it can obtain the second threshold through pre-configuration.

[0217] The DTX counting method based on HARQ feedback disclosed in this embodiment may include at least one of steps S3401 to S3402. For example, step S3401 may be implemented as a standalone embodiment, step S3402 may be implemented as a standalone embodiment, and so on, but are not limited to these.

[0218] In this implementation method or embodiment, unless there is a contradiction, each step can be independent, arbitrarily combined or exchanged in order, and optional methods or optional examples can be arbitrarily combined.

[0219] Figure 4 This is a flowchart illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 4 As shown, this disclosure relates to a DTX counting method based on HARQ feedback for a second terminal 102. The method includes: Step S4101: Obtain side link data.

[0220] In some embodiments, the second terminal 102 may receive sidelink data sent by the first terminal 101, but is not limited thereto, and may also receive sidelink data sent by other entities.

[0221] For optional implementations of step S4101, please refer to [link to relevant documentation]. Figure 2 Optional implementation methods of step S2102, and Figure 2 Other related parts in the embodiments involved.

[0222] In this implementation or embodiment, optional methods or examples can be combined arbitrarily without contradiction.

[0223] Figure 5 This is an interactive schematic diagram illustrating a DTX counting method based on HARQ feedback according to an embodiment of this disclosure. Figure 5 As shown, this disclosure relates to a DTX counting method based on HARQ feedback, used in a communication system 100. The communication system 100 includes a first terminal 101 and a second terminal 102. The method includes: In step S5101, the first terminal 101 selects or reselects the fifth carrier associated with the first unicast connection based on at least one of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal.

[0224] For optional implementations of step S5101, please refer to [link / reference]. Figure 2 Optional implementation methods of step S2101, and Figure 2 Other related parts in the embodiments involved.

[0225] Step S5102: Perform DTX counting on the fifth carrier based on HARQ feedback.

[0226] Optional implementations of step S5102 can be found in [reference]. Figure 2 Optional implementation methods of step S2103, and Figure 2 Other related parts in the embodiments involved.

[0227] In some embodiments, the above method may include the method described in the embodiments of the communication system side, the first terminal side, the second terminal side, etc., which will not be repeated here.

[0228] In this implementation or embodiment, unless there is contradiction, each step can be independent, arbitrarily combined or exchanged in order, optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other implementations or other embodiments.

[0229] The following is an exemplary description of the above method.

[0230] Optional implementation: Perform DTX counting based on HARQ feedback on the intersection of the carrier / band configured by the higher layer, the carrier / band configured by the network device, and the carrier / band selected (reselected) by the transmitting terminal.

[0231] Example 1: The higher layer provides the AS layer with a service-to-frequency mapping and a service-to-destination L2 ID mapping. For example, the higher layer provides the AS layer with a QoS flow-to-frequency mapping. The AS layer can obtain the L2 ID-to-frequency mapping. For example, this L2 ID is associated with the first unicast connection. For example, this L2 ID is associated with the receiving terminal of the first unicast connection. For example, the higher layer is the V2X layer. For instance, for L2 address A, which is associated with the first unicast connection, three QoS flows come from the higher layer. The higher layer provides the following QoS flow-to-frequency mappings: (flow1, f1, f2, f3), (flow2, f1, f2, f3, f4), (flow3, f2, f3, f4). The AS layer obtains the mapping from address A to frequency as (A, f1, f2, f3, f4).

[0232] Example 2: The carrier / frequency band configured by the network device. For example, the transmitting terminal in the RRC connected state obtains the carrier / frequency band configured by the network through dedicated signaling. For example, the transmitting terminal in the RRC IDLE / INACTIVE state obtains the carrier / frequency band configured by the network through SIB. For example, the transmitting terminal in the OOC state obtains the carrier / frequency band configured by the network through pre-configuration.

[0233] Example 3: The carrier selected by the transmitting terminal is one or more carriers selected based on the Carrier Measurement Backbone (CBR) and / or the carriers supported by the transmitting terminal and / or the carriers supported by the receiving terminal. Exemplarily, the carriers / frequency bands supported by the transmitting terminal refer to the carriers / frequency bands that the transmitting terminal supports for transmission and / or reception. Exemplarily, the carriers / frequency bands supported by the receiving terminal refer to the intersection of the carriers / frequency bands supported by the transmitting terminal and the carriers / frequency bands supported by the receiving terminal, such as the intersection of the carriers / frequency bands that the transmitting terminal supports for transmission and the carriers / frequency bands that the receiving terminal supports for reception.

[0234] Optionally, if the measured CBR of a carrier is less than or equal to the CBR threshold, and multiple carriers have measured CBRs less than or equal to the CBR threshold, the terminal device selects a carrier from the multiple carriers in ascending order of CBR.

[0235] Example 4: For the first unicast connection, the transmitting terminal performs DTX counting based on HARQ feedback on the intersection of the carriers / bands configured by the higher layer, the carriers / bands configured by the network device, and the carriers / bands selected (reselected) by the transmitting terminal. For example, for Layer 2 address A, the AS layer determines the carriers / bands mapped to Layer 2 address A as (f1, f2, f3, f4). According to Example 2, the carriers / bands configured by the network device are determined to be (f2, f3, f4, f5). According to Example 3, the carriers selected based on CBR and / or the carriers supported by the transmitting terminal and / or the carriers supported by the receiving terminal are f3, f4, and f6. For the first unicast connection, the transmitting terminal performs DTX counting based on HARQ feedback on carriers f3 and f4.

[0236] Option Implementation: The transmitting terminal selects (reselects) the carrier / band associated with this PC5-RRC connection to perform DTX counting based on HARQ feedback.

[0237] Optionally, when selecting a carrier, the transmitting terminal considers not only the CBR and / or the carriers supported by the transmitting terminal and / or the carriers supported by the receiving terminal, but also the carriers / bands configured by higher layers and the carriers / bands configured by the network device. Based on these intersections, the transmitting terminal selects or reselects a carrier, and performs DTX counting based on HARQ feedback on the carrier associated with this PC5-RRC connection. For example, for Layer 2 address A, the AS layer determines the carriers / bands mapped to Layer 2 address A as (f1, f2, f3, f4). According to Embodiment 2, the carriers / bands configured by the network device are determined to be (f2, f3, f4, f5). In Embodiment 3, when selecting or reselecting a carrier, the carriers selected from f2, f3, and f4 that have a measured CBR less than or equal to a preset CBR threshold, are carriers supported by the transmitting terminal, and are carriers supported by the receiving terminal, are determined as f3 and f4. f3 and f4 are associated with the PC5-RRC connection of the transmitting terminal and the receiving terminal, and the transmitting terminal performs DTX counting based on HARQ feedback on f3 and f4.

[0238] For example, DTX counting based on HARQ feedback is performed on the carrier associated with this L2 ID or PC5-RRC connection selected (reselected) by the UE.

[0239] It should be noted that in this disclosure, the DTX count based on HARQ feedback and the DTX number based on HARQ feedback can be interchanged.

[0240] In the embodiments disclosed herein, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations in other embodiments.

[0241] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0242] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC), and the functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD), such as a field-programmable gate array (FPGA), which can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0243] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0244] Figure 6 This is a schematic diagram of the structure of the first terminal proposed in an embodiment of this disclosure. Figure 6As shown, the first terminal 6100 may include at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the processing module is configured to select or reselect a fifth carrier associated with the first unicast connection based on at least one of a first carrier, a second carrier configured by the network device, a third carrier supported by the first terminal, and a fourth carrier supported by the second terminal; and to perform DTX counting on the fifth carrier based on HARQ feedback; wherein the first carrier is a carrier corresponding to a target address or a carrier corresponding to a sidelink logical channel (SL LCH) that has triggered carrier selection or reselection, the target address or the SL LCH that has triggered carrier selection or reselection is associated with the first unicast connection, and the first unicast connection is a unicast connection between the first terminal and the second terminal. Optionally, the transceiver module is configured to receive first configuration information sent by the network device, wherein the first configuration information includes the first threshold. Optionally, the transceiver module is configured to perform at least one of the communication steps (e.g., step S2102, but not limited thereto) performed by the first terminal 101 in any of the above methods, which will not be elaborated here. Optionally, the above processing module is used to execute at least one of the other steps (such as step S2101, but not limited thereto) executed by the first terminal 101 in any of the above methods, which will not be described in detail here.

[0245] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver.

[0246] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module. Optionally, the processing module may be interchangeable with a processor.

[0247] Figure 7A This is a schematic diagram of the structure of the communication device 7100 proposed in this embodiment. The communication device 7100 can be a network device (e.g., access network device, core network device, etc.), a terminal (e.g., user equipment, etc.), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 7100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0248] like Figure 7AAs shown, the communication device 7100 includes one or more processors 7101. The processor 7101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. The communication device 7100 is used to execute any of the above methods.

[0249] In some embodiments, the communication device 7100 further includes one or more memories 7102 for storing instructions. Optionally, all or part of the memories 7102 may also be located outside the communication device 7100.

[0250] 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 transceivers 7103 perform at least one of the communication steps such as sending and / or receiving in the above method (e.g., step S2102, but not limited thereto), and the processor 7101 performs at least one of the other steps (e.g., step S2101, but not limited thereto).

[0251] In some embodiments, a transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., may be used interchangeably.

[0252] 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 can be used to receive signals from the memory 7102 or other devices, and can be used to send signals to the memory 7102 or other devices. For example, the interface circuit 7104 can read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0253] 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 this disclosure is not limited thereto, and the structure of the communication device 7100 may vary. Figure 7AThe limitations. The communication device can be a standalone device or part of a larger device. For example, the communication device can be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally including storage components 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, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0254] Figure 7B This is a schematic diagram of the structure of chip 7200 according to an embodiment of this disclosure. For cases where the communication device 7100 can be a chip or a chip system, please refer to... Figure 7B The diagram shown is a schematic representation of the structure of chip 7200, but it is not limited to this.

[0255] Chip 7200 includes one or more processors 7201, which are used to perform any of the above methods.

[0256] In some embodiments, chip 7200 further includes one or more interface circuits 7202. Optionally, the interface circuit 7202 is connected to memory 7203, and the interface circuit 7202 can be used to receive signals from memory 7203 or other devices, and the interface circuit 7202 can be used to send signals to memory 7203 or other devices. For example, the interface circuit 7202 can read instructions stored in memory 7203 and send the instructions to processor 7201.

[0257] 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 (e.g., step S2102, but not limited thereto), and the processor 7201 performs at least one of the other steps (e.g., step S2101, but not limited thereto).

[0258] In some embodiments, the terms interface circuit, interface, transceiver pin, transceiver, etc., can be used interchangeably.

[0259] In some embodiments, chip 7200 further includes one or more memories 7203 for storing instructions. Optionally, all or part of the memories 7203 may be located outside of chip 7200.

[0260] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 7100, cause the communication device 7100 to perform 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 not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0261] This disclosure also provides a program product that, when executed by the communication device 7100, causes the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0262] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A counting method for discontinuous reception DTX based on Hybrid Automatic Repeat Request (HARQ) feedback, characterized in that, The method, executed by a first terminal, includes: The intersection of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal is determined as the first intersection; Carriers whose channel occupancy rate (CBR) in the first intersection is less than or equal to the first threshold are identified as first candidate carriers. Select or reselect the fifth carrier associated with the first unicast connection from the first candidate carrier; Perform DTX counting based on HARQ feedback on the fifth carrier; Wherein, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that has triggered carrier selection or reselection, the target address or the SL LCH that has triggered carrier selection or reselection is associated with the first unicast connection, and the first unicast connection is a unicast connection between the first terminal and the second terminal. The method further includes: The system receives second configuration information from the higher layer of the first terminal. The second configuration information includes a mapping relationship between the Quality of Service (QoS) flow and the carrier, and / or a mapping relationship between the target address and the QoS flow. The QoS flow is associated with a unicast service. The first carrier is determined based on the second configuration information; The step of performing DTX counting based on HARQ feedback on the fifth carrier includes: On each of the fifth carriers, the physical side link feedback channel (PSFCH) corresponding to the physical side link shared channel (PSSCH) associated with the first unicast connection is detected at the SL HARQ feedback of the PSSCH. If no SL HARQ feedback of the PSSCH is detected at the PSFCH timing, increment the DTX count based on HARQ feedback for each of the fifth carriers associated with the first unicast connection by 1; When the SL HARQ feedback of the PSSCH is detected at the PSFCH timing, the DTX count based on HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection is reinitialized to 0.

2. The method as described in claim 1, characterized in that, Also includes: The system receives first configuration information sent by the network device, wherein the first configuration information includes the first threshold.

3. The method as described in claim 2, characterized in that, The first configuration information received from the network device includes any one of the following: The first terminal receives the first configuration information sent by the network device via dedicated signaling, and is in the Radio Resource Control (RRC) connected state; The first terminal receives the first configuration information sent by the network device through the System Message Block (SIB), and is in RRC idle state or RRC sleep state. The first configuration information is obtained through pre-configuration, and the first terminal is out of coverage and OOC.

4. The method according to any one of claims 1-3, characterized in that, Also includes: The third configuration information received from the higher layer of the first terminal includes a mapping relationship between the first service and the target address and / or a mapping relationship between the first service and the carrier, wherein the first service is a unicast service. The first carrier is determined based on the third configuration information.

5. The method according to any one of claims 1-3, characterized in that, The third carrier is a carrier that the first terminal supports for transmission and / or reception, and the fourth carrier is a carrier that the second terminal supports for reception and / or transmission.

6. The method according to any one of claims 1-3, characterized in that, Also includes: If the DTX counts based on HARQ feedback corresponding to the fifth carrier are all greater than or equal to the second threshold, it is determined that the first unicast connection has experienced a sidelink radio link failure (SL RLF) based on HARQ feedback.

7. The method as described in claim 6, characterized in that, Also includes: The network device receives fourth configuration information, wherein the fourth configuration information includes the second threshold.

8. The method as described in claim 7, characterized in that, The receipt of the fourth configuration information sent by the network device includes any one of the following: The first terminal receives the fourth configuration information sent by the network device via dedicated signaling, and is in RRC connection state; The first terminal receives the fourth configuration information sent by the network device via SIB, and is in RRC idle state or RRC sleep state. The fourth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

9. The method according to any one of claims 1-3, characterized in that, Also includes: The system receives indication information sent by the second terminal, wherein the indication information is used to indicate the fourth carrier supported by the second terminal.

10. The method according to any one of claims 1-3, characterized in that, Also includes: The network device receives fifth configuration information, wherein the fifth configuration information includes the second carrier.

11. The method as described in claim 10, characterized in that, The receipt of the fifth configuration information sent by the network device includes any one of the following: The first terminal receives the fifth configuration information sent by the network device via dedicated signaling, and is in RRC connection state; The first terminal receives the fifth configuration information sent by the network device via SIB, and is in RRC idle state or RRC sleep state. The fifth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

12. A first terminal, characterized in that, include: The processing module is configured to determine the intersection of the first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal, and the fourth carrier supported by the second terminal as a first intersection; determine the carriers in the first intersection whose measured channel occupancy rate (CBR) is less than or equal to a first threshold as first candidate carriers; and select or reselect the fifth carrier associated with the first unicast connection from the first candidate carriers. Perform DTX counting based on HARQ feedback on the fifth carrier; Wherein, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that has triggered carrier selection or reselection, the target address or the SL LCH that has triggered carrier selection or reselection is associated with the first unicast connection, and the first unicast connection is a unicast connection between the first terminal and the second terminal. The first terminal is further configured to: receive second configuration information from a higher layer of the first terminal, the second configuration information including a mapping relationship between a Quality of Service (QoS) flow and a carrier and / or a mapping relationship between the target address and the QoS flow, wherein the QoS flow is associated with a unicast service; and determine the first carrier according to the second configuration information; The processing module is further configured to: On each of the fifth carriers, the physical side link feedback channel (PSFCH) corresponding to the physical side link shared channel (PSSCH) associated with the first unicast connection is detected at the SL HARQ feedback of the PSSCH. If no SL HARQ feedback of the PSSCH is detected at the PSFCH timing, increment the DTX count based on HARQ feedback for each of the fifth carriers associated with the first unicast connection by 1; When the SL HARQ feedback of the PSSCH is detected at the PSFCH timing, the DTX count based on HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection is reinitialized to 0.

13. A first terminal, characterized in that, include: One or more processors; The first terminal is used to execute the DTX counting method based on HARQ feedback as described in any one of claims 1-11.

14. A communication system, characterized in that, The device includes a terminal, wherein the first terminal is configured to implement the DTX counting method based on HARQ feedback as described in any one of claims 1-11.

15. A storage medium storing instructions, characterized in that, When the instruction is executed on the communication device, the communication device performs the DTX counting method based on HARQ feedback as described in any one of claims 1-11.

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