HARQ feedback-based DTX counting method, and terminal

Abstract

The present disclosure relates to an HARQ feedback-based DTX counting method, and a terminal. The method comprises: on the basis of 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, selecting or reselecting a fifth carrier associated with a first unicast connection; and performing HARQ feedback-based DTX counting 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) that triggers 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. Therefore, in an SL carrier aggregation scenario, a sending terminal performs HARQ feedback-based DTX counting on the selected or reselected carrier, so that resources can be saved; and sidelink data is sent to a receiving terminal by means of the selected or reselected carrier, so that the loss rate of a data packet can be reduced, and the communication quality is improved.

Description

DTX counting method and terminal based on HARQ feedback Technical Field

[0001] The present 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 Art

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

[0003] Summary of the Invention

[0004] The method disclosed in the present invention can be used to solve the technical problem of "which carriers are counted for DTX based on HARQ feedback in the SL carrier aggregation scenario".

[0005] The embodiments of the present disclosure provide a DTX counting method and terminal based on HARQ feedback.

[0006] According to a first aspect of an embodiment of the present disclosure, a method for counting DTX based on HARQ feedback is proposed, which is performed by a first terminal. The method includes:

[0007] Selecting or reselecting a fifth carrier associated with the first unicast connection according to at least one of the 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;

[0008] Performing DTX counting based on HARQ feedback on the fifth carrier;

[0009] Among them, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that triggers carrier selection or reselection, the target address or the SL LCH that triggers 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.

[0010] According to a second aspect of an embodiment of the present disclosure, a first terminal is provided, including:

[0011] a processing module, configured to select or reselect a fifth carrier associated with the first unicast connection based on at least one of the 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 perform a DTX count based on HARQ feedback on the fifth carrier;

[0012] Among them, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that triggers carrier selection or reselection, the target address or the SL LCH that triggers 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.

[0013] According to a third aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0014] one or more processors;

[0015] Among them, the first terminal is used to execute the DTX counting method based on HARQ feedback described in the embodiment of the first aspect.

[0016] According to a fourth aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a first terminal, wherein the first terminal is configured to implement the DTX counting method based on HARQ feedback described in the embodiment of the first aspect.

[0017] According to the fifth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes the DTX counting method based on HARQ feedback as described in the first aspect.

[0018] In the embodiment of the present disclosure, the first terminal can select or reselect the carrier associated with the first unicast connection based on one or more of the target address or the carrier corresponding to the SL LCH that triggered the 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, and perform DTX counting based on HARQ feedback on the carrier associated with the first unicast connection. Thus, in the SL carrier aggregation scenario, the transmitting terminal can perform DTX counting based on HARQ feedback on the carrier selected or reselected based on one or more of the carrier supported by the SL LCH that triggered the 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, which not only saves resources, but also reduces the data packet loss rate and improves the communication quality by sending side link data to the receiving terminal through the selected or reselected carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure;

[0021] FIG2 is an interactive schematic diagram illustrating a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure;

[0022] 3A-3D are schematic flow charts illustrating a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure;

[0023] FIG4 is a schematic flow chart of a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure;

[0024] FIG5 is an interactive schematic diagram illustrating a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure;

[0025] FIG6 is a schematic structural diagram of a first terminal proposed in an embodiment of the present disclosure;

[0026] FIG7A is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure;

[0027] FIG7B is a schematic diagram of the structure of the chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The embodiments of the present disclosure provide a DTX counting method and terminal based on HARQ feedback.

[0029] In a first aspect, an embodiment of the present disclosure provides a method for counting DTX based on HARQ feedback, performed by a first terminal, the method including:

[0030] Selecting or reselecting a fifth carrier associated with the first unicast connection according to at least one of the 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;

[0031] Performing DTX counting based on HARQ feedback on the fifth carrier;

[0032] Among them, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the sidelink logical channel (SL LCH) that triggers carrier selection or reselection, and the target address or the SL LCH that triggers 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.

[0033] In the above embodiment, the first terminal can select or reselect the carrier associated with the first unicast connection based on one or more of the target address or the carrier corresponding to the SL LCH that triggered the 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, and perform DTX counting based on HARQ feedback on the carrier associated with the first unicast connection. Thus, in the SL carrier aggregation scenario, the transmitting terminal can perform DTX counting based on HARQ feedback on the carrier selected or reselected based on one or more of the carrier supported by the SL LCH that triggered the 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, which not only saves resources, but also reduces the data packet loss rate and improves the communication quality by sending side link data to the receiving terminal through the selected or reselected carrier.

[0034] In combination 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:

[0035] determining a first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier;

[0036] The fifth carrier is selected or reselected according to the first intersection.

[0037] In the above embodiment, 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 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, and use the selected or reselected carrier to send side link data to the second terminal, which can reduce the data packet loss rate and improve the communication quality.

[0038] In conjunction with some embodiments of the first aspect, in some embodiments, selecting or reselecting the fifth carrier according to the first intersection includes:

[0039] Determine, in the first intersection, a carrier whose measured channel busy ratio (CBR) is less than or equal to a first threshold as a first candidate carrier;

[0040] The fifth carrier is selected or reselected from the first candidate carriers.

[0041] In the above embodiment, the carrier whose measured CBR in the first intersection is less than or equal to the first threshold is determined as the first candidate carrier, and then the carrier associated with the first unicast connection is selected or reselected from the first candidate carrier, thereby performing DTX counting based on HARQ feedback on the selected or reselected carrier, which can save resources, and using these carriers to send sidelink data to the second terminal can further reduce the data packet loss rate and improve communication quality.

[0042] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0043] Receive first configuration information sent by the network device, wherein the first configuration information includes the first threshold.

[0044] In the above embodiment, the first terminal can obtain the first threshold configured by the network device, thereby configuring the first threshold according to actual needs, thereby improving the flexibility of configuring the first threshold.

[0045] 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:

[0046] receiving the first configuration information sent by the network device through dedicated signaling, where the first terminal is in a radio resource control (RRC) connected state;

[0047] Receiving the first configuration information sent by the network device through a system information block (SIB), where the first terminal is in an RRC idle state or an RRC sleep state;

[0048] The first configuration information is obtained through pre-configuration, and the first terminal is out of coverage (OOC).

[0049] In the above embodiment, the first terminal is in the RRC connected state and can obtain the first threshold configured by the network through dedicated signaling. The first terminal is in the RRC idle state or the RRC sleep state and can obtain the first threshold configured by the network through SIB. The first terminal is in the OOC and can obtain the first threshold through pre-configuration. Therefore, the first terminal can obtain the first threshold in different ways according to the different states, thereby improving the flexibility of obtaining the first threshold.

[0050] In conjunction with some embodiments of the first aspect, in some embodiments, selecting or reselecting the fifth carrier according to the first intersection includes:

[0051] Determining a carrier in the first intersection as a second candidate carrier;

[0052] The fifth carrier is selected or reselected from the second candidate carriers.

[0053] In the above embodiment, the first terminal can determine the carrier in the first intersection as the second candidate carrier, and select or reselect the carrier associated with the first unicast connection from the second candidate carrier, thereby performing 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 side link data to the second terminal, which can further reduce the data packet loss rate and improve communication quality.

[0054] In combination with some embodiments of the first aspect, in some embodiments, determining a first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier includes:

[0055] An intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier is determined as the first intersection.

[0056] In the above embodiment, the first terminal can select or reselect the carrier associated with the first unicast connection based on the intersection of the target address or the carrier corresponding to the SL LCH that triggered the 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, thereby performing 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 side link data to the second terminal, which can effectively reduce the data packet loss rate and improve communication quality.

[0057] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0058] receiving second configuration information from a high layer of the first terminal, where the second configuration information includes 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, where the QoS flow is associated with a unicast service;

[0059] Determine the first carrier according to the second configuration information.

[0060] In the above embodiment, the carrier mode configured at the high level can be obtained based on the mapping relationship between the QoS flow configured at the high level of the first terminal and the carrier and / or the mapping relationship between the target address and the QoS flow, thereby improving the flexibility of obtaining the carrier configured at the high level.

[0061] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0062] receiving third configuration information from a high layer of the first terminal, where the third configuration information includes a mapping relationship between a first service and the target address and / or a mapping relationship between the first service and a carrier, where the first service is a unicast service;

[0063] Determine the first carrier according to the third configuration information.

[0064] In the above embodiment, the carrier mode configured in the high layer can be obtained according to the mapping relationship between the high layer first service of the first terminal and the target address and / or the mapping relationship between the first service and the carrier, thereby improving the flexibility of obtaining the high-configuration carrier.

[0065] In combination with some embodiments of the first aspect, in some embodiments, the third carrier is a carrier supported by the first terminal for sending and / or supporting receiving, and the fourth carrier is a carrier supported by the second terminal for receiving and / or supporting sending.

[0066] In the above embodiment, the first terminal can select or reselect the carrier associated with the first unicast connection based on the carrier supported for sending and / or supported for receiving by the first terminal, and the carrier supported for sending and / or supported for receiving by the second terminal, thereby performing 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 side link data to the second terminal, which can further reduce the data packet loss rate and improve communication quality.

[0067] In combination with some embodiments of the first aspect, in some embodiments, performing DTX counting based on HARQ feedback on the fifth carrier includes:

[0068] detecting, on each of the fifth carriers, a SL HARQ feedback on a physical sidelink feedback channel (PSFCH) corresponding to a physical sidelink shared channel (PSSCH) associated with the first unicast connection;

[0069] If no SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity, incrementing a DTX count based on HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection by 1;

[0070] The SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity, and a DTX count based on the HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection is reinitialized to 0.

[0071] In the above embodiment, the first terminal may detect SL HARQ feedback of the PSSCH on the PSFCH corresponding to the PSSCH associated with the first unicast connection on each fifth carrier, thereby implementing DTX counting based on HARQ feedback for each fifth carrier associated with the first unicast connection.

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

[0073] The DTX count based on HARQ feedback corresponding to the fifth carrier is greater than or equal to a second threshold, and it is determined that a sidelink radio link failure (SL RLF) based on HARQ feedback occurs in the first unicast connection.

[0074] In the above embodiment, when the DTX count based on HARQ feedback corresponding to the fifth carrier associated with the first unicast connection is greater than or equal to the second threshold, it can be determined that SL RLF based on HARQ feedback occurs in the first unicast connection, thereby improving the accuracy of the judgment.

[0075] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0076] Receive fourth configuration information sent by the network device, where the fourth configuration information includes the second threshold.

[0077] In the above embodiment, the first terminal can obtain the second threshold value configured by the network device, thereby configuring the second threshold value according to actual needs, thereby improving the flexibility of the second threshold value configuration.

[0078] In combination 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:

[0079] receiving the fourth configuration information sent by the network device through dedicated signaling, where the first terminal is in an RRC connected state;

[0080] receiving the fourth configuration information sent by the network device through the SIB, where the first terminal is in an RRC idle state or an RRC dormant state;

[0081] The fourth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

[0082] In the above embodiment, the first terminal is in the RRC connected state and can obtain the second threshold configured by the network through dedicated signaling. The first terminal is in the RRC idle state or the RRC sleep state and can obtain the second threshold configured by the network through SIB. The first terminal is in the OOC and can obtain the second threshold through pre-configuration. Therefore, the first terminal can obtain the second threshold in different ways according to the different states, thereby improving the flexibility of obtaining the first threshold.

[0083] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0084] Indication information sent by the second terminal is received, where the indication information is used to indicate the fourth carrier supported by the second terminal.

[0085] In the above embodiment, the first terminal can receive the indication information sent by the second terminal, thereby obtaining the fourth carrier supported by the second terminal according to the indication information, and then can select or reselect the carrier associated with the first unicast connection according to the fourth carrier supported by the second terminal, thereby performing 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 side link data to the second terminal, which can further reduce the data packet loss rate and improve communication quality.

[0086] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0087] Fifth configuration information sent by the network device is received, where the fifth configuration information includes the second carrier.

[0088] In the above embodiment, the first terminal can obtain the carrier configured by the network device, so that the carrier can be configured for the first terminal according to actual needs, thereby improving the flexibility of the network in configuring the carrier.

[0089] In combination with some embodiments of the first aspect, in some embodiments, receiving fifth configuration information sent by the network device includes any one of the following:

[0090] receiving the fifth configuration information sent by the network device through dedicated signaling, where the first terminal is in an RRC connected state;

[0091] receiving the fifth configuration information sent by the network device through the SIB, where the first terminal is in an RRC idle state or an RRC dormant state;

[0092] The fifth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

[0093] In the above embodiment, the first terminal is in an RRC connected state and can obtain the second carrier configured by the network through dedicated signaling. The first terminal is in an RRC idle state or an RRC sleep state and can obtain the second carrier configured by the network through SIB. The first terminal is in OOC and can obtain the second carrier through pre-configuration. Therefore, the first terminal can obtain the second carrier in different ways according to its different states, thereby improving the flexibility of obtaining the second carrier.

[0094] In the second aspect, an embodiment of the present disclosure proposes 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 method described in the first aspect and the optional implementation method of the first aspect.

[0095] In a third aspect, an embodiment of the present disclosure proposes a terminal, which includes: one or more processors; wherein the first terminal is used to execute the method described in the first aspect and the optional implementation manner of the first aspect.

[0096] In a fourth aspect, an embodiment of the present disclosure proposes a communication system, including a first terminal, wherein the first terminal is configured to implement the method described in the first aspect and the method described in the optional implementation manner of the first aspect.

[0097] In a fifth aspect, an embodiment of the present disclosure proposes a storage medium, which stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the first aspect and the optional implementation of the first aspect.

[0098] In a sixth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the first aspect and the optional implementation manner of the first aspect.

[0099] In an eighth aspect, an embodiment of the present disclosure provides a chip or a chip system, which includes a processing circuit configured to execute the above-mentioned first aspect and the optional implementation of the first aspect.

[0100] It is understandable that the above-mentioned terminals, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to perform the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0101] The present disclosure provides a method and terminal for counting DTX based on HARQ feedback. In some embodiments, the terms "method for counting DTX based on HARQ feedback" and "information processing method" and "communication method" are interchangeable; the terms "information transmission device" and "information processing device" and "communication device" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0102] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a 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 exchanged. In addition, the optional implementations in a particular embodiment can be arbitrarily combined. In addition, 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 implementations of other embodiments.

[0103] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0104] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0105] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0106] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0107] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0108] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0109] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0110] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0111] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0112] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0113] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0114] 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", "bandwidth part (BWP)" and the like may be used interchangeably.

[0115] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0116] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, it can also be called device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the terminal has all or part of the functions of the access network device. In addition, language such as "uplink" and "downlink" can also be replaced by language corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0117] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0118] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0119] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0120] Figure 1 is a schematic diagram illustrating the architecture of a communication system according to an embodiment of the present disclosure. As shown in Figure 1, communication system 100 may include a first terminal 101 and a second terminal 102. A communication connection may be established between first terminal 101 and second terminal 102. SL communication may be performed between first terminal 101 and second terminal 102.

[0121] 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.

[0122] In some embodiments, the first terminal 101 or the second terminal 102 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0123] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB) in a 5G communication system, a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a WiFi system, but is not limited thereto.

[0124] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0125] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0126] In some embodiments, a core network device may be a single device comprising one or more network elements, or may be a plurality of devices or a group of devices, each comprising all or part of one or more network elements. A network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0127] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0128] The following embodiments of the present disclosure may be applied to the communication system 100 shown in Figure 1, or a portion thereof, but are not limited thereto. The entities shown in Figure 1 are illustrative only. The communication system may include all or part of the entities shown in Figure 1, or may include other entities outside of Figure 1. The number and form of the entities may be arbitrary. The connection relationship between the entities is illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0129] The embodiments of the present disclosure 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), future generation radio access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0130] In order to support direct communication between terminals, the SL communication mode is introduced. Optionally, the interface between the terminals can be PC-5 (direct communication interface).

[0131] In some embodiments, the terms "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" and the like may be used interchangeably.

[0132] Optionally, according to the corresponding relationship between the sending terminal and the receiving terminal, three transmission modes are supported on the SL: unicast, multicast and broadcast.

[0133] Optionally, there are two ways to allocate transmission resources for SL communication: one is the network scheduling transmission resources, and the other is the terminal autonomously selecting transmission resources from a network-configured or pre-configured resource pool. The network scheduling transmission resource method is that the network device dynamically allocates transmission resources on the SL to the terminal based on the terminal's cached data report, while the autonomous selection of transmission resources method is that the terminal randomly selects transmission resources from a network-configured or pre-configured resource pool. Optionally, the network device can configure multiple resource pools for the terminal on a BWP. Optionally, the specific resource allocation method used by the terminal can be configured by the network device through RRC signaling.

[0134] 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 (mode 1).

[0135] In some embodiments, the name of the method for autonomously selecting sending resources is not limited. For example, the method for autonomously selecting sending resources may be mode 2.

[0136] In some embodiments, both downlink and uplink channel access in unlicensed spectrum rely on a listen-before-talk (LBT) feature. A wireless device or base station must first "sense" the communication channel to detect the absence of communication before any transmission. When a communication channel is an unlicensed wideband carrier (e.g., several hundred megahertz), the LBT process relies on detecting energy levels across multiple sub-bands of the communication channel. Exemplarily, LBT parameters (e.g., type / duration, clear channel assessment parameters, etc.) can be configured on the wireless device by the base station.

[0137] In some embodiments, based on the SL RLF detection mechanism of HARQ feedback, for a unicast connection, if the terminal does not receive HARQ feedback (DTX) on the PSFCH resource for a certain number of consecutive times, the terminal may consider that the unicast connection has SL RLF based on HARQ feedback and notify the RRC layer. RRC controls the SL RLF detection based on HARQ feedback by configuring the maximum consecutive DTX number sl-maxNumConsecutiveDTX for each terminal (per UE). At the same time, the terminal maintains a numConsecutiveDTX variable for each unicast connection, which is used to count the number of consecutive DTXs for this unicast connection. When the unicast connection is established or sl-maxNumConsecutiveDTX is reconfigured or initially configured, the terminal initializes the variable numConsecutiveDTX corresponding to the unicast connection to 0. The terminal counts whether there is DTX for each PSFCH reception opportunity associated with each PSSCH transmission of this unicast connection. If no HARQ feedback is received on the PSFCH opportunity, the terminal adds 1 to the variable numConsecutiveDTX corresponding to the unicast connection. When the numConsecutiveDTX variable corresponding to the unicast connection reaches the maximum value sl-maxNumConsecutiveDTX, the terminal considers that a SL RLF based on HARQ feedback has occurred in the unicast connection and notifies the RRC layer. If the terminal receives HARQ feedback on the PSFCH opportunity, the terminal initializes the variable numConsecutiveDTX corresponding to the unicast connection to 0.

[0138] In some embodiments, in a carrier aggregation scenario, DTX based on HARQ feedback can be counted at a carrier granularity, and the terminal does not trigger SL RLF even if the DTX count based on HARQ feedback of one or more carriers reaches a maximum value, but the terminal device has other carriers available.

[0139] In some embodiments, in the SL carrier aggregation scenario, the detailed method for performing HARQ-based DTX counting on specific carriers has not yet been clarified.

[0140] Based on this, the present disclosure proposes a DTX counting method based on HARQ feedback.

[0141] Optionally, in some embodiments, the method of the present disclosure may be applied to a SL carrier aggregation scenario. For example, in some embodiments, the method of the present disclosure may be applied to a vehicle networking scenario.

[0142] FIG2 is an interactive diagram illustrating a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG2 , an embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used in a communication system 100. The method includes:

[0143] Step S2101: The first terminal 101 selects or reselects a fifth carrier associated with the first unicast connection.

[0144] In some embodiments, "carrier," "frequency band," "spectrum," and "frequency" may be used interchangeably.

[0145] In some embodiments, the first unicast connection may be a unicast connection between the first terminal 101 and the second terminal 102 .

[0146] In some embodiments, the first terminal 101 is a transmitting terminal and the second terminal 102 is a receiving terminal.

[0147] In some embodiments, the first carrier is a carrier corresponding to the target address, or a carrier corresponding to the SL LCH that triggered carrier selection or reselection. Exemplarily, the target address may be a destination layer 2 address (Destination L2ID). 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 target address is associated with the second terminal 102 of the first unicast connection.

[0148] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the target address, and the access stratum (AS layer) of the first terminal 101 can receive the second configuration information sent by the upper layer of the first terminal 101, wherein the second configuration information may include the mapping relationship between the QoS flow and the carrier and / or the mapping relationship between the target address and the QoS flow. According to the second configuration information, the carrier corresponding to the target address can be determined. Exemplarily, the carrier corresponding to the target address can be determined based on the mapping relationship between the QoS flow and the carrier and the mapping relationship between the target address and the QoS flow. Exemplarily, the carrier corresponding to the target address can be determined based on the mapping relationship between the QoS flow and the carrier and the QoS flow associated with the target address. Exemplarily, the AS layer can use 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. Exemplarily, the QoS flow can be associated with a unicast service. Exemplarily, the upper layer can be a V2X layer.

[0149] For example, the target address associated with the first service a1 is b1. The three QoS flows for the target address b1 from the high layer are flow1, flow2, and flow3. The high layer provides the following mapping relationship between QoS flows and carriers: (flow1, f1, f2, f3), (flow2, f1, f2, f3, f4), (flow3, f2, f3, f4). The AS layer can obtain the mapping of the target address b1 to the carrier as (b1, f1, f2, f3, f4), that is, the carriers corresponding to the target address b1 are f1, f2, f3, and f4.

[0150] In some embodiments, the first terminal 101 may obtain the carrier corresponding to the target address, and the AS layer of the first terminal 101 may receive third configuration information sent by a higher layer of the first terminal 101, wherein 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 may be determined. Exemplarily, the higher layer may be a 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 the one or more first services associated with the target address as the carrier corresponding to the target address.

[0151] For example, 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.

[0152] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the SL LCH that triggered the carrier selection or reselection. Exemplarily, the SL LCH that triggered the carrier selection or reselection is associated with a target address. Exemplarily, the SL LCH that triggered the carrier selection or reselection has SL data to be transmitted to the target address. Exemplarily, the target address is associated with the first unicast connection, and the target address is associated with the second terminal 102 of the first unicast connection.

[0153] In some embodiments, the first carrier is the carrier corresponding to the sidelink logical channel that triggers carrier selection or reselection. The AS layer of the first terminal 101 can receive the second configuration information sent by the high layer of the first terminal 101, wherein the second configuration information may include a mapping relationship between the QoS flow and the carrier. The first terminal 101 determines the mapping relationship between the QoS flow and the SL LCH according to the sidelink radio bearer (SL RB) configuration. Combined with the mapping relationship between the QoS flow and the carrier in the second configuration information, the mapping relationship between the SL LCH and the carrier can be determined, and then the carrier corresponding to the SL LCH that triggered the carrier selection or reselection is determined.

[0154] In some embodiments, the first carrier is the carrier corresponding to the sidelink logical channel that triggers carrier selection or reselection. The AS layer of the first terminal 101 can receive the third configuration information sent by the high 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 based on the configuration of the sidelink wireless bearer. Combined with 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 then the carrier corresponding to the SL LCH that triggered the carrier selection or reselection can be determined.

[0155] 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 the 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, namely 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 the selection or reselection are f1 and f2, then the carrier corresponding to the target address is different from the carrier that triggered the carrier selection or reselection. If L1 and L2 trigger carrier selection or reselection, and the carriers corresponding to the SL LCH that triggered the 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 the carrier selection or reselection.

[0156] In some embodiments, the first terminal 101 may receive fifth configuration information sent by the network device, where the fifth configuration information may include a second carrier.

[0157] Exemplarily, if the first terminal 101 is in an RRC connected state, the first terminal 101 can receive the fifth configuration information sent by the network device through dedicated signaling. Exemplarily, if the first terminal 101 is in an RRC idle state or an RRC sleep state, the first terminal 101 can receive the fifth configuration information sent by the network device through the SIB. If the first terminal 101 is in OOC, the first terminal 101 can obtain the fifth configuration information through pre-configuration. That is, if the first terminal 101 is in an RRC connected state, the second carrier configured by the network device can be obtained through dedicated signaling. If the first terminal 101 is in an RRC idle state or an RRC sleep state, the second carrier configured by the network device can be obtained through the SIB. If the first terminal is in OOC, the second carrier can be obtained through pre-configuration.

[0158] In some embodiments, the first terminal 101 may receive indication information sent by the second terminal 102, where 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 a carrier supported by the second terminal 102 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 a carrier supported by the receiving terminal for receiving and / or transmitting.

[0159] In some embodiments, the first terminal 101 determines to trigger carrier selection or reselection, and the first terminal 101 determines the SL LCH that triggers the 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 first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal 101, and the fourth carrier supported by the second terminal 102. Exemplarily, the first carrier may be the carrier corresponding to the target address or the 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 a carrier supported by the first terminal 101 for sending and / or supporting reception.

[0160] In some embodiments, if the carrier corresponding to the target address is the same as the carrier corresponding to the SL LCH that triggered the 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 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 the carrier selection or reselection, the second carrier, the third carrier and the fourth carrier; if the carrier corresponding to the target address is not the same as the carrier corresponding to the SL LCH that triggered the carrier selection or reselection, the first terminal 101 selects or reselects the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the SL LCH that triggered the carrier selection or reselection, the second carrier, the third carrier and the fourth carrier.

[0161] In some embodiments, the first terminal 101 may select or reselect a fifth carrier associated with the first unicast connection based on an 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. Exemplarily, the first carrier may be a carrier corresponding to the target address or a carrier corresponding to the SL LCH that triggered carrier selection or reselection.

[0162] 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 a candidate carrier based on the first intersection, and then select or reselect the fifth carrier from the candidate carriers.

[0163] In some embodiments, the first terminal 101 may determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as the first intersection.

[0164] In some embodiments, the first terminal 101 may determine a carrier in the first intersection as a first candidate carrier, and then select or reselect a fifth carrier from the first candidate carrier. Exemplarily, the number of fifth carriers selected or reselected by the first terminal 101 from the first candidate carriers may be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected may be determined based on the capabilities of the first terminal 101.

[0165] In some embodiments, the first terminal 101 may determine a carrier in the first intersection whose measured CBR is less than or equal to the first threshold as a second candidate carrier, 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 may be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected may be determined based on the capabilities of the first terminal 101.

[0166] In some embodiments, the first terminal 101 may determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as a first intersection, determine the carrier in the first intersection whose measured CBR is less than or equal to the first threshold as a second candidate carrier, and then select or reselect the fifth carrier from the second candidate carrier.

[0167] In some embodiments, the first terminal 101 may determine the intersection of the first carrier, the second carrier, and the third carrier that the first terminal 101 supports sending, and the fourth carrier that the second terminal 102 supports receiving as a first intersection, and determine the carrier whose measured CBR in the first intersection is less than or equal to the first threshold as the second candidate carrier, and then select or reselect the fifth carrier from the second candidate carrier. It can be seen that the fifth carrier is the carrier corresponding to the target address or the SLCCH that triggers carrier selection or reselection, the carrier configured by the network device, the carrier supported by the first terminal 101 and the second terminal, and 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 through the fifth carrier can reduce the data packet loss rate and improve the communication quality.

[0168] 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. Then the first intersection is {f3, f4}, and the measured CBRs of carrier f3 and carrier f4 in the first intersection are both less than the first threshold. Carrier f3 and carrier f4 can be determined as candidate carriers, and then the fifth carrier is selected or reselected from carrier f3 and carrier f4. For example, carrier f3 and carrier f4 can be selected or reselected, that is, the fifth carrier is carrier f3 and carrier f4.

[0169] In some embodiments, the first terminal 101 may determine the intersection of the carriers in the first carrier whose measured CBR is less than or equal to the first threshold, the carriers in the second carrier whose measured CBR is less than or equal to the first threshold, the carriers in the third carrier whose measured CBR is less than or equal to the first threshold, and the carriers in the fourth carrier whose measured CBR is less than or equal to the first threshold as a first intersection, determine the carriers in the first intersection as the first candidate carrier, and then select or reselect the fifth carrier from the first candidate carrier.

[0170] In some embodiments, the first terminal 101 may determine a carrier in the intersection of the first carrier and the second carrier that satisfies both the measured CBR less than or equal to the first threshold, supported by the first terminal 101 and supported by the second terminal 102 as a third candidate carrier, and then select or reselect a fifth carrier from the third candidate carrier.

[0171] 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 carrier and the second carrier is {f2, f3, f4}. The carriers in the intersection that satisfy the measured CBR less than or equal to the first threshold are f3 and f4. Carrier f3 and carrier f4 are carriers supported by the first terminal 101 and also supported by the second terminal 102. Therefore, carrier f3 and carrier f4 are determined to be the third candidate carriers, and then the fifth carrier is selected or reselected from carrier f3 and carrier f4. For example, carrier f3 and carrier f4 can be selected or reselected, that is, the fifth carrier is carrier f3 and carrier f4.

[0172] 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.

[0173] Exemplarily, if the first terminal 101 is in an RRC connected state, the first terminal 101 can receive the first configuration information sent by the network device through dedicated signaling. Exemplarily, if the first terminal 101 is in an RRC idle state or an RRC sleep state, the first terminal 101 can receive the first configuration information sent by the network device through the SIB. If the first terminal 101 is in OOC, the first terminal 101 can obtain the first configuration information through pre-configuration. That is, if the first terminal 101 is in an RRC connected state, the first threshold configured by the network device can be obtained through dedicated signaling. If the first terminal 101 is in an RRC idle state or an RRC sleep state, the first threshold configured by the network device can be obtained through the SIB. If the first terminal is in OOC, the first threshold can be obtained through pre-configuration.

[0174] 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 can be the carrier selection or reselection CBR threshold corresponding to the priority of the SL LCH that triggers carrier selection or reselection.

[0175] In some embodiments, terms such as "first", "certain", "preset", "preset", "setting", "indicated", "a certain", "arbitrary", and "any" can be interchangeable. "First", "certain A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "any A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, any A, or any A, or first A, etc., but not limited to this.

[0176] Step S2102 : The first terminal 101 sends sidelink data to the second terminal 102 .

[0177] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 via the selected or reselected fifth carrier associated with the first unicast connection.

[0178] In some embodiments, the second terminal 102 may receive sidelink data sent by the first terminal 101 .

[0179] In some embodiments, the second terminal 102 may receive the sidelink data sent by the first terminal 101 through the fifth carrier associated with the first unicast connection.

[0180] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0181] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0182] In step S2103 , the first terminal 101 counts DTX based on HARQ feedback for the fifth carrier associated with the first unicast connection.

[0183] In some embodiments, the first terminal 101 performs a DTX count based on HARQ feedback for the fifth carrier associated with the first unicast connection that is selected or reselected.

[0184] In some embodiments, there are multiple fifth carriers associated with the first unicast connection, and DTX counts based on HARQ feedback may be performed for each fifth carrier. For example, if the fifth carriers associated with the first unicast connection are carrier f3 and carrier f4, DTX counts based on HARQ feedback may be performed for carrier f3 and carrier f4, respectively, to obtain DTX counts based on HARQ feedback corresponding to carrier f3 and carrier f4.

[0185] In some embodiments, there are multiple fifth carriers associated with the first unicast connection. The first terminal 101 can detect the 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 the SL HARQ feedback of the PSSCH is not detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on the fifth carrier, the DTX count based on the HARQ feedback corresponding to the fifth carrier associated with the first unicast connection is increased by 1. If the SL HARQ feedback of the PSSCH is detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on the fifth carrier, the DTX count based on the HARQ feedback corresponding to the fifth carrier associated with the first unicast connection is reinitialized to 0. If the DTX counts based on the HARQ feedback corresponding to the fifth carrier associated with the first unicast connection all reach the maximum value, SL RLF is triggered.

[0186] For example, the fifth carrier associated with the first unicast connection is carrier f3 and carrier f4. The SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f3. If the SL HARQ feedback of the PSSCH is not detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f3, the DTX count based on the HARQ feedback corresponding to carrier f3 is increased by 1. If the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f3, the DTX count based on the HARQ feedback corresponding to carrier f3 is reinitialized to 0; the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f4. If the SL HARQ feedback of the PSSCH is not detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f4, For HARQ feedback, the DTX count based on HARQ feedback corresponding to carrier f4 is increased by 1. If SL HARQ feedback of PSSCH is detected during the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f4, the DTX count based on HARQ feedback corresponding to carrier f4 is reinitialized to 0. When the DTX count based on HARQ feedback for both carriers f3 and f4 reaches the maximum value, SL RLF is triggered.

[0187] In some embodiments, if the HARQ feedback-based DTX count corresponding to the fifth carrier associated with the first unicast connection is greater than a second threshold, it can be determined that a HARQ feedback-based SL RLF has occurred in the first unicast connection. Exemplarily, "greater than the second threshold" and "reaching the maximum value" in the above example can be interchangeable.

[0188] In some embodiments, the first terminal 101 may receive fourth configuration information sent by the network device, where the fourth configuration information may include a second threshold.

[0189] Exemplarily, if the first terminal 101 is in an RRC connected state, the first terminal 101 may receive the fourth configuration information sent by the network device through dedicated signaling. Exemplarily, if the first terminal 101 is in an RRC idle state or an RRC sleep state, the first terminal 101 may receive the fourth configuration information sent by the network device through the SIB. If the first terminal 101 is in OOC, the first terminal 101 may obtain the fourth configuration information through pre-configuration. That is, if the first terminal 101 is in an RRC connected state, the second threshold configured by the network device may be obtained through dedicated signaling. If the first terminal 101 is in an RRC idle state or an RRC sleep state, the second threshold configured by the network device may be obtained through the SIB. If the first terminal is in OOC, the second threshold may be obtained through pre-configuration.

[0190] The DTX counting method based on HARQ feedback involved in the embodiments of the present disclosure 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.

[0191] In some embodiments, step S2102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0192] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0193] FIG3A is a flow chart of a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3A , the embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used for a first terminal 101. The method includes:

[0194] Step S3101: Select or reselect a fifth carrier associated with the first unicast connection.

[0195] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0196] Step S3102: Send sidelink data.

[0197] 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.

[0198] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0199] Step S3103: Count the DTX based on HARQ feedback for the fifth carrier associated with the first unicast connection.

[0200] The optional implementation of step S3103 can refer to the optional implementation of step S2102 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0201] In some embodiments, step S3102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0202] The DTX counting method based on HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3101 and 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, step S3101 and step S3102 may be implemented as independent embodiments, and step S3102 and step S3103 may be implemented as independent embodiments, but are not limited thereto.

[0203] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, and the optional methods or optional examples can be arbitrarily combined.

[0204] FIG3B is a flow chart of a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used for a first terminal 101. The method includes:

[0205] Step S3201: Determine an intersection 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 as a first intersection.

[0206] Optional implementations of step S3201 can be found in step S2101 of FIG. 2 , optional implementations of step S3101 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0207] Step S3202: Select or reselect a fifth carrier according to the measured CBRs of the carriers in the first intersection.

[0208] The optional implementation of step S3202 can refer to step S2101 in Figure 2, the optional implementation of step S3101 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0209] Step S3203: Perform DTX counting based on HARQ feedback on the fifth carrier.

[0210] Optional implementations of step S3203 may refer to step S2103 in FIG. 2 , optional implementations of step S3103 in FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0211] The DTX counting method based on HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3203. For example, step S3201 may be implemented as an independent embodiment, step S3202 may be implemented as an independent embodiment, step S3203 may be implemented as an independent embodiment, and step S3201, step S3202, and step S3203 may be implemented as independent embodiments, but are not limited thereto.

[0212] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, and the optional methods or optional examples can be arbitrarily combined.

[0213] FIG3C is a flow chart of a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3C , the embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used for a first terminal 101. The method includes:

[0214] Step S3301: Determine a first intersection of 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.

[0215] The optional implementation of step S3301 can refer to the optional implementation of step S2101 in Figure 2, step S3101 in Figure 3A, step S3201 in Figure 3B, and other related parts in the embodiments involved in Figures 2, 3A, and 3B, which will not be repeated here.

[0216] Step S3302: Select or reselect a fifth carrier according to the first intersection.

[0217] The optional implementation of step S3302 can refer to step S2101 in Figure 2, the optional implementation of step S3101 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0218] Step S3303: Perform DTX counting based on HARQ feedback on the fifth carrier.

[0219] The optional implementation of step S3303 can be found in step S2103 of FIG. 2 , the optional implementation of step S3103 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 , FIG. 3A , and FIG. 3B , which will not be described in detail here.

[0220] The DTX counting method based on HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3301 to S3303. For example, step S3301 may be implemented as an independent embodiment, step S3302 may be implemented as an independent embodiment, step S3303 may be implemented as an independent embodiment, step S3303 may be implemented as an independent embodiment, step S3301 and step S3302 may be implemented as independent embodiments, and step S3301, step S3302, and step S3303 may be implemented as independent embodiments, but are not limited thereto.

[0221] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, and the optional methods or optional examples can be arbitrarily combined.

[0222] FIG3D is a flow chart of a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG3D , the embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used for a first terminal 101. The method includes:

[0223] Step S3401: Select or reselect 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.

[0224] In some embodiments, "carrier," "frequency band," "spectrum," and "frequency" may be used interchangeably.

[0225] In some embodiments, the first unicast connection may be a unicast connection between the first terminal 101 and the second terminal 102 .

[0226] In some embodiments, the first terminal 101 is a transmitting terminal and the second terminal 102 is a receiving terminal.

[0227] In some embodiments, the first carrier is a carrier corresponding to the target address, or a carrier corresponding to the SL LCH that triggered carrier selection or reselection. Exemplarily, the target address may be a destination layer 2 address (Destination L2ID). 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 target address is associated with the second terminal 102 of the first unicast connection.

[0228] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the target address, and the access stratum (AS layer) of the first terminal 101 can receive the second configuration information sent by the upper layer of the first terminal 101, wherein the second configuration information may include the mapping relationship between the QoS flow and the carrier and / or the mapping relationship between the target address and the QoS flow. According to the second configuration information, the carrier corresponding to the target address can be determined. Exemplarily, the carrier corresponding to the target address can be determined based on the mapping relationship between the QoS flow and the carrier and the mapping relationship between the target address and the QoS flow. Exemplarily, the carrier corresponding to the target address can be determined based on the mapping relationship between the QoS flow and the carrier and the QoS flow associated with the target address. Exemplarily, the AS layer can use 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. Exemplarily, the QoS flow can be associated with a unicast service. Exemplarily, the upper layer can be a V2X layer.

[0229] For example, the target address associated with the first service a1 is b1. The three QoS flows for the target address b1 from the upper layer are flow1, flow2, and flow3. The mapping relationship between the QoS flow and the carrier provided by the upper layer is as follows: (flow1, f1, f2, f3), (flow2, f1, f2, f3, f4), (flow3, f2, f3, f4). The AS layer can obtain the mapping of the target address b1 to the carrier as (b1, f1, f2, f3, f4), that is, the carriers corresponding to the target address b1 are f1, f2, f3, and f4.

[0230] In some embodiments, the AS layer of the first terminal 101 may receive third configuration information sent by a higher layer of the first terminal 101, where 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 may be determined. Exemplarily, the higher layer may be a V2X layer. Exemplarily, the first service may be a unicast service. Exemplarily, there may be one or more first services, and the AS layer may use the union of the carriers corresponding to the one or more first services associated with the target address as the carrier corresponding to the target address.

[0231] For example, 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.

[0232] In some embodiments, the first terminal 101 can obtain the carrier corresponding to the SL LCH that triggered the carrier selection or reselection. Exemplarily, the SL LCH that triggered the carrier selection or reselection is associated with a target address. Exemplarily, the SL LCH that triggered the carrier selection or reselection has SL data to be transmitted to the target address. Exemplarily, the target address is associated with the first unicast connection, and the target address is associated with the second terminal 102 of the first unicast connection.

[0233] In some embodiments, the first carrier is the carrier corresponding to the side link logical channel that triggers carrier selection or reselection. The AS layer of the first terminal 101 can receive the second configuration information sent by the high layer of the first terminal 101, wherein the second configuration information may include the mapping relationship between the QoS flow and the carrier. The first terminal 101 determines the mapping relationship between the QoS flow and the SL LCH according to the SL RB configuration. Combined with the mapping relationship between the QoS flow and the carrier in the second configuration information, the mapping relationship between the SL LCH and the carrier can be determined, and then the carrier corresponding to the SL LCH that triggered the carrier selection or reselection is determined.

[0234] In some embodiments, the first carrier is the carrier corresponding to the side link logical channel that triggers carrier selection or reselection. The AS layer of the first terminal 101 can receive the third configuration information sent by the high 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 based on the configuration of the SL RB. Combined with 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 then the carrier corresponding to the SL LCH that triggered the carrier selection or reselection can be determined.

[0235] 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 the 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, namely 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 the selection or reselection are f1 and f2, then the carrier corresponding to the target address is different from the carrier that triggered the carrier selection or reselection. If L1 and L2 trigger carrier selection or reselection, and the carriers corresponding to the SL LCH that triggered the 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 the carrier selection or reselection.

[0236] In some embodiments, the first terminal 101 may receive fifth configuration information sent by the network device, where the fifth configuration information may include a second carrier.

[0237] Exemplarily, if the first terminal 101 is in an RRC connected state, the first terminal 101 can receive the fifth configuration information sent by the network device through dedicated signaling. Exemplarily, if the first terminal 101 is in an RRC idle state or an RRC sleep state, the first terminal 101 can receive the fifth configuration information sent by the network device through the SIB. If the first terminal 101 is in OOC, the first terminal 101 can obtain the fifth configuration information through pre-configuration. That is, if the first terminal 101 is in an RRC connected state, the second carrier configured by the network device can be obtained through dedicated signaling. If the first terminal 101 is in an RRC idle state or an RRC sleep state, the second carrier configured by the network device can be obtained through the SIB. If the first terminal is in OOC, the second carrier can be obtained through pre-configuration.

[0238] In some embodiments, the first terminal 101 may receive indication information sent by the second terminal 102, where 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 a carrier supported by the second terminal 102 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 a carrier supported by the receiving terminal for receiving and / or transmitting.

[0239] In some embodiments, the first terminal 101 determines to trigger carrier selection or reselection, and the first terminal 101 determines the SL LCH that triggers the 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 first carrier, the second carrier configured by the network device, the third carrier supported by the first terminal 101, and the fourth carrier supported by the second terminal 102. Exemplarily, the first carrier may be the carrier corresponding to the target address or the 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 a carrier supported by the first terminal 101 for sending and / or supporting reception.

[0240] In some embodiments, if the carrier corresponding to the target address is the same as the carrier corresponding to the SL LCH that triggered the 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 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 the carrier selection or reselection, the second carrier, the third carrier and the fourth carrier; if the carrier corresponding to the target address is not the same as the carrier corresponding to the SL LCH that triggered the carrier selection or reselection, the first terminal 101 selects or reselects the fifth carrier associated with the first unicast connection based on at least one of the carrier corresponding to the SL LCH that triggered the carrier selection or reselection, the second carrier, the third carrier and the fourth carrier.

[0241] In some embodiments, the first terminal 101 may select or reselect a fifth carrier associated with the first unicast connection based on an 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. Exemplarily, the first carrier may be a carrier corresponding to the target address or a carrier corresponding to the SL LCH that triggered carrier selection or reselection.

[0242] 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 a candidate carrier based on the first intersection, and then select or reselect the fifth carrier from the candidate carriers.

[0243] In some embodiments, the first terminal 101 may determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as the first intersection.

[0244] In some embodiments, the first terminal 101 may determine a carrier in the first intersection as a first candidate carrier, and then select or reselect a fifth carrier from the first candidate carrier. Exemplarily, the number of fifth carriers selected or reselected by the first terminal 101 from the first candidate carriers may be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected may be determined based on the capabilities of the first terminal 101.

[0245] In some embodiments, the first terminal 101 may determine a carrier in the first intersection whose measured CBR is less than or equal to the first threshold as a second candidate carrier, 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 may be implemented by the first terminal 101, for example, the number of fifth carriers selected or reselected may be determined based on the capabilities of the first terminal 101.

[0246] In some embodiments, the first terminal 101 may determine the intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier as a first intersection, determine the carrier in the first intersection whose measured CBR is less than or equal to the first threshold as a second candidate carrier, and then select or reselect the fifth carrier from the second candidate carrier.

[0247] In some embodiments, the first terminal 101 may determine the intersection of the first carrier, the second carrier, and the third carrier that the first terminal 101 supports sending, and the fourth carrier that the second terminal 102 supports receiving as a first intersection, and determine the carrier whose measured CBR in the first intersection is less than or equal to the first threshold as the second candidate carrier, and then select or reselect the fifth carrier from the second candidate carrier. It can be seen that the fifth carrier is the carrier corresponding to the target address or the SLCCH that triggers carrier selection or reselection, the carrier configured by the network device, the carrier supported by the first terminal 101 and the second terminal, and 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 through the fifth carrier can reduce the data packet loss rate and improve the communication quality.

[0248] 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. Then the first intersection is {f3, f4}, and the measured CBRs of carrier f3 and carrier f4 in the first intersection are both less than the first threshold. Carrier f3 and carrier f4 can be determined as candidate carriers, and then the fifth carrier is selected or reselected from carrier f3 and carrier f4. For example, carrier f3 and carrier f4 can be selected or reselected, that is, the fifth carrier is carrier f3 and carrier f4.

[0249] In some embodiments, the first terminal 101 may determine the intersection of the carriers in the first carrier whose measured CBR is less than or equal to the first threshold, the carriers in the second carrier whose measured CBR is less than or equal to the first threshold, the carriers in the third carrier whose measured CBR is less than or equal to the first threshold, and the carriers in the fourth carrier whose measured CBR is less than or equal to the first threshold as a first intersection, determine the carriers in the first intersection as the first candidate carrier, and then select or reselect the fifth carrier from the first candidate carrier.

[0250] In some embodiments, the first terminal 101 may determine a carrier in the intersection of the first carrier and the second carrier that satisfies both the measured CBR less than or equal to the first threshold, supported by the first terminal 101 and supported by the second terminal 102 as a third candidate carrier, and then select or reselect a fifth carrier from the third candidate carrier.

[0251] 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 carrier and the second carrier is {f2, f3, f4}. The carriers in the intersection that satisfy the measured CBR less than or equal to the first threshold are f3 and f4. Carrier f3 and carrier f4 are carriers supported by the first terminal 101 and also supported by the second terminal 102. Therefore, carrier f3 and carrier f4 are determined to be the third candidate carriers, and then the fifth carrier is selected or reselected from carrier f3 and carrier f4. For example, carrier f3 and carrier f4 can be selected or reselected, that is, the fifth carrier is carrier f3 and carrier f4.

[0252] 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.

[0253] Exemplarily, if the first terminal 101 is in an RRC connected state, the first terminal 101 can receive the first configuration information sent by the network device through dedicated signaling. Exemplarily, if the first terminal 101 is in an RRC idle state or an RRC sleep state, the first terminal 101 can receive the first configuration information sent by the network device through the SIB. If the first terminal 101 is in OOC, the first terminal 101 can obtain the first configuration information through pre-configuration. That is, if the first terminal 101 is in an RRC connected state, the first threshold configured by the network device can be obtained through dedicated signaling. If the first terminal 101 is in an RRC idle state or an RRC sleep state, the first threshold configured by the network device can be obtained through the SIB. If the first terminal is in OOC, the first threshold can be obtained through pre-configuration.

[0254] In some embodiments, the first terminal 101 may 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 triggers the carrier selection or reselection.

[0255] In some embodiments, terms such as "first", "certain", "preset", "preset", "setting", "indicated", "a certain", "arbitrary", and "any" can be interchangeable. "First", "certain A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "any A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, any A, or any A, or first A, etc., but not limited to this.

[0256] Step S3402: Perform DTX counting based on HARQ feedback on the fifth carrier.

[0257] In some embodiments, the first terminal 101 may send sidelink data to the second terminal 102 via the selected or reselected fifth carrier associated with the first unicast connection.

[0258] In some embodiments, the second terminal 102 may receive sidelink data sent by the first terminal 101 .

[0259] In some embodiments, the second terminal 102 may receive the sidelink data sent by the first terminal 101 through the fifth carrier associated with the first unicast connection.

[0260] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0261] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0262] In some embodiments, the first terminal 101 may perform a DTX count based on HARQ feedback for the selected or reselected fifth carrier associated with the first unicast connection.

[0263] In some embodiments, there are multiple fifth carriers associated with the first unicast connection, and DTX counts based on HARQ feedback may be performed for each fifth carrier. For example, if the fifth carriers associated with the first unicast connection are carrier f3 and carrier f4, DTX counts based on HARQ feedback may be performed for carrier f3 and carrier f4, respectively, to obtain DTX counts based on HARQ feedback corresponding to carrier f3 and carrier f4.

[0264] In some embodiments, there are multiple fifth carriers associated with the first unicast connection. The first terminal 101 can detect the 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 the SL HARQ feedback of the PSSCH is not detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on the fifth carrier, the DTX count based on the HARQ feedback corresponding to the fifth carrier associated with the first unicast connection is increased by 1. If the SL HARQ feedback of the PSSCH is detected at the PSFCH timing corresponding to the PSSCH associated with the first unicast connection on the fifth carrier, the DTX count based on the HARQ feedback corresponding to the fifth carrier associated with the first unicast connection is reinitialized to 0. If the DTX counts based on the HARQ feedback corresponding to the fifth carrier associated with the first unicast connection all reach the maximum value, SL RLF is triggered.

[0265] For example, the fifth carrier associated with the first unicast connection is carrier f3 and carrier f4. The SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f3. If the SL HARQ feedback of the PSSCH is not detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f3, the DTX count based on the HARQ feedback corresponding to carrier f3 is increased by 1. If the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f3, the DTX count based on the HARQ feedback corresponding to carrier f3 is reinitialized to 0; the SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f4. If the SL HARQ feedback of the PSSCH is not detected at the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f4, For HARQ feedback, the DTX count based on HARQ feedback corresponding to carrier f4 is increased by 1. If SL HARQ feedback of PSSCH is detected during the PSFCH opportunity corresponding to the PSSCH associated with the first unicast connection on carrier f4, the DTX count based on HARQ feedback corresponding to carrier f4 is reinitialized to 0. When the DTX count based on HARQ feedback for both carriers f3 and f4 reaches the maximum value, SL RLF is triggered.

[0266] In some embodiments, if the HARQ feedback-based DTX count corresponding to the fifth carrier associated with the first unicast connection is greater than a second threshold, it can be determined that a HARQ feedback-based SL RLF has occurred in the first unicast connection. Exemplarily, "greater than the second threshold" and "reaching the maximum value" in the above example can be interchangeable.

[0267] In some embodiments, the first terminal 101 may receive fourth configuration information sent by the network device, where the fourth configuration information may include a second threshold.

[0268] Exemplarily, if the first terminal 101 is in an RRC connected state, the first terminal 101 may receive the fourth configuration information sent by the network device through dedicated signaling. Exemplarily, if the first terminal 101 is in an RRC idle state or an RRC sleep state, the first terminal 101 may receive the fourth configuration information sent by the network device through the SIB. If the first terminal 101 is in OOC, the first terminal 101 may obtain the fourth configuration information through pre-configuration. That is, if the first terminal 101 is in an RRC connected state, the second threshold configured by the network device may be obtained through dedicated signaling. If the first terminal 101 is in an RRC idle state or an RRC sleep state, the second threshold configured by the network device may be obtained through the SIB. If the first terminal is in OOC, the second threshold may be obtained through pre-configuration.

[0269] The DTX counting method based on HARQ feedback involved in the embodiments of the present disclosure may include at least one of steps S3401 and S3402. For example, step S3401 may be implemented as an independent embodiment, and step S3402 may be implemented as an independent embodiment, but is not limited thereto.

[0270] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, and the optional methods or optional examples can be arbitrarily combined.

[0271] FIG4 is a flow chart of a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG4 , the embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used for the second terminal 102. The method includes:

[0272] Step S4101: Acquire sidelink data.

[0273] In some embodiments, the second terminal 102 can receive sidelink data sent by the first terminal 101, but is not limited to this and can also receive sidelink data sent by other entities.

[0274] For optional implementations of step S4101, reference may be made to the optional implementations of step S2102 in FIG. 2 and other related parts of the embodiment involved in FIG. 2 .

[0275] In this embodiment or example, the optional modes or optional examples may be arbitrarily combined unless there is any contradiction.

[0276] FIG5A is an interactive diagram illustrating a method for counting DTX based on HARQ feedback according to an embodiment of the present disclosure. As shown in FIG5A , the embodiment of the present disclosure relates to a method for counting DTX based on HARQ feedback, which is used in a communication system 100, wherein the communication system 100 includes a first terminal 101 and a second terminal 102. The method includes:

[0277] In step S5101 , the first terminal 101 selects or reselects a 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.

[0278] For optional implementations of step S5101 , reference may be made to the optional implementations of step S2101 in FIG. 2 and other related parts of the embodiment involved in FIG. 2 .

[0279] Step S5102: Perform DTX counting based on HARQ feedback on the fifth carrier.

[0280] For optional implementations of step S5102 , reference may be made to the optional implementations of step S2103 in FIG. 2 and other related parts of the embodiment involved in FIG. 2 .

[0281] In some embodiments, the above method may include the method described in the above embodiments of the communication system side, the first terminal side, the second terminal side, etc., which will not be repeated here.

[0282] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0283] The following is an exemplary introduction to the above method.

[0284] Optional embodiment: DTX counting based on HARQ feedback is performed on the intersection of the carrier / frequency band configured by the higher layer, the carrier / frequency band configured by the network device, and the carrier / frequency band selected (reselected) by the transmitting terminal.

[0285] Example 1: The upper layer provides the AS layer with a mapping relationship from service to frequency, and the upper layer provides the AS layer with a mapping relationship from service to destination layer 2ID (Destination L2ID). Exemplarily, the upper layer provides the AS layer with a mapping relationship from QoS flow to frequency. The AS layer can obtain a mapping relationship from layer 2ID to frequency. Exemplarily, the layer 2ID is associated with a first unicast connection. Exemplarily, the layer 2ID is associated with a receiving terminal of the first unicast connection. Exemplarily, the upper layer is a V2X layer. For example, for layer 2 address A, the address A is associated with the first unicast connection, and address A brings down three QoS flows from the upper layer. The upper layer provides the following mapping relationships from QoS flow to frequency (flow1, f1, f2, f3) (flow2, f1, f2, f3, f4) (flow3, f2, f3, f4), and the AS layer obtains the mapping from address A to frequency as (A, f1, f2, f3, f4).

[0286] Example 2: The carrier / frequency band configured by the network device. Exemplarily, the transmitting terminal in the RRC connected state obtains the carrier / frequency band configured by the network through dedicated signaling. Exemplarily, the transmitting terminal in the RRC IDLE / INACTIVE state obtains the carrier / frequency band configured by the network through SIB. Exemplarily, the transmitting terminal in the OOC state obtains the carrier / frequency band configured by the network through pre-configuration.

[0287] Embodiment 3: The carrier selected by the transmitting terminal is one or more carriers selected based on the carrier measurement CBR and / or the carriers supported by the transmitting terminal and / or the carriers supported by the receiving terminal. Exemplarily, the carrier / frequency band supported by the transmitting terminal refers to the carrier / frequency band supported by the transmitting terminal for sending and / or receiving, and exemplary, the carrier / frequency band supported by the receiving terminal refers to the carrier / frequency band supported by the receiving terminal for sending and / or receiving, and exemplary, the carrier / frequency band supported by the transmitting terminal and the receiving terminal refers to the intersection of the carrier / frequency band supported by the transmitting terminal and the carrier / frequency band supported by the receiving terminal, for example, the intersection of the carrier / frequency band supported by the transmitting terminal for sending and the carrier / frequency band supported by the receiving terminal for receiving.

[0288] Optionally, the carrier measured CBR is less than or equal to the CBR threshold. When the measured CBRs of multiple carriers are less than or equal to the CBR threshold, the terminal device selects a carrier from the multiple carriers in order of CBR from low to high.

[0289] Example 4: For the first unicast connection, the transmitting terminal performs DTX counting based on HARQ feedback on the intersection of the carrier / frequency band configured by the higher layer, the carrier / frequency band configured by the network device, and the carrier / frequency band selected (reselected) by the transmitting terminal. For example, for layer 2 address A, the AS layer determines the carrier / frequency band mapped to layer 2 address A as (f1, f2, f3, f4). According to Example 2, the carrier / frequency band configured by the network device is determined to be (f2, f3, f4, f5). According to Example 3, the carriers selected based on CBR and / or carriers supported by the transmitting terminal and / or 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.

[0290] Optional embodiment: The transmitting terminal performs DTX counting based on HARQ feedback on the carrier / frequency band associated with the PC5-RRC connection selected (reselected).

[0291] 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 carrier / frequency band configured by the higher layer and the carrier / frequency band configured by the network device. A carrier is selected or reselected based on the intersection of these factors, and DTX counting based on HARQ feedback is performed on the carrier associated with the PC5-RRC connection. For example, for layer 2 address A, the AS layer determines the carrier / frequency band mapped to layer 2 address A as (f1, f2, f3, f4). According to embodiment 2, the carrier / frequency band configured by the network device is determined to be (f2, f3, f4, f5). When selecting or reselecting a carrier in embodiment 3, the carriers f2, f3, and f4 are selected, and the carriers supported by the transmitting terminal and the carriers supported by the receiving terminal are determined to be f3 and f4. f3 and f4 are associated with the PC5-RRC connection between the transmitting terminal and the receiving terminal, and the transmitting terminal performs DTX counting based on HARQ feedback on f3 and f4.

[0292] Exemplarily, DTX counting based on HARQ feedback is performed on the carrier associated with this L2ID or PC5-RRC connection selected (reselected) by the UE.

[0293] It should be noted that, in the present disclosure, the DTX count based on HARQ feedback and the DTX number based on HARQ feedback can be replaced with each other.

[0294] In the embodiments of the present disclosure, 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 of other embodiments.

[0295] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0296] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0297] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution 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 relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by 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 implementing the hardware circuit configuration 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. In addition, 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), a deep learning processing unit (DPU), etc.

[0298] Figure 6 is a structural diagram of the first terminal proposed in an embodiment of the present disclosure. As shown in Figure 6, 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 used for a processing module, which is used to select or reselect the fifth carrier associated with the first unicast connection according to 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 triggers carrier selection or reselection, the target address or the SL LCH that triggers 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 used to receive the first configuration information sent by the network device, wherein the first configuration information includes the first threshold. Optionally, the transceiver module is configured to execute at least one of the communication steps (e.g., step S2102, but not limited thereto) such as sending and / or receiving performed by the first terminal 101 in any of the above methods, and will not be described in detail here. Optionally, the processing module is configured to execute at least one of the other steps (e.g., step S2101, but not limited thereto) performed by the first terminal 101 in any of the above methods, and will not be described in detail here.

[0299] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0300] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0301] Figure 7A is a schematic diagram of the structure of a communication device 7100 proposed in an embodiment of the present disclosure. Communication device 7100 can be a network device (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. Communication device 7100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0302] As shown in FIG7A , the communication device 7100 includes one or more processors 7101. The processor 7101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control a communication device (e.g., a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. The communication device 7100 is used to perform any of the above methods.

[0303] 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 be located outside the communication device 7100.

[0304] In some embodiments, the communication device 7100 further includes one or more transceivers 7103. When the communication device 7100 includes one or more transceivers 7103, the transceiver 7103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2102, but not limited thereto), and the processor 7101 performs at least one of the other steps (for example, step S2101, but not limited thereto).

[0305] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0306] 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. The interface circuit 7104 may be configured to receive signals from the memory 7102 or other devices, and may be configured to send signals to the memory 7102 or other devices. For example, the interface circuit 7104 may read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0307] The communication device 7100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 7100 described in the present disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0308] 7B is a schematic diagram of the structure of a chip 7200 proposed in an embodiment of the present disclosure. If the communication device 7100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 7200 shown in FIG7B , but the present disclosure is not limited thereto.

[0309] The chip 7200 includes one or more processors 7201 , and the chip 7200 is configured to execute any of the above methods.

[0310] In some embodiments, the chip 7200 further includes one or more interface circuits 7202. Optionally, the interface circuit 7202 is connected to the memory 7203. The interface circuit 7202 can be used to receive signals from the memory 7203 or other devices, and can be used to send signals to the memory 7203 or other devices. For example, the interface circuit 7202 can read instructions stored in the memory 7203 and send the instructions to the processor 7201.

[0311] In some embodiments, the interface circuit 7202 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2102, but not limited to this), and the processor 7201 performs at least one of the other steps (for example, step S2101, but not limited to this).

[0312] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0313] In some embodiments, the chip 7200 further includes one or more memories 7203 for storing instructions. Alternatively, all or part of the memories 7203 may be located outside the chip 7200.

[0314] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 7100, the communication device 7100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a temporary storage medium.

[0315] The present disclosure also provides a program product, which, when executed by the communication device 7100, enables the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0316] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A method for counting discontinuous reception (DTX) based on hybrid automatic repeat request (HARQ) feedback, characterized in that: The method is performed by a first terminal and includes: Select or reselect a fifth carrier associated with the first unicast connection according to 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; Performing DTX counting based on HARQ feedback on the fifth carrier; Among them, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that triggers carrier selection or reselection, the target address or the SL LCH that triggers 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.

2. The method according to claim 1, characterized in that The selecting or reselecting a fifth carrier associated with the first unicast connection according to 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; The fifth carrier is selected or reselected according to the first intersection.

3. The method according to claim 2, characterized in that The selecting or reselecting the fifth carrier according to the first intersection includes: Determine a carrier in the first intersection whose measured channel occupancy rate CBR is less than or equal to a first threshold as a first candidate carrier; The fifth carrier is selected or reselected from the first candidate carriers.

4. The method according to claim 3, characterized in that Also includes: Receive first configuration information sent by the network device, wherein the first configuration information includes the first threshold.

5. The method according to claim 4, characterized in that The receiving the first configuration information sent by the network device includes any one of the following: Receiving the first configuration information sent by the network device through dedicated signaling, the first terminal is in a radio resource control RRC connected state; Receiving the first configuration information sent by the network device through a system message block SIB, where the first terminal is in an RRC idle state or an RRC dormant state; The first configuration information is obtained through pre-configuration, and the first terminal is in out-of-coverage (OOC).

6. The method according to claim 2, characterized in that The selecting or reselecting the fifth carrier according to the first intersection includes: Determine a carrier in the first intersection as a second candidate carrier; The fifth carrier is selected or reselected from the second candidate carriers.

7. The method according to any one of claims 2 to 6, characterized in that The determining a first intersection of at least one of the first carrier, the second carrier, the third carrier, and the fourth carrier includes: An intersection of the first carrier, the second carrier, the third carrier, and the fourth carrier is determined as the first intersection.

8. The method according to any one of claims 1 to 7, characterized in that Also includes: receiving second configuration information of a high layer of the first terminal, wherein the second configuration information includes 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; The first carrier is determined according to the second configuration information.

9. The method according to any one of claims 1 to 8, characterized in that Also includes: receiving third configuration information of a high layer of the first terminal, wherein the third configuration information includes a mapping relationship between a first service and the target address and / or a mapping relationship between the first service and a carrier, and the first service is a unicast service; The first carrier is determined according to third configuration information.

10. The method according to any one of claims 1 to 9, characterized in that The third carrier is a carrier supported by the first terminal for sending and / or receiving, and the fourth carrier is a carrier supported by the second terminal for receiving and / or sending.

11. The method according to any one of claims 1 to 10, characterized in that The performing DTX counting based on HARQ feedback on the fifth carrier includes: Detecting SL HARQ feedback of a physical sidelink shared channel PSSCH corresponding to the physical sidelink shared channel PSSCH associated with the first unicast connection on each of the fifth carriers on a physical sidelink feedback channel PSFCH opportunity; If no SL HARQ feedback of the PSSCH is detected at the PSFCH timing, adding 1 to the DTX count based on the HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection; The SL HARQ feedback of the PSSCH is detected at the PSFCH opportunity, and the DTX count based on the HARQ feedback corresponding to each of the fifth carriers associated with the first unicast connection is reinitialized to 0.

12. The method according to any one of claims 1 to 11, characterized in that Also includes: The DTX count based on HARQ feedback corresponding to the fifth carrier is greater than or equal to the second threshold, determining that a side link radio link failure SL RLF based on HARQ feedback occurs in the first unicast connection.

13. The method according to claim 12, characterized in that Also includes: Receive fourth configuration information sent by the network device, wherein the fourth configuration information includes the second threshold.

14. The method according to claim 13, characterized in that The receiving fourth configuration information sent by the network device includes any one of the following: receiving the fourth configuration information sent by the network device through dedicated signaling, the first terminal being in an RRC connected state; Receiving the fourth configuration information sent by the network device through the SIB, where the first terminal is in an RRC idle state or an RRC dormant state; The fourth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

15. The method according to any one of claims 1 to 14, characterized in that Also includes: Indication information sent by the second terminal is received, wherein the indication information is used to indicate the fourth carrier supported by the second terminal.

16. The method according to any one of claims 1 to 15, characterized in that Also includes: Fifth configuration information sent by the network device is received, wherein the fifth configuration information includes the second carrier.

17. The method according to claim 16, characterized in that The receiving fifth configuration information sent by the network device includes any one of the following: receiving the fifth configuration information sent by the network device through dedicated signaling, the first terminal being in an RRC connected state; receiving the fifth configuration information sent by the network device through the SIB, where the first terminal is in an RRC idle state or an RRC dormant state; The fifth configuration information is obtained through pre-configuration, and the first terminal is in OOC.

18. A first terminal, characterized in that: include: a processing module, configured to select or reselect a fifth carrier associated with the first unicast connection according to 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; and perform DTX counting based on HARQ feedback on the fifth carrier; Among them, the first carrier is the carrier corresponding to the target address or the carrier corresponding to the side link logical channel SL LCH that triggers carrier selection or reselection, the target address or the SL LCH that triggers 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.

19. 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 1-17.

20. A communication system, characterized in that: Comprising a terminal, wherein the first terminal is configured to implement the DTX counting method based on HARQ feedback according to any one of claims 1-17.

21. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is enabled to execute the DTX counting method based on HARQ feedback according to any one of claims 1 to 17.

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