Method and apparatus for determining radio link failure, device, and storage medium

Abstract

A method and apparatus for determining a radio link failure, a device, and a storage medium, relating to the technical field of communications. The method comprises: if the value of a DTX counter on at least one target carrier among a plurality of carriers is greater than or equal to a first threshold, a first terminal device determines that a radio link failure occurs (610). The present application provides a method for determining a radio link failure in an SL CA scenario, so that a terminal device can determine whether a multi-carrier link fails, thereby releasing related configurations and resources in a timely manner.

Description

Method, device, equipment and storage medium for determining wireless link failure Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to a method, apparatus, device, and storage medium for determining wireless link failure. Background Art

[0002] In SL (Sidelink) communication, terminal devices may communicate with each other in a CA (Carrier Aggregation) manner.

[0003] In this scenario, how the terminal device determines that the wireless link has failed requires further study.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a method, apparatus, device, and storage medium for determining a wireless link failure. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a method for determining radio link failure is provided. The method is performed by a first terminal device, where the first terminal device transmits data to a second terminal device on multiple carriers through carrier aggregation. The method includes:

[0007] If the value of a DTX (Discontinuous Transmission) counter on at least one target carrier among the multiple carriers is greater than or equal to a first threshold, it is determined that the radio link has failed.

[0008] According to one aspect of an embodiment of the present application, a method for determining radio link failure is provided. The method is performed by a first terminal device, where the first terminal device transmits data to a second terminal device on multiple carriers through carrier aggregation. The method includes:

[0009] If there is no response to the heartbeat packet on at least one target carrier among the multiple carriers, it is determined that the wireless link has failed.

[0010] According to one aspect of an embodiment of the present application, a device for determining radio link failure is provided, the device being configured in a first terminal device, the first terminal device transmitting data to a second terminal device on multiple carriers through carrier aggregation; the device comprising:

[0011] The processing module is configured to determine that a radio link fails when a value of a DTX counter on at least one target carrier among the multiple carriers is greater than or equal to a first threshold.

[0012] According to one aspect of an embodiment of the present application, a device for determining radio link failure is provided, the device being configured in a first terminal device, the first terminal device transmitting data to a second terminal device on multiple carriers through carrier aggregation; the device comprising:

[0013] The processing module is configured to determine that the radio link fails when there is no response to the heartbeat packet on at least one target carrier among the multiple carriers.

[0014] According to one aspect of an embodiment of the present application, a terminal device is provided, comprising a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the above-mentioned method for determining wireless link failure.

[0015] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is used to be executed by a processor to implement the above-mentioned method for determining wireless link failure.

[0016] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions. When the chip is running, it is used to implement the above-mentioned method for determining wireless link failure.

[0017] According to one aspect of an embodiment of the present application, a computer program product is provided, which includes a computer program stored in a computer-readable storage medium, and a processor reads and executes the computer program from the computer-readable storage medium to implement the above-mentioned method for determining wireless link failure.

[0018] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0019] The embodiments of the present application provide a method for determining wireless link failure based on a DTX counter or a heartbeat packet in an SL CA scenario, so that a terminal device can determine whether a multi-carrier link has failed and release related configurations and resources in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0021] FIG2 is a schematic diagram of transmission between terminal devices through carrier aggregation provided by one embodiment of the present application;

[0022] FIG3 is a schematic diagram of HARQ feedback in SL CA provided by one embodiment of the present application;

[0023] FIG4 is a schematic diagram of a SL UE sending a heartbeat packet according to an embodiment of the present application;

[0024] FIG5 is a schematic diagram of DTX counter maintenance in SL CA provided by one embodiment of the present application;

[0025] FIG6 is a flowchart of a method for determining a radio link failure according to an embodiment of the present application;

[0026] FIG7 is a schematic diagram of DTX counter maintenance in the same-carrier feedback mode provided by an embodiment of the present application;

[0027] FIG8 is a schematic diagram of DTX counter maintenance in a cross-carrier feedback mode provided by an embodiment of the present application;

[0028] FIG9 is a schematic diagram of DTX counter maintenance in a cross-carrier feedback mode provided by another embodiment of the present application;

[0029] FIG10 is a schematic diagram of carrier reselection provided by one embodiment of the present application;

[0030] FIG11 is a flowchart of a method for determining a radio link failure according to another embodiment of the present application;

[0031] 12 is a schematic diagram of determining wireless link failure based on a heartbeat packet according to an embodiment of the present application;

[0032] 13 is a schematic diagram of determining wireless link failure based on a heartbeat packet according to another embodiment of the present application;

[0033] FIG14 is a block diagram of an apparatus for determining a radio link failure according to an embodiment of the present application;

[0034] FIG15 is a block diagram of an apparatus for determining a radio link failure according to another embodiment of the present application;

[0035] FIG16 is a schematic structural diagram of a terminal device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0037] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0038] Please refer to Figure 1, which shows a schematic diagram of a network architecture provided by an embodiment of the present application. The network architecture may include: a core network 11, an access network 12, and a terminal device 13.

[0039] The core network 11 includes several core network devices. The functions of the core network devices are mainly to provide user connections, user management, and service carrying, and to provide an interface to the external network as a bearer network. For example, the core network of a 5G (5th Generation) NR (New Radio) system may include devices such as an AMF (Access and Mobility Management Function) entity, a UPF (User Plane Function) entity, and an SMF (Session Management Function) entity.

[0040] The access network 12 includes several access network devices 14. The access network in the 5G NR system can be called NG-RAN (New Generation-Radio Access Network). The access network device 14 is a device deployed in the access network 12 to provide wireless communication functions for the terminal device 13. The access network device 14 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5G NR system, they are called gNodeB or gNB. With the evolution of communication technology, the name of "access network device" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 13 are collectively referred to as access network devices.

[0041] The number of terminal devices 13 is usually multiple, and one or more terminal devices 13 can be distributed in the cell managed by each access network device 14. The terminal device 13 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile stations (MS), etc. For the convenience of description, the devices mentioned above are collectively referred to as terminal devices. The access network device 14 and the core network device communicate with each other through some air technology, such as the NG interface in the 5G NR system. The access network device 14 and the terminal device 13 communicate with each other through some air technology, such as the Uu interface. The "terminal device" in the embodiment of the present application may also be referred to as a terminal or UE, which express the same meaning.

[0042] Terminal devices 13 and terminal devices 13 (for example, vehicle-mounted devices and other devices (such as other vehicle-mounted devices, mobile phones, RSU (Road Side Unit), etc.)) can communicate with each other through a direct communication interface (such as PC5 (ProSe Communication 5, neighbor communication fifth interface) interface). Accordingly, the communication link established based on the direct communication interface can be called a direct link or SL. SL transmission is the direct communication and data transmission between terminal devices through a side link. Unlike traditional cellular systems where communication data is received or sent through access network equipment, SL transmission has the characteristics of short delay and low overhead, and is suitable for communication between two terminal devices that are geographically close (such as vehicle-mounted devices and other peripheral devices that are geographically close). It should be noted that in Figure 1, only vehicle-to-vehicle communication in the V2X (vehicle to everything) scenario is used as an example. SL technology can be applied to scenarios where direct communication is carried out between various terminal devices. In other words, the terminal device in this application refers to any device that communicates using SL technology.

[0043] The "5G NR system" in the embodiments of this application may also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in the embodiments of this application can be applied to the 5G NR system and can also be applied to subsequent evolution systems of the 5G NR system.

[0044] Before introducing the technical solutions of this application, we first introduce and explain some of the relevant technical knowledge involved in this application. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least part of the following contents.

[0045] 1.SL transmission

[0046] Regarding SL transmission, 3GPP (3rd Generation Partnership Project) defines two transmission modes: Mode A and Mode B.

[0047] Mode A: The transmission resources of the terminal device are allocated by the access network device (such as a base station). The terminal device transmits communication data on the side link according to the transmission resources allocated by the access network device. The access network device can allocate transmission resources for a single transmission to the terminal device, or allocate transmission resources for a semi-static transmission to the terminal device.

[0048] Mode B: The terminal device selects a transmission resource from the resource pool to transmit communication data. Specifically, the terminal device can select a transmission resource from the resource pool by listening or by random selection.

[0049] 2. SL CA (Carrier Aggregation)

[0050] Carrier aggregation refers to the process of combining multiple carriers and using them simultaneously for data transmission, increasing transmission bandwidth and thus improving data rates. LTE V2X already supports LTE-based sidelink carrier aggregation (Sidelink CA). NR Sidelink is also considering supporting sidelink carrier aggregation. This is intended to support high-speed scenarios such as advanced driving and extended sensing, and to leverage fragmented spectrum resources and improve spectrum efficiency. For example, Figure 2 shows a schematic diagram of inter-device transmission using carrier aggregation. Device 1 aggregates four 20MHz carriers, transmitting data to device 2 using an 80MHz bandwidth. The carriers involved in carrier aggregation can be within the same frequency band or different bands, a technique known as intra-band carrier aggregation or inter-band carrier aggregation. For example, carriers 1 through 4 in Figure 2 can be within the same frequency band or different bands. At the same time, the SCS (sub-carrier space) on each carrier can be the same or different.

[0051] 3. Carrier Reselection in SL CA

[0052] In LTE-V2X, each logical channel corresponds to one or more carriers. When data exists in a logical channel, carrier selection or reselection is triggered in the following three situations:

[0053] (1) There are no sidelink transmission resources on the carrier corresponding to the logical channel;

[0054] (2) Sidelink transmission resources exist on a carrier corresponding to the logical channel, and resource selection or resource reselection is triggered on the carrier;

[0055] (3) The terminal device transmits a single MAC (Medium Access Control) PDU (Protocol Data Unit).

[0056] For ease of understanding, a logical channel can be understood as the interface between the RLC (Radio Link Control) layer and the MAC layer, carrying different services. A MAC PDU can correspond to one or more logical channels. For example, a MAC PDU can be understood as a data packet, and a logical channel can be understood as the data of different services contained in this data packet.

[0057] When carrier selection or reselection is triggered:

[0058] If no sidelink transmission resources exist on any carrier corresponding to the logical channel, for each carrier corresponding to the logical channel, if the CBR (Channel Busy Ratio) measured on the carrier is less than a threshold U, the corresponding carrier is selected as a candidate carrier. The threshold U is related to the priority of the logical channel.

[0059] Otherwise, if there are sidelink transmission resources on a carrier corresponding to the logical channel, carrier selection or reselection is triggered on the carrier. For each logical channel L with data allowed on the carrier,

[0060] If the CBR measured on the carrier is less than the threshold Y, the carrier is selected as the carrier of the logical channel L. The threshold Y is related to the priority of the logical channel L.

[0061] Otherwise, for each carrier corresponding to the logical channel L, if the CBR measured on the carrier is less than the threshold P, the corresponding carrier is used as a candidate carrier for the logical channel L. The threshold P is related to the priority of the logical channel L.

[0062] After performing the above operations, for each logical channel with data, if one or more carriers are considered as candidate carriers, one or more carriers are selected from the candidate carriers in descending order of CBR. The specific number of carriers selected depends on the capabilities of the terminal device.

[0063] 4. HARQ (Hybrid Automatic Repeat reQuest) feedback in SL CA

[0064] When HARQ feedback is activated, the receiver provides either an ACK (Acknowledgement) or a NACK (Negative Acknowledgement) based on whether the transmission was received successfully. ACK indicates successful reception, while NACK indicates failed reception. The receiver provides HARQ feedback to the transmitter via the PSFCH (Physical Sidelink Feedback Channel).

[0065] PSFCH resources are configured for each resource pool. In NR SL, there are three configurations: N = 1, N = 2, and N = 4. N = 1 means that every time slot in the resource pool is configured with a PSFCH resource, N = 2 means that every two time slots in the resource pool are configured with a PSFCH resource, and N = 4 means that every four time slots in the resource pool are configured with a PSFCH resource. In NR SL, PSFCH resources are configured in the penultimate symbol of the symbols available for SL transmission within a time slot. As shown in Figure 3 (a), on carriers 1 and 2, assuming that all time slots are within the resource pool, PSFCH resources are configured every four time slots.

[0066] There is a correspondence between the resources for PSCCH / PSSCH transmission and the PSFCH resources. When UE 1 sends data to UE 2 on the PSSCH resources in time slot t, the HARQ feedback from UE 2 to UE 1 for this data transmission occurs in time slot t+a. Where a is greater than or equal to k, and time slot t+a contains PSFCH resources, and k in NR SL is 2 or 3 time slots. For example, in carrier 1 of sub-figure (a) of Figure 3, assuming N=4 and k=2, if UE 1 sends data to UE 2 in time slot 1, t+a is time slot 4, and UE 2 performs HARQ feedback to UE 1 in time slot 4. If UE 1 sends data to UE 2 in time slot 3, t+a is time slot 8, and UE 2 performs HARQ feedback to UE 1 in time slot 8.

[0067] In the carrier aggregation scenario, PSFCH resources can be configured on each carrier or only on some of them. Accordingly, HARQ information can be fed back independently on each carrier or only on some of them. As shown in sub-figure (a) of Figure 3, assume that UE 1 sends data to UE 2 via carrier 1 and carrier 2, PSFCH resources are configured on both carrier 1 and carrier 2, N=4 and k=2, UE 1 transmits data to UE 2 on resource 1 of carrier 1, then UE 2 provides HARQ feedback to UE 1 on PSFCH in time slot 8 of carrier 1, and UE 1 transmits data to UE 2 on resource 2 of carrier 2, then UE 2 provides HARQ feedback to UE 1 on PSFCH in time slot 8 of carrier 2. For another example, in sub-figure (b) of Figure 3, assume that UE 1 sends data to UE 2 via carrier 1 and carrier 2, and PSFCH resources are configured only on carrier 1. UE 1 transmits data to UE 2 on resource 1 of carrier 1 and transmits data to UE 2 on resource 2 of carrier 2. UE 2 provides HARQ feedback information corresponding to the data on resource 1 and resource 2 to UE 1 on the PSFCH resource in time slot 8 of carrier 1. It should be noted that in sub-figure (a), since each carrier provides independent feedback, the PSFCH only needs to carry one bit of ACK or NACK feedback information. In sub-figure (b), since data from multiple carriers is fed back on the same carrier, the PSFCH may need to carry more than one bit of ACK or NACK feedback information.

[0068] 5. SL PC5 Interface Radio Link Monitoring (RLM) / Radio Link Failure (RLF)

[0069] For unicast links, a necessary function is wireless link monitoring to determine wireless link failure. That is, when a problem occurs in the link between two UEs, for example, the two UEs are far away from each other, or the two UEs cannot communicate with each other due to obstruction, the active link resources and configurations need to be released.

[0070] There are several solutions to this problem:

[0071] Solution 1: As shown in Figure 4, two UEs monitor each other's UE status by sending KeepAlive signaling (such as DIRECT_COMMUNICATION_KEEPALIVE), which is similar to a heartbeat packet. If the other UE does not respond to the above signaling within a certain period of time (T4101) (such as the other UE does not respond to DIRECT_COMMUNICATION_KEEPALIVE_ACK), it means that the link between the two UEs has RLF. Otherwise, it means that the link between the two UEs is in normal status.

[0072] Solution 2: Determine whether RLF occurs based on the HARQ feedback reception status corresponding to the data transmission. Specifically, the transmitter determines whether the sidelink is interrupted based on whether DTX occurs continuously during data transmission.

[0073] The so-called DTX means that the transmitter sends data, but the receiver does not receive the data and therefore does not provide HARQ feedback to the transmitter, or the receiver receives data and sends HARQ feedback to the transmitter, but the HARQ feedback is not detected by the transmitter. Therefore, from the perspective of the transmitter, it is manifested as that HARQ feedback should be received but is not received on the corresponding PSFCH resource.

[0074] A DTX counter is maintained between two UEs with a unicast link. If DTX occurs, that is, no HARQ feedback is detected on the PSFCH corresponding to the PSSCH, the counter is incremented by 1. Otherwise, the counter is set to 0. If the counter reaches the configured threshold, it indicates that RLF has occurred. For example, the initial DTX counters of UE 1 and UE 2 are 0, assuming the configured threshold is 2. UE 1 sends data to UE 2 on PSSCH 1. UE 1 does not detect HARQ feedback on PSFCH 1 corresponding to PSSCH 1, and the DTX counter becomes 1. Subsequently, UE 1 sends data to UE 2 on PSSCH 2. UE 1 detects HARQ feedback on PSFCH 2 corresponding to PSSCH 2, and the DTX counter becomes 0. UE 1 then sends data to UE 2 on PSSCH 3 and 4. UE 1 does not detect HARQ feedback information on PSFCH 3 and 4, which correspond to PSSCH 3 and 4. The DTX counter then increments by 1 to 2. At this point, the DTX counter reaches the configured threshold, and UE 1 determines that RLF has occurred. As can be seen from the above example, RLF occurs when the number of consecutive DTXs equals the configured threshold. Therefore, this DTX counter is also referred to as the consecutive DTX count or consecutive DTX counter.

[0075] The standard is currently discussing carrier aggregation for NR SL. The scenario is limited to intra-band carrier aggregation (CA), and PSFCH resources are independently configured on each carrier. The receiver independently provides HARQ feedback on the corresponding carrier for the data transmitted by the transmitter on each carrier. This NR SL CA scenario also involves the determination of radio link failure. The current standard has agreed to maintain DTX counters on multiple carriers. When the DTX counters of multiple carriers reach the configured threshold, RLF is determined.

[0076] For example, as shown in Figure 5, terminal device 1 sends data to terminal device 2 through carrier aggregation, and maintains DTX counters on the four carriers for carrier aggregation. When the DTX counters of multiple carriers reach the configured threshold, RLF is determined. Specifically, assume that the DTX counters on carriers 1-4 are initially 0, and the configured threshold is 2. Since DTX continues to occur on carrier 1, at time t1, the DTX counter on carrier 1 reaches 2, but since the DTX counters of other carriers have not reached 2, terminal device 1 does not consider that RLF has occurred. When DTX continues to occur on carrier 1, the DTX counter continues to increase to 3 and 4 in sequence. At time t2, the DTX counters on other carriers also reach 2, that is, the DTX counters on all carriers reach 2, and terminal device 1 will determine RLF.

[0077] The above method is currently applicable to the scenario where Intra-band CA and each carrier performs HARQ feedback independently. For the scenario of Inter-band CA (inter-band carrier aggregation) and cross-carrier HARQ feedback, whether the above scheme needs to enhance the standard has not yet been discussed. At the same time, how to apply the method of determining RLF through KeepAlive signaling to the standard in the CA scenario has not been discussed. In addition, there are certain problems with this mechanism. For example, the transmission quality on carrier 1 is poor and DTX always occurs. The DTX counter reaches the configured value, but DTX does not occur on other carriers. This will result in the inability to transmit effective data on carrier 1, but the terminal device neither reselects the carrier for the data transmitted on carrier 1 in time, nor determines RLF to release the transmission.

[0078] Please refer to Figure 6, which shows a flow chart of a method for determining radio link failure provided by an embodiment of the present application. The method can be performed by a first terminal device. The method may include the following steps:

[0079] Step 610: If the value of the DTX counter on at least one target carrier among the multiple carriers is greater than or equal to the first threshold, the first terminal device determines that the radio link has failed.

[0080] The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation. In some embodiments, the multiple carriers are located in the same frequency band (intra-band CA). In some embodiments, the multiple carriers are located in different frequency bands (inter-band CA). In some embodiments, a unicast link or a PC5-RRC (Radio Resource Control) link exists between the first terminal device and the second terminal device.

[0081] In some embodiments, the HARQ feedback information corresponding to the data transmitted by the first terminal device on the aforementioned multiple carriers is fed back by the second terminal device on the corresponding carrier. That is, the second terminal device performs HARQ feedback on the data transmitted by the first terminal device on the first carrier. The first carrier can be any one of the aforementioned multiple carriers. This HARQ feedback mode can be called a same-carrier feedback mode.

[0082] Exemplarily, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3, respectively, and the second terminal device accordingly performs HARQ feedback to the first terminal device on carriers 1, 2, and 3, respectively. Specifically, the first terminal device transmits data to the second terminal device on carrier 1, and the second terminal device accordingly performs HARQ feedback to the first terminal device on the same carrier 1. The first terminal device transmits data to the second terminal device on carrier 2, and the second terminal device accordingly performs HARQ feedback to the first terminal device on the same carrier 2. The first terminal device transmits data to the second terminal device on carrier 3, and the second terminal device accordingly performs HARQ feedback to the first terminal device on the same carrier 3.

[0083] In some embodiments, the HARQ feedback information corresponding to data transmitted by the first terminal device on different carriers among the multiple carriers can be fed back by the second terminal device on the same carrier. That is, for data transmitted by the first terminal device on a first carrier, the second terminal device can provide HARQ feedback on a second carrier. The first carrier and the second carrier can be two different carriers. This HARQ feedback mode can be called a cross-carrier feedback mode.

[0084] Exemplarily, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3 respectively. The second terminal device performs HARQ feedback on the data on carriers 1 and 2 on carrier 1, and performs HARQ feedback on the data on carrier 3 on carrier 3.

[0085] In some embodiments, the aforementioned data is carried by the PSSCH, and the HARQ feedback information is carried by the PSFCH. For intra-carrier feedback mode, each PSFCH resource carries only 1 bit of feedback information. For cross-carrier feedback, the PSFCH resource is allowed to carry more than 1 bit of feedback information. In other words, a PSFCH resource can carry 1 bit of feedback information or more than 1 bit of feedback information.

[0086] The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation, and the target carrier is a carrier among the multiple carriers. The number of target carriers may be one or more. In some embodiments, the target carrier is all or part of the multiple carriers. For example, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3 respectively, and the target carrier may be part of the multiple carriers, such as the target carrier is carrier 1, or the target carrier is carrier 1 and carrier 3; the target carrier may also be all the carriers among the multiple carriers, that is, the target carrier is carrier 1, 2, and 3.

[0087] In some embodiments, the first terminal device maintains a DTX counter on all carriers performing carrier aggregation or data transmission. That is, when the first terminal device transmits data to the second terminal device on multiple carriers using carrier aggregation, the first terminal device maintains a DTX counter on each of the multiple carriers. For example, when the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3, the first terminal device maintains a corresponding DTX counter on each of the carriers.

[0088] In some embodiments, the first terminal device maintains a DTX counter on at least a target carrier. The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation. When the target carrier is all carriers among the multiple carriers, it is equivalent to the first terminal device maintaining the DTX counter on all carriers performing carrier aggregation or data transmission; when the target carrier is part of the multiple carriers, the first terminal device may maintain the DTX counter on all carriers performing carrier aggregation or data transmission, or may maintain the DTX counter only on the target carrier.

[0089] In some embodiments, the first terminal device maintains a DTX counter on the target carrier, and may or may not maintain a DTX counter on carriers other than the target carrier in the plurality of carriers. Whether the DTX counter is maintained or not maintained on carriers other than the target carrier in the plurality of carriers may depend on the implementation of the first terminal device.

[0090] Exemplarily, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3, and the target carrier is carrier 1. The first terminal device can maintain the corresponding DTX counter only on carrier 1, or can maintain the corresponding DTX counter on carrier 1 and at least one other carrier (such as carrier 2 and / or carrier 3).

[0091] In addition, maintaining a DTX counter on a certain carrier mentioned in this application may also refer to configuring a DTX counter on the carrier.

[0092] In some embodiments, there are multiple target carriers, and the multiple target carriers may be located in the same frequency band or in different frequency bands.

[0093] In some embodiments, the target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

[0094] In some embodiments, the target carrier is a carrier configured with PSFCH resources. For example, the first terminal device transmits data to the second terminal device via carriers 1, 2, and 3, and PSFCH resources are configured on carriers 1 and 2, then the target carriers are carriers 1 and 2.

[0095] In some embodiments, the target carrier is a carrier used for synchronization. For example, if a first terminal device transmits data to a second terminal device via carriers 1, 2, and 3, and the first terminal device and the second terminal device synchronize according to a synchronization signal on carrier 1, then the target carrier is carrier 1.

[0096] In some embodiments, the target carrier is a carrier for performing CSI (Channel State Information) measurement and feedback. For example, a first terminal device transmits data to a second terminal device via carriers 1, 2, and 3. The first terminal device sends a CSI-RS (Channel State Information-Reference Signal) on carrier 1. The second terminal device performs measurements based on the CSI-RS on carrier 1 and feeds back CSI on carrier 1. The target carrier is carrier 1.

[0097] In some embodiments, the target carrier is a primary carrier (Primary cell / carrier). For example, the first terminal device transmits data to the second terminal device through carriers 1, 2, and 3, and carrier 1 is the primary carrier instead of the secondary carrier (Secondary cell / carrier), then the target carrier is carrier 1. For example, the first terminal device can transmit configuration signaling on the primary carrier, such as PC5-RRC signaling. For example, time-frequency resources on other carriers can be scheduled or indicated on the primary carrier. For example, the signal transmitted by the first terminal device on the primary carrier can be used to sleep or activate transmission on other carriers.

[0098] In some embodiments, the target carrier includes at least one carrier in each frequency band. For example, if a first terminal device transmits data to a second terminal device via carriers 1, 2, and 3, where carriers 1 and 2 are in band 1 and carrier 3 is in band 2, then the target carriers are carriers 1 and 3, or alternatively, the target carriers are carriers 2 and 3.

[0099] In some embodiments, there are multiple target carriers. If the values ​​of the DTX counters on the multiple target carriers are all greater than or equal to a first threshold, the first terminal device determines that the radio link has failed. The first thresholds corresponding to the multiple target carriers are the same, or the first thresholds corresponding to the multiple target carriers are different.

[0100] In some embodiments, the first threshold is configured by the network, or preconfigured, or predefined by a protocol, or depends on the implementation of the first terminal device.

[0101] The following describes the maintenance process of the DTX counter.

[0102] In some embodiments, a PSFCH resource corresponds to one or more PSSCH resources. After the first terminal device transmits data on any PSSCH resource, if the first terminal device does not detect HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, the first terminal device increases the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located; if the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, the first terminal device sets the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located to 0.

[0103] In some embodiments, a PSFCH resource corresponds to one or more PSSCH resources. For any PSSCH resource, the HARQ feedback information corresponding to the data transmitted on the PSSCH resource is transmitted on the PSFCH resource corresponding to the PSSCH resource. Based on this, after the first terminal device transmits data on any PSSCH resource, the first terminal device can detect the HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource.

[0104] In some embodiments, for the same-carrier feedback mode introduced above, one PSFCH resource corresponds to one PSSCH resource, and the PSFCH resource and its corresponding PSSCH resource are located on the same carrier. After the first terminal device transmits data on any PSSCH resource, if the first terminal device does not detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the first terminal device adds 1 to the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located; if the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the first terminal device sets the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located to 0. In some embodiments, when a DTX counter is configured or maintained on the carrier where the PSSCH is located, the value of the DTX counter is added by 1 or set to 0 when the above conditions are met.

[0105] As shown in Figure 7, the first terminal device maintains a DTX counter on carrier 1 and carrier 2. Assume that the time slots in Figure 7 are all time slots in the resource pool, PSFCH resources are configured every four time slots, k=2, and the initial value of the DTX counter is 0.

[0106] For carrier 1, in time slot 2, the first terminal device sends data to the second terminal device on resource 1. If no HARQ feedback information is received in time slot 4, the DTX counter becomes 1. In time slot 7, the first terminal device sends data to the second terminal device on resource 2. If no HARQ feedback information is received in time slot 12, the DTX counter becomes 2. In time slot 14, the first terminal device sends data to the second terminal device on resource 3. If HARQ feedback information is received in time slot 16, the DTX counter becomes 0.

[0107] For carrier 2, in time slot 9, the first terminal device sends data to the second terminal device on resource 4, and no HARQ feedback is received in time slot 12, then the DTX counter becomes 1. In time slot 13, the first terminal device sends data to the second terminal device on resource 5, and HARQ feedback information is received in time slot 16, then the DTX counter becomes 0.

[0108] In some embodiments, for the cross-carrier feedback mode introduced above, one PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located on different carriers. After the first terminal device transmits data on any PSSCH resource, if the first terminal device does not detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the first terminal device adds 1 to the value of the DTX counter on the carrier where the PSSCH resource is located; if the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the first terminal device sets the value of the DTX counter on the carrier where the PSSCH resource is located to 0. In some embodiments, when a DTX counter is configured or maintained on the carrier where the PSSCH is located, the value of the DTX counter is added by 1 or set to 0 when the above conditions are met.

[0109] As shown in Figure 8, the first terminal device maintains a DTX counter on carrier 1 and carrier 2. It is assumed that the time slots in Figure 8 are all time slots in the resource pool, PSFCH resources are configured every four time slots on carrier 1, k=2, and PSFCH resources are not configured on carrier 2. The initial value of the DTX counter is 0.

[0110] The first terminal device sends data to the second terminal device on resource 1 of time slot 2 of carrier 2. The PSFCH resource corresponding to resource 1 is the PSFCH resource of time slot 4 of carrier 1. If no HARQ feedback information is received on the PSFCH resource of time slot 4 of carrier 1, the DTX counter on carrier 2 becomes 1.

[0111] The first terminal device sends data to the second terminal device on resource 2 of time slot 7 of carrier 1, and the first terminal device sends data to the second terminal device on resource 4 of time slot 9 of carrier 2. Both resource 2 and resource 4 correspond to the PSFCH resource of time slot 12 of carrier 1, that is, HARQ feedback for the data transmitted on resource 4 is performed on carrier 1. If the first terminal device does not detect any HARQ feedback information on the PSFCH resource of time slot 12 of carrier 1, the DTX counter on carrier 1 becomes 1, and the DTX counter on carrier 2 becomes 2.

[0112] The first terminal device sends data to the second terminal device on resource 3 in time slot 14 of carrier 1, and the first terminal device sends data to the second terminal device on resource 5 in time slot 13 of carrier 2. Both resource 3 and resource 5 correspond to the PSFCH resource in time slot 16 of carrier 1. That is, HARQ feedback for the data transmitted on resource 5 is performed on carrier 1. On the PSFCH resource in time slot 16 of carrier 1, the first terminal device only detects HARQ feedback information for the data transmitted on resource 5 and does not detect HARQ feedback information for the data transmitted on resource 3. The DTX counter on carrier 1 then becomes 2, while the DTX counter on carrier 2 becomes 0.

[0113] In some embodiments, for the cross-carrier feedback mode introduced above, one PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located on different carriers. After the first terminal device transmits data on any PSSCH resource, if the first terminal device does not detect any HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the first terminal device increases the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located; if the first terminal device detects any HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the first terminal device sets the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located to 0. In some embodiments, when the DTX counter is configured or maintained on the carrier where the PSFCH is located, the value of the DTX counter is increased or set to 0 when the above conditions are met.

[0114] Exemplarily, when one PSFCH resource corresponds to N PSSCH resources, if the HARQ feedback information of the data transmitted on the N PSSCH resources is not detected, the value of the DTX counter on the carrier where the PSFCH is located is increased by 1 or N, where N is an integer greater than or equal to 1.

[0115] Exemplarily, when a PSFCH resource corresponds to N PSSCH resources, if at least one of the HARQ feedback information of the data transmitted on the N PSSCH resources is detected on the PSFCH resource, the value of the DTX counter on the carrier where the PSFCH is located is set to 0, and N is an integer greater than or equal to 1.

[0116] As shown in Figure 9, the first terminal device maintains a DTX counter on carrier 1. Assume that the time slots in Figure 9 are all time slots in the resource pool, PSFCH resources are configured every four time slots on carrier 1, k=2, and no PSFCH resources are configured on carrier 2. The initial value of the DTX counter is 0.

[0117] The first terminal device sends data to the second terminal device on resource 1 of time slot 2 of carrier 2. The PSFCH resource corresponding to resource 1 is the PSFCH resource of time slot 4 of carrier 1. If no HARQ feedback information is received on the PSFCH resource of time slot 4 of carrier 1, the DTX counter on carrier 1 becomes 1.

[0118] The first terminal device sends data to the second terminal device on resource 2 of time slot 7 of carrier 1, and the first terminal device sends data to the second terminal device on resource 4 of time slot 9 of carrier 2. Both resource 2 and resource 4 correspond to the PSFCH resource of time slot 12 of carrier 1, that is, HARQ feedback for the data transmitted on resource 4 is performed on carrier 1. The first terminal device does not detect any HARQ feedback information on the PSFCH resource of time slot 12 of carrier 1, and the DTX counter on carrier 1 becomes 2.

[0119] The first terminal device sends data to the second terminal device on resource 3 of time slot 14 of carrier 1, and the first terminal device sends data to the second terminal device on resource 5 of time slot 13 of carrier 2. Resource 3 and resource 5 both correspond to the PSFCH resource of time slot 16 of carrier 1, that is, the HARQ feedback of the data transmitted on resource 5 is performed on carrier 1. The first terminal device only detects the HARQ feedback information of the data transmitted on resource 5 on the PSFCH resource of time slot 16 of carrier 1, and does not detect the HARQ feedback information of the data transmitted on resource 3. Then, the DTX counter on carrier 1 becomes 0.

[0120] In some embodiments, for any target carrier, if the value of the DTX counter on the target carrier is greater than or equal to a second threshold, the first terminal device triggers carrier reselection.

[0121] In some embodiments, if the value of the DTX counter on the target carrier is greater than or equal to a second threshold and the first condition is met, the first terminal device triggers carrier reselection; wherein the first condition includes: the first terminal device has not determined that the wireless link has failed, or there is at least one other target carrier on which the value of the DTX counter is less than the first threshold.

[0122] In some embodiments, triggering carrier reselection by the first terminal device refers to reselecting a target carrier. For example, re-determining a carrier for transmitting data on the target carrier. In some embodiments, the data on the target carrier refers to a logical channel transmitted on the target carrier.

[0123] In some embodiments, for any target carrier, when carrier reselection is triggered, for any logical channel L carried on the target carrier, for each carrier corresponding to the logical channel L, if the CBR measured on the carrier is less than a threshold value U, the corresponding carrier is selected as a candidate carrier. Threshold U is related to the priority of the logical channel. Among the determined candidate carriers, the transmission carriers for the logical channel L are determined in ascending order of CBR. The number of determined carriers depends on the capabilities of the first terminal device. In some embodiments, the determined transmission carriers do not include the target carrier.

[0124] In some embodiments, the second threshold is configured by the network, or preconfigured, or predefined by a protocol, or depends on the implementation of the first terminal device.

[0125] In some embodiments, the second threshold is equal to the first threshold, or the second threshold is greater than the first threshold. In some embodiments, the second threshold is the same as the first threshold, meaning that the second threshold and the first threshold are the same threshold, and only one threshold needs to be configured, defined, or determined. In some embodiments, the second threshold and the first threshold are different thresholds, and both thresholds need to be configured, defined, or determined. The second threshold can be greater than or equal to the first threshold.

[0126] In some embodiments, the second threshold is determined based on the first threshold. For example, the first threshold is added to the first offset to obtain the second threshold. The first offset may be configured by the network, preconfigured, predefined by the protocol, or depend on the implementation of the first terminal device.

[0127] As shown in Figure 10, the first terminal device transmits data to the second terminal device through carrier 1-4, and the target carrier is carrier 1-4. The first terminal device maintains a DTX counter on carrier 1-4, with a first threshold of 2 and a second threshold of 4. Since DTX continues to occur on carrier 1, at time t1, the DTX counter on carrier 1 reaches the first threshold, but the DTX counter on carrier 2-4 does not reach the first threshold, so the first terminal device does not determine RLF. At time t2, the DTX counter on carrier 1 reaches the second threshold, while the DTX counter on carrier 2-4 does not reach the first threshold (that is, the first terminal device still does not determine RLF at time t2), and the first terminal device reselects carrier 1. For any logical channel L on carrier 1, assuming that its corresponding carrier is carrier 1-3, and the CBR measured by the first terminal device on carrier 1-3 is less than the threshold U, then carrier 1-3 is the candidate carrier of logical channel L. Among carriers 1-3, the first terminal device selects carriers 2 and 3 as the transmission carriers of logical channel L in order of CBR from low to high.

[0128] The technical solution provided in the embodiment of the present application provides a method for determining wireless link failure based on the DTX counter in the SL CA scenario, so that the terminal device can determine whether the multi-carrier link has failed and release related configurations and resources in a timely manner.

[0129] In addition, for the same-carrier feedback mode and the cross-carrier feedback mode, corresponding methods for determining wireless link failure based on the DTX counter are proposed, so that the terminal device can determine whether the multi-carrier link has failed in the above two modes and release related configurations and resources in time.

[0130] In addition, a carrier reselection mechanism is designed to ensure transmission reliability when a certain carrier continuously experiences DTX.

[0131] Please refer to Figure 11, which shows a flow chart of a method for determining radio link failure provided by another embodiment of the present application. The method can be performed by a first terminal device. The method can include the following step 1110.

[0132] Step 1110: If there is no response to the heartbeat packet on at least one target carrier among the multiple carriers, the first terminal device determines that the wireless link has failed.

[0133] The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation. In some embodiments, the multiple carriers are located in the same frequency band (intra-band CA). In some embodiments, the multiple carriers are located in different frequency bands (inter-band CA). In some embodiments, a unicast link or a PC5-RRC (Radio Resource Control) link exists between the first terminal device and the second terminal device.

[0134] The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation, and the target carrier is a carrier among the multiple carriers. The number of target carriers may be one or more. In some embodiments, the target carrier is all or part of the multiple carriers. For example, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3 respectively, and the target carrier may be part of the multiple carriers, such as the target carrier is carrier 1, or the target carrier is carrier 1 and carrier 3; the target carrier may also be all the carriers among the multiple carriers, that is, the target carrier is carrier 1, 2, and 3.

[0135] In some embodiments, the first terminal device transmits heartbeat packets on all carriers performing carrier aggregation or data transmission. That is, the first terminal device transmits data to the second terminal device on multiple carriers using carrier aggregation, and the first terminal device transmits a heartbeat packet on each of the multiple carriers. For example, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3, and the first terminal device transmits heartbeat packets on each of the carriers.

[0136] In some embodiments, the first terminal device sends a heartbeat packet on at least a target carrier. The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation. When the target carrier is all of the multiple carriers, it is equivalent to the first terminal device sending heartbeat packets on all carriers performing carrier aggregation or data transmission; when the target carrier is part of the multiple carriers, the first terminal device may send heartbeat packets on all carriers performing carrier aggregation or data transmission, or may send heartbeat packets only on the target carrier.

[0137] In some embodiments, the first terminal device sends a heartbeat packet on the target carrier, and may or may not send a heartbeat packet on carriers other than the target carrier among the multiple carriers. Whether to send a heartbeat packet on carriers other than the target carrier among the multiple carriers or not to send a heartbeat packet may depend on the implementation of the first terminal device.

[0138] Exemplarily, the first terminal device transmits data to the second terminal device on carriers 1, 2, and 3, and the target carrier is carrier 1. The first terminal device can send heartbeat packets only on carrier 1, or can send heartbeat packets on carrier 1 and at least one other carrier (such as carrier 2 and / or carrier 3).

[0139] In some embodiments, the first terminal device periodically sends heartbeat packets. For example, the first terminal device periodically sends heartbeat packets on the target carrier. The period of the heartbeat packets may be configured by the network, preconfigured, predefined by the protocol, or depend on the implementation of the first terminal device.

[0140] In some embodiments, the heartbeat packet is transmitted in a resource pool.

[0141] In some embodiments, when the first terminal device sends heartbeat packets on multiple carriers, the first terminal device may send the heartbeat packets on the multiple carriers simultaneously, or may send the heartbeat packets on at least two of the multiple carriers at different time points.

[0142] In some embodiments, a heartbeat packet is a signaling used to monitor the status of a peer device between two communicating parties. For example, the heartbeat packet can be the KeepAlive signaling described above, such as DIRECT_COMMUNICATION_KEEPALIVE; accordingly, the response information corresponding to the heartbeat packet can be the response information corresponding to the KeepAlive signaling, such as DIRECT_COMMUNICATION_KEEPALIVE_ACK. In the embodiments of the present application, the specific signaling used for the heartbeat packet is not limited; any signaling that can achieve the purpose of monitoring the status of a peer device between two communicating parties can be regarded as a heartbeat packet.

[0143] In some embodiments, there are multiple target carriers, and the multiple target carriers may be located in the same frequency band or in different frequency bands.

[0144] In some embodiments, the target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

[0145] In some embodiments, the target carrier is a carrier configured with PSFCH resources. For example, the first terminal device transmits data to the second terminal device via carriers 1, 2, and 3, and PSFCH resources are configured on carriers 1 and 2, then the target carriers are carriers 1 and 2.

[0146] In some embodiments, the target carrier is a carrier used for synchronization. For example, if a first terminal device transmits data to a second terminal device via carriers 1, 2, and 3, and the first terminal device and the second terminal device synchronize according to a synchronization signal on carrier 1, then the target carrier is carrier 1.

[0147] In some embodiments, the target carrier is a carrier for performing CSI (Channel State Information) measurement and feedback. For example, a first terminal device transmits data to a second terminal device via carriers 1, 2, and 3. The first terminal device sends a CSI-RS (Channel State Information-Reference Signal) on carrier 1. The second terminal device performs measurements based on the CSI-RS on carrier 1 and feeds back CSI on carrier 1. The target carrier is carrier 1.

[0148] In some embodiments, the target carrier is a primary carrier (Primary cell / carrier). For example, the first terminal device transmits data to the second terminal device through carriers 1, 2, and 3, and carrier 1 is the primary carrier instead of the secondary carrier (Secondary cell / carrier), then the target carrier is carrier 1. For example, the first terminal device can transmit configuration signaling on the primary carrier, such as PC5-RRC signaling. For example, time-frequency resources on other carriers can be scheduled or indicated on the primary carrier. For example, the signal transmitted by the first terminal device on the primary carrier can be used to sleep or activate transmission on other carriers.

[0149] In some embodiments, the target carrier includes at least one carrier in each frequency band. For example, if a first terminal device transmits data to a second terminal device via carriers 1, 2, and 3, where carriers 1 and 2 are in band 1 and carrier 3 is in band 2, then the target carriers are carriers 1 and 3, or alternatively, the target carriers are carriers 2 and 3.

[0150] In some embodiments, there are multiple target carriers. If there is no response to the heartbeat packets on multiple target carriers, the first terminal device determines that the wireless link has failed. Exemplarily, for any target carrier, the first terminal device sends a heartbeat packet (such as KeepAlive signaling) to the second terminal device on the target carrier. If the second terminal device does not respond to the heartbeat packet sent by the first terminal device within the first time range, it is recorded as the heartbeat packet is not responded. The above-mentioned first time range is configured by the network, or pre-configured, or predefined by the protocol, or depends on the implementation of the first terminal device. That is, when multiple target carriers are in a state of unresponsive heartbeat packets, the first terminal device determines that the wireless link has failed. In some embodiments, the second terminal device responds on the same carrier that receives the heartbeat packet.

[0151] As shown in Figure 12, the first terminal device transmits data to the second terminal device via carrier 1-4, with carrier 1-4 being the target carrier. The first terminal device periodically sends KeepAlive signaling to the second terminal device on carrier 1-4. At time t1, the first terminal device does not receive a response from the second terminal device for the KeepAlive signaling on carrier 1, but receives a response from the second terminal device for the KeepAlive signaling on carriers 2-4. The first terminal device does not determine RLF. At time t2, the first terminal device does not receive a response from the second terminal device for the KeepAlive signaling on carriers 1-4, and the first terminal device determines RLF.

[0152] As shown in Figure 13, the first terminal device transmits data to the second terminal device via carriers 1-4. The target carrier is carrier 1, which is the primary carrier. The first terminal device periodically sends KeepAlive signaling to the second terminal device on carrier 1. At time t1, the first terminal device receives a response from the second terminal device for the KeepAlive signaling on carrier 1, and the first terminal device does not determine RLF. At time t2, the first terminal device does not receive a response from the second terminal device for the KeepAlive signaling on carrier 1, and the first terminal device determines RLF.

[0153] The technical solution provided in the embodiment of the present application provides a method for determining wireless link failure based on heartbeat packets in the SL CA scenario, so that the terminal device can determine whether the multi-carrier link has failed and release related configurations and resources in a timely manner.

[0154] The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0155] Please refer to Figure 14, which shows a block diagram of a device for determining a radio link failure provided by an embodiment of the present application. The device has the function of implementing the above-mentioned method example on the first terminal device side, and the function can be implemented by hardware, or by executing corresponding software implementation by hardware. The device can be the first terminal device introduced above, or it can be set in the first terminal device. The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation. As shown in Figure 14, the device 1400 may include: a processing module 1410.

[0156] The processing module 1410 is configured to determine that a radio link fails when a value of a DTX counter on at least one target carrier among the multiple carriers is greater than or equal to a first threshold.

[0157] In some embodiments, the target carrier is all or part of the multiple carriers.

[0158] In some embodiments, the target carrier is a carrier configured with PSFCH resources; or

[0159] The target carrier is a carrier used for synchronization; or,

[0160] The target carrier is a carrier for performing CSI measurement and feedback; or,

[0161] The target carrier is a main carrier; or

[0162] The target carrier includes at least one carrier in each frequency band.

[0163] In some embodiments, the target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

[0164] In some embodiments, the DTX counter is maintained on at least the target carrier.

[0165] In some embodiments, the number of the target carriers is multiple;

[0166] The processing module 1410 is configured to determine that a radio link fails when the values ​​of the DTX counters on the plurality of target carriers are all greater than or equal to a first threshold.

[0167] In some embodiments, the first thresholds corresponding to the multiple target carriers are the same; or, the first thresholds corresponding to the multiple target carriers are different.

[0168] In some embodiments, one PSFCH resource corresponds to one or more PSSCH resources; the processing module 1410 is further configured to:

[0169] After the first terminal device transmits data on any PSSCH resource,

[0170] In a case where the first terminal device does not detect HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, increase the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located;

[0171] When the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located is set to 0.

[0172] In some embodiments, one PSFCH resource corresponds to one PSSCH resource, and the PSFCH resource and its corresponding PSSCH resource are located on the same carrier;

[0173] The processing module 1410 is configured to, when the first terminal device does not detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, add 1 to the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located;

[0174] The processing module 1410 is used to set the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located to 0 when the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource.

[0175] In some embodiments, one PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located on different carriers;

[0176] The processing module 1410 is configured to, when the first terminal device does not detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, increase the value of the DTX counter on the carrier where the PSSCH resource is located by 1;

[0177] The processing module 1410 is used to set the value of the DTX counter on the carrier where the PSSCH resource is located to 0 when the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource.

[0178] In some embodiments, one PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located on different carriers;

[0179] The processing module 1410 is configured to increase the value of a DTX counter on a carrier where the PSFCH resource corresponding to the PSSCH resource is located when the first terminal device does not detect any HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource;

[0180] The processing module 1410 is used to set the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located to 0 when the first terminal device detects HARQ feedback information corresponding to any data on the PSFCH resource corresponding to the PSSCH resource.

[0181] In some embodiments, the processing module 1410 is further configured to trigger carrier reselection for any one of the target carriers when the value of the DTX counter on the target carrier is greater than or equal to a second threshold.

[0182] In some embodiments, the processing module 1410 is configured to trigger carrier reselection if the value of the DTX counter on the target carrier is greater than or equal to a second threshold and the first condition is met;

[0183] The first condition includes: the first terminal device has not determined that the radio link has failed, or there is at least one other target carrier whose DTX counter value is less than the first threshold.

[0184] In some embodiments, the second threshold is equal to the first threshold, or the second threshold is greater than the first threshold.

[0185] In some embodiments, the multiple carriers are located in the same frequency band, or the multiple carriers are located in different frequency bands.

[0186] Please refer to Figure 15, which shows a block diagram of a device for determining a radio link failure provided by another embodiment of the present application. The device has the function of implementing the above-mentioned method example on the first terminal device side, and the function can be implemented by hardware, or by executing corresponding software implementation by hardware. The device can be the first terminal device introduced above, or it can be set in the first terminal device. The first terminal device transmits data to the second terminal device on multiple carriers by means of carrier aggregation. As shown in Figure 15, the device 1500 may include: a processing module 1510.

[0187] The processing module 1510 is configured to determine that the radio link fails when there is no response to the heartbeat packet on at least one target carrier among the multiple carriers.

[0188] In some embodiments, the target carrier is all or part of the multiple carriers.

[0189] In some embodiments, the target carrier is a carrier configured with PSFCH resources; or

[0190] The target carrier is a carrier used for synchronization; or,

[0191] The target carrier is a carrier for performing CSI measurement and feedback; or,

[0192] The target carrier is a main carrier; or

[0193] The target carrier includes at least one carrier in each frequency band.

[0194] In some embodiments, the target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

[0195] In some embodiments, the heartbeat packet is sent on at least the target carrier.

[0196] In some embodiments, the number of the target carriers is multiple;

[0197] The processing module 1510 is configured to determine that the wireless link fails when there is no response to the heartbeat packets on the multiple target carriers.

[0198] In some embodiments, the multiple carriers are located in the same frequency band, or the multiple carriers are located in different frequency bands.

[0199] It should be noted that the device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to implement its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0200] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0201] Please refer to FIG16 , which shows a schematic diagram of the structure of a terminal device provided by an embodiment of the present application. The terminal device 1600 may include: a processor 1601 , a transceiver 1602 , and a memory 1603 .

[0202] The processor 1601 includes one or more processing cores, and the processor 1601 executes various functional applications and information processing by running software programs and modules. Exemplarily, the processor 1601 is used to implement the functions implemented by the processing module in the above-mentioned device embodiment.

[0203] The transceiver 1602 may include a receiver and a transmitter. For example, the receiver and the transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0204] The memory 1603 may be connected to the processor 1601 and the transceiver 1602 .

[0205] The memory 1603 may be used to store a computer program executed by the processor, and the processor 1601 is used to execute the computer program to implement each step in the above method embodiment.

[0206] In some embodiments, taking terminal device 1600 as the first terminal device in the above embodiment as an example, the first terminal device transmits data to the second terminal device on multiple carriers through carrier aggregation.

[0207] In some embodiments, the processor 1601 is configured to determine that the radio link has failed if a value of a DTX counter on at least one target carrier among the multiple carriers is greater than or equal to a first threshold.

[0208] In some embodiments, the processor 1601 is configured to determine that the radio link has failed if there is no response to a heartbeat packet on at least one target carrier among the multiple carriers.

[0209] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0210] In addition, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static access memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0211] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a terminal device to implement the above-mentioned method for determining wireless link failure.

[0212] In some embodiments, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives), or an optical disk, etc. Among them, the random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0213] An embodiment of the present application also provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a terminal device, it is used to implement the above-mentioned method for determining wireless link failure.

[0214] An embodiment of the present application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. The processor of the terminal device reads and executes the computer program from the computer-readable storage medium to implement the above-mentioned method for determining wireless link failure.

[0215] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0216] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0217] In this document, "plurality" refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0218] In addition, the step numbers described in this document only illustrate a possible execution order between the steps. In some other embodiments, the above steps may not be executed in the order of the numbers, such as two steps with different numbers are executed at the same time, or two steps with different numbers are executed in the opposite order of the diagram. The embodiments of the present application are not limited to this.

[0219] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0220] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for determining wireless link failure, characterized in that: The method is performed by a first terminal device, and the first terminal device transmits data to a second terminal device on multiple carriers by means of carrier aggregation; the method includes: If the value of the discontinuous transmission DTX counter on at least one target carrier among the multiple carriers is greater than or equal to a first threshold, it is determined that the radio link fails.

2. The method according to claim 1, characterized in that The target carrier is all or part of the multiple carriers.

3. The method according to claim 1 or 2, characterized in that: The target carrier is a carrier configured with a physical side feedback channel PSFCH resource; or, The target carrier is a carrier used for synchronization; or, The target carrier is a carrier for performing channel state information CSI measurement and feedback; or, The target carrier is a main carrier; or, The target carrier includes at least one carrier in each frequency band.

4. The method according to any one of claims 1 to 3, characterized in that: The target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

5. The method according to any one of claims 1 to 4, characterized in that: The DTX counter is maintained on at least the target carrier.

6. The method according to any one of claims 1 to 5, characterized in that: The number of the target carriers is multiple; If the value of the DTX counter on at least one target carrier among the multiple carriers is greater than or equal to the first threshold, determining that the radio link fails includes: If the values ​​of the DTX counters on the multiple target carriers are all greater than or equal to the first threshold, it is determined that the radio link has failed.

7. The method according to claim 6, characterized in that The first thresholds corresponding to the multiple target carriers are the same; or, The first thresholds corresponding to the multiple target carriers are different.

8. The method according to any one of claims 1 to 7, characterized in that: One PSFCH resource corresponds to one or more physical sidelink shared channel PSSCH resources; the method further includes: After the first terminal device transmits data on any PSSCH resource, If the first terminal device does not detect hybrid automatic repeat request HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, increase the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located; If the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located is set to 0.

9. The method according to claim 8, characterized in that One PSFCH resource corresponds to one PSSCH resource, and the PSFCH resource and its corresponding PSSCH resource are located on the same carrier; If the first terminal device does not detect HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, increasing the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located, including: If the first terminal device does not detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, then add 1 to the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located; If the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located is set. The value is set to 0, including: If the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located is set to 0.

10. The method according to claim 8, characterized in that One PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located in different carriers; If the first terminal device does not detect HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, increasing the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located, including: If the first terminal device does not detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, add 1 to the value of the DTX counter on the carrier where the PSSCH resource is located; If the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, setting the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located to 0 includes: If the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, the value of the DTX counter on the carrier where the PSSCH resource is located is set to 0.

11. The method according to claim 8, characterized in that One PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located in different carriers; If the first terminal device does not detect HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, increasing the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located, including: If the first terminal device does not detect any HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource, increase the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located; If the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, setting the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located to 0 includes: If the first terminal device detects HARQ feedback information corresponding to any data on the PSFCH resource corresponding to the PSSCH resource, the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located is set to 0.

12. The method according to any one of claims 1 to 11, characterized in that: The method further comprises: For any one of the target carriers, if the value of the DTX counter on the target carrier is greater than or equal to the second threshold, carrier reselection is triggered.

13. The method according to claim 12, characterized in that If the value of the DTX counter on the target carrier is greater than or equal to the second threshold, triggering carrier reselection includes: If the value of the DTX counter on the target carrier is greater than or equal to the second threshold and the first condition is met, triggering carrier reselection; The first condition includes: the first terminal device has not determined that the radio link has failed, or there is at least one other target carrier whose DTX counter value is less than the first threshold.

14. The method according to claim 12 or 13, characterized in that The second threshold is equal to the first threshold, or the second threshold is greater than the first threshold.

15. The method according to any one of claims 1 to 14, characterized in that The multiple carriers are located in the same frequency band, or the multiple carriers are located in different frequency bands.

16. A method for determining wireless link failure, characterized in that: The method is performed by a first terminal device, and the first terminal device transmits data to a second terminal device on multiple carriers by means of carrier aggregation; the method includes: If there is no response to the heartbeat packet on at least one target carrier among the multiple carriers, it is determined that the wireless link fails.

17. The method according to claim 16, characterized in that The target carrier is all or part of the multiple carriers.

18. The method according to claim 16 or 17, characterized in that The target carrier is a carrier configured with a physical side feedback channel PSFCH resource; or, The target carrier is a carrier used for synchronization; or, The target carrier is a carrier for performing channel state information CSI measurement and feedback; or, The target carrier is a main carrier; or, The target carrier includes at least one carrier in each frequency band.

19. The method according to any one of claims 16 to 18, characterized in that The target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

20. The method according to any one of claims 16 to 19, characterized in that The heartbeat packet is sent on at least the target carrier.

21. The method according to any one of claims 16 to 20, characterized in that The number of the target carriers is multiple; If there is no response to the heartbeat packet on at least one target carrier among the multiple carriers, determining that the wireless link fails includes: If there is no response to the heartbeat packets on the multiple target carriers, it is determined that the wireless link fails.

22. The method according to any one of claims 16 to 21, characterized in that The multiple carriers are located in the same frequency band, or the multiple carriers are located in different frequency bands.

23. A device for determining wireless link failure, characterized in that: The apparatus is arranged in a first terminal device, and the first terminal device transmits data to a second terminal device on multiple carriers by means of carrier aggregation; the apparatus includes: The processing module is used to determine that the radio link fails when the value of the discontinuous transmission DTX counter on at least one target carrier among the multiple carriers is greater than or equal to a first threshold.

24. The device according to claim 23, characterized in that The target carrier is all or part of the multiple carriers.

25. The device according to claim 23 or 24, characterized in that The target carrier is a carrier configured with a physical side feedback channel PSFCH resource; or, The target carrier is a carrier used for synchronization; or, The target carrier is a carrier for performing channel state information CSI measurement and feedback; or, The target carrier is a main carrier; or, The target carrier includes at least one carrier in each frequency band.

26. The device according to any one of claims 23 to 25, characterized in that The target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

27. The device according to any one of claims 23 to 26, characterized in that The DTX counter is maintained on at least the target carrier.

28. The device according to any one of claims 23 to 27, characterized in that The number of the target carriers is multiple; The processing module is used to determine that the radio link fails when the values ​​of the DTX counters on the multiple target carriers are greater than or equal to the first threshold.

29. The device according to claim 28, characterized in that The first thresholds corresponding to the multiple target carriers are the same; or, The first thresholds corresponding to the multiple target carriers are different.

30. The device according to any one of claims 23 to 29, characterized in that One PSFCH resource corresponds to one or more physical sidelink shared channel PSSCH resources; the processing module is also used for: After the first terminal device transmits data on any PSSCH resource, In a case where the first terminal device does not detect hybrid automatic repeat request HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, increase the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located; When the first terminal device detects HARQ feedback information on the PSFCH resource corresponding to the PSSCH resource, the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located is set to 0.

31. The device according to claim 30, characterized in that One PSFCH resource corresponds to one PSSCH resource, and the PSFCH resource and its corresponding PSSCH resource are located on the same carrier; The processing module is used to add 1 to the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located when the first terminal device fails to detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource; The processing module is used to set the value of the DTX counter on the carrier where the PSSCH resource or the PSFCH resource corresponding to the PSSCH resource is located to 0 when the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource.

32. The device according to claim 30, characterized in that One PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located in different carriers; The processing module is used to add 1 to the value of the DTX counter on the carrier where the PSSCH resource is located when the first terminal device fails to detect the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource; The processing module is used to set the value of the DTX counter on the carrier where the PSSCH resource is located to 0 when the first terminal device detects the HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource.

33. The device according to claim 30, characterized in that One PSFCH resource corresponds to one or more PSSCH resources, and the PSFCH resource and its corresponding at least one PSSCH resource are located in different carriers; The processing module is used to increase the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located when the first terminal device does not detect any HARQ feedback information corresponding to the data on the PSFCH resource corresponding to the PSSCH resource; The processing module is used to set the value of the DTX counter on the carrier where the PSFCH resource corresponding to the PSSCH resource is located to 0 when the first terminal device detects HARQ feedback information corresponding to any data on the PSFCH resource corresponding to the PSSCH resource.

34. The device according to any one of claims 23 to 33, characterized in that The processing module is further configured to trigger carrier reselection for any one of the target carriers when the value of the DTX counter on the target carrier is greater than or equal to a second threshold.

35. The device according to claim 34, characterized in that The processing module is configured to trigger carrier reselection when the value of the DTX counter on the target carrier is greater than or equal to the second threshold and the first condition is met; The first condition includes: the first terminal device has not determined that the radio link has failed, or there is at least one other target carrier whose DTX counter value is less than the first threshold.

36. The device according to claim 34 or 35, characterized in that The second threshold is equal to the first threshold, or the second threshold is greater than the first threshold.

37. The device according to any one of claims 23 to 36, characterized in that The multiple carriers are located in the same frequency band, or the multiple carriers are located in different frequency bands.

38. A device for determining wireless link failure, characterized in that: The apparatus is arranged in a first terminal device, and the first terminal device transmits data to a second terminal device on multiple carriers by means of carrier aggregation; the apparatus includes: The processing module is used to determine that the wireless link fails when there is no response to the heartbeat packet on at least one target carrier among the multiple carriers.

39. The device according to claim 38, characterized in that The target carrier is all or part of the multiple carriers.

40. The device according to claim 38 or 39, characterized in that The target carrier is a carrier configured with a physical side feedback channel PSFCH resource; or, The target carrier is a carrier used for synchronization; or, The target carrier is a carrier for performing channel state information CSI measurement and feedback; or, The target carrier is a main carrier; or, The target carrier includes at least one carrier in each frequency band.

41. The device according to any one of claims 38 to 40, characterized in that The target carrier is configured by the network, or pre-configured, or pre-defined by a protocol, or depends on the implementation of the first terminal device.

42. The device according to any one of claims 38 to 41, characterized in that The heartbeat packet is sent on at least the target carrier.

43. The device according to any one of claims 38 to 42, characterized in that The number of the target carriers is multiple; The processing module is used to determine that the wireless link fails when there is no response to the heartbeat packets on multiple target carriers.

44. The device according to any one of claims 38 to 43, characterized in that The multiple carriers are located in the same frequency band, or the multiple carriers are located in different frequency bands.

45. A terminal device, characterized in that: The terminal device includes a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the method according to any one of claims 1 to 15, or to implement the method according to any one of claims 16 to 22.

46. ​​A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 15, or to implement the method according to any one of claims 16 to 22.

47. A chip, characterized in that: The chip includes a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the method according to any one of claims 1 to 15, or to implement the method according to any one of claims 16 to 22.

48. A computer program product, characterized in that The computer program product comprises a computer program, which is stored in a computer-readable storage medium. A processor reads and executes the computer program from the computer-readable storage medium to implement the method according to any one of claims 1 to 15, or to implement the method according to any one of claims 16 to 22.

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