Radio link recovery method and terminal devices

Abstract

The present application provides a radio link recovery method and terminal devices. The method comprises: a terminal device acquires a first parameter of a serving cell and / or an LTM candidate cell, the first parameter being used for representing the channel quality of the serving cell and / or the LTM candidate cell; and, on the basis of the first parameter of the serving cell and / or the LTM candidate cell, the terminal device determines whether to perform a radio link recovery operation. On the basis of the first parameter of the LTM candidate cell and / or the serving cell, the embodiments of the present application can predetermine the condition of channel deterioration, so as to perform the radio link recovery operation earlier, thus helping to shorten the time during which the terminal device is located in scenarios having poor channel connections, and facilitating rapid recovery of radio links.

Description

Wireless link recovery method and terminal equipment Technical Field

[0001] The present application relates to the field of communication technology, and more specifically to a wireless link recovery method and terminal equipment. Background Art

[0002] Release 18 introduced Layer 1 / Layer 2-triggered mobility (LTM), which allows a terminal device to change its serving cell while maintaining the higher-layer configuration. However, LTM may fail when channel conditions deteriorate. In this case, how to quickly restore the wireless link becomes a pressing issue.

[0003] Summary of the Invention

[0004] The present application provides a wireless link recovery method and terminal device. The following introduces various aspects involved in the present application.

[0005] In the first aspect, an embodiment of the present application provides a wireless link recovery method, which includes: a terminal device obtains a first parameter of a service cell and / or an LTM candidate cell, wherein the first parameter is used to characterize the channel quality of the service cell and / or the LTM candidate cell; the terminal device determines whether to perform a wireless link recovery operation based on the first parameter of the service cell and / or the LTM candidate cell.

[0006] In the second aspect, an embodiment of the present application provides a terminal device, which includes: an acquisition unit for acquiring a first parameter of a service cell and / or an LTM candidate cell, wherein the first parameter is used to characterize the channel quality of the service cell and / or the LTM candidate cell; and a determination unit for determining whether to perform a wireless link recovery operation based on the first parameter of the service cell and / or the LTM candidate cell.

[0007] In a third aspect, an embodiment of the present application provides a terminal device comprising a processor and a memory, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes some or all of the steps in the method of the first aspect.

[0008] In a fourth aspect, an embodiment of the present application provides a device comprising a processor for calling a program from a memory to execute the method described in the first aspect.

[0009] In a fifth aspect, an embodiment of the present application provides a chip comprising a memory and a processor, wherein the processor can call and run a computer program from the memory to execute the method described in the first aspect.

[0010] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a communication device to execute the method described in the first aspect.

[0011] In a seventh aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device to perform the method described in aspect 1. In some implementations, the computer program product may be a software installation package.

[0012] The embodiment of the present application can predict the channel deterioration based on the first parameters of the LTM candidate cell and / or service cell, thereby performing the wireless link recovery operation earlier, helping to shorten the time that the terminal device is in a poor channel connection scenario, and helping to quickly recover the wireless link. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of a wireless communication system used in an embodiment of the present application.

[0014] FIG2 is a schematic diagram of a wireless link detection process.

[0015] FIG3 is a schematic diagram of a cell handover process.

[0016] FIG4 is a schematic diagram of a cell handover process based on LIM.

[0017] FIG5 is a flow chart of a wireless link recovery method provided in an embodiment of the present application.

[0018] FIG6 is an example diagram of an embodiment of the present application that satisfies the first condition.

[0019] FIG7 is an example diagram of an embodiment of the present application in which the first condition is not satisfied.

[0020] FIG8 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.

[0021] FIG9 is a schematic structural diagram of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solution in this application will be described below with reference to the accompanying drawings.

[0023] Figure 1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0024] FIG1 exemplarily shows a network device and two terminals. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0025] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0026] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0027] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0028] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmission point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. A base station can also refer to a communication module, modem or chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0029] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0030] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0031] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0032] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0033] With the increasing demand for speed, latency, high-speed mobility, and energy efficiency, coupled with the increasing diversity and complexity of future services, the 3rd Generation Partnership Project (3GPP), an international standards organization, has begun developing 5G. Key 5G application scenarios include enhanced mobile broadband (eMBB), ultra reliable low latency communications (URLLC), and massive machine-type communications (mMTC).

[0034] For ease of understanding, the communication process involved in the embodiments of the present application is introduced below.

[0035] RLF

[0036] To ensure communication quality, terminal devices in the radio resource control (RRC) connected state (RRC_CONNECTED) will continuously monitor the downlink radio link quality of the serving cell during mobility. Network equipment can determine the synchronization and desynchronization status of the channel based on the signal quality of the synchronization signal block (synchronization signal / PBCH block, SSB) or the channel state information-reference signal (channel state information-reference signal, CSI-RS), such as the signal interference noise ratio (SINR).

[0037] Figure 2 is a schematic diagram of the radio link detection process. Referring to Figure 2, during the radio problem detection phase, when the block error rate (BLER) of N310 (a fixed value, configured by the network) physical downlink control channels (PDCCHs) is continuously detected to be greater than 10%, a desynchronization is considered to have occurred, and the T310 timer is started. Before the T310 timer expires, if the BLER of N311 (a fixed value, configured by the network) PDCCHs is continuously detected to be less than 2%, the signal is considered to have resynchronized, the T310 timer is stopped (not shown in Figure 2), and the terminal device's radio link is restored. Otherwise, the T310 timer expires, indicating a radio link failure (as shown in Figure 2), triggering the connection reestablishment process.

[0038] In wireless communication systems, a terminal device can move from one cell (also known as a "source cell") to another cell (also known as a "target cell"), which is called cell handover. The following describes the conditional handover mechanism in cell handover.

[0039] Conditional Switching

[0040] For the conditional switching mechanism, the network device can send conditional switching configuration information to the terminal device to configure the configuration information associated with at least one conditional switching candidate cell to the terminal device. Accordingly, after receiving the conditional switching configuration information, the terminal device starts to execute the conditional switching evaluation process (that is, starts to execute the switching condition evaluation task related to the conditional switching) to evaluate whether the switching condition associated with the above-mentioned at least one conditional switching candidate cell is met. When the switching condition associated with the above-mentioned at least one conditional switching candidate cell is met, the terminal device can select a conditional switching candidate cell that meets the switching condition to initiate the switching process, and switch from the source cell (or "current serving cell") to the selected conditional switching candidate cell that meets the switching condition (the selected conditional switching candidate cell that meets the switching condition can also be called a "target cell").

[0041] In conditional handover, the serving cell determines one or more candidate cells for conditional handover based on measurement reports (reported when RSRP is below a preset threshold). After sending a handover request to the candidate cell and obtaining the candidate cell configuration information, the serving cell sends a conditional handover command to the terminal device. The terminal device determines whether the conditional handover triggering conditions (contained in the conditional handover command) are met based on the measurement results of the candidate cell. If a candidate cell is found to meet the handover conditions, the subsequent random access process is performed on the cell.

[0042] Figure 3 is a schematic diagram of a cell handover process. The method shown in Figure 3 includes steps S302 to S320.

[0043] In step S302, the terminal device reports a measurement report to the serving cell.

[0044] In step S304, the serving cell makes a handover decision based on the measurement report.

[0045] In step S306, the serving cell initiates a handover request to the candidate cell.

[0046] In step S308, the candidate cell accepts the handover and establishes the RRC configuration.

[0047] In step S310, the candidate cell sends a handover confirmation message to the serving cell.

[0048] The handover confirmation information may include the above-mentioned RRC configuration.

[0049] In step S312, the serving cell sends a conditional switching command to the terminal device.

[0050] In step S314, the terminal device triggers condition switching.

[0051] Before the terminal device triggers the conditional switching, it is necessary to measure the relevant parameters. If the measurement results meet the switching conditions, the terminal device triggers the conditional switching.

[0052] In step S316, the terminal device performs synchronization and random access with the candidate cell.

[0053] In step S318, the terminal device sends a switching confirmation message to the candidate cell.

[0054] In step S320, the candidate cell sends a handover completion message to the terminal device.

[0055] In some embodiments, the switching condition in the cell switching may include an A3 event, ie, target cell RSRP> serving cell RSPR+hysteresis.

[0056] When multiple candidate cells are configured for conditional handover, the terminal device can attempt to connect to one of them. However, if access fails due to channel degradation, load balancing, or other reasons, the terminal device can reselect a candidate cell and attempt to connect. If this fails again, the conditional handover process fails, and the terminal device must reestablish the connection.

[0057] In related technologies, handover mechanisms are triggered by L3 measurements and implemented through RRC signaling. L3-based handover requires reconfiguration of the RRC or Packet Data Convergence Protocol (PDCP) layer and resetting the Media Access Control (MAC) layer and / or the physical layer.

[0058] Release 18 introduced LTM, which uses L1 / L2 signaling to change the serving cell of a terminal device while maintaining the higher-layer configuration unchanged. This reduces latency, overhead, and interruption time. The following describes the LTM cell handover process.

[0059] LTM

[0060] Figure 4 is a schematic diagram of a LIM-based cell handover process. The handover process shown in Figure 4 involves a terminal device and a network device, such as a gNB. Process 400 may include steps S410 to S480. Before performing a cell handover, the terminal device shown in Figure 4 is in the RRC_CONNECTED state.

[0061] In step S410, the terminal device reports a measurement report to the network device.

[0062] In step S410a, the network device performs LTM candidate cell preparation.

[0063] In step S420, the network device sends RRC configuration information to the terminal device, wherein the RRC configuration information includes LTM candidate configuration.

[0064] In step S430, the terminal device sends RRC configuration completion information to the network device.

[0065] In step S440, the terminal device is synchronized with the candidate cell, wherein the synchronization between the terminal device and the candidate cell includes uplink synchronization and downlink synchronization.

[0066] In step S450, the terminal device reports an L1 measurement report to the network device.

[0067] In step S460a, the network device performs an LTM decision, which may be based on the measurement result in the L1 measurement report obtained in step S450.

[0068] In step S460, the network device sends a cell handover command to the terminal device, wherein the handover command may be sent via MAC CE.

[0069] In step S460b, the terminal device leaves the serving cell and attempts to access the target LTM cell.

[0070] In step S470, the terminal device performs a random access process with the target cell.

[0071] In step S480, the LTM is completed.

[0072] In the above switching process, steps S410 to S430 are the LTM preparation process, step S440 is the preliminary synchronization process, steps S450 to S470 are the LTM execution process, and step S480 is the LTM completion process.

[0073] As shown in Figure 4, during the LTM execution phase, the terminal device periodically reports L1 measurement results. The network device can make LTM decisions based on the measurement results and issue a cell switch command in the form of a MAC CE. The terminal device leaves the serving cell and attempts to access the target LTM cell.

[0074] In the above LTM decision, the terminal device will retain the LTM candidate cell configuration information after completing the handover to facilitate subsequent handovers.

[0075] In the LTM case, since cell switching is based on L1 reference signal receiving power (RSRP) and lacks L3 filtering, it is more likely to switch to a cell with poor channel conditions, resulting in more RLF or handover failures.

[0076] In the event of LTM failure, the wireless link needs to be restored. The LTM failure recovery methods proposed in the related art are all used after the RLF or HOF declaration occurs. For example, if the network is configured with LTM candidate cells, the terminal device can first try LTM switching after RLF to avoid the cell reselection and re-establishment process. For another example, after RLF, if the cell selected for cell reselection is in the LTM candidate cell, a similar conditional switching method can be used to achieve rapid recovery of its channel. For another example, in the case of HOF, the existing T304 timer can be reused or a timer similar to T304 can be used to declare the connection re-establishment.

[0077] As a terminal device moves, sudden channel deterioration is unavoidable due to obstacles and other factors. The current RLF mechanism requires rapid channel recovery, such as triggering a connection reestablishment, only after the T310 timer expires (i.e., after an RLF is declared). The T310 timer typically lasts 1 second, meaning the terminal device will experience poor channel conditions for at least 1 second, significantly impacting the user experience.

[0078] Therefore, when the channel deteriorates, how to achieve rapid recovery of the wireless link is an urgent problem to be solved.

[0079] The reason the LTM failure recovery method described above triggers connection reestablishment after an RLF or HOF declaration occurs is because the terminal device only has the configuration information for the current serving cell and lacks the configuration information for other cells (neighboring cells). Only after an RLF or HOF declaration does the terminal device begin searching for and acquiring neighboring cell configuration information.

[0080] As mentioned above, in LTM, the terminal device has retained the configuration information of the LTM candidate cells. Therefore, the embodiment of the present application can predict the channel deterioration based on the information of the LTM candidate cells, thereby solving the above problem.

[0081] Figure 5 is a flow chart of a method for wireless link recovery according to an embodiment of the present application. The method shown in Figure 5 may include step S510 and step S520.

[0082] In step S510, the terminal device obtains a first parameter of the serving cell and / or the LTM candidate cell, where the first parameter is used to characterize the channel quality of the serving cell and / or the LTM candidate cell.

[0083] In other words, in S510, the terminal device obtains a first parameter of the serving cell and / or a first parameter of the LTM candidate cell. The first parameter of the serving cell is used to characterize the channel quality or communication quality of the serving cell, and the first parameter of the LTM candidate cell is used to characterize the channel quality or communication quality of the LTM cell.

[0084] In step S520, the terminal device determines whether to perform a radio link recovery operation based on the first parameters of the serving cell and / or the LTM candidate cell.

[0085] The first parameter may be SINR and / or RSRP.

[0086] Acquisition of the first parameter may, for example, involve measuring the first parameter, such as measuring the first parameter through a physical layer.

[0087] The aforementioned LTM candidate cells may be the candidate cells configured in the LTM decision process mentioned above.

[0088] Based on the first parameter of the LTM candidate cell and / or serving cell, the terminal device can quickly or early detect channel deterioration, or predict channel deterioration. Based on the prediction result, radio link recovery can be performed as early as possible when the channel is about to deteriorate or has deteriorated, thereby helping to shorten the time the terminal device is in a poor channel connection scenario, thereby helping to improve user service quality.

[0089] Whether to perform the radio link recovery operation can be based on whether channel deterioration is about to occur or has occurred, or whether RLF or HOF is about to occur. The change in the first parameter can characterize the channel situation. Therefore, whether to perform the radio link recovery operation can be determined by the relationship between the first parameter and the first condition. For example, when the first parameters of the serving cell and / or the LTM candidate cell meet the first condition, the radio link recovery operation can be performed, or the terminal device performs the radio link recovery operation. For another example, if the first parameters of the serving cell and the LTM candidate cell do not meet the first condition, the terminal device does not perform the radio link recovery operation.

[0090] The above-mentioned first condition can be associated with one or more of the following, for example: the size relationship between the first parameter of the serving cell and the threshold; the size relationship between the first parameter of the LTM candidate cell and the threshold; and the size relationship between the first parameter of the serving cell and the first parameter of the LTM candidate cell.

[0091] Generally, when the channel quality of the serving cell is poor, the probability of a radio link failure is higher. Therefore, the first condition can be associated with the relationship between the first parameter of the serving cell and the threshold. For example, the first condition can be that the first parameter of the serving cell is less than or equal to the second threshold.

[0092] In some cases, to improve decision accuracy, it's also necessary to consider the channel conditions of neighboring cells. Therefore, the first condition can be associated with the relationship between the first parameter of the LTM candidate cell and a threshold. For example, the first parameter of the LTM candidate cell must be greater than or equal to the first threshold.

[0093] When the channel quality of the serving cell differs significantly from that of the neighboring cell, a radio link failure may occur, or a handover to a neighboring cell with better communication quality may be required. Therefore, the first condition may be associated with the magnitude relationship between the first parameter of the serving cell and the first parameter of the LTM candidate cell.

[0094] For example, the first condition may be that the first parameter of the LTM candidate cell is greater than or equal to the sum of the first parameter of the serving cell and the first offset.

[0095] If the first parameter is RSRP, the value of the first offset may be, for example, greater than the hysteresis in the cell handover event A3 described above. In this way, the measurement report during the handover process can determine whether the first condition is met.

[0096] For another example, the first condition may be that the first parameter of the serving cell is less than or equal to a third threshold, and the first parameter of the LTM candidate cell is greater than or equal to a fourth threshold.

[0097] It should be noted that the above-mentioned offset and threshold value can be configured by the network device, and this application does not limit this.

[0098] In order to improve the reliability of the radio link recovery method, it is possible to perform multiple judgments on whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition.

[0099] In some embodiments, whether the first parameters of the serving cell and / or the LTM candidate cell meet the first condition may include: within the first time period, the first parameters of the serving cell and / or the LTM candidate cell corresponding to different judgment time points all meet the first condition. For example, the first time period includes N judgment time points, and if the first parameters of the serving cell and / or the LTM candidate cell at the N judgment time points all meet the first condition, then the first parameters of the serving cell and / or the LTM candidate cell are considered to meet the first condition; if the first parameters of the serving cell and / or the LTM candidate cell at only some of the N judgment time points meet the first condition, then the first parameters of the serving cell and / or the LTM candidate cell are considered to not meet the first condition.

[0100] In some embodiments, whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition may include: within a first time period, the number of times the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is greater than or equal to a fifth threshold. For example, if the first time period is 80 ms and the fifth threshold is 5 times, if within the first time period, the number of times the first parameter of the serving cell and / or the LTM candidate cell is detected to satisfy the first condition is 6 times, then the first parameter of the serving cell and / or the LTM candidate cell is considered to satisfy the first condition.

[0101] In some embodiments, whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition may include: within a first time period, a ratio at which the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is greater than or equal to a sixth threshold. The ratio at which the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition may refer to the number of times the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition divided by the number of detections and determinations of whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition.

[0102] For example, the first time period is 80ms, and the sixth threshold is 80%. If eight judgments are performed within the first time period on whether the first parameters of the serving cell and / or the LTM candidate cell meet the first condition, and seven of the judgments meet the first condition, then the ratio of the first parameters of the serving cell and / or the LTM candidate cell meeting the first condition is 87.5%, that is, it is considered that the first parameters of the serving cell and / or the LTM candidate cell meet the first condition.

[0103] In some embodiments, whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition may include: the number of times the first parameter of the serving cell and / or the LTM candidate cell continuously meets the first condition is greater than or equal to a seventh threshold.

[0104] For example, if the first parameters of the service cell and / or LTM candidate cell meet the first condition for 6 times, and the seventh threshold is 5 times, then in the 1st to 5th, or 2nd to 6th detection and judgment, the first parameters of the service cell and / or LTM candidate cell all meet the first condition, then it is considered that the first parameters of the service cell and / or LTM candidate cell all meet the first condition.

[0105] In some embodiments, determining whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition may include: the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition in multiple consecutive second time periods. For example, if the second time period is 30 ms, and in three consecutive second time periods, the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition in each 30 ms time period, then the first parameter of the serving cell and / or the LTM candidate cell is considered to satisfy the first condition.

[0106] In each of the above-mentioned multiple consecutive second time periods, one or more judgments can be made on whether the first parameters of the serving cell and / or LTM candidate cell meet the first condition, that is, each second time period can include one or more judgment time points.

[0107] If each of the plurality of consecutive second time periods includes multiple determination time points, then whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition may include: in each of the plurality of consecutive second time periods, the number of times the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is greater than or equal to an eighth threshold. For example, if the second time period is 30 ms and the eighth threshold is 2, if the number of times the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is 2 in each of three consecutive second time periods, then the first parameter of the serving cell and / or the LTM candidate cell is considered to satisfy the first condition.

[0108] In some embodiments, determining whether the first parameter of the serving cell and / or LTM candidate cell satisfies the first condition may include: in each second time period of a plurality of consecutive second time periods, a ratio of the first parameter of the serving cell and / or LTM candidate cell satisfying the first condition being greater than or equal to a ninth threshold. The ratio of satisfying the first condition herein may refer to the number of times the first parameter of the serving cell and / or LTM candidate cell satisfies the first condition divided by the number of times the first parameter of the serving cell and / or LTM candidate cell is tested to determine whether it satisfies the first condition in each second time period of the plurality of consecutive second time periods. For example, if the second time period is 30 ms and the ninth threshold is 50%, and if, in three consecutive second time periods, the first parameter of the serving cell and / or LTM candidate cell is tested three times in each second time period to determine whether it satisfies the first condition, and the first condition is satisfied twice in each second time period, i.e., the satisfaction ratio is 66.7%, then the first parameter of the serving cell and / or LTM candidate cell is deemed to satisfy the first condition.

[0109] In some embodiments, determining whether the first parameter of the serving cell and / or LTM candidate cell satisfies the first condition may include: before the first timer times out, the number of times the first parameter of the serving cell and / or LTM candidate cell satisfies the first condition is greater than or equal to a tenth threshold. For example, during the operation of the first timer, if the first parameter of the serving cell and / or LTM candidate cell satisfies the first condition, the first count value is incremented by 1, and the first timer is reset. A loop is continuously looped to determine whether the first condition is satisfied before the first timer times out. If the first count value is greater than or equal to the tenth threshold and the first timer has not timed out, it is considered that the first parameter of the serving cell and / or LTM candidate cell satisfies the first condition. If the first timer times out during the detection process (i.e., the first parameter of the serving cell and / or LTM candidate cell does not satisfy the first condition during this time period), it is considered that the first parameter of the serving cell and / or LTM candidate cell does not satisfy the first condition. At the same time, the first count value can be reset to zero, and the detection calculation can be restarted.

[0110] Whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition may include one or more of the above-mentioned multiple situations.

[0111] In some embodiments, the terminal device may determine whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition periodically or aperiodically. In other words, the determination timing of the first condition, such as the aforementioned determination time point, may be periodic or aperiodic.

[0112] The non-periodic time points may be, for example, randomly selected time points. For example, M time points are randomly selected within a first time period as the determination time points.

[0113] The judgment time point is a periodic time point, that is, the terminal device can judge whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition based on the judgment period, and the judgment time point can be determined based on the judgment period. As an example, if the first time period is 30ms and the judgment period is 10ms, the first time period can include 3 time judgment points, such as the 10th ms, the 20th ms, and the 30th ms in the first time period.

[0114] If the terminal device's judgment on whether the first parameter of the serving cell and / or LTM candidate cell meets the first condition is a periodic judgment, then the judgment periods corresponding to different first parameters may be the same or different. For example, if the first parameter includes SINR and RSRP, the judgment periods for SINR and RSRP may be the same to facilitate implementation. As an example, the judgment periods for SINR and RSRP may be configured to be 10ms, for example. For another example, if the first parameter includes SINR and RSRP, the judgment periods for SINR and RSRP may be different. As an example, the judgment period for SINR may be configured to be 10ms, and the judgment period for RSRP may be configured to be 20ms. In this way, different judgment periods for first parameters may be determined based on the characteristics of different first parameters, such as the changing characteristics of different first parameters, thereby helping to improve the flexibility of the judgment period configuration.

[0115] In addition, the timeout period of the timer can be set according to the use requirements. In some embodiments, the timeout period of the first timer can be set to the duration corresponding to the judgment period.

[0116] In some embodiments, the determination process of the first condition may be performed in a variety of ways.

[0117] For example, the physical layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition, and transmits the determination result to the MAC layer of the terminal device. The physical layer reports the determination result of whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition to the MAC layer, which helps to save transmission resources.

[0118] For another example, the physical layer of the terminal device transmits the first parameter of the serving cell and / or the LTM candidate cell to the MAC layer of the terminal device, and the MAC layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition. In this way, the MAC layer can obtain the measurement results of all the first parameters, making it easier to understand the changes in the first parameters.

[0119] For example, the physical layer of the terminal device determines whether the first parameter of the service cell and / or the LTM candidate cell meets the first condition. If so, the judgment result is transmitted to the MAC layer of the terminal device; if not, the judgment result may not be transmitted to the MAC layer of the terminal device, which helps to further save transmission resources.

[0120] Based on the above judgment result associated with the first parameter, it can be determined whether to perform a radio link recovery operation. The radio link recovery operation is described in detail below.

[0121] In some embodiments, the radio link recovery operation includes conditional LTM and / or connection re-establishment.

[0122] The connection re-establishment process typically includes cell search, downlink synchronization, system information acquisition, uplink synchronization, and resource allocation. The cell handover process typically includes downlink synchronization, uplink synchronization, and resource allocation. As can be seen, compared to the cell handover process, the connection re-establishment process has two additional steps: cell search and system information acquisition. Generally speaking, the time required for cell search and system information acquisition exceeds the time required for uplink / downlink synchronization and resource allocation.

[0123] Therefore, radio link recovery operations can include LTM handover. Before a radio link fails, the terminal device can use conditional LTM to switch to another cell, such as an LTM candidate cell. Compared to direct connection reestablishment, this helps reduce service interruption for the terminal device or speed up radio link recovery. The LTM candidate cell configuration information stored in the terminal device, as mentioned above, supports this solution.

[0124] The above-mentioned connection reestablishment may include RRC connection reestablishment and / or LTM connection reestablishment. LTM connection reestablishment may also refer to LTM-based connection reestablishment or LTM-associated connection reestablishment.

[0125] If the signal quality of the serving cell is poor, which may result in a failure to receive the cell handover command, you can directly perform a connection re-establishment to quickly restore the radio link. If the channel quality of all LTM candidate cells is poor, performing a cell handover may not effectively restore the radio link, or a cell handover failure may occur. In this case, performing a connection re-establishment directly can avoid invalid handovers in LTM candidate cells or multiple LTM handover failures, thereby helping to speed up radio link recovery.

[0126] In some embodiments, the connection re-establishment may be a connection re-establishment for RLF, or a connection re-establishment triggered by HOF.

[0127] In some embodiments, the radio link recovery operation is conditional LTM or connection re-establishment, which can be determined based on one or more of the following information: first indication information sent by the network device; and whether the LTM candidate cell is configured with conditional LTM.

[0128] If the first indication information indicates that the radio link recovery operation to be performed is conditional LTM, the terminal device performs conditional LTM; if the first indication information indicates that the radio link recovery operation to be performed is connection reestablishment, the terminal device performs connection reestablishment. The first indication information can be carried in RRC signaling, MAC CE, or DCI, for example.

[0129] If the LTM candidate cell is configured with conditional LTM, the cell can be used as a candidate cell for conditional LTM. In this case, the conditional LTM configuration is not empty, and the terminal device can execute conditional LTM to restore the radio link.

[0130] If a cell in the LTM candidate cell is not configured with conditional LTM, then the cell cannot be used as a candidate cell for conditional LTM. If no LTM candidate cell is configured with conditional LTM, that is, the conditional LTM configuration is empty, the terminal device can perform connection re-establishment to restore the radio link.

[0131] During the process of the terminal device executing the conditional LTM, if the second condition is met, the terminal device can perform connection re-establishment, which helps to quickly recover the wireless link.

[0132] In some embodiments, the second condition may be associated with one or more of: a second timer related to radio problem detection; and information related to the condition LTM failure.

[0133] The second condition may, for example, include a second timer expiration. The second timer associated with wireless problem detection may directly utilize the T310 timer mentioned above, or may be a newly defined timer for wireless problem detection. The second timer may be activated when a channel out-of-sync occurs, such as when the bit error rate exceeds a threshold.

[0134] As mentioned above, conditional LTM may fail or fail multiple times. Therefore, when the terminal device performs conditional LTM switching, the second condition for whether to perform connection re-establishment may be associated with relevant information of conditional LTM failure.

[0135] For example, the second condition may include that the number of failures of conditional LTM is greater than or equal to an eleventh threshold. The eleventh threshold may be an integer greater than or equal to 0. In some cases, if the configured eleventh threshold is 0, it may indicate that the terminal device does not support conditional LTM.

[0136] For another example, the conditional LTM performed on the target candidate cell fails, wherein the target candidate cell is the candidate cell configured with conditional LTM among the LTM candidate cells mentioned above.

[0137] It should be noted that if the second condition is met, the terminal device can reset the second timer while performing connection re-establishment.

[0138] The method provided in the embodiment of the present application can realize the rapid discovery of RLF / HOF, switch the terminal device to a cell with better channel conditions in advance or trigger connection re-establishment in advance, reduce the time of UE service deterioration / interruption, and improve the user service experience.

[0139] In some embodiments, the measurement of the first parameter may be performed periodically. Considering the complexity and measurement overhead of the first parameter measurement, and considering that the channel state is relatively stable when the second timer related to wireless problem detection is not started, in other embodiments, the measurement of the first parameter may be performed after the second timer is started, such as by performing periodic measurement.

[0140] In order to further reduce the measurement overhead and the energy consumption of the terminal device, the measurement of the first parameter may be relaxed. Various methods of relaxing the measurement of the first parameter are introduced below.

[0141] In some embodiments, the measurement period of the first parameter may be adjusted according to usage conditions to reduce measurement overhead.

[0142] For example, the measurement period of the first parameter is determined based on one or more of the following: whether the second timer related to wireless problem detection is turned on; the moving speed of the terminal device; the area where the terminal device is located; the pre-configuration information of the terminal device; and the second indication information sent by the network device.

[0143] As previously mentioned, the channel state is relatively stable when the second timer related to wireless problem detection is not started. Therefore, as an implementation method, the measurement period of the first parameter can be increased before the second timer is started. In other words, the measurement period used before the second timer is started is longer than the measurement period used after the second timer is started. For example, before the second timer is started, the measurement period can be 40 ms, and after the second timer is started, the measurement period can be 10 ms.

[0144] The rapid movement of a terminal device may cause rapid changes in the channel state. Correspondingly, when the terminal device moves slowly, the channel state is relatively stable. Therefore, as an implementation method, a smaller measurement period may be used when the terminal device moves quickly, and a larger measurement period may be used when the terminal device moves slowly. For example, when the terminal device moves quickly, the measurement period may be 10ms, and when the terminal device moves slowly, the measurement period may be 30ms.

[0145] If the terminal device is in an area where the first parameter is prone to change, a smaller measurement period may be used; if the terminal device is in an area where the first parameter is not easily changed, a larger measurement period may be used. Whether the first parameter in the area is prone to change may be determined based on the prediction result of the change in the first parameter. For example, the change in the first parameter may be predicted by artificial intelligence (AI) technology. As an example, when the AI ​​model predicts that the first parameter of the serving cell may deteriorate, or is in an area where the first parameter is prone to change, a smaller measurement period may be used; when the AI ​​model predicts that the first parameter of the serving cell has not deteriorated, or is in an area where the first parameter is not easily changed, a larger measurement period may be used.

[0146] The measurement period of the first parameter may be determined based on pre-configuration information of the terminal device, such as the configuration information of the terminal device may be used to configure the measurement period of the first parameter. For example, different cells may be configured with different measurement periods or the same measurement period. As an example, a cell with a large coverage area may be configured with a smaller measurement period, while a cell with a small coverage area may be configured with a larger measurement period.

[0147] The measurement period of the first parameter can be determined based on the second indication information sent by the network device, such as the second indication information can be used to indicate the measurement period of the first parameter. For example, when the network device detects that an increase in RLM events occurs in a certain area, such as a certain cell, the second indication information can be sent to indicate the use of a smaller measurement period. For another example, when the network device detects that the channel in a certain area is stable, no RLM events occur, or the RLM time that occurs is short, the second indication information can be sent to indicate the use of a larger measurement period.

[0148] In some other embodiments, the number of cells to be measured among the LTM candidate cells may be reduced, or in other words, at least part of the cells among the LTM candidate cells may be measured to reduce measurement overhead.

[0149] Among them, at least some LTM candidate cells can be determined based on one or more of the following: whether the timing advance of the LTM candidate cell is known; whether the LTM candidate cell is configured with non-competitive random access resources; statistical information of the LTM candidate cell as a re-established cell; cell re-establishment strategy information of the area where the terminal device is located; number limit information of the LTM candidate cell; LTM candidate cells indicated by the network device; and pre-configured LTM candidate cells that need to be measured.

[0150] For example, at least some of the LTM candidate cells may include cells whose timing advance is known among the LTM candidate cells. For another example, at least some of the LTM candidate cells may include cells configured with non-contention random access resources among the LTM candidate cells. For another example, at least some of the LTM candidate cells may include cells that have been re-established more frequently among the LTM candidate cells. For another example, at least some of the LTM candidate cells may include cells indicated by cell re-establishment strategy information in the area where the terminal device is located. The re-establishment strategy may be obtained based on AI technology, such as reinforcement learning technology. For another example, based on the number restriction information of the LTM candidate cells, the number of at least some of the LTM candidate cells may be determined. For another example, at least some of the LTM candidate cells may include LTM candidate cells indicated by the network device. For another example, at least some of the LTM candidate cells may include pre-configured LTM candidate cells that need to be measured.

[0151] At least some of the LTM candidate cells may include one or more of the above-mentioned types of cells. As an example, if the number of LTM candidate cells is limited to 5 cells, there is one LTM candidate cell with a known timing advance (recorded as the first cell), there are two LTM candidate cells with a high number of re-establishment times (recorded as the second cell and the third cell), there is one LTM candidate cell indicated by the network device (recorded as the fourth cell), and there is one LTM candidate cell configured with non-contention random access resources (recorded as the fifth cell), then at least some of the LTM candidate cells may include the first cell, the second cell, the third cell, the fourth cell, and the fifth cell.

[0152] Taking the tenth threshold of 3 as an example, Figures 6 and 7 are used to explain the aforementioned statement: "The first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition, including that, before the first timer expires, the number of times the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is greater than or equal to the tenth threshold." Figures 6 and 7 illustrate this from the perspective of the interaction between the physical layer and the MAC layer of the terminal device.

[0153] Figure 6 is an example diagram of an embodiment of the present application that satisfies the first condition. The process shown in Figure 6 includes steps S601 to S604.

[0154] In steps S601 to S603 , the physical layer reports to the MAC layer that the first condition is met.

[0155] In the above steps, the first condition is satisfied before the first timer times out. Therefore, the physical layer indicates to the MAC layer that the first condition is satisfied and resets the first timer. Each time the physical layer reports that the first condition is satisfied, the MAC layer increments the first count by 1. After step S603 is executed, the first count is 3.

[0156] In step S604, the MAC layer triggers a channel fast recovery operation.

[0157] Since the tenth threshold is 3, when the first count value is 3, the number of times the first condition is met is equal to the tenth threshold, that is, the first parameter of the serving cell and / or the LTM candidate cell meets the first condition. Therefore, the MAC layer can trigger a fast recovery operation of the channel.

[0158] Figure 7 is an example diagram of an embodiment of the present application in which the first condition is not met. The process shown in Figure 7 includes steps S701 to S703.

[0159] In steps S701 to S702 , the physical layer reports to the MAC layer that the first condition is met.

[0160] In the above steps, the first condition is satisfied before the first timer times out. Therefore, the physical layer indicates to the MAC layer that the first condition is satisfied and resets the first timer. Each time the physical layer reports that the first condition is satisfied, the MAC layer increments the first count by 1. After step S702 is executed, the first count is 2.

[0161] In step S703, the MAC layer sets the first counter to 0.

[0162] After step S702, before the first timer times out again, the first condition is not met, that is, the first count value does not meet the tenth threshold, that is, the first parameter of the serving cell and / or the LTM candidate cell does not meet the first condition. Therefore, when the first timer times out, the MAC layer can reset the first counter to zero.

[0163] It should be noted that the aforementioned periods, such as the smaller period and the larger period, etc., can be pre-configured or dynamically indicated based on actual conditions.

[0164] It should be noted that, when the first condition is that the RSRP of the LTM candidate cell is greater than or equal to the sum of the first parameter of the serving cell and the first offset, satisfying the first condition is different from a traditional handover event.

[0165] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 7 . The device embodiment of the present application is described in detail below in conjunction with Figures 8 to 9 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0166] FIG8 is a schematic block diagram of a terminal device according to an embodiment of the present application. The terminal device 800 may include an acquiring unit 810 and a determining unit 820 .

[0167] The acquiring unit 810 is configured to acquire a first parameter of a serving cell and / or an LTM candidate cell, wherein the first parameter is used to characterize the channel quality of the serving cell and / or the LTM candidate cell.

[0168] The determining unit 820 is configured to determine whether to perform a radio link recovery operation according to a first parameter of the serving cell and / or the LTM candidate cell.

[0169] In some embodiments, the first parameter includes SINR and / or RSRP.

[0170] In some embodiments, a radio link recovery operation is performed if a first parameter of the serving cell and / or the LTM candidate cell satisfies a first condition.

[0171] In some embodiments, the first condition is associated with one or more of the following: the size relationship between the first parameter of the serving cell and the threshold; the size relationship between the first parameter of the LTM candidate cell and the threshold; and the size relationship between the first parameter of the serving cell and the first parameter of the LTM candidate cell.

[0172] In some embodiments, the first condition includes one or more of the following: the first parameter of the LTM candidate cell is greater than or equal to the sum of the first parameter of the serving cell and a first offset; the first parameter of the LTM candidate cell is greater than or equal to a first threshold; the first parameter of the serving cell is less than or equal to a second threshold; and the first parameter of the serving cell is less than or equal to a third threshold, and the first parameter of the LTM candidate cell is greater than or equal to a fourth threshold.

[0173] In some embodiments, the first parameters of the serving cell and / or the LTM candidate cell satisfy a first condition, including at least one of the following: within a first time period, the first parameters of the serving cell and / or the LTM candidate cell corresponding to different judgment time points all satisfy the first condition; within the first time period, the number of times the first parameters of the serving cell and / or the LTM candidate cell satisfy the first condition is greater than or equal to a fifth threshold; within the first time period, the ratio of the first parameters of the serving cell and / or the LTM candidate cell satisfying the first condition is greater than or equal to a sixth threshold; the number of times the first parameters of the serving cell and / or the LTM candidate cell continuously satisfy the first condition is greater than or equal to a sixth threshold. the seventh threshold; in a plurality of consecutive second time periods, the first parameters of the serving cell and / or the LTM candidate cell all satisfy the first condition; in each second time period in the plurality of consecutive second time periods, the number of times the first parameters of the serving cell and / or the LTM candidate cell satisfy the first condition is greater than or equal to the eighth threshold; in each second time period in the plurality of consecutive second time periods, the ratio of the first parameters of the serving cell and / or the LTM candidate cell satisfying the first condition is greater than or equal to the ninth threshold; and, before the first timer expires, the number of times the first parameters of the serving cell and / or the LTM candidate cell satisfy the first condition is greater than or equal to the tenth threshold.

[0174] In some embodiments, the terminal device's judgment on whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is a periodic judgment or a non-periodic judgment.

[0175] In some embodiments, if the terminal device performs a periodic judgment on whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition, the judgment periods corresponding to different first parameters may be the same or different.

[0176] In some embodiments, the device further includes an execution unit, which is used to perform one of the following: the physical layer of the terminal device determines whether the first parameters of the service cell and / or the LTM candidate cell meet the first condition, and transmits the judgment result to the MAC layer of the terminal device; the physical layer of the terminal device transmits the first parameters of the service cell and / or the LTM candidate cell to the MAC layer of the terminal device, and the MAC layer of the terminal device determines whether the first parameters of the service cell and / or the LTM candidate cell meet the first condition; the physical layer of the terminal device determines whether the first parameters of the service cell and / or the LTM candidate cell meet the first condition, and if so, transmits the judgment result to the MAC layer of the terminal device.

[0177] In some embodiments, the radio link recovery operation includes conditional LTM and / or connection re-establishment.

[0178] In some embodiments, the radio link recovery operation is conditional LTM or connection re-establishment, which is determined based on one or more of the following information: first indication information sent by the network device; and whether the LTM candidate cell is configured with conditional LTM.

[0179] In some embodiments, the first indication information is carried in RRC signaling, MAC CE or DCI.

[0180] In some embodiments, the terminal device further comprises: an execution unit configured to execute connection re-establishment if a second condition is satisfied during the process of the terminal device executing the conditional LTM.

[0181] In some embodiments, the second condition is associated with one or more of: a first timer related to radio problem detection; and information related to a conditional LTM failure.

[0182] In some embodiments, the second condition includes one or more of the following: the first timer times out; the number of conditional LTM failures is greater than or equal to the eleventh threshold; the conditional LTM performed on the target candidate cell fails, wherein the target candidate cell is a candidate cell configured with conditional LTM among the LTM candidate cells.

[0183] In some embodiments, the measurement of the first parameter is performed periodically, or the measurement of the first parameter is performed after a first timer related to wireless problem detection is started.

[0184] In some embodiments, the measurement period of the first parameter is determined based on one or more of the following: whether a first timer related to wireless problem detection is turned on; the moving speed of the terminal device; the area where the terminal device is located; the pre-configuration information of the terminal device; and the second indication information sent by the network device; wherein the pre-configuration information is used to configure the measurement period of the first parameter, and the second indication information is used to indicate the measurement period of the first parameter.

[0185] In some embodiments, the LTM candidate cells are at least part of the LTM candidate cells of the terminal device, and the number of the at least part of the LTM candidate cells is determined based on one or more of the following: whether the timing advance of the LTM candidate cells is known; whether the LTM candidate cells are configured with non-competitive random access resources; statistical information of the LTM candidate cells as re-established cells; cell re-establishment strategy information of the area where the terminal device is located; number limit information of LTM candidate cells; LTM candidate cells indicated by the network device; and pre-configured LTM candidate cells that need to be measured.

[0186] Figure 9 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 9 indicate that the unit or module is optional. The device 900 may be used to implement the method described in the above method embodiment. The device 900 may be a chip or a terminal device.

[0187] The device 900 may include one or more processors 910. The processor 910 may support the device 900 to implement the method described in the method embodiment above. The processor 910 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0188] The apparatus 900 may further include one or more memories 920. The memories 920 store programs that can be executed by the processor 910, causing the processor 910 to perform the methods described in the above method embodiments. The memories 920 may be independent of the processor 910 or integrated into the processor 910.

[0189] The apparatus 900 may further include a transceiver 930. The processor 910 may communicate with other devices or chips via the transceiver 930. For example, the processor 910 may transmit and receive data with other devices or chips via the transceiver 930.

[0190] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal device or network device in each embodiment of the present application.

[0191] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0192] The present application also provides a computer program that can be applied to a terminal device or network device provided in the present application, and enables a computer to execute the method performed by the terminal device or network device in each embodiment of the present application.

[0193] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0194] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0195] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0196] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0197] In 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 indication, configuration and configuration, etc.

[0198] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0199] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0200] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0201] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0202] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0203] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0204] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0205] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0206] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless link recovery method, characterized in that: include: The terminal device obtains a first parameter of a serving cell and / or an LTM candidate cell, where the first parameter is used to characterize a channel quality of the serving cell and / or the LTM candidate cell; The terminal device determines whether to perform a radio link recovery operation based on a first parameter of the serving cell and / or the LTM candidate cell.

2. The method according to claim 1, characterized in that The first parameter includes SINR and / or RSRP.

3. The method according to claim 1 or 2, characterized in that: In a case where a first parameter of the serving cell and / or the LTM candidate cell satisfies a first condition, a radio link recovery operation is performed.

4. The method according to claim 3, characterized in that The first condition is associated with one or more of the following: The relationship between the first parameter of the serving cell and the threshold; The relationship between the first parameter of the LTM candidate cell and the threshold; and The magnitude relationship between the first parameter of the serving cell and the first parameter of the LTM candidate cell.

5. The method according to claim 4, characterized in that The first condition includes one or more of the following: The first parameter of the LTM candidate cell is greater than or equal to the sum of the first parameter of the serving cell and a first offset; A first parameter of the LTM candidate cell is greater than or equal to a first threshold; The first parameter of the serving cell is less than or equal to a second threshold; as well as The first parameter of the serving cell is less than or equal to a third threshold, and the first parameter of the LTM candidate cell is greater than or equal to a fourth threshold.

6. The method according to any one of claims 3 to 5, characterized in that: The first parameter of the serving cell and / or the LTM candidate cell satisfies a first condition, including at least one of the following: In the first time period, the first parameters of the serving cell and / or the LTM candidate cell corresponding to different judgment time points all meet the first condition; In the first time period, the number of times that the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is greater than or equal to a fifth threshold; In the first time period, a ratio of the first parameter of the serving cell and / or the LTM candidate cell satisfying the first condition is greater than or equal to a sixth threshold; The number of times that the first parameter of the serving cell and / or the LTM candidate cell continuously satisfies the first condition is greater than or equal to a seventh threshold; In a plurality of consecutive second time periods, the first parameters of the serving cell and / or the LTM candidate cell all satisfy the first condition; In each second time period of the plurality of consecutive second time periods, the number of times that the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is greater than or equal to an eighth threshold; In each second time period of the plurality of consecutive second time periods, a ratio of the first parameter of the serving cell and / or the LTM candidate cell satisfying the first condition is greater than or equal to a ninth threshold; as well as, Before the first timer times out, the number of times that the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is greater than or equal to a tenth threshold.

7. The method according to claim 6, characterized in that The terminal device's judgment on whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is a periodic judgment or a non-periodic judgment.

8. The method according to claim 7, characterized in that If the terminal device makes a periodic judgment on whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition, the judgment periods corresponding to different first parameters may be the same or different.

9. The method according to any one of claims 6 to 8, characterized in that The method further comprises: The physical layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition, and transmits the determination result to the MAC layer of the terminal device; or, The physical layer of the terminal device transmits the first parameter of the serving cell and / or the LTM candidate cell to the MAC layer of the terminal device, and the MAC layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition; or, The physical layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition, and if so, transmits the determination result to the MAC layer of the terminal device.

10. The method according to any one of claims 1 to 9, characterized in that The radio link recovery operation includes conditional LTM and / or connection re-establishment.

11. The method according to claim 10, characterized in that The radio link recovery operation is determined based on one or more of the following information: First indication information sent by the network device; and Whether the LTM candidate cell is configured with conditional LTM.

12. The method according to claim 11, characterized in that The first indication information is carried in RRC signaling, MAC CE or DCI.

13. The method according to any one of claims 10 to 12, characterized in that The method further comprises: During the process of the terminal device executing the conditional LTM, if the second condition is met, the terminal device executes connection re-establishment.

14. The method according to claim 13, characterized in that The second condition is associated with one or more of the following: a second timer associated with wireless problem detection; and Information about conditional LTM failures.

15. The method according to claim 14, characterized in that The second condition includes one or more of the following: The second timer times out; The number of failures of the conditional LTM is greater than or equal to the eleventh threshold; The conditional LTM performed on the target candidate cell all fails, wherein the target candidate cell is a candidate cell configured with conditional LTM among the LTM candidate cells.

16. The method according to any one of claims 1 to 15, characterized in that The measurement of the first parameter is performed periodically, or the measurement of the first parameter is performed after a second timer related to wireless problem detection is started.

17. The method according to any one of claims 1 to 16, characterized in that The measurement period of the first parameter is determined based on one or more of the following: Whether a second timer related to wireless problem detection is turned on; The moving speed of the terminal device; The area where the terminal device is located; Pre-configuration information of the terminal device; as well as The second indication information sent by the network device; The pre-configuration information is used to configure a measurement period of the first parameter, and the second indication information is used to indicate a measurement period of the first parameter.

18. The method according to any one of claims 1 to 17, characterized in that The LTM candidate cells are at least some of the LTM candidate cells of the terminal device, and the at least some of the LTM candidate cells are determined based on one or more of the following: Whether the timing advance of the LTM candidate cell is known; Whether the LTM candidate cell is configured with non-contention random access resources; LTM candidate cells are used as statistical information of re-established cells; Cell re-establishment strategy information of the area where the terminal device is located; Information on the number of LTM candidate cells that are limited; LTM candidate cells indicated by the network device; and Pre-configured LTM candidate cells that need to be measured.

19. A terminal device, characterized in that: include: An acquiring unit, configured to acquire a first parameter of a serving cell and / or an LTM candidate cell, wherein the first parameter is used to characterize a channel quality of the serving cell and / or the LTM candidate cell; A determination unit is used to determine whether to perform a radio link recovery operation according to a first parameter of the serving cell and / or the LTM candidate cell.

20. The device according to claim 19, characterized in that The first parameter includes SINR and / or RSRP.

21. The device according to claim 19 or 20, characterized in that In a case where a first parameter of the serving cell and / or the LTM candidate cell satisfies a first condition, a radio link recovery operation is performed.

22. The device according to claim 21, characterized in that The first condition is associated with one or more of the following: The relationship between the first parameter of the serving cell and the threshold; The relationship between the first parameter of the LTM candidate cell and the threshold; and The magnitude relationship between the first parameter of the serving cell and the first parameter of the LTM candidate cell.

23. The device according to claim 22, characterized in that The first condition includes one or more of the following: The first parameter of the LTM candidate cell is greater than or equal to the sum of the first parameter of the serving cell and a first offset; A first parameter of the LTM candidate cell is greater than or equal to a first threshold; The first parameter of the serving cell is less than or equal to a second threshold; as well as The first parameter of the serving cell is less than or equal to a third threshold, and the first parameter of the LTM candidate cell is greater than or equal to a fourth threshold.

24. The method according to any one of claims 21 to 23, characterized in that The first parameter of the serving cell and / or the LTM candidate cell satisfies a first condition, including at least one of the following: In the first time period, the first parameters of the serving cell and / or the LTM candidate cell corresponding to different judgment time points all meet the first condition; In the first time period, the number of times that the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is greater than or equal to a fifth threshold; In the first time period, a ratio of the first parameter of the serving cell and / or the LTM candidate cell satisfying the first condition is greater than or equal to a sixth threshold; The number of times that the first parameter of the serving cell and / or the LTM candidate cell continuously satisfies the first condition is greater than or equal to a seventh threshold; In a plurality of consecutive second time periods, the first parameters of the serving cell and / or the LTM candidate cell all satisfy the first condition; In each second time period of the plurality of consecutive second time periods, the number of times that the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition is greater than or equal to an eighth threshold; In each second time period of the plurality of consecutive second time periods, a ratio of the first parameter of the serving cell and / or the LTM candidate cell satisfying the first condition is greater than or equal to a ninth threshold; as well as, Before the first timer times out, the number of times that the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is greater than or equal to a tenth threshold.

25. The device according to claim 24, characterized in that The terminal device's judgment on whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition is a periodic judgment or a non-periodic judgment.

26. The device according to claim 25, characterized in that If the terminal device makes a periodic judgment on whether the first parameter of the serving cell and / or the LTM candidate cell satisfies the first condition, the judgment periods corresponding to different first parameters may be the same or different.

27. The device according to any one of claims 24 to 26, characterized in that The device further includes an execution unit, which is configured to execute one of the following: The physical layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition, and transmits the determination result to the MAC layer of the terminal device; The physical layer of the terminal device transmits the first parameter of the serving cell and / or the LTM candidate cell to the MAC layer of the terminal device, and the MAC layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition; The physical layer of the terminal device determines whether the first parameter of the serving cell and / or the LTM candidate cell meets the first condition, and if so, transmits the determination result to the MAC layer of the terminal device.

28. The apparatus according to any one of claims 19 to 27, characterized in that The radio link recovery operation includes conditional LTM and / or connection re-establishment.

29. The device according to claim 28, characterized in that The radio link recovery operation is a conditional LTM or a connection re-establishment, which is determined based on one or more of the following information: First indication information sent by the network device; and Whether the LTM candidate cell is configured with conditional LTM.

30. The device according to claim 29, characterized in that The first indication information is carried in RRC signaling, MAC CE or DCI.

31. Apparatus according to any one of claims 28 to 30, characterised in that The device also includes: The execution unit is used to execute connection re-establishment if the second condition is met during the process of the terminal device executing the conditional LTM.

32. The device according to claim 31, characterized in that The second condition is associated with one or more of the following: a second timer associated with wireless problem detection; and Information about conditional LTM failures.

33. The device according to claim 32, characterized in that The second condition includes one or more of the following: The second timer times out; The number of failures of the conditional LTM is greater than or equal to the eleventh threshold; The conditional LTM performed on the target candidate cell all fails, wherein the target candidate cell is a candidate cell configured with conditional LTM among the LTM candidate cells.

34. Apparatus according to any one of claims 19 to 33, characterised in that The measurement of the first parameter is performed periodically, or the measurement of the first parameter is performed after a second timer related to wireless problem detection is started.

35. Apparatus according to any one of claims 19 to 34, characterised in that The measurement period of the first parameter is determined based on one or more of the following: Whether a second timer related to wireless problem detection is turned on; The moving speed of the terminal device; The area where the terminal device is located; Pre-configuration information of the terminal device; as well as The second indication information sent by the network device; The pre-configuration information is used to configure a measurement period of the first parameter, and the second indication information is used to indicate a measurement period of the first parameter.

36. Apparatus according to any one of claims 19 to 35, characterised in that The LTM candidate cells are at least some of the LTM candidate cells of the terminal device, and the at least some of the LTM candidate cells are determined based on one or more of the following: Whether the timing advance of the LTM candidate cell is known; Whether the LTM candidate cell is configured with non-contention random access resources; LTM candidate cells are used as statistical information of re-established cells; Cell re-establishment strategy information of the area where the terminal device is located; Information on the number of LTM candidate cells that are limited; LTM candidate cells indicated by the network device; and Pre-configured LTM candidate cells that need to be measured.

37. A terminal device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the terminal device executes the method as claimed in any one of claims 1 to 18.

38. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 18.

39. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes the method according to any one of claims 1 to 18.

40. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 18.

41. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 18.

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