Method for wireless communication, terminal device, and network device

Abstract

Provided are a method for wireless communication, a terminal device, and a network device. The method for wireless communication comprises: if a first event is satisfied, a terminal device triggers a conditional handover before a handover condition associated with any candidate cell among one or more candidate cells is satisfied. The first event is related to conditional handover, or the first event is related to conditional handover and a radio link failure event predicted by the terminal device.

Description

Methods, terminal devices, and network devices for wireless communication Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a method, terminal device, and network device for wireless communication. Background Technology

[0002] Under the conditional handover (CHO) mechanism, the terminal device can evaluate whether the handover conditions associated with one or more candidate cells are met. If the handover conditions associated with at least one of the candidate cells are met, the terminal device will hand over to the candidate cell that meets the handover conditions. However, this approach has some problems. For example, during the process of evaluating whether one or more candidate cells meet their associated handover conditions, the terminal device may trigger a radio link failure event in the serving cell. Also, if the handover conditions configured by the network device are unreasonable, it may lead to the terminal device handing over too early or too late.

[0003] Summary of the Invention

[0004] This application provides a method, terminal device, and network device for wireless communication. The various aspects covered in this application are described below.

[0005] In a first aspect, a method for wireless communication is provided, comprising: if a first event is satisfied, a terminal device triggers a conditional handover before a handover condition associated with any one of one or more candidate cells is satisfied; wherein the first event is related to the conditional handover, or the first event is related to the conditional handover and a wireless link failure event predicted by the terminal device.

[0006] In a second aspect, a method for wireless communication is provided, comprising: a network device sending configuration information to a terminal device, the configuration information being related to a first event and / or the terminal device triggering a conditional handover before a handover condition associated with any one of one or more candidate cells is met, wherein the first event is related to the conditional handover, or the first event is related to the conditional handover and a wireless link failure event predicted by the terminal device.

[0007] Thirdly, a terminal device is provided, comprising: a handover module, configured to trigger conditional handover before a handover condition associated with any one of one or more candidate cells is met if a first event is satisfied; wherein the first event is related to conditional handover, or the first event is related to conditional handover and a radio link failure event predicted by the terminal device.

[0008] Fourthly, a network device is provided, comprising: a transmitting module, configured to transmit configuration information to a terminal device, the configuration information being related to a first event and / or the terminal device triggering a conditional handover before a handover condition associated with any one of one or more candidate cells is met, wherein the first event is related to the conditional handover, or the first event is related to the conditional handover and a radio link failure event predicted by the terminal device.

[0009] Fifthly, a terminal device is provided, including a processor and a memory, the memory being used to store one or more computer programs, and the processor being used to invoke the computer programs in the memory to cause the terminal device to perform some or all of the steps in the method of the first aspect.

[0010] In a sixth aspect, a network device is provided, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect.

[0011] Seventhly, embodiments of this application provide a communication system including the aforementioned terminal device and / or network device. In another possible design, the system may further include other devices that interact with the terminal device or network device as described in the embodiments of this application.

[0012] Eighthly, embodiments of this application provide a computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps in the methods described above.

[0013] Ninthly, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of the methods described in the foregoing aspects. In some implementations, the computer program product may be a software installation package.

[0014] In a tenth aspect, embodiments of this application provide a chip including a memory and a processor, the processor being able to call and run a computer program from the memory to implement some or all of the steps described in the methods of the foregoing aspects.

[0015] In this embodiment, when the first event is met, the terminal device can trigger conditional handover before the handover condition associated with any one of the candidate cells is met. Compared to the terminal device having to trigger conditional handover only after the handover condition associated with a certain candidate cell is met, this approach helps avoid scenarios where data interruption occurs due to a radio link failure event before the handover condition associated with any candidate cell is met. This is because the terminal device will perform conditional handover in advance based on a prediction process before the radio link failure event is triggered, thereby improving user throughput experience during conditional handover and increasing the utilization efficiency of network device resources related to conditional handover. Furthermore, flexible control over the timing of conditional handover execution increases the probability of successful handover and effectively reduces scenarios of handover occurring too early or too late. Attached Figure Description

[0016] Figure 1 is a system architecture example diagram of a wireless communication system applicable to embodiments of this application.

[0017] Figure 2 is a flowchart illustrating a method for wireless communication provided in an embodiment of this application.

[0018] Figure 3 is an example of the relationship between different moments on the time axis.

[0019] Figure 4 is a schematic diagram of the structure of the terminal device provided in the embodiment of this application.

[0020] Figure 5 is a schematic diagram of the structure of the network device provided in an embodiment of this application.

[0021] Figure 6 is a schematic structural diagram of the communication device provided in an embodiment of this application. Detailed Implementation

[0022] Communication system architecture

[0023] Figure 1 is a system architecture example diagram of a wireless communication system 100 to which embodiments of this application can be applied. 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 geographical area and may communicate with the terminal device 120 located within that coverage area.

[0024] Figure 1 illustrates an example of a network device and two terminal devices. 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. This application embodiment does not limit this.

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

[0026] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th generation mobile communication systems, satellite communication systems, and so on.

[0027] The terminal device in this application embodiment can 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 this application embodiment can be 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 connectivity, vehicle-mounted device, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes, etc. Optionally, the UE can act as a base station. For example, the UE can act as a scheduling entity, providing sidelink signals between UEs in V2X or D2D, etc. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0028] In some embodiments, the network device in this application can be a device for communicating with a terminal device. This network device can also be referred to as an access network device or a radio access network device, such as a base station. In this application, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. Base stations can broadly encompass various names like those listed below, or be interchangeable with them, such as: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), secondary station (SeNB), multi-mode 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), centralized unit-control plane (CU-CP), centralized unit-user plane (CU-UP), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, or equipment performing base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, network-side equipment in 6G networks, and equipment performing base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or equipment forms used in 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 depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

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

[0031] Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices 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 by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0033] In some embodiments, the network device mentioned in this application is a core network device (or, a network element in the core network). For example, a core network device may include one of the following: a location management function (LMF) network element, a network slice selection function (NSSF) network element, an authentication server function (AUSF) network element, a unified data management (UDM) network element, an access and mobility management function (AMF) network element, a session management function (SMF) network element, a policy control function (PCF) network element, a user plane function (UPF) network element, a sensing function (SF) network element, a network data analytics function (NWDAF) network element, and an AI function management entity.

[0034] In some embodiments, the network device mentioned in this application is an operations, administration, and maintenance (OAM) device.

[0035] To facilitate understanding, some related technical knowledge involved in the embodiments of this application is first introduced. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0036] Condition switching

[0037] To improve the robustness of the handover process, some communication systems (such as NR systems) have introduced a conditional handover mechanism, namely the Conditional Handover Occurrence (CHO) mechanism. Of course, if the CHO mechanism is applied to dual connectivity (DC) scenarios, it includes conditional primary / secondary cell addition (CPA), conditional primary / secondary cell change (CPC), and subsequent conditional primary / secondary cell addition / change (SCPAC). This application does not limit the specific scenario to which the CHO mechanism applies; it is applicable to both DC and non-DC scenarios. The handover process corresponding to the conditional handover mechanism is described below.

[0038] In some implementations, network devices can configure one or more candidate cells (or one or more conditional handover cells, or one or more conditional handover candidate cells) for terminal devices. The configuration of these candidate cells can include the cell configuration associated with each candidate cell and the handover conditions associated with each candidate cell. Typical handover conditions include the following events: the cell-level measurement result of a neighboring cell is higher than the cell-level measurement result of the serving cell by an offset; or, the cell-level measurement result of a neighboring cell is greater than an absolute threshold; or, the cell-level measurement result of a neighboring cell is greater than an absolute threshold and the cell-level measurement result of the serving cell is less than another absolute threshold. However, the terminal device does not trigger access to a candidate cell immediately upon the fulfillment of the handover conditions. Instead, it waits until the duration corresponding to the fulfilled state of the event equals the time-to-trigger (TTT) duration associated with the event before triggering access to the candidate cell.

[0039] After successfully receiving the configuration information for one or more candidate cells from the network device, the terminal device does not immediately perform cell handover. Instead, it first evaluates whether the handover conditions associated with each candidate cell are met. If the handover conditions associated with at least one of the candidate cells are met, the terminal device can trigger conditional handover, meaning it will leave the serving cell and attempt to access a candidate cell that meets the handover conditions. It should be noted that while evaluating the handover conditions associated with each candidate cell, the terminal device maintains communication with the serving cell and continues to assess radio link failure (RLF) events for the serving cell.

[0040] In some implementations, the terminal device triggers connection re-establishment during the conditional handover evaluation process or during the triggering of the conditional handover action. For example, after successfully receiving the relevant configurations of one or more candidate cells, the terminal device evaluates whether the handover conditions associated with each candidate cell are met. If an RLF (Relational Link Failure) occurs in the serving cell during the evaluation period, the terminal device triggers connection re-establishment. As another example, if the terminal device determines that the handover conditions associated with at least one candidate cell are met, the terminal device triggers conditional handover. However, if the terminal device fails to successfully access any of the configured candidate cells before the handover timer T304 expires, the terminal device triggers connection re-establishment.

[0041] In some implementations, if the network device allows the terminal device to reconsider candidate cells associated with conditional handover during the connection re-establishment process during configuration, then after triggering connection re-establishment, the terminal device can select a cell based on the cell selection process. If the cell selected by the terminal device is a cell included in the relevant configuration of one or more candidate cells stored by the terminal device, the terminal device applies the configuration of that cell and initiates a handover procedure for that cell. Otherwise, if the cell selected by the terminal device is not a cell included in the relevant configuration of one or more candidate cells stored by the terminal device, the terminal device can normally initiate a connection re-establishment procedure for that cell.

[0042] In some implementations, if the network device does not allow the terminal device to reconsider the candidate cell associated with conditional handover during the connection re-establishment process during the configuration process, then after the terminal device triggers the connection re-establishment, it can select a cell based on the cell selection process, and regardless of whether the cell belongs to the cell included in the relevant configuration of one or more candidate cells stored by the terminal device, the terminal device will normally initiate the connection re-establishment process in that cell.

[0043] Under the current conditional handover mechanism, the terminal device must wait until the handover conditions associated with the candidate cell are met before performing the handover action. For example, after the terminal device determines that the handover conditions associated with at least one of one or more candidate cells are met, the terminal device will handover to the candidate cell that meets the handover conditions. However, this approach has some problems. As an example, during the process of evaluating whether one or more candidate cells meet their respective associated handover conditions, the terminal device may experience a Recurrent Connection Failure (RLF) in the serving cell, causing the terminal device to trigger connection re-establishment. On the one hand, triggering connection re-establishment will cause a period of interruption in data transmission between the terminal device and the serving cell, reducing user throughput and experience. On the other hand, it may also cause the terminal device to discard the relevant configurations for conditional handover stored before they are used, wasting the network device's configuration resources. As another example, if the relevant configurations for conditional handover (such as handover conditions) configured by the network device are unreasonable, it may lead to scenarios where the terminal device hands over too early or too late.

[0044] To address the aforementioned issues, this application provides a method, terminal device, and network device for wireless communication. In this application embodiment, when a first event is met, the terminal device can trigger conditional handover before the handover conditions associated with any one of the candidate cells are met (or trigger conditional handover in advance when the handover conditions associated with all candidate cells are not met). This helps avoid scenarios where data interruption occurs due to a radio link failure event before the handover conditions associated with any candidate cell are met, because the terminal device will execute conditional handover in advance based on a prediction process before the radio link failure event is triggered. This improves user throughput experience during conditional handover and enhances the utilization efficiency of conditional handover-related resources configured in the network device. Furthermore, flexible control over the timing of conditional handover execution increases the probability of successful handover and effectively reduces scenarios of handover occurring too early or too late.

[0045] The method embodiments of this application will be described below.

[0046] Figure 2 is a flowchart illustrating a method for wireless communication provided in an embodiment of this application. The method shown in Figure 2 can be executed by a terminal device, such as the terminal device 120 shown in Figure 1. In some embodiments, the method shown in Figure 2 can be executed interactively by the terminal device and a network device. For example, if the configuration related to a first event and / or the configuration related to the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met is configured by the network device, the method shown in Figure 2 can be executed interactively by the terminal device and the network device. Alternatively, if the terminal device needs to indicate to the network device whether it supports the RLF event prediction function and / or whether it supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met, the method shown in Figure 2 can be executed interactively by the terminal device and the network device.

[0047] The method shown in Figure 2 includes step S210. In step S210, if the first event is satisfied, the terminal device triggers a conditional handover before the handover condition associated with any one of the candidate cells is satisfied. In other words, if the first event is satisfied, the terminal device triggers a conditional handover before the handover condition associated with any one of the candidate cells is satisfied, that is, the terminal device leaves the serving cell and attempts to access one of the candidate cells.

[0048] In some embodiments, the first event is associated with one or more of the following: conditional handover, and an RLF event predicted by the terminal device. As an example, the first event is related to conditional handover. As another example, the first event is related to both conditional handover and an RLF event predicted by the terminal device. These will be described below in conjunction with different scenarios.

[0049] Scenario 1: The first event is related to condition switching and the RLF event predicted by the terminal device.

[0050] In Scenario 1, the first event may be related to one or more of the following: the time when the RLF event predicted by the terminal device occurs, and information related to whether any candidate cell predicted by the terminal device meets the handover conditions associated with that candidate cell. Information related to whether any candidate cell predicted by the terminal device meets the handover conditions associated with that candidate cell may include, for example, whether at least one candidate cell among one or more candidate cells meets the corresponding handover conditions associated with it within a certain period of time, and the time when the handover conditions associated with at least one candidate cell among one or more candidate cells are met, etc.

[0051] In some embodiments, the first event may include: at a first moment, the terminal device predicts that it will trigger an RLF (Resignation Limitation Function) in the serving cell at a second moment after a first duration, and at the first moment, the terminal device predicts that the handover conditions associated with any candidate cell (e.g., each candidate cell) will not be met within the future first duration. That is, while evaluating whether the handover conditions associated with one or more candidate cells are met, if the terminal device predicts at the first moment that it will trigger an RLF in the serving cell at a second moment after a first duration and at the first moment predicts that no candidate cell's handover conditions will be met within the future first duration (i.e., at any moment between the first and second moments), the terminal device may trigger a conditional handover in advance (i.e., attempt to leave the serving cell and access one of the one or more candidate cells configured for the terminal device by the network device).

[0052] In the embodiments of this application, the first moment can be the current moment of the terminal device. Alternatively, the first moment can be any moment in the process of the terminal device evaluating whether the handover conditions associated with one or more candidate cells are met. That is, the terminal device can predict whether it will trigger RLF in the serving cell and / or predict whether the handover conditions associated with any candidate cell are met at any moment in the process of evaluating whether the handover conditions associated with one or more candidate cells are met.

[0053] In some embodiments, the first duration can be used to indicate the duration for which the terminal device predicts an RLF event. For example, the first duration can be used to indicate the maximum duration for which the terminal device predicts an RLF event, that is, the maximum temporal prediction duration for which the terminal device performs RLF event prediction based on AI technology. In other words, the first duration can be used to indicate the maximum time the terminal device can predict before an RLF event will occur.

[0054] In some embodiments, the first duration can be used to indicate the duration for the terminal device to predict whether the handover conditions associated with any candidate cell are met. For example, the first duration can be used to indicate the maximum duration for the terminal device to predict whether the handover conditions associated with any candidate cell are met, that is, the maximum temporal prediction duration for the terminal device to perform the prediction behavior based on AI technology to determine whether the handover conditions associated with any candidate cell are met. In other words, the first duration can be used to indicate the maximum time the terminal device can predict after which any candidate cell will meet the handover conditions associated with that candidate cell.

[0055] This application does not limit the method of indicating the first duration in its embodiments. As one implementation, the first duration may be indicated by the network device. As another implementation, the first duration may be predefined or preconfigured, such as by a protocol. The method of indicating the first duration will be described later and will not be detailed here.

[0056] In some embodiments, the second moment is determined based on the first moment and the first duration. For example, the second moment refers to the moment that is after the first moment and is separated from the first moment by the first duration. Taking the first duration as 1 second as an example, if the first moment is the moment corresponding to the 0th second, then the second moment is the moment corresponding to the 1st second; if the first moment is the moment corresponding to the 2nd second, then the second moment is the moment corresponding to the 3rd second.

[0057] In some embodiments, the second moment can be the moment when the terminal device predicts the RLF event will trigger. In other words, the terminal device predicts that it will trigger the RLF event in the serving cell at the second moment, or the terminal device predicts that the probability or confidence level of triggering the RLF event in the serving cell at the second moment is greater than a threshold, such as a threshold of 90%.

[0058] This application does not specifically limit the handover conditions associated with any candidate cell. For example, the handover conditions associated with any candidate cell may be related to one or more of the following: the cell-level measurement results of the candidate cell, the cell-level measurement results of the serving cell, and the duration requirement of the TTT timer.

[0059] As an example, the handover conditions associated with any candidate cell may include: the cell-level measurement result of the candidate cell is greater than a threshold, and the duration exceeds the duration requirement of the TTT timer corresponding to the event type.

[0060] As another example, the handover conditions associated with any candidate cell may include: the cell-level measurement result of the serving cell is less than a threshold, and the duration exceeds the duration requirement of the TTT timer corresponding to the event type.

[0061] As another example, the handover conditions associated with any candidate cell may include: the cell-level measurement result of the candidate cell is greater than a threshold and the cell-level measurement result of the serving cell is less than another threshold, and the duration of this state exceeds the duration requirement of the TTT timer corresponding to this event type.

[0062] In some embodiments, the handover conditions associated with any candidate cell may be the same; in other embodiments, the handover conditions associated with any candidate cell may be different. This application does not limit this.

[0063] For details on the handover conditions associated with any candidate cell, please refer to relevant technologies (such as the handover conditions specified in the protocol), which will not be repeated here.

[0064] It should be noted that the "one or more candidate cells" mentioned in the embodiments of this application refer to one or more candidate cells configured by the network device for the terminal device for conditional handover. Any candidate cell belongs to one or more candidate cells configured by the network device for the terminal device for conditional handover. Therefore, "one or more candidate cells" in the embodiments of this application can also be understood or replaced by terms such as "one or more conditional handover cells" or "one or more conditional handover candidate cells," and "any candidate cell" can also be understood or replaced by terms such as "any conditional handover cell" or "any conditional handover candidate cell." Unless otherwise specified, "one or more candidate cells" mentioned below refers to candidate cells used for conditional handover, and will not be repeated below.

[0065] In some embodiments, the first event may include: the terminal device predicts at a first time that the time interval between the third and fourth times is less than or equal to a second duration. That is, while evaluating whether the handover conditions associated with any candidate cell are met, if the terminal device predicts at the first time that the time interval between the third and fourth times is less than or equal to the second duration, the terminal device may trigger a conditional handover in advance (i.e., attempt to leave the serving cell and access one of the one or more candidate cells configured for the terminal device by the network device). Here, the third time is the earliest time when the terminal device predicts that the handover conditions associated with at least one candidate cell will be met. The fourth time is the time when the terminal device predicts that it will trigger an RLF (Real-Time Limit Forward) in the serving cell. In this way, when the time when the terminal device predicts the triggering of an RLF is close to the earliest time when the handover conditions associated with at least one candidate cell are met, the terminal device can trigger a conditional handover in advance to avoid prediction errors causing an RLF to occur before the handover conditions associated with any candidate cell are met.

[0066] In some embodiments, the terminal device predicts the event occurring at the third time point at a first time point, and predicts the event occurring at the fourth time point at a time point prior to the first time point. In this way, at the first time point, the terminal device can determine whether the time interval between the third and fourth times points is less than or equal to a second duration. In this case, the third and fourth times points may be different times; for example, the fourth time point may precede the third time point. The fourth time point may be the same as the second time point, i.e., the earliest time at which the terminal device predicts it will trigger an RLF (Reactive Frequency Forwarding) in the serving cell.

[0067] In some embodiments, the terminal device predicts the event occurring at the fourth time point at the first time point, and the terminal device predicts the event occurring at the third time point at a time point prior to the first time point. In this way, at the first time point, the terminal device can determine whether the time interval between the third and fourth time points is less than or equal to the second duration. In this case, the fourth time point may be after the third time point. The fourth time point may also be the same as the second time point, i.e., the earliest time at which the terminal device predicts it will trigger an RLF (Reactive Frequency Forwarding) in the serving cell.

[0068] In some embodiments, the second duration can be used to indicate the minimum time interval between the third and fourth times. That is, the second duration can be used to indicate the minimum time interval required between the time when the terminal device predicts the triggering of the RLF in the serving cell and the earliest time when the handover conditions associated with at least one candidate cell are met.

[0069] In some embodiments, regardless of whether the third time point is before or after the fourth time point, as long as the time interval between the third time point and the fourth time point is less than or equal to the second duration, the terminal device needs to trigger the condition switch in advance.

[0070] In some embodiments, if the third time point is after the fourth time point and the time interval between the third time point and the fourth time point is greater than the second duration, that is, before the handover conditions associated with any candidate cell in one or more candidate cells are met, the terminal device will trigger RLF in the serving cell. In this case, the terminal device can trigger condition handover in advance.

[0071] In some embodiments, if the third time point is before the fourth time point and the time interval between the third time point and the fourth time point is greater than the second duration, that is, when the handover condition associated with at least one candidate cell in one or more candidate cells is met, the terminal device has not yet triggered RLF in the serving cell, in this case, the terminal device can trigger condition handover normally (i.e., there is no need to trigger condition handover in advance).

[0072] For an introduction to the first moment, please refer to the above text, which will not be repeated here.

[0073] The first event of Scenario 1 has been introduced above. The following section will introduce the preset behavior executed by the terminal device when the first event is met in Scenario 1.

[0074] It should be noted that, under the condition that the first event is met, the terminal device can trigger the condition switching behavior at any time between the first moment and the second moment (or the fourth moment). This application embodiment does not limit the specific time at which the terminal device triggers the condition switching in advance; this will be described below with reference to Figure 3. Figure 3 shows the relationship between the various moments on the time axis; the relationships between the various moments mentioned below can be found in Figure 3.

[0075] In Scenario 1, if the first event is met, the preset behavior executed by the terminal device is related to conditional handover. For example, if the first event is met, the terminal device can trigger conditional handover before the handover conditions associated with any candidate cell are met. Triggering conditional handover before the handover conditions associated with any candidate cell are met can be understood or replaced as the terminal device attempting to leave the serving cell and access one of the candidate cells configured for the terminal device by the network device before the handover conditions associated with any candidate cell are met.

[0076] In Scenario 1, the terminal device can determine whether to trigger conditional handover in advance by combining the predicted handover condition assessment and the predicted RLF event. This has two advantages: First, if the terminal device predicts an RLF event during the handover assessment process, it can trigger the handover in advance, greatly reducing the probability of an actual RLF event and thus avoiding data interruption caused by an RLF, improving user throughput. Second, triggering the handover in advance prevents the discarding of stored handover configurations after an RLF event, thereby improving the utilization efficiency of candidate cell-related resources configured by the network device.

[0077] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: if a first condition is met, the terminal device initiates a handover procedure to the candidate cell that meets the first condition. Initiating a handover procedure to the candidate cell that meets the first condition improves the success rate of conditional handover and has higher reliability.

[0078] In some embodiments, the first condition described above is related to the measurement results of the candidate cell (such as cell-level measurement results).

[0079] As an example, the first condition may include: the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell, but the duration corresponding to the state where the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell up to the current time (the first time or a time after the first time) is less than a first duration threshold. In some embodiments, the aforementioned first duration threshold may be used to indicate the TTT duration requirement associated with the event type indicated in the handover condition associated with the candidate cell. Taking the case where the cell-level measurement result of the candidate cell is greater than a threshold as an example, the first condition may include that the cell-level measurement result corresponding to the candidate cell is greater than the threshold, but the duration for which the cell-level measurement result corresponding to the candidate cell is greater than the threshold up to the current time does not meet the TTT duration requirement.

[0080] As another example, the first condition could include: the cell-level measurement result corresponding to the candidate cell is greater than the second threshold.

[0081] In some embodiments, the second threshold is a measurement result judgment threshold. This application does not limit the configuration method of the second threshold. For example, the second threshold may be a measurement result judgment threshold configured by the network device. As another example, the second threshold may be a predefined or preconfigured measurement result judgment threshold.

[0082] In some embodiments, if there are multiple candidate cells that meet the first condition, the terminal device can arbitrarily select one of the multiple candidate cells that meet the first condition to initiate a handover procedure. However, the embodiments of this application are not limited to this. For example, if there are multiple candidate cells that meet the first condition, the terminal device can select the candidate cell with the best cell-level measurement result from the multiple candidate cells that meet the first condition to initiate a handover procedure, etc.

[0083] In some embodiments, at the exact moment the first condition is met, the terminal device may initiate a handover procedure to a candidate cell that meets the first condition. In some embodiments, after a period of time has elapsed since the first condition was met, the terminal device may initiate a handover procedure to a candidate cell that meets the first condition.

[0084] In some embodiments, the terminal device can determine whether the first condition is met at the exact moment the first event is satisfied; that is, the terminal device can determine whether the first condition is met at the first instant. In some embodiments, when the terminal device meets the first condition at the first instant, the terminal device can trigger a handover procedure to a candidate cell that meets the first condition at the first instant. The judgment logic for the terminal device to trigger conditional handover at the first instant is simple and easy to implement. Furthermore, additionally judging the first condition helps improve the success rate of conditional handover and increases reliability. In some embodiments, if the first condition is not met at the first instant, the terminal device can trigger a handover procedure to a candidate cell that meets the first condition at a later instant when the first condition is met. The terminal device not immediately triggering the conditional handover judgment at the first instant provides more implementation flexibility.

[0085] It should be understood that the handover process initiated by the terminal device occurs before the second or fourth time point. For example, the handover process may be initiated at the first time point. Alternatively, the handover process may be initiated after the first time point but before the second or fourth time point. The meaning of the handover process initiation times mentioned below (such as the fifth, sixth, and seventh time points) is the same and will not be repeated hereafter.

[0086] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: at a first moment, the terminal device initiates a handover procedure to a candidate cell that meets the second condition; or, at the moment the first event is met, the terminal device initiates a handover procedure to a candidate cell that meets the second condition. That is, if the first event is met, the terminal device can trigger the handover procedure to a candidate cell that meets the second condition at the moment the first event is met (i.e., the first moment). Initiating a handover procedure to a candidate cell that meets the second condition helps improve the success rate of conditional handover.

[0087] In some embodiments, the second condition described above is related to the measurement results (e.g., cell-level measurement results) of the candidate cells. For example, the second condition may include: the cell-level measurement result corresponding to the candidate cell is the best among the cell-level measurement results corresponding to one or more candidate cells (i.e., all candidate cells evaluated) by the terminal device. Alternatively, the cell-level measurement result corresponding to the candidate cell is the best among all candidate cells evaluated by the terminal device.

[0088] It should be noted that the embodiments of this application do not limit the terminal device to initiate a handover process to a candidate cell that meets the second condition at the first moment. In fact, the terminal device can initiate a handover process to a candidate cell that meets the second condition at any time between the first moment and the second moment.

[0089] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: if the third condition is met, the terminal device initiates a handover procedure to the candidate cell that meets the first condition, or the terminal device initiates a handover procedure to the candidate cell that meets the second condition. For a detailed description of the first and second conditions, please refer to the above text; they will not be repeated here.

[0090] As an example, if the third condition is met, the terminal device can initiate a handover procedure to a candidate cell that meets the first condition. When the third condition is met, the terminal device selects a candidate cell that meets the first condition for handover, which helps improve the success rate of conditional handover.

[0091] In some embodiments, if there are multiple candidate cells that meet the first condition when the third condition is met, the terminal device can arbitrarily select one of the multiple candidate cells that meet the first condition to initiate a handover procedure. However, the embodiments of this application are not limited to this. For example, if there are multiple candidate cells that meet the first condition, the terminal device can select the candidate cell with the best cell-level measurement result from the multiple candidate cells that meet the first condition to initiate a handover procedure, etc.

[0092] As another example, if the third condition is met, the terminal device can initiate a handover procedure to a candidate cell that meets the second condition. In other words, if the third condition is met, the terminal device can select the candidate cell with the best cell-level measurement results to initiate the handover procedure. Choosing a candidate cell that meets the second condition for handover when the third condition is met helps improve the success rate of conditional handover.

[0093] In some embodiments, the third condition is related to the measurement results (such as cell-level measurement results) of the serving cell of the terminal device. For example, the third condition may include: the cell-level measurement result of the serving cell is less than or equal to a first threshold.

[0094] In some embodiments, the first threshold is a measurement result judgment threshold. This application does not limit the configuration method of the first threshold. For example, the first threshold may be a measurement result judgment threshold configured by the network device. As another example, the first threshold may be a predefined or preconfigured measurement result judgment threshold.

[0095] In some embodiments, the terminal device can determine whether the third condition is met at the exact moment the first event is satisfied; that is, the terminal device can determine whether the third condition is met at the first instant. In some embodiments, when the terminal device meets the third condition at the first instant, the terminal device can initiate a handover procedure to a candidate cell that meets the first condition or to a candidate cell that meets the second condition at the first instant. The judgment logic for the terminal device to trigger conditional handover at the first instant is simple and easy to implement. Furthermore, additionally judging the third condition helps improve the success rate of conditional handover or helps avoid prematurely triggering conditional handover when the measurement results of the serving cell are still good (avoiding premature handover scenarios). In some embodiments, when the third condition is not met at the first instant, the terminal device can initiate a handover procedure to a candidate cell that meets the first condition or to a candidate cell that meets the second condition at a later instant when the third condition is met. The terminal device not immediately triggering the conditional handover judgment at the first instant provides more flexibility in implementation.

[0096] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: if the fourth condition is met, the terminal device initiates a handover process to the candidate cell that meets the fourth condition.

[0097] In some embodiments, the fourth condition described above is related to the measurement results of the candidate cell (such as cell-level measurement results) and the measurement results of the serving cell (such as cell-level measurement results).

[0098] As an example, the fourth condition may include: the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell, but the duration corresponding to the state where the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell up to the current time is less than the first duration threshold, and the cell-level measurement result of the serving cell is less than or equal to the first threshold. For an explanation of the first duration threshold and the first threshold, please refer to the above text; they will not be repeated here.

[0099] As another example, the fourth condition could include: the cell-level measurement result corresponding to the candidate cell is the best among all cell-level measurement results corresponding to all candidate cells, and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold. For an explanation of the first threshold, please refer to the above text; it will not be repeated here.

[0100] As another example, the fourth condition could include: the cell-level measurement result corresponding to the candidate cell is greater than the second threshold, and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold. For a description of the second and first thresholds, please refer to the above text; they will not be repeated here.

[0101] In some embodiments, if there are multiple candidate cells that meet the fourth condition, the terminal device can arbitrarily select one of the multiple candidate cells that meet the fourth condition to initiate a handover procedure. However, the embodiments of this application are not limited to this. For example, if there are multiple candidate cells that meet the fourth condition, the terminal device can select the candidate cell with the best cell-level measurement result from the multiple candidate cells that meet the fourth condition to initiate a handover procedure, etc.

[0102] In some embodiments, the terminal device may initiate a handover procedure to a candidate cell that meets the fourth condition at the exact moment the fourth condition is met. In some embodiments, the terminal device may initiate a handover procedure to a candidate cell that meets the fourth condition after a certain period of time has elapsed since the fourth condition was met.

[0103] In some embodiments, the terminal device can determine whether the fourth condition is met at the exact moment the first event is satisfied; that is, the terminal device can determine whether the fourth condition is met at the first instant. In some embodiments, when the terminal device meets the fourth condition at the first instant, the terminal device can initiate a handover procedure to a candidate cell that meets the fourth condition at the first instant. The judgment logic for the terminal device to trigger conditional handover at the first instant is simple and easy to implement. Furthermore, the additional judgment of the fourth condition helps to improve the success rate of conditional handover and increases reliability. In some embodiments, when the fourth condition is not met at the first instant, the terminal device can initiate a handover procedure to a candidate cell that meets the fourth condition at a later instant when the fourth condition is met. The terminal device not immediately triggering the conditional handover judgment at the first instant provides more flexibility in implementation.

[0104] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: upon reaching a fifth time point, the terminal device initiates a handover procedure to one of the one or more candidate cells. The time interval between the fifth time point and the first time point is a third duration; for example, the fifth time point is after the first time point, and the time interval between them is the third duration. In other words, the terminal device can determine the time to initiate the handover procedure based on the first time point and the third duration.

[0105] In some embodiments, the third duration may be greater than or equal to 0 and less than the first duration.

[0106] In some embodiments, the fifth moment can be equal to the first moment, i.e., the third duration is equal to 0. In some embodiments, the fifth moment can be after the first moment and before the second moment, i.e., the third duration is greater than 0 and less than the first duration.

[0107] This application does not limit which candidate cell the terminal device initiates a handover procedure to at the fifth time point. For example, at the fifth time point, the terminal device may initiate a handover procedure to a candidate cell that meets the second condition. As another example, at the fifth time point, the terminal device may initiate a handover procedure to a candidate cell that meets the first condition. Yet another example, at the fifth time point, the terminal device may initiate a handover procedure to a candidate cell that meets the fourth condition, and so on.

[0108] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: upon reaching a sixth time, the terminal device initiates a handover procedure to one of the one or more candidate cells. The time interval between the sixth time and the second time is a fourth duration; for example, the sixth time is before the second time, and the time interval between them is the fourth duration. In other words, the terminal device can determine the time to initiate the handover procedure based on the second time and the fourth duration.

[0109] In some embodiments, the fourth duration may be greater than 0 and less than or equal to the first duration.

[0110] In some embodiments, the sixth moment can be equal to the first moment, that is, the fourth duration is equal to the first duration. In some embodiments, the sixth moment can be after the first moment and before the second moment, that is, the fourth duration can be greater than 0 and less than the first duration.

[0111] This application does not limit which candidate cell the terminal device initiates a handover procedure to at the sixth time. For example, at the sixth time, the terminal device may initiate a handover procedure to a candidate cell that meets the second condition. As another example, at the sixth time, the terminal device may initiate a handover procedure to a candidate cell that meets the first condition. Yet another example, at the sixth time, the terminal device may initiate a handover procedure to a candidate cell that meets the fourth condition, and so on.

[0112] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: upon reaching a seventh time, the terminal device initiates a handover procedure to one of the one or more candidate cells. The seventh time can be any time between the first time and the second time. In other words, the terminal device can select a seventh time between the first and second time, and then select a candidate cell at that seventh time to initiate the handover procedure.

[0113] As an example, the seventh time point can be equal to the first time point, meaning the terminal device can initiate a handover procedure to a candidate cell at the first time point based on the implementation choice. As another example, the seventh time point can be located between the first and second time points.

[0114] This application does not limit which candidate cell the terminal device initiates a handover procedure to at the seventh time. For example, at the seventh time, the terminal device may initiate a handover procedure to a candidate cell that meets the second condition. As another example, at the seventh time, the terminal device may initiate a handover procedure to a candidate cell that meets the first condition. Yet another example, at the seventh time, the terminal device may initiate a handover procedure to a candidate cell that meets the fourth condition, and so on.

[0115] It should be noted that the various methods for triggering pre-conditional handover by terminal devices mentioned above can be used individually or in combination, and this application embodiment does not limit this. For example, the terminal device can initiate a handover procedure by selecting a candidate cell that meets the first condition and / or the fourth condition at the fifth time. Alternatively, the terminal device can initiate a handover procedure by selecting a candidate cell that meets the first condition and / or the fourth condition at the sixth time. Yet another example is that the terminal device can initiate a handover procedure by selecting a candidate cell that meets the first condition and / or the fourth condition at the seventh time, and so on.

[0116] The preceding text described how, in Scenario 1, when the first event is met, the terminal device triggers conditional handover before the handover conditions associated with any candidate cell are met. However, the embodiments of this application are not limited to this. For example, if the first event is met, the terminal device can send a warning message (i.e., the first message below) to the network device to send information related to the RLF event predicted by the terminal device to the network device. This will be described below.

[0117] In some embodiments, at a first moment, if the terminal device predicts that at any time before the terminal device triggers an RLF event in the serving cell, no candidate cell satisfies the first condition, the terminal device may send first information to the network device. The first information is related to the RLF event predicted by the terminal device. The moment when the terminal device predicts that it will trigger an RLF event in the serving cell may be a second moment or a fourth moment.

[0118] In other words, if the first event is met, the terminal device may not be able to find a candidate cell that meets the first condition. Therefore, the terminal device cannot initiate a handover procedure to a candidate cell that meets the first condition in advance. In this case, the terminal device can send the first information to the network device.

[0119] As an example, if no candidate cell meets the first condition at the first moment, the terminal device can send the first information to the network device.

[0120] As another example, if the terminal device predicts that at any time between the first moment and the moment when the terminal device triggers the RLF event in the serving cell, no candidate cell satisfies the first condition, the terminal device may send the first information to the network device.

[0121] As another example, if the terminal device predicts that at some point between the first moment and the moment when the terminal device triggers the RLF event in the serving cell (such as the fifth moment, the sixth moment, or the seventh moment), no candidate cell meets the first condition, then the terminal device can send the first information to the network device.

[0122] As another example, if no cell meets the first condition at some point between the arrival of the first time and the time when the terminal device triggers the RLF event in the serving cell (such as the fifth time, the sixth time, or the seventh time), the terminal device sends the first information to the network device.

[0123] In some embodiments, at a first moment, if the terminal device predicts that at any time before the terminal device triggers an RLF event in the serving cell, no candidate cell satisfies the fourth condition, the terminal device may send first information to the network device. The first information is related to the RLF event predicted by the terminal device. The moment when the terminal device predicts that it will trigger an RLF event in the serving cell may be a second moment or a fourth moment.

[0124] In other words, if the first event is met, the terminal device may not be able to find a candidate cell that meets the fourth condition. Therefore, the terminal device cannot initiate a handover procedure to a candidate cell that meets the fourth condition in advance. In this case, the terminal device can send the first information to the network device.

[0125] As an example, if no candidate cell meets the fourth condition at the first moment, the terminal device can send the first information to the network device.

[0126] As another example, if the terminal device predicts at any time between the first moment and the moment when the terminal device triggers the RLF event in the serving cell, no candidate cell satisfies the fourth condition, then the terminal device may send the first information to the network device.

[0127] As another example, if the terminal device predicts that at some point between the first moment and the moment when the terminal device triggers the RLF event in the serving cell (such as the fifth moment, the sixth moment, or the seventh moment), no candidate cell satisfies the fourth condition, then the terminal device can send the first information to the network device.

[0128] As another example, if no cell meets the fourth condition at some point between the arrival of the first time and the time when the terminal device triggers the RLF event in the serving cell (such as the fifth time, the sixth time, or the seventh time), the terminal device sends the first information to the network device.

[0129] However, the embodiments of this application are not limited to the terminal device sending the first information to the network device only when no candidate cell that meets the conditions (e.g., the first condition or the fourth condition) can be found. For example, the terminal device can send the first information to the network device as long as the first event is met; that is, if the first event is met, the terminal device can send the first information to the network device.

[0130] After the terminal device sends the first piece of information to the network device, the network device can obtain this information before the terminal device actually triggers an RLF event, thus assisting the network device in adjusting its policies in a timely manner. For example, the network device can trigger a timely handover command to switch the terminal device to a different cell, thereby preventing the terminal device from actually triggering an RLF event and improving the user's throughput experience.

[0131] In some embodiments, the first information may include second and / or third information. The second information may be used to indicate that the terminal device predicts it will trigger an RLF event in the serving cell at a future time. The third information may be used to indicate relevant information about the predicted RLF event. Reporting the third information to the network device by the terminal device serves two purposes: firstly, it allows the network device to know the current best beam (or cell) situation or the best beam (or cell) situation predicted by the terminal device at the expected time of the RLF event, thus facilitating timely policy adjustments by the network device (e.g., updating the radio link monitoring configuration, changing the serving beam for the terminal device, or performing cell handover based on the third information), preventing the RLF event from actually occurring; secondly, it allows the network device to assess the urgency of the RLF event and adjust its policies flexibly.

[0132] This application does not limit the third information reported by the terminal device. For example, the third information may include information related to the predicted RLF event obtained by the terminal device through the actual measurement process. As another example, the third information may include information related to the predicted RLF event obtained by the terminal device through the prediction process. Yet another example, the third information may include both information related to the predicted RLF event obtained by the terminal device through the actual measurement process and information obtained through the prediction process.

[0133] For example, the third information may include one or more of the following: beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device; beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device; cell-level measurement result of the serving cell at the first moment actually measured by the terminal device; cell-level measurement result of the serving cell at the moment when the RLF event is predicted to be triggered by the terminal device; and fourth information.

[0134] In some embodiments, the fourth information described above can be used to indicate the length of the time interval between the time when the terminal device predicts the RLF event will trigger and the time when the first information is reported. In this way, the network device can determine the time when the predicted RLF event will trigger based on the time when the first information is reported and the fourth information.

[0135] It should be noted that the "time when the terminal device predicts the triggering of the RLF event" mentioned above may be the second time or the fourth time, and the embodiments of this application do not limit it.

[0136] In some embodiments, the first beam set is either a beam set used by the terminal device to perform RLF monitoring tasks or a beam set composed of reference beams indicated in the cell configuration corresponding to one or more candidate cells. In other words, the first beam set can be used by the terminal device to perform RLF monitoring, or the first beam set can be used by the terminal device to determine whether the handover conditions associated with any candidate cell are met.

[0137] In some embodiments, when the third information includes one or more of the following, the network device can know the current best beam configuration or the best beam configuration predicted by the terminal device at the time when the RLF event is expected to occur, so that the network device can adjust its strategy in a timely manner to avoid the RLF event actually occurring: beam identification information corresponding to the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, beam measurement result corresponding to the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, beam identification information corresponding to the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device, and beam measurement result corresponding to the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device.

[0138] In some embodiments, when the third information includes one or more of the following, the network device can assess the urgency of the RLF event occurring at the terminal device based on the third information, so as to flexibly adjust the strategy: beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device; beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device; cell-level measurement result of the serving cell at the first moment actually measured by the terminal device; cell-level measurement result of the serving cell at the moment when the RLF event is predicted to be triggered by the terminal device; and fourth information.

[0139] In some embodiments, the third information may include one of the information listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device. As yet another example, the third information may include the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device. As yet another example, the third information may include the cell-level measurement result of the serving cell at the moment the RLF event is predicted to be triggered by the terminal device. As yet another example, the third information may include fourth information.

[0140] In some embodiments, the third information may include two of the information listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, and the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, and the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, and the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device. As yet another example, the third information may include the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the cell-level measurement result of the serving cell at the moment the RLF event is predicted to be triggered by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, and the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to trigger by the terminal device, and the cell-level measurement result of the serving cell at the moment the RLF event is predicted to trigger by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, and fourth information. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to trigger by the terminal device, and fourth information. As another example, the third information may include the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and fourth information. As another example, the third information may include the cell-level measurement result of the serving cell at the moment the RLF event is predicted to trigger by the terminal device, and fourth information.

[0141] In some embodiments, the third information may include three of the information listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, and the cell-level measurement result of the serving cell at the first moment, as measured by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, and the cell-level measurement result of the serving cell at the moment when the RLF event is predicted to trigger by the terminal device. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, and fourth information. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, and the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, and the cell-level measurement result of the serving cell at the time the RLF event is predicted to trigger by the terminal device. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, and fourth information. As yet another example, the third information may include the cell-level measurement results of the serving cell at the first moment actually measured by the terminal device, the cell-level measurement results of the serving cell at the moment when the RLF event is predicted to be triggered by the terminal device, and the fourth information.

[0142] In some embodiments, the third information may include four of the information listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the terminal device predicts the RLF event will trigger, and the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment the terminal device predicts the RLF event will trigger. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the cell-level measurement result of the serving cell at the moment the terminal device predicts the RLF event will trigger. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the fourth information. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the moment when the RLF event is predicted to trigger by the terminal device, and the fourth information. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the cell-level measurement result of the serving cell at the time the RLF event is predicted to trigger by the terminal device. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time the RLF event is predicted to trigger by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the fourth information.As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device, the cell-level measurement result of the serving cell at the time when the RLF event is predicted to be triggered by the terminal device, and the fourth information.

[0143] In some embodiments, the third information may include five of the information listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, and the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device, and the cell-level measurement result of the serving cell at the moment when the RLF event is predicted to be triggered by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the terminal device predicts the RLF event will trigger, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment the terminal device predicts the RLF event will trigger, and the fourth information. As yet another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the moment the terminal device predicts the RLF event will trigger, and the fourth information.As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the time when the RLF event is predicted to be triggered by the terminal device, and the fourth information.

[0144] In some embodiments, the third information may include six items listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the cell-level measurement result of the serving cell at the moment the RLF event is predicted to be triggered by the terminal device. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, and the fourth information. As another example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the RLF event is predicted to be triggered by the terminal device, the cell-level measurement result of the serving cell at the moment when the RLF event is predicted to be triggered by the terminal device, and the fourth information.

[0145] In some embodiments, the third information may include the seven items listed above. As an example, the third information may include the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment actually measured by the terminal device, the beam identifier information corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, the beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment the RLF event is predicted to be triggered by the terminal device, the cell-level measurement result of the serving cell at the first moment actually measured by the terminal device, the cell-level measurement result of the serving cell at the moment the RLF event is predicted to be triggered by the terminal device, and the fourth information.

[0146] Scenario 2: The first event is related to condition switching.

[0147] In scenario 2, the first event is related to conditional handover. In other words, the first event includes events that occur during the conditional handover process. For example, the first event includes events that occur during the process by which the terminal device evaluates whether the handover conditions associated with any one of one or more candidate cells are met.

[0148] In scenario 2, the first event may be related to the moment when the handover conditions associated with at least one candidate cell are met.

[0149] In some embodiments, the first event may include: at a first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after a first duration. That is, during the period when the terminal device is evaluating whether the handover conditions associated with any one of the one or more candidate cells are met, if the terminal device predicts at a first moment that the handover conditions associated with at least one candidate cell will be met after a first duration, the terminal device may trigger conditional handover in advance (i.e., attempt to leave the serving cell and access one of the one or more candidate cells).

[0150] For an introduction to the handover conditions of the first moment, the first duration, and the association of candidate cells, please refer to the relevant introduction in Scenario 1 above. For the sake of brevity, it will not be repeated here.

[0151] In scenario 2, if the first event is met, the terminal device can perform a preset behavior. In some embodiments, this preset behavior is related to conditional handover. For example, if the first event is met, the terminal device can trigger conditional handover before the handover condition associated with any one of the candidate cells in one or more candidate cells is met. In some embodiments, the terminal device triggering conditional handover before the handover condition associated with any one candidate cell is met can be understood or replaced as the terminal device attempting to leave the serving cell and access one of the one or more candidate cells configured for the terminal device by the network device before the handover condition associated with any one candidate cell is met.

[0152] In Scenario 2, the terminal device can determine whether to trigger conditional handover in advance based on when the handover conditions are met. In other words, the terminal device can perform conditional handover in advance if it predicts that the handover conditions of a candidate cell will be met after a certain period of time. This helps to avoid problems of premature or late handover due to unreasonable configuration, thereby increasing the probability of successful conditional handover and optimizing the throughput experience of the terminal device.

[0153] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: at a first moment, the terminal device initiates a handover procedure to a candidate cell that meets a fifth condition. The fifth condition is that the handover conditions associated with the candidate cell will be met after a first time period. That is, while evaluating whether the handover conditions associated with any one or more candidate cells are met, if the terminal device predicts at the first moment that the handover conditions associated with at least one candidate cell will be met after the first time period, the terminal device immediately (i.e., at the first moment) initiates a handover procedure to the candidate cell that meets the fifth condition. In this case, triggering conditional handover in advance helps avoid scenarios where handover is too late. Furthermore, this method of immediately initiating a handover procedure after predicting that the handover conditions associated with at least one candidate cell will be met after the first time period is relatively simple for the terminal device to implement.

[0154] In some embodiments, if there are multiple candidate cells that meet the fifth condition, the terminal device can arbitrarily select one of the multiple candidate cells that meet the fifth condition to initiate a handover procedure. However, the embodiments of this application are not limited to this. For example, if there are multiple candidate cells that meet the fifth condition, the terminal device can select the candidate cell with the best cell-level measurement result from the multiple candidate cells that meet the fifth condition to initiate a handover procedure, etc.

[0155] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: upon reaching the eighth time, the terminal device initiates a handover procedure to a candidate cell that meets the sixth condition. Specifically, at the eighth time, the cell-level measurement result of the serving cell of the terminal device is less than or equal to the third threshold.

[0156] In some embodiments, the eighth time is equal to the first time; in some embodiments, the eighth time is a time that occurs after the first time. This application does not limit this.

[0157] In some embodiments, the sixth condition is related to one or more of the following: whether the handover condition associated with the candidate cell is met within the first time period, and the distance between the time when the handover condition associated with the candidate cell is met and the eighth time period.

[0158] As an example, the sixth condition could include: the handover conditions associated with the candidate cell will be met within the first time period.

[0159] As another example, the sixth condition could include: the handover conditions associated with the candidate cell will be met within the first time period, and the time when the handover conditions associated with the candidate cell are met is the shortest from the eighth time period. In other words, the sixth condition could include: the handover conditions associated with the candidate cell will be met earliest within the first time period.

[0160] In some embodiments, the third threshold is a measurement result judgment threshold. This application does not limit the configuration method of the third threshold. For example, the third threshold may be a measurement result judgment threshold configured by the network device. Or, for another example, the third threshold may be a predefined or pre-configured measurement result judgment threshold. The configuration method of the third threshold will be described later and will not be detailed here.

[0161] In other words, while the terminal device is evaluating whether the handover conditions associated with any one or more candidate cells are met, even if the terminal device predicts at the first moment that the handover conditions associated with at least one of the candidate cells will be met after a first duration, the terminal device will not necessarily initiate a handover procedure immediately. Instead, it will continue to determine whether the cell-level measurement result of the serving cell is less than or equal to the third threshold. If, at the first moment, the cell-level measurement result of the serving cell is less than or equal to the third threshold, then the eighth moment is equal to the first moment, and the terminal device will initiate a handover procedure to the candidate cell that meets the sixth condition at the eighth moment (i.e., the first moment). Otherwise, if, at the first moment, the cell-level measurement result of the serving cell is greater than the third threshold, the terminal device needs to wait until the cell-level measurement result of the serving cell is less than or equal to the third threshold (i.e., the eighth moment) before initiating a handover procedure to the candidate cell that meets the sixth condition. In this way, the terminal device's behavior of triggering conditional handover in advance not only considers whether the handover conditions associated with the candidate cells are met, but also considers the cell-level measurement result of the terminal device's serving cell. Terminal devices consider whether the handover conditions associated with candidate cells are met, which helps to avoid scenarios where handover is too late. Furthermore, terminal devices consider the cell-level measurement results of the serving cell, which helps to avoid scenarios where handover is too early. This can further improve the probability of successful handover and optimize the performance of the communication system.

[0162] In some embodiments, if there are multiple candidate cells that meet the sixth condition, the terminal device can arbitrarily select one of the multiple candidate cells that meet the sixth condition to initiate a handover procedure. However, the embodiments of this application are not limited to this. For example, if there are multiple candidate cells that meet the sixth condition, the terminal device can select the candidate cell with the best cell-level measurement result from the multiple candidate cells that meet the sixth condition to initiate a handover procedure, etc.

[0163] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: at a first moment or at a moment after the first moment, the terminal device may initiate a handover procedure to a candidate cell that meets the first condition.

[0164] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: at a first moment or at a moment after the first moment, the terminal device may initiate a handover procedure to a candidate cell that meets the second condition.

[0165] In some embodiments, triggering conditional handover before the handover conditions associated with any candidate cell are met may include: at a first moment or at a moment after the first moment, the terminal device may initiate a handover procedure to a candidate cell that meets the fourth condition.

[0166] For an explanation of the first, second, and fourth conditions, please refer to the explanation in Scenario 1. For the sake of brevity, they will not be repeated here.

[0167] The above text mentioned various parameters (such as the first duration, the second duration, and the first threshold). The following text will introduce how to obtain these parameters.

[0168] As one implementation method, the various parameters mentioned above can be configured by the network device. For example, the terminal device can obtain the values ​​of the various parameters mentioned above through dedicated signaling or system broadcast messages.

[0169] Referring again to Figure 2, in some embodiments, the method shown in Figure 2 may further include step S205. In step S205, the terminal device receives configuration information (i.e., one or more configuration information) sent by the network device, and correspondingly, the network device sends the configuration information to the terminal device.

[0170] In some embodiments, the above configuration information is related to the behavior of triggering conditional handover before the handover conditions associated with the first event and / or the terminal device in any candidate cell are met.

[0171] In some embodiments, the configuration information described above may include first configuration information. That is, the terminal device can receive the first configuration information sent by the network device, and correspondingly, the network device sends the first configuration information to the terminal device. For example, in scenario 1, the configuration information described above may include first configuration information.

[0172] In some embodiments, the first configuration information is related to the first event.

[0173] In some embodiments, the first configuration information may include one or more of a first parameter and a second parameter. The first parameter may be used to indicate a first duration. The second parameter may be used to indicate a second duration.

[0174] In some embodiments, the first configuration information may include a first parameter. The first parameter may be used to indicate the value of a first duration. For example, if the first event includes a situation where the terminal device predicts at a first moment that it will trigger a radio link failure in the serving cell at a second moment after the first duration, and the terminal device predicts at the first moment that the handover conditions associated with any of the candidate cells within the first duration are not met, the first configuration information may include the first parameter.

[0175] In some embodiments, the first configuration information may include a second parameter. The second parameter may be used to indicate the value of the second duration. For example, if the first event includes a scenario where the terminal device predicts at a first moment that the time interval between the third and fourth moments is less than or equal to the second duration, the first configuration information may include the second parameter.

[0176] In some embodiments, the first configuration information may include a first parameter and a second parameter. The first parameter may be used to indicate the value of a first duration. The second parameter may be used to indicate the value of a second duration. For example, if the first event includes a scenario where the terminal device predicts at a first moment that the time interval between a third moment and a fourth moment is less than or equal to the second duration, the first configuration information may include both the first parameter and the second parameter. For example, the first duration in the first parameter may indicate the duration between the first moment and the fourth moment.

[0177] In some embodiments, the configuration information described above may include second configuration information. That is, the terminal device can receive the second configuration information sent by the network device, and correspondingly, the network device can send the second configuration information to the terminal device. For example, in scenario 1, the configuration information described above may include second configuration information.

[0178] In some embodiments, the second configuration information is related to the behavior of the terminal device in triggering conditional handover before the handover conditions associated with any candidate cell are met.

[0179] In some embodiments, the second configuration information may include one or more of a third parameter, a fourth parameter, a fifth parameter, and a sixth parameter. An explanation of the third, fourth, fifth, and sixth parameters can be found below.

[0180] In some embodiments, the second configuration information may include a third parameter. The third parameter may be used to indicate the value of the first threshold. For example, when determining a candidate cell to initiate a handover procedure based on a third condition, the second configuration information may include the third parameter.

[0181] In some embodiments, the second configuration information may include a fourth parameter. The fourth parameter may be used to indicate the value of the second threshold. For example, when a candidate cell for initiating a handover procedure is determined based on a first condition, the second configuration information may include a third parameter.

[0182] In some embodiments, the second configuration information may include a third parameter and a fourth parameter. The third parameter may be used to indicate the value of the first threshold. The fourth parameter may be used to indicate the value of the second threshold. For example, when determining a candidate cell to initiate a handover procedure based on a fourth condition, the second configuration information may include the third parameter and the fourth parameter.

[0183] In some embodiments, the second configuration information may include a fifth parameter. The fifth parameter may be used to indicate the value of a third duration. For example, when determining a candidate cell to initiate a handover procedure based on a fifth time point, the second configuration information may include the fifth parameter.

[0184] In some embodiments, the second configuration information may include a sixth parameter. The sixth parameter may be used to indicate the value of the fourth duration. For example, when determining a candidate cell to initiate a handover procedure based on a sixth time point, the second configuration information may include the sixth parameter.

[0185] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter and the third parameter.

[0186] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter and the fourth parameter.

[0187] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter, the third parameter, and the fourth parameter.

[0188] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter and the fifth parameter.

[0189] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter and the sixth parameter.

[0190] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter, the second parameter, and the third parameter.

[0191] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter, the second parameter, and the fourth parameter.

[0192] In some embodiments, the configuration information may include first configuration information and second configuration information to configure a first parameter, a second parameter, a third parameter, and a fourth parameter.

[0193] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter, the second parameter, and the fifth parameter.

[0194] In some embodiments, the configuration information may include first configuration information and second configuration information to configure the first parameter, the second parameter, and the sixth parameter.

[0195] In some embodiments, the first configuration information and the second configuration information may be different configuration information, or in other words, the first configuration information and the second configuration information may be carried in different messages (e.g., carried in different system broadcast messages). In some embodiments, the first configuration information and the second configuration information may be the same configuration information, or in other words, the first configuration information and the second configuration information may be carried in the same message (e.g., carried in the same reconfiguration message).

[0196] In some embodiments, the configuration information described above may include third configuration information. That is, the terminal device can receive third configuration information sent by the network device, and correspondingly, the network device sends third configuration information to the terminal device. For example, in scenario 2, the configuration information described above may include third configuration information.

[0197] In some embodiments, the third configuration information is related to the behavior of triggering conditional handover before the handover conditions associated with the first event and / or the terminal device in any candidate cell are met.

[0198] In some embodiments, the third configuration information may include one or more of a seventh parameter and an eighth parameter. The seventh parameter may be used to indicate the value of a first duration. The eighth parameter may be used to indicate the value of a third threshold.

[0199] In some embodiments, the third configuration information may include a seventh parameter. The seventh parameter may be used to indicate the value of the first duration. For example, if the first event includes a scenario where the terminal device predicts at a first moment that the handover conditions associated with at least one candidate cell are met after the first duration, the third configuration information may include the seventh parameter. As another example, if the first event includes a scenario where the terminal device predicts at a first moment that the handover conditions associated with at least one candidate cell are met after the first duration, and initiates a handover procedure to a candidate cell that meets the fifth condition, the third configuration information may include the seventh parameter.

[0200] In some embodiments, the third configuration information may include a seventh parameter and an eighth parameter. The seventh parameter may be used to indicate the value of the first duration. The eighth parameter may be used to indicate the value of the third threshold. For example, when the first event includes the terminal device predicting at a first moment that the handover conditions associated with at least one candidate cell are met after the first duration, and initiating a handover procedure to a candidate cell that meets the sixth condition, the third configuration information includes the seventh parameter and the eighth parameter.

[0201] As another implementation, the various parameters mentioned above can be predefined (such as protocol predefined) or preconfigured. For example, the first to eighth parameters mentioned above are all predefined or preconfigured.

[0202] As another implementation, some of the parameters mentioned above can be configured by the network device, while others can be predefined or preconfigured. For example, the first to sixth parameters are configured by the network device, while the seventh and eighth parameters are predefined or preconfigured. Alternatively, the first and second parameters, as well as the seventh parameter, are configured by the network device, while the third to sixth parameters, and the eighth parameter are predefined or preconfigured.

[0203] In some embodiments, the terminal device may send capability information to the network device, and correspondingly, the network device may receive the capability information sent by the terminal device. This capability information may be used to indicate whether the terminal device supports the RLF event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

[0204] As an example, capability information may include first capability information. The first capability information is used to indicate whether the terminal device supports the RLF event prediction function.

[0205] As another example, capability information may include second capability information. This second capability information indicates whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

[0206] As another example, capability information may include first capability information and second capability information. The first capability information indicates whether the terminal device supports the RLF event prediction function. The second capability information indicates whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

[0207] In some embodiments, the first capability information and the second capability information may be carried in different messages. In some embodiments, the first capability information and the second capability information may be carried in the same message.

[0208] It should be noted that, in some embodiments, the aforementioned capability information may be reported by the terminal device to the current serving cell. In some embodiments, the aforementioned capability information may be reported by the terminal device to the serving cell where the terminal device is located during the registration process, and then reported by the serving cell to the core network. Subsequently, the core network may provide the aforementioned capability information to the terminal device's current serving cell.

[0209] In some embodiments, the current serving cell of the terminal device may send the various configuration information mentioned above to the terminal device based on the capability information reported by the terminal device or the capability information indicated by the core network.

[0210] In some embodiments, the network device receiving capability information and the network device sending configuration information (or receiving first information) are the same network device. In other embodiments, the network device receiving capability information and the network device sending configuration information (or receiving first information) are different network devices. This application does not limit this.

[0211] In some embodiments, the network device may instruct the terminal device whether it is permitted to trigger conditional handover before the handover conditions associated with any candidate cell are met. As one implementation, the terminal device may receive instruction information sent by the network device, and correspondingly, the network device may send instruction information to the terminal device. This instruction information can be used to indicate whether the terminal device is permitted to trigger conditional handover before the handover conditions associated with any candidate cell are met.

[0212] The method embodiments of this application have been described in detail above with reference to Figures 1 to 3. The apparatus embodiments of this application will be described in detail below with reference to Figures 4 to 6. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the preceding method embodiments.

[0213] Figure 4 is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. The terminal device 400 shown in Figure 4 includes a handover module 410. The handover module 410 can be used to trigger a conditional handover before the handover condition associated with any one of the candidate cells is met, if a first event is satisfied; wherein, the first event is related to the conditional handover, or, the first event is related to the conditional handover and the RLF event predicted by the terminal device.

[0214] In some embodiments, the first event includes: at a first moment, the terminal device predicts that at a second moment after a first duration, the terminal device will trigger an RLF in the serving cell, and at the first moment, the terminal device predicts that the handover conditions associated with any of the candidate cells within the first duration are not met; or at a first moment, the terminal device predicts that the time interval between a third moment and a fourth moment is less than or equal to a second duration, wherein the third moment is the earliest moment when the handover conditions associated with at least one of the one or more candidate cells predicted by the terminal device are met, and the fourth moment is the moment when the terminal device predicts that the terminal device will trigger an RLF in the serving cell; wherein the first moment is the current moment of the terminal device.

[0215] In some embodiments, the terminal device further includes: a first receiving module 420, configured to receive first configuration information sent by a network device, the first configuration information being related to the first event, the first configuration information including: a first parameter, the first parameter being used to indicate the value of the first duration; or a second parameter, the second parameter being used to indicate the value of the second duration; or a first parameter and a second parameter, the first parameter being used to indicate the value of the first duration and the second parameter being used to indicate the value of the second duration.

[0216] In some embodiments, the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met includes: if a first condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the first condition, wherein the first condition is related to the measurement results of the candidate cell; or at the first moment, the terminal device initiates a handover procedure to a candidate cell that meets a second condition, wherein the second condition is that the cell-level measurement result corresponding to the candidate cell is the best among the cell-level measurement results corresponding to all candidate cells; or if a third condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the first condition or the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the third condition is that the cell-level measurement result of the serving cell is small. The terminal device initiates a handover process to a candidate cell that meets the fourth condition if the condition is equal to or greater than the first threshold; or if the fourth condition is met, the terminal device initiates a handover process to a candidate cell that meets the second condition, wherein the fourth condition is related to the measurement results of the candidate cell and the measurement results of the serving cell; or at the fifth time, the terminal device initiates a handover process to a candidate cell that meets the second condition, wherein the time interval between the fifth time and the first time is a third duration; or at the sixth time, the terminal device initiates a handover process to a candidate cell that meets the second condition, wherein the time interval between the sixth time and the second time is a fourth duration; or at the seventh time, the terminal device initiates a handover process to a candidate cell that meets the second condition, wherein the seventh time is any time between the first time and the second time.

[0217] In some embodiments, the first condition includes any one of the following: the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell, but the duration corresponding to the state that the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell up to the current time is less than a first duration threshold; or the cell-level measurement result corresponding to the candidate cell is greater than a second threshold.

[0218] In some embodiments, the fourth condition includes any one of the following: the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell, but the duration corresponding to the state where the cell-level measurement result corresponding to the candidate cell satisfies the event type indicated in the handover condition associated with the candidate cell up to the current time is less than a first duration threshold, and the cell-level measurement result of the serving cell is less than or equal to the first threshold; or the cell-level measurement result corresponding to the candidate cell is the best among all the cell-level measurement results corresponding to the candidate cells and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold; or the cell-level measurement result corresponding to the candidate cell is greater than a second threshold and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold.

[0219] In some embodiments, the terminal device further includes: a second receiving module, configured to receive second configuration information sent by a network device, the second configuration information being related to the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met, the second configuration information including any one of the following: a third parameter, the third parameter indicating the value of the first threshold; or a fourth parameter, the fourth parameter indicating the value of the second threshold; or a third parameter and a fourth parameter, the third parameter indicating the value of the first threshold and the fourth parameter indicating the value of the second threshold; or a fifth parameter, the fifth parameter indicating the value of the third duration; or a sixth parameter, the sixth parameter indicating the value of the fourth duration.

[0220] In some embodiments, the terminal device further includes: a first sending module, configured to send first information to the network device at the first moment if the terminal device predicts that no candidate cell meets the first condition at any time before the terminal device triggers an RLF event in the serving cell, wherein the first information is related to the RLF event predicted by the terminal device.

[0221] In some embodiments, the terminal device further includes: a second sending module, configured to send first information to the network device at the first moment if the terminal device predicts that no candidate cell satisfies the fourth condition at any time before the terminal device triggers an RLF event in the serving cell, wherein the first information is related to the RLF event predicted by the terminal device.

[0222] In some embodiments, the terminal device further includes a third sending module, configured to send first information to the network device if the first event is satisfied, wherein the first information is related to the RLF event predicted by the terminal device.

[0223] In some embodiments, the first information includes second information and / or third information, wherein the second information is used to indicate that the terminal device predicts that it will trigger an RLF event in the serving cell at a future time, and the third information is used to indicate relevant information about the RLF event predicted by the terminal device.

[0224] In some embodiments, the third information includes one or more of the following: beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first time point actually measured by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first time point actually measured by the terminal device; beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device; cell-level measurement result of the serving cell at the first time point actually measured by the terminal device; cell-level measurement result of the serving cell at the time when the RLF event is predicted to be triggered by the terminal device; and fourth information, which is used to indicate the length of the time interval between the time when the RLF event is predicted to be triggered by the terminal device and the time when the first information is reported; wherein, the first beam set is the beam set used by the terminal device to perform the RLF monitoring task or is a beam set composed of reference beams indicated in the cell configuration corresponding to the one or more candidate cells.

[0225] In some embodiments, the first event includes: at a first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after a first duration; wherein, the first moment is the current moment of the terminal device.

[0226] In some embodiments, the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met includes: at the first time, the terminal device initiates a handover procedure to a candidate cell that meets a fifth condition, wherein the fifth condition is that the handover condition associated with the candidate cell will be met after the first duration; or at the eighth time, the terminal device initiates a handover procedure to a candidate cell that meets a sixth condition, wherein the eighth time is equal to the first time or is a time after the first time, and at the eighth time, the cell-level measurement result of the serving cell of the terminal device is less than or equal to a third threshold.

[0227] In some embodiments, the sixth condition includes any one of the following: the handover condition associated with the candidate cell will be met within the first duration; or the handover condition associated with the candidate cell will be met within the first duration and the time at which the handover condition associated with the candidate cell is met is the shortest from the eighth time.

[0228] In some embodiments, the terminal device further includes: a third receiving module, configured to receive third configuration information sent by a network device, the third configuration information being related to the first event and / or the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met, the third configuration information including any one of the following: a seventh parameter, the seventh parameter being used to indicate the value of the first duration; or a seventh parameter and an eighth parameter, the seventh parameter being used to indicate the value of the first duration, and the eighth parameter being used to indicate the value of a third threshold.

[0229] In some embodiments, the terminal device further includes: a fourth sending module, configured to send capability information to the network device, the capability information being used to indicate whether the terminal device supports RLF event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

[0230] In some embodiments, the switching module 410 may be a processor 610. The terminal device 400 may also include a memory 620 and a transceiver 630, as shown in FIG6.

[0231] Figure 5 is a schematic diagram of the network device provided in an embodiment of this application. The network device 500 shown in Figure 5 includes a sending module 510. The sending module 510 can be used to send configuration information to a terminal device. The configuration information is related to a first event and / or the behavior of triggering conditional handover before the handover condition associated with the terminal device in any one or more candidate cells is met. The first event is related to conditional handover, or the first event is related to conditional handover and the RLF event predicted by the terminal device.

[0232] In some embodiments, the configuration information includes first configuration information related to the first event. The first configuration information includes: a first parameter indicating the value of a first duration; or a second parameter indicating the value of a second duration; or a first parameter and a second parameter, where the first parameter indicates the value of the first duration and the second parameter indicates the value of the second duration. The first event includes: predicting at a first moment that the terminal device will trigger an RLF in the serving cell at a second moment after the first duration and predicting at the first moment that the handover conditions associated with any candidate cell are not met within the first duration; or predicting at a first moment that the time interval between a third moment and a fourth moment is less than or equal to the second duration, wherein the third moment is the earliest moment when the handover conditions associated with at least one candidate cell predicted by the terminal device are met, and the fourth moment is the moment when the terminal device predicts that the terminal device will trigger an RLF in the serving cell; wherein the first moment is the current moment of the terminal device.

[0233] In some embodiments, the configuration information further includes second configuration information, which is related to the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The second configuration information includes any one of the following: a third parameter, which indicates the value of a first threshold; or a fourth parameter, which indicates the value of a second threshold; or a third parameter and a fourth parameter, where the third parameter indicates the value of the first threshold and the fourth parameter indicates the value of the second threshold; or a fifth parameter, which indicates the value of a third duration; or a sixth parameter, which indicates the value of a fourth duration.

[0234] In some embodiments, the network device further includes: a first receiving module 520, configured to receive first information sent by the terminal device, the first information being related to an RLF event predicted by the terminal device.

[0235] In some embodiments, the first information includes second information and / or third information, wherein the second information is used to indicate that the terminal device predicts that it will trigger an RLF event in the serving cell at a future time, and the third information is used to indicate relevant information about the RLF event predicted by the terminal device.

[0236] In some embodiments, the third information includes one or more of the following: beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first time point actually measured by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first time point actually measured by the terminal device; beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device; beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the time when the RLF event is predicted to be triggered by the terminal device; cell-level measurement result of the serving cell at the first time point actually measured by the terminal device; cell-level measurement result of the serving cell at the time when the RLF event is predicted to be triggered by the terminal device; and fourth information, which is used to indicate the length of the time interval between the time when the RLF event is predicted to be triggered by the terminal device and the time when the first information is reported; wherein, the first beam set is the beam set used by the terminal device to perform the RLF monitoring task or is a beam set composed of reference beams indicated in the cell configuration corresponding to the one or more candidate cells.

[0237] In some embodiments, the configuration information includes third configuration information, which is related to the first event and / or the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The third configuration information includes any one of the following: a seventh parameter, which indicates the value of a first duration; or a seventh parameter and an eighth parameter, where the seventh parameter indicates the value of the first duration and the eighth parameter indicates the value of a third threshold. The first event includes: at a first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after the first duration; wherein, the first moment is the current moment of the terminal device.

[0238] In some embodiments, the network device further includes: a second receiving module, configured to receive capability information sent by the terminal device, the capability information being used to indicate whether the terminal device supports RLF event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

[0239] In some embodiments, the transmitting module 510 may be a transceiver 630. The network device 500 may also include a processor 610 and a memory 620, as shown in FIG6.

[0240] Figure 6 is a schematic structural diagram of a communication device according to an embodiment of this application. The dashed lines in Figure 6 indicate that the unit or module is optional. This device 600 can be used to implement the methods described in the above method embodiments. Device 600 can be a chip, a terminal device, or a network device.

[0241] Apparatus 600 may include one or more processors 610. The processor 610 may support apparatus 600 in implementing the methods described in the preceding method embodiments. The processor 610 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 other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0242] The apparatus 600 may further include one or more memories 620. The memories 620 store a program that can be executed by the processor 610, causing the processor 610 to perform the methods described in the preceding method embodiments. The memories 620 may be independent of the processor 610 or integrated within the processor 610.

[0243] The device 600 may also include a transceiver 630. The processor 610 can communicate with other devices or chips via the transceiver 630. For example, the processor 610 can send and receive data with other devices or chips via the transceiver 630.

[0244] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal device or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal device or network device in various embodiments of this application.

[0245] This application also provides a computer program product. The computer program product includes a program. This computer program product can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

[0246] This application also provides a computer program. This computer program can be applied to the terminal device or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal device or network device in various embodiments of this application.

[0247] It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0248] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0249] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0250] In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0251] In the embodiments of this application, the term "comprising" can refer to direct inclusion or indirect inclusion. Optionally, "comprising" in the embodiments of this application can be replaced with "instructing" or "used to determine". For example, "A includes B" can be replaced with "A instructs B" or "A is used to determine B".

[0252] In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0253] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0254] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0255] In the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application.

[0256] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0257] The units described as separate components may or may not be physically separate. 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 the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0258] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0259] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially 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, all or part of the processes or functions described in the embodiments of this application are generated. 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. 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 wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0260] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for wireless communication, comprising: include: If the first event is met, the terminal device triggers conditional handover before the handover conditions associated with any one of the candidate cells in one or more candidate cells are met; The first event is related to condition switching, or the first event is related to condition switching and the wireless link failure event predicted by the terminal device.

2. The method of claim 1, wherein, The first event includes: At the first moment, the terminal device predicts that at the second moment after the first duration, the terminal device will trigger a radio link failure in the serving cell, and at the first moment, the terminal device predicts that the handover conditions associated with any of the candidate cells within the first duration will not be met; or In the first moment, the terminal device predicts that the time interval between the third moment and the fourth moment is less than or equal to the second duration, wherein the third moment is the earliest moment when the handover conditions associated with at least one candidate cell predicted by the terminal device are met, and the fourth moment is the moment when the terminal device predicts that the terminal device will trigger a radio link failure in the serving cell. Wherein, the first moment is the current moment of the terminal device.

3. The method of claim 2, wherein, The method further includes: The terminal device receives first configuration information sent by the network device, the first configuration information being related to the first event, and the first configuration information including: The first parameter indicates the value of the first duration; or The second parameter indicates the value of the second duration; or The first parameter and the second parameter are used to indicate the value of the first duration and the second parameter is used to indicate the value of the second duration.

4. The method according to claim 2 or 3, characterized in that, The conditional handover triggered by the terminal device before the handover conditions associated with any candidate cell are met includes: If the first condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the first condition, wherein the first condition is related to the measurement results of the candidate cell; or At the first moment, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the second condition is that the cell-level measurement result corresponding to the candidate cell is the best among the cell-level measurement results corresponding to all candidate cells; or If the third condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the first condition, or the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the third condition is that the cell-level measurement result of the serving cell is less than or equal to a first threshold; or If the fourth condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the fourth condition, wherein the fourth condition is related to the measurement results of the candidate cell and the measurement results of the serving cell; or Upon reaching the fifth time point, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the time interval between the fifth time point and the first time point is a third duration; or Upon reaching the sixth time point, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the time interval between the sixth time point and the second time point is the fourth duration; or Upon reaching the seventh time, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the seventh time is any time between the first time and the second time.

5. The method of claim 4, wherein, The first condition includes any one of the following: The cell-level measurement results corresponding to the candidate cell meet the event type indicated in the handover conditions associated with the candidate cell, but the duration of the state corresponding to the cell-level measurement results corresponding to the candidate cell meeting the event type indicated in the handover conditions associated with the candidate cell as of the current time is less than the first duration threshold. or The cell-level measurement result corresponding to the candidate cell is greater than the second threshold.

6. The method according to claim 4 or 5, characterized in that, The fourth condition includes any one of the following: The cell-level measurement results corresponding to the candidate cell meet the event type indicated in the handover conditions associated with the candidate cell, but the duration of the state corresponding to the cell-level measurement results corresponding to the candidate cell meeting the event type indicated in the handover conditions associated with the candidate cell up to the current time is less than the first duration threshold, and the cell-level measurement results of the serving cell are less than or equal to the first threshold. or The cell-level measurement result corresponding to the candidate cell is the best among all cell-level measurement results corresponding to the candidate cells, and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold. or The cell-level measurement result corresponding to the candidate cell is greater than the second threshold and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold.

7. The method according to any one of claims 4-6, characterized in that, The method further includes: The terminal device receives second configuration information sent by the network device. The second configuration information is related to the terminal device's behavior of triggering conditional handover before the handover conditions associated with any candidate cell are met. The second configuration information includes any one of the following: A third parameter, wherein the third parameter is used to indicate the value of the first threshold; or The fourth parameter, which indicates the value of the second threshold; or The third parameter and the fourth parameter, wherein the third parameter indicates the value of the first threshold, and the fourth parameter indicates the value of the second threshold; or The fifth parameter, which indicates the value of the third duration; or The sixth parameter is used to indicate the value of the fourth duration.

8. The method according to any one of claims 4-7, characterized in that, The method further includes: At the first moment, if the terminal device predicts that no candidate cell meets the first condition at any time before the terminal device triggers a radio link failure event in the serving cell, the terminal device sends first information to the network device, the first information being related to the radio link failure event predicted by the terminal device.

9. The method according to any one of claims 4-8, characterized in that, The method further includes: At the first moment, if the terminal device predicts that no candidate cell meets the fourth condition at any time before the terminal device triggers a radio link failure event in the serving cell, the terminal device sends first information to the network device, the first information being related to the radio link failure event predicted by the terminal device.

10. The method according to any one of claims 2-7, characterized in that, The method further includes: If the first event is satisfied, the terminal device sends first information to the network device, the first information being related to the wireless link failure event predicted by the terminal device.

11. The method according to any one of claims 8-10, characterized in that, The first information includes second information and / or third information, wherein the second information is used to indicate that the terminal device predicts that it will trigger a radio link failure event in the serving cell at a future time, and the third information is used to indicate relevant information about the radio link failure event predicted by the terminal device.

12. The method of claim 11, wherein, The third information includes one or more of the following: The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered. The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered; The cell-level measurement results of the serving cell actually measured by the terminal device at the first moment; The cell-level measurement results of the serving cell at the moment when the wireless link failure event predicted by the terminal device is triggered; The fourth information is used to indicate the length of the time interval between the time when the terminal device predicts the wireless link failure event and the time when it reports the first information. The first beam set is either the beam set used by the terminal device to perform the wireless link failure monitoring task or a beam set composed of reference beams indicated in the cell configuration corresponding to one or more candidate cells.

13. The method of claim 1, wherein, The first event includes: At the first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after the first duration. Wherein, the first moment is the current moment of the terminal device.

14. The method of claim 13, wherein, The conditional handover triggered by the terminal device before the handover conditions associated with any candidate cell are met includes: At the first moment, the terminal device initiates a handover procedure to a candidate cell that meets the fifth condition, wherein the fifth condition is a handover condition associated with the candidate cell that will be met after the first duration; or Upon reaching the eighth time, the terminal device initiates a handover procedure to a candidate cell that meets the sixth condition, wherein the eighth time is equal to the first time or is a time after the first time, and at the eighth time, the cell-level measurement result of the serving cell of the terminal device is less than or equal to the third threshold.

15. The method of claim 14, wherein, The sixth condition includes any one of the following: The handover conditions associated with the candidate cell will be met within the first time period; or The handover conditions associated with the candidate cell will be met within the first time period, and the time when the handover conditions associated with the candidate cell are met is the shortest from the eighth time period.

16. The method according to any one of claims 13-15, characterized by, The method further includes: The terminal device receives third configuration information sent by the network device. The third configuration information is related to the first event and / or the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The third configuration information includes any one of the following: The seventh parameter, which indicates the value of the first duration; or The seventh parameter and the eighth parameter, wherein the seventh parameter is used to indicate the value of the first duration and the eighth parameter is used to indicate the value of the third threshold.

17. The method of any one of claims 1-16, wherein, The method further includes: The terminal device sends capability information to the network device. The capability information is used to indicate whether the terminal device supports the radio link failure event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

18. A method for wireless communication, comprising: include: The network device sends configuration information to the terminal device. The configuration information is related to a first event and / or the behavior of triggering conditional handover before the handover condition associated with any one of the candidate cells in one or more candidate cells is met. The first event is related to conditional handover, or the first event is related to conditional handover and a radio link failure event predicted by the terminal device.

19. The method of claim 18, wherein, The configuration information includes first configuration information, which is related to the first event. The first configuration information includes: The first parameter, which indicates the value of the first duration; or The second parameter, which indicates the value of the second duration; or The first parameter and the second parameter, the first parameter is used to indicate the value of the first duration, and the second parameter is used to indicate the value of the second duration; The first event includes: In the first moment, it is predicted that the terminal device will trigger a radio link failure in the serving cell in the second moment after the first duration, and in the first moment, it is predicted that the handover conditions associated with any of the candidate cells within the first duration are not met; or The time interval between the first time point and the third time point is predicted to be less than or equal to the second duration, wherein the third time point is the earliest time when the handover conditions associated with at least one candidate cell predicted by the terminal device are met, and the fourth time point is the time when the terminal device predicts that the terminal device will trigger a radio link failure in the serving cell. Wherein, the first moment is the current moment of the terminal device.

20. The method of claim 19, wherein, The configuration information also includes second configuration information, which is related to the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The second configuration information includes any one of the following: The third parameter is used to indicate the value of the first threshold. or The fourth parameter indicates the value of the second threshold. or The third parameter and the fourth parameter, wherein the third parameter is used to indicate the value of the first threshold and the fourth parameter is used to indicate the value of the second threshold; or The fifth parameter, which indicates the value of the third duration; or The sixth parameter is used to indicate the value of the fourth duration.

21. The method of claim 19 or 20, wherein, The method further includes: The network device receives first information sent by the terminal device, the first information being related to a wireless link failure event predicted by the terminal device.

22. The method of claim 21, wherein, The first information includes second information and / or third information, wherein the second information is used to indicate that the terminal device predicts that it will trigger a radio link failure event in the serving cell at a future time, and the third information is used to indicate relevant information about the radio link failure event predicted by the terminal device.

23. The method of claim 22, wherein, The third information includes one or more of the following: The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered. The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered; The cell-level measurement results of the serving cell actually measured by the terminal device at the first moment; The cell-level measurement results of the serving cell at the moment when the wireless link failure event predicted by the terminal device is triggered; The fourth information is used to indicate the length of the time interval between the time when the terminal device predicts the wireless link failure event and the time when it reports the first information. The first beam set is either the beam set used by the terminal device to perform the wireless link failure monitoring task or a beam set composed of reference beams indicated in the cell configuration corresponding to one or more candidate cells.

24. The method of claim 18, wherein, The configuration information includes third configuration information, which is related to the first event and / or the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The third configuration information includes any one of the following: The seventh parameter, which indicates the value of the first duration; or The seventh parameter and the eighth parameter, wherein the seventh parameter is used to indicate the value of the first duration and the eighth parameter is used to indicate the value of the third threshold; The first event includes: At the first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after the first duration. Wherein, the first moment is the current moment of the terminal device.

25. The method of any one of claims 18-24, wherein, The method further includes: The network device receives capability information sent by the terminal device. The capability information is used to indicate whether the terminal device supports the radio link failure event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with each of the candidate cells are met.

26. A terminal device, comprising: include: The handover module is used to trigger conditional handover before the handover conditions associated with any one of the candidate cells are met, if the first event is satisfied. The first event is related to condition switching, or the first event is related to condition switching and the wireless link failure event predicted by the terminal device.

27. The terminal device of claim 26, wherein, The first event includes: At the first moment, the terminal device predicts that at the second moment after the first duration, the terminal device will trigger a radio link failure in the serving cell, and at the first moment, the terminal device predicts that the handover conditions associated with any of the candidate cells within the first duration will not be met; or In the first moment, the terminal device predicts that the time interval between the third moment and the fourth moment is less than or equal to the second duration, wherein the third moment is the earliest moment when the handover conditions associated with at least one candidate cell predicted by the terminal device are met, and the fourth moment is the moment when the terminal device predicts that the terminal device will trigger a radio link failure in the serving cell. Wherein, the first moment is the current moment of the terminal device.

28. The terminal device of claim 27, wherein, The terminal device also includes: A first receiving module is configured to receive first configuration information sent by a network device, the first configuration information being related to the first event, and the first configuration information including: The first parameter indicates the value of the first duration; or The second parameter indicates the value of the second duration; or The first parameter and the second parameter are used to indicate the value of the first duration and the second parameter is used to indicate the value of the second duration.

29. The terminal device according to claim 27 or 28, characterized by The conditional handover triggered by the terminal device before the handover conditions associated with any candidate cell are met includes: If the first condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the first condition, wherein the first condition is related to the measurement results of the candidate cell; or At the first moment, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the second condition is that the cell-level measurement result corresponding to the candidate cell is the best among the cell-level measurement results corresponding to all candidate cells; or If the third condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the first condition, or the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the third condition is that the cell-level measurement result of the serving cell is less than or equal to a first threshold; or If the fourth condition is met, the terminal device initiates a handover procedure to a candidate cell that meets the fourth condition, wherein the fourth condition is related to the measurement results of the candidate cell and the measurement results of the serving cell; or Upon reaching the fifth time point, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the time interval between the fifth time point and the first time point is a third duration; or Upon reaching the sixth time point, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the time interval between the sixth time point and the second time point is the fourth duration; or Upon reaching the seventh time, the terminal device initiates a handover procedure to a candidate cell that meets the second condition, wherein the seventh time is any time between the first time and the second time.

30. The terminal device of claim 29, wherein, The first condition includes any one of the following: The cell-level measurement results corresponding to the candidate cell meet the event type indicated in the handover conditions associated with the candidate cell, but the duration of the state corresponding to the cell-level measurement results corresponding to the candidate cell meeting the event type indicated in the handover conditions associated with the candidate cell up to the current time is less than the first duration threshold. or The cell-level measurement result corresponding to the candidate cell is greater than the second threshold.

31. The terminal device according to claim 29 or 30, characterized by The fourth condition includes any one of the following: The cell-level measurement results corresponding to the candidate cell meet the event type indicated in the handover conditions associated with the candidate cell, but the duration of the state corresponding to the cell-level measurement results corresponding to the candidate cell meeting the event type indicated in the handover conditions associated with the candidate cell up to the current time is less than the first duration threshold, and the cell-level measurement results of the serving cell are less than or equal to the first threshold. or The cell-level measurement result corresponding to the candidate cell is the best among all cell-level measurement results corresponding to the candidate cells, and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold. or The cell-level measurement result corresponding to the candidate cell is greater than the second threshold and the cell-level measurement result corresponding to the serving cell is less than or equal to the first threshold.

32. The terminal device of any one of claims 29-31, wherein, The terminal device also includes: The second receiving module is configured to receive second configuration information sent by the network device. The second configuration information is related to the behavior of the terminal device in triggering conditional handover before the handover conditions associated with each of the candidate cells are met. The second configuration information includes any one of the following: A third parameter, wherein the third parameter is used to indicate the value of the first threshold; or The fourth parameter, which indicates the value of the second threshold; or The third parameter and the fourth parameter, wherein the third parameter indicates the value of the first threshold, and the fourth parameter indicates the value of the second threshold; or The fifth parameter, which indicates the value of the third duration; or The sixth parameter is used to indicate the value of the fourth duration.

33. The terminal device of any one of claims 29-32, wherein, The terminal device also includes: The first sending module is configured to, at the first moment, if the terminal device predicts that no candidate cell meets the first condition at any time before the terminal device triggers a radio link failure event in the serving cell, send first information to the network device, wherein the first information is related to the radio link failure event predicted by the terminal device.

34. The terminal device of any one of claims 29-33, wherein, The terminal device also includes: The second sending module is configured to, at the first moment, if the terminal device predicts that no candidate cell meets the fourth condition at any time before the terminal device triggers a radio link failure event in the serving cell, send first information to the network device, wherein the first information is related to the radio link failure event predicted by the terminal device.

35. The terminal device of any one of claims 27-32, wherein, The terminal device also includes: The third sending module is used to send first information to the network device if the first event is satisfied, wherein the first information is related to the wireless link failure event predicted by the terminal device.

36. The terminal device of any one of claims 33-35, wherein, The first information includes second information and / or third information, wherein the second information is used to indicate that the terminal device predicts that it will trigger a radio link failure event in the serving cell at a future time, and the third information is used to indicate relevant information about the radio link failure event predicted by the terminal device.

37. The terminal device of claim 36, wherein, The third information includes one or more of the following: The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered. The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered; The cell-level measurement results of the serving cell actually measured by the terminal device at the first moment; The cell-level measurement results of the serving cell at the moment when the wireless link failure event predicted by the terminal device is triggered; The fourth information is used to indicate the length of the time interval between the time when the terminal device predicts the wireless link failure event and the time when it reports the first information. The first beam set is either the beam set used by the terminal device to perform the wireless link failure monitoring task or a beam set composed of reference beams indicated in the cell configuration corresponding to one or more candidate cells.

38. The terminal device of claim 26, wherein, The first event includes: At the first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after the first duration. Wherein, the first moment is the current moment of the terminal device.

39. The terminal device of claim 38, wherein, The conditional handover triggered by the terminal device before the handover conditions associated with any candidate cell are met includes: At the first moment, the terminal device initiates a handover procedure to a candidate cell that meets the fifth condition, wherein the fifth condition is a handover condition associated with the candidate cell that will be met after the first duration; or Upon reaching the eighth time, the terminal device initiates a handover procedure to a candidate cell that meets the sixth condition, wherein the eighth time is equal to the first time or is a time after the first time, and at the eighth time, the cell-level measurement result of the serving cell of the terminal device is less than or equal to the third threshold.

40. The terminal device of claim 39, wherein, The sixth condition includes any one of the following: The handover conditions associated with the candidate cell will be met within the first time period; or The handover conditions associated with the candidate cell will be met within the first time period, and the time when the handover conditions associated with the candidate cell are met is the shortest from the eighth time period.

41. The terminal device of any one of claims 38-40, wherein, The terminal device also includes: The third receiving module is configured to receive third configuration information sent by the network device. The third configuration information is related to the first event and / or the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The third configuration information includes any one of the following: The seventh parameter, which indicates the value of the first duration; or The seventh parameter and the eighth parameter, wherein the seventh parameter is used to indicate the value of the first duration and the eighth parameter is used to indicate the value of the third threshold.

42. The terminal device of any one of claims 26-41, wherein, The terminal device also includes: The fourth sending module is used to send capability information to the network device. The capability information is used to indicate whether the terminal device supports the wireless link failure event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

43. A network device, comprising: include: The sending module is configured to send configuration information to the terminal device, the configuration information being related to a first event and / or the behavior of triggering conditional handover before the handover condition associated with any one of the candidate cells in one or more candidate cells is met, wherein the first event is related to conditional handover, or the first event is related to conditional handover and a radio link failure event predicted by the terminal device.

44. The network device of claim 43, wherein, The configuration information includes first configuration information, which is related to the first event. The first configuration information includes: The first parameter, which indicates the value of the first duration; or The second parameter indicates the value of the second duration; or The first parameter and the second parameter, the first parameter is used to indicate the value of the first duration, and the second parameter is used to indicate the value of the second duration; The first event includes: In the first moment, it is predicted that the terminal device will trigger a radio link failure in the serving cell in the second moment after the first duration, and in the first moment, it is predicted that the handover conditions associated with any of the candidate cells within the first duration are not met; or The time interval between the first time point and the third time point is predicted to be less than or equal to the second duration, wherein the third time point is the earliest time when the handover conditions associated with at least one candidate cell predicted by the terminal device are met, and the fourth time point is the time when the terminal device predicts that the terminal device will trigger a radio link failure in the serving cell. Wherein, the first moment is the current moment of the terminal device.

45. The network device of claim 44, wherein, The configuration information also includes second configuration information, which is related to the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The second configuration information includes any one of the following: The third parameter is used to indicate the value of the first threshold. or The fourth parameter indicates the value of the second threshold. or The third parameter and the fourth parameter, wherein the third parameter is used to indicate the value of the first threshold and the fourth parameter is used to indicate the value of the second threshold; or The fifth parameter, which indicates the value of the third duration; or The sixth parameter is used to indicate the value of the fourth duration.

46. The network device of claim 44 or 45, wherein, The network device also includes: A first receiving module is configured to receive first information sent by the terminal device, the first information being related to a wireless link failure event predicted by the terminal device.

47. The network device of claim 46, wherein, The first information includes second information and / or third information, wherein the second information is used to indicate that the terminal device predicts that it will trigger a radio link failure event in the serving cell at a future time, and the third information is used to indicate relevant information about the radio link failure event predicted by the terminal device.

48. The network device of claim 47, wherein, The third information includes one or more of the following: The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the first moment, as actually measured by the terminal device; The beam identification information corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered. The beam measurement result corresponding to the beam with the best beam measurement result in the first beam set at the moment when the wireless link failure event predicted by the terminal device is triggered; The cell-level measurement results of the serving cell actually measured by the terminal device at the first moment; The cell-level measurement results of the serving cell at the moment when the wireless link failure event predicted by the terminal device is triggered; The fourth information is used to indicate the length of the time interval between the time when the terminal device predicts the wireless link failure event and the time when it reports the first information. The first beam set is either the beam set used by the terminal device to perform the wireless link failure monitoring task or a beam set composed of reference beams indicated in the cell configuration corresponding to one or more candidate cells.

49. The network device of claim 43, wherein, The configuration information includes third configuration information, which is related to the first event and / or the behavior of the terminal device triggering conditional handover before the handover conditions associated with any candidate cell are met. The third configuration information includes any one of the following: The seventh parameter, which indicates the value of the first duration; or The seventh parameter and the eighth parameter, wherein the seventh parameter is used to indicate the value of the first duration and the eighth parameter is used to indicate the value of the third threshold; The first event includes: At the first moment, the terminal device predicts that the handover conditions associated with at least one candidate cell will be met after the first duration. Wherein, the first moment is the current moment of the terminal device.

50. The network device of any of claims 43-49, wherein, The network device also includes: The second receiving module is used to receive capability information sent by the terminal device. The capability information is used to indicate whether the terminal device supports the wireless link failure event prediction function and / or to indicate whether the terminal device supports the function of triggering conditional handover before the handover conditions associated with any candidate cell are met.

51. A terminal device, comprising: It includes a memory and a processor, the memory being used to store a program, and the processor being used to invoke the program in the memory to cause the terminal device to perform the method as described in any one of claims 1-17.

52. A network device, comprising: The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or transmit signals so that the network device performs the method as described in any one of claims 18-25.

53. An apparatus comprising: Includes a processor for calling a program from memory to cause the apparatus to perform the method as described in any one of claims 1-17 or 18-25.

54. A chip, comprising: Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1-17 or 18-25.

55. A computer-readable storage medium, comprising: It contains a program that causes a computer to perform the method as described in any one of claims 1-17 or 18-25.

56. A computer program product, characterized in that, Includes a program that causes a computer to perform the method as described in any one of claims 1-17 or 18-25.

57. A computer program, characterized in that, The computer program causes the computer to perform the method as described in any one of claims 1-17 or 18-25.

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