Communication methods and related devices

Abstract

A communication method and related apparatus are disclosed, applicable to the field of communication technology. In this communication method, the network side can configure a first condition for the terminal. This first condition is a condition related to the continuous out-of-sync indication received by the terminal's RRC layer and without triggering an RLF event. When the first condition is met, the terminal can perform related operations to conduct a rapid RRC connection re-establishment process, reduce the probability of RLF events occurring, or increase the probability of successful Layer 1 or Layer 2 handover, thereby reducing the probability of RRC connection re-establishment and improving the user's service experience.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a communication method and related apparatus. Background Technology

[0002] After a radio link failure (RLF), the terminal can trigger a radio resource control (RRC) connection re-establishment process. For example, the basic RLF process includes: when the terminal is in RRC connected state, if the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, the terminal starts timer 310; if the terminal receives N311 consecutive synchronization indications during the execution of timer 310, timer 310 is stopped; if the terminal does not receive N311 consecutive synchronization indications during the execution of timer 310 or timer 310 times out, an RLF event is considered to have occurred, and the RRC connection re-establishment process needs to be triggered.

[0003] How to reduce the impact of RLF events on business continuity, and thus reduce the impact on users' business experience, is an issue that needs to be addressed.

[0004] Research has found that RLF events can affect business continuity, which in turn can impact the user experience. Summary of the Invention

[0005] This application provides a communication method and related apparatus that facilitates a rapid RRC connection re-establishment process or reduces the probability of RLF events, thereby improving the user's service experience.

[0006] In a first aspect, embodiments of this application provide a communication method, which can be executed by a terminal or by a device compatible with the terminal, such as a processor, chip, or chip module. Taking a terminal as an example, the method includes: the terminal receiving first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous loss-of-synchronization indication received by the terminal's RRC layer and not triggering a radio link failure event; the terminal satisfying the first condition sending a measurement report, the measurement report being used to indicate signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement.

[0007] In this method, the terminal can send a measurement report even when no wireless link failure event is triggered. This allows the network side to send the terminal's context information to potential target network devices (or candidate network devices) based on the measurement report. When a wireless link failure event occurs, there is no need to wait for the target network device to obtain the terminal's context information, thus enabling a rapid RRC connection re-establishment process, reducing latency and improving the user's service experience.

[0008] In this method, the terminal can send a measurement report even when no wireless link failure event is triggered. This allows the network side to select potential target network devices (or candidate network devices) based on the measurement report and prepare for Layer 1 or Layer 2 handover. This increases the probability of successful Layer 1 or Layer 2 handover, reduces the probability of RRC connection re-establishment, and improves the user's service experience.

[0009] For example, the terminal considers a wireless link failure event to have occurred, or the triggering condition for a wireless link failure event is that timer T310 times out. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications. The duration of timer T310 can be configured by the network side, predefined by the protocol, or determined through negotiation between the terminal and the network side; this application does not impose any limitations on this.

[0010] In one possible implementation, the first condition includes at least one of the following:

[0011] (1) The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to the first value N1, where N1 is greater than or equal to zero and less than N310.

[0012] (2) The first timer T1 times out. The first timer T1 is started when N2 consecutive out-of-synchronization indications are received at the RRC layer of the terminal, and stops when N3 consecutive synchronization indications are received during operation; wherein, N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311.

[0013] (3) The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when it receives N311 consecutive synchronization indications during its operation; wherein, T2 is greater than or equal to zero and less than the timing duration of timer T310. Or,

[0014] (4) During the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to the third value N4. Specifically, the first timer T1 starts when N2 consecutive out-of-synchronization indications are received at the terminal's RRC layer and stops when N3 consecutive synchronization indications are received during its operation; where N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311; and N4 is greater than or equal to zero and less than N3. Alternatively, N4 is greater than or equal to zero and less than N311.

[0015] Optionally, the first condition may be referred to as an event, which may be at least one of the above. The first condition and the parameters involved in at least one of the parameters included in the first condition, such as N1, N2, N3, N4, T2, etc., may be configured by the network side and the configuration information may be sent to the terminal via message signaling. Optionally, the message signaling may be one or more of the following: RRC signaling, media access control control element (MAC CE) signaling, or downlink control information (DCI).

[0016] Based on this method, the terminal can trigger the reporting of a measurement report when the first condition is met and no wireless link failure event is triggered. This is beneficial for network devices to send the terminal's context information to candidate network devices as early as possible, enabling a fast RRC connection re-establishment process.

[0017] Based on this method, the terminal can trigger the reporting of a measurement report when the first condition is met and no wireless link failure event is triggered. This is beneficial for triggering the source network device to prepare for Layer 1 or Layer 2 handover, increasing the probability of successful Layer 1 or Layer 2 handover, reducing the probability of RRC connection re-establishment, and improving the user's service experience through handover.

[0018] In one possible implementation, the measurement report includes information on at least one of the following among the neighboring cells measured by the terminal: the N5 cells with the best signal quality; cells with signal quality greater than or equal to a fourth value H1; or, the cell with the best signal quality. Wherein, N5 is a positive integer. And / or, the measurement report includes signal quality information of the serving cell measured by the terminal.

[0019] Based on this method, the measurement report includes signal quality information of neighboring cells and / or serving cells, which helps network devices determine the context information of potential target network devices sending terminals, reducing the time required for RRC connection re-establishment, or selecting potential target network devices for Layer 1 or Layer 2 handover preparation, reducing the handover time required for Layer 1 or Layer 2.

[0020] In one possible implementation, the method further includes: when the terminal triggers a wireless link failure event, it performs a wireless resource control connection re-establishment process.

[0021] Based on this method, when a terminal triggers a wireless link failure event, since the potential target network device has already obtained the terminal's context information, a fast RRC connection re-establishment process can be performed.

[0022] In one possible implementation, the method further includes: when the terminal triggers a wireless link failure event, performing a layer 1 or layer 2 handover process.

[0023] Based on this method, the terminal reports a measurement report before triggering a wireless link failure event, triggering the source network device to prepare for Layer 1 or Layer 2 handover. Therefore, when a wireless link failure event is triggered, Layer 1 or Layer 2 handover can be performed quickly, reducing the time required for the Layer 1 or Layer 2 handover process and improving the user experience.

[0024] In one possible implementation, the terminal also receives Layer 1 or Layer 2 handover configuration information, which is used to indicate the configuration information of one or more candidate cells.

[0025] Based on this method, the terminal reports a measurement report, which enables the network side to select one or more candidate cells for handover preparation. After successful handover preparation, the configuration information of the selected one or more candidate cells can be sent to the terminal in a timely manner. This allows the terminal to quickly switch to the candidate cell based on the configuration information of the candidate cell indicated by the handover configuration information when a radio link failure event is triggered, further reducing the handover process time.

[0026] In one possible implementation, when a radio link failure event is triggered and the target cell selected during the cell selection process is a candidate cell indicated by the layer 1 or layer 2 handover configuration information, the terminal performs a layer 1 or layer 2 handover process; when a radio link failure event is triggered and the target cell selected during the cell selection process is not a candidate cell indicated by the layer 1 or layer 2 handover configuration information, the terminal performs an RRC connection re-establishment process.

[0027] Based on this method, the terminal, in conjunction with the selected cell, performs either a Layer 1 or Layer 2 handover process, or an RRC connection re-establishment process, thereby further reducing the time required for link recovery after a wireless link failure.

[0028] Secondly, embodiments of this application provide a communication method, which can be executed by a network device or by a device compatible with the network device, such as a processor, chip, or chip module. Taking a network device as an example, the method includes: the network device determining first information, the first information being used to configure a first condition for triggering a terminal to report a measurement report, the first condition being a condition related to a continuous loss of synchronization indication received by the terminal's RRC layer and not triggering a wireless link failure event; and the network device sending the first information.

[0029] In this method, the network device configures the first condition to the terminal, which helps the terminal send a measurement report to its network device before triggering a wireless link failure event.

[0030] This method allows network devices to select potential target network devices (or candidate network devices) based on the measurement report and send terminal context information. When a wireless link failure event occurs and the terminal initiates RRC connection re-establishment, it can perform a fast RRC connection re-establishment process without waiting to obtain terminal context information, thus improving the user's service experience.

[0031] This method allows network devices to select potential target network devices based on the measurement report and prepare for Layer 1 or Layer 2 handover, thereby increasing the probability of successful Layer 1 or Layer 2 handover and reducing the probability of RRC connection re-establishment. Furthermore, in the event of a wireless link failure, the terminal can perform a rapid Layer 1 or Layer 2 handover, improving the user's service experience.

[0032] In one possible implementation, the network device receives a measurement report, which indicates the signal quality information of neighboring cells and / or serving cells obtained by the terminal measurement; the network device selects one or more candidate cells based on the measurement report; and the network device sends the terminal's context information to the candidate network devices to which one or more candidate cells belong.

[0033] Based on this method, the network device sends the terminal's context information to one or more candidate network devices belonging to the candidate cells. This is beneficial because when the terminal triggers a radio link failure event and selects a candidate cell for RRC connection re-establishment, it no longer needs to wait for the candidate network device to obtain the terminal's context information, thereby shortening the time required for RRC connection re-establishment and improving the user's service experience.

[0034] In another possible implementation, the network device receives a measurement report, which indicates the signal quality information of neighboring cells and / or serving cells obtained by the terminal measurement; based on the measurement report, the network device selects one or more candidate cells and performs a preparation process for Layer 1 or Layer 2 handover with the candidate network devices to which one or more candidate cells belong.

[0035] Based on this method, network devices can prepare for Layer 1 or Layer 2 handover before a wireless link failure event, which helps to increase the probability of Layer 1 or Layer 2 handover and reduce the probability of RRC connection re-establishment. When a wireless link failure event is triggered, a fast Layer 1 or Layer 2 handover process can be performed, reducing the time taken for the Layer 1 or Layer 2 handover process and improving the user's service experience.

[0036] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications, and stops when N3 consecutive synchronization indications are received during operation; the runtime of timer T310 is greater than or equal to a second value T2, timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when N311 consecutive synchronization indications are received during operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0037] For a detailed description of this implementation method, please refer to the relevant content in the first aspect, which will not be elaborated here.

[0038] In one possible implementation, the measurement report includes information on at least one of the following among the neighboring cells measured by the terminal: the N5 cells with the best signal quality; cells with signal quality greater than or equal to a fourth value H1; or, the cell with the best signal quality. Wherein, N5 is a positive integer. And / or, the measurement report includes service quality information of the serving cell obtained by the terminal measurement.

[0039] For a detailed description of this implementation method, please refer to the relevant content in the first aspect, which will not be elaborated here.

[0040] Thirdly, embodiments of this application provide a communication method, which can be executed by a terminal or by a device matched with the terminal, such as a processor, chip, or chip module. Taking a terminal as an example, the terminal receives first information, which is used to configure a first condition. The first condition is a condition related to the continuous out-of-synchronization indication received by the terminal's RRC layer and which does not trigger a radio link failure event. If the terminal meets the first condition, it performs an early uplink synchronization process in a candidate cell. The early uplink synchronization process refers to the terminal initiating a random access procedure to obtain a TA (time advance) value and / or terminal identifier from the network device side. Early uplink synchronization is performed before the terminal accesses the target cell.

[0041] In this method, the terminal performs an Early UL-Sync process in the candidate cell based on a first condition configured on the network side. When the first condition is met, the terminal performs the Early UL-Sync process in the candidate cell. This means that the terminal can perform the Early UL-Sync process in the candidate cell before a radio link failure event is triggered, reducing the probability of interruption in data packet transmission during Layer 1 or Layer 2 handover due to a radio link failure event, thus improving the user's service experience.

[0042] In one possible implementation, the candidate cell is a candidate cell configured with Layer 1 or Layer 2 handover configuration information to perform an early uplink synchronization process.

[0043] Based on this method, the terminal reports a radio resource management (RRM) measurement report. The network side selects the target network device based on the RRM measurement report and prepares for Layer 1 or Layer 2 handover. When the Layer 1 or Layer 2 handover preparation is successful, the network side sends the Layer 1 or Layer 2 handover configuration information to the terminal.

[0044] For example, the Layer 1 or Layer 2 handover configuration information includes one or more of the following: candidate cell identifier, candidate cell synchronization signal block (SSB) configuration, candidate cell RRC reconfiguration, and Early UL-SyncConfig. For example, Early UL-SyncConfig includes random access resources for the terminal to perform Early UL-Sync in the candidate cell; for example, random access resources may include one or more of the following: frequency, random access time-frequency domain timing resources, maximum number of preamble transmissions, or receive window. This application embodiment does not limit the specific form of the random access resources.

[0045] In one possible implementation, the first information is used to configure the first condition corresponding to each candidate cell. When the terminal meets the first condition, an early uplink synchronization process is performed in the candidate cell, including: the terminal performs an early uplink synchronization process in the candidate cell that meets the corresponding first condition.

[0046] Optionally, the conditions for triggering terminals to perform early uplink synchronization may be different or the same for different candidate cells.

[0047] Based on this method, each candidate cell is independently configured with a corresponding first condition. If the terminal meets the first condition of a candidate cell, it can perform an early uplink synchronization process in that candidate cell.

[0048] In another possible implementation, the first information is used to configure a first condition for multiple candidate cells. When the terminal meets the first condition, an early uplink synchronization process is performed in the candidate cells, including: when the terminal meets the first condition, it selects one or more candidate cells from multiple candidate cells and performs an early uplink synchronization process.

[0049] Based on this method, all candidate cells can be configured with a unified first condition for performing the early uplink synchronization process. For example, the network side can configure the first condition for the terminal. When the first condition is met, the terminal can select a candidate cell to perform the early uplink synchronization process.

[0050] In one possible design, when the first condition is met, the terminal can select a candidate cell from multiple candidate cells that also meets the second condition to perform an early uplink synchronization process. The second condition is related to the signal quality of the candidate cell. For example, the second condition includes at least one of the following: the signal quality of the candidate cell is higher than or equal to a signal quality threshold H2; or, the signal quality of the candidate cell is higher than or equal to the sum of the signal quality of the source cell and a threshold H3 (i.e., the signal quality of the candidate cell is higher than or equal to the signal quality of the source cell plus a threshold H3). Optionally, the signal quality threshold H2 and the threshold H3 for the difference in signal quality between the candidate cell and the source cell can be configured by the network side, predefined, or determined through negotiation between the network side and the terminal side; this application does not limit this.

[0051] This method not only configures a first condition to consider the occurrence of wireless link failure, but also configures a second condition to consider the signal quality of the candidate cell, thereby enabling the terminal to access the candidate cell with better signal quality as soon as possible.

[0052] In another possible design, when the first condition is met, the terminal can select N6 cells with the best signal quality from the candidate cells and perform an early uplink synchronization process. Here, N6 is a positive integer, which can be configured by the network side, predefined, or determined through negotiation between the network side and the terminal side; this application does not impose any restrictions on this.

[0053] In this design, the terminal selects the N6 cells with the best signal quality for the early uplink synchronization process, which is beneficial for the terminal to switch to the target cell with better signal quality.

[0054] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications, and stops when N3 consecutive synchronization indications are received during operation; the runtime of timer T310 is greater than or equal to a second value T2, timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when N311 consecutive synchronization indications are received during operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0055] For a detailed explanation of the first condition, please refer to the relevant content described in the first aspect, which will not be elaborated here.

[0056] Fourthly, embodiments of this application provide a communication method, which can be executed by a network device or by a device matched with the network device, such as a processor, chip, or chip module. Taking a network device as an example, the network device determines first information, which is used to configure a first condition for triggering the terminal to perform an early uplink synchronization process. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event; the network device sends the first information.

[0057] In this method, the network device configures the first condition to the terminal, which helps the terminal to perform the early uplink synchronization process in the candidate cell before the radio link failure event is triggered. This reduces the probability of interruption of data packet transmission during Layer 1 or Layer 2 handover due to the occurrence of a radio link failure event, thereby improving the user's service experience.

[0058] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications, and stops when N3 consecutive synchronization indications are received during operation; the runtime of timer T310 is greater than or equal to a second value T2, timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when N311 consecutive synchronization indications are received during operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0059] For a detailed explanation of the first condition, please refer to the relevant content described in the first aspect, which will not be elaborated here.

[0060] Fifthly, embodiments of this application provide a communication method, which can be executed by a terminal or by a device matched with the terminal, such as a processor, chip, or chip module. Taking a terminal as an example, the terminal receives first information, which is used to configure a first condition. The first condition is a condition related to a continuous out-of-synchronization indication received by the terminal's RRC layer and is a starting point radio link failure event. When the terminal meets the first condition, it accesses a candidate cell.

[0061] In this method, the terminal can access the candidate cell if the first condition is met before a radio link failure event is triggered. This reduces the probability of a radio link failure event and improves the user's service experience.

[0062] In one possible implementation, the candidate cell is a candidate cell for conditional handover configured by the network device.

[0063] For example, the source network device prepares for handover with a potential target network device. The source network device configures candidate cells for conditional handover, execution conditions for conditional handover, and access resources for handover execution for the terminal. For instance, the execution condition for conditional handover is that the terminal measures the signal quality of the candidate cell to meet a certain event, such as the A3 event. Based on this method, the terminal can perform conditional handover in advance and access the candidate cell when the first condition is met, reducing the probability of radio link failure events and thus improving the user's service experience.

[0064] In one possible implementation, when the terminal meets the first condition and the cell with the best signal quality measured by the terminal is the candidate cell, the step of accessing the candidate cell is performed.

[0065] In this implementation, the cell that meets the first condition and has the best signal quality measured by the terminal is the candidate cell. Accessing the candidate cell further reduces the probability of wireless link failure events and improves the user's service experience.

[0066] In one possible implementation, the terminal receives second information, which instructs the terminal to perform a condition switch when the first condition is met.

[0067] Based on this method, the network device can instruct the terminal to perform condition switching when the first condition is met, thereby reducing the probability of wireless link failure events and improving the user's service experience.

[0068] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications, and stops when N3 consecutive synchronization indications are received during operation; the runtime of timer T310 is greater than or equal to a second value T2, timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when N311 consecutive synchronization indications are received during operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0069] For a detailed explanation of the first condition, please refer to the relevant content described in the first aspect, which will not be elaborated here.

[0070] Sixthly, embodiments of this application provide a communication method, which can be executed by a network device or by a device matched with the network device, such as a processor, chip, or chip module. Taking a network device as an example, the network device determines first information, which is used to configure a first condition for triggering a conditional switch of the terminal. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event; the network device sends the first information.

[0071] In this method, the network device configures the terminal to access the candidate cell when the first condition is met before a wireless link failure event is triggered. This reduces the probability of the terminal experiencing a wireless link failure event and improves the user's service experience.

[0072] In one possible implementation, the candidate cell is a candidate cell for conditional handover configured by the network device.

[0073] For example, the source network device prepares for handover with a potential target network device. The source network device configures candidate cells for conditional handover, execution conditions for conditional handover, and access resources for handover execution for the terminal. For instance, the execution condition for conditional handover is that the terminal measures the signal quality of the candidate cells and it meets a certain event, such as the A3 event.

[0074] Based on this method, the terminal can perform condition switching in advance when the first condition is met, access the candidate cell, reduce the probability of wireless link failure events, and thus improve the user's service experience.

[0075] In one possible implementation, the network device sends a second message instructing the terminal to perform a condition switch when the first condition is met.

[0076] Based on this method, the network device dynamically instructs the terminal to perform condition switching when the first condition is met.

[0077] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications, and stops when N3 consecutive synchronization indications are received during operation; the runtime of timer T310 is greater than or equal to a second value T2, timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when N311 consecutive synchronization indications are received during operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0078] For a detailed explanation of the first condition, please refer to the relevant content described in the first aspect, which will not be elaborated here.

[0079] In addition, the configuration methods of the first condition and the parameters involved in the first, third and fifth aspects can be different or the same, and can be configured jointly or relatively independently.

[0080] For example, the specific values ​​of the parameters involved in the first condition for triggering the terminal to send a measurement report in the first aspect, such as N1, N2, N3, N4, and T2, are configured relatively independently from the specific values ​​of the parameters involved in the first condition for triggering the terminal to perform an early uplink synchronization process in the third aspect. Similarly, the specific values ​​of the parameters involved in the first condition for triggering the terminal to perform a conditional handover and access a candidate cell in the fifth aspect are also configured relatively independently.

[0081] In a seventh aspect, embodiments of this application provide a communication device, which includes units or modules for performing the methods described in the first, third, or fifth aspects, or other optional implementations.

[0082] Eighthly, embodiments of this application provide a communication device that includes units or modules for performing the methods described in the second, fourth, or sixth aspects, or other optional implementations.

[0083] Ninthly, embodiments of this application provide a communication device, including a processor, a memory, and a computer program or instructions stored in the memory. The processor executes the computer program or instructions to cause the communication device to implement the steps of the methods involved in the first aspect, the third aspect, the fifth aspect, or optional implementations thereof, or to implement the steps of the methods involved in the second aspect, the fourth aspect, the sixth aspect, or optional implementations thereof.

[0084] In a tenth aspect, embodiments of this application provide a chip module, including a communication interface and a chip. The communication interface is used for internal communication within the chip module or for communication between the chip module and an external device. The chip is used to execute the steps of the methods involved in the first aspect, the third aspect, the fifth aspect, or optional implementations thereof, or to implement the steps of the methods involved in the second aspect, the fourth aspect, the sixth aspect, or optional implementations thereof.

[0085] Eleventhly, embodiments of this application provide a computer-readable storage medium storing a computer program or instructions that, when executed, implement the steps of the methods involved in the first, third, or fifth aspects or their optional implementations, or implement the steps of the methods involved in the second, fourth, or sixth aspects or their optional implementations.

[0086] In a twelfth aspect, embodiments of this application provide a computer program product, including a computer program or instructions, wherein when the computer program or instructions are executed, they implement the steps of the methods involved in the first aspect, the third aspect, the fifth aspect, or their optional implementations, or implement the steps of the methods involved in the second aspect, the fourth aspect, the sixth aspect, or their optional implementations.

[0087] In a thirteenth aspect, embodiments of this application provide a communication system, including a terminal and a network device. The terminal is used to perform the steps of the methods involved in the first, third, or fifth aspects or their optional implementations described above, and the network device is used to perform the steps of the methods involved in the second, fourth, or sixth aspects or their optional implementations described above. Attached Figure Description

[0088] Figure 1 This is a schematic diagram of a layer 1 / layer 2 switching process;

[0089] Figure 2 This is a schematic diagram of a condition switching process;

[0090] Figure 3 It is a schematic diagram of the structure of a communication system;

[0091] Figure 4 This is a flowchart illustrating the communication method 100 provided in an embodiment of this application;

[0092] Figure 5 This is a flowchart illustrating the communication method 200 provided in an embodiment of this application;

[0093] Figure 6 This is a flowchart illustrating the communication method 300 provided in an embodiment of this application;

[0094] Figure 7 This is a flowchart illustrating the communication method 400 provided in an embodiment of this application;

[0095] Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0096] Figure 9 This is a schematic diagram of another communication device provided in an embodiment of this application;

[0097] Figure 10 This is a schematic diagram of the structure of a chip module provided in an embodiment of this application. Detailed Implementation

[0098] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function and purpose. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, nor do they imply that they must be different. "And / or" describes 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. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0099] It should be understood that in this application, "at least one" refers to one or more; "multiple" refers to two or more. Furthermore, the word "equal to" in this application can be used in conjunction with "greater than" or "less than". When "equal to" and "greater than" are used together, the technical solution using "greater than" is adopted; when "equal to" and "less than" are used together, the technical solution using "less than" is adopted.

[0100] I. This application describes the relevant concepts involved in the embodiments.

[0101] 1. Terminal equipment

[0102] The terminal device in this application embodiment is a device with wireless communication capabilities, and may be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal device, vehicle-mounted terminal device, industrial control terminal device, UE unit, UE station, mobile station, remote station, remote terminal device, mobile device, UE terminal device, wireless communication device, UE agent, or UE device, etc. The terminal device can be fixed or mobile. It should be noted that the terminal device can support at least one wireless communication technology, such as LTE, New Radio (NR), etc. For example, terminal devices can be mobile phones, tablets, desktop computers, laptops, all-in-one computers, in-vehicle terminals, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, wearable devices, terminal devices in future mobile communication networks, or terminal devices in future evolved public land mobile networks (PLMNs), etc. In some embodiments of this application, the terminal device may also be a device with transceiver functions, such as a chip system. The chip system may include a chip, and may also include other discrete components.

[0103] 2. Access network equipment

[0104] In this application embodiment, the access network device is a device that provides wireless communication functions for terminal devices, and can also be referred to as a radio access network (RAN) device or access network element. The access network device can support at least one wireless communication technology, such as Long Term Evolution (LTE) or New Radio (NR). For example, the access network device includes, but is not limited to: next-generation node B (gNB), evolved node B (eNB), radio network controller (RNC), node B (NB), basestation controller (BSC), base transceiver station (BTS), home evolved node B (HNB), baseband unit (BBU), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, etc., in a 5th-generation (5G) mobile communication system. The equipment providing base station functionality in NR includes next-generation node basestations (gNBs) and evolved node Bs (ng-eNBs). The gNBs communicate with terminal devices using NR technology, while the ng-eNBs communicate with terminal devices using evolved universal terrestrial radio access (E-UTRA) technology. Both gNBs and ng-eNBs can connect to the 5G core network. Access network equipment can also be radio controllers, centralized units (CUs), and / or distributed units (DUs) in cloud radio access network (CRAN) scenarios. Alternatively, access network equipment can be relay stations, access points, vehicle-mounted equipment, terminal devices, wearable devices, and access network equipment in future mobile communications or future evolved PLMNs. In some embodiments, access network equipment can also be devices that provide wireless communication functionality to terminal devices, such as a chip system. For example, a chip system may include chips, and may also include other discrete components.

[0105] In some embodiments, the access network device can also communicate with Internet Protocol (IP) networks, such as the Internet, private IP networks, or other data networks.

[0106] 3. Core Network

[0107] The core network in this application embodiment is composed of core network elements. These core network elements, also known as core network equipment, are network elements deployed within the core network, such as core network control plane elements or core network user plane elements. The core network in this application embodiment can be an evolved packet core (EPC), a 5G core network, or a new type of core network in future communication systems. For example, a 5G core network consists of a set of network elements that implement access and mobility management functions (AMF), user plane functions (UPF) providing packet routing and QoS (quality of service) management, and session management functions (SMF) providing session management, IP address allocation and management. The EPC can consist of a mobility management entity (MME) providing mobility management and gateway selection, a serving gateway (S-GW) providing packet forwarding, and a packet data gateway (PDNgateway (P-GW) providing terminal address allocation and rate control. For multicast broadcast service (MBS), the core network can include several new network elements to implement functions such as packet forwarding, MBS conference management, QoS management, and transmission mode switching (switching between unicast and multicast / broadcast transmission modes). Alternatively, these functions can be implemented by existing core network elements.

[0108] 4. Switching Process

[0109] 4.1. Basic process of switching between Layer 1 and Layer 2

[0110] Figure 1 This is a schematic diagram of a Layer 1 / Layer 2 switching process. The possible steps of this switching process are as follows:

[0111] 101. The terminal reports a Layer 1 or Layer 2 measurement report to the source base station.

[0112] Among them, the measurement reports of layer 1 or layer 2 may be event-triggered measurement reports or measurement reports periodically reported by the terminal.

[0113] 102. The source base station determines that the terminal needs to perform a handover.

[0114] For example, the source base station determines that the terminal needs to perform a handover based on measurement reports and / or measurement reports related to radio resource management (RRM).

[0115] 103. The source base station sends a handover request message to the potential target base station. The handover request message is used to request that the terminal be handed over to the potential target base station.

[0116] Among them, potential target base stations, also known as candidate base stations, can be selected based on measurement reports and / or RRM-related measurement reports. Taking potential target base station 1 and potential target base station 2 as examples.

[0117] 104. The potential target base station returns a handover request confirmation message, which is used to inform the source base station and the potential target base station that they agree to hand over the terminal to the potential target base station.

[0118] The handover request confirmation message may also include resource configuration information for the terminal to perform random access in the cell of the potential target base station.

[0119] 105. The source base station sends a radio resource control (RRC) reconfiguration message to the terminal.

[0120] The RRC Reconfiguration message includes the cell identifier of the handover candidate, the terminal's configuration in the cell, and / or the resource configuration information for the terminal's random access in the cell.

[0121] 106. The terminal sends an RRC reconfiguration complete message to the source base station.

[0122] 107. The terminal performs uplink and / or downlink synchronization in the candidate cell.

[0123] 108. The terminal reports an L1 measurement report or an L2 measurement report to the source base station.

[0124] 109. The source base station sends an LTM cell switch command to the terminal, instructing the terminal to perform a cell switch.

[0125] 110. The terminal accesses the target cell and sends a Radio Resource Control Reconfiguration Complete (RRCReconfigurationComplete) message to the target base station.

[0126] It can be seen that, in Figure 1 In the handover process, after the terminal performs uplink and / or downlink synchronization in the candidate cell, it reports an L1 measurement report or an L2 measurement report. The network side can then instruct the terminal to perform cell handover based on the L1 measurement report or the L2 measurement report.

[0127] 4.2. Condition Switching Process

[0128] Figure 2 This is a schematic diagram of a condition switching process, and the possible steps of this condition switching process are as follows:

[0129] 201. The source base station sends the measurement configuration to the terminal.

[0130] 202. The terminal reports the measurement report to the source base station.

[0131] 203. The source base station determines that the terminal needs to perform a conditional switch.

[0132] For example, the source base station determines that the terminal needs to perform a conditional handover based on the measurement report and / or the RRM-related measurement report.

[0133] 204. The source base station sends a handover request message to the potential target base station. The handover request message is used to request that the terminal be handed over to the potential target base station.

[0134] 205. The potential target base station returns a handover request confirmation message, which is used to inform the source base station and the potential target base station that they agree to hand over the terminal to the potential target base station.

[0135] For a detailed explanation of steps 201 to 205, please refer to [link / reference]. Figure 1 The details of the basic handover process will not be elaborated here.

[0136] 206. The source base station sends a Radio Resource Control Reconfiguration (RRC Reconfiguration) message to the terminal.

[0137] The RRC Reconfiguration message contains candidate target cells for conditional handover and the execution conditions for the handover. The RRC Reconfiguration message may contain multiple candidate target cells and their corresponding execution conditions for the handover.

[0138] 207. The terminal sends a Radio Resource Control Reconfiguration Complete (RRC Reconfiguration Complete) message to the source base station.

[0139] 208. The terminal evaluates the execution conditions for handover of multiple candidate target cells. If at least one candidate target cell meets the corresponding execution conditions for handover, then the handover to the target cell is executed.

[0140] 209. The terminal leaves the source cell, synchronizes to the target cell, and performs a random access process in the target cell.

[0141] 210. The terminal sends an RRC ReconfigurationComplete message to the target base station (for example, assuming the target base station is potential target base station 1).

[0142] It can be seen that, in Figure 2 In the aforementioned conditional handover, the network side can configure multiple candidate target cells for the execution conditions of conditional handover for the terminal. The terminal can evaluate the target cell that meets the corresponding conditional handover execution conditions, and then leave the source cell and hand over to the target cell.

[0143] 5. Basic process of radio link failure (RLF)

[0144] 5.1. Triggering RLF events

[0145] When the terminal is in RRC connected state, if the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, the terminal starts timer T310. If N311 consecutive synchronization indications are received during the execution of timer T310, timer T310 is stopped. If timer T310 times out, an RLF event is considered to have been triggered.

[0146] After a terminal triggers an RLF event, the following two scenarios may occur:

[0147] Scenario 1: If access layer security is not activated, the terminal will switch to RRC idle state.

[0148] Scenario 2: If access layer security is activated, the terminal will initiate the RRC connection re-establishment process.

[0149] 5.2. RRC Connection Re-establishment Process

[0150] After the terminal triggers an RLF event, it selects a target cell and initiates an RRC connection re-establishment process. The terminal sends an RRC ReestablishmentRequest message to the target cell, and the target base station of the target cell obtains the terminal's context information from the source base station of the source cell where the RLF occurred, thus completing the RRC connection re-establishment process.

[0151] II. System Architecture Involved in the Embodiments of this Application

[0152] The embodiments of this application can be applied to fourth-generation (4G) systems; or to fifth-generation (5G) systems, also known as NR systems; or to sixth-generation (6G) systems, or seventh-generation (7G) systems, or other future communication systems; or they can also be used in device-to-device (D2D) systems, machine-to-machine (M2M) systems, vehicle-to-everything (V2X) systems, etc. The embodiments of this application can be applied to other network architectures, including but not limited to terrestrial communication network architectures, non-terrestrial communication network architectures, relay network architectures, dual-link architectures, and vehicle-to-everything communication architectures.

[0153] For example, Figure 3 This is a schematic diagram of the structure of a communication system. Figure 3 Taking three terminals, three access network devices, and one core network device as an example, this application is not limited to the number and form of each device. For instance, the interface between the terminals and the access network devices is an air interface; one terminal can connect to one or more access network devices, and one access network device can connect to and manage multiple terminals. There are interfaces between access network devices, which can be X2 interfaces (such as in 4G systems), Xn interfaces (such as in 5G systems), etc. There are interfaces between the access network devices and the core network device, which can be S1 interfaces (such as in 4G systems), NG interfaces (such as in 5G systems), etc.

[0154] In a network architecture, such as Figure 3 Terminals can access access network devices through relay devices. In one network architecture, there is an interface between terminals, which can be a short-range communication interface such as PC5 or Wireless Fidelity (WiFi).

[0155] It is understood that the system architecture described in the embodiments of this application is for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. Those skilled in the art will know that with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0156] In the communication method provided in this application, the network side can configure a first condition for the terminal. The first condition is a condition related to the continuous out-of-sync indication received by the terminal's RRC layer and without triggering an RLF event. When the first condition is met, the terminal performs corresponding operations to perform a fast RRC connection re-establishment process or reduce the probability of RLF events to improve the user's service experience.

[0157] In a communication method 100, when a first condition is met, the terminal reports a measurement report. Based on the measurement report, the network side can send the terminal's context information to potential target network devices. In this way, when a wireless link failure event occurs, the terminal does not need to wait for the target network device to obtain the terminal's context information, and a fast RRC connection re-establishment process can be performed, reducing latency and improving the user's service experience.

[0158] In a communication method 200, a terminal reports a measurement report when a first condition is met. Based on this measurement report, the network side can select potential target network devices and initiate a Layer 1 or Layer 2 handover preparation process. This method increases the probability of successful Layer 1 or Layer 2 handover, reduces the probability of RRC connection re-establishment, and improves the user's service experience.

[0159] In a communication method 300, when a terminal meets a first condition, it performs an early uplink synchronization process in a candidate cell. This method performs early uplink synchronization in the candidate cell before the RLF event is triggered, reducing the probability of interruption of data packet transmission during Layer 1 or Layer 2 handover due to radio link failure events, thereby improving the user's service experience.

[0160] In a communication method 400, a terminal accesses a candidate cell when a first condition is met. The candidate cell is a conditional handover candidate cell configured by the network device. This method, through RLF-related measurements, allows conditional handover to be performed and access to the candidate cell to be established when the first condition is met. This reduces the probability of RLF events occurring at the terminal and improves the user's service experience.

[0161] Furthermore, in communication methods 100 to 400, the configuration methods of the first condition and its related parameters can be different or the same, and can be configured jointly or relatively independently. For example, the specific values ​​of the parameters involved in the first condition for triggering the terminal to send a measurement report, such as N1, N2, N3, N4, and T2, are relatively independently configured compared to the specific values ​​of the parameters involved in the first condition for triggering the terminal to perform an early uplink synchronization process. Similarly, the specific values ​​of the parameters involved in the first condition for triggering the terminal to perform a conditional handover in advance and access a candidate cell, such as N1, N2, N3, N4, and T2, are also relatively independently configured.

[0162] The following will be explained in detail with reference to the accompanying drawings.

[0163] Figure 4 This is a flowchart illustrating a communication method 100 provided in an embodiment of this application. The communication method 100 is illustrated using the interaction between a terminal and a network device as an example. The network device is the network device belonging to the serving cell. The method includes, but is not limited to, the following steps:

[0164] S401. The terminal meets the first condition and sends a measurement report; correspondingly, the network device receives the measurement report, which is used to indicate the signal quality information of neighboring cells and / or serving cells obtained by the terminal measurement.

[0165] In an optional implementation, the method further includes: the network device determining and sending first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous out-of-sync indication received by the terminal's RRC layer and not triggering an RLF event; correspondingly, the terminal receiving the first information.

[0166] Optionally, the first information can be RRC signaling, MAC CE signaling, or DCI, etc.

[0167] Triggering an RLF event: When the terminal is in RRC connected state, the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer and starts timer T310; if N311 consecutive synchronization indications are received during the operation of timer T310, then timer T310 is stopped; if timer T310 times out, it is considered that an RLF event has been triggered.

[0168] In one alternative implementation, the first condition includes, but is not limited to, at least one of the following:

[0169] (1) The number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310. N310 is the number of consecutive out-of-synchronization indications received by the RRC layer that is triggered by timer T310, which is used to trigger the RLF event. For example, when the terminal determines that the number of consecutive out-of-synchronization indications received by the RRC layer is greater than or equal to the first value N1, it can send a measurement report to the network device.

[0170] (2) The first timer T1 times out. The first timer T1 is started when the terminal receives N2 consecutive out-of-synchronization indications at the RRC layer, and stops when it receives N3 consecutive synchronization indications during operation; where N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311, and N311 is the number of consecutive synchronization indications received that trigger the timer T310 to stop running. For example, the terminal starts the first timer T1 when it receives N2 consecutive out-of-synchronization indications at the RRC layer, and stops the first timer T1 if it receives N3 consecutive synchronization indications during operation. If the first timer T1 times out, a measurement report is sent to the network device.

[0171] (3) The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when it receives N311 consecutive synchronization indications during operation; wherein, T2 is greater than or equal to zero and less than the timing duration of timer T310. For example, if the terminal's RRC layer starts timer T310 when it receives N310 consecutive out-of-synchronization indications from the terminal's physical layer, and stops when it receives N311 consecutive synchronization indications during operation, and if the runtime of timer T310 is greater than or equal to the second value T2, a measurement report is sent to the network device, but the operation of timer T310 is not stopped.

[0172] (4) During the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to the third value N4. The first timer T1 starts when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during its operation; where N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311; and N4 is greater than or equal to zero and less than N3. Alternatively, N4 is greater than or equal to zero and less than N311. For example, if the terminal receives a measurement report to the network device when the number of consecutive synchronization indications received is less than or equal to the third value N4 during the operation of the first timer T1, the terminal sends a measurement report to the network device. Alternatively, if the terminal receives a measurement report to the network device when the number of consecutive synchronization indications received is less than or equal to the third value N4 during the operation of timer T310, the terminal sends a measurement report to the network device.

[0173] For example, the terminal may send a measurement report to the network device only if at least two of the first conditions (1) to (4) are met. For example, the terminal's RRC layer receives a number of consecutive out-of-step indications that are greater than or equal to the first value N1, and the first timer T1 times out, and then sends a measurement report to the network device.

[0174] For example, the terminal may send a measurement report to the network device only if at least three of the first conditions (1) to (4) are met. For example, the terminal's RRC layer receives a number of consecutive out-of-step indications that are greater than or equal to the first value N1, and the first timer T1 times out, and the runtime of timer T310 is greater than or equal to the second value T2, and then sends a measurement report to the network device.

[0175] For example, the terminal must meet conditions (1) to (4) in the first condition before sending a measurement report to the network device. For example, the terminal's RRC layer receives a number of consecutive out-of-synchronization indications that are greater than or equal to the first value N1, and the first timer T1 times out, and the runtime of timer T310 is greater than or equal to the second value T2, and during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to the third value N4, and then sends a measurement report to the network device.

[0176] Optionally, the first condition may be referred to as an event, which may be at least one of the above. The first condition and the parameters involved in at least one of the parameters included in the first condition, such as N1, N2, N3, N4, T2, etc., may be configured by the network side and the configuration information may be sent to the terminal via message signaling. Optionally, the message signaling may be RRC signaling, MAC CE signaling, or DCI, etc.

[0177] The measurement report is used to indicate signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement. In one possible implementation, the measurement report includes, but is not limited to, information on at least one of the following neighboring cells:

[0178] (1) The N5 cells with the best signal quality;

[0179] (2) Cells with signal quality greater than or equal to the fourth value H1;

[0180] Based on this design, the terminal includes information about cells with signal quality greater than or equal to the fourth value H1 in the measurement report and sends it to the network device. Alternatively,

[0181] (3) The cell with the best signal quality.

[0182] In another possible implementation, the measurement report includes, but is not limited to, information on at least one of the following in the serving cell: the signal quality of the serving cell; or, the signal quality of the serving cell is worse than a certain threshold.

[0183] In another possible implementation, the signal quality information of the neighboring cell and the serving cell included in the measurement report includes at least one of the following: Measurement event A3: The signal quality of the neighboring cell is better than the signal quality of the current serving cell by a certain threshold; Measurement event A4: The signal quality of the current serving cell is worse than a certain threshold; or, Measurement event A5: The signal quality of the neighboring cell is better than one threshold, while the signal quality of the current serving cell is worse than another threshold.

[0184] S402. Based on the measurement report, the network device selects one or more candidate cells and sends the terminal's context information to the candidate network device to which the selected candidate cell belongs.

[0185] Candidate cells are one or more cells selected by network devices based on measurement reports. In one possible implementation, the network device selects one or more candidate cells with the best signal quality from the neighboring cells included in the measurement report, and sends the terminal's context information to the candidate network devices to which the one or more candidate cells belong.

[0186] Another possible implementation, if the measurement report includes signal quality information of the serving cell, such as the signal quality of the serving cell; or if the signal quality of the serving cell is worse than a certain threshold, then the network device selects one or more candidate cells based on the measurement report. This can be achieved by the network device combining other information, such as location information reported by the terminal, to select and determine candidate cells. Then, the network device sends the terminal's context information to the candidate network devices to which the determined candidate cells belong.

[0187] In one possible implementation, the terminal's context information includes one or more of the following: (1) terminal identification (ID); (2) security capabilities; (3) service information; optionally, the service information may be a protocol data unit (PDU) session; (4) location information; and (5) RRC context. Optionally, the RRC context includes one or more of the following: RRC reconfiguration information, RRC re-establishment information, and RRM configuration.

[0188] S403. The terminal triggers a radio link failure event, performs cell selection, selects a target cell from the candidate cells to initiate the RRC connection re-establishment process.

[0189] In one possible implementation, when the terminal triggers a radio link failure event and performs cell selection, it selects the cell with the best signal quality from the candidate cells as the target cell and sends an RRC connection re-establishment request message to the network device to which the target cell belongs. In step S403, the target cell selected by the terminal to initiate the RRC connection re-establishment process can be one of the candidate cells from which the terminal context information is sent in step S402.

[0190] Since the target network device to which the target cell belongs has already obtained the terminal's context information in step S402, the target network device does not need to wait to obtain the terminal's context information from the source network device before returning an RRC connection re-establishment response message to the terminal to complete the RRC connection reconstruction process.

[0191] In this communication method 100, when the first condition is met, the terminal reports a measurement report. Based on the measurement report, the network side can send the terminal's context information to potential target network devices. In this way, when the terminal experiences a wireless link failure event, there is no need to wait for the target network device to obtain the terminal's context information. A fast RRC connection re-establishment process can be performed, reducing latency and improving the user's service experience.

[0192] Figure 5 This is a flowchart illustrating a communication method 200 provided in an embodiment of this application. The communication method 200 is illustrated using the interaction between a terminal and a network device as an example. The network device may include the network device to which the current serving cell belongs. The method includes, but is not limited to, the following steps:

[0193] S501. The terminal meets the first condition and sends a measurement report; accordingly, the network device receives the measurement report, which is used to indicate the signal quality information of the neighboring cells and / or serving cells obtained by the terminal measurement.

[0194] In one possible implementation, the method further includes: the network device determining and sending first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous out-of-sync indication received by the terminal's RRC layer and not triggering an RLF event; correspondingly, the terminal receiving the first information.

[0195] For details regarding this implementation method, please refer to [link / reference]. Figure 4 The relevant descriptions in the embodiments will not be repeated here.

[0196] S502. Based on the measurement report, the network device selects one or more candidate cells to prepare for Layer 1 or Layer 2 handover.

[0197] The network device can select one or more candidate cells from the neighboring cells included in the received measurement report. The network device and the potential target network device to which the one or more candidate cells belong respectively perform a Layer 1 or Layer 2 handover preparation process. When the handover preparation with the potential target network device is successful, the network device can send Layer 1 or Layer 2 handover configuration information to the terminal; correspondingly, the terminal receives the Layer 1 or Layer 2 handover configuration information.

[0198] The Layer 1 or Layer 2 handover configuration information is used to indicate the configuration information of one or more candidate cells. For example, the Layer 1 or Layer 2 handover configuration information includes one or more of the following: candidate cell identifier, candidate cell SSB configuration, candidate cell RRC reconfiguration, etc.

[0199] S503. When the terminal triggers a wireless link failure event, it executes the RRC connection re-establishment process or the Layer 1 / Layer 2 handover process.

[0200] In one possible implementation, when the terminal triggers a radio link failure event, it executes an RRC connection re-establishment process or a Layer 1 / Layer 2 handover process, including: after the terminal triggers a radio link failure event, if the target cell selected in the first cell selection process is a candidate cell indicated by the Layer 1 or Layer 2 handover configuration information, the terminal executes a Layer 1 or Layer 2 handover process; otherwise, the terminal executes an RRC connection re-establishment process.

[0201] In this implementation, if the target cell selected by the terminal is a candidate cell indicated by the Layer 1 or Layer 2 handover configuration information, and the target cell selected by the terminal has completed the Layer 1 / Layer 2 handover preparation process, then the terminal can directly access the target cell. Compared to the scheme of directly performing the RRC connection re-establishment process, this can restore data transmission more quickly and improve the user's service experience. If the target cell selected by the terminal is not a candidate cell indicated by the Layer 1 or Layer 2 handover configuration information, it indicates that the target cell selected by the terminal has not completed the Layer 1 or Layer 2 handover preparation process, and the RRC connection re-establishment process can be executed.

[0202] Based on this method, the terminal reports a measurement report when the first condition is met. The network side can then use this measurement report to select potential target network devices and initiate a Layer 1 or Layer 2 handover preparation process. This method increases the probability of successful Layer 1 or Layer 2 handover, reduces the probability of RRC connection re-establishment, and improves the user's service experience.

[0203] Figure 6 This is a flowchart illustrating a communication method 300 provided in an embodiment of this application. The communication method 300 is illustrated using the interaction between a terminal and a network device as an example. The network device is the network device to which the current serving cell belongs. The method includes, but is not limited to, the following steps:

[0204] S601. The terminal sends an RRM measurement report, and the network device receives the RRM measurement report reported by the terminal.

[0205] The measurement report may be an event-triggered measurement report or a measurement report periodically reported by the terminal.

[0206] S602. Network devices select one or more candidate cells based on RRM measurement reports to prepare for L1 or L2 handover.

[0207] In step S602, the network device performs an L1 or L2 handover preparation process with the potential target network devices of one or more candidate cells. If the handover preparation process is successful, the network device can send L1 or L2 handover configuration information to the terminal.

[0208] In addition to one or more of the following: candidate cell identifier, candidate cell SSB configuration, candidate cell RRC reconfiguration, L1 or L2 handover configuration information, it may also include early uplink synchronization configuration.

[0209] Early uplink synchronization configuration includes random access resources for Early UL-Sync in candidate cells; for example, random access resources may include one or more of the following: frequency, time-frequency domain timing resources for random access, maximum number of preamble transmissions, or receive window, etc. The embodiments of this application do not limit the specific form of random access resources.

[0210] In one optional implementation, as in steps S601 and S602, after the candidate cell is selected by the network device and L1 or L2 handover preparation is performed, the L1 or L2 handover configuration information is communicated to the terminal. In another optional implementation, the terminal can determine the candidate cell based on signal quality information from neighboring cells and / or the serving cell through its own measurements. Therefore, steps S601 and S602 are optional.

[0211] S603. The network device sends first information, and the terminal receives the first information accordingly. The first information is used to configure a first condition, which is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which has not triggered a radio link failure event.

[0212] Optionally, the network device may also determine the first information before performing step S603.

[0213] S604. When the first condition is met, the terminal performs an early uplink synchronization process in one or more candidate cells.

[0214] Optionally, the first condition can also be referred to as the condition for performing early uplink synchronization. The condition for the terminal to perform early uplink synchronization is that the terminal meets a certain event. When the terminal meets the event, it can perform early uplink synchronization. The event may include at least one of the first conditions, such as: (1) The number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to the first value N1, where N1 is greater than or equal to zero and less than N310. (2) The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation; where N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. (3) The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer and stops when it receives N311 consecutive synchronization indications during its operation. Where T2 is greater than or equal to zero and less than the timing duration of timer T310. Alternatively, (4) During the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to the third value N4. Wherein, the first timer T1 starts when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during its operation. Wherein, N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311; N4 is greater than or equal to zero and less than N3. Alternatively, N4 is greater than or equal to zero and less than N311.

[0215] The first condition and at least one of the parameters involved in the first condition, such as N1, N2, N3, N4, T2, etc., can be configured by the network side and the configuration information is sent to the terminal via message signaling. Optionally, the message signaling can be one or more of RRC signaling, MAC CE signaling, or DCI.

[0216] In one optional implementation, the first information is used to configure a first condition corresponding to each candidate cell. When the terminal meets the first condition, an early uplink synchronization process is performed in the candidate cell, including: the terminal performing the early uplink synchronization process in the candidate cell that meets the corresponding first condition. Optionally, the conditions for triggering the terminal to perform early uplink synchronization for different candidate cells may be different or the same. For example, the content of the first condition for different candidate cells may be different, or the values ​​of each parameter in the corresponding first condition may be different. Based on this method, each candidate cell is independently configured with a corresponding first condition. When the terminal meets the first condition of a certain candidate cell, it can perform an early uplink synchronization process in that candidate cell.

[0217] For example, suppose the candidate cells are cell a and cell b. The first condition configured for cell a is that the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than 2. The first condition configured for cell b is that the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than 3. Then, when the number of consecutive out-of-synchronization indications received by the terminal at the RRC layer is equal to 2, it is considered that the first condition of cell a is met. Therefore, an early uplink synchronization process can be performed in cell a, such as uplink and / or downlink synchronization in cell a.

[0218] In another possible implementation, the first information is used to configure first conditions for multiple or all candidate cells. When the terminal meets the first conditions, an early uplink synchronization process is performed in the candidate cells, including: when the terminal meets the first conditions, selecting one or more candidate cells from multiple or all candidate cells and performing the early uplink synchronization process. Based on this method, all candidate cells can be configured with a unified first condition for performing the early uplink synchronization process; for example, the network side can configure the first conditions for the terminal. When the terminal meets the first conditions, it can select a candidate cell to perform the early uplink synchronization process.

[0219] For example, assuming the candidate cells are cell a and cell b, the first condition for the network equipment to uniformly configure cells a and b is that the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than 2. Then, when the number of consecutive out-of-synchronization indications received by the terminal at the RRC layer is equal to 2, the first condition is considered to be met. Therefore, one or two cells can be selected from cells a and b for early uplink synchronization, such as selecting all candidate cells to perform uplink and / or downlink synchronization.

[0220] In one possible design, when the first condition is met, the terminal can select a candidate cell from multiple or all candidate cells that meets the second condition to perform an early uplink synchronization process. The second condition is related to the signal quality of the candidate cell. For example, the second condition includes at least one of the following: the signal quality of the candidate cell is higher than or equal to a signal quality threshold H2; or, the signal quality of the candidate cell is higher than or equal to the signal quality of the source cell plus a threshold H3. Optionally, the signal quality threshold H2 and the threshold H3 for the signal quality difference between the candidate cell and the source cell can be configured by the network side, predefined, or determined through negotiation between the network side and the terminal side; this application does not impose any limitations on these aspects. This method not only configures the first condition to consider the occurrence of radio link failure but also configures the second condition to consider the signal quality of the candidate cell, thereby enabling the terminal to access the candidate cell with better signal quality as quickly as possible.

[0221] In another possible design, when the first condition is met, the terminal can select N6 cells with the best signal quality from the candidate cells to perform an early uplink synchronization process. Here, N6 is a positive integer, which can be configured by the network side, predefined, or determined through negotiation between the network side and the terminal side; this application does not impose any limitations on this. In this design, the terminal selecting the N6 cells with the best signal quality for the early uplink synchronization process is beneficial for the terminal to switch to a target cell with better signal quality.

[0222] In one optional implementation, after executing step S604, the terminal can receive an LTM cell switch command and perform cell handover after reporting a Layer 1 or Layer 2 measurement report to the network device. In another optional implementation, after executing step S604, the terminal selects a target cell from candidate cells to perform an RRC connection re-establishment process.

[0223] Based on this method, when the first condition is met, the terminal performs an early uplink synchronization process in the candidate cell. This method performs early uplink synchronization in the candidate cell before the RLF event is triggered, reducing the probability of interruption of data packet transmission during Layer 1 or Layer 2 handover due to radio link failure events, thereby improving the user's service experience.

[0224] Figure 7 This is a flowchart illustrating a communication method 400 provided in an embodiment of this application. The communication method 400 is illustrated using the interaction between a terminal and a network device as an example. The network device is the network device to which the current serving cell belongs. The method includes, but is not limited to, the following steps:

[0225] S701. The network device sends first information; correspondingly, the terminal receives the first information, which is a condition related to the continuous out-of-sync indication received by the terminal's RRC layer and has not triggered an RLF event.

[0226] Optionally, the first condition can also be called the condition for performing condition switching. The condition for the terminal to perform condition switching is that the terminal meets a certain event. When the terminal meets the event, condition switching can be performed. The event may include at least one of the first conditions, such as: (1) The number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to the first value N1, where N1 is greater than or equal to zero and less than N310. (2) The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation; where N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. (3) The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications from the terminal's physical layer and stops when it receives N311 consecutive synchronization indications during its operation. Where T2 is greater than or equal to zero and less than the timing duration of timer T310. Alternatively, (4) During the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to the third value N4. Wherein, the first timer T1 starts when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during its operation. Wherein, N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311; N4 is greater than or equal to zero and less than N3. Alternatively, N4 is greater than or equal to zero and less than N311.

[0227] The first condition and at least one of the parameters involved in the first condition, such as N1, N2, N3, N4, T2, etc., can be configured by the network side and the configuration information is sent to the terminal via message signaling. Optionally, the message signaling can be one or more of RRC signaling, MAC CE signaling, or DCI.

[0228] Optionally, before step S701, the network device (i.e., the source network device) also needs to perform a conditional handover preparation process with the potential target network device. For example, the network device configures the handover condition 2 and the handover access resources for the candidate cell (or target candidate cell) for the terminal. The handover condition 2 can be that the signal quality of the candidate cell meets a certain event, such as event A3; the handover access resources can be random access channel (RACH) resources, which are not limited in this application.

[0229] S702. When the terminal meets the first condition, it performs condition switching, such as accessing the candidate cell.

[0230] In one optional implementation, the terminal performs conditional handover when the first condition is met. In another optional implementation, if the network device also configures candidate cells for the terminal as described above under condition 2 for handover, then the terminal can perform conditional handover when either condition 2 or the first condition is met.

[0231] In one optional implementation, the candidate cell is one of the candidate cells configured by the network device for the terminal during the conditional handover preparation process. The terminal can select one of the candidate cells configured by the network device for the terminal as the access candidate cell; for example, the terminal can randomly select a cell as the access candidate cell.

[0232] In another optional implementation, the candidate cell is the cell with the best signal quality measured by the terminal and is also the candidate cell configured by the network equipment for the terminal during the condition handover preparation process.

[0233] Optionally, if the cell with the best signal quality measured by the terminal is not a candidate cell configured for the terminal by the network device during the conditional handover preparation process, then the terminal may not perform the step of accessing the candidate cell.

[0234] In one optional implementation, the network device may explicitly instruct the terminal to perform a conditional handover when a first condition is met. For example, the network device sends second information, which the terminal receives, to instruct the terminal to perform a conditional handover when the first condition is met. Optionally, the network device may send the second information to the terminal via an RRC reconfiguration message during the handover preparation process.

[0235] Based on this method, the terminal can access the candidate cell if the first condition is met before a radio link failure event is triggered. This reduces the probability of the terminal experiencing a radio link failure event and improves the user's service experience.

[0236] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0237] In the above embodiments, the descriptions of each embodiment have their own emphasis, and any multiple embodiments can be used in combination. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0238] Please see Figure 8 , Figure 8This is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Figure 8 As shown, the communication device includes a communication unit 802. Optionally, it may include a processing unit 801.

[0239] In one implementation, the communication device can be a terminal or a device matched with a terminal.

[0240] For example, in one embodiment, the communication unit 802 is configured to receive first information, the first information being configured to configure a first condition, the first condition being a condition related to a continuous out-of-synchronization indication received by the terminal's RRC layer and not triggering a radio link failure event; and further configured to send a measurement report when the terminal satisfies the first condition, the measurement report being configured to indicate signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement.

[0241] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, and the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when N3 consecutive synchronization indications are received during its operation; the runtime of timer T310 is greater than or equal to a second value T2, and timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when N311 consecutive synchronization indications are received during its operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0242] In one possible implementation, the measurement report includes information on at least one of the following among the neighboring cells measured by the terminal: the N5 cells with the best signal quality; cells with signal quality greater than or equal to a fourth value H1; or, the cell with the best signal quality. Wherein, N5 is a positive integer. And / or, the measurement report includes service quality information of the serving cell obtained by the terminal measurement.

[0243] In one possible implementation, the processing unit 801 is configured to perform an RRC connection re-establishment process when a wireless link failure event is triggered.

[0244] In one possible implementation, the processing unit 801 is configured to perform a Layer 1 or Layer 2 handover process when a wireless link failure event is triggered.

[0245] In one possible implementation, the communication unit 802 is further configured to receive handover configuration information of layer 1 or layer 2, the handover configuration information being used to indicate configuration information of one or more candidate cells.

[0246] In one possible implementation, the processing unit 801 is specifically used for:

[0247] When a terminal triggers a radio link failure event and the target cell selected during the cell selection process is a candidate cell indicated by the Layer 1 or Layer 2 handover configuration information, it executes the Layer 1 or Layer 2 handover process.

[0248] When a terminal triggers a radio link failure event and the target cell selected during the cell selection process is not a candidate cell indicated by the Layer 1 or Layer 2 handover configuration information, it executes the RRC connection re-establishment process.

[0249] For example, in another embodiment, the communication unit 802 is configured to receive first information, which is used to configure a first condition. The first condition is a condition related to a continuous out-of-synchronization indication received by the terminal's RRC layer and which does not trigger a radio link failure event. The processing unit 801 is configured to perform an early uplink synchronization process in the candidate cell when the first condition is met.

[0250] In one possible implementation, the candidate cell is a candidate cell configured with Layer 1 or Layer 2 handover configuration information to perform the early uplink synchronization process.

[0251] In one possible implementation, the first information is used to configure the first condition corresponding to each candidate cell; the processing unit 801 is specifically used to perform an early uplink synchronization process in the candidate cell that meets the corresponding first condition.

[0252] Optionally, the conditions for triggering terminals to perform early uplink synchronization may be different or the same for different candidate cells.

[0253] In another possible implementation, the first information is used to configure the first conditions of multiple candidate cells; the processing unit 801 is specifically used to select one or more candidate cells from the multiple candidate cells and perform an early uplink synchronization process when the first conditions are met.

[0254] In one possible design, the processing unit 801 is specifically used to, when the first condition is met, select the N6 cells with the best signal quality among the candidate cells obtained by measurement and perform an early uplink synchronization process. Here, N6 is a positive integer, which can be configured by the network side, predefined, or determined through negotiation between the network side and the terminal side; this application does not impose any limitations on this.

[0255] In another possible design, processing unit 801 is specifically used to, when the first condition is met, select a candidate cell from the candidate cells that meets the second condition and perform an early uplink synchronization process; wherein the second condition is related to the signal quality of the candidate cell. For example, the second condition includes at least one of the following: the signal quality of the candidate cell is higher than or equal to a signal quality threshold H2; or, the signal quality of the candidate cell is higher than or equal to the signal quality of the source cell plus a threshold H3. Optionally, the signal quality threshold H2 and the threshold H3 for the difference in signal quality between the candidate cell and the source cell can be configured by the network side, predefined, or determined through negotiation between the network side and the terminal side; this application does not limit this.

[0256] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; a first timer T1 times out, the first timer T1 being started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stopping when N3 consecutive synchronization indications are received during its operation; the runtime of timer T310 is greater than or equal to a second value T2, timer T310 being started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stopping when N311 consecutive synchronization indications are received during its operation; or, during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4. For example, in yet another embodiment, a communication unit 802 is configured to receive first information, the first information being used to configure a first condition, the first condition being a condition related to the consecutive out-of-synchronization indications received by the terminal's RRC layer and not triggering a radio link failure event. A processing unit 801 is configured to perform access in a candidate cell when the first condition is met.

[0257] In one possible implementation, the candidate cell is a candidate cell for conditional handover configured by the network device.

[0258] In one possible implementation, the processing unit 801 is further configured to perform the step of accessing the candidate cell when the terminal meets the first condition and the cell with the best signal quality measured by the terminal is the candidate cell.

[0259] In one possible implementation, the communication unit 802 is further configured to receive second information, which instructs the terminal to perform a condition switch when the first condition is met.

[0260] In another implementation, the communication device can be a network device or a device compatible with a network device.

[0261] For example, in one embodiment, processing unit 801 is configured to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to a continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event. Communication unit 802 is configured to send the first information.

[0262] In one possible implementation, the communication unit 802 is further configured to receive a measurement report, which indicates signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement. The processing unit 801 is further configured to select one or more candidate cells based on the measurement report. The communication unit 802 is further configured to send the terminal's context information to the candidate network devices to which the one or more candidate cells belong.

[0263] In another possible implementation, the communication unit 802 is further configured to receive a measurement report, which indicates signal quality information of neighboring cells obtained by the terminal. The processing unit 801 is further configured to select one or more candidate cells based on the measurement report. The processing unit 801 is further configured to perform a Layer 1 or Layer 2 handover preparation process with the candidate network devices to which the one or more candidate cells belong. The communication unit 802 is further configured to send Layer 1 or Layer 2 handover configuration information to the terminal when the network device completes the Layer 1 or Layer 2 handover preparation, the handover configuration information indicating the configuration information of one or more candidate cells.

[0264] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, and the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when N3 consecutive synchronization indications are received during its operation; the runtime of timer T310 is greater than or equal to a second value T2, and timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when N311 consecutive synchronization indications are received during its operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0265] In one possible implementation, the measurement report includes information on at least one of the following among the neighboring cells measured by the terminal: the N5 cells with the best signal quality; cells with signal quality greater than or equal to a fourth value H1; or, the cell with the best signal quality. Wherein, N5 is a positive integer. And / or, the measurement report includes service quality information of the serving cell obtained by the terminal measurement.

[0266] For example, in another embodiment, processing unit 801 is configured to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to a continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event. Communication unit 802 is configured to send the first information.

[0267] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, and the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when N3 consecutive synchronization indications are received during its operation; the runtime of timer T310 is greater than or equal to a second value T2, and timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when N311 consecutive synchronization indications are received during its operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0268] For example, in another embodiment, processing unit 801 is configured to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to a continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event. Communication unit 802 is configured to send the first information.

[0269] In one possible implementation, the candidate cell is a candidate cell for conditional handover configured by the network device.

[0270] In one possible implementation, the communication unit 802 is further configured to send second information, which instructs the terminal to perform a condition switch when the first condition is met.

[0271] In one possible implementation, the first condition includes at least one of the following: the number of consecutive out-of-synchronization indications received by the terminal's RRC layer is greater than or equal to a first value N1; the first timer T1 times out, and the first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when N3 consecutive synchronization indications are received during its operation; the runtime of timer T310 is greater than or equal to a second value T2, and timer T310 is started when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when N311 consecutive synchronization indications are received during its operation; or during the operation of the first timer T1 or timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4.

[0272] In addition, the configuration methods of the first condition and its designed parameters mentioned above can be different or the same, and can be configured together or relatively independently.

[0273] Taking the communication device as a terminal or a device matched with a terminal as examples, in the first embodiment, the specific values ​​of the parameters involved in the first condition for triggering the terminal to send a measurement report, such as N1, N2, N3, N4, and T2, are configured relatively independently from the specific values ​​of the parameters involved in the first condition for triggering the terminal to perform an early uplink synchronization process in the second embodiment. Similarly, in the third embodiment, the specific value of the parameters involved in the first condition for triggering the terminal to perform an early conditional handover and access a candidate cell, such as N1, N2, N3, N4, and T2, is configured relatively independently.

[0274] Please see Figure 9 , Figure 9 This is a schematic diagram of another communication device provided in an embodiment of this application. The communication device can be a terminal or a device paired with a terminal. The communication device can be a network device or a device paired with a network device. Optionally, the communication device may further include a memory 903. The transceiver 901, processor 902, and memory 903 can be connected via a bus 904 or other means. The bus is in... Figure 8 The connections between other components are shown in bold lines only and are not intended to be limiting. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, Figure 9 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0275] The coupling in this application embodiment is an indirect coupling or communication connection between devices, units, or modules, which can be electrical, mechanical, or other forms, used for information exchange between devices, units, or modules. This application embodiment does not limit the specific connection medium between the transceiver 901, processor 902, and memory 903 described above.

[0276] Memory 903 may include read-only memory and random access memory, and provides instructions and data to processor 902. A portion of memory 903 may also include non-volatile random access memory.

[0277] The processor 902 can be a central processing unit (CPU), but it can also 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 can be a microprocessor; optionally, the processor 902 can also be any conventional processor.

[0278] In one optional implementation, memory 903 is used to store program instructions; processor 902 is used to call the program instructions stored in memory 903 for execution. Figure 4 , Figure 5 , Figure 6 , Figure 7 The steps performed by the terminal in the corresponding embodiment.

[0279] In one optional implementation, memory 903 is used to store program instructions; processor 902 is used to call the program instructions stored in memory 903 for execution. Figure 4 , Figure 5 , Figure 6 , Figure 7 The steps performed by the network device in the corresponding embodiment.

[0280] In the embodiments of this application, the method provided in the embodiments of this application can be implemented by running a computer program (including program code) capable of performing the steps involved in the above-described method on a general-purpose computing device, such as a computer, which includes processing elements and storage elements such as a CPU, random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, loaded into the aforementioned computing device through the computer-readable recording medium, and run therein.

[0281] Based on the same inventive concept, the communication device provided in the embodiments of this application solves the problem in the same way and with the same beneficial effects as this application. Figure 4 , Figure 5 , Figure 6 , Figure 7 The principles and beneficial effects of solving the problem in the illustrated embodiments are similar. Please refer to the implementation principles and beneficial effects of the method. For the sake of brevity, they will not be repeated here.

[0282] The aforementioned communication device may be, for example, a chip or a chip module.

[0283] This application also provides a chip, which includes a processor capable of performing the aforementioned operations. Figure 4 , Figure 5 The relevant steps of the terminal in the method embodiment are described.

[0284] For example, in one implementation, the chip is used to: receive first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous out-of-sync indication received by the terminal's RRC layer and not triggering a radio link failure event; the terminal satisfies the first condition and sends a measurement report, the measurement report being used to indicate the signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement.

[0285] In another implementation, the processor can execute the aforementioned... Figure 4 , Figure 5 The relevant steps of the network device in the method embodiment are described.

[0286] For example, the chip is used to: determine first information, the first information being used to configure a first condition for triggering the terminal to report a measurement report, the first condition being a condition related to a continuous loss of synchronization indication received by the terminal's RRC layer and not triggering a wireless link failure event; and send the first information.

[0287] In yet another implementation, the processor can execute the aforementioned... Figure 6 The relevant steps of the terminal in the method embodiment are described.

[0288] For example, the chip is used to: receive first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous out-of-synchronization indication received by the terminal's RRC layer and not triggering a radio link failure event; and when the first condition is met, perform an early uplink synchronization process in the candidate cell.

[0289] In yet another implementation, the processor can execute the aforementioned... Figure 6 The relevant steps of the network device in the method embodiment are described.

[0290] For example, the chip is used to: determine first information, the first information being used to configure a first condition for triggering the terminal to perform an early uplink synchronization process, the first condition being a condition related to a continuous out-of-synchronization indication received by the terminal's RRC layer and not triggering a radio link failure event; and send the first information.

[0291] In yet another implementation, the processor can execute the aforementioned... Figure 7 The relevant steps of the terminal in the method embodiment are described.

[0292] For example, the chip is used to: receive first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous out-of-sync indication received by the terminal's RRC layer and not triggering a radio link failure event; and when the first condition is met, access is performed in a candidate cell.

[0293] In yet another implementation, the processor can execute the aforementioned... Figure 7 The relevant steps of the network device in the method embodiment are described.

[0294] For example, the chip is used to: determine first information, the first information being used to configure a first condition for triggering the terminal to perform an early uplink synchronization process, the first condition being a condition related to a continuous out-of-synchronization indication received by the terminal's RRC layer and not triggering a radio link failure event; and send the first information.

[0295] Please see Figure 10 , Figure 10 This is a schematic diagram of a chip module provided in an embodiment of this application. The chip module can execute the relevant steps of the cooperative sensing node or sensing control node in the aforementioned method embodiments. The chip module includes: a communication interface 1001 and a chip 1002.

[0296] The communication interface is used for internal communication within the chip module, or for communication between the chip module and external devices. The communication interface can also be described as a communication module.

[0297] Chip 1002 is used to implement the present application Figure 4 The terminal functions as described in the embodiments. For example, chip 1002 is used to receive first information, which is used to configure a first condition. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which has not triggered a radio link failure event. When the first condition is met, a measurement report is sent. The measurement report is used to indicate the signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement.

[0298] Chip 1002 is used to implement the present application Figure 4 The network device functions as described in the embodiments. For example, chip 1002 is used to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event, and to send the first information.

[0299] Chip 1002 is used to implement the present application Figure 5The terminal functions as described in the embodiments. For example, chip 1002 is used to receive first information, which is used to configure a first condition. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which has not triggered a radio link failure event. When the first condition is met, a measurement report is sent. The measurement report is used to indicate the signal quality information of neighboring cells and / or serving cells obtained by the terminal through measurement.

[0300] Chip 1002 is used to implement the present application Figure 5 The network device functions as described in the embodiments. For example, chip 1002 is used to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event, and to send the first information.

[0301] Chip 1002 is used to implement the present application Figure 6 The terminal functions in the embodiments described. For example, chip 1002 is used to receive first information, which is used to configure a first condition. The first condition is a condition related to the continuous out-of-synchronization indication received by the terminal's RRC layer and which has not triggered a radio link failure event. When the first condition is met, an early uplink synchronization process is performed in the candidate cell.

[0302] Chip 1002 is used to implement the present application Figure 6 The network device functions as described in the embodiments. For example, chip 1002 is used to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event, and to send the first information.

[0303] Chip 1002 is used to implement the present application Figure 7 The terminal functions as described in the embodiments. For example, chip 1002 is used to receive first information, which is used to configure a first condition. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which has not triggered a radio link failure event. When the first condition is met, access is performed in a candidate cell.

[0304] Chip 1002 is used to implement the present application Figure 7 The network device functions as described in the embodiments. For example, chip 1002 is used to determine first information, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's RRC layer and which does not trigger a wireless link failure event, and to send the first information.

[0305] Optionally, the chip module may also include a storage module 1003 and a power module 1004. The storage module 1003 is used to store data and instructions. The power module 1004 is used to provide power to the chip module.

[0306] For various devices and products applied to or integrated into chip modules, each of its modules can be implemented using hardware methods such as circuits. Different modules can be located in the same component (e.g., chip, circuit module, etc.) or different components of the chip module. Alternatively, at least some modules can be implemented using software programs that run on the processor integrated inside the chip module, while the remaining (if any) modules can be implemented using hardware methods such as circuits.

[0307] This application also provides a computer-readable storage medium storing one or more instructions adapted for loading by a processor and executing the methods provided in the above-described method embodiments.

[0308] This application also provides a computer program product containing a computer program or instructions, which, when run on a computer, causes the computer to perform the method provided in the above-described method embodiments.

[0309] It should be noted that, for the sake of simplicity, the above embodiments are all described as a series of actions. Those skilled in the art should understand that this application is not limited to the described order of actions, as some steps in the embodiments of this application can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions, steps, modules, or units involved are not necessarily essential to the embodiments of this application.

[0310] In the above embodiments, the descriptions of each embodiment in this application have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0311] The steps of the methods or algorithms described in the embodiments of this application can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, read-only optical discs (CD-ROMs), or any other form of storage medium well known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Additionally, the ASIC can reside in a terminal device or management device. Alternatively, the processor and storage medium can exist as discrete components in the terminal device or management device.

[0312] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in the embodiments of this application can be implemented, in whole or in part, by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is 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 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 accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can 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)).

[0313] Regarding the modules / units included in the various devices and products described in the above embodiments, they can be software modules / units, hardware modules / units, or a combination of both. For example, for various devices and products applied to or integrated into a chip, all of their modules / units can be implemented using hardware methods such as circuits, or at least some modules / units can be implemented using software programs that run on a processor integrated within the chip, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits; for various devices and products applied to or integrated into a chip module, all of their modules / units can be implemented using hardware methods such as circuits, and different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or different components of the chip module, or at least some modules / units can be implemented using hardware methods such as circuits. The components can be implemented using software programs that run on the processor integrated within the chip module. The remaining (if any) modules / units can be implemented using hardware methods such as circuits. For various devices and products applied to or integrated into the terminal, each of its components / units can be implemented using hardware methods such as circuits. Different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or in different components within the terminal. Alternatively, at least some modules / units can be implemented using software programs that run on the processor integrated within the terminal, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits.

[0314] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A communication method, characterized in that, The method includes: Receive first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous loss of synchronization indication received by the terminal's Infinite Resource Control (RRC) layer and not triggering a radio link failure event; If the first condition is met, a measurement report is sent, which is used to indicate the signal quality information of neighboring cells and / or serving cells obtained by the terminal measurement.

2. The method according to claim 1, characterized in that, The first condition includes at least one of the following: The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310; The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation. N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications during operation. T2 is greater than or equal to zero and less than the timing duration of timer T310. or, During the operation of the first timer T1 or the timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4, wherein N4 is greater than or equal to zero and less than N3; Alternatively, N4 is greater than or equal to zero and less than N311.

3. The method according to claim 1 or 2, characterized in that, The measurement report includes information from the neighboring cells obtained by the terminal measurement, including at least one of the following: The N5 cells with the best signal quality; Cells with signal quality greater than or equal to the fourth value H1; or, The cell with the best signal quality.

4. A communication method, characterized in that, The method includes: First information is determined, which is used to configure a first condition for triggering the terminal to report a measurement report. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's Radio Resource Control (RRC) layer and which does not trigger a radio link failure event. Send the first message.

5. The method according to claim 4, characterized in that, The method further includes: The measurement report is received, and the measurement report is used to indicate the signal quality information of neighboring cells and / or serving cells obtained by the terminal measurement; Based on the measurement report, select one or more candidate cells; Sending the terminal's context information to the candidate network device to which the one or more candidate cells belong, or preparing for Layer 1 or Layer 2 handover with the candidate network device to which the one or more candidate cells belong.

6. The method according to claim 4 or 5, characterized in that, The first condition includes at least one of the following: The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310; The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation. N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications during operation. T2 is greater than or equal to zero and less than the timing duration of timer T310. or, During the operation of the first timer T1 or the timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4, wherein N4 is greater than or equal to zero and less than N3; Alternatively, N4 is greater than or equal to zero and less than N311.

7. The method according to claim 5, characterized in that, The measurement report includes information from the neighboring cells obtained by the terminal measurement, including at least one of the following: The N5 cells with the best signal quality; Cells with signal quality greater than or equal to the fourth value H1; or, The cell with the best signal quality.

8. A communication method, characterized in that, The method includes: Receive first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous loss of synchronization indication received by the terminal's Radio Resource Control (RRC) layer and not triggering a radio link failure event; When the first condition is met, the early uplink synchronization process is performed in the candidate cell.

9. The method according to claim 8, characterized in that, The candidate cell is a candidate cell configured in the Layer 1 or Layer 2 handover configuration information to perform the early uplink synchronization process.

10. The method according to claim 8 or 9, characterized in that, The first information is used to configure the first condition corresponding to each candidate cell; When the first condition is met, the early uplink synchronization process is performed in the candidate cell, including: For candidate cells that meet the corresponding first condition, perform the early uplink synchronization process.

11. The method according to claim 8 or 9, characterized in that, The first information is used to configure the first conditions for multiple candidate cells; When the first condition is met, the early uplink synchronization process is performed in the candidate cell, including: When the first condition is met, one or more candidate cells are selected from the plurality of candidate cells to perform an early uplink synchronization process.

12. The method according to claim 8 or 9, characterized in that, When the first condition is met, the early uplink synchronization process is performed in the candidate cell, including: When the first condition is met, a candidate cell that meets the second condition is selected from the candidate cells, and the early uplink synchronization process is executed; The second condition is related to the signal quality of the candidate cell.

13. The method according to claim 8 or 9, characterized in that, The first condition includes at least one of the following: The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310; The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation. N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications during operation. T2 is greater than or equal to zero and less than the timing duration of timer T310. or, During the operation of the first timer T1 or the timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4, wherein N4 is greater than or equal to zero and less than N3; Alternatively, N4 is greater than or equal to zero and less than N311.

14. The method according to claim 12, characterized in that, The second condition includes at least one of the following: The signal quality of the candidate cell is higher than or equal to the signal quality threshold H2; or... The signal quality of the candidate cell is higher than or equal to the sum of the signal quality of the source cell and the threshold H3.

15. A communication method, characterized in that, The method includes: The first information is determined, which is used to configure a first condition for triggering the terminal to perform an early uplink synchronization process. The first condition is a condition related to the continuous loss-of-synchronization indication received by the terminal's Radio Resource Control (RRC) layer and which has not triggered a radio link failure event. Send the first message.

16. The method according to claim 15, characterized in that, The first condition includes at least one of the following: The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310; The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation. N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications during operation. T2 is greater than or equal to zero and less than the timing duration of timer T310. or, During the operation of the first timer T1 or the timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4, wherein N4 is greater than or equal to zero and less than N3; Alternatively, N4 is greater than or equal to zero and less than N311.

17. A communication method, characterized in that, The method includes: Receive first information, the first information being used to configure a first condition, the first condition being a condition related to a continuous loss of synchronization indication received by the terminal's Radio Resource Control (RRC) layer and not triggering a radio link failure event; If the first condition is met, access is performed in the candidate cell.

18. The method according to claim 17, characterized in that, The candidate cells are candidate cells for conditional handover configured in network devices.

19. The method according to claim 17 or 18, characterized in that, When the cell that satisfies the first condition and has the best signal quality measured by the terminal is the candidate cell, the step of accessing the candidate cell is executed.

20. The method according to claim 19, characterized in that, The method further includes: The terminal receives second information, which instructs the terminal to perform a condition switch when the first condition is met.

21. The method according to claim 17 or 18, characterized in that, The first condition includes at least one of the following: The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310; The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation. N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications during operation. T2 is greater than or equal to zero and less than the timing duration of timer T310. or, During the operation of the first timer T1 or the timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4, wherein N4 is greater than or equal to zero and less than N3; Alternatively, N4 is greater than or equal to zero and less than N311.

22. A communication method, characterized in that, The method includes: First information is determined, which is used to configure a first condition for triggering the terminal to perform a conditional switch. The first condition is a condition related to the continuous loss of synchronization indication received by the terminal's Radio Resource Control (RRC) layer and which has not triggered a radio link failure event. Send the first message.

23. The method according to claim 22, characterized in that, The candidate cells are candidate cells for conditional handover configured in network devices.

24. The method according to claim 22 or 23, characterized in that, The method further includes: Send a second message, which instructs the terminal to perform a condition switch when the first condition is met.

25. The method according to claim 22 or 23, characterized in that, The first condition includes at least one of the following: The number of consecutive out-of-step indications received by the terminal's RRC layer is greater than or equal to a first value N1, where N1 is greater than or equal to zero and less than N310; The first timer T1 times out. The first timer T1 is started when the terminal's RRC layer receives N2 consecutive out-of-synchronization indications and stops when it receives N3 consecutive synchronization indications during operation. N2 is greater than or equal to zero and less than N310; N3 is greater than or equal to zero and less than or equal to N311. The runtime of timer T310 is greater than or equal to the second value T2. Timer T310 starts when the terminal's RRC layer receives N310 consecutive out-of-synchronization indications and stops when it receives N311 consecutive synchronization indications during operation. T2 is greater than or equal to zero and less than the timing duration of timer T310. or, During the operation of the first timer T1 or the timer T310, the number of consecutive synchronization indications received is less than or equal to a third value N4, wherein N4 is greater than or equal to zero and less than N3; Alternatively, N4 is greater than or equal to zero and less than N311.

26. A communication device, characterized in that, It includes units or modules for implementing the method of any one of claims 1 to 3, or units or modules for implementing the method of any one of claims 4 to 7, or units or modules for implementing the method of any one of claims 8 to 14, or units or modules for implementing the method of any one of claims 15 to 16, or units or modules for implementing the method of any one of claims 17 to 21, or units or modules for implementing the method of any one of claims 22 to 25.

27. A communication device, characterized in that, The device includes a processor, a memory, and a computer program or instructions stored in the memory. The processor executes the computer program or instructions to cause the communication device to implement the method of any one of claims 1 to 3, or to implement the steps of the method of any one of claims 4 to 7, or to implement the steps of the method of any one of claims 8 to 14, or to implement the steps of the method of any one of claims 15 to 16, or to implement the steps of the method of any one of claims 17 to 21, or to implement the steps of the method of any one of claims 22 to 25.

28. A chip, characterized in that, The method includes at least one processor configured to execute instructions to cause a communication device including the chip to perform the steps of the method as claimed in any one of claims 1 to 3, or the steps of the method as claimed in any one of claims 4 to 7, or the steps of the method as claimed in any one of claims 8 to 14, or the steps of the method as claimed in any one of claims 15 to 16, or the steps of the method as claimed in any one of claims 17 to 21, or the steps of the method as claimed in any one of claims 22 to 25.

29. A chip module, comprising a communication interface and a chip, characterized in that, The communication interface is used for internal communication within the chip module, or for communication between the chip module and external devices; the chip is used to execute the steps of the method as described in any one of claims 1 to 3, or the steps of the method as described in any one of claims 4 to 7, or the steps of the method as described in any one of claims 8 to 14, or the steps of the method as described in any one of claims 15 to 16, or the steps of the method as described in any one of claims 17 to 21, or the steps of the method as described in any one of claims 22 to 25.

30. A computer-readable storage medium, characterized in that, It stores a computer program or instructions that, when executed, implement the steps of the method as claimed in any one of claims 1 to 3, or the steps of the method as claimed in any one of claims 4 to 7, or the steps of the method as claimed in any one of claims 8 to 14, or the steps of the method as claimed in any one of claims 15 to 21, or the steps of the method as claimed in any one of claims 22 to 25.

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