WO2021238774A1

WO2021238774A1 - Communication method and apparatus

Info

Publication number: WO2021238774A1
Application number: PCT/CN2021/095000
Authority: WO
Inventors: 严乐; 曾清海; 胡星星; 耿婷婷
Original assignee: 华为技术有限公司
Priority date: 2020-05-27
Filing date: 2021-05-20
Publication date: 2021-12-02
Also published as: CN113747478A

Abstract

Disclosed are a communication method and apparatus, which solve the problem of service interruptions caused by an RLF of a first primary cell when a PSCell is added for a terminal device. The method comprises: before a cell that meets a primary secondary cell addition condition is determined according to CPA information, or before the cell that meets the primary secondary cell addition condition is not successfully accessed after the cell that meets the primary secondary cell addition condition is determined, if an RLF of a first primary cell is detected, determining a target cell, and adding the target cell as a target primary secondary cell, or, performing an RRC reestablishment process on the target cell, or deleting/releasing the first primary cell, and then taking the target cell as a second primary cell, wherein the target cell may be the cell that meets the primary secondary cell addition condition, or a cell selected by a terminal device according to an S criterion or other selection conditions. The solution of the present application can be widely applied to the technical field of communications, as well as fields such as artificial intelligence, the Internet of Vehicles and smart home networking.

Description

Communication method and device

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office, the application number is 202010463691.4, and the application name is "Communication Method and Device" on May 27, 2020, the entire content of which is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method and device.

Background technique

At present, in order to improve the reliability of adding a secondary node (Secondary node, SN)/primary and secondary cell (Primary Secondary Cell, PSCell), a conditional PSCell addition (CPA) process is proposed. For example, the master node (master node, MN) sends CPA information of multiple candidate PSCells to the terminal device through one or more radio resource control (radio resource control, RRC) messages. Among them, for each candidate PSCell, the CPA information may include PSCell addition condition (also referred to as SN addition condition) information and configuration information. The PSCell addition condition information may include the PSCell addition execution event and the threshold corresponding to the event. Then, the terminal device uses the candidate PSCell that meets the above adding condition information as the PSCell (or target PSCell) to be accessed, and accesses the PSCell to improve the success rate of adding the PSCell or adding the SN.

However, when the terminal device determines whether the candidate PSCell meets the PSCell addition conditions, if the terminal device detects that the primary cell (Primary Cell, PCell) or primary cell group (master cell group, MCG) on the MN has a radio link failure ( radio link failure (RLF), the terminal device will perform a radio resource control (radio resource control, RRC) re-establishment (RRC reestablishment) process, which will cause service interruption between the terminal device and the network device.

Summary of the invention

The embodiments of the present application provide a communication method and system to solve the problem of service interruption caused by RLF in the primary cell when the terminal device performs the PSCell adding process.

In order to achieve the foregoing objectives, the following technical solutions are adopted in the embodiments of the present application:

In the first aspect, the embodiments of the present application provide a communication method, which may be executed by a terminal device, a chip, or other devices. Taking the method executed by a terminal device as an example, the method may include: the terminal device receives the first main network device The configured conditional PSCell addition (CPA) information, the CPA information indicates the parameters of at least one candidate primary and secondary cell and the primary and secondary cell addition condition information of each candidate primary and secondary cell, and it is determined according to the CPA information to satisfy Before the primary and secondary cells add the conditional cell, the terminal device detects that the first primary cell managed by the first primary network device has a radio link failure (radio link failure, RLF), from at least one candidate primary and secondary cell, Determine the target cell, add the target cell as a target primary and secondary cell, or perform an RRC re-establishment procedure on the target cell, or delete the first primary cell, and use the target cell as the second primary cell.

Based on the method described in the first aspect, before the terminal device determines the target primary and secondary cell to be added, if RLF occurs in the first primary cell, the terminal device selects a cell for re-establishment from the candidate primary and secondary cells, and then selects The cell initiates the RRC re-establishment process. In the candidate PSCell addition preparation phase, the source PCell and the candidate PSCell have already exchanged the context information of the terminal device and forwarded the service data of the terminal device. Therefore, the terminal device can quickly rebuild with the selected cell, reducing The service interruption time between the terminal equipment and the network equipment ensures the service transmission between the terminal equipment and the network equipment. Or, before the terminal device determines the target PSCell to be added, if RLF occurs in the first primary cell, the terminal device selects a cell that meets a certain condition from the candidate PSCells as the new primary cell, and accesses the primary cell. The PSCell selected from the candidate PSCells that can be used as the new primary cell has better signal quality, and during the candidate SN addition preparation stage, the candidate PSCell has already acquired the terminal device context. Therefore, the terminal device can quickly access the new primary cell. The cell reduces the service interruption time between the terminal equipment and the network equipment, and ensures the service transmission between the terminal equipment and the network equipment. Or, before the terminal device determines the target PSCell to be added, if RLF occurs in the first primary cell, the terminal device selects the target PSCell that meets the PSCell addition conditions from the candidate PSCells as the primary and secondary cells to be added, because the candidate PSCells meet the PSCell The signal quality of the cell with the added condition is better, and the candidate PSCell has already obtained the terminal device context during the candidate SN adding preparation stage. Therefore, the terminal device can quickly access the cell that meets the PSCell adding condition, and the cell is the terminal device Provide business services, reduce business interruption time between terminal equipment and network equipment, and ensure business transmission between terminal equipment and network equipment.

In a possible design, the terminal device determining the target cell includes: the terminal device uses a cell satisfying the S criterion among at least one candidate primary and secondary cells as the target cell.

Based on this possible design, the terminal device can select the target cell from candidate primary and secondary cells according to the S criterion. Since the S criterion is the cell selection criterion, or the criterion for selecting the RRC re-establishment cell, the target cell selected by the terminal device The cell quality is better. Because the selected target cell belongs to the candidate primary and secondary cell, and the candidate primary and secondary cell has the context information of the terminal device, the terminal device can quickly rebuild with the selected target cell, reducing the number of terminal equipment and network equipment The service interruption time between the terminal equipment and the network equipment ensures the service transmission between the terminal equipment and the network equipment.

In a possible design, the terminal device determining the target cell includes: the terminal device determines whether there is a cell that meets the first selection condition among the at least one candidate primary and secondary cell; if there is a cell that meets the first selection condition among the at least one candidate primary and secondary cell Cell, the terminal device uses a cell that meets the first selection condition as the target cell, and the first selection condition adds a condition to the primary and secondary cells or is that the signal quality is greater than the first threshold.

Based on this possible design, the terminal device can select the cell that meets the primary and secondary cell addition conditions or whose signal quality is greater than the first threshold among the candidate PSCells as the target cell, that is, select the PSCell with better signal quality from the candidate PSCells as the target cell, so that the terminal The device can quickly access the target cell with better signal quality, and the cell provides relatively high-quality business services for the terminal equipment to ensure the continuity of business transmission and the unaffected transmission quality.

In a possible design, if there is no cell that meets the first selection condition among the at least one candidate primary and secondary cells, the terminal device determining the target cell includes: taking a cell that meets the S criterion among the at least one candidate primary and secondary cells as the target cell.

Based on this possible design, the terminal device can select the target cell from the candidate primary and secondary cells according to the S criterion when there is no cell that meets the first selection condition among the candidate PSCells. That is, the terminal device can select the target cell from the candidate primary and secondary cells according to the method used to select RRC to re-establish the cell. The S criterion selects the target cell. Because the S criterion is the cell selection criterion, or the criterion for selecting the RRC re-establishment cell, the quality of the target cell selected by the terminal device is better, because the selected target cell is a candidate primary and secondary cell , And the candidate primary and secondary cells have the context information of the terminal equipment. Therefore, the terminal equipment can quickly rebuild with the selected target cell, reducing the service interruption time between the terminal equipment and the network equipment, and ensuring the communication between the terminal equipment and the network equipment. Business transmission.

In a possible design, the terminal device determining the target cell includes: within the valid period of the timer, judging whether there is a cell that meets the primary and secondary cell addition condition in at least one candidate primary and secondary cell, and if there is at least one candidate primary and secondary cell The cell that meets the primary and secondary cell addition conditions will be the target cell that meets the primary and secondary cell addition conditions.

Based on this possible design, the terminal device can select a cell that meets the PSCell addition conditions from the candidate PSCells as the target cell within the validity period/a certain period of time, ensuring the timeliness of the selected target cell with better signal quality, so that the terminal device can In a certain period of time, the target cell is quickly selected and accessed, and the cell provides business services for the terminal equipment to ensure the continuity of business transmission.

In a possible design, if the cell that meets the primary and secondary cell addition conditions is not determined within the validity period of the timer, or the timer expires, the terminal device determines the target cell, including: The second selection condition is the cell as the target cell, and the second selection condition is the S criterion or the signal quality is greater than the second threshold.

Based on this possible design, when the terminal device cannot select the target cell within the validity period/a certain period of time, the cell that meets the S criterion or whose signal quality is greater than the second threshold among the candidate PSCells is used as the target cell, that is, the signal quality in the candidate PSCell The better PSCell is used as the target cell, so that the terminal device can access the target cell with better signal quality, and the cell provides relatively high-quality service for the terminal device, ensuring the continuity of service transmission and the unaffected transmission quality.

In a possible design, the method further includes: the terminal device sends to the network device corresponding to the target cell indication information for indicating that RLF occurs in the first primary cell.

Based on this possible design, the terminal device can send indication information to the source PCell: the first primary network device corresponding to the first primary cell through the selected target cell, indicating that RLF occurs in the first primary cell, so that the first primary network device can follow this The indication information learns that RLF occurs in the first primary cell.

In a possible design, when the terminal device adds the target cell as the target primary and secondary cell, the method further includes: the terminal device receives configuration information for reconfiguring the primary cell from the network device corresponding to the target cell, and the configuration information Configured by the first main network device.

Based on this possible design, the primary network device corresponding to the source PCell can configure a new primary cell for the terminal device, and the terminal device changes the primary cell from the first primary cell to the new primary cell to solve the problem of RLF in the first primary cell. The resulting problem is that the terminal device cannot communicate with the first primary cell.

In a second aspect, the present application provides a communication device, which may be a terminal or a chip or a system on a chip in the terminal, and may also be a module or unit in the terminal for implementing the communication method described in the embodiments of the present application. The communication device can realize the functions performed by the terminal in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. In one design, the device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the first aspect. The modules may be hardware circuits, software, or hardware circuits combined with software. . In one design, the communication device may include: a receiving unit and a processing unit;

The receiving unit is configured to receive, from the first primary network device, CPA information indicating the parameters of at least one candidate primary and secondary cell and the primary and secondary cell addition condition information of each candidate primary and secondary cell;

The processing unit is configured to detect RLF in the first primary cell managed by the first primary network device before determining the cell that meets the primary and secondary cell addition conditions according to the CPA information, and determine the target cell from at least one candidate primary and secondary cell, Add the target cell as a target primary and secondary cell, or perform a radio resource control RRC re-establishment procedure on the target cell, or delete the first primary cell, and use the target cell as the second primary cell.

For the specific implementation of the communication device, reference may be made to the behavior and function of the terminal in the communication method provided in the first aspect or any possible design of the first aspect, which will not be repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the first aspect or any possible design of the first aspect.

In a third aspect, a communication device is provided. The communication device may be a terminal or a chip or a system on a chip in the terminal. The communication device can realize the functions performed by the terminal in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware. In a possible design, the communication device may include a processor and a communication interface, and the processor may be used to support the communication device to implement the first aspect or the functions involved in any possible design of the first aspect, for example : The processor is configured to receive from the first primary network device via the communication interface the CPA information indicating the parameters of at least one candidate primary and secondary cell and the primary and secondary cell addition condition information of each candidate primary and secondary cell, and determine that the primary and secondary cells are satisfied according to the CPA information. Before adding the conditional cell to the cell, RLF is detected in the first primary cell managed by the first primary network device, the target cell is determined from at least one candidate primary and secondary cell, and the target cell is added as the target primary and secondary cell, or in the target cell Perform the radio resource control RRC re-establishment process on the above, or delete the first primary cell, and use the target cell as the second primary cell. In another possible design, the communication device may further include a memory, and the memory is used to store computer instructions and/or data. When the communication device is running, the processor executes the computer instructions stored in the memory, so that the communication device executes the communication method described in the first aspect or any one of the possible designs of the first aspect. In the embodiment of the present application, the communication interface may be a transceiver, an interface circuit, a bus interface, a pin, or other device capable of implementing the transceiver function.

In a fourth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the first aspect or any possible design of the foregoing aspects. The communication method.

In a fifth aspect, a computer program product containing instructions is provided. The computer program product may include program instructions. When the computer program product runs on a computer, the computer can execute the first aspect or any one of the foregoing aspects. The communication method described in the design.

In a sixth aspect, a chip system is provided. The chip system includes a processor and a communication interface. The chip system can be used to implement the functions performed by the terminal in the first aspect or any possible design of the first aspect, such as The processor is configured to receive from the first primary network device via the communication interface parameters indicating at least one candidate primary and secondary cell and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell, and determine that the primary and secondary cells are satisfied according to the CPA information Before adding the conditional cell, RLF is detected in the first primary cell managed by the first primary network device, the target cell is determined from at least one candidate primary and secondary cell, and the target cell is added as the target primary and secondary cell, or on the target cell Perform the radio resource control RRC re-establishment process, or delete the first primary cell, and use the target cell as the second primary cell. In a possible design, the chip system further includes a memory for storing program instructions and/or data. When the chip system is running, the processor executes the program instructions stored in the memory to The chip system is made to execute the communication method described in the seventh aspect or any one of the possible designs of the seventh aspect. The chip system can be composed of chips, or include chips and other discrete devices, without limitation.

In a seventh aspect, the embodiments of the present application also provide a communication method. The communication method may be executed by a terminal device, a chip or other device, and the method may be executed by a terminal device. The method may include: The device receives the parameters indicating at least one candidate primary and secondary cell and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell, and determines the first primary and secondary cell that meets the primary and secondary cell addition conditions from the at least one candidate primary and secondary cell. In the secondary cell, before the terminal device successfully accesses the first primary and secondary cell, if the terminal device detects that RLF occurs in the first primary cell managed by the first primary network device, the terminal device will add the first primary and secondary cell as the target primary and secondary cell , Or, determine the target cell, perform the RRC re-establishment procedure on the target cell, or delete the first primary cell, and use the first primary and secondary cell as the second primary cell.

Based on the method described in the seventh aspect, before the terminal device successfully accesses the determined target primary and secondary cell: the first primary and secondary cell, if an RLF occurs in the first primary cell, the terminal device selects the RRC replay from the candidate PSCells. The established cell initiates an RRC re-establishment procedure to the selected target cell. In the candidate PSCell addition preparation stage, the source PCell and the candidate PSCell have already exchanged the context information of the terminal device and forwarded the service data of the terminal device. Therefore, the terminal device can quickly rebuild with the selected target cell. Reduce the service interruption time between the terminal equipment and the network equipment, and ensure the service transmission between the terminal equipment and the network equipment. Or, before the terminal device successfully accesses the determined target primary and secondary cell: the first primary and secondary cell, if RLF occurs in the first primary cell, the terminal device uses the first primary and secondary cell as the new primary cell and accesses the first primary and secondary cell. Primary and secondary cells, because the first primary and secondary cells selected from the candidate PSCells have better signal quality, and the candidate PSCell has already acquired the terminal device context during the candidate SN addition preparation stage, therefore, the terminal device can quickly access the first Primary and secondary cells reduce the service interruption time between terminal equipment and network equipment, and ensure service transmission between terminal equipment and network equipment. Or, before the terminal device successfully accesses the determined target primary and secondary cell: the first primary and secondary cell, if RLF occurs in the first primary cell, the terminal device will use the first primary and secondary cell as the target PSCell, because the candidate PSCell meets the PSCell The signal quality of the first primary and secondary cell to which the condition is added is better, and the candidate PSCell has already obtained the terminal device context during the candidate SN adding preparation stage, so the terminal device can quickly access the first primary and secondary cell that meets the PSCell adding condition , The first primary and secondary cell provides business services for the terminal equipment, reducing the business interruption time between the terminal equipment and the network equipment, and ensuring the service transmission between the terminal equipment and the network equipment.

In a possible design, the terminal device determines the target cell, including: the terminal device continues to access the first primary and secondary cell, and uses the first primary and secondary cell as the target cell; or, the terminal device stops accessing the first primary and secondary cell and sets At least one candidate primary and secondary cell satisfies the S criterion as the target cell.

Based on this possible design, the terminal device can use the first primary and secondary cell that meets the PSCell addition condition as the RRC re-establishment cell or select a cell that meets the S criterion from the candidate primary and secondary cells as the S criterion selection target cell of the RRC re-establishment cell , And the signal quality of the selected RRC re-established cell is better, so that the terminal device can access the target cell with better signal quality, and the cell provides relatively high-quality business services for the terminal device to ensure the continuity of business transmission and The transmission quality is not affected.

In a possible design, the method further includes: the terminal device sends indication information, where the indication information is used to indicate that RLF occurs in the first primary cell.

Based on this possible design, the terminal device can send indication information to the source PCell: the first primary network device corresponding to the first primary cell through the selected target cell, indicating that RLF occurs in the first primary cell, so that the first primary network device can follow this The indication information knows that the terminal device will switch to the primary cell.

In a possible design, when the terminal device adds the first primary and secondary cell as the target primary and secondary cell, the method further includes: the terminal device receives configuration information from the network device corresponding to the first primary and secondary cell, and the configuration information is determined by The first primary network device is configured, and the configuration information is used to reconfigure the primary cell.

Based on this possible design, the primary network device corresponding to the source PCell can configure a new primary cell for the terminal device. There is no need for the terminal device to select a new primary cell through the signaling interaction with the network device, which reduces the terminal device’s choice of a new primary cell. Incoming power consumption and signaling interaction.

In an eighth aspect, the present application provides a communication device. The communication device may be a terminal device or a chip or a system on a chip in the terminal device, and may also be a module or module used in the terminal device to implement the communication method described in the embodiments of the present application. unit. The communication device can realize the functions performed by the terminal device in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. In one design, the device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the seventh aspect. The modules may be hardware circuits, software, or hardware circuits combined with software. . In one design, the communication device may include: a processing unit.

The processing unit is configured to determine from the at least one candidate primary and secondary cell according to the parameter indicating the at least one candidate primary and secondary cell received from the first primary network device and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell Out the first primary and secondary cell that meets the conditions for adding primary and secondary cells;

The processing unit is further configured to detect that RLF occurs in the first primary cell managed by the first primary network device before the terminal device successfully accesses the first primary and secondary cell, and add the first primary and secondary cell as the target primary and secondary cell, or, Determine the target cell, perform the RRC re-establishment procedure on the target cell, or delete the first primary cell, and use the first primary and secondary cell as the second primary cell.

For the specific implementation of the communication device, reference may be made to the behavior and function of the terminal device in the communication method provided in the seventh aspect or any possible design of the seventh aspect, which is not repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the seventh aspect or any possible design of the seventh aspect.

In a ninth aspect, a communication device is provided. The communication device may be a terminal device or a chip or a system on a chip in the terminal device. The communication device can realize the functions performed by the terminal device in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware. In a possible design, the communication device may include a processor and a communication interface, and the processor may be used to support the communication device to implement the seventh aspect or the functions involved in any possible design of the seventh aspect, for example : The processor is configured to determine from the at least one candidate primary and secondary cell according to the parameter indicating the at least one candidate primary and secondary cell received from the first primary network device and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell The first primary and secondary cell that meets the primary and secondary cell addition conditions, before the terminal device successfully accesses the first primary and secondary cell, if RLF is detected in the first primary cell managed by the first primary network device, the first primary and secondary cell is added It is the target primary and secondary cell, or the target cell is determined, and the RRC re-establishment procedure is performed on the target cell, or the first primary cell is deleted, and the first primary and secondary cell is used as the second primary cell. In another possible design, the communication device may further include a memory, and the memory is used to store computer instructions and/or data. When the communication device is running, the processor executes the computer instructions stored in the memory, so that the communication device executes the communication method described in the seventh aspect or any one of the possible designs of the seventh aspect.

In a tenth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the seventh aspect or any possible design of the foregoing aspects The communication method.

In an eleventh aspect, a computer program product containing instructions is provided. The computer program product may include program instructions. When the computer program product runs on a computer, the computer can execute the seventh aspect or any of the foregoing aspects. Possible design of the communication method described.

In a twelfth aspect, a chip system is provided. The chip system includes a processor and a communication interface. The chip system can be used to implement the functions performed by the terminal device in the seventh aspect or any possible design of the seventh aspect. For example, the processor is configured to determine from the at least one candidate primary and secondary cell according to the parameter indicating the at least one candidate primary and secondary cell received from the first primary network device and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell The first primary and secondary cell that meets the conditions for adding primary and secondary cells is generated. Before the terminal device successfully accesses the first primary and secondary cell, if RLF is detected in the first primary cell managed by the first primary network device, the first primary and secondary cell will be The cell is added as a target primary and secondary cell, or the target cell is determined, and the RRC re-establishment process is performed on the target cell, or the first primary cell is deleted, and the first primary and secondary cell is used as the second primary cell. In a possible design, the chip system further includes a memory for storing program instructions and/or data. When the chip system is running, the processor executes the program instructions stored in the memory to The chip system is made to execute the communication method described in the seventh aspect or any one of the possible designs of the seventh aspect. The chip system can be composed of chips, or include chips and other discrete devices, without limitation.

In the thirteenth aspect, the embodiments of the present application also provide a communication method. The method can be executed by a terminal device, a chip or another device. Taking the method executed by the terminal device as an example, the method includes: A primary network device receives the parameters indicating at least one candidate primary and secondary cell and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell, and determines from at least one candidate primary and secondary cell that meets the primary and secondary cell addition conditions The first primary and secondary cell, if the terminal device detects that RLF occurs in the first primary cell after successfully accessing the first primary and secondary cell, the terminal device deletes the first primary cell and determines the first primary and secondary cell as the second primary cell; Alternatively, the terminal device receives the configuration information configured by the first primary network device through the network device corresponding to the first primary and secondary cell, and the configuration information is used to reconfigure the primary cell.

Based on the method described in the thirteenth aspect, after the terminal device successfully accesses the determined target primary and secondary cell: the first primary and secondary cell, if RLF occurs in the first primary cell, the terminal device regards the first primary and secondary cell as the new The primary cell is connected to the first primary and secondary cell. Since the signal quality of the first primary and secondary cell selected from the candidate PSCells is better, and the candidate PSCell has already acquired the terminal device context during the preparation phase for adding the candidate SN, the terminal The device can quickly access the first primary and secondary cell, reduce the service interruption time between the terminal device and the network device, and ensure the service transmission between the terminal device and the network device. Or, after the terminal device successfully accesses the determined target primary and secondary cell: the first primary and secondary cell, if RLF occurs in the first primary cell, the terminal device obtains the relevant information about the reconfiguration of the primary cell through the first primary and secondary cell. Among the candidate PSCells, the signal quality of the first primary and secondary cell that meets the PSCell addition conditions is better. Therefore, the terminal device can quickly obtain the relevant information about the reconfiguration of the primary cell through the first primary and secondary cell, and the first primary and secondary cell is the terminal device Provide business services, quickly access the new main cell, reduce the business interruption time between terminal equipment and network equipment, and ensure business transmission between terminal equipment and network equipment.

In a possible design, the method further includes: the terminal device sends indication information to the network device corresponding to the first primary and secondary cell, where the indication information is used to indicate that RLF occurs in the first primary cell.

Based on this possible design, the terminal device can send indication information to the source PCell through the selected first primary and secondary cell: the first primary network device corresponding to the first primary cell to instruct the first primary cell to generate RLF so that the first primary network The device learns that the primary cell handover of the terminal device will occur according to the instruction information.

In a fourteenth aspect, the present application provides a communication device, which may be a terminal device or a chip or a system on a chip in the terminal device, and may also be a module in the terminal device for implementing the communication method described in the embodiments of the present application Or unit. The communication device can realize the functions performed by the terminal device in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. In one design, the device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the thirteenth aspect. The modules may be hardware circuits, software, or hardware circuits combined with software. accomplish. In one design, for example, the communication device may include: a processing unit.

The processing unit is configured to determine from the at least one candidate primary and secondary cell according to the parameter indicating the at least one candidate primary and secondary cell received from the first primary network device and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell If the first primary and secondary cell that meets the conditions for adding primary and secondary cells is successfully accessed, if RLF is detected in the first primary cell managed by the first primary network device, the first primary cell is deleted, and the first primary cell is deleted. A primary and secondary cell is determined to be the second primary cell; or, the configuration information configured by the first primary network device is received through a network device corresponding to the first primary and secondary cell, and the configuration information is used to reconfigure the primary cell.

For the specific implementation of the communication device, reference may be made to the behavior and function of the terminal device in the communication method provided in the thirteenth aspect or any possible design of the thirteenth aspect, which will not be repeated here.

In a fifteenth aspect, a communication device is provided. The communication device may be a terminal device or a chip or a system on a chip in the terminal device. The communication device can realize the functions performed by the terminal device in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware. In a possible design, the communication device may include a processor and a communication interface, and the processor may be used to support the communication device to implement the thirteenth aspect or the functions involved in any possible design of the thirteenth aspect. For example, the processor determines from the at least one candidate primary and secondary cell according to the parameter indicating the at least one candidate primary and secondary cell received from the first primary network device and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell If the first primary and secondary cell that meets the conditions for adding primary and secondary cells is successfully accessed, if RLF is detected in the first primary cell managed by the first primary network device, the first primary cell is deleted, and the first primary cell is deleted. A primary and secondary cell is determined to be the second primary cell; or, the configuration information configured by the first primary network device is received through a network device corresponding to the first primary and secondary cell, and the configuration information is used to reconfigure the primary cell. In another possible design, the communication device may further include a memory, and the memory is used to store computer instructions and/or data. When the communication device is running, the processor executes the computer instructions stored in the memory, so that the communication device executes the communication method described in the above-mentioned thirteenth aspect or any one of the possible designs of the thirteenth aspect.

In a sixteenth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the thirteenth aspect or any of the thirteenth aspects. A possible design of the communication method described.

In a seventeenth aspect, a computer program product containing instructions is provided. The computer program product may include program instructions. When the computer program product runs on a computer, the computer can execute the above-mentioned thirteenth aspect or the above-mentioned thirteenth aspect. Any possible design of the aspect of the communication method.

In an eighteenth aspect, a chip system is provided. The chip system includes a processor and a communication interface. The chip system can be used to implement the above-mentioned thirteenth aspect or the execution of the terminal device in any possible design of the thirteenth aspect. For example, the processor receives CPA information from at least one candidate primary and secondary cell according to the parameter indicating the at least one candidate primary and secondary cell received from the first primary network device and the primary and secondary cell addition condition information of each candidate primary and secondary cell Determine the first primary and secondary cell that meets the conditions for adding primary and secondary cells. If, after successfully accessing the first primary and secondary cell, RLF is detected in the first primary cell managed by the first primary network device, the first primary cell will be deleted. The first primary and secondary cell is determined to be the second primary cell; or, the configuration information configured by the first primary network device is received through a network device corresponding to the first primary and secondary cell, and the configuration information is used to reconfigure the primary cell. In a possible design, the chip system further includes a memory for storing program instructions and/or data. When the chip system is running, the processor executes the program instructions stored in the memory to make the chip The system executes the communication method described in the above-mentioned thirteenth aspect or any one of the possible designs of the thirteenth aspect. The chip system can be composed of chips, or it can include chips and other discrete devices.

In a nineteenth aspect, an embodiment of the present application further provides a communication system, the communication system includes the communication device and network equipment according to any one of the second aspect to the sixth aspect; or, includes the communication device as described in the eighth aspect to the sixth aspect; The communication device and network equipment according to any aspect of the twelfth aspect; or, including the communication device and network equipment according to any one of the fourteenth aspect to the eighteenth aspect.

Description of the drawings

Figure 1a is a schematic diagram of EN-DC;

Figure 1b is a schematic diagram of NE-DC;

Figure 1c is a schematic diagram of NGEN-DC;

Figure 2 is a schematic diagram of the SN adding process;

FIG. 3 is a schematic diagram of the architecture of a communication system provided by an embodiment of this application;

FIG. 4 is a schematic diagram of the composition of a communication device 400 provided by an embodiment of the application;

FIG. 5 is a flowchart of a communication method provided by an embodiment of this application;

FIG. 6 is a flowchart of a communication method provided by an embodiment of this application;

FIG. 7 is a flowchart of a communication method provided by an embodiment of this application;

FIG. 8 is a schematic diagram of the composition of a communication device 80 provided by an embodiment of this application;

FIG. 9 is a schematic diagram of the composition of a communication system provided by an embodiment of this application.

Detailed ways

First, in order to understand the embodiments of the present application, the terms involved in the embodiments of the present application are described:

In the communication system, in order to improve the spectrum efficiency and user throughput of the system, carrier aggregation (CA) technology and dual connection (DC) technology are introduced.

CA is to aggregate two or more component carriers (component carriers, CC) together to form a larger transmission bandwidth. CA is a technology to increase transmission bandwidth, which can increase the uplink and downlink transmission rate. For example, through CA technology, five 20 megahertz (MHz) CCs can be aggregated to achieve a maximum transmission bandwidth of 100 MHz.

Among them, a carrier may be called a cell (Cell). In the CA scenario, according to the different types of services transmitted on the Cell, multiple cells can be divided into primary cells (Primary Cell, PCell) and multiple secondary cells (Secondary Cell, SCell), and the secondary cell can also be described as a primary cell instead. Secondary cell (Primary Secondary Cell, PSCell). The terminal device can receive common channel information on the PCell, access the network, etc., and can perform service transmission on the SCell.

DC means that a terminal device is connected to two network devices at the same time, and the two network devices provide data transmission services for the terminal device at the same time. Two network devices can be a master network device and a secondary network device. Multiple serving cells covered by the main network device can form a master cell group (MCG). The MCG includes a PCell and optional One or more SCells. The main network device is responsible for the control plane and user plane of the terminal device, and can be responsible for sending service data to the terminal device, and can also be responsible for sending control signaling to the terminal device. Multiple serving cells covered by a secondary network device may form a secondary cell group (SCG), and the SCG may include one PSCell and optionally one or more SCells. The auxiliary network device can be responsible for the user plane of the terminal device and send service data to the terminal device. It is understandable that, in this application, the network device can be an independent base station (base station, BS) or evolved node (evolved node B, eNB), or a centralized unit (CU) and/or a distributed unit (distributed unit, DU) or other devices with protocol stacks, etc., are not restricted.

It should be noted that this application does not restrict the radio access technology (radio access technology, RAT) supported by the two network devices simultaneously accessed by the terminal device, and the RATs supported by the two network devices may be the same or different. RAT can include long term evolution (LTE) technology, new radio (NR) technology, next generation (NG) technology, etc., LTE technology can also be replaced by the evolutionary UMTS terrestrial wireless access ( evolved-UMTS terrestrial radio access, E-UTRA) technology. If the RATs supported by the two network devices that the terminal device supporting DC access is different, the DC may also be called multiple radio dual connection (MR-DC). In addition, the DC scenario described in the embodiments of this application is to illustrate the technical solutions of the embodiments of this application more clearly, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. As the network architecture evolves, the embodiments of this application The technical solution provided is also applicable to application scenarios where the terminal device supports simultaneous access to two or more network devices, and is not limited. Among them, in the application scenario where the terminal device supports simultaneous access to two or more network devices, there is one main network device in the two or more network devices, and the main network device is excluded from the two or more network devices. Network devices other than network devices can all be referred to as auxiliary network devices.

For example, as shown in Figure 1a, the terminal device supports EN-DC (E-UTRA-NR Dual Connectivity), and the terminal device is connected to a base station (LTE eNB) that supports LTE technology and a base station (gNB) that supports NR technology at the same time. LTE eNB As the main network device, it is responsible for the user plane and signaling plane of the terminal device, and the gNB, as the auxiliary network device, is responsible for the user plane of the terminal device. As shown in the left figure in Figure 1a, the LTE eNB is connected to the packet core network (evolved packet core, EPC). The LTE eNB provides air interface transmission resources for the service data between the terminal equipment and the EPC and obtains the service data of the terminal equipment, and passes the gNB The service data of the terminal device is transmitted to the terminal device. Or, as shown in the right figure in Figure 1a, both the LTE eNB and the gNB are connected to the EPC, and the terminal device can transmit service data between the LTE eNB and the gNB and the EPC.

For example, as shown in Figure 1b, the terminal device supports NE-DC (NR-E-UTRA Dual Connectivity), and the terminal device is connected with a base station that supports LTE technology: ng-eNB and a base station that supports NR technology: gNB, with gNB as the master The network equipment is responsible for the user plane and signaling plane of the terminal equipment, and the ng-eNB, as the auxiliary network equipment, is responsible for the user plane of the terminal equipment. As shown in FIG. 1b left, the fifth-generation core network connected GNB ^{(5 th generation core, 5GC)} , gNB provide air interface resources for the transmission of data traffic between the terminal device and the service and acquiring 5GC data terminal device, and by The ng-eNB transmits the service data of the terminal equipment to the terminal equipment. Or, as shown in the right figure in Fig. 1b, both the gNB and the ng-eNB are connected to the 5GC, and the terminal device can transmit service data between the ng-eNB and the gNB and the 5GC.

For another example, as shown in Figure 1c, the terminal device supports NGEN-DC (NG-RAN E-UTRA-NR Dual Connectivity), and the terminal device is connected to a base station supporting LTE technology: ng-eNB and a base station supporting NR technology: gNB at the same time Ng-eNB is the main network device and is responsible for the user plane and signaling plane of the terminal device, and gNB is the auxiliary network device and is responsible for the user plane of the terminal device. As shown in the left figure in Figure 1c, the ng-eNB is connected to the 5GC. The ng-eNB provides air interface transmission resources for the service data between the terminal equipment and the 5GC and obtains the service data of the terminal equipment, and transmits the service data of the terminal equipment through the gNB To the terminal equipment. Or, as shown in the right figure in Fig. 1c, both the ng-eNB and the gNB are connected to the 5GC, and the terminal device can transmit service data between the ng-eNB and the gNB and the 5GC.

In a possible design, SN/PSCell/SCG can be added to terminal devices that support DC through SN addition process/PSCell addition process/SCG addition process, and network services can be provided for terminal equipment through PCell and PSCell, or through MCG and SCG. , Improve data transmission performance. Among them, in order to improve the reliability or robustness of the PSCell addition process, a conditional PSCell addition (CPA) mechanism is proposed. Refer to Figure 2, which is a flow chart of the CPA mechanism, as shown in Figure 2, which may include:

Step 201: The first primary network device respectively initiates an SN addition request (addition request) message to at least one secondary network device, requesting the secondary network device to allocate corresponding radio resources for the dual connection of the terminal device. The SN addition request message may include the context information of the terminal device, the service data of the terminal device, the measurement result of the candidate PSCell corresponding to the auxiliary network device, and the necessary security information of the auxiliary network device, such as a security key, and so on.

Exemplarily, the first main network device that provides network services for the terminal device may trigger the first main network device to send at least one auxiliary The network device sends an SN add request message.

Among them, multiple secondary network devices may correspond to one or more candidate target primary and secondary cells or candidate PSCells. Multiple candidate target primary and secondary cells may belong to the same secondary network device or different secondary network devices, and there is no limitation. When the first primary network device and a certain secondary network device are the same network device, that is, one or some candidate primary and secondary cells and the first primary cell are managed or covered by the same network device (ie, the first primary network device) At this time, step 201 can be skipped and not executed. The first primary cell is a cell managed or covered by the first primary network device.

It should be noted that in each embodiment of the present application, the candidate target primary and secondary cell and candidate PSCell are equivalent concepts, and the two can be described alternatively. For example, the candidate target primary and secondary cell can be described as a candidate PSCell, and the candidate PSCell can be described as Candidate target primary and secondary cells, etc., are not restricted.

Step 202: Each of the at least one auxiliary network device determines whether it accepts the SN addition request message of the first main network device. If the auxiliary network device accepts the SN addition request message of the first main network device, the following process is executed : The secondary network device sends an SN addition request confirmation message to the first primary network device. The SN addition request confirmation message may include the parameters of the candidate PSCell configured by the secondary network device and the primary and secondary cell addition condition information of the candidate PSCell.

Among them, the parameters of the candidate PSCell may include one or more of the following: the priority of the candidate PSCell, the cell group ID (cell group ID) corresponding to the candidate PSCell, the cell index corresponding to the candidate PSCell (e.g., serving cell index (ServCellIndex), The candidate PSCell is the cell-radio network temporary identifier (C-RNTI) allocated by the terminal device, the random access channel (RACH) resource information required to access the candidate PSCell, and the candidate PSCell corresponding Identification information (such as the measurement identifier (measID) corresponding to the candidate PSCell) and/or configuration identification information (such as CPA-ConfigId or other representations) corresponding to the cell, which is not limited; the identification information is used to identify the CPA information corresponding to the cell )), the cell global identity (CGI) of the candidate PSCell, the physical cell identifier (PCI) of the candidate PSCell, the frequency information corresponding to the candidate PSCell, the physical layer configuration parameters corresponding to the candidate PSCell, and media access Control (media access control, MAC) layer configuration parameters, radio link control (RLC) layer configuration parameters, packet data convergence protocol (packet data convergence protocol, PDCP) layer configuration parameters, service data adaptation protocol (service) Data adaptation protocol, SDAP) layer configuration parameters, radio resource control (radio resource control, RRC) layer configuration parameters, etc.

Among them, the primary and secondary cell addition condition information of the candidate PSCell can be used to indicate the primary and secondary cell addition conditions that the candidate PSCell needs to meet as the target PSCell to be added, and the primary and secondary cell addition condition information of the candidate PSCell can include the primary and secondary cell addition execution event Type and primary and secondary cell add the threshold value corresponding to the execution event type. Among them, the primary and secondary cell addition execution event types may include A4 events, B1 events, or other execution event types. One candidate PSCell can be configured with one or more candidate primary and secondary cell addition conditions. For example, a candidate PSCell may be configured with one execution event type, configured with at least one threshold and/or at most two different trigger quantities (trigger quantities), and the trigger quality may include reference signal received power, RSRP), reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), etc.; or, a candidate PSCell can be configured with at most two different execution event types and each The threshold value corresponding to the execution event type. It should be noted that the primary and secondary cells corresponding to different candidate PSCells add the execution event type and/or the threshold corresponding to the execution event type may be the same or different, and there is no restriction. An example, for example, corresponding to the candidate target primary and secondary cell A, the configured primary and secondary cell addition execution event type is A4 event, and the configured corresponding threshold is the first threshold, then when the candidate target primary and secondary cell When the cell signal quality of A is higher than the first threshold, the candidate target primary and secondary cell A can be considered to meet the primary and secondary cell addition conditions (or the candidate target primary and secondary cell A is considered to meet the CPA execution conditions), and the candidate target primary and secondary cell A It can be determined as the target primary and secondary cell to be added.

It should be noted that the secondary network device corresponding to the candidate PSCell can also reject the SN addition request message of the first primary network device. At this time, the secondary network device corresponding to the candidate PSCell replies to the first primary network device with an addition request reject (addition request reject) In response, it refuses to configure candidate PSCells for the terminal device.

Step 203: The first primary network device receives the SN addition request confirmation message sent by one or more secondary network devices, and sends an RRC reconfiguration message to the terminal device. Correspondingly, the terminal device receives the RRC reconfiguration message.

Wherein, the RRC reconfiguration message includes CPA information, and the CPA information includes the parameters of at least one candidate PSCell configured by one or more secondary network devices and the primary and secondary cell addition condition information of at least one candidate PSCell. For example, the first primary network device can receive the SN addition request confirmation message sent by one or more secondary network devices, and obtain the parameters of the candidate PSCell and the primary and secondary cell addition condition information of the candidate PSCell from each SN addition request confirmation message, and it will obtain The parameters of the obtained candidate PSCell and the primary and secondary cell addition condition information of the candidate PSCell are carried in the CPA information.

Further, the RRC reconfiguration message may also include conditional handover (CHO) configuration information of at least one candidate primary cell. At least one candidate primary cell may correspond to at least one candidate PSCell, and the candidate primary cell and its corresponding candidate PSCell perform carrier Aggregate to form DC. For example, each of the at least one candidate primary cell has at least one candidate PSCell corresponding to it, or a certain cell of the at least one candidate primary cell has at least one candidate PSCell corresponding to it, or at least one candidate primary cell Some cells in the cells have at least one candidate PSCell corresponding to each cell in the cells. The CHO configuration information of the candidate primary cell may include the parameters of the candidate primary cell and the primary cell handover condition information of the candidate primary cell. The terminal device can execute the CHO process according to the CHO configuration information of the candidate primary cell, for example, determine the cell that meets the primary cell handover condition among the candidate primary cells as the target primary cell, and then the terminal device attempts to switch to the target primary cell.

That is, in a possible implementation, the RRC reconfiguration message may include at least one candidate PSCell related information (such as CPA information). In another possible implementation, the RRC reconfiguration message may include at least one candidate primary cell related information (such as CHO configuration information) and at least one candidate primary cell corresponding to at least one candidate PSCell related information (such as CPA information). For example, suppose that the candidate primary cell cell1 corresponds to the candidate PSCell: cellC, cellD (or in other words, the candidate primary cell cell1 can perform carrier aggregation with the candidate PSCell (such as cellC or cellD) to form a DC), and the candidate primary cell cell2 corresponds to the candidate PSCell: cellE, cellF (or, the candidate primary cell cell2 can perform carrier aggregation with the candidate PSCell (such as cellE or cellF) to form a DC), the RRC reconfiguration message contains: cell1 parameters and cell1 primary cell handover condition information, cell1 corresponds to cellC Parameters and information of the primary and secondary cell addition condition information of cellC, the parameters of cell1 corresponding to cellD and the primary and secondary cell addition condition information of cellD, the parameters of cell2 and the primary cell handover condition information of cell2, the parameters of cellE corresponding to cell2 and the primary and secondary cells of cellE Cell addition condition information, the parameters of cellF corresponding to cell2, and the primary and secondary cell addition condition information of cellF.

It should be noted that the first primary network device can carry the parameters of the candidate PSCell and the primary and secondary cell addition condition information of the candidate PSCell that it receives from all secondary network devices and send it to the terminal device in an RRC reconfiguration message. Alternatively, the first primary network device sends at least two RRC reconfiguration messages to the terminal device, and each RRC reconfiguration message carries the parameters of the candidate PSCell sent by at least one secondary network device and the primary and secondary cell addition condition information of the candidate PSCell, No restrictions.

Step 204: The terminal device replies an RRC reconfiguration complete message to the first primary network device.

Among them, step 204 is an optional step, and the execution order of step 204 is not limited. Step 204 can be performed before step 206 or step 207, or after step 206 or step 207, or can be combined with step 206 or step 207. Simultaneous execution without restriction.

Step 205: The terminal device judges whether the primary and secondary cell addition condition of at least one candidate PSCell is satisfied according to the CPA information carried in the received RRC reconfiguration message.

Exemplarily, for each candidate PSCell, the terminal device may determine whether the candidate PSCell meets the primary and secondary cell addition condition includes: the terminal device determines whether the measurement result corresponding to each trigger quality in at least one trigger quality of the PSCell satisfies the CPA information If the primary and secondary cell addition condition corresponding to the trigger quality is met, it is determined that the candidate PSCell meets the primary and secondary cell addition condition.

For example, the primary and secondary cell addition execution event type configured with candidate primary and secondary cell A is the A4 event, and two trigger quantities are configured: RSRP and RSRQ, the configured threshold corresponding to RSRP is E, and the configured threshold corresponding to RSRQ The value is F as an example. When the terminal equipment measures that the RSRP of the candidate primary and secondary cell A is higher than E, and the RSRQ of the candidate primary and secondary cell A is higher than F, the terminal equipment can determine that the candidate primary and secondary cell A satisfies the primary and secondary cell addition Condition; otherwise, it is determined that the candidate primary and secondary cell A does not meet the primary and secondary cell addition conditions.

Step 206: The terminal device determines a candidate PSCell that meets the primary and secondary cell addition condition as the target primary and secondary cell.

Wherein, when the RRC reconfiguration message does not include CHO configuration information, but includes CPA information, the terminal device judges whether at least one candidate PSCell meets the primary and secondary cell addition conditions based on the CPA information, and selects at least one candidate PSCell that meets the primary and secondary cell addition conditions. A candidate PSCell of the secondary cell addition condition serves as the target primary and secondary cell.

When the RRC reconfiguration message contains CHO configuration information and CPA information, before the terminal device determines whether the candidate PSCell meets the primary and secondary cell addition conditions, it can select the target that meets the primary cell handover conditions from the candidate primary cells according to the CHO configuration information The primary cell, based on the CPA information of the candidate PSCell, determines whether the candidate PSCell corresponding to the target primary cell meets the primary and secondary cell addition conditions, and selects a candidate PSCell that meets the primary and secondary cell addition conditions among the candidate PSCells corresponding to the target primary cell As the target primary and secondary cell. For example, taking the example in step 203 for illustration, if the determined target primary cell is cell1, the relevant information (such as CPA information) of at least one candidate PSCell corresponding to the target primary cell cell1 is the CPA information of cellC and cellD, namely The parameters of cellC and the primary and secondary cell addition condition information of cellC, the parameters of cellD, and the primary and secondary cell addition condition information of cellD, the terminal device determines the target primary and secondary cell from cellC and cellD, that is, the terminal device will satisfy the primary and secondary cells of cellC and cellD. The cell subject to the secondary cell addition condition is determined as the target primary and secondary cell. Or, for example, if the determined target primary cell is cell1, if the network device configures the target primary and secondary cells for the target primary cell cell1, that is, the RRC reconfiguration message contains information about cell1 (such as the CHO configuration information corresponding to cell1). ), it also contains the relevant information of the target primary and secondary cell corresponding to cell1 (for example, if cellK is configured as the target primary and secondary cell, that is, it also contains the parameters of cellK), the terminal device adds cellK as the target primary and secondary cell.

Step 207: The terminal device initiates a random access procedure to the target primary and secondary cell. After the terminal device successfully accesses the target primary and secondary cell, the terminal device sends an RRC reconfiguration complete message to the network device to which the target primary and secondary cell belongs. Subsequently, the terminal device can perform data transmission with the network device through the target primary and secondary cell.

It should be noted that this application does not limit the execution order of the steps in the embodiments, and the order of the steps can be flexibly exchanged. In addition, each step in the embodiment of the present application is an optional execution step, and each step may be executed individually or in combination, and is not limited.

Although the CPA mechanism can improve the reliability/robustness of the PSCell/SN addition process, the terminal device performs the SN addition process, such as: in the process of judging whether the candidate primary and secondary cells meet the primary and secondary cell addition conditions, or determine Before the target primary and secondary cell that meets the conditions for adding primary and secondary cells is determined, that is, before step 206; or, after the terminal device determines the target primary and secondary cell to be added but before successfully accessing the target primary and secondary cell; or, in After the terminal device successfully accesses the determined target primary and secondary cell, if the terminal device finds that RLF occurs in the first primary cell, that is, the connection between the terminal device and the first primary network device corresponding to the first primary cell is interrupted, then To continue the transmission of service data, the terminal device needs to initiate an RRC re-establishment process. At this time, if the re-established cell does not have the context information of the terminal device, the re-established cell needs to obtain the context information of the terminal device from the first primary network device corresponding to the first primary cell, and obtain the context information of the terminal device from the first primary network device corresponding to the first primary cell. The main network device obtains data packets that have not been successfully transmitted between the terminal device and the first main network device and sends them to the terminal device. This process will cause a long service interruption delay.

To solve this technical problem, an embodiment of the present application provides a communication method: before determining the target primary and secondary cell that meets the primary and secondary cell addition conditions, that is, before step 206; when RLF occurs in the first primary cell, the terminal device will receive at least one The candidate PSCell selects the target cell according to certain criteria, adds the target cell as a target primary and secondary cell, or uses the target cell as an RRC re-establishment cell, performs the RRC re-establishment process on the target cell, or deletes/releases the first Primary cell, use the target cell as a new primary cell for access. Specifically, the execution process may refer to the description in the embodiment corresponding to FIG. 5 below.

Or, after the terminal device determines the target primary and secondary cell to be added but before successfully accessing the target primary and secondary cell, if RLF occurs in the first primary cell, then, in one way, the terminal device continues to access the determined primary and secondary cell. Or, in another approach, the terminal device stops accessing the determined target primary and secondary cell, selects a target cell for re-establishment from candidate PSCells, and performs an RRC re-establishment process on the target cell; Or, in another approach, the terminal device deletes/releases the first primary cell, or releases the connection with the first primary cell, and uses the target primary and secondary cell as the new primary cell. Specifically, the execution process may refer to the description in the embodiment corresponding to FIG. 6 below.

Or, after the terminal successfully accesses the determined target primary and secondary cell, if RLF occurs in the first primary cell, the terminal device deletes/releases the first primary cell, or releases the connection with the first primary cell, and changes the target primary cell. The secondary cell is determined to be the new primary cell; or, the terminal device receives from the target primary and secondary cell the configuration information of the new primary cell configured by the first primary network device corresponding to the first primary cell to the terminal device according to the configuration information and the new primary cell. Establish a connection to the primary cell and resume business data transmission. Specifically, the execution process may refer to the description in the embodiment corresponding to FIG. 7 below.

The communication method provided by the embodiment of the present application will be described below in conjunction with the accompanying drawings in the specification.

The communication method provided in the embodiments of this application can be applied to various communication systems supporting DC, such as: long term evolution (LTE) system, fifth generation (5th generation, 5G) mobile communication system, wireless fidelity (wireless) Fidelity, WiFi) systems, future communication systems, or systems integrating multiple communication systems, etc., are not limited in the embodiment of the present application. Among them, 5G can also be called new radio (NR).

The communication method provided by the embodiments of the present application can be applied to various communication scenarios, for example, can be applied to one or more of the following communication scenarios: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (ultra reliable low latency communication (URLLC), machine type communication (MTC), massive machine type communications (mMTC), device to device (D2D), vehicle outreach (vehicle to everything (V2X), vehicle to vehicle (V2V), and Internet of things (IoT), etc.

In the following, the communication system shown in FIG. 3 is taken as an example to describe the communication method provided in the embodiment of the present application.

FIG. 3 is a schematic diagram of a communication system provided by an embodiment of the present application. As shown in FIG. 3, the communication system may include a network device and multiple terminal devices. The terminal device may be a terminal device that supports DC, and the network device includes an interface Network access equipment may also include core network equipment, and may also include equipment of service providers (such as servers), etc., without limitation. The embodiment of the present application is described by taking the network device as an access network device as an example. The RATs supported by different access network devices may be the same or different. The access network device and the access network device communicate through a wired network or a wireless network, for example, communicate with each other through the Xn interface in FIG. 3. The access network equipment may cover one or more cells, for example, the access network equipment 1 covers the cell 1.1, the access network equipment 2 covers the cell 2.1, and the access network equipment covers the cell 3.1. A terminal device that supports DC can access the access network device in one of the cells and set the access network device as the main network device. For example, the terminal device 1 can access the access network device 1 in the cell 1.1, and The access network device 1 is used as a master network device, that is, a master node (master node, MN). Subsequently, in order to improve the reliability of the service data of the terminal device 1, the access network device 1 may obtain the parameters including one or more candidate PSCells (such as cell 2.1, cell 3.1) and each PSCell with reference to the method shown in FIG. Add the CPA information of the condition information to the primary and secondary cells, and configure the acquired CPA information to the terminal device 1. The terminal device 1 can determine whether each PSCell of one or more candidate PSCells meets the primary and secondary cell addition conditions, and will one or Multiple candidate PSCells select a PSCell (such as cell 3.1) that meets the primary and secondary cell addition conditions to be added as the target primary and secondary cell, and access the target primary and secondary cell to implement DC communication. If an RLF occurs between the terminal device 1 and the access network device 1 during the process of adding the PSCell to the terminal device 1, the terminal device 1 can refer to the methods shown in FIGS. 5 to 7 to select a target cell and access the target cell to resume service transmission.

It should be noted that FIG. 3 is only an exemplary framework diagram, and the number of nodes, the number of cells, and the state of terminal equipment included in FIG. 3 are not limited. In addition to the functional nodes shown in Figure 3, other nodes may also be included, such as core network equipment, gateway equipment, application servers, etc., which are not limited. The access network equipment communicates with the core network equipment through a wired network or a wireless network, for example, through a next generation (NG) interface.

Among them, the network equipment is mainly used to implement the terminal equipment resource scheduling, wireless resource management, wireless access control and other functions. Specifically, the network device may include any one of a base station, a wireless access point, a transmission receive point (TRP), a transmission point (TP), and some other access node. In the embodiments of the present application, the device used to implement the function of the network device may be a network device; it may also be a device that can support the network device to implement the function, such as a chip system. The device may be installed in the network device or combined with the network device. Matching use. In the technical solutions provided in the embodiments of the present application, the device used to implement the functions of the network equipment is a network device as an example to describe the technical solutions provided in the embodiments of the present application.

The terminal equipment (terminal equipment) can be a terminal, a user equipment (UE), a mobile station (mobile station, MS), or a mobile terminal (mobile terminal, MT), etc. Specifically, the terminal device may be a mobile phone (mobile phone), a tablet computer, or a computer with wireless transceiver function, it may also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, or an industrial control device. Wireless terminals, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, wireless terminals in smart cities, smart homes, or vehicle-mounted terminals, etc. In the embodiments of the present application, the device used to realize the function of the terminal device may be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system. The device may be installed in the terminal device or connected to the terminal device. Matching use. In the following, the communication method provided by the embodiment of the present application will be described by taking an example in which the device used to implement the function of the terminal device is a terminal device.

In specific implementation, each network element shown in FIG. 3, such as a terminal device and a network device, may adopt the composition structure shown in FIG. 4 or include the components shown in FIG. 4. 4 is a schematic structural diagram of a communication device 400 provided by an embodiment of the application. When the communication device 400 has the function of the terminal device described in the embodiment of the application, the communication device 400 may be a terminal device or one of the terminal devices. Chip or system on chip. When the communication device 400 has the function of the network device described in the embodiment of the present application, the communication device 400 may be a network device or a chip or a system on a chip in the network device.

As shown in FIG. 4, the communication device 400 may include a processor 401, a communication line 402, and a communication interface 403. Further, the communication device 400 may further include a memory 404. Among them, the processor 401, the memory 404, and the communication interface 403 may be connected through a communication line 402.

The processor 401 may be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, or a microcontroller. , Programmable logic device (PLD) or any combination of them. The processor 401 may also be other devices with processing functions, such as circuits, devices, or software modules.

The communication line 402 is used to transmit information between the components included in the communication device 400.

The communication interface 403 is used to communicate with other devices or other communication networks. The other communication network may be Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. The communication interface 403 may be an interface circuit, a pin, a radio frequency module, a transceiver, or any device capable of realizing communication.

The memory 404 is used to store instructions. Among them, the instruction may be a computer program.

The memory 404 may be a read-only memory (ROM) or other types of static storage devices that can store static information and/or instructions, or it may be a random access memory (RAM) or can store information. And/or other types of dynamic storage devices for instructions, which can also be electrically erasable programmable read-only memory (EEPROM), compact disc (read_only memory, CD_ROM), or other optical disk storage, optical discs Storage, disk storage media or other magnetic storage devices. Optical disk storage includes compact discs, laser discs, optical discs, digital universal discs, or Blu-ray discs, etc.

It should be noted that the memory 404 may exist independently of the processor 401, or may be integrated with the processor 401. The memory 404 may be used to store instructions or program codes or some data. The memory 404 may be located in the communication device 400 or outside the communication device 400 without limitation. The processor 401 is configured to execute instructions stored in the memory 404 to implement the communication method provided in the following embodiments of the present application.

In an example, the processor 401 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 4.

As an optional implementation manner, the communication device 400 includes multiple processors. For example, in addition to the processor 401 in FIG. 4, it may also include a processor 407.

As an optional implementation manner, the communication apparatus 400 further includes an output device 405 and an input device 406. Exemplarily, the input device 406 is a keyboard, a mouse, a microphone, or a joystick, and the output device 405 is a display screen, a speaker, or other devices.

It should be noted that the communication device 400 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal device, an embedded device, a chip system, or a device with a similar structure in FIG. 4. In addition, the composition structure shown in FIG. 4 does not constitute a limitation to the communication device. In addition to the components shown in FIG. 4, the communication device may include more or less components than those shown in the figure, or combine certain components. , Or different component arrangements.

In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The communication method provided by the embodiment of the present application will be described below in conjunction with the communication system shown in FIG. 3. Among them, each device in the following embodiments may have the components shown in FIG. 4. Among them, the actions, terms, etc. involved in the various embodiments of the present application can be referred to each other and are not limited. The name of the message or the name of the parameter in the message in the embodiment of the present application is only an example, and other names may also be used in specific implementations, which are not limited.

Fig. 5 is a flowchart of a communication method provided by an embodiment of the application. As shown in Fig. 5, the method includes:

Step 501: The terminal device receives CPA information from the first main network device.

The terminal device may be any terminal device that supports MR-DC in the system shown in FIG. 3, for example, the terminal device may be a terminal device 1 that supports MR-DC in the system shown in FIG. 3.

The CPA information may indicate the parameters of at least one candidate primary and secondary cell and the primary and secondary cell addition condition information of each candidate primary and secondary cell. At least one candidate primary and secondary cell may refer to one candidate primary and secondary cell or two or more candidates. Primary and secondary cells. Specifically, the relevant description of the CPA information, the parameters of the candidate primary and secondary cells, and the primary and secondary cell addition condition information of the candidate primary and secondary cells can be referred to the above-mentioned FIG. 2 and will not be repeated. For example, taking candidate PSCells including cell 2.1, cell 3.1, and cell 4.1 as an example, the CPA information received by the terminal device from the primary network device includes {parameters of cell 2.1, primary and secondary cell addition condition information of cell 2.1}, {cell 3.1 Parameters of cell 3.1, primary and secondary cell addition condition information} and {parameters of cell 4.1, primary and secondary cell addition condition information of cell 4.1}.

Exemplarily, the terminal device may receive an RRC reconfiguration message carrying CPA information from the first primary network device, and obtain the CPA information from the RRC reconfiguration message. Specifically, the primary network device may request the network device to which at least one candidate primary and secondary cell belongs to obtain the CPA information of at least one candidate primary and secondary cell, and the primary network device may send an RRC reconfiguration message carrying the CPA information to the terminal device, and the terminal device For the execution process of obtaining the RRC reconfiguration message, refer to the above steps 201 to 204, and details are not described herein again.

Step 502: Before determining a cell that meets the primary and secondary cell addition condition based on the CPA information, the terminal device detects that RLF occurs in the first primary cell.

Among them, the first primary cell may be the source primary cell of the terminal device or a cell belonging to the source MCG, the first primary cell may be a cell managed by the first primary network device, and the first primary network device may be a terminal in the first primary cell The equipment provides services. For example, taking the terminal device as the terminal device 1 in FIG. 3 as an example, the first primary cell may be the cell 1.1 in FIG. 3, and the first primary network device may be the access network device 1.

Wherein, the occurrence of RLF in the first primary cell may refer to the failure of normal data transmission between the terminal device and the first primary cell or the first primary network device, such as failure of uplink data transmission and/or downlink data transmission. For example, if the terminal device is terminal device 1 in Figure 3, the first primary cell is cell 1.1, and the first primary network device is access network device 1, as an example, the terminal device detects that RLF occurs in the first primary cell, which can refer to the terminal The connection between the device 1 and the cell 1.1 is disconnected, or the terminal device cannot perform data transmission with the access network device 1, and cannot receive the service data and configuration information sent by the access network device 1.

In this application, before the terminal device determines the cell that meets the primary and secondary cell addition condition based on the CPA information, the terminal device may include: the terminal device determines whether the primary and secondary cell addition condition of at least one candidate primary and secondary cell is satisfied based on the CPA information; or, the terminal device according to The CHO configuration information determines whether at least one candidate primary cell satisfies the primary cell handover condition.

Exemplarily, the terminal device may use the following method to generate RLF in the first primary cell: if the terminal device continuously detects a preset number of out of sync at the physical layer, the terminal device determines that RLF occurs in the first primary cell Or, if the terminal device has not received the service data sent by the first primary network device within a preset time period, the terminal device determines that RLF occurs in the first primary cell; or, if the terminal device sends the first If the number of failures for the primary network device to send service data is greater than or equal to the preset number of failures, the terminal device determines that RLF occurs in the first primary cell.

Among them, the preset time, the preset number of failures, and the preset number can be set as needed, and they can be agreed upon by the protocol or configured by the network device, and are not limited.

Step 503: The terminal device determines the target cell from at least one candidate primary and secondary cell, adds the target cell as the target primary and secondary cell, or performs the RRC re-establishment process on the target cell, or deletes/releases the first primary cell, and sets the target cell The cell serves as the second primary cell.

Wherein, the target cell may be a candidate primary and secondary cell that satisfies the S criterion, or satisfies the following first selection condition, or satisfies the following second selection condition, among at least one candidate primary and secondary cell. The target cell can be used as a target primary and secondary cell to be added or used for RRC re-establishment or replacement of the original primary primary cell as a new primary cell.

Specifically, the terminal device determines the target cell from at least one candidate primary and secondary cell and the processing procedure for the target cell may include any one of the three branches as shown in FIG. 5, and the first branch includes step 5031a and step 5032a; The second branch includes step 5031b to step 5034b; the third branch can include step 5031c to step 5033c. Specifically, which branch of the three branches is used by the terminal device to determine the target cell may be pre-configured or stipulated by the protocol, or the network device may instruct the terminal device which branch to use.

Step 5031a: The terminal device uses a cell meeting the S criterion among at least one candidate primary and secondary cell as a target cell.

Among them, the S criterion can be used to select RRC re-establishment cells. It should be noted that the S criterion can also be replaced with other criteria that can select the RRC re-establishment cell, etc., which is not limited.

Exemplarily, that the terminal device uses a cell that meets the S criterion among the at least one candidate primary and secondary cell as the target cell may include: the terminal device determines whether the at least one candidate primary and secondary cell meets the S criterion, and obtains one or more cells that meet the S criterion; If there is one cell that satisfies the S criterion, then the cell that satisfies the S criterion is regarded as the target cell. If there are multiple cells that satisfy the S criterion, select any cell from the multiple cells that satisfy the S criterion as the target cell, or , Among the multiple cells that meet the S criterion, the cell that meets any one or more of the following conditions is the target cell: the highest priority, the best (or highest) signal quality, the smallest or largest corresponding cell index, and the corresponding configuration Identification information (such as CPA-ConfigId or other identification forms) is the smallest or largest; or, the first cell that meets the S criterion, and so on.

For example, taking candidate PSCells including cell 2.1, cell 3.1, and cell 4.1 as an example, among the candidate PSCells that satisfy the S criterion, the candidate PSCells include {cell 2.1, cell 4.1}, and the terminal device can set {cell 2.1, cell 4.1} in {cell 2.1, cell 4.1} Any candidate PSCell: cell 2.1 or cell 4.1 as the target cell; or, the terminal device may use the cell with higher priority in {cell 2.1, cell 4.1} as the target cell; or, the terminal device may use {cell 2.1, cell 4.1} The cell with the highest signal quality in the cell is the target cell; or, the terminal device can use the cell that meets the S preparation first detected in {cell 2.1, cell 4.1} as the target cell.

Step 5032a: The terminal device regards the target cell as an RRC re-establishment cell, and performs an RRC re-establishment procedure on the target cell.

Exemplarily, the RRC re-establishment procedure performed by the terminal device on the target cell may include:

The terminal device sends an RRC re-establishment request (RRC restablishment request) message to the target cell, where the RRC re-establishment request message may be used to request the establishment of an RRC connection between network devices corresponding to the target cell;

If the network device corresponding to the target cell accepts the RRC re-establishment request message sent by the terminal device, the network device corresponding to the target cell sends an RRC re-establishment message (RRC re-establishment) to the terminal device;

The terminal device receives the RRC re-establishment message, and establishes an RRC connection with the network device corresponding to the target cell. After the terminal device establishes an RRC connection with the network device corresponding to the target cell, it sends an RRC re-establishment complete message to the network device corresponding to the target cell.

Further optionally, when starting to perform step 5031a, the terminal device may stop/no longer determine whether the primary and secondary cell addition condition of at least one candidate primary and secondary cell is satisfied, so as to reduce the power consumption of the terminal device. Alternatively, the terminal device may also continue to determine whether the primary and secondary cell addition conditions of at least one candidate primary and secondary cell are met, and there is no restriction.

Further optionally, the terminal device deletes the CPA information after stopping/no longer determining whether the primary and secondary cell addition condition of at least one candidate primary and secondary cell is satisfied.

Further optionally, the terminal device sends indication information to the network device corresponding to the target cell, and the indication information may be used to indicate that RLF occurs in the first primary cell. Optionally, the indication information may include at least one of the following: The identification information of the first primary cell, the indication information of the occurrence of RLF in the first primary cell, the signal quality of the first primary cell, the signal quality of at least one candidate primary and secondary cell, etc.; the network device corresponding to the target cell can send the indication information to the first The primary network device sends a first message, which is used to notify the first primary network device of the occurrence of RLF in the first primary cell. Optionally, the first message may include indication information that RLF occurs in the first primary cell, or, The first message may include at least one item of the foregoing instruction information. After receiving the first message, the first main network device disconnects from the terminal device, no longer provides network services to the terminal device, and no longer transmits service data with the terminal device.

Wherein, in this application, the identification information of the first primary cell may be used to identify the first primary cell. Exemplarily, the identification information of the first primary cell may be at least one of the following: physical cell identifier (PCI), frequency information, cell global identifier (CGI), cell wireless network temporary wireless identifier ( cell radio network temporary, C-RNTI).

In this way, before the target primary and secondary cell is determined, in the scenario where RLF occurs in the first primary cell, the terminal device selects the target cell for re-establishment from the candidate primary and secondary cells, and initiates the RRC re-establishment process to the selected target cell . Since the candidate PSCell is added in the preparation phase, the source PCell (i.e. the first primary cell) and each candidate primary and secondary cell of the at least one candidate PSCell have already exchanged context information of the terminal device and performed the service data of the terminal device. Therefore, the network device corresponding to the target cell (the target cell is one of the at least one candidate primary and secondary cells) can quickly re-establish the RRC connection with the terminal device and transmit service data according to the context information of the terminal device, reducing the number of terminal devices and The service interruption time between network equipment ensures the service transmission between terminal equipment and network equipment.

Step 5031b: The terminal device judges whether there is a cell that meets the first selection condition among the at least one candidate primary and secondary cell. If there is a cell that meets the first selection condition, step 5032b or step 5033b is executed, and the process ends; if it does not exist, then execute Step 5034b, the process ends.

The first selection condition may be used to select a target primary and secondary cell to be added or a new primary cell, and the first selection condition may include a primary and secondary cell addition condition or the signal quality is greater than a first threshold. Each of the at least one candidate primary and secondary cell may correspond to a first selection condition, and the first selection conditions corresponding to different candidate primary and secondary cells may be the same or different.

Wherein, the primary and secondary cell addition condition included in the first selection condition may be indicated to the terminal device through the primary and secondary cell addition condition information included in the CPA information. The first threshold may be set as required, and the first threshold may be the same as or different from the threshold in the primary and secondary cell addition condition information of the candidate primary and secondary cell. The first threshold may be agreed upon by a protocol or sent by the first main network device to the terminal device, which is not limited.

The signal quality described in this embodiment may include one or more of RSRP, RSRQ, and SINR.

For example, the candidate PSCell includes cell 2.1 and cell 3.1, and the CPA information includes {parameters of cell 2.1, primary and secondary cell addition condition information of cell 2.1 (for example, A4 event, RSRP corresponding threshold E)}, {cell 3.1 Parameters, primary and secondary cell addition condition information of cell 3.1 (for example, A4 event, threshold value F corresponding to RSRQ)) as an example, then the first selection condition corresponding to cell 2.1 can be "the RSRP of the cell is greater than E" or the cell’s RSRP is greater than the first threshold, the first threshold may take a positive number or "0", and the first threshold and E may be the same or different. The first selection condition corresponding to cell 3.1 may be "the RSRQ of the cell is greater than F" or "the RSRQ of the cell is greater than the first threshold", the first threshold may take a positive value or "0", and the first threshold is the same or different from F.

Exemplarily, if the first selection condition includes the primary and secondary cell addition condition, the terminal device judging whether there is a cell satisfying the first selection condition among the at least one candidate primary and secondary cell may include: the terminal device judging the at least one candidate primary and secondary cell Whether the signal quality of one or some candidate primary and secondary cells is higher than the threshold indicated by the primary and secondary cell addition condition information, if the signal quality of a certain candidate primary and secondary cell is higher than the threshold indicated by the primary and secondary cell addition condition information Limit, the candidate primary and secondary cell can be determined as a cell that meets the first selection condition, otherwise, it can be determined that the candidate primary and secondary cell does not meet the first selection condition.

If the first selection condition includes that the signal quality is greater than the first threshold, the terminal device determining whether there is a cell satisfying the first selection condition among the at least one candidate primary and secondary cells may include: determining one or some of the at least one candidate primary and secondary cells Whether the signal quality of the candidate primary and secondary cell is higher than the first threshold, if the signal quality of a certain candidate primary and secondary cell is higher than the first threshold, the candidate primary and secondary cell can be determined as a cell that meets the first selection condition, and vice versa, Then it can be determined that the candidate primary and secondary cell does not meet the first selection condition.

It should be noted that in this application, there may be one or more candidate primary and secondary cells that meet the first selection condition among at least one candidate primary and secondary cell.

Further optionally, when starting to perform step 5031b, if the first selection condition is that the signal quality is greater than the first threshold, and the first threshold is different from the corresponding threshold in the primary and secondary cell addition condition information of the candidate primary and secondary cell, then The terminal device can stop/no longer determine whether at least one candidate primary and secondary cell meets the primary and secondary cell addition conditions, so as to reduce the power consumption of the terminal device. Further, optionally, the terminal device can delete/release the CPA information. Alternatively, the terminal device can also continue to determine whether at least one candidate primary and secondary cell meets the primary and secondary cell addition conditions, which is not limited.

Step 5032b: The terminal device uses a cell that meets the first selection condition as a target cell, and adds the target cell as a target primary and secondary cell.

Exemplarily, in this application, that the terminal device uses a cell that meets the first selection condition as the target cell may include: if there is only one cell that meets the first selection condition, then use the cell that meets the first selection condition as the target cell, if If there are multiple cells that meet the first selection condition, select any cell from the multiple cells that meet the first selection condition as the target cell, or select any one of the following cells from the multiple cells that meet the first selection condition Or a cell with multiple conditions as the target cell: the highest priority, the best/highest signal quality, the largest or smallest corresponding cell index, and the smallest or largest corresponding configuration identification information (such as CPA-ConfigId or other identification forms); or, The first cell that meets the first selection criteria, and so on.

Exemplarily, adding the target cell as the target primary and secondary cell by the terminal device may include: the terminal device uses/applies the parameters of the target cell contained in the CPA information, and the terminal device initiates a random access procedure to the target cell to try to access the target cell. After entering the target cell, after successfully accessing the target cell, you can perform data transmission with the target cell.

For the parameters of the target cell, reference may be made to the description of "parameters of at least one candidate primary and secondary cell" above, and details are not repeated here.

Further optionally, after the terminal device successfully accesses the target cell/target primary and secondary cell, the terminal device sends to the network device corresponding to the target primary and secondary cell indication information for indicating that RLF occurs in the first primary cell. Optionally, the The indication information may include at least one of the following: identification information of the first primary cell, indication information of the occurrence of RLF in the first primary cell, signal quality of the first primary cell, signal quality of at least one candidate primary and secondary cell, etc.; target primary and secondary cell After the corresponding network device receives the indication information, it can send a second message to the first primary network device. The second message is used to notify the first primary network device that RLF occurs in the first primary cell, and the second message may include The indication information of the occurrence of RLF in the first primary cell, or the second message may include at least one item of the above indication information.

Further optionally, after the first main network device receives the second message, the first main network device disconnects from the terminal device, no longer provides network services for the terminal device, and no longer transmits service data with the terminal device. Optionally, after receiving the second message, the first primary network device reconfigures a new primary cell. For example, the first primary network device may configure a new primary cell for the terminal device to replace the first primary cell, or in other words, the first primary cell A primary network device can configure a new primary cell to be switched to for the terminal device, and the new primary cell and the first primary cell are not the same cell. After the first primary network device determines the new primary cell or the configuration information corresponding to the new primary cell, in one implementation, the first primary network device can send the configuration information corresponding to the determined new primary cell to the target primary and secondary cell Or the network device to which the target primary and secondary cell belongs (for example, the first primary network device can send the PDCP SDU corresponding to the above configuration information to the target primary and secondary cell or the network device to which the target primary and secondary cell belongs), and then, the target primary and secondary cell belongs to The network device can send the configuration information corresponding to the new primary cell to the terminal device through its own SRB3, or, in another implementation manner, the first primary network device can send the configuration information corresponding to the new primary cell through split SRB1 To the target primary and secondary cell or the network device to which the target primary and secondary cell belongs (for example, the first primary network device can send the PDCP PDU or RLC SDU corresponding to the above configuration information to the target primary and secondary cell or the network device to which the target primary and secondary cell belongs) Then, the network device to which the target primary and secondary cell belongs can send configuration information corresponding to the new primary cell to the terminal device. Wherein, the configuration information corresponding to the new primary cell may be determined by the first primary network device. Optionally, the first primary network device may determine that CPA has occurred too late based on the received second message, and the subsequent primary network device (such as the first primary network device or the network device to which at least one candidate primary and secondary cell belongs) may adjust the CPA Information, try to avoid late CPA, for example, through the adjustment of CPA information, so that the terminal device can successfully access the cell that meets the primary and secondary cell addition conditions or successfully complete the SN/SCG/PSCell addition process, and avoid the SN/SCG/PSCell addition process RLF occurs in the first primary cell or the first primary network device before completion.

It can be understood that after receiving the second message, the first primary network device can configure a new primary cell for the terminal device. For example, the first primary network device sends configuration information to the network device corresponding to the target primary and secondary cell. The configuration information can be Used to reconfigure the primary cell; after receiving the configuration information, the network device corresponding to the target primary and secondary cell sends the configuration information to the terminal device; after receiving the configuration information, the terminal device tries to transfer the primary cell from the first cell to the first cell based on the configuration information. A primary cell is changed to the new primary cell indicated in the configuration information.

Step 5033b: The terminal device uses the cell meeting the first selection condition as the target cell, deletes/releases the first primary cell, and uses the target cell as the second primary cell.

Exemplarily, the terminal device deleting/releasing the first primary cell may include: the terminal device deleting the configuration information/parameters corresponding to the first primary cell, or the terminal device releases the connection with the first primary cell, or the terminal device stops communicating with the first primary cell. Data transmission of a primary cell, or the terminal device disconnects from the first primary cell, etc.

Exemplarily, the terminal device using the target cell as the second primary cell may include: the terminal device uses/applies the parameters of the target cell contained in the CPA information, initiates a random access procedure to the target cell, and after successfully accessing the target cell , The target cell is determined as the new primary cell, and subsequent terminal equipment can perform data transmission with the target cell.

Further optionally, after the terminal device successfully accesses the second primary cell, the terminal device sends to the network device corresponding to the second primary cell indication information for indicating that RLF occurs in the first primary cell, and the indication information may include at least one of the following Items: the identification information of the first primary cell, the indication information of the occurrence of RLF in the first primary cell, the signal quality of the first primary cell, the signal quality of at least one candidate primary and secondary cell, etc.; the network device corresponding to the second primary cell receives the After the indication information, a third message can be sent to the first primary network device. The third message can be used to notify the first primary network device that RLF has occurred in the first primary cell. Optionally, the third message can include the first primary network device. The indication information that the RLF occurs in the cell, or the third message may include at least one of the above indication information. After receiving the third message, the first main network device disconnects from the terminal device, no longer provides network services for the terminal device, and no longer transmits service data with the terminal device.

In this way, before determining the target primary and secondary cell, when RLF occurs in the first primary cell, the terminal device selects a cell that meets the first selection condition from at least one candidate primary and secondary cell as the target cell, and adds it as the target primary and secondary cell Or as a new primary cell. Since in the candidate PSCell addition preparation phase, the source PCell (i.e., the first primary cell) and at least one candidate PSCell have already exchanged the context information of the terminal device and forwarded the service data of the terminal device. Therefore, the terminal device can quickly Access the network equipment corresponding to the target cell to transmit service data, reduce the service interruption time between the terminal equipment and the network equipment, and ensure the service transmission between the terminal equipment and the network equipment.

Step 5034b: The terminal device uses a cell meeting the S criterion among at least one candidate primary and secondary cell as a target cell, and the terminal device performs an RRC re-establishment procedure on the target cell.

Wherein, in step 5034b, the process for the terminal device to set at least one candidate primary and secondary cell that meets the S criterion as the target cell may refer to the above step 5031a for the terminal device to use at least one candidate primary and secondary cell that meets the S criterion as the target cell. For the process, the process of the terminal device performing the RRC re-establishment process on the target cell in step 5034b can refer to the terminal device using the target cell as the RRC re-establishment cell in step 5032a to perform the RRC re-establishment process on the target cell, which will not be repeated.

Among them, the process of the terminal device performing the RRC re-establishment process refers to the prior art, and will not be repeated. The cell re-established by the terminal device may be any cell that satisfies the S criterion or the cell selection criterion, such as the first primary cell or other cells, which is not limited in this embodiment.

Further optionally, after the terminal device establishes an RRC connection with the target cell, the terminal device may also send to the network device corresponding to the target cell indication information for instructing the occurrence of RLF in the first primary cell. Specifically, for the process, refer to the process in which the terminal device sends the instruction information to the network device corresponding to the target cell in step 5032a, and details are not described herein again.

In this way, before the target primary and secondary cell is determined, when RLF occurs in the first primary cell and there is no cell that satisfies the first selection condition among at least one candidate primary and secondary cell, the terminal device selects from at least one candidate primary and secondary cell that satisfies S The standard cell is used as the target cell for RRC re-establishment. Since the candidate PSCell is added in the preparation phase, the source PCell (i.e. the first primary cell) and each candidate primary and secondary cell of the at least one candidate PSCell have already exchanged context information of the terminal device and performed the service data of the terminal device. Forwarding, therefore, the terminal device can quickly complete the re-establishment process with the network device corresponding to the target cell, and there is no need to perform the terminal context information acquisition process in the re-establishment process.

Step 5031c: Within the validity period of the timer, the terminal device determines whether there is a cell that meets the primary and secondary cell addition conditions among at least one candidate primary and secondary cell. If there is a cell that meets the primary and secondary cell addition conditions, step 5032c is executed, and the process ends; If no cell meeting the primary and secondary cell addition condition is determined within the validity period of the timer or the timer expires, step 5033c is executed, and the process ends.

Among them, a timer (timer) may be used to limit the effective duration of the action for the terminal device to determine whether there is a cell that meets the primary and secondary cell addition condition in at least one candidate primary and secondary cell according to the CPA information. The related parameters of the timer, such as: the validity period of the timer can be set as required, and the related parameters of the timer can be configured by the first primary network device to the terminal device before RLF occurs in the first primary cell (for example, sent by the first primary network device) The RRC reconfiguration message containing the CPA information to the terminal device contains the relevant parameters of the timer), which can also be pre-defined by the protocol and is not limited. Wherein, the process of the terminal device judging whether there is a cell satisfying the primary and secondary cell addition condition in at least one candidate primary and secondary cell can refer to the above, and will not be repeated.

For example, take the timer's validity period of 10s as an example. In a possible implementation manner, the terminal device starts the timer when receiving the CPA information configured by the first primary network device. When RLF occurs in the first primary cell, if the timer does not expire, the terminal device can continue to determine at least Whether there is a cell that satisfies the primary and secondary cell addition conditions in a candidate primary and secondary cell, if it is determined within 10s that the cell that meets the primary and secondary cell addition conditions is determined, step 5032c is executed, if no cell that meets the primary and secondary cell addition conditions is found within 10s , Or, when the RLF occurs in the first primary cell, the timer expires/ends work, and step 5033c is executed. In another possible implementation manner, when RLF occurs in the first primary cell, the terminal device starts the timer and triggers the timer to start working. The terminal device determines whether there is at least one candidate primary and secondary cell that meets the requirements of the primary and secondary cells within the validity period of the timer. For the cell with the secondary cell addition condition, if the cell that meets the primary and secondary cell addition condition is determined within 10s, step 5032c is executed. If no cell that meets the primary and secondary cell addition condition is found within 10s, or the timer expires/ends work, Step 5033c is executed.

Step 5032c: The terminal device uses the cell that meets the primary and secondary cell addition conditions as the target cell, and adds the target cell as the target primary and secondary cell; or, deletes/releases the first primary cell and sets the target cell as the second primary cell.

Wherein, step 5032c can refer to the description of step 5032b and step 5033b, and will not be repeated.

Further optionally, in the case where the target cell is added as the target primary and secondary cell, after the terminal device successfully accesses the target cell/target primary and secondary cell, the terminal device sends to the network device corresponding to the target primary and secondary cell to indicate the first The indication information of the occurrence of RLF in a primary cell, and the relevant description of the indication information can refer to the description in step 5032b, which will not be repeated. Further, after receiving the indication information, the network device corresponding to the target primary and secondary cell can send a second message to the first primary network device. After the first primary network device receives the second message, the first primary network device disconnects from the The connection of the terminal device no longer provides network services for the terminal device, no longer transmits business data with the terminal device, and configures the terminal device with a new primary cell that needs to be switched to. Specifically, for the description of the second message, the process of sending the second message by the network device corresponding to the target primary and secondary cell, and the processing process after the first primary network device receives the second message, please refer to step 5032b, which will not be repeated here. .

Further optionally, after the terminal device uses the target cell as the second primary cell and successfully accesses the second primary cell, the network device corresponding to the second primary cell of the terminal device sends an indication for indicating that RLF occurs in the first primary cell Information, the relevant description of the instruction information can refer to the description in step 5033b, and will not be repeated here. Further, after receiving the instruction information, the network device corresponding to the second primary cell can send a third message to the first primary network device. After the first primary network device receives the third message, the first primary network device disconnects from The connection of the terminal device no longer provides network services for the terminal device, and no longer transmits business data with the terminal device. Specifically, the relevant description of the third message, the process of sending the third message by the network device corresponding to the second primary cell, and the processing process after the first primary network device receives the third message can refer to the description in step 5033b, which will not be repeated here. .

Step 5033c: The terminal device uses the cell that meets the second selection condition among the at least one candidate primary and secondary cells as the target cell, deletes/releases the first primary cell, sets the target cell as the second primary cell, or performs RRC reconfiguration on the target cell. Establish a process.

Among them, the terminal device deletes/releases the first primary cell, and the process of setting the target cell as the second primary cell can refer to the corresponding description above, and the process of the terminal equipment performing the RRC re-establishment process on the target cell can refer to the corresponding description above, and will not be repeated here. .

Wherein, the second selection condition may include the S criterion or the signal quality is greater than the second threshold. Each of the at least one candidate primary and secondary cell may correspond to a second selection condition, and the second selection conditions corresponding to different candidate primary and secondary cells may be the same or different. The second threshold may be set as required, and the second threshold may be the same or different from the first threshold. For example, the second threshold may be a threshold lower than the first threshold. The second threshold may be the same as or different from the threshold in the primary and secondary cell addition condition information of the candidate primary and secondary cell. The second threshold may be agreed upon by a protocol, or sent by the first main network device to the terminal device, which is not limited. The signal quality described in this embodiment may include one or more of RSRP, RSRQ, and SINR.

Exemplarily, if the second selection condition includes the S criterion, the terminal device judging whether there is a cell satisfying the second selection condition among the at least one candidate primary and secondary cell may include: the terminal device judging one or the other of the at least one candidate primary and secondary cell Whether the signal quality of some candidate primary and secondary cells meets the S criterion, if the signal quality of the candidate primary and secondary cell meets the S criterion, the primary and secondary cell can be determined as the cell that meets the second selection condition, otherwise, the primary and secondary cell can be determined The secondary cell does not meet the second selection condition.

If the second selection condition includes that the signal quality is greater than the second threshold, the terminal device judging whether there is a cell that meets the second selection condition among the at least one candidate primary and secondary cells may include: judging one or some of the at least one candidate primary and secondary cells Whether the signal quality of the candidate primary and secondary cell is higher than the second threshold, if the signal quality of a certain candidate primary and secondary cell is higher than the second threshold, the candidate primary and secondary cell can be determined as a cell that meets the second selection condition, and vice versa, It can be determined that the candidate primary and secondary cell does not meet the second selection condition.

It should be noted that, in this application, there may be one or more cells that meet the second selection condition among the candidate primary and secondary cells. The terminal device using the cell that meets the second selection condition as the target cell may include: if there is one cell that meets the second selection condition, then the cell that meets the second selection condition is set as the target cell, and if the cell that meets the second selection condition is If multiple, select any cell from multiple cells that meet the second selection condition as the target cell, or select one of multiple candidate primary and secondary cells that meet the second selection condition that meets any one or more of the following conditions The candidate primary and secondary cell as the target cell: the highest priority, the best (or highest) signal quality, the smallest or largest corresponding cell index, and the smallest or largest corresponding configuration identification information (such as CPA-ConfigId or other identification forms); or, The first cell that satisfies the second selection condition, and so on.

Further optionally, when starting to perform step 5033c, if the second selection condition is that the signal quality is greater than the second threshold, and the second threshold is different from the corresponding threshold in the primary and secondary cell addition condition information of the candidate primary and secondary cell, then The terminal device can stop/no longer determine whether at least one candidate primary and secondary cell meets the primary and secondary cell addition conditions, so as to reduce the power consumption of the terminal device. Further, optionally, the terminal device can delete/release the CPA information. Optionally, when starting to perform step 5033c, if the second selection condition is that the signal quality is greater than the second threshold, when the terminal device performs step 5033c, the terminal device can determine whether at least one candidate primary and secondary cell meets the S criterion, which is not limited .

Further optionally, after the terminal device performs the RRC re-establishment procedure on the target cell, the terminal device sends to the network device corresponding to the target cell the indication information used to indicate the occurrence of RLF in the first primary cell, and the relevant description of the indication information can refer to the steps The description in 5032a will not be repeated here. Further, after receiving the indication information, the network device corresponding to the target cell can send a first message to the first main network device. After the first main network device receives the first message, the first main network device disconnects from the terminal device. The connection, no longer provides network services for the terminal equipment, and no longer transmits business data with the terminal equipment. Specifically, the related description of the first message, the process of sending the first message by the network device corresponding to the target cell, and the processing process after the first primary network device receives the first message can refer to the description in step 5032a, and will not be repeated.

In this way, before determining the target primary and secondary cell, when RLF occurs in the first primary cell, the terminal device selects the cell that meets the primary and secondary cell addition conditions from the candidate primary and secondary cells within the validity period as the target cell to add (e.g. Add the target cell as a target primary and secondary cell) or use the target cell as a new primary cell, or, after the timer expires, select a target cell that satisfies the second selection condition for RRC re-establishment or as a new primary cell. Since in the candidate PSCell addition preparation phase, the source PCell (i.e., the first primary cell) and at least one candidate PSCell have already exchanged the context information of the terminal device and forwarded the service data of the terminal device. Therefore, the terminal device can quickly Access the network equipment corresponding to the target cell to transmit service data, reduce the service interruption time between the terminal equipment and the network equipment, and ensure the service transmission between the terminal equipment and the network equipment.

The method shown in Figure 5 describes the communication method provided in this application in the scenario where RLF occurs in the first primary cell before the terminal device determines the target primary and secondary cell. The method is taken as an example to describe the communication method in the scenario where RLF occurs in the first primary cell after the terminal device determines the target primary and secondary cell but before successfully accessing the target primary and secondary cell:

Fig. 6 is a flowchart of a communication method provided by an embodiment of the application. As shown in Fig. 6, the method includes:

Step 601: The terminal device receives CPA information from the first main network device.

Wherein, step 601 can refer to the description of step 501, and will not be repeated.

Step 602: After the terminal device determines the first primary and secondary cell that meets the primary and secondary cell addition conditions from at least one candidate primary and secondary cell based on the CPA information, the terminal device detects the first primary and secondary cell before accessing the first primary and secondary cell RLF occurs.

Wherein, the first primary and secondary cell may be a cell that meets the primary and secondary cell addition condition among at least one candidate primary and secondary cell. There may be one or more cells that meet the conditions for adding primary and secondary cells in at least one candidate primary and secondary cell. Specifically, if there are multiple cells that meet the conditions for adding primary and secondary cells among at least one candidate primary and secondary cell, at least one Any one of the multiple cells that meet the primary and secondary cell addition conditions among the candidate primary and secondary cells is determined to be the first primary and secondary cell, or the first primary and secondary cell may be at least one candidate primary and secondary cell that meets the primary and secondary cell addition conditions Among the multiple cells, the cell that meets any one or more of the following conditions: the highest priority, the best (or highest) signal quality, the smallest or largest corresponding cell index, and the corresponding configuration identification information (such as CPA-ConfigId or Other identification forms) minimum or maximum; or, the first cell that meets the conditions for adding primary and secondary cells, and so on.

Specifically, the process for the terminal equipment to determine the first primary and secondary cell that meets the primary and secondary cell addition conditions from at least one candidate primary and secondary cell according to the CPA information can refer to the above, and the process for the terminal equipment to detect that RLF occurs in the first primary cell can refer to The description of step 502 will not be repeated here.

Among them, the first primary and secondary cell can be the target primary and secondary cell to be added; or the first primary and secondary cell or at least one candidate primary and secondary cell that meets the S criterion can be the RRC reestablished cell, and the terminal device can be in the first primary and secondary cell. The RRC re-establishment process is performed on the cell or at least one candidate primary and secondary cell that meets the S criterion; or the first primary and secondary cell is used as the new primary cell. For example, the terminal device can delete/release the first primary cell and set the first primary and secondary cell The secondary cell serves as the new primary cell (for example, it is recorded as the second primary cell) and so on.

Further, the method shown in FIG. 6 may further include: step 603 or step 604 or step 605. Specifically, which step of step 603, step 604, and step 605 is performed by the terminal device may be pre-configured or stipulated by the protocol, or the network device may instruct the terminal device to perform which step, which is not limited.

Step 603: The terminal device adds the first primary and secondary cell as the target primary and secondary cell.

For example, the terminal device can continue to access the first primary and secondary cell. Specifically, in step 603, refer to the process of adding the target cell as the target primary and secondary cell in step 5032b, and details are not described herein again.

Further optionally, after the terminal device successfully accesses the first primary and secondary cell, the terminal device sends to the network device corresponding to the first primary and secondary cell indication information indicating that RLF occurs in the first primary cell. For the relevant description of the indication information, please refer to The description in step 5032b will not be repeated. Further, after receiving the indication information, the network device corresponding to the first primary and secondary cell may send a second message to the first primary network device. After the first primary network device receives the second message, the first primary network device disconnects The connection with the terminal equipment no longer provides network services for the terminal equipment, no longer transmits business data with the terminal equipment, and configures the terminal equipment with a new primary cell that needs to be switched to. Specifically, the related description of the second message, the process of sending the second message by the network device corresponding to the first primary and secondary cell, and the processing process after the first primary network device receives the second message can refer to the target cell (or target cell) in step 5032b. The processing procedure after the network device corresponding to the primary and secondary cell sends the second message and the first primary network device receives the second message will not be repeated.

Step 604: The terminal device determines the target cell, and performs an RRC re-establishment procedure on the target cell.

Exemplarily, determining the target cell by the terminal device may include: the terminal device uses the first primary and secondary cell as the target cell; or, the terminal device stops accessing the first primary and secondary cell, and selects the cell that meets the S criterion among at least one candidate primary and secondary cell As the target cell.

If the target cell is the first primary and secondary cell, the terminal device continues to access the first primary and secondary cell, and performs an RRC re-establishment procedure with the first primary and secondary cell;

If the target cell is a cell that meets the S criterion among at least one candidate primary and secondary cell, the terminal device stops accessing the first primary and secondary cell (such as stopping the random access procedure with the first primary and secondary cell), and performs RRC reconfiguration with the target cell. Establish a process. Wherein, the process of the terminal device using at least one candidate primary and secondary cell that meets the S criterion as the target cell may refer to step 5031a, and the process of performing the RRC re-establishment process on the target cell by the terminal device may refer to the above step 5032a. No longer.

Step 605: The terminal device deletes/releases the first primary cell, and uses the first primary and secondary cell as the second primary cell.

For example, the terminal device may continue to access the first primary and secondary cell, and after successfully accessing the first primary and secondary cell, use the first primary and secondary cell as the second primary cell. Specifically, the terminal device may successfully access the first primary and secondary cell before successfully accessing the first primary and secondary cell, or after successfully accessing the first primary and secondary cell, or the terminal device may delete/release the first primary and secondary cell when successfully accessing the first primary and secondary cell. Main cell.

Specifically, the terminal device deletes/releases the first primary cell, and uses the first primary and secondary cell as the second primary cell. Refer to the terminal device’s deletion/release of the first primary cell in step 5033b and the target cell as the second primary cell. The process will not be repeated here.

Further optionally, after the terminal device uses the first primary and secondary cell as the second primary cell and successfully accesses the second primary cell, the network device corresponding to the second primary cell of the terminal device sends an instruction to indicate that RLF occurs in the first primary cell. For the related description of the instruction information, please refer to the description in step 5033b, which will not be repeated here. Further, after receiving the instruction information, the network device corresponding to the second primary cell can send a third message to the first primary network device. After the first primary network device receives the third message, the first primary network device disconnects from The connection of the terminal device no longer provides network services for the terminal device, and no longer transmits business data with the terminal device. Specifically, the relevant description of the third message, the process of sending the third message by the network device corresponding to the second primary cell, and the processing process after the first primary network device receives the third message can refer to the description in step 5033b, which will not be repeated here. .

Based on the method shown in Figure 6, after determining the target primary and secondary cell (i.e., the first primary and secondary cell) before accessing the target primary and secondary cell, in the scenario where RLF occurs in the first primary cell, the terminal device will determine the first primary and secondary cell. A primary and secondary cell as the target primary and secondary cell to be added, continue to access, or use the first primary and secondary cell or at least one candidate primary and secondary cell that meets the S criterion as the RRC reestablishment cell, and proceed on the first primary and secondary cell RRC re-establishment procedure, or use the first primary and secondary cell as the new primary cell. Since in the candidate PSCell addition preparation phase, the source PCell (i.e., the first primary cell) and at least one candidate PSCell have already exchanged the context information of the terminal device and forwarded the service data of the terminal device. Therefore, the terminal device can quickly Access the network equipment corresponding to the target cell to transmit service data, reduce the service interruption time between the terminal equipment and the network equipment, and ensure the service transmission between the terminal equipment and the network equipment.

The method shown in FIG. 5 is the communication method provided by this application in the scenario where RLF occurs in the first primary cell before the terminal device determines the target primary and secondary cell. The method shown in FIG. Before the secondary cell, the communication method in the scenario where RLF occurs in the first primary cell will be described. The following describes the communication system shown in Figure 3 and the method shown in Figure 7 as an example to determine the target primary and secondary cell for the terminal device and access the target After the primary and secondary cells, the communication method in the scenario where RLF occurs in the first primary cell is described:

Fig. 7 is a flowchart of a communication method provided by an embodiment of the application. As shown in Fig. 7, the method includes:

Step 701: The terminal device receives CPA information from the first main network device.

Wherein, step 701 can refer to the description of step 501, and will not be repeated.

Step 702: According to the CPA information, the terminal device determines a target primary and secondary cell that meets the primary and secondary cell addition condition from at least one candidate primary and secondary cell: the first primary and secondary cell, and successfully accesses the first primary and secondary cell.

Wherein, step 702 can refer to the prior art and will not be repeated.

Step 703: The terminal device detects that RLF occurs in the first primary cell, and the terminal device executes step 704 or step 705. Specifically, which step of step 704 or step 705 is performed by the terminal device may be pre-configured or stipulated by the protocol, or the network device may instruct the terminal device which step to perform, which is not limited.

For the process of the terminal device detecting that the RLF occurs in the first primary cell, reference may be made to step 502, which will not be repeated.

Step 704: The terminal device deletes/releases the first primary cell, and determines the first primary and secondary cell as the second primary cell.

For the process of deleting/releasing the first primary cell by the terminal equipment and using the first primary and secondary cell as the second primary cell, please refer to the process of deleting/releasing the first primary cell by the terminal equipment and using the target cell as the second primary cell in step 5033b. ,No longer.

Step 705: The terminal device receives the configuration information configured by the first primary network device through the network device corresponding to the first primary and secondary cell, and the configuration information is used to reconfigure the primary cell.

Wherein, step 705 can refer to the process in step 5032b in which the terminal device obtains the configuration information provided by the first primary network device for reconfiguring the primary cell through the network device corresponding to the target primary and secondary cell. For example, the terminal device successfully accesses the first primary cell. After a primary and secondary cell, the terminal device sends to the network device corresponding to the first primary and secondary cell indication information for indicating that RLF occurs in the first primary cell. After receiving the instruction information, the network device corresponding to the first primary and secondary cell can send a second message to the first primary network device. After the first primary network device receives the second message, the first primary network device disconnects from the terminal device. The connection, no longer provides network services for the terminal equipment, and no longer transmits business data with the terminal equipment. Optionally, after receiving the second message, the first primary network device reconfigures the new primary cell, and sends configuration information to the network device corresponding to the first primary and secondary cell, and the configuration information can be used to reconfigure the primary cell; After receiving the configuration information, the network device corresponding to the primary and secondary cell sends the configuration information to the terminal device; after receiving the configuration information, the terminal device attempts to change the primary cell from the first primary cell to the configuration information based on the configuration information The new primary cell indicated in.

Among them, the instruction information and the related description of the second message, the first primary network device configures the new primary cell, and the network device corresponding to the first primary and secondary cell (that is, the target primary and secondary cell) sends the second message to the first primary network device For the procedure and the processing procedure after the first primary network device receives the second message, and the procedure for the network device corresponding to the first primary and secondary cell (that is, the target primary and secondary cell) to send the configuration information corresponding to the new primary cell to the terminal device, please refer to The description in step 5032b will not be repeated.

Based on the method shown in Figure 7, the terminal device can obtain the new primary and secondary network equipment reconfigured by the first primary and secondary cell in the scenario where RLF occurs in the first primary cell after successfully accessing the target primary and secondary cell. Cell, or the first primary and secondary cell as the new primary cell. Since in the candidate PSCell adding preparation phase, the source PCell (i.e. the first primary cell) and at least one candidate PSCell have already exchanged the context information of the terminal device and forwarded the service data of the terminal device. Therefore, the terminal device can quickly Access the network equipment corresponding to the target cell to transmit service data, reduce the service interruption time between the terminal equipment and the network equipment, and ensure the service transmission between the terminal equipment and the network equipment.

The foregoing mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various nodes. It can be understood that, in order to realize the above-mentioned functions, each node, such as a network device and a terminal device, includes a hardware structure and/or software module corresponding to each function. Those skilled in the art should easily realize that in combination with the algorithm steps of the examples described in the embodiments disclosed herein, the method of the embodiments of the present application can be implemented in the form of hardware, software, or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of this application.

The embodiments of the present application can divide network devices and terminal devices into functional modules according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.

FIG. 8 shows a structural diagram of a communication device 80. The communication device 80 may be a terminal device, a chip in a terminal device, a system on a chip, or other devices that can implement the functions of the terminal device in the above method. The communication device 80 It can be used to perform the functions of the terminal device involved in the foregoing method embodiments. As an implementable manner, the communication device 80 shown in FIG. 8 includes: a receiving unit 801 and a processing unit 802;

In a possible design, the receiving unit 801 is configured to receive, from the first primary network device, CPA information indicating the parameters of at least one candidate primary and secondary cell and the primary and secondary cell addition condition information of each candidate primary and secondary cell. For example, the receiving unit 801 may support the communication device 80 to perform step 501.

The processing unit 802 is configured to detect the occurrence of RLF in the first primary cell before determining the cell that meets the primary and secondary cell addition conditions according to the CPA information, determine the target cell from at least one candidate primary and secondary cell, and add the target cell as the target For the primary and secondary cells, either perform a radio resource control RRC re-establishment procedure on the target cell, or delete the first primary cell, and use the target cell as the second primary cell. For example, the processing unit 802 may support the communication device 80 to perform step 502, step 5031a, step 5032a, step 5031b, step 5032b, step 5033b, step 5034b, step 5031c, step 5032c, step 5033c, and so on.

Specifically, all relevant content of each step involved in the method embodiment shown in FIG. 5 can be cited in the functional description of the corresponding functional module, and will not be repeated here. The communication device 80 is used to perform the functions of the terminal device in the communication method shown in the method shown in FIG. 5, and therefore can achieve the same effect as the above-mentioned communication method.

In a possible design, the processing unit 802 is configured to receive from the first primary network device the parameter indicating at least one candidate primary and secondary cell and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell, from At least one candidate primary and secondary cell determines the first primary and secondary cell that meets the primary and secondary cell addition conditions. If the terminal device detects that RLF occurs in the first primary and secondary cell before the terminal device successfully accesses the first primary and secondary cell, the first primary and secondary cell will be The cell is added as a target primary and secondary cell, or the target cell is determined, and the RRC re-establishment process is performed on the target cell, or the first primary cell is deleted, and the first primary and secondary cell is used as the second primary cell. For example, the processing unit 802 may support the communication device 80 to perform step 602, step 603, step 604, and step 605.

Specifically, all relevant content of each step involved in the method embodiment shown in FIG. 6 can be cited in the functional description of the corresponding functional module, which will not be repeated here. The communication device 80 is used to perform the functions of the terminal device in the communication method shown in the method shown in FIG. 6, and therefore can achieve the same effect as the above-mentioned communication method.

In a possible design, the processing unit 802 is configured to receive from the first primary network device the parameter indicating at least one candidate primary and secondary cell and the CPA information of the primary and secondary cell addition condition information of each candidate primary and secondary cell, from At least one candidate primary and secondary cell determines the first primary and secondary cell that satisfies the primary and secondary cell addition conditions. If RLF is detected in the first primary and secondary cell after successfully accessing the first primary and secondary cell, the first primary cell is deleted and the primary secondary cell is deleted. The first primary and secondary cell is determined to be the second primary cell; or, the configuration information configured by the first primary network device is received through a network device corresponding to the first primary and secondary cell, and the configuration information is used to reconfigure the primary cell. For example, the processing unit 802 may support the communication device 80 to perform step 702, step 703, step 704, and step 705.

Specifically, all relevant content of each step involved in the method embodiment shown in FIG. 7 can be cited in the functional description of the corresponding functional module, which will not be repeated here. The communication device 80 is used to perform the function of the terminal device in the communication method shown in the method shown in FIG. 7, and therefore can achieve the same effect as the above-mentioned communication method.

As yet another achievable manner, the communication device 80 shown in FIG. 8 includes: a processing module and a communication module. The processing module is used to control and manage the actions of the communication device 80. For example, the processing module can integrate the functions of the processing unit 802 and can be used to support the communication device 80 to perform steps 502, 5031a, 5032a, 5031b, 5032b, Step 5033b, step 5034b, step 5031c, step 5032c, step 5033c, step 602, step 603, step 604, step 605, step 702, step 703, step 704, step 705 and other processes of the technology described herein. The communication module can integrate the functions of the receiving unit 801, and can be used to support the communication device 80 to perform step 501 and communicate with other network entities, such as the communication with the functional module or network entities shown in FIG. 3. The communication device 80 may also include a storage module for storing instructions and/or data. When the instruction is executed by the processing module, the processing module implements the method executed by the above terminal device.

Among them, the processing module may be a processor, a controller, a module, or a circuit. It can implement or execute various exemplary logical blocks described in conjunction with the disclosure of this application. The communication module may be a transceiver circuit, a pin, an interface circuit, a bus interface, or a communication interface. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 80 involved in the embodiment of the present application may be the communication device shown in FIG. 4.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and may implement or Perform the methods, steps, and logical block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), for example Random-access memory (random-access memory, RAM). The memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this. The memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function for storing instructions and/or data.

FIG. 9 is a structural diagram of a communication system provided by an embodiment of this application. As shown in FIG. 9, the communication system may include: a terminal device 90 and multiple network devices 91. The terminal device 90 may be a terminal device that supports DC. The network device 91 may include a main network device connected to the terminal device 90 and an auxiliary network device to be added.

Wherein, the terminal device 90 may have the function of the above-mentioned communication device 80, which will not be repeated here.

Specifically, for the specific implementation process of the terminal device 90, refer to the execution process of the terminal device in the above-mentioned method embodiments of FIG. 5 to FIG. 7, and details are not described herein again.

The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the foregoing method embodiments may be completed by a computer program instructing relevant hardware. The program may be stored in the foregoing computer-readable storage medium. When the program is executed, it may include processes as in the foregoing method embodiments. . The computer-readable storage medium may be the terminal device of any of the foregoing embodiments, such as an internal storage unit including a data sending end and/or a data receiving end, such as a hard disk or memory of the terminal device. The computer-readable storage medium may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart media card (SMC), or a secure digital (SD) card equipped on the terminal device. Flash card, etc. Further, the aforementioned computer-readable storage medium may also include both an internal storage unit of the aforementioned terminal device and an external storage device. The aforementioned computer-readable storage medium is used to store the aforementioned computer program and other programs and data required by the aforementioned terminal device. The aforementioned computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

The embodiment of the present application also provides a computer instruction. All or part of the procedures in the foregoing method embodiments may be completed by computer instructions to instruct related hardware (such as computers, processors, network devices, and terminals). The program can be stored in the aforementioned computer-readable storage medium.

It should be noted that the terms "first" and "second" in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent in these processes, methods, products or equipment.

It should be understood that in this application, "at least one (item)" refers to one or more, "multiple" refers to two or more than two, and "at least two (item)" refers to two or three And three or more, "and/or" is used to describe the association relationship of the associated objects, indicating that there can be three kinds of relationships, for example, "A and/or B" can mean: only A, only B, and A at the same time And B three cases, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one (a) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c" ", where a, b, and c can be single or multiple.

It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A. For example, B can be determined from A. It should also be understood that determining B based on A does not mean that B is determined only based on A, and B can also be determined based on A and/or other information. In addition, the "connection" appearing in the embodiments of the present application refers to various connection modes such as direct connection or indirect connection to implement communication between devices, which is not limited in the embodiments of the present application.

Unless otherwise specified, "transmit/transmission" in the embodiments of the present application refers to two-way transmission, including sending and/or receiving actions. Specifically, the "transmission" in the embodiments of the present application includes the sending of data, the receiving of data, or the sending of data and the receiving of data. In other words, the data transmission here includes uplink and/or downlink data transmission. Data may include channels and/or signals. Uplink data transmission means uplink channel and/or uplink signal transmission, and downlink data transmission means downlink channel and/or downlink signal transmission. The "network" and "system" appearing in the embodiments of the present application express the same concept, and the communication system is the communication network.

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above-mentioned functional modules is used for illustration. In practical applications, the above-mentioned functions can be allocated according to needs. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be It can be combined or integrated into another device, or some features can be omitted or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and the parts displayed as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application are essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product, and the software product is stored in a storage medium. It includes several instructions to enable a device, such as a single-chip microcomputer, a chip, etc., or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application shall be covered by the protection scope of this application. . Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that it comprises:

Receiving, from the first primary network device, conditional primary and secondary cell addition CPA information, where the CPA information indicates parameters of at least one candidate primary and secondary cell and primary and secondary cell addition condition information of each candidate primary and secondary cell;

Before determining, according to the CPA information, a cell that satisfies the primary and secondary cell addition condition, it is detected that the first primary cell has a radio link failure RLF, and the first primary cell is managed by the first primary network device;

Determine a target cell from the at least one candidate primary and secondary cell;

Add the target cell as a target primary and secondary cell, or perform a radio resource control RRC re-establishment procedure on the target cell, or delete the first primary cell, and use the target cell as a second primary cell.
The method according to claim 1, wherein the determining the target cell comprises:

Taking a cell that meets the S criterion among the at least one candidate primary and secondary cell as the target cell.
The method according to claim 1, wherein the determining the target cell comprises:

Judging whether there is a cell that meets the first selection condition among the at least one candidate primary and secondary cell;

If there is a cell that meets the first selection condition among the at least one candidate primary and secondary cell, use the cell that meets the first selection condition as the target cell;

Wherein, the first selection condition is a primary and secondary cell addition condition, or the signal quality is greater than a first threshold.
The method according to claim 3, wherein the method further comprises:

If there is no cell that meets the first selection condition among the at least one candidate primary and secondary cell, a cell that meets the S criterion among the at least one candidate primary and secondary cell is used as the target cell.
The method according to claim 1, wherein the determining the target cell comprises:

During the valid period of the timer, determine whether there is a cell that meets the primary and secondary cell addition condition in the at least one candidate primary and secondary cell;

If there is a cell that meets the primary and secondary cell addition condition in the at least one candidate primary and secondary cell, the cell that meets the primary and secondary cell addition condition is used as the target cell.
The method according to claim 5, wherein the method further comprises:

If a cell that meets the primary and secondary cell addition condition is not determined within the validity period of the timer, or the timer expires, the cell that meets the second selection condition among the at least one candidate primary and secondary cell is used as the target For the cell, the second selection condition is the S criterion or the signal quality is greater than the second threshold.
The method according to any one of claims 1-6, wherein the method further comprises:

Send indication information to a network device corresponding to the target cell, where the indication information is used to indicate that RLF occurs in the first primary cell.
The method according to claim 7, wherein when the target cell is added as a target primary and secondary cell, the method further comprises:

Receiving configuration information from a network device corresponding to the target cell, where the configuration information is configured by the first primary network device, and the configuration information is used to reconfigure the primary cell.
A communication method, characterized in that the method includes:

According to the conditional primary and secondary cell addition CPA information received from the first primary network device, the first primary and secondary cell that meets the primary and secondary cell addition conditions is determined from at least one candidate primary and secondary cell, and the CPA information indicates the at least one candidate The parameters of the primary and secondary cells and the primary and secondary cell addition condition information of each candidate primary and secondary cell;

Before successfully accessing the first primary and secondary cell, it is detected that the first primary cell has a radio link failure RLF, and the first primary cell is managed by the first primary network device;

Add the first primary and secondary cell as a target primary and secondary cell, or determine a target cell, perform a radio resource control RRC re-establishment procedure on the target cell, or delete the first primary cell, and change the first primary cell The primary and secondary cell serve as the second primary cell.
The method according to claim 9, wherein the determining the target cell comprises:

Continue to access the first primary and secondary cell, and use the first primary and secondary cell as the target cell; or,

Stop accessing the first primary and secondary cell, and use a cell that meets the S criterion among the at least one candidate primary and secondary cell as the target cell.
The method according to claim 9 or 10, wherein the method further comprises:

Sending indication information, where the indication information is used to indicate that RLF occurs in the first primary cell.
The method according to claim 11, wherein when the first primary and secondary cell is added as a target primary and secondary cell, the sending instruction information comprises:

Sending the instruction information to the network device corresponding to the first primary and secondary cell;

The method further includes: receiving configuration information from a network device corresponding to the first primary and secondary cell, where the configuration information is configured by the first primary network device, and the configuration information is used to reconfigure the primary cell.
A communication device, characterized by being used to implement the communication method according to any one of claims 1-8.
A communication device, characterized by being used to implement the communication method according to any one of claims 9-12.
A communication system, characterized in that, the communication system includes:

A first main network device and a communication device for implementing the communication method according to any one of claims 1-8 or for implementing the communication method according to any one of claims 9-12.
A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions run on a computer, the computer executes the communication method according to any one of claims 1-8; Or, the processor is configured to execute the communication method according to any one of claims 9-12.
A computer program product, characterized by comprising: instructions, when the computer program product runs on a computer, causes the computer to execute the communication method according to any one of claims 1-8; or, causes the The computer executes the communication method according to any one of claims 9-12.