WO2020168913A1

WO2020168913A1 - Switching method, apparatus and communication device

Info

Publication number: WO2020168913A1
Application number: PCT/CN2020/074351
Authority: WO
Inventors: 刘亮; 胡南; 谢芳; 徐晓东
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2019-02-19
Filing date: 2020-02-05
Publication date: 2020-08-27
Also published as: CN111586773A

Abstract

The present disclosure provides a switching method, apparatus and a communication device. Provided is a switching method, which is applied to a source base station, including: sending RRC connection reconfiguration message to the terminal, the connection reconfiguration message including conditional switching configuration; when the preset data forwarding condition is satisfied, forwarding the data to the target base station and/or sending the No. SN status information to the target base station.

Description

Switching method, device and communication equipment

Cross references to related applications

This application claims the priority of Chinese Patent Application No. 201910124299.4 filed in China on February 19, 2019, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of wireless communication technology, in particular to a switching method, device and communication equipment.

Background technique

Handover (HO) is a key technology to ensure business continuity when the terminal moves from one cell to another cell or from one base station to another base station in the connected state. Normally, the handover process is through handover preparation and handover The three-stage process of execution and switching is completed.

The handover process is terminal-assisted, such as providing measurement results to the base station, but the handover decision is controlled by the network, and usually the base station uses the base station measurement results to determine that the terminal needs to be handed over to another base station before it initiates handover preparation. Interactive process.

There are some shortcomings in the switching method in the related art. For example, the handover decision is determined by the base station. The base station starts to interact with the target base station and negotiate resource configuration after determining the handover operation based on the measurement results of the terminal. The terminal is already moved because the terminal moves too fast or the air interface signal quality drops too fast due to fading. Loss of the connection of the base station of the same origin, which brings about the problem of poor user experience.

One of the proposed optimization techniques is Conditional HO. The main feature is that the serving base station negotiates with the target base station in advance, prepares relevant resources and configuration information in advance, and sends the information to the terminal in advance, and the terminal makes a decision to trigger the handover.

In order to ensure data lossless during the handover process, the source base station needs to perform data forwarding in addition to sending data to the terminal, that is, send the data to the target base station. However, in conditional handover, there is no relevant regulation as to when the source base station forwards data. Therefore, when the source base station forwards the data to the target base station and the corresponding process are key issues to be solved for conditional handover.

Summary of the invention

The technical problem to be solved by the present disclosure is to provide a switching method, device and communication equipment, which can solve the problem of data forwarding in the conditional switching process, making the switching process more robust, and being able to support new business requirements and deployment scenarios.

To solve the above technical problems, the embodiments of the present disclosure provide technical solutions as follows:

The embodiment of the present disclosure provides a handover method applied to a source base station, including:

Sending an RRC connection reconfiguration message to the terminal, where the connection reconfiguration message includes a conditional switching configuration;

When the preset data forwarding condition is met, forward the data to the target base station and/or send the SN status information to the target base station.

Optionally,

The data includes data that has not been confirmed by the terminal for successful transmission and/or unsent data and/or new data received from the core network.

Optionally,

The RRC connection reconfiguration message includes at least one of the following:

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

When the preset data forwarding condition is met, forwarding the data to the target base station and/or sending the SN number status information to the target base station includes:

Forwarding the sent data to the target base station while sending data to the terminal;

After the terminal completes the random access procedure with the target base station, it stops data interaction with the terminal, and sends the SN status information to the target base station.

Optionally,

Receiving the indication information sent by the terminal that condition switching has been triggered, the indication information indicating that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station;

Forward the data to the target base station and/or send the SN status information to the target base station.

Optionally,

The indication information that the condition switch has been triggered and sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.

Optionally,

In the case where it is determined that the terminal has triggered the conditional switching, forward the data to the target base station and/or send the SN status information to the target base station.

Optionally,

After receiving a conditional handover complete message or data forwarding indication information or a message that the terminal successfully accesses the target base station sent by the target base station, the data is forwarded to the target base station and/or the SN number status information is sent to the target base station.

Optionally,

Also includes:

Receiving an end flag sent by a core network element, where the end flag is sent after the core network element receives the path switching request of the target base station and completes the path switching;

Sending the end flag to the target base station;

Receiving the terminal context release message of the target base station.

The embodiment of the present disclosure also provides a handover device, which is applied to a source base station and includes a processor and a transceiver,

The transceiver is used to send an RRC connection reconfiguration message to the terminal, where the connection reconfiguration message includes a conditional switching configuration; when a preset data forwarding condition is met, forward the data to the target base station and/or forward the SN The number status information is sent to the target base station.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

The transceiver is specifically configured to forward the sent data to the target base station while sending data to the terminal; after the terminal completes the random access procedure with the target base station, stop data communication with the terminal Interactively, sending SN status information to the target base station.

Optionally,

The transceiver is specifically configured to receive the indication information sent by the terminal that the conditional switching has been triggered, the indication information indicating that the terminal has begun to establish a connection with the target base station or the terminal has stopped data interaction with the source base station; forwarding the data to The target base station and/or the SN number status information is sent to the target base station.

Optionally,

The transceiver is specifically configured to forward the data to the target base station and/or send the SN number status information to the target base station in the case of determining that the terminal has triggered the condition switching.

Optionally,

The transceiver is specifically configured to forward the data to the target base station and/or send the SN status information after receiving the conditional handover complete message or the indication information of data forwarding sent by the target base station or the terminal successfully accessing the target base station. Sent to the target base station.

Optionally,

The transceiver is also configured to receive an end flag sent by a core network element, where the end flag is sent after the core network element receives the path switching request of the target base station and completes the path switching; The flag is sent to the target base station; the terminal context release message of the target base station is received.

The embodiment of the present disclosure also provides a handover method applied to a terminal, including:

Receiving an RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes a conditional switching configuration;

In the case that the handover condition of the conditional handover is satisfied, the instruction information is sent to the source base station, and the instruction information indicates that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

Also includes:

Stop data interaction with the source base station.

Optionally,

The indication information is used to instruct the source base station to forward data to the target base station and/or send SN status information to the target base station.

Optionally,

The indication information sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.

Optionally,

The method also includes:

Send a radio resource control RRC reconfiguration complete message to the target base station.

The embodiment of the present disclosure also provides a switching device, which is applied to a terminal and includes a processor and a transceiver,

The transceiver is configured to receive an RRC connection reconfiguration message sent by a source base station, where the RRC connection reconfiguration message includes a conditional switching configuration;

The processor is configured to send indication information to the source base station when the handover conditions of the conditional handover are met, the indication information indicating that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

The transceiver is also used to stop data interaction with the source base station.

Optionally,

The transceiver is also used to send a radio resource control RRC reconfiguration complete message to the target base station.

The embodiment of the present disclosure also provides a handover method applied to a target base station, including:

Receive a radio resource control RRC reconfiguration complete message or random access preamble information or scheduled transmission information sent by the terminal;

Sending a conditional handover complete message or data forwarding indication information to the source base station or the terminal successfully accessing the target base station.

Optionally,

Also includes:

Receiving data forwarded by the source base station and/or receiving SN number status information of the source base station.

Optionally,

Also includes:

Send a path switching request to the core network element;

After receiving the feedback message of path switching completion, send a terminal context release message to the source base station.

Optionally,

Before the receiving the data forwarded by the source base station and/or receiving the SN number status information of the source base station, the method further includes:

Receiving a radio resource control RRC reconfiguration complete message sent by the terminal or receiving random access preamble information or scheduling transmission information;

Sending a condition handover complete message or data forwarding indication information or the terminal successfully accessing the target base station to the source base station.

The embodiment of the present disclosure also provides a handover device, which is applied to a target base station and includes a processor and a transceiver,

The transceiver is used for receiving a radio resource control RRC reconfiguration complete message or random access preamble information or scheduling transmission information sent by the terminal; sending a condition switching complete message or data forwarding indication information to the source base station or the terminal successfully accessing the target Base station indication information.

Optionally,

The transceiver is also used for receiving unsuccessfully transmitted data and new data forwarded by the source base station and/or receiving SN status information of the source base station.

Optionally,

The transceiver is also used to send a path switching request to a core network element; after receiving a feedback message that the path switching is complete, send a terminal context release message to the source base station.

Optionally,

The transceiver is also used for receiving a radio resource control RRC reconfiguration complete message sent by the terminal or receiving random access preamble information or scheduling transmission information; sending a condition switching complete message or data forwarding indication information to the source base station or The terminal successfully accesses the target base station indication information.

The embodiment of the present disclosure also provides a communication device, including: a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The computer program is executed by the processor to realize the above Switch the steps in the method.

The embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps in the switching method described above are implemented.

The present disclosure has the following beneficial effects:

In the above solution, the source base station sends an RRC connection reconfiguration message to the terminal, and when a preset data forwarding condition is met, forwards the data to the target base station and/or sends the SN number status information to the target base station. Through the technical solution of the present disclosure, the problem of data forwarding in the conditional switching process can be solved, the repeated transmission of data between the source base station and the target base station is effectively avoided, and the interruption time delay of terminal data is reduced, making the switching process more robust and capable New business requirements and deployment scenarios.

Description of the drawings

FIG. 1 is one of the schematic flowcharts of the switching method according to the embodiment of the disclosure;

2 is one of the structural block diagrams of the switching device according to the embodiment of the disclosure;

FIG. 3 is the second schematic diagram of the flow of the switching method according to the embodiment of the disclosure;

4 is the second structural block diagram of the switching device according to the embodiment of the disclosure;

FIG. 5 is the third schematic flowchart of the switching method according to the embodiment of the disclosure;

6 is the third structural block diagram of the switching device according to the embodiment of the disclosure;

FIG. 7 is a schematic diagram of signaling interaction between network elements in Embodiment 1 of the disclosure;

8 is a schematic flowchart of a handover method in Embodiment 2 of the disclosure;

9 is a schematic flowchart of a handover method in Embodiment 3 of the disclosure;

FIG. 10 is a schematic flowchart of a handover method in Embodiment 4 of the present disclosure.

detailed description

In order to make the technical problems, technical solutions, and advantages to be solved by the embodiments of the present disclosure clearer, a detailed description will be given below in conjunction with the drawings and specific embodiments.

The embodiments of the present disclosure provide a handover method, device and communication equipment, which can solve the problem of data forwarding in the conditional handover process, make the handover process more robust, and can support new business requirements and deployment scenarios.

The embodiment of the present disclosure provides a handover method, which is applied to a source base station, as shown in FIG. 1, including:

Step 101: Send an RRC connection reconfiguration message to the terminal, where the connection reconfiguration message includes conditional switching configuration;

Step 102: When the preset data forwarding condition is met, forward the data to the target base station and/or send the SN status information to the target base station.

In this embodiment, the source base station sends an RRC connection reconfiguration message to the terminal, and when the preset data forwarding conditions are met, the data is forwarded to the target base station and/or the SN number status information is sent to the target base station . Through the technical solution of the present disclosure, the problem of data forwarding in the conditional switching process can be solved, the repeated transmission of data between the source base station and the target base station is effectively avoided, and the interruption time delay of terminal data is reduced, making the switching process more robust and capable New business requirements and deployment scenarios.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

In a specific embodiment, the forwarding data to the target base station and/or sending the SN number status information to the target base station under the condition that a preset data forwarding condition is met includes:

In a specific embodiment, the indication information that the conditional switch has been triggered and sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.

Optionally, this embodiment further includes:

Sending the end flag to the target base station;

Receiving the terminal context release message of the target base station.

The embodiment of the present disclosure also provides a handover device, which is applied to a source base station, as shown in FIG. 2, which includes a processor 11 and a transceiver 12.

The transceiver 12 is configured to send an RRC connection reconfiguration message to the terminal, where the connection reconfiguration message includes a conditional switching configuration; when a preset data forwarding condition is met, the data is forwarded to the target base station and/or Send the SN status information to the target base station.

In this embodiment, the source base station sends an RRC connection reconfiguration message to the terminal; if the preset data forwarding conditions are met, the data is forwarded to the target base station and/or the SN number status information is sent to the target base station . Through the technical solution of the present disclosure, the problem of data forwarding in the conditional switching process can be solved, the repeated transmission of data between the source base station and the target base station is effectively avoided, and the interruption time delay of terminal data is reduced, making the switching process more robust and capable New business requirements and deployment scenarios.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

The transceiver 12 is specifically configured to forward the sent data to the target base station while sending data to the terminal; after the terminal completes the random access procedure with the target base station, stop communication with the terminal Data exchange, sending SN status information to the target base station.

Optionally,

The transceiver 12 is specifically configured to receive the indication information sent by the terminal that the conditional switching has been triggered, the indication information indicating that the terminal has begun to establish a connection with the target base station or the terminal has stopped data interaction with the source base station; forwarding the data To the target base station and/or send SN status information to the target base station.

Optionally,

The transceiver 12 is specifically configured to forward the data to the target base station and/or send the SN number status information to the target base station when it is determined that the terminal has triggered the condition switching.

Optionally,

The transceiver 12 is specifically configured to forward the data to the target base station and/or set the SN number status after receiving a conditional handover complete message or data forwarding indication information sent by the target base station or a message that the terminal successfully accesses the target base station The information is sent to the target base station.

Optionally,

The transceiver 12 is also configured to receive an end flag sent by a core network element, where the end flag is sent after the core network element receives the path switching request of the target base station and completes the path switching; The end flag is sent to the target base station; the terminal context release message of the target base station is received.

The embodiment of the present disclosure also provides a handover method, which is applied to a terminal, as shown in FIG. 3, including:

Step 201: Receive a conditional switching instruction sent by a source base station, where the RRC connection reconfiguration message includes a conditional switching configuration;

Step 202: When the handover conditions of the conditional handover are met, send indication information to the source base station, the indication information indicating that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

Also includes:

Stop data interaction with the source base station.

Optionally,

The method also includes:

The embodiment of the present disclosure also provides a switching device, which is applied to a terminal, as shown in FIG. 4, including a processor 21 and a transceiver 22,

The transceiver 22 is configured to receive an RRC connection reconfiguration message sent by a source base station, where the RRC connection reconfiguration message includes a conditional switching configuration;

The processor 21 is configured to send indication information to the source base station when the handover conditions of the conditional handover are met, the indication information indicating that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station.

Optionally,

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.

Optionally,

The transceiver 22 is also used to stop data interaction with the source base station.

Optionally,

The transceiver 22 is also used to send a radio resource control RRC reconfiguration complete message to the target base station.

The embodiment of the present disclosure also provides a handover method applied to a target base station, as shown in FIG. 5, including:

Step 301: Receive a radio resource control RRC reconfiguration complete message or random access preamble information or scheduled transmission information sent by the terminal;

Step 302: Send a condition handover complete message or data forwarding indication information or the terminal successfully accessing the target base station to the source base station.

Optionally,

Also includes:

Optionally,

Also includes:

Send a path switching request to the core network element;

Optionally,

The embodiment of the present disclosure also provides a handover device, which is applied to a target base station, as shown in FIG. 6, including a processor 31 and a transceiver 32,

The transceiver 32 is configured to receive a radio resource control RRC reconfiguration complete message or random access preamble information or scheduling transmission information sent by the terminal; send a condition switching complete message or data forwarding indication information to the source base station or the terminal to successfully connect Enter the target base station indication information.

Optionally,

The transceiver 32 is also used for receiving unsuccessfully transmitted data and new data forwarded by the source base station and/or receiving SN status information of the source base station.

Optionally,

The transceiver 32 is also configured to send a path switching request to the core network element; after receiving a feedback message that the path switching is completed, send a terminal context release message to the source base station.

Optionally,

The transceiver 32 is also configured to receive a radio resource control RRC reconfiguration complete message sent by the terminal or receive random access preamble information or scheduling transmission information; send a condition switching complete message or data forwarding indication information to the source base station Or the terminal successfully accesses the target base station indication information.

The technical solutions of the present disclosure will be further introduced below in conjunction with the drawings and specific embodiments.

As shown in Figure 7, the signaling interaction of each network element in this embodiment includes the following steps:

The source base station sends to the terminal the parameters used for conditional HO measurement and reporting, which are included in the radio resource configuration message (RRC Con Reconfig), and receives the configuration feedback message (RRC Con Reconfig Com);

When the conditional HO measurement event reporting condition is met, the terminal reports the measurement result;

The source base station decides whether to configure conditional HO for a UE and selects the target cell;

The handover request sent by the source base station to the target base station carries a conditional HO indication, which is used to inform the target base station that the current handover request is conditional HO, and assist the target base station in admission control and feedback corresponding parameters and configurations;

If the target base station accepts it, the returned HO Request ACK carries handover command information, including bearer configuration, random access channel (Random Access Channel, RACH) configuration and other information, and may also include conditional HO indications and/or conditional HO triggering conditions;

The source base station sends an RRC reconfiguration message to the terminal, directly forwards the HOcommand message or adds a conditional HO indication and/or conditional HO triggering condition. The data forwarding scheme executed afterwards may include the following embodiments.

In the implementation of the data forwarding scheme of Liyi, as shown in Figure 7, the source base station sends data to the terminal while sending the unsuccessfully transmitted data and new data to the target base station; the terminal meets the conditional HO conditions to trigger handover and complete random access Process; the source base station determines to stop and the terminal to send/receive data, and sends the service node (SN) status information to the target base station; the target base station sends a path switch request to the core network; after the path switch is completed, the core network sends to the source base station End marker, the source base station forwards the end marker to the target base station; after receiving the feedback message that the path switching is completed, the target base station sends a UE context release message to the source base station.

In the data forwarding scheme of the second embodiment, as shown in Figure 8, after receiving the reconfiguration message sent by the source base station, the terminal does not stop data transmission with the source base station. When the terminal determines that the conditional HO handover condition is met, it sends the source base station Sending an indication that the HO request has been triggered, the terminal then initiates a random access procedure to the target base station. Upon receiving the indication, the source base station can start data forwarding to the target base station and/or send SN status (status) information.

In the data forwarding scheme of the third embodiment, as shown in FIG. 9, the terminal does not stop data transmission with the source base station after receiving the reconfiguration message sent by the source base station; the terminal then initiates a random access process to the target base station; The base station judges that the current terminal has triggered conditional HO. For example, based on implementation, all data transmission is unsuccessful within a certain period of time, and can start to perform data forwarding to the target base station and/or send SN status information.

In the data forwarding scheme of the fourth embodiment, as shown in FIG. 10, the terminal does not stop data transmission with the source base station after receiving the reconfiguration message sent by the source base station; the terminal then initiates a random access process to the target base station; When the target base station receives the RRC reconfiguration complete message sent by the terminal or receives the message 1/3, it sends the conditional HO complete or data forwarding instruction to the source base station. After receiving the information, the source base station can start to perform the forwarding Data forwarding of the target base station, and/or sending SN status information.

The technical solution of this embodiment can solve the problem of data forwarding in the conditional switching process, making the switching process more robust, and being able to support new business requirements and deployment scenarios.

It can be understood that the embodiments described herein can be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more Application Specific Integrated Circuits (ASIC), Digital Signal Processing (DSP), Digital Signal Processing Equipment (DSP Device, DSPD), programmable Logic device (Programmable Logic Device, PLD), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), general-purpose processors, controllers, microcontrollers, microprocessors, and others for performing the functions described in this application Electronic unit or its combination.

For software implementation, the technology described herein can be implemented through modules (such as procedures, functions, etc.) that perform the functions described herein. The software codes can be stored in the memory and executed by the processor. The memory can be implemented in the processor or external to the processor.

The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

Those skilled in the art should understand that the embodiments of the embodiments of the present disclosure may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present disclosure may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present disclosure may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

The embodiments of the present disclosure are described with reference to flowcharts and/or block diagrams of methods, user equipment (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing user equipment processors to generate a machine, so that the computer or other programmable data processing user equipment processors execute instructions A device for realizing the functions specified in one flow or multiple flows in the flowchart and/or one block or multiple blocks in the block diagram is generated.

These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing user equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The instruction device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing user equipment, so that a series of operation steps are executed on the computer or other programmable user equipment to produce computer-implemented processing, so that the computer or other programmable user equipment The instructions executed above provide steps for implementing functions specified in one or more processes in the flowchart and/or one or more blocks in the block diagram.

Although the optional embodiments of the embodiments of the present disclosure have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted as including alternative embodiments and all changes and modifications falling within the scope of the embodiments of the present disclosure.

It should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations There is any such actual relationship or order between. Moreover, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or user equipment including a series of elements not only includes those elements, but also includes those elements that are not explicitly listed. Other elements listed, or also include elements inherent to this process, method, article, or user equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of another same element in the process, method, article or user equipment that includes the element.

The above are optional implementations of the present disclosure. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles of the present disclosure, and these improvements and modifications are also Within the protection scope of this disclosure.

Claims

A handover method, applied to a source base station, includes:

Sending an RRC connection reconfiguration message to the terminal, where the connection reconfiguration message includes a conditional switching configuration;

When the preset data forwarding condition is met, forward the data to the target base station and/or send the SN status information to the target base station.
The handover method according to claim 1, wherein the data includes data that has not been successfully transmitted and/or unsent data and/or new data received from the core network without confirmation by the terminal.
The handover method according to claim 1, wherein the RRC connection reconfiguration message includes at least one of the following:

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.
The handover method according to claim 1, wherein said forwarding data to the target base station and/or sending SN number status information to the target base station in the case that a preset data forwarding condition is met comprises:

Forwarding the sent data to the target base station while sending data to the terminal;

After the terminal completes the random access procedure with the target base station, it stops data interaction with the terminal, and sends the SN status information to the target base station.
The handover method according to claim 1, wherein said forwarding data to the target base station and/or sending SN number status information to the target base station in the case that a preset data forwarding condition is met comprises:

Receiving the indication information sent by the terminal that condition switching has been triggered, the indication information indicating that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station;

Forward the data to the target base station and/or send the SN status information to the target base station.
The handover method according to claim 5, wherein the indication information that the conditional handover has been triggered and sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.
The handover method according to claim 1, wherein said forwarding data to the target base station and/or sending SN number status information to the target base station in the case that a preset data forwarding condition is met comprises:

In the case where it is determined that the terminal has triggered the conditional switching, forward the data to the target base station and/or send the SN status information to the target base station.
The handover method according to claim 1, wherein said forwarding data to the target base station and/or sending SN number status information to the target base station in the case that a preset data forwarding condition is met comprises:

After receiving a conditional handover complete message or data forwarding indication information or a message that the terminal successfully accesses the target base station sent by the target base station, the data is forwarded to the target base station and/or the SN number status information is sent to the target base station.
The handover method according to claim 1, further comprising:

Receiving an end flag sent by a core network element, where the end flag is sent after the core network element receives the path switching request of the target base station and completes the path switching;

Sending the end flag to the target base station;

Receiving the terminal context release message of the target base station.
A switching device applied to a source base station, including a processor and a transceiver,

The transceiver is used to send an RRC connection reconfiguration message to the terminal, where the connection reconfiguration message includes a conditional switching configuration; when a preset data forwarding condition is met, forward the data to the target base station and/or forward the SN The number status information is sent to the target base station.
The switching device according to claim 10, wherein the data includes data that has not been confirmed by the terminal for successful transmission and/or unsent data and/or new data received from the core network.
The handover device according to claim 10, wherein the RRC connection reconfiguration message includes at least one of the following:

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.
The switching device according to claim 10, wherein:

The transceiver is specifically configured to forward the sent data to the target base station while sending data to the terminal; after the terminal completes the random access procedure with the target base station, stop data communication with the terminal Interactively, sending SN status information to the target base station.
The switching device according to claim 10, wherein:

The transceiver is specifically configured to receive the indication information sent by the terminal that the conditional switching has been triggered, the indication information indicating that the terminal has begun to establish a connection with the target base station or the terminal has stopped data interaction with the source base station; forwarding the data to The target base station and/or the SN number status information is sent to the target base station.
The handover device according to claim 14, wherein the indication information that the conditional handover has been triggered and sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.
The switching device according to claim 10, wherein:

The transceiver is specifically configured to forward the data to the target base station and/or send the SN number status information to the target base station in the case of determining that the terminal has triggered the condition switching.
The switching device according to claim 10, wherein:

The transceiver is specifically configured to forward the data to the target base station and/or send the SN status information after receiving the conditional handover complete message or the indication information of data forwarding sent by the target base station or the terminal successfully accessing the target base station. Sent to the target base station.
The switching device according to claim 10, wherein:

The transceiver is also configured to receive an end flag sent by a core network element, where the end flag is sent after the core network element receives the path switching request of the target base station and completes the path switching; The flag is sent to the target base station; the terminal context release message of the target base station is received.
A handover method, applied to a terminal, includes:

Receiving an RRC connection reconfiguration message sent by the source base station, where the RRC connection reconfiguration message includes a conditional switching configuration;

In the case that the handover condition of the conditional handover is satisfied, the instruction information is sent to the source base station, and the instruction information indicates that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station.
The handover method according to claim 19, wherein the RRC connection reconfiguration message includes at least one of the following:

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.
The handover method according to claim 19, further comprising:

Stop data interaction with the source base station.
The handover method according to claim 19, wherein the indication information is used to instruct the source base station to forward data to the target base station and/or send SN status information to the target base station.
The handover method according to claim 22, wherein the indication information sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.
The handover method according to claim 19, further comprising:

Send a radio resource control RRC reconfiguration complete message to the target base station.
A switching device applied to a terminal, including a processor and a transceiver,

The transceiver is configured to receive an RRC connection reconfiguration message sent by a source base station, where the RRC connection reconfiguration message includes a conditional switching configuration;

The processor is configured to send indication information to the source base station when the handover conditions of the conditional handover are met, the indication information indicating that the terminal has started to establish a connection with the target base station or the terminal has stopped data interaction with the source base station.
The handover device according to claim 25, wherein the RRC connection reconfiguration message includes at least one of the following:

Mobility control information;

Wireless resource configuration information;

Random access resource configuration information;

Indication of condition switching;

The trigger condition of the condition switch.
The handover device according to claim 25, wherein the transceiver is also used to stop data interaction with the source base station.
The handover device according to claim 25, wherein the indication information is used to instruct the source base station to forward data to the target base station and/or to send SN status information to the target base station.
The handover device according to claim 28, wherein the indication information sent by the terminal is sent through a physical channel or MAC layer signaling or control PDU or RRC layer signaling.
The handover device according to claim 25, wherein the transceiver is further configured to send a radio resource control RRC reconfiguration complete message to the target base station.
A handover method, applied to a target base station, includes:

Receive a radio resource control RRC reconfiguration complete message or random access preamble information or scheduled transmission information sent by the terminal;

Sending a conditional handover complete message or data forwarding indication information to the source base station or the terminal successfully accessing the target base station.
The handover method according to claim 31, further comprising:

Receiving data forwarded by the source base station and/or receiving SN number status information of the source base station.
The handover method according to claim 32, wherein the data includes data that has not been confirmed by the terminal for successful transmission and/or unsent data and/or new data received from the core network.
The handover method according to claim 32, further comprising:

Send a path switching request to the core network element;

After receiving the feedback message of path switching completion, send a terminal context release message to the source base station.
The handover method according to claim 32, wherein before the receiving the data forwarded by the source base station and/or receiving the SN number status information of the source base station, the method further comprises:

Receiving a radio resource control RRC reconfiguration complete message sent by the terminal or receiving random access preamble information or scheduling transmission information;

Sending a condition handover complete message or data forwarding indication information or the terminal successfully accessing the target base station to the source base station.
A switching device applied to a target base station, including a processor and a transceiver,

The transceiver is used for receiving a radio resource control RRC reconfiguration complete message or random access preamble information or scheduling transmission information sent by the terminal; sending a condition switching complete message or data forwarding indication information to the source base station or the terminal successfully accessing the target Base station indication information.
The switching device according to claim 36, wherein:

The transceiver is also used for receiving unsuccessfully transmitted data and new data forwarded by the source base station and/or receiving SN status information of the source base station.
The switching device according to claim 37, wherein the data includes data that has not been confirmed by the terminal for successful transmission and/or unsent data and/or new data received from the core network.
The handover device according to claim 36, wherein the transceiver is further configured to send a path switching request to a core network element; after receiving a path switching completion feedback message, send a terminal context release message to the source base station .
The switching device according to claim 36, wherein:

The transceiver is also used for receiving a radio resource control RRC reconfiguration complete message sent by the terminal or receiving random access preamble information or scheduling transmission information; sending a condition switching complete message or data forwarding indication information to the source base station or The terminal successfully accesses the target base station indication information.
A communication device, comprising: a memory, a processor, and a computer program stored on the memory and capable of running on the processor. The computer program is executed by the processor to realize the implementation as defined in any one of claims 1 to 9. The steps in the switching method may implement the steps in the switching method according to any one of claims 19 to 24 or the steps in the switching method according to any one of claims 31 to 35.
A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the switching method according to any one of claims 1 to 9 are realized Or implement the steps in the handover method according to any one of claims 19 to 24 or implement the steps in the handover method according to any one of claims 31 to 35.