CN111586766A

CN111586766A - Communication method, device and system

Info

Publication number: CN111586766A
Application number: CN201910118048.5A
Authority: CN
Inventors: 王瑞; 曾清海; 戴明增
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2020-08-25
Anticipated expiration: 2039-02-15
Also published as: WO2020164436A1; CN111586766B

Abstract

The embodiment of the application discloses a communication method, a communication device and a communication system, relates to the technical field of communication, and can solve the problems of long time consumption and low configuration rate of a terminal configuration target station. The communication method is applied to a communication system comprising a first subsystem and a second subsystem, wherein the first subsystem comprises a source main station and a source auxiliary station, the source main station and the source auxiliary station provide services for terminals, the second subsystem comprises a target main station, and the network type of the target main station is the same as that of the source auxiliary station. Specifically, a source master station sends a switching request message including network system information of a source auxiliary station to a target master station, and the switching request message is used for requesting to switch a terminal to the target master station; correspondingly, the source main station receives a switching command from the target main station, wherein the switching command is used for indicating that a main cell group MCG of the target main station is configured according to the configuration information of an auxiliary cell group SCG of the source auxiliary station; subsequently, the source master station sends the switching command to the terminal.

Description

Communication method, device and system

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a communication method, device and system.

Background

In a Dual Connectivity (DC) communication system, a User Equipment (UE) may transmit data through a Master Cell Group (MCG) and a Secondary Cell Group (SCG). If the source MCG fails or the current communication quality is poor, the terminal may release the communication with the source primary station (MN) and the source secondary Station (SN), and delete the configuration information of the source SCG. The terminal may then reconfigure the target station (e.g., the base station/source MN serving the reselected cell to determine the target base station to which to handover the terminal) to communicate with the target base station.

However, in the above method, the process time of the terminal configuring the target station is long, and the configuration rate is low, which reduces the communication rate.

Disclosure of Invention

The embodiment of the application provides a communication method, a communication device and a communication system, and solves the problems of long time consumption, low configuration rate and low communication rate of a terminal configuration target station.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, a communication method is provided, where the communication method is applied to a communication system including a first subsystem (the subsystem includes a source primary station and a source secondary station for providing services for a terminal) and a second subsystem (the subsystem includes a target primary station capable of providing services for the terminal, and a network format of the target primary station is the same as a network format of the source secondary station). Specifically, a source master station sends a switching request message including network system information of a source auxiliary station to a target master station, and the switching request message is used for requesting to switch a terminal to the target master station; subsequently, the source master station receives a handover command from the target master station and sends the handover command to the terminal, wherein the handover command is used for instructing to configure the MCG of the target master station according to the configuration information of the SCG of the source secondary station.

In the application, the configuration of the MCG of the target master station is performed according to the configuration information of the SCG of the source secondary station, and compared with the prior art in which the target master station needs to be reconfigured, the embodiment of the application effectively reduces time consumption and improves configuration rate and communication rate.

Optionally, in a possible implementation manner of the present application, the handover command includes first configuration increment information; the first configuration increment information is used for configuring the MCG of the target main station by combining the configuration information of the SCG of the source auxiliary station; alternatively, the handover command includes first indication information indicating that the configuration information of the SCG of the source secondary station is the configuration information of the MCG of the target primary station.

In a scenario where the handover command is used to instruct the MCG of the target primary station to be configured according to the configuration information of the SCG of the source secondary station, the handover command may be embodied in various forms.

Optionally, in another possible implementation manner of the present application, the handover request message further includes information of a network type of the source master station, and the second subsystem further includes the target secondary station, where the network type of the target secondary station is the same as the network type of the source master station. In this scenario, the handover command is also used to instruct the target secondary station to configure the SCG according to the configuration information of the MCG of the source primary station.

In the scene that the network system of the target auxiliary station is the same as that of the source main station, the SCG of the target auxiliary station is configured based on the configuration information of the MCG of the source main station, so that the time consumption is effectively reduced, and the configuration rate and the communication rate are improved.

Optionally, in another possible implementation manner of the present application, if the handover command is further used to instruct to configure the SCG of the target secondary station according to the configuration information of the MCG of the source primary station, the handover command further includes second configuration increment information, where the second configuration increment information is used to configure the SCG of the target secondary station in combination with the configuration information of the MCG of the source primary station; or, the handover command includes second indication information indicating that the configuration information of the MCG of the source primary station is used as the configuration information of the SCG of the target secondary station.

The handover command in the present application may be embodied in various forms.

Optionally, in another possible implementation manner of the present application, the handover command further includes a release indication or capability information, where the release indication is used to indicate that the configured SRB3 is released, and the capability information is used to indicate that the target secondary station does not support the SRB 3.

In a 5G dual connectivity communication system, the secondary station may be configured with an SRB 3. And if the target secondary station does not support the SRB3, the target primary station informs the terminal to release the configured SRB 3.

Optionally, in another possible implementation manner of the present application, before the source primary station sends the handover request message to the target primary station, the source primary station further obtains the target report, or receives information of the target primary station from the source secondary station. The target report includes a measurement report, or includes MCG failure information and a measurement report, where the MCG failure information is used to indicate MCG failure of the source primary station, and the measurement report is a report measured based on measurement configuration information sent by the source primary station or the source secondary station. The information of the target master station comprises an identifier of the target master station, or comprises an identifier of the target master station and an identifier of a target cell, wherein the target cell is a main service cell after the terminal is switched to the target master station.

The source primary station can determine the information of the target primary station according to the target report and can also receive the information of the target primary station from the source secondary station. The communication method provided by the application is suitable for a scene of MCG failure, and also suitable for a scene that the MCG fails, and a source main station or a source auxiliary station determines to switch the terminal to a target main station directly according to a measurement report sent by the terminal.

Optionally, in another possible implementation manner of the present application, the method for the source master station to obtain the target report includes: the source primary station receives a target report from the source secondary station; alternatively, the source master receives the target report from the terminal through the split SRB.

The source primary station can acquire the target report through the split SRB, and can also acquire the target report through communication with the source secondary station.

Optionally, in another possible implementation manner of the present application, the method for the source master station to send the handover command to the terminal includes: the source master station sends a switching command to the terminal through the source auxiliary station; or the source master station sends a switching command to the terminal through the split SRB.

And if the source main station is configured with the split SRB, the source main station communicates with the terminal through the split SRB without sensing and analyzing a switching command by the source auxiliary station.

Optionally, in another possible implementation manner of the present application, the source secondary station is configured with an SRB3, and the split SRB is established by the SRB3 for the terminal.

Optionally, in another possible implementation manner of the present application, the target primary station and the source secondary station are the same device.

In a second aspect, a communication device is provided, which is capable of implementing the functions of the first aspect and any one of its possible implementations. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible implementation manner of the present application, the communication device may include a sending unit and a receiving unit, and the sending unit and the receiving unit may perform corresponding functions in the communication method of the first aspect and any one of the possible implementation manners thereof. For example: a sending unit, configured to send a handover request message to a target master station, where the handover request message is used to request a terminal to be handed over to the target master station, and the handover request message includes network type information of the source slave station; a receiving unit, configured to receive a handover command from a target master station, where the handover command is used to instruct to configure an MCG of the target master station according to configuration information of an SCG of the source secondary station; and the sending unit is also used for sending the switching command to the terminal.

In a third aspect, a communication device is provided, which includes a processor, which is coupled to a memory, and is configured to read and execute instructions in the memory to implement the communication method according to the first aspect and any one of the possible implementation manners thereof.

Optionally, the communication device may further include a memory for storing program instructions and data for the communication device. Further optionally, the communication device may further include a transceiver, configured to perform, under control of a processor of the communication device, the steps of transceiving data, signaling, or information in the communication method according to the first aspect and any one of the possible implementation manners of the first aspect, for example, sending a handover request message and receiving a handover command.

Optionally, the communication device may be the source master station, or may be a part of the source master station, for example, a system-on-chip in the source master station. The system-on-chip is adapted to support the sourcing master station to implement the functions referred to in the first aspect and any one of its possible implementations, e.g. to receive, transmit or process data and/or information referred to in the above-mentioned communication method. The chip system includes a chip and may also include other discrete devices or circuit structures.

In a fourth aspect, there is also provided a computer-readable storage medium having instructions stored therein; which when run on a communication device causes the communication device to perform a communication method as described above in the first aspect and its various possible implementations.

In a fifth aspect, there is also provided a computer program product comprising instructions which, when run on a communication apparatus, cause the communication apparatus to perform the communication method as described in the first aspect and its various possible implementations.

It should be noted that all or part of the above instructions may be stored on the first computer storage medium, where the first computer storage medium may be packaged together with the processor or may be packaged separately from the processor, and this application is not limited in this respect.

For a detailed description of the second, third, fourth, fifth and their various implementations in this application, reference may be made to the detailed description of the first aspect and its various implementations; moreover, the beneficial effects of the second aspect, the third aspect, the fourth aspect, the fifth aspect and various implementation manners thereof may refer to the beneficial effect analysis of the first aspect and various implementation manners thereof, and are not described herein again.

In a sixth aspect, a communication method is provided, which is applied to a communication system including a first subsystem (the subsystem includes a source primary station and a source secondary station for providing services for terminals) and a second subsystem (the subsystem includes a target primary station capable of providing services for terminals, and a network format of the target primary station is the same as a network format of the source secondary station). Specifically, a target master station receives a switching request message from a source master station, where the switching request message is used to request a terminal to be switched to the target master station, and the switching request message includes network system information of a source auxiliary station; subsequently, if the target master station reserves resources for the terminal, the target master station sends a switching command to the source master station, and the switching command is used for indicating to configure the MCG of the target master station according to the configuration information of the SCG of the source auxiliary station.

And the switching command sent by the target main station is used for indicating the configuration of the MCG of the target main station according to the configuration information of the SCG of the source auxiliary station, and the subsequent terminal can configure the MCG of the target main station according to the configuration information of the SCG of the source auxiliary station after acquiring the switching command. Compared with the prior art that the target master station needs to be reconfigured, the method and the device for configuring the target master station effectively reduce time consumption and improve configuration rate and communication rate.

A seventh aspect provides a communication device capable of implementing the functions of the sixth aspect and any one of its possible implementations. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible implementation manner of the present application, the communication device may include a transmitting unit and a receiving unit, and the transmitting unit and the receiving unit may perform corresponding functions in the communication method of the sixth aspect and any one of the possible implementation manners thereof. For example: the system comprises a receiving unit, a switching unit and a switching unit, wherein the receiving unit is used for receiving a switching request message from a source main station, the switching request message is used for requesting to switch a terminal to a target main station, and the switching request message comprises network type information of a source auxiliary station; and the sending unit is used for sending a switching command to the source main station if the target main station reserves resources for the terminal, wherein the switching command is used for indicating the MCG of the target main station to be configured according to the configuration information of the SCG of the source auxiliary station.

In an eighth aspect, a communication device is provided, which includes a processor, which is coupled to a memory, and configured to read and execute instructions in the memory to implement the communication method according to the sixth aspect and any one of the possible implementation manners.

Optionally, the communication device may further include a memory for storing program instructions and data for the communication device. Further optionally, the communication device may further include a transceiver, configured to perform, under the control of the processor of the communication device, the steps of transceiving data, signaling, or information in the communication method according to the sixth aspect and any one of the possible implementation manners of the foregoing sixth aspect, for example, receiving a handover request message and sending a handover command.

Optionally, the communication device may be the target master station, or may be a part of the device in the target master station, for example, a system-on-chip in the target master station. The system-on-chip is adapted to support the target master station to implement the functions referred to in the sixth aspect and any one of its possible implementations, e.g. to receive, transmit or process data and/or information referred to in the above communication method. The chip system includes a chip and may also include other discrete devices or circuit structures.

In a ninth aspect, there is also provided a computer-readable storage medium having instructions stored therein; which when run on a communication device causes the communication device to perform the communication method as described in the above sixth aspect and its various possible implementations.

In a tenth aspect, there is also provided a computer program product comprising instructions which, when run on a communication apparatus, cause the communication apparatus to perform the communication method as described in the above sixth aspect and its various possible implementations.

For a detailed description of the seventh aspect, the eighth aspect, the ninth aspect, the tenth aspect, and various implementations thereof in the present application, reference may be made to the detailed description of the sixth aspect and various implementations thereof; moreover, for the beneficial effects of the seventh aspect, the eighth aspect, the ninth aspect, the tenth aspect and various implementation manners thereof, reference may be made to beneficial effect analysis in the sixth aspect and various implementation manners thereof, and details are not repeated here.

In an eleventh aspect, a communication method is provided, which is applied to a communication system including a first subsystem (the subsystem includes a source primary station and a source secondary station for providing services for terminals) and a second subsystem (the subsystem includes a target primary station capable of providing services for terminals, and a network standard of the target primary station is the same as that of the source secondary station). Specifically, the terminal receives a switching command from the source master station, where the switching command is used to instruct to configure the MCG of the target master station according to the configuration information of the SCG of the source secondary station; and responding to the switching command, and the terminal configures the MCG of the target main station according to the configuration information of the SCG of the source auxiliary station.

After the terminal acquires the switching command, the MCG of the target main station can be configured according to the configuration information of the SCG of the source auxiliary station. Compared with the prior art that the target master station needs to be reconfigured, the method and the device for configuring the target master station effectively reduce time consumption and improve configuration rate and communication rate.

Optionally, in another possible implementation manner of the present application, the handover request message further includes a network type of the source master station, and the second subsystem further includes the target auxiliary station, where the network type of the target auxiliary station is the same as the network type of the source master station. In this scenario, the handover command is also used to instruct the target secondary station to configure the SCG according to the configuration information of the MCG of the source primary station.

Optionally, in another possible implementation manner of the present application, the handover command further includes a release indication or capability information, where the release indication is used to indicate that the configured SRB3 is released, and the capability information is used to indicate that the target secondary station does not support the SRB 3. Accordingly, the terminal also releases the configured SRB 3.

In a 5G dual connectivity communication system, the secondary station may be configured with an SRB 3. If the target secondary station does not support the SRB3, the terminal releases the already configured SRB 3.

Optionally, in another possible implementation manner of the present application, the method for the terminal to receive the handover command from the source master station includes: the terminal receives a switching command sent by a source master station; alternatively, the terminal receives a handover command sent by the source secondary station through the SRB3, where the handover command sent by the source secondary station is from the source primary station.

If the terminal is configured with the split SRB, the terminal can directly communicate with the source master station; if the terminal is not configured with split SRBs and is configured with SRBs 3, the terminal may communicate with the source primary station through the source secondary station.

Optionally, in another possible implementation manner of the present application, before receiving a handover command from a source master station, the terminal further sends a target report to the source master station through the split SRB; alternatively, the terminal also sends a target report to the source secondary station via SRB 3. The target report is used for determining the target primary station, the target report comprises a measurement report or comprises MCG failure information and a measurement report, the MCG failure information is used for indicating MCG failure of the source primary station, and the measurement report is measured based on measurement configuration information sent by the source primary station or the source secondary station.

Optionally, in another possible implementation manner of the present application, the terminal further obtains target configuration information through the SRB3, and configures according to the target configuration information, so as to establish the split SRB.

The terminal establishes the split SRB through the SRB3, so that the terminal can communicate with the source master station according to the established split SRB without passing through the source slave station and the source master station.

Optionally, in another possible implementation manner of the present application, the method for the terminal to obtain the target configuration information through the SRB3 includes: the terminal sends a setup instruction to the source secondary station through the SRB3, and the setup instruction is used for triggering the setup of the split SRB; accordingly, the terminal receives target configuration information from the secondary station through the SRB 3.

A twelfth aspect provides a communication device capable of implementing the functions of the eleventh aspect and any one of its possible implementations. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible implementation manner of the present application, the communication device may include a receiving unit and a processing unit, and the receiving unit and the processing unit may execute corresponding functions in the communication method of the eleventh aspect and any one of the possible implementation manners thereof. For example: a receiving unit, configured to receive a handover command from a source master station, where the handover command is used to instruct to configure an MCG of a target master station according to configuration information of an SCG of a source secondary station; and the processing unit is used for responding to the switching command and configuring the MCG of the target main station according to the configuration information of the SCG of the source auxiliary station.

In a thirteenth aspect, a communication device is provided, which includes a processor, which is coupled to a memory, and reads and executes instructions in the memory to implement the communication method of the eleventh aspect and any one of the possible implementation manners thereof.

Optionally, the communication device may further include a memory for storing program instructions and data for the communication device. Further optionally, the communication device may further include a transceiver, configured to perform, under control of the processor of the communication device, the step of transceiving data, signaling or information in the communication method according to the eleventh aspect and any one of the possible implementations thereof, for example, receiving a handover command.

Alternatively, the communication device may be a terminal, or may be a part of a device in the terminal, such as a system-on-chip in the terminal. The system-on-chip is adapted to support the terminal to implement the functions referred to in the eleventh aspect and any one of its possible implementations, e.g. to receive, transmit or process data and/or information referred to in the above-mentioned communication method. The chip system includes a chip and may also include other discrete devices or circuit structures.

In a fourteenth aspect, a computer-readable storage medium having instructions stored therein is also provided; which when run on a communication device causes the communication device to perform a communication method as described above in the eleventh aspect and its various possible implementations.

In a fifteenth aspect, there is also provided a computer program product comprising instructions which, when run on a communication apparatus, cause the communication apparatus to perform the communication method as described in the above eleventh aspect and its various possible implementations.

Reference may be made to the detailed description of the twelfth aspect, the thirteenth aspect, the fourteenth aspect, the fifteenth aspect and various implementations thereof in this application for reference to the detailed description of the eleventh aspect and various implementations thereof; moreover, for the beneficial effects of the twelfth aspect, the thirteenth aspect, the fourteenth aspect, the fifteenth aspect and various implementation manners thereof, reference may be made to analysis of the beneficial effects of the eleventh aspect and various implementation manners thereof, and details are not described here.

A sixteenth aspect provides a communication system comprising a communication device according to any of the second to fifth aspects, a communication device according to any of the seventh to tenth aspects, and a communication device according to any of the twelfth to fifteenth aspects.

In the present application, the names of the above-mentioned communication means do not limit the devices or functional modules themselves, which may appear by other names in actual implementations. Insofar as the functions of the respective devices or functional modules are similar to those of the present application, they fall within the scope of the claims of the present application and their equivalents.

These and other aspects of the present application will be more readily apparent from the following description.

Drawings

FIG. 1 is a schematic diagram of a communication system architecture for an ENDC scenario;

FIG. 2 is a schematic diagram of a communication system architecture for a NEDC scenario;

FIG. 3 is a schematic diagram of a communication system architecture for an NG-ENDC scenario;

fig. 4 is a schematic diagram of a control plane protocol stack of a terminal in a dual connectivity communication system;

fig. 5 is a schematic hardware configuration diagram of a communication device in an embodiment of the present application;

fig. 6 is a first flowchart illustrating a communication method according to an embodiment of the present application;

fig. 7 is a first schematic processing flow diagram of a control plane in a handover process of a terminal according to an embodiment of the present application;

fig. 8 is a schematic processing flow diagram of a control plane in a handover process of a terminal according to an embodiment of the present application;

fig. 9 is a second flowchart illustrating a communication method according to an embodiment of the present application;

fig. 10 is a third flowchart of a communication method according to an embodiment of the present application;

fig. 11 is a fourth flowchart of a communication method according to an embodiment of the present application;

fig. 12 is a first schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 13 is a second schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 14 is a third schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.

In the fifth generation communication technology (5G) system, there is a multiple radio access technology (MR-DC) communication system. The MR-DC communication system includes ENDC (E-UTRA NR DC), NEDC (NR E-UTRA DC), and NG-ENDC (NextGeneration E-UTRA NR DC).

In the three communication systems, a Long Term Evolution (LTE) base station (e.g., an evolved node base (eNB) connected to an Evolved Packet Core (EPC) or an ng-eNB connected to a next-generation core Network (NGC)) is in dual connection with a New Radio (NR) base station (referred to as a gNB).

Wherein, the ng-eNB may provide the service of the 5th generation core network (5 GCN) for the terminal, and may also provide the service of the EPC for the terminal. In an actual deployment, the ng-eNB may be connected with only 5GCN/EPC, or may be connected with both 5GCN and EPC. 5GCN may also be referred to as 5 GC.

The ENDC is also referred to as Option 3/3A/3X. In the ENDC communication system, an LTE eNB is a master station (MN), a gNB is a secondary Station (SN), the MN is connected with an EPC, and the MN and the SN both provide air interface transmission resources for data between UE and the EPC.

As shown in fig. 1, (a) in fig. 1 is a schematic structural diagram of the Option3 communication system, and (b) in fig. 1 is a schematic structural diagram of the Option3A communication system. In the Option3 communication system, the LTE eNB is connected with the EPC through an S1 interface (comprising an S1-C interface and an S1-U interface), and the LTE eNB is connected with the gNB through an X2 interface. Unlike the Option3 communication system, in the Option3A communication system, the gNB is also connected to the EPC through the S1-U interface. For ease of distinction, the connections of the control planes are indicated by dashed lines in fig. 1.

NEDC is also known as Option 4/4 a. In the NEDC communication system, the gbb is MN, the ng-eNB is SN, the MN is connected to the 5GC, and the MN and the SN provide an air interface transmission resource for data between the terminal and the 5 GC.

As shown in fig. 2, (a) in fig. 2 is a schematic structural diagram of the Option4 communication system, and (b) in fig. 2 is a schematic structural diagram of the Option4A communication system. In the Option4 communication system, the gNB is connected with the 5GC through an NG interface (comprising an NG-C interface and an NG-U interface), and the NG-eNB is connected with the gNB through an Xn interface. Unlike the Option4 communication system, in the Option4A communication system, the NG-eNB is also connected to the 5GC through the NG-U interface. For ease of distinction, the connections of the control plane are indicated by dashed lines in fig. 2.

NG-ENDC is also known as Option 7/7A/7X. In the NG-ENDC communication system, the NG-eNB is MN, the gNB is SN, and the MN is connected with 5 GC. Different from the ENDC communication system, in the NG-ENDC communication system, the MN and the SN provide air interface transmission resources for data between the terminal and the 5 GC.

As shown in fig. 3, (a) in fig. 3 is a schematic structural diagram of the Option7 communication system, and (b) in fig. 3 is a schematic structural diagram of the Option7A communication system. In the Option7 communication system, the NG-eNB is connected with the 5GC through an NG interface (comprising an NG-C interface and an NG-U interface), and the NG-eNB is connected with the gNB through an Xn interface. Unlike the Option7 communication system, in the Option7A communication system, the gNB is also connected to the 5GC through the NG-U interface. For ease of distinction, the connections of the control plane are indicated by dashed lines in fig. 3.

In practical applications, there is also a dual connectivity communication system supporting NR and NR, in which both MN and SN are gNB. Of course, there is also a dual connectivity communication system supporting LTE and LTE, in which both MN and SN are LTE enbs.

In a dual connectivity communication system, a base station where a Packet Data Convergence Protocol (PDCP) entity of a certain Radio Bearer (RB) is located is called a PDCP anchor (anchor), a transmission path between a Master Node (MN) and a terminal is called an MN link, an MN leg (MN leg) or a master leg (master leg), and a transmission path between a secondary Station (SN) and the terminal is called an SN link, an SN leg (SNleg) or a secondary leg (slave).

Generally, a protocol stack of a terminal includes a Radio Resource Control (RRC) layer, a PDCP layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. In a dual connectivity communication system, a terminal may transmit over two air interfaces, and thus, the terminal has two MAC entities. When the terminal transmits data through an air interface between the terminal and the main station, using an MAC entity corresponding to the main station; when the terminal transmits data through an air interface between the terminal and the secondary station, the MAC entity corresponding to the secondary station is used. Each MAC entity may communicate with multiple RLC entities.

The master station may provide air interface transmission resources for the terminal through a plurality of cells, where the plurality of cells form a Master Cell Group (MCG). Correspondingly, the secondary station may also provide air interface transmission resources for the terminal through multiple cells, where the multiple cells form a Secondary Cell Group (SCG).

In a dual connectivity communication system, there are two types of radio bearers for the UE. Wherein, the first type is bearer (MN terminated bearer) terminated by PDCP, referred to as MN bearer for short, the PDCP at the side of the bearer base station is deployed on MN, and the PDCP of MN carries out security related processing; the second type is a PDCP terminated bearer (SN terminated bearer), referred to as SN bearer, where the PDCP at the base station side of this bearer is deployed on the SN, and the SN PDCP performs security related processing. The PDCP Protocol Data Unit (PDU) carried by the MN and the SN may be sent through MN air interface resources and/or SN air interface resources. When the transmission is only carried out through an MN air interface resource, the transmission is called MCG bearing; when the transmission is only through SN air interface resources, the SCG bearer is called; when MN air interface resources and SN air interface resources are used simultaneously for transmission, the split (split) bearer is called, and at this time, if MN bearer is used, MCG split bearer is used, and if SN bearer is used, SCG split bearer is used. For split (split) bearers, the MCG and SCG transport the same PDCP PDUs. The base station may configure split SRB 1 and split SRB 2 for the UE, i.e., SRB 1 and SRB 2 are configured as split bearers. At this time, the RRC message that the UE sends SRB 1/SRB 2 may be transmitted through MCG or SCG.

In addition, the SN may also be configured with the SRB3 of the UE so that the UE can directly interact RRC messages with the SN through the SRB 3. Specifically, the RRC message of SRB3 may only be transmitted through SCG.

For a split SRB (e.g., split SRB 1 or split SRB 2), both the primary and secondary stations configure the terminal with an RLC bearer (bearer). The RLC carries a Logical Channel (LC) including an RLC entity and a MAC layer associated with the SRB or the DRB. The terminal has an RRC entity (entity) corresponding to the MN, and an RRC message generated by the RRC entity may be transmitted through an RLC bearer corresponding to the MN or an RLC bearer corresponding to the SN after being processed by a PDCP entity corresponding to the split SRB. That is, for a split SRB, both data from the primary station and data from the secondary station can be processed using a unified PDCP entity, and the PDCP entity corresponds to the split SRB.

For SRB3, the terminal has an RRC entity corresponding to the SN, and the RRC message generated by the RRC entity is transmitted through the RLC bearer corresponding to the SN after being processed by the PDPC entity corresponding to SRB 3.

For example, for the communication system shown in fig. 1 or fig. 3, the primary station is an LTE base station, the secondary station is a gNB, and fig. 4 shows a control plane protocol stack of a terminal in the communication system. As shown in fig. 4, the terminal includes an evolved UMTS terrestrial radio access (E-UTRA) MAC entity and an NR MAC entity, data processed by the E-UTRA MAC entity may be transmitted to the E-UTRA RLC entity, data processed by the NR MAC entity may be transmitted to the NR RLC entity, and data processed by the E-UTRA RLC entity and the NR RLC entity may be transmitted to the NRPDCP entity corresponding to the split SRB, where communication between the NR RLC entity and the NR PDCP entity corresponding to the split SRB is represented by dotted lines in fig. 4. Subsequently, the data processed by the NR PDCP entity corresponding to the split SRB is transmitted to the RRC entity configured for the split SRB. For SRB3, the data processed by the NR RLC entity may be transferred to the NR PDCP entity corresponding to SRB3, and subsequently, the data processed by the NR PDCP entity corresponding to SRB3 may be transferred to the RRC entity configured for SRB 3.

In the dual connectivity communication system, when the UE transmits data through the MCG and the SCG, the MCG or the SCG may fail/malfunction, such as reconfiguration failure, handover failure, integrity check failure, and the like.

If the SCG fails, the UE suspends (suspend) SCG transmission and sends an SCG failure report (SCG failure report) to the MN to notify the MN that the UE has an abnormal condition in the SCG, and subsequently, the MN performs subsequent processing in any one of the following manners: 1. MN sends SCG failure report to SN to request SN to reconfigure UE; 2. MN determines to replace SN for UE and triggers the process of replacing SN; 3. the MN releases the SN.

If the MCG fails, the UE releases the configuration of the source SCG and performs cell selection, except for the configuration of the Data Radio Bearer (DRB), and a base station (referred to as a reselection base station for short) to which the cell selected by the UE belongs reconfigures the UE, so as to complete communication between the UE and the reselection base station. Subsequently, the SN may also be reconfigured for the UE.

However, in the above method, the process time of the terminal configuring and reselecting the base station is longer, and the configuration rate is lower, which reduces the communication rate.

In addition, in the dual connectivity communication system, if the current communication quality is poor, the source MN may determine to handover the terminal to the target base station. And the target base station reconfigures the terminal and deletes the configuration information of the source SCG. Accordingly, the terminal releases the communication with the source MN and the source SN.

However, in the above method, the process time of the terminal configuring the target base station is longer, and the configuration rate is lower, which reduces the communication rate.

In view of the foregoing problems, embodiments of the present application provide a communication method, apparatus, and system, where for a communication system including a first subsystem (where the subsystem includes a source master station and a source slave station providing services for a terminal) and a second subsystem (where the subsystem includes a target master station capable of providing services for the terminal, and optionally further includes a target slave station capable of providing services for the terminal), if a network format of the target master station is the same as a format of the source slave station, when the terminal needs to be switched to the target master station, the MCG of the target master station is configured according to configuration information of the SCG of the source slave station by reserving configuration information of the SCG of the source slave station, so as to implement switching of the terminal, and further enable the terminal to communicate with the target master station. In the embodiment of the present application, the configuration of the MCG of the target master station is performed according to the configuration information of the SCG of the source secondary station, and compared with the prior art in which the target master station needs to be reconfigured, the embodiment of the present application effectively reduces time consumption and improves configuration rate and communication rate.

The communication method provided by the embodiment of the application is applicable to a communication system including a first subsystem and a second subsystem, where the first subsystem and the second subsystem may both be the MR-DC communication system shown in fig. 1 to 3, may also be a dual connection system of a gNB and a gNB, and may also be a dual connection communication system of an lte eNB and an lte eNB, and are not listed here. Furthermore, the second subsystem may also be a single connection communication system.

The source master station is a master station which provides services for the terminal in the first subsystem, and the source auxiliary station is an auxiliary station which provides services for the terminal in the first subsystem.

And if the second subsystem is a dual-connection communication system, the second subsystem comprises a target master station and a target auxiliary station, the target master station is a master station which provides service for the terminal in the second subsystem, and the target auxiliary station is an auxiliary station which provides service for the terminal in the second subsystem. And if the second subsystem is a single-connection communication system, the second subsystem comprises a target master station, and the target master station provides service for the terminal.

For example, if the first subsystem is as shown in fig. 2 and the second subsystem is as shown in fig. 3, the source primary station is a gNB, the source secondary station is a ng-eNB, and correspondingly, the target primary station is the ng-eNB and the target secondary station is the gNB. If the first subsystem is as shown in fig. 3, the source primary station is ng-eNB and the source secondary station is gNB.

Optionally, the communication method provided in this embodiment of the present application may be applied to a scenario in which a source master station or a source auxiliary station determines to switch a terminal to a target master station according to a measurement report sent by the terminal after an MCG fails, and may also be applied to a scenario in which the source master station or the source auxiliary station determines to switch the terminal to the target master station directly according to the measurement report sent by the terminal without the MCG failing.

The primary station according to the embodiment of the present application may be the above-mentioned gNB or the above-mentioned ng-eNB, which is not limited in the embodiment of the present application. Similarly, the secondary station according to the embodiment of the present application may be the above-mentioned gNB, or may also be the above-mentioned ng-eNB, which is not limited in the embodiment of the present application.

In the embodiment of the present application, the network standard of the target master station is the same as the network standard of the source auxiliary station, and if the second subsystem is a dual connectivity communication system, the network standard of the target auxiliary station may be the same as the network standard of the source master station, and may also be the same as the network standard of the source auxiliary station.

For example, if the first subsystem is as shown in fig. 2 and the second subsystem is as shown in fig. 3, the network type of the target primary station is the same as that of the source secondary station, and the network type of the target secondary station is the same as that of the source primary station.

Each of the devices in fig. 1 to 3 described above belongs to a communication apparatus. In a specific implementation, the communication device has the components shown in fig. 5. Fig. 5 is a schematic diagram of a communication device according to an embodiment of the present disclosure, and as shown in fig. 5, the communication device may include a processor 51, a memory 52, a transceiver 53, and a bus 54. The following specifically describes each constituent element of the communication apparatus with reference to fig. 5:

the processor 51 is a control center of the communication apparatus, and may be a single processor or a collective term for a plurality of processing elements. For example, the processor 51 is a Central Processing Unit (CPU), and may be an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as: one or more Digital Signal Processors (DSPs), or one or more field-programmable gate arrays (FPGAs).

The processor 51 may perform various functions of the communication device by running or executing software programs stored in the memory 52, and calling data stored in the memory 52, among other things.

For one embodiment, processor 51 may include one or more CPUs, such as CPU 0 and CPU1 shown in FIG. 5.

The communication device may also include other processors, such as the processor 55 shown in fig. 5, for example, as an example. Each of the plurality of processors in the communication apparatus may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The memory 52 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 52 may be separate and coupled to the processor 51 by a bus 54. The memory 52 may also be integrated with the processor 51.

The memory 52 is used for storing software programs for executing the scheme of the application, and is controlled by the processor 51 to execute.

The transceiver 53 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), etc. The transceiver 53 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.

The bus 54 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.

It is noted that the device structure shown in fig. 5 does not constitute a limitation of the communication apparatus, which may comprise more or less components than those shown in fig. 5, or a combination of some components, or a different arrangement of components, in addition to those shown in fig. 5.

The following describes a communication method provided in an embodiment of the present application with reference to the communication systems shown in fig. 1 to 3 and the communication apparatus shown in fig. 5. Each device mentioned in the following method embodiments may have a component shown in fig. 5, and is not described again.

Fig. 6 is a flowchart illustrating a communication method according to an embodiment of the present application. Referring to fig. 6, the communication method includes the following steps.

S600, the source master station sends a switching request message to the target master station.

And after determining to switch the terminal to the target master station, the source master station sends a switching request message to the target master station for requesting to switch the terminal to the target master station.

Optionally, if there is a direct interface between the source master station and the target master station, for example, an X2 interface or an Xn interface, the source master station sends the handover request message to the target master station through the direct interface.

If no direct interface exists between the source master station and the target master station, the source master station sends a switching request message to core network equipment connected with the source master station, and further, the core network equipment sends the switching request message to the target master station. The core network devices connected with the source master station and the target master station may be the same or different.

For example, if the source master station is connected to the 4G core network device through the S1 interface, the target master station is connected to the 5G core network device through the NG interface, the source master station sends a handover request message to the 4G core network device through the S1 interface, and indicates identification information of the target master station (e.g., TAC, global identification of the target master station, etc.); then, the 4G core network equipment sends the switching request message to the 5G core network equipment; thus, the 5G core network device can send the handover request message to the target master station through the NG interface.

Of course, for a scenario in which the source master station is connected to the 5G core network device through the NG interface and the target master station is connected to the 4G core network device through the S1 interface, or for a scenario in which both the source master station and the target master station are connected to the core network device through the NG/S1 interface, the process of the source master station sending the handover request message may refer to the previous example.

The switching request message comprises network system information of the source auxiliary station.

Optionally, the handover request message further includes a context of the terminal. The context of the terminal may further include related configuration of the DC, for example, the context of the terminal includes information implicitly indicating a network type of the source secondary station.

For example, if the first subsystem is as shown in fig. 2, the network format of the source secondary station is evolved UMTS terrestrial radio access (E-UTRA). If the first subsystem is as shown in fig. 3, the network standard of the source secondary station is NR.

Optionally, the source master station may determine to switch the terminal to the target master station after obtaining the measurement report sent by the terminal, or the source master station determines to switch the terminal to the target master station and communicate with the target master station after receiving information of the target master station sent by the source slave station (for example, the source slave station determines the target master station according to the MCG failure information and the measurement report sent by the terminal under the condition of MCG failure), or the source master station determines to switch the terminal to the target master station after obtaining the measurement report and the MCG failure information sent by the terminal.

Wherein the MCG failure information is used for indicating MCG failure. The measurement report is a report obtained by measurement based on measurement configuration information sent by the source primary station or the source secondary station. For example, the measurement report is obtained by measuring a cell located at a frequency of the source primary station.

The information of the target master station comprises the identification of the target master station or comprises the identification of the target master station and the identification of the target cell. Here, the target cell is a main serving cell after the terminal is handed over to the target master station.

Further optionally, the MCG failure information is used to indicate an MCG failure type. Specifically, the MCG failure type may be any one of the following cases: the MCG bears the RLC exceeding the maximum retransmission times, the MCG has radio link failure, switching failure, the SRB of the main station side has integrity check failure, the PDCP adopting the key of the main station has integrity check failure, and the main station side has reconfiguration failure. The switching can be intra-system switching, cross-system switching or cross-system switching. The integrity check failure may be an integrity check failure of the SRB or an integrity check failure of the DRB.

In this embodiment of the present application, a method for a source master station to obtain a target report (a measurement report, or the measurement report and MCG failure information) may be: if the source primary station is not configured with the split SRB and the source secondary station is configured with the SRB3, the terminal may send a target report to the source secondary station through the SRB3, and subsequently, the source secondary station forwards the target report to the source primary station. And if the source main station is configured with the split SRB, the source main station receives the target report from the terminal through the split SRB.

The split SRB may be pre-established, or may be established for the terminal via the SRB3 (this process may refer to the description of fig. 10 later).

S601, if the target master station reserves resources for the terminal, the target master station sends a switching command to the source master station.

And the target master station performs admission control after receiving the switching request message sent by the source master station. And if the target master station can reserve resources for the terminal, the target master station sends a switching command to the source master station.

Specifically, after receiving the handover request message, the target master station acquires the network system information of the source slave station in the handover request message. Subsequently, the target master station judges whether the network standard of the target master station is the same as that of the source auxiliary station. And if the network system of the target main station is the same as that of the source auxiliary station, the switching command sent by the target main station to the source main station is used for indicating the MCG of the target main station to be configured according to the configuration information of the SCG of the source auxiliary station.

For example, as shown in fig. 7, the first subsystem is an NG-endec system, the second subsystem is an NR system, the source master station is an NG-eNB, the source secondary station is a gNB, the target master station is a gNB, and a network standard of the target master station is the same as that of the source secondary station, and then a handover command sent by the target master station to the source master station is used to instruct to configure the MCG of the target master station according to the configuration information of the SCG of the source secondary station.

The switching command can be embodied by the following implementation mode:

in an alternative implementation manner, the handover command includes first indication information, where the first indication information is used to indicate that the configuration information of the SCG of the source secondary station is used as the configuration information of the MCG of the target primary station. It can be understood that the first indication information is used for indicating to upgrade the configuration information of the SCG of the source secondary station to the configuration information of the MCG of the target primary station.

Optionally, the first indication information may be embodied directly (or referred to as explicit) or indirectly (or referred to as implicit), which is not limited in this embodiment of the application.

In another optional implementation manner, the handover command includes first configuration increment information, and the first configuration increment information is used to configure the MCG of the target primary station in combination with the configuration information of the SCG of the source secondary station.

In another optional implementation manner, the handover command includes first full configuration indication information, where the first full configuration indication information is used to indicate that the MCG of the target master station is reconfigured. And if the switching command does not comprise the first full configuration indication information, the switching command is used for indicating that the MCG of the target main station is configured according to the configuration information of the SCG of the source auxiliary station.

Further, if the second subsystem further includes a target secondary station, the target primary station may acquire the network type of the target secondary station. The target master station can acquire the network type of the source master station by receiving the switching request message. After the network system of the source main station is obtained, the target main station also judges whether the network system of the target auxiliary station is the same as that of the source main station. And if the network system of the target auxiliary station is the same as that of the source main station, the switching command sent by the target main station to the source main station is also used for indicating to configure the SCG of the target auxiliary station according to the configuration information of the MCG of the source main station.

Illustratively, as shown in fig. 8, the first subsystem is an NG-eNB system, the second subsystem is an NE-DC system, the source primary station is an NG-eNB, the source secondary station is a gNB, the target primary station is a gNB, and the target secondary station is an NG-eNB. And if the network system of the target main station is the same as that of the source auxiliary station, and the network system of the target auxiliary station is the same as that of the source main station, the switching command sent by the target main station to the source main station is used for indicating the MCG of the target main station to be configured according to the configuration information of the SCG of the source auxiliary station, and also can be used for indicating the SCG of the target auxiliary station to be configured according to the configuration information of the MCG of the source main station.

Correspondingly, the switching command can also be embodied by adopting the following implementation mode:

in an optional implementation manner, the handover command further includes second indication information, where the second indication information is used to indicate that the configuration information of the MCG of the source primary station is used as the configuration information of the SCG of the target secondary station. It is understood that the second indication information is used to indicate that the configuration information of the MCG of the source primary station is upgraded to the configuration information of the SCG of the target secondary station.

Optionally, the second indication information may be embodied directly (or referred to as explicit) or indirectly (or referred to as implicit), which is not limited in this embodiment of the application.

In another optional implementation manner, the handover command further includes second configuration increment information, where the second configuration increment information is used to configure the SCG of the target secondary station in combination with the configuration information of the MCG of the source primary station.

In another optional implementation manner, the handover command includes second full configuration indication information, where the second full configuration indication information is used to indicate that the SCG of the target secondary station is reconfigured. And if the switching command does not comprise the second full configuration indication information, the switching command is used for indicating that the SCG of the target secondary station is configured according to the configuration information of the MCG of the source main station.

Further optionally, if the source secondary station has configured SRB3 and the target secondary station does not support SRB3, the handover command sent by the target primary station further includes a release indication or capability information, where the release indication is used to indicate that the configured SRB3 is released and the capability information is used to indicate that the target secondary station does not support SRB3, so that the terminal may release the configured SRB3 according to the release indication or the capability information after receiving the handover command.

Wherein, the capability information may be an implicit indication. Taking the second subsystem as an NE-DC system as an example, since the secondary station ng-NB of the NE-DC system does not support the SRB3, after the terminal acquires the information of the target secondary station, it may be determined that the target secondary station does not support the SRB 3.

S602, the source master station sends a switching command to the terminal.

In one possible implementation, the source master station sends a handover command to the terminal through the MCG.

In another possible implementation manner, the source primary station determines that the MCG of the terminal fails, and sends a handover command to the terminal through the source secondary station.

In one example, if the terminal configures the split SRB, the source master station sends a handover command to the terminal through the split SRB.

In another example, if the source secondary station informs the source primary station that the source secondary station has been configured with SRB3, the source primary station may send a handover command to the source secondary station, and subsequently, the source secondary station sends the handover command to the terminal through the SRB 3.

S603, responding to the switching command, and configuring the MCG of the target main station by the terminal according to the configuration information of the SCG of the source auxiliary station so as to realize communication with the target main station.

If the second subsystem further includes the target secondary station, the terminal in this embodiment further configures the SCG of the target secondary station according to the configuration information of the MCG of the source master station, so as to implement communication with the target secondary station. As shown in fig. 6, after S602, S604 may also be performed.

S604 (optionally), the terminal configures the SCG of the target secondary station according to the configuration information of the MCG of the source primary station, so as to implement communication with the target secondary station.

Since S604 is optional, it is indicated by a dashed box in fig. 6.

As can be seen from the above description, if the source secondary station has configured the SRB3 and the target secondary station does not support the SRB3, the handover command sent by the target primary station may further include a release indication or capability information, so that the terminal may release the configured SRB3 according to the release indication or capability information after receiving the handover command.

As shown in fig. 6, after S602, S605 may also be performed.

S605 (optional), the terminal releases the configured SRB 3.

Since S605 is optional, it is indicated by a dashed box in fig. 6.

In one example, as shown in fig. 7, after receiving the handover command, the terminal releases the configuration information of the source primary station, and configures the MCG of the target primary station according to the configuration information of the SCG of the source secondary station. The source secondary station in fig. 7 has been configured with an SRB3, and since there is no target secondary station, the terminal also releases the configured SRB 3.

In addition, the terminal in fig. 7 may further retain configuration information of the SDAP entity and configuration information of the NRPDCP entity corresponding to the source master station, and then configure the NR PDCP entity and the SDAP entity in the target master station according to the configuration information.

In another example, as shown in fig. 8, after receiving the handover command, the terminal configures the MCG of the target primary station according to the configuration information of the SCG of the source secondary station, and configures the SCG of the target secondary station according to the configuration information of the MCG of the source primary station. The source secondary station in fig. 8 has been configured with SRB3, and since the target secondary station in fig. 8 does not support SRB3, the terminal also releases the configured SRB 3.

In addition, the terminal in fig. 8 may further retain configuration information of the SDAP entity and configuration information of the NRPDCP entity corresponding to the source master station, and then configure the NR PDCP entity and the SDAP entity in the target master station according to the configuration information.

In summary, the configuration of the MCG of the target master station by the terminal in the embodiment of the present application is performed according to the configuration information of the SCG of the source secondary station, and compared with the prior art that the target master station needs to be reconfigured, the embodiment of the present application effectively reduces time consumption and improves configuration rate and communication rate.

As can be seen from the above description, the source master station may determine to switch the terminal to the target master station after acquiring the measurement report sent by the terminal, or the source master station determines to switch the terminal to the target master station and communicate with the target master station after receiving information of the target master station sent by the source auxiliary station, or the source master station determines to switch the terminal to the target master station after acquiring the measurement report and the MCG failure information sent by the terminal.

In conjunction with fig. 6, as shown in fig. 9, before S600, S901 or S902 may be further included.

S901, the source main station acquires the target report and determines to switch the terminal to the target main station according to the target report.

The target report includes MCG failure information. Further, the target report may include a measurement report.

The method for the source primary station to obtain the target report may refer to the description of S600, and is not described herein again.

S902, the source auxiliary station sends the information of the target main station to the source main station.

Specifically, the source secondary station receives a target report sent by the terminal, determines to switch the terminal to the target primary station according to the target report, and subsequently, the source secondary station sends information of the target primary station to the source primary station.

Further optionally, the source secondary station further sends MCG failure information to the target primary station.

Since both S901 and S902 are used for the source master to obtain the information of the target master, the source master selects one of them to perform, and fig. 9 shows S902 by a dotted line.

In the flow shown in fig. 6/9, the network standard of the target master station is the same as that of the source auxiliary station, the network standard of the target auxiliary station is the same as that of the source master station, the target master station and the source auxiliary station are different devices, and the target auxiliary station and the source master station are different devices.

In practical application, the network system of the target master station and the network system of the target auxiliary station can be the same as the network system of the source auxiliary station. In addition, the target master station and the source secondary station may be the same device, and the target secondary station and the source master station may also be the same device.

If the target master station and the source auxiliary station are different devices and have the same network systems, in a scenario where the network system of the target master station and the network system of the target auxiliary station are both the same as the network system of the source auxiliary station, the switching command sent by the target master station to the source master station may be used to instruct the MCG of the target master station to be configured according to the configuration information of the SCG of the source auxiliary station, and may also be used to instruct the MCG of the target master station and the SCG of the target auxiliary station to be configured according to the configuration information of the SCG of the source auxiliary station.

If the handover command is used to instruct the MCG of the target master station to be configured according to the configuration information of the SCG of the source secondary station, the terminal configures the MCG of the target master station according to the configuration information of the SCG of the source secondary station, which may refer to the description in fig. 6/9. And subsequently, after the configuration of the target main station is completed, reconfiguring the target auxiliary station.

If the switching command is used to instruct the MCG of the target primary station and the SCG of the target secondary station to be configured according to the configuration information of the SCG of the source secondary station, the terminal may configure the MCG of the target primary station according to the corresponding configuration increment information based on the configuration information of the SCG of the source secondary station, and configure the SCG of the target secondary station by using the configuration information of the SCG of the source secondary station as the configuration information of the SCG of the target secondary station.

If the target main station and the source auxiliary station are the same device, the source auxiliary station receives the switching request message sent by the source main station, correspondingly, the source auxiliary station generates a switching command, sends the switching command to the terminal and indicates that the source auxiliary station is used as the switched target main station. Optionally, the source secondary station may send the handover command to the terminal through SRB3, or the source secondary station sends the handover command to the source primary station, and then the source primary station sends the handover command to the terminal through the split SRB, or sends the handover command to the terminal through the SCG bearer of the split SRB. Optionally, the handover command may be used to instruct to configure the MCG of the target primary station according to the configuration information of the SCG of the source secondary station, which is specifically described in the foregoing S603. Further optionally, the handover command may further instruct to configure the SCG of the target secondary station according to the configuration information of the MCG of the source primary station. Correspondingly, the terminal completes corresponding configuration according to the switching command, upgrades the source auxiliary station to the main station and communicates with the main station.

The following describes a scenario in which the target primary station and the source secondary station are the same device. For the convenience of understanding, the terminal is switched from the source primary station to the source secondary station for example when the MCG fails. As shown in fig. 10, a communication method provided in an embodiment of the present application includes:

s1000, the terminal monitors the MCG, and after the MCG fails, the MCG failure information is sent to the source main station/the source auxiliary station.

The MCG failure refers to at least one of a reconfiguration failure, a handover failure, an integrity check failure, a radio link failure, exceeding an RLC maximum number of retransmissions, or a random access failure.

The switching can be intra-system switching, cross-system switching or cross-system switching. The integrity check failure may be an integrity check failure of an SRB or an integrity check failure of a DRB, where the SRB or the DRB may correspond to the source master station.

Optionally, if the terminal determines that the MCG fails, the terminal suspends the transmission of the MCG, including the transmission of all SRBs and DRBs, for example, suspends the MCG bearers of all SRBs and DRBs.

Further optionally, the terminal suspends transmission of the SCG bearer of the DRB.

After determining that the MCG fails, the terminal sends MCG failure information to the source master station/source secondary station, and further, the terminal may also send a measurement report.

If the terminal is configured with the split SRB, the terminal can send MCG failure information and a measurement report to the source main station through the split SRB, so that the source main station can determine whether to switch or not and whether to switch to the source auxiliary station according to the MCG failure information and the measurement report.

If the terminal is configured with the SRB3, the terminal may transmit MCG failure information and a measurement report to the source secondary station through the SRB 3. Subsequently, the source secondary station may determine whether to switch to and whether to switch to its own cell (i.e., switch to the source secondary station) according to the MCG failure information and the measurement report, and may also send the MCG failure information and the measurement report to the source primary station, so that the source primary station determines whether to switch to and whether to switch to the source secondary station according to the MCG failure information and the measurement report.

It is easily understood that, if the source secondary station determines to switch the terminal to the source secondary station according to the MCG failure information and the measurement report, the source secondary station transmits source secondary station information to the source primary station for informing the source primary station to switch the terminal to the source secondary station.

Since the terminal may send MCG failure information and a measurement report to the source primary station and may also send MCG failure information and a measurement report to the source secondary station, either one of them is selected to be executed, in fig. 10, a dotted line indicates that the terminal sends MCG failure information and a measurement report to the source secondary station, a solid line indicates that the terminal sends MCG failure information and a measurement report to the source primary station, and indicates that the terminal selects a mode to send MCG failure information and a measurement report.

S1001, the source main station determines to switch the terminal to the source auxiliary station.

Alternatively, the source primary station determines to switch the terminal to the source secondary station. Optionally, the source master station determines to switch the terminal to the source secondary station according to the obtained MCG failure information and the measurement report; or the source main station acquires the information of the source auxiliary station sent by the source auxiliary station and determines to switch the terminal to the source auxiliary station.

Alternatively, the source secondary station determines to switch the terminal to the source secondary station, and notifies the source primary station.

In this scenario, the source secondary station provides independent (standby) access, i.e., the source secondary station supports the capability of separately serving the terminal.

S1002, the source main station sends a switching request message to the source auxiliary station.

And under the condition that the source main station determines to switch the terminal to the source auxiliary station, the switching request message is used for requesting to switch the terminal to the source auxiliary station.

In the case where the source secondary station determines to handover the terminal to the source secondary station, the handover request carries the context of the terminal.

And S1003, the source auxiliary station sends a switching command to the terminal.

In one implementation, if the source secondary station is configured with SRB3, the source secondary station sends a handover command to the terminal through SRB 3.

In another implementation, if the source primary station is configured with the split SRB, the source secondary station may send a handover command to the terminal through the source primary station.

Optionally, the handover command is used to instruct to upgrade the configuration information of the SCG of the source secondary station to the configuration information of the MCG, that is, to configure the MCG of the target primary station (i.e., the source secondary station) according to the configuration information of the SCG of the source secondary station.

Optionally, the handover command further includes key update information for deriving a key used after handover to the source secondary station.

Illustratively, the handover command is embodied in an RRC reconfiguration message.

And S1004, the terminal upgrades the source auxiliary station to the main station according to the switching command.

Optionally, the terminal upgrades the source secondary station to the primary station according to the configuration information of the SCG of the source secondary station.

Illustratively, the first subsystem is an NG-endec system, the source primary station is an NG-eNB, the source secondary station is a gNB, and the source secondary station is configured with an SRB3, after receiving a handover command, the terminal releases the configured RLC bearers in the SRB3 and the source MCG, establishes an RLC bearer corresponding to the source secondary station, and associates an RRC entity of the terminal with the source secondary station, so as to upgrade the source secondary station to the primary station, and enable communication between the terminal and the source secondary station.

Optionally, if the terminal suspends the transmission of the SCG bearer of the DRB in S1000, after receiving the handover command, the terminal applies the updated key to resume the data transmission with the source secondary station, for example, resume the transmission of the SCG bearer corresponding to the DRB.

And in the process of recovering the SCG bearer transmission by the terminal, the terminal does not perform random access to the source secondary station.

Further optionally, the terminal performs MAC reset corresponding to the source SCG immediately after suspending the SCG bearer or performs MAC reset after receiving the handover command and before resuming transmission of the suspended SCG bearer.

In the embodiment of the application, under the condition of MCG failure, the source main station or the source auxiliary station decides to switch the terminal to the target main station, so that the terminal is prevented from sending a crane building flow, and the time for recovering data transmission by the terminal under the condition of MCG failure is effectively reduced.

Furthermore, the terminal in the embodiment of the present application may further reserve the source configuration information, and configure the target primary station/the target secondary station according to the requirement by combining the reserved source configuration information, thereby effectively reducing time consumption and improving the configuration rate and the communication rate.

As can be seen from the above description, in the embodiment of the present application, the split SRB of the source primary station may be pre-established, or may be established by the terminal through the SRB3 of the source secondary station. A method by which the terminal establishes the split SRB through the SRB3 of the source secondary station will now be described.

The MCG failure, the source primary station not configured with the split SRB, and the source secondary station configured with the SRB3 are exemplified. As shown in fig. 11, a communication method provided in an embodiment of the present application includes:

s1100, the terminal monitors the MCG and judges whether the MCG fails.

Optionally, the MCG failure refers to at least one of a reconfiguration failure, a handover failure, an integrity check failure, a radio link failure, a maximum number of retransmissions exceeding the RLC, or a random access failure.

If the terminal determines that the MCG fails, S1101 and the following steps are continuously performed. Optionally, if the MCG fails, the terminal suspends the transmission of the MCG, including the transmission of all SRBs and DRBs, for example, suspends the MCG bearer of all SRBs and DRBs. Further optionally, the terminal suspends transmission of the SCG bearer of the DRB.

S1101, the terminal judges whether the split SRB is configured.

S1102, if the split SRB is not configured, the terminal acquires target configuration information for configuring the split SRB.

In one implementation, if the split SRB is not configured, the terminal configures the split SRB according to pre-specified configuration information, where the target configuration information is pre-specified. In this case, S1102 is specifically S1102 a.

In another implementation, if the split SRB is not configured, the terminal sends a setup indication to the source secondary station through the SRB3, so as to trigger the secondary station to set up the split SRB (S1102 b); accordingly, the source secondary station acquires the target configuration information (S1102c), and transmits the target configuration information to the terminal through the SRB3 (S1102 d). In addition, the source secondary station also sends indication information used for indicating the terminal to establish the RLC bearer of the SCG corresponding to the split SRB to the terminal, and the indication information can be embodied in a direct (i.e. explicit) or indirect (i.e. implicit) manner.

Since S1102a and S1102b S1102d are parallel schemes, S1102b S1102d are indicated by dashed lines in fig. 11.

If the terminal acquires the target configuration information by performing S1102b to S1102d, the source secondary station may also transmit a setup message to the source primary station for informing the source primary station that the split SRB has been established (S1102'). Since S1102' is an optional step, it is indicated by a dotted line in fig. 11.

S1103, the terminal configures according to the target configuration information to establish the split SRB.

And S1104, the terminal sends MCG failure information to the source secondary station through the split SRB.

The description of the MCG failure information may refer to the description of S600, which is not repeated herein.

S1105, the source auxiliary station transmits MCG failure information to the source main station.

Optionally, the source secondary station may send a setup message to the source primary station while sending MCG failure information to the source primary station, where the setup message is used to indicate that the split SRB is already established.

The terminal establishes the split SRB through the SRB3, so that the subsequent source secondary station does not need to sense and analyze MCG failure information, and the MCG failure information can be sent to the source main station through the established split SRB, thereby effectively reducing the burden of the source secondary station.

The embodiment of the present application provides a communication device 12, where the communication device 12 may be a source master station, and may also be a part of a device in the source master station, for example, a chip system in the source master station. Optionally, the system-on-chip is configured to support the source master station to implement functions involved in the foregoing method embodiments, for example, to receive, transmit, or process data and/or information involved in the foregoing method. The chip system includes a chip and may also include other discrete devices or circuit structures.

The communication means 12 is arranged to perform the steps performed by the source master in the methods shown in figures 6, 9, 10 or 11 above. The communication device 12 provided in the embodiment of the present application may include modules corresponding to the respective steps.

In the embodiment of the present application, the communication device 12 may be divided into functional modules according to the above method example, for example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 12 shows a schematic diagram of a possible structure of the communication apparatus 12 in the present embodiment, in the case of dividing each functional module by corresponding functions. As shown in fig. 12, the communication device 12 includes a transmitting unit 121 and a receiving unit 122.

The sending unit 121 is configured to support the communication device 12 to perform the sending operation shown in fig. 6, 9, 10, or 11, for example: s600, S602, S702, etc., and/or other processes for the techniques described herein.

The receiving unit 122 is configured to support the communication device 12 to perform the receiving operations shown in fig. 6, 9, 10, or 11, for example: s601, S902, S1102', S1105, etc., and/or other processes for the techniques described herein.

All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

Of course, the communication device 12 provided in the embodiment of the present application includes, but is not limited to, the above modules, for example, the communication device 12 may further include a processing unit 123 and a storage unit 124.

The processing unit 123 is configured to support the communication device 12 to perform the operations of obtaining and the like shown in fig. 6, 9, 10, or 11, for example: s901, etc., and/or other processes for the techniques described herein.

The storage unit 124 may be used to store program codes of the communication apparatus 12, and may also be used to store network system information of the source secondary station.

The entity block diagram of the communication device 12 provided in the present application may refer to fig. 5 described above. The transmitting unit 121 and the receiving unit 122 may be the transceiver 53 in fig. 5, the processing unit 123 may be the processor 51 in fig. 5, and the storage unit 124 may be the memory 52 in fig. 5.

Another embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored, and when the instructions are executed on the communication apparatus 12, the communication apparatus 12 executes the steps of the source master station in the communication method according to the embodiment shown in fig. 6, fig. 9, fig. 10, or fig. 11.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the processor of the communication device 12 may read the computer executable instructions from the computer readable storage medium, and the processor executing the computer executable instructions causes the communication device 12 to perform the steps of the source master station in the communication method of the embodiment shown in fig. 6, 9, 10 or 11.

The embodiment of the present application provides a communication device 13, where the communication device 13 may be an object master station, and may also be a part of a device in the object master station, for example, a chip system in the object master station. Optionally, the system-on-chip is configured to support the target master station to implement the functions involved in the foregoing method embodiments, for example, to receive, transmit, or process data and/or information involved in the foregoing method. The chip system includes a chip and may also include other discrete devices or circuit structures.

The communication means 13 is arranged to perform the steps performed by the target master station in the method of figure 6, figure 9 or figure 10. The communication device 13 provided in the embodiment of the present application may include modules corresponding to the respective steps.

In the embodiment of the present application, the communication device 13 may be divided into functional modules according to the above method example, for example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 13 shows a schematic diagram of a possible configuration of the communication device 13, in the case of dividing the functional modules according to the respective functions. As shown in fig. 13, the communication device 13 includes a receiving unit 131 and a transmitting unit 132.

The receiving unit 131 is configured to support the communication device 13 to perform the receiving operation shown in fig. 6, 9 or 10, for example: s600, etc., and/or other processes for the techniques described herein.

The transmitting unit 132 is configured to support the communication device 13 to perform the transmitting operation shown in fig. 6, 9, or 10, for example: s601, etc., and/or other processes for the techniques described herein.

Of course, the communication device 13 provided in the embodiment of the present application includes, but is not limited to, the above modules, for example, the communication device 13 may further include a processing unit 133 and a storage unit 134.

The processing unit 133 is used to enable the communication device 13 to perform operations such as "reserve resources for terminals," and/or other processes for the techniques described herein.

The storage unit 134 may be used to store the program code of the communication apparatus 13, and may also be used to store the network system of the source master station, and the like.

The entity block diagram of the communication device 13 provided by the present application can refer to fig. 5 described above. The receiving unit 131 and the sending unit 132 may be the transceiver 53 in fig. 5, the processing unit 133 may be the processor 51 in fig. 5, and the storage unit 134 may be the memory 52 in fig. 5.

Another embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored, and when the instructions are executed on the communication apparatus 13, the communication apparatus 13 executes the steps of the target master station in the communication method according to the embodiment shown in fig. 6, 9 or 10.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the processor of the communication device 13 may read the computer executable instructions from the computer readable storage medium, and the processor executes the computer executable instructions to cause the communication device 13 to execute the steps of the target master station in the communication method of the embodiment shown in fig. 6, 9 or 10.

The embodiment of the present application provides a communication device 14, where the communication device 14 may be a terminal, or may be a part of a device in the terminal, such as a system on chip in the terminal. Optionally, the chip system is configured to support the terminal to implement the functions involved in the foregoing method embodiments, for example, to receive, send, or process data and/or information involved in the foregoing method. The chip system includes a chip and may also include other discrete devices or circuit structures.

The communication means 14 is adapted to perform the steps performed by the terminal in the method shown in fig. 6, 9, 10 or 11. The communication device 14 provided in the embodiment of the present application may include modules corresponding to the respective steps.

In the embodiment of the present application, the communication device 14 may be divided into functional modules according to the above method example, for example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 14 shows a schematic diagram of a possible configuration of the communication device 14, in the case of dividing the functional modules according to the respective functions. As shown in fig. 14, the communication device 14 includes a receiving unit 141, a processing unit 142, and a transmitting unit 143.

The receiving unit 141 is configured to support the communication device 14 to perform the receiving operations shown in fig. 6, 9, 10, or 11, for example: s602, S1102d, etc., and/or other processes for the techniques described herein.

The processing unit 114 is configured to support the communication device 11 to perform the operations of configuring, releasing, monitoring, etc. shown in fig. 6, 9, 10, or 11, for example: s603, S604, S605, S1100, S1101, S1102a, etc., and/or other processes for the techniques described herein.

The sending unit 142 is configured to support the communication device 14 to perform the sending operation shown in fig. 6, 9, 10, or 11, for example: s1102b, S1104, etc., and/or other processes for the techniques described herein.

Of course, the communication device 14 provided in the embodiment of the present application includes, but is not limited to, the above modules, for example, the communication device 14 may further include the storage unit 144. The memory unit 144 may be used to store program codes and data for the communication device 14.

The entity block diagram of the communication device 14 provided by the present application can refer to fig. 5 described above. The receiving unit 141 and the transmitting unit 143 may be the transceiver 53 in fig. 5, the processing unit 142 may be the processor 51 in fig. 5, and the storage unit 144 may be the memory 52 in fig. 5.

Another embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored, and when the instructions are executed on the communication device 14, the communication device 14 executes the steps of the terminal in the communication method according to the embodiment shown in fig. 6, fig. 9, fig. 10, or fig. 11.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the processor of communication device 14 may read the computer executable instructions from the computer readable storage medium, and the processor executes the computer executable instructions to cause communication device 14 to execute the steps of the terminal in the communication method of the embodiment shown in fig. 6, 9, 10 or 11.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any combination thereof. When implemented using a software program, may take the form of a computer program product, either entirely or partially. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data first access network device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A communication method is applied to a communication system comprising a first subsystem and a second subsystem, wherein the first subsystem comprises a source main station and a source auxiliary station, the source main station and the source auxiliary station provide services for a terminal, the second subsystem comprises a target main station, the network type of the target main station is the same as that of the source auxiliary station, and the communication method comprises the following steps:

the source master station sends a switching request message to the target master station, wherein the switching request message is used for requesting a terminal to be switched to the target master station and comprises network type information of the source auxiliary station;

the source main station receives a switching command from the target main station, wherein the switching command is used for indicating that a main cell group MCG of the target main station is configured according to configuration information of an auxiliary cell group SCG of the source auxiliary station;

and the source master station sends the switching command to the terminal.

2. The communication method according to claim 1,

the switching command comprises first configuration increment information, and the first configuration increment information is used for configuring the MCG of the target main station by combining with the configuration information of the SCG of the source auxiliary station;

or,

the switching command comprises first indication information, and the first indication information is used for indicating that the configuration information of the SCG of the source secondary station is used as the configuration information of the MCG of the target primary station.

3. The communication method according to claim 1 or 2, wherein the handover request message further includes information of a network type of the source master station, and the second subsystem further includes a target secondary station, and a network type of the target secondary station is the same as a network type of the source master station;

and the switching command is also used for indicating that the SCG of the target secondary station is configured according to the configuration information of the MCG of the source main station.

4. The communication method according to claim 3,

the switching command comprises second configuration increment information, and the second configuration increment information is used for configuring the SCG of the target secondary station by combining the configuration information of the MCG of the source primary station;

or,

the handover command includes second indication information, where the second indication information is used to indicate that the configuration information of the MCG of the source primary station is used as the configuration information of the SCG of the target secondary station.

5. The communication method according to any one of claims 1 to 4, wherein before the source master station transmits the handover request message to the target master station, the communication method further comprises:

the source master station acquires a target report, wherein the target report comprises a measurement report, or the target report comprises MCG failure information and a measurement report; the MCG failure information is used for indicating MCG failure of the source main station, and the measurement report is a report obtained by measurement based on measurement configuration information sent by the source main station or the source auxiliary station;

or,

the source main station receives information of the target main station from the source auxiliary station, the information of the target main station comprises an identifier of the target main station, or comprises an identifier of the target main station and an identifier of a target cell, and the target cell is a main service cell after the terminal is switched to the target main station.

6. The communication method of claim 5, wherein the source master station obtaining a target report comprises:

the source primary station receiving the target report from the source secondary station;

or,

the source master station receives the target report from the terminal through a split SRB.

7. The communication method according to any one of claims 1 to 6, wherein the source master station transmitting the handover command to the terminal includes:

the source main station sends the switching command to the terminal through the source auxiliary station;

or,

and the source master station sends the switching command to the terminal through the split SRB.

8. The communication method according to any one of claims 1 to 7,

the target master station and the source auxiliary station are the same device.

9. A communication method is applied to a communication system comprising a first subsystem and a second subsystem, wherein the first subsystem comprises a source main station and a source auxiliary station, the source main station and the source auxiliary station provide services for a terminal, the second subsystem comprises a target main station, the network type of the target main station is the same as that of the source auxiliary station, and the communication method comprises the following steps:

the target master station receives a switching request message from the source master station, wherein the switching request message is used for requesting a terminal to be switched to the target master station and comprises network type information of the source auxiliary station;

and the target master station sends a switching command to the source master station, wherein the switching command is used for indicating that the master cell group MCG of the target master station is configured according to the configuration information of the auxiliary cell group SCG of the source auxiliary station.

10. The communication method according to claim 9,

the handover command includes first configuration delta information; the first configuration increment information is used for configuring the MCG of the target master station by combining the configuration information of the SCG of the source auxiliary station;

or,

the switching command comprises first indication information; the first indication information is used for indicating that the configuration information of the SCG of the source secondary station is used as the configuration information of the MCG of the target main station.

11. The communication method according to claim 9 or 10, wherein the handover request message further includes information of a network type of the source primary station, and the second subsystem further includes a target secondary station, and a network type of the target secondary station is the same as a network type of the source primary station;

12. The communication method according to claim 11,

the handover command includes second configuration delta information; the second configuration increment information is used for indicating that the SCG of the target secondary station is configured by combining the configuration information of the MCG of the source main station;

or,

the handover command includes second indication information; the second indication information is used for indicating that the configuration information of the MCG of the source main station is used as the configuration information of the SCG of the target secondary station.

13. A communication method is applied to a communication system comprising a first subsystem and a second subsystem, wherein the first subsystem comprises a source main station and a source auxiliary station, the source main station and the source auxiliary station provide services for a terminal, the second subsystem comprises a target main station, the network type of the target main station is the same as that of the source auxiliary station, and the communication method comprises the following steps:

the terminal receives a switching command from the source main station, wherein the switching command is used for indicating that a main cell group MCG of the target main station is configured according to configuration information of an auxiliary cell group SCG of the source auxiliary station;

and responding to the switching command, and the terminal configures the MCG of the target main station according to the configuration information of the SCG of the source auxiliary station.

14. The communication method according to claim 13, wherein the second subsystem further includes a target secondary station, and a network standard of the target secondary station is the same as a network standard of the source primary station;

the switching command is also used for indicating that the SCG of the target secondary station is configured according to the configuration information of the MCG of the source main station;

the communication method further comprises:

and the terminal configures the SCG of the target secondary station according to the configuration information of the MCG of the source main station.

15. The communication method according to claim 13 or 14, wherein the handover command further includes a release indication for indicating release of the configured SRB3 or capability information for indicating that the target secondary station does not support SRB 3; the communication method further comprises:

the terminal releases the configured SRB 3.

16. The communication method according to any one of claims 13 to 15, wherein the receiving, by the terminal, the handover command from the source master station includes:

the terminal receives the switching command sent by the source main station through a split Signaling Radio Bearer (SRB);

or,

the terminal receives the handover command transmitted through the source secondary station through SRB 3.

17. The communication method according to any one of claims 13 to 16, wherein before the terminal receives the handover command from the source master station, the communication method further comprises:

the terminal sends a target report to the source master station through the split SRB;

or,

the terminal sends a target report to the source secondary station through an SRB 3;

the target report is used to determine the target master station, and the target report includes a measurement report, or the target report includes MCG failure information and a measurement report, where the MCG failure information is used to indicate MCG failure of the source master station, and the measurement report is a report measured based on measurement configuration information sent by the source master station or the source secondary station.

18. The communication method according to claim 16 or 17, characterized in that the communication method further comprises:

the terminal acquires target configuration information through the SRB3, wherein the target configuration information is used for configuring the split SRB;

and the terminal carries out configuration according to the target configuration information and establishes the split SRB.

19. The communication method according to claim 18, wherein the terminal obtains the target configuration information through SRB3, comprising:

the terminal sends a setup instruction to the source secondary station through the SRB3, wherein the setup instruction is used for triggering the setup of the split SRB;

the terminal receives the target configuration information from the source secondary station through the SRB 3.

20. A communication device, comprising a processor, coupled to a memory, for reading and executing instructions in the memory to implement the communication method of any one of claims 1 to 8.

21. A communication device, comprising a processor, coupled to a memory, for reading and executing instructions in the memory to implement the communication method of any one of claims 9-12.

22. A communication device, comprising a processor, coupled to a memory, for reading and executing instructions in the memory to implement the communication method of any one of claims 13-19.

23. A communication system, characterized in that the communication system comprises a communication device according to claim 20, a communication device according to claim 21 and a communication device according to claim 22.

24. A computer-readable storage medium having instructions stored therein; the instructions, when executed on a communication device, cause the communication device to perform a communication method as claimed in any one of claims 1 to 8, or to perform a communication method as claimed in any one of claims 9 to 12, or to perform a communication method as claimed in any one of claims 13 to 19.