CN110710143B

CN110710143B - Method and terminal equipment for processing Radio Link Failure (RLF)

Info

Publication number: CN110710143B
Application number: CN201880036995.3A
Authority: CN
Inventors: 石聪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-02-08
Filing date: 2018-02-08
Publication date: 2021-01-12
Anticipated expiration: 2038-02-08
Also published as: CN110710143A; WO2019153209A1

Abstract

The embodiment of the application discloses a method and terminal equipment for processing Radio Link Failure (RLF), wherein the method comprises the following steps: under the condition that the duplicated data transmission function of the first radio bearer is in a deactivated state and the data of the first radio bearer reaches the maximum retransmission times on a first Radio Link Control (RLC) entity corresponding to the first radio bearer, or under the condition that the duplicated data transmission function of the first radio bearer is in a deactivated state and the data of the second radio bearer reaches the maximum retransmission times on a third RLC entity corresponding to the second radio bearer, the terminal equipment switches the RLC entity for transmitting the data from the first RLC entity to the second RLC entity corresponding to the first radio bearer, wherein the carrier mapped by the first RLC entity at least partially overlaps with the carrier mapped by the third RLC entity. The method and the terminal equipment of the embodiment of the application are beneficial to improving the reliability of data transmission.

Description

Method and terminal equipment for processing Radio Link Failure (RLF)

Technical Field

The present embodiments relate to the field of communications, and in particular, to a method and a terminal device for handling Radio Link Failure (RLF).

Background

In a carrier aggregation scenario, a Packet Data Convergence Protocol (PDCP) entity corresponding to a radio bearer may support a function of Data transmission replication, that is, one PDCP Protocol Data Unit (PDU) is replicated into two parts, so as to improve reliability of Data transmission. In a case where a duplicated data transmission function of a certain Radio bearer is in a deactivated state, Radio Link Failure (RLF) occurs, and how the terminal device should deal with the RLF is not yet referred to in the present discussion.

Disclosure of Invention

In view of this, embodiments of the present application provide a method and a terminal device for handling radio link failure RLF, which are beneficial to improving reliability of data transmission.

In a first aspect, a method for handling radio link failure, RLF, is provided, the method including: under the condition that the duplicated data transmission function of the first radio bearer is in a deactivated state and the data of the first radio bearer reaches the maximum retransmission times on a first Radio Link Control (RLC) entity corresponding to the first radio bearer, or under the condition that the duplicated data transmission function of the first radio bearer is in a deactivated state and the data of the second radio bearer reaches the maximum retransmission times on a third RLC entity corresponding to the second radio bearer, the terminal equipment switches the RLC entity for transmitting the data from the first RLC entity to the second RLC entity corresponding to the first radio bearer, wherein the carrier mapped by the first RLC entity at least partially overlaps with the carrier mapped by the third RLC entity.

In one possible implementation, the method further includes: the terminal equipment sends indication information to the network equipment, wherein the indication information is used for indicating that the first radio bearer has Radio Link Failure (RLF).

In one possible implementation, the second radio bearer has a duplicate data transmission function, or the second radio bearer does not have a duplicate data transmission function.

In one possible implementation, the first radio bearer and the second radio bearer correspond to the same cell group or to different cell groups.

In one possible implementation, the cell group includes a master cell group MCG and/or a secondary cell group SCG.

In a possible implementation manner, if the first RLC entity reaches the maximum retransmission number, the working mode of the first RLC entity is an acknowledged mode AM; or if the third RLC entity reaches the maximum retransmission number, the working mode of the third RLC entity is an acknowledged mode AM, and the working mode of the RLC entity corresponding to the first radio bearer is an acknowledged mode AM or an unacknowledged mode UM.

In a possible implementation manner, the first RLC entity is a primary link of the first radio bearer, and the second RLC entity is a secondary link of the first radio bearer.

In a second aspect, a terminal device is provided, configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the terminal device comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.

In a third aspect, a terminal device is provided, which includes: memory, processor, input interface and output interface. The memory, the processor, the input interface and the output interface are connected through a bus system. The memory is configured to store instructions and the processor is configured to execute the instructions stored by the memory for performing the method of the first aspect or any possible implementation manner of the first aspect.

In a fourth aspect, there is provided a computer storage medium storing computer software instructions for executing the method of the first aspect or any possible implementation manner of the first aspect, and containing a program designed for executing the above aspect.

In a fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect or any of the alternative implementations of the first aspect.

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

Drawings

Fig. 1 is a schematic diagram illustrating an application scenario according to an embodiment of the present application.

Fig. 2 shows a protocol architecture diagram in a carrier aggregation scenario.

Fig. 3 shows a schematic block diagram of a method of handling radio link failure, RLF, according to an embodiment of the present application.

Fig. 4 shows a schematic block diagram of a terminal device according to an embodiment of the present application.

Fig. 5 shows another schematic block diagram of a terminal device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

It should be understood that the technical solutions of the embodiments of the present application may be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a long term evolution LTE System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile telecommunications System (Universal Mobile telecommunications System, UMTS), a UMTS Worldwide Interoperability for Microwave Access (WiMAX) communication System, a New Radio (New Radio, NR), a future 5G System, and the like.

In particular, the technical solution of the embodiment of the present application may be applied to various communication systems based on a non-orthogonal Multiple Access technology, such as a Sparse Code Multiple Access (SCMA) system, a Low Density Signature (LDS) system, and the like, and certainly the SCMA system and the LDS system may also be called other names in the communication field; further, the technical solution of the embodiment of the present application may be applied to a Multi-Carrier transmission system using a non-Orthogonal multiple access technology, for example, an Orthogonal Frequency Division Multiplexing (OFDM) using a non-Orthogonal multiple access technology, a Filter Bank Multi-Carrier (FBMC), a General Frequency Division Multiplexing (GFDM), a Filtered Orthogonal Frequency Division Multiplexing (F-OFDM) system, and the like.

A terminal device in the embodiments of the present application may refer to a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, and the embodiments of the present application are not limited thereto.

The Network device in this embodiment may be a device for communicating with a terminal device, where the Network device may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in a WCDMA system, an evolved node b (eNB or eNodeB) in an LTE system, a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or a relay Station, an Access point, a vehicle-mounted device, a wearable device, a Network device in a future 5G Network, or a Network device in a future evolved PLMN Network, and the like, and the embodiment of the present application is not limited.

Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application. The communication system in fig. 1 may include a terminal device 10 and a network device 20. The network device 20 is used to provide a communication service to the terminal device 10 and access a core network, and the terminal device 10 accesses the network by searching for a synchronization signal, a broadcast signal, or the like transmitted by the network device 20, thereby performing communication with the network. The arrows shown in fig. 1 may represent uplink/downlink transmissions over a cellular link between the terminal device 10 and the network device 20.

In a carrier aggregation scenario, the PDCP entity may support a data duplication function, that is, the data duplication function of the PDCP entity is utilized, so that duplicated data is respectively transmitted to two Radio Link Control (RLC) entities (corresponding to two different logical channels), and it is finally ensured that the duplicated PDCP PDUs can be transmitted on aggregated carriers of different physical layers, thereby achieving a frequency diversity gain and improving reliability of data transmission.

A specific protocol structure will be described below with reference to fig. 2. As shown in fig. 2, a PDCP entity corresponding to a certain radio bearer has a split bearer replication function, and copies and encapsulates a Data process of a PDCP Service Data Unit (SDU) into a PDCP PDU1 and a PDCP PDU2, where the PDCP PDU1 and the PDCP PDU2 have the same content, that is, the Data payload and the header of the bearer are the same. The PDCP PDU1 and the PDCP PDU2 are respectively mapped to different Radio Link Control (RLC) entities, that is, the PDCP PDU1 is transmitted to the RLC entity 1, and the PDCP PDU2 is transmitted to the RLC entity 2, where different RLC entities correspond to different logical channels, and for Media Access Control (MAC), after knowing which logical channels transmit duplicated data of the same PDCP PDU, the duplicated data are transmitted on different carriers, for example, the duplicated data transmitted in the RLC entity 1 is transmitted on a physical carrier 1, and the duplicated data transmitted in the RLC entity 2 is transmitted on a physical carrier 2.

In case that the duplicated data transmission function of a certain radio bearer is in a deactivated state, a radio link failure RLF occurs, and how the terminal device should cope with the RLF is not yet referred to in the present discussion.

Fig. 3 shows a schematic block diagram of a method 100 of handling radio link failure, RLF, of an embodiment of the application. As shown in fig. 3, the method 100 includes:

s110, when the duplicate data transmission function of the first radio bearer is in a deactivated state and the data of the first radio bearer reaches the maximum retransmission times on the first Radio Link Control (RLC) entity corresponding to the first radio bearer, or

Under the condition that a duplicate data transmission function of a first radio bearer is in a deactivated state and data of a second radio bearer reaches a maximum retransmission number on a third RLC entity corresponding to the second radio bearer, the terminal equipment switches the RLC entity used for transmitting the data from the first RLC entity to the second RLC entity corresponding to the first radio bearer, wherein carriers mapped by the first RLC entity are at least partially overlapped with carriers mapped by the third RLC entity.

It should be noted that different radio bearers correspond to different PDCP entities, a PDCP entity having a duplicate data transmission function may be configured to correspond to two RLC entities, and the duplicate data transmission function of the PDCP entity may also be referred to as a duplicate data transmission function of a radio bearer.

When the duplicate data transmission function of the first radio bearer is in a deactivated state, the terminal device determines that the first radio bearer has RLF. That is to say, the terminal device may be performing non-duplicate data transmission by using a certain RLC entity corresponding to the first radio bearer, which has undergone RLF. The occurrence of RLF for the first radio bearer may be triggered by the maximum number of retransmissions being reached on a first RLC entity corresponding to the first radio bearer in which non-duplicated data transmission is performed, or triggered by the maximum number of retransmissions being reached on a third RLC entity corresponding to a second radio bearer, wherein carriers mapped by the third RLC entity at least partially overlap carriers mapped by the first RLC entity. For example, the carriers mapped by the third RLC entity and the carriers mapped by the first RLC entity may be subsets of each other. After the first radio bearer has RLF, the terminal device may stop using the RLC entity with RLF corresponding to the first radio bearer to perform data transmission, and use the RLC entity without RLF corresponding to the first radio bearer to perform data transmission. For example, when the duplicate data transmission function of the first radio bearer is in a deactivated state, the link corresponding to the first RLC entity corresponding to the first radio bearer has RLF, and then the terminal device may switch the RLC entity for transmitting data corresponding to the first radio bearer from the first RLC entity to the second RLC entity corresponding to the first radio bearer.

Therefore, the method for processing the radio link RLF in the embodiment of the application is beneficial to improving the reliability of data transmission.

Alternatively, the maximum number of retransmissions of data transmitted on a certain RLC entity means that the operation Mode of the RLC entity may be an Acknowledged Mode (AM). In other words, in RLC AM mode, the retransmission counter corresponding to a certain RLC SDU reaches the configured threshold.

Optionally, the second radio bearer may have a duplicate data transmission function, or may not have the duplicate data transmission function.

Optionally, the carrier mapped by the first RLC entity at least partially overlaps with a carrier mapped by a third RLC entity corresponding to the second radio bearer, for example, the carriers may correspond to at least one same secondary cell. The first radio bearer and the second radio bearer may also belong to the same or different Cell groups, e.g., a Master Cell Group (MCG) and/or a Secondary Cell Group (SCG).

Optionally, if the RLF of the first radio bearer occurs on a third RLC entity corresponding to the second radio bearer and the maximum number of retransmissions is reached, the operating Mode of the third RLC entity is an AM Mode, and the operating Mode of the RLC entity corresponding to the first radio bearer may be an AM Mode or an Unacknowledged Mode (UM).

Optionally, a link corresponding to the first RLC entity is a primary link, and a link corresponding to the second RLC entity is a secondary link, that is, when the duplicated data transmission function of the first radio bearer is in a deactivated state, the default RLC entity configured by the network device is used by the first RLC entity for data transmission, and the default unused RLC entity configured by the network device is the second RLC entity.

If the main link has RLF, stopping submitting data to the RLC entity corresponding to the main link and submitting data to the RLC entity corresponding to the auxiliary link, wherein the auxiliary link is automatically changed into the main link at the moment; and if the secondary link generates the RLF, stopping delivering the data to the RLC entity corresponding to the secondary link and delivering the data to the RLC entity corresponding to the main link.

Optionally, in an embodiment of the present application, the method further includes: and the terminal equipment sends indication information to network equipment, wherein the indication information is used for indicating that the first radio bearer has Radio Link Failure (RLF). That is to say, the terminal device may report to the network device when determining that a certain radio bearer has RLF, and specifically, the terminal device may also report to the network device which link triggered the radio bearer having RLF.

It should be understood that the interaction between the network device and the terminal device described by the network device and the related characteristics, functions, etc. correspond to the related characteristics, functions of the terminal device. And related matters have been described in detail in the method 100, and are not repeated herein for brevity.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should also be understood that the term "and/or" herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Having described the method for handling radio link failure RLF according to the embodiment of the present application in detail, an apparatus for handling radio link failure RLF according to the embodiment of the present application will be described below with reference to fig. 4 and 5, and the technical features described in the embodiment of the method are applicable to the following embodiments of the apparatus.

Fig. 4 shows a schematic block diagram of a terminal device 200 according to an embodiment of the present application. As shown in fig. 4, the terminal device 200 includes:

a processing unit 210, configured to, in a case that a duplicate data transmission function of a first radio bearer is in a deactivated state and data of the first radio bearer reaches a maximum retransmission number on a first radio link control RLC entity corresponding to the first radio bearer, or

And under the condition that the duplicated data transmission function of the first radio bearer is in a deactivated state and the data of the second radio bearer reaches the maximum retransmission times on a third RLC entity corresponding to the second radio bearer, switching the RLC entity for transmitting the data from the first RLC entity to the second RLC entity corresponding to the first radio bearer, wherein the carrier mapped by the first RLC entity at least partially overlaps with the carrier mapped by the third RLC entity.

Therefore, the terminal device of the embodiment of the application is beneficial to improving the reliability of data transmission.

Optionally, in this embodiment of the present application, the terminal device further includes: a sending unit, configured to send indication information to the network device, where the indication information is used to indicate that the radio link failure RLF occurs in the first radio bearer.

Optionally, in this embodiment of the present application, the second radio bearer has a duplicate data transmission function, or the second radio bearer does not have a duplicate data transmission function.

Optionally, in this embodiment, the first radio bearer and the second radio bearer correspond to the same cell group or different cell groups.

Optionally, in this embodiment, the cell group includes a master cell group MCG and/or a secondary cell group SCG.

Optionally, in this embodiment of the present application, if the first RLC entity reaches the maximum retransmission number, the working mode of the first RLC entity is an acknowledged mode AM; or if the third RLC entity reaches the maximum retransmission number, the working mode of the third RLC entity is an acknowledged mode AM, and the working mode of the RLC entity corresponding to the first radio bearer is an acknowledged mode AM or an unacknowledged mode UM.

Optionally, in this embodiment of the present application, the first RLC entity is a primary link of the first radio bearer, and the second RLC entity is a secondary link of the first radio bearer.

It should be understood that the terminal device 200 according to the embodiment of the present application may correspond to the terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the terminal device 200 are respectively for implementing the corresponding flow of the terminal device in the method of fig. 3, and are not described herein again for brevity.

As shown in fig. 5, an embodiment of the present application further provides a terminal device 300, where the terminal device 300 may be the terminal device 200 in fig. 4, and can be used to execute the content of the terminal device corresponding to the method 100 in fig. 3. The terminal device 300 includes: an input interface 310, an output interface 320, a processor 330 and a memory 340, the input interface 310, the output interface 320, the processor 330 and the memory 340 being connectable via a bus system. The memory 340 is used to store programs, instructions or code. The processor 330 is used to execute the program, instructions or codes in the memory 340 to control the input interface 310 to receive signals, control the output interface 320 to send signals, and perform the operations of the foregoing method embodiments.

It should be understood that, in the embodiment of the present Application, the Processor 330 may be a Central Processing Unit (CPU), and the Processor 330 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 340 may include both read-only memory and random access memory, and provides instructions and data to the processor 330. A portion of memory 340 may also include non-volatile random access memory. For example, the memory 340 may also store device type information.

In implementation, the various aspects of the methods described above may be performed by instructions in the form of hardware, integrated logic circuits, or software in the processor 330. The contents of the method disclosed in connection with the embodiments of the present application may be directly embodied as a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 340, and the processor 330 reads the information in the memory 340 and implements the content of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.

In a specific embodiment, the processing unit of the terminal device 200 may be implemented by the processor 330 in fig. 5, and the transmitting unit of the terminal device 200 may be implemented by the output interface 320 in fig. 5.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the unit is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, 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 or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. 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.

This functionality, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of 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 for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall 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 method of handling radio link failure, RLF, comprising:

under the condition that a duplicate data transmission function of a first radio bearer is in a deactivated state and data of a second radio bearer reaches a maximum retransmission number on a third Radio Link Control (RLC) entity corresponding to the second radio bearer, a terminal device switches the RLC entity for transmitting the data from a first RLC entity corresponding to the first radio bearer to a second RLC entity corresponding to the first radio bearer, wherein carriers mapped by the first RLC entity at least partially overlap carriers mapped by the third RLC entity.

2. The method of claim 1, further comprising:

and the terminal equipment sends indication information to network equipment, wherein the indication information is used for indicating that the first radio bearer has RLF.

3. The method according to claim 1 or 2, wherein the second radio bearer has a duplicate data transmission function, or wherein the second radio bearer does not have a duplicate data transmission function.

4. The method of claim 1 or 2, wherein the first radio bearer and the second radio bearer correspond to a same group of cells or to different groups of cells.

5. The method according to claim 4, wherein the cell group comprises a Master Cell Group (MCG) and/or a Secondary Cell Group (SCG).

6. The method of claim 1 or 2, wherein if the third RLC entity reaches the maximum retransmission number, the operating mode of the third RLC entity is acknowledged mode AM, and the operating mode of the RLC entity corresponding to the first radio bearer is acknowledged mode AM or unacknowledged mode UM.

7. The method of claim 1 or 2, wherein the first RLC entity is a primary link of the first radio bearer and the second RLC entity is a secondary link of the first radio bearer.

8. A terminal device, characterized in that the terminal device comprises:

the radio link control device comprises a processing unit and a processing unit, wherein the processing unit is used for switching an RLC entity for transmitting data from a first RLC entity corresponding to a first radio bearer to a second RLC entity corresponding to the first radio bearer under the condition that a duplicated data transmission function of the first radio bearer is in a deactivated state and data of a second radio bearer reaches a maximum retransmission number on a third RLC entity corresponding to the second radio bearer, and carriers mapped by the first RLC entity and carriers mapped by the third RLC entity at least partially overlap.

9. The terminal device according to claim 8, wherein the terminal device further comprises:

a sending unit, configured to send indication information to a network device, where the indication information is used to indicate that a Radio Link Failure (RLF) occurs in the first radio bearer.

10. A terminal device according to claim 8 or 9, wherein the second radio bearer has a duplicate data transfer function, or wherein the second radio bearer does not have a duplicate data transfer function.

11. The terminal device of claim 8 or 9, wherein the first radio bearer and the second radio bearer correspond to the same group of cells or to different groups of cells.

12. Terminal device according to claim 11, wherein the cell group comprises a master cell group, MCG, and/or a secondary cell group, SCG.

13. The terminal device of claim 8 or 9, wherein if the third RLC entity reaches the maximum retransmission number, the working mode of the third RLC entity is acknowledged mode AM, and the working mode of the RLC entity corresponding to the first radio bearer is acknowledged mode AM or unacknowledged mode UM.

14. A terminal device according to claim 8 or 9, wherein the first RLC entity is a primary link of the first radio bearer and the second RLC entity is a secondary link of the first radio bearer.

15. A terminal device, characterized in that the terminal device comprises: memory, processor, input interface and output interface, wherein the memory, the processor, the input interface and the output interface are connected by a bus system, the memory is used for storing instructions, and the processor is used for executing the instructions stored by the memory and executing the method according to any one of claims 1 to 7.

16. A computer storage medium storing computer software instructions for performing the method of any one of claims 1 to 7.