WO2023036038A1 - Communication method and apparatus - Google Patents

Abstract

The present application relates to the technical field of communications, and discloses a communication method and apparatus capable of flexibly configuring radio link control protocol (RLC) parameters of a radio bearer (RB) application and reducing the signaling overhead of RLC parameter reconfiguration. The method comprises: receiving indication information from a network device, where the indication information is used for indicating one of multiple sets of RLC parameters, and polling retransmission timers included in the multiple sets of RLC parameters have different timing durations; and determining the RLC parameter of the RB application according to the indication information.

Description

A communication method and device

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202111066913.X and the application name "A Communication Method and Device" submitted to the China Patent Office on September 13, 2021, the entire contents of which are incorporated in this application by reference middle.

technical field

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

Background technique

In order to improve the reliability of service transmission and avoid data loss as much as possible, the radio link control (radio link control, RLC) layer in the new radio (new radio, NR) user plane protocol stack provides confirmation mode (acknowledge mode, AM) transmission Mode, the main content of this AM transmission mode is: the sending end RLC will trigger polling (polling) according to the rules stipulated in the protocol, and the receiving end RLC will reply a status report to the sending end after receiving the polling from the sending end, indicating which data packets are received Success, which data packets fail to be received, so that the sending end RLC can retransmit the failed data packets based on the status report.

If the RLC at the receiving end cannot normally reply to the sending end with a status report due to untimely scheduling or air interface error codes, etc., the sending end will trigger polling retransmission. After polling retransmission reaches the maximum number of times, it will trigger the RLC maximum retransmission call drop.

However, currently, for data transmission between a terminal device and a network device, the network device only sends a set of RLC parameters to the terminal device when the radio bearer is established. When a change occurs, in order to prevent the terminal device from dropping calls, the network device needs to reconfigure the RLC parameters of the terminal device through a reconfiguration message, and the signaling overhead is large, especially when a large number of terminal devices in the entire cell need to be reconfigured Sending a large number of reconfiguration messages may also affect the normal service data transmission of the terminal device.

Contents of the invention

Embodiments of the present application provide a communication method and device, which can flexibly configure RLC parameters for radio bearer (radio bearer, RB) applications, and reduce signaling overhead for RLC parameter reconfiguration.

In a first aspect, an embodiment of the present application provides a communication method, the method includes: receiving indication information from a network device, where the indication information is used to indicate a set of RLC parameters among multiple sets of radio link control protocol RLC parameters, the The polling retransmission timers included in the multiple sets of RLC parameters have different timing durations; according to the indication information, determine the RLC parameters for the radio bearer RB application. Optionally, the RB is a signaling radio bearer (SRB) or a data radio bearer (DRB).

Using the above method, when the RLC parameters applied by the RB need to be changed, the RB can be instructed to switch the applied RLC parameters between multiple sets of RLC parameters through the indication information, and there is no need to reconfigure the RLC parameters, which can reduce the signaling of RLC parameter reconfiguration At the same time, the polling retransmission timer included in multiple sets of RLC parameters has different timing lengths, and the network device can flexibly configure the RLC parameters applied by the RB, thereby reducing the maximum RLC retransmission call drop and saving air interface resources.

In a possible design, the method further includes: receiving configuration information from the network device, where the configuration information is used to configure the multiple sets of RLC parameters.

In the above design, the network device can configure multiple sets of RLC parameters for the RB during the RB creation stage, which is beneficial to instruct the terminal device to switch the RLC applied by the RB among multiple sets of RLC when it is necessary to change the RLC parameters applied by the RB. parameters to reduce signaling overhead.

In a possible design, the method further includes: using one set of RLC parameters in the multiple sets of RLC parameters as the RLC parameters initially applied by the RB.

In the above design, one set of RLC parameters among multiple sets of RLC parameters can be pre-configured through network device configuration, protocol configuration, etc. The RLC parameter 1 is a default RLC parameter initially applied by the RB, which helps to ensure normal data transmission of the RB.

In a possible design, the RLC parameters further include one or more of the following: the threshold value of the number of bytes triggering polling, the threshold value of the number of PDUs triggering polling, and the prohibition of sending status The timing duration of the report timer and the timing duration of the RLC reassembly timer.

In the above design, not only the timing of the polling retransmission timer of the RB application can be changed according to the requirements, but also the threshold value of the number of bytes triggering polling and the number of PDUs triggering polling of the RB application can be changed according to requirements. RLC parameters such as the threshold value, the timing duration of the timer for prohibiting sending status reports, and the timing duration of the RLC reassembly timer, etc., thereby reducing call drops caused by untimely network equipment scheduling or short-term bit errors on the air interface.

In a possible design, the indication information may be transmitted by a media access control layer control unit MAC CE.

In the above design, the transmission of the indication information through the MAC CE can reduce the signaling overhead and improve the efficiency of changing the RLC parameters applied by the RB, compared with the transmission of the indication information through the RRC reconfiguration message.

In a second aspect, the embodiment of the present application provides a communication method, the method includes: generating indication information, the indication information is used to indicate a set of RLC parameters among multiple sets of radio link control protocol RLC parameters, and the multiple sets of RLC parameters The timing duration of the polling retransmission timer included in the parameter is different; and the indication information is sent to the terminal device.

Using the above method, when the RLC parameters applied by the RB need to be changed, the RB can be instructed to switch the applied RLC parameters between multiple sets of RLC parameters through the indication information, and there is no need to reconfigure the RLC parameters, which can reduce the signaling of RLC parameter reconfiguration At the same time, the polling retransmission timer included in multiple sets of RLC parameters has different timing lengths, and the network device can flexibly configure the RLC parameters applied by the RB, thereby reducing the maximum RLC retransmission call drop and saving air interface resources.

In a possible design, the method further includes: sending configuration information to the terminal device, where the configuration information is used to configure the multiple sets of RLC parameters.

In the above design, the network device can configure multiple sets of RLC parameters for the RB during the RB creation stage, which is beneficial to instruct the terminal device to switch the RLC applied by the RB among multiple sets of RLC when it is necessary to change the RLC parameters applied by the RB. parameters to reduce signaling overhead.

In a possible design, before generating the indication information, it further includes confirming that at least one of the following conditions is met: the amount of data transmitted by the radio bearer RB corresponding to the terminal device within the first duration is greater than or equal to the first Threshold value; the number of connected terminal devices is greater than or equal to the second threshold value. Optionally, the RB is a signaling radio bearer (SRB) or a data radio bearer (DRB).

In the above design, the network device can change the RLC parameters of the RB application according to the actual situation in scenarios such as a large number of access terminal devices and peak transmission, such as appropriately increasing the timing of the polling retransmission timer and/or prohibiting sending The timing duration of the status report timer, etc., reduces the maximum retransmission call drop of RLC and saves air interface resources.

In a possible design, the RLC parameters further include one or more of the following: the threshold value of the number of bytes triggering polling, the threshold value of the number of PDUs triggering polling, and the prohibition of sending status The timing duration of the report timer and the timing duration of the RLC reassembly timer.

In the above design, not only the timing of the polling retransmission timer of the RB application can be changed according to the requirements, but also the threshold value of the number of bytes triggering polling and the number of PDUs triggering polling of the RB application can be changed according to requirements. RLC parameters such as the threshold value, the timing duration of the timer for prohibiting sending status reports, and the timing duration of the RLC reassembly timer, etc., thereby reducing call drops caused by untimely network equipment scheduling or short-term bit errors on the air interface.

In a possible design, the indication information may be transmitted by a media access control layer control unit MAC CE.

In the above design, the transmission of the indication information through the MAC CE can reduce the signaling overhead and improve the efficiency of changing the RLC parameters applied by the RB, compared to the transmission of the indication information through the RRC reconfiguration message.

In the third aspect, the embodiment of the present application provides a communication device, which has the function of realizing the above-mentioned first aspect or any possible design method of the first aspect, and the function can be realized by hardware, or by hardware Execute the corresponding software implementation. The hardware or software includes one or more modules (or units) corresponding to the above functions, such as an interface unit and a processing unit.

In one possible design, the device may be a chip or an integrated circuit.

In a possible design, the device includes a memory and a processor, and the memory is used to store a program executed by the processor. When the program is executed by the processor, the device can perform any of the above-mentioned first aspect or the first aspect. One possible approach in the design.

In a possible design, the device may be a terminal device.

In the fourth aspect, the embodiment of the present application provides a communication device, which has the function of realizing the above-mentioned second aspect or any possible design method of the second aspect, and the function can be realized by hardware, or can be realized by hardware Execute the corresponding software implementation. The hardware or software includes one or more modules (or units) corresponding to the above functions, such as an interface unit and a processing unit.

In one possible design, the device may be a chip or an integrated circuit.

In a possible design, the device includes a memory and a processor, and the memory is used to store a program executed by the processor. When the program is executed by the processor, the device can perform any of the above-mentioned second aspect or the second aspect. One possible approach in design.

In one possible design, the device may be a network device.

In the fifth aspect, the embodiment of the present application provides a communication system, the communication system includes a terminal device and a network device, and the terminal device can execute the method in the above-mentioned first aspect or any possible design of the first aspect, The network device may execute the second aspect or the method in any possible design of the second aspect.

In the sixth aspect, the embodiments of the present application provide a computer-readable storage medium, in which computer programs or instructions are stored, and when the computer programs or instructions are executed, the above-mentioned first aspect or the first aspect can be realized The method described in any possible design of the above-mentioned second aspect or the method described in any possible design of the second aspect.

In the seventh aspect, the embodiment of the present application also provides a computer program product, including computer programs or instructions, when the computer programs or instructions are executed, it can realize the above-mentioned first aspect or any possible design of the first aspect. The method described above, or the method described in implementing the second aspect or any possible design of the second aspect.

In the eighth aspect, the embodiment of the present application also provides a chip, the chip is coupled with the memory, and is used to read and execute the programs or instructions stored in the memory to realize the above first aspect or any possibility of the first aspect The method described in the design, or the method described in the second aspect or any possible design of the second aspect.

For the technical effects that can be achieved by any possible design in any one of the above-mentioned third to eighth aspects, please refer to the technical effects that can be achieved by the corresponding designs in the above-mentioned first aspect or second aspect, and will not be repeated here.

Description of drawings

FIG. 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a user plane protocol stack provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of the RLC polling process under the ARQ mechanism provided by the embodiment of the present application;

FIG. 4 is a schematic diagram of an existing RLC parameter configuration mechanism provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a communication method provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of a polling triggering scenario provided by an embodiment of the present application;

FIG. 7 is one of the RLC parameter configuration schematic diagrams provided by the embodiment of the present application;

FIG. 8 is the second schematic diagram of RLC parameter configuration provided by the embodiment of the present application;

FIG. 9 is one of the schematic diagrams of the communication device provided by the embodiment of the present application;

FIG. 10 is a second schematic diagram of a communication device provided by an embodiment of the present application.

Detailed ways

FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application. As shown in FIG. 1 , the communication system 1000 includes a radio access network 100 and a core network 200 . Optionally, the communication system 1000 may also include the Internet 300 . Wherein, the radio access network 100 may include at least one network device, such as 110a and 110b in FIG. 1 , and may also include at least one terminal device, such as 120a-120j in FIG. 1 . Wherein, 110a is a base station, 110b is a micro station, 120a, 120e, 120f and 120j are mobile phones, 120b is a car, 120c is a fuel dispenser, 120d is a home access point (HAP) arranged indoors or outdoors, 120g is a laptop, 120h is a printer, and 120i is a drone. Wherein, the same terminal device or network device may provide different functions in different application scenarios. For example, the mobile phones in Figure 1 include 120a, 120e, 120f and 120j. The mobile phone 120a can connect to the base station 110a, connect to the car 120b, directly communicate with the mobile phone 120e, and access the HAP. The mobile phone 120e can access the HAP and communicate with the mobile phone 120a. For direct communication, the mobile phone 120f can be connected to the micro station 110b, connected to the laptop 120g, connected to the printer 120h, and the mobile phone 120j can control the drone 120i.

The terminal device is connected to the network device, and the network device is connected to the core network. Core network equipment and network equipment can be independent and different physical equipment, or the functions of the core network equipment and the logical functions of the network equipment can be integrated on the same physical equipment, or a physical equipment can integrate part of the core network equipment. device functions and functions of some network devices. Terminal devices and network devices may be connected to each other in a wired or wireless manner. FIG. 1 is only a schematic diagram. The communication system may also include other devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1 .

Network equipment, also known as wireless access network equipment, can be base station (base station), evolved base station (evolved NodeB, eNodeB), transmission reception point (transmission reception point, TRP), fifth generation (5th generation, 5G ) next generation NodeB (next generation NodeB, gNB) in the mobile communication system, base station in the sixth generation (6th generation, 6G) mobile communication system, base station in the future mobile communication system or access node in the WiFi system, etc.; It may also be a module or unit that completes some functions of the base station, for example, it may be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and also completes the function of the service data adaptation protocol (SDAP); the DU completes the functions of the base station The functions of the radio link control layer and the medium access control (medium access control, MAC) layer can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of the above-mentioned protocol layers, you can refer to the third generation partnership project (3rd generation partnership project, 3GPP) related technical specifications. The network device may be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), or a relay node or a donor node. The embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.

A terminal device may also be called a terminal, a user equipment (user equipment, UE), a mobile station, a mobile terminal, and the like. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (internet of things, IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. Terminal devices can be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiment of the present application does not limit the specific technology and specific device form adopted by the terminal device.

Network equipment and terminal equipment can be fixed or mobile. Network equipment and terminal equipment can be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and artificial satellites in the air. The embodiments of the present application do not limit the application scenarios of the network device and the terminal device.

The roles of network equipment and terminal equipment may be relative. For example, the helicopter or UAV 120i in FIG. 1 may be configured as a mobile network equipment. , the terminal device 120i is a network device; but for the network device 110a, 120i is a terminal device, that is, communication between 110a and 120i is performed through a wireless air interface protocol. Of course, communication between 110a and 120i may also be performed through an interface protocol between network devices. In this case, compared to 110a, 120i is also a network device. Therefore, both network equipment and terminal equipment can be collectively referred to as communication devices, 110a and 110b in FIG. 1 can be referred to as communication devices with network device functions, and 120a-120j in FIG. 1 can be referred to as communication devices with terminal device functions .

Communication between network devices and terminal devices, between network devices and network devices, between terminal devices and terminal devices can be performed through licensed spectrum, or through license-free spectrum, or through licensed spectrum and license-free spectrum at the same time Communication: Communication can be performed through a frequency spectrum below 6 gigahertz (GHz), or can be performed through a frequency spectrum above 6 GHz, and can also be performed using a frequency spectrum below 6 GHz and a frequency spectrum above 6 GHz at the same time. The embodiments of the present application do not limit the frequency spectrum resources used for wireless communication. The communication system may be a standalone (SA) communication system or a non-standalone (NSA) communication system, and the embodiment of the present application does not limit the networking mode of the communication system.

In the embodiments of the present application, the functions of the network device may also be performed by modules (such as chips) in the network device, or may be performed by a control subsystem including the functions of the network device. Here, the control subsystem including network device functions may be the control center in the above application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The functions of the terminal equipment may also be performed by a module (such as a chip or a modem) in the terminal equipment, or may be performed by a device including the functions of the terminal equipment.

In this application, the network device sends downlink signals or downlink information to the terminal device, and the downlink information is carried on the downlink channel; the terminal device sends uplink signals or uplink information to the network device, and the uplink information is carried on the uplink channel. In order to communicate with the network device, the terminal device needs to establish a wireless connection with the cell controlled by the network device. The cell with which a terminal device has established a wireless connection is called the serving cell of the terminal device. When the terminal equipment communicates with the serving cell, it will also be interfered by signals from neighboring cells.

In order to facilitate the understanding of those skilled in the art, the technical concepts and some terms involved in the embodiments of the present application are explained below.

1), user plane protocol stack, FIG. 2 is a schematic diagram of a new radio (new radio, NR) user plane protocol stack. As shown in Figure 2, the NR user plane protocol stack includes a service data adaptation protocol (service data adaptation protocol, SDAP) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer, an RLC layer, and a media access control layer ( medium access control layer (MAC) layer and physical layer (physical layer, PHY) layer.

Wherein, the RLC layer is located between the PDCP layer and the MAC layer. The RLC layer can communicate with the PDCP layer through a service access point (SAP) or RLC channel, and communicate with the MAC layer through a logical channel. The data transmitted between the RLC layer and the PDCP layer is called an RLC service data unit (service data unit, SDU) or a PDCP protocol data unit (protocol data unit, PDU). The RLC layer can perform operations such as segmentation, concatenation, reassembly, and re-segmentation of RLC SDUs.

An RLC can receive RLC PDU from the lower layer (MAC layer) and submit RLC SDU to the upper layer (PDCP layer or RRC layer), or receive RLC SDU from the upper layer and submit RLC PDU to the lower layer. The RLC PDU may be an RLC data PDU or an RLC control PDU. An RLC receives the RLC SDU from the upper layer through the RLC channel between itself and the upper protocol layer entity, and composes the RLC data PDU; the RLC passes the composed RLC data PDU to the MAC layer through the logical channel between itself and the MAC layer for further processing deal with. Correspondingly, an RLC can receive the RLC data PDU from the MAC layer through the logical channel, and compose the RLC SDU according to the RLC data PDU; the RLC submits the composed RLC SDU to the upper layer entity through the RLC channel for further processing. The RLC will submit the generated RLC PDU to the MAC layer only when the MAC layer indicates a transmission opportunity, and the total size of the submitted one or more RLC PDUs needs to match the packet size indicated by the MAC layer. If it does not match the transmission opportunity size indicated by the MAC layer, an RLC SDU may be divided into multiple segments and composed into multiple RLC PDUs for transmission.

In order to meet the quality of service (QoS) requirements of different types of business data, the RLC layer provides three transmission modes: transparent mode (transparent mode, TM), unacknowledged mode (unacknowledged mode, UM) and acknowledged mode (acknowledge mode , AM).

The TM mode is used to transmit data of signaling radio bearer (SRB) 0, paging data, and broadcast system messages. In TM mode, RLC does not segment and concatenate the RLC SDU of this type of message, but only provides the transparent transmission function of data.

UM mode is usually used for services with high service delay requirements but general reliability requirements. After a data packet is transmitted through RLC, the transmission is considered to be over. Even if the data packet is lost in the air interface transmission, the RLC layer will not retry it. pass.

The AM mode is usually used for services that require high service reliability, and this type of service needs to avoid data transmission loss as much as possible. RLC adopts automatic repeat request (automatic repeat request, ARQ) mechanism to ensure the lossless transmission of data. The basic idea of ARQ is that the data receiver (referred to as the receiver) can send a status report (status report) to the data sender (referred to as the sender), indicating which data packets are received successfully and which data packets fail to be received, and the sender can based on the status Reports the retransmission of packets that failed to transmit.

2), the ARQ mechanism, as shown in Figure 3, is a schematic diagram of the RLC polling (polling) process under the ARQ mechanism provided for the implementation of this application. Under normal circumstances, the sending end RLC will trigger polling according to the rules specified in the protocol, and the receiving end RLC will trigger polling in accordance with the rules specified in the protocol. Reply to the status report after polling.

If the status report cannot be returned to the sender due to reasons such as untimely scheduling or air interface error, the RLC at the sender will continue to trigger polling according to the rules specified in the protocol, and will trigger polling retransmission after the buffer is empty. Each time the device times out, polling retransmission will be performed until the maximum number of polling retransmissions will trigger the RLC maximum retransmission call drop.

3) The existing RLC parameter configuration mechanism. When the RB of the terminal device is established, the network device can configure a set of RRC parameters for the RB. When the RLC parameters of the RB need to be changed, the network device can send the radio resource control (radio resource control, RRC) reconfiguration (RRC_RECONFIG ) message (or signaling) to reconfigure a set of RRC parameters for the RB. The RB may be a signaling radio bearer (signaling radio bearer, SRB), a data radio bearer (data radio bearer, DRB), etc. As shown in Figure 4, when SRB1 is established, the network device can configure a set of RLC parameters for SRB1 of the terminal device through the RRC configuration (RRC_SETUP) message (or signaling). When SRB2/DRB is established, a set of RLC parameters is also configured for SRB2/DRB through an RRC reconfiguration (RRC_RECONFIG) message. When it is necessary to change the RLC parameters of a certain RB (such as SRB1), such as the number of terminal devices connected to the network device and the air interface of the network device, when the RLC parameters of SRB1 need to be changed, the network device can pass the RRC_RECONFIG message. Reconfigure a set of RLC parameters.

However, the RLC parameters usually include parameters such as the timing length of the polling retransmission timer and the timing length of the prohibiting sending status report timer. The overhead is high, especially when a large number of terminal devices in the entire cell need to be reconfigured, and a large number of reconfiguration messages are sent at the same time, which may also affect the normal service data transmission of the terminal devices.

This application aims to provide a communication method that can support flexible adjustment of RLC parameters of RB, so that network equipment can flexibly change the timing of the polling retransmission timer according to the number of connected terminal equipment, air interface conditions, and the number of retransmissions. Time length and other RLC parameters to achieve goals such as reducing call drop rate and saving air interface resources.

Embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In addition, it should be understood that in the embodiments of the present application, the word "exemplary" is used as an example, illustration or explanation. Any embodiment or design described herein as "example" is not to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word example is intended to present concepts in a concrete manner.

The terms "comprising" and "having" in the embodiments of the present application, claims and drawings are not exclusive. For example, a process, method, system, product or device including a series of steps or modules is not limited to the listed steps or modules, and may also include unlisted steps or modules. The terms "system" and "network" are often used interchangeably herein.

Fig. 5 is a schematic diagram of a communication method provided by an embodiment of the present application, the method includes:

S501: The terminal device receives indication information from the network device, the indication information is used to indicate a set of RLC parameters in multiple sets of RLC parameters, and the multiple sets of RLC parameters include the timing length of the polling retransmission timer different.

S502: The terminal device determines the RLC parameters applied by the RB according to the indication information.

As shown in Figure 6, it is a schematic diagram of polling triggering scenarios. Scenario 1: When the number of bytes sent by the sending end RLC reaches the threshold value of the number of bytes that triggers polling, the sending end RLC sends the current data packet (that is, the number of bytes sent by the sending end RLC reaches the number of bytes that triggers polling) Threshold data packet) polling is set and sent to the receiving end RLC, polling is triggered, and the number of bytes sent and the number of PDUs sent are cleared, and the number of bytes sent and the number of PDUs sent is recalculated; Scenario 2: When the number of PDUs sent by the sending end RLC reaches the threshold of the number of PDUs that trigger polling, the sending end RLC will send the current data packet (that is, the data packet that makes the number of PDUs sent by the sending end RLC reach the threshold of the number of PDUs that trigger polling) After polling is set, it is sent to the RLC at the receiving end, polling is triggered, and the number of PDUs sent and the number of bytes sent are cleared, and the number of PDUs sent and byte data sent are recalculated; Scenario 3: The current data packet is for RB For the last data packet empty in the initial transmission/retransmission buffer, the RLC at the sending end will set the polling bit of the current data packet and send it to the RLC at the receiving end to trigger polling; Scenario 4: The polling retransmission timer expires, but the initial transmission of the RB /The retransmission buffer is not all empty, the RLC at the sending end triggers polling according to scenarios 1 to 3; Scenario 5: the polling retransmission timer expires, the initial transmission/retransmission buffer of the RB is empty, and the RLC at the sending end will retry Transmit the data packet with the largest sequence number (sequence number, SN) sent or any data packet that has not been confirmed by the receiving end, and set polling of the data packet to trigger polling.

Among them, the initial transmission cache of RB is used to store the data packets that RB needs to send initially (that is, the first time) to the receiving end RLC, and the retransmission buffer of RB is used to store the data packets that RB needs to resend to the receiving end RLC ( For example, the initial transmission to the receiving end RLC, but the receiving end RLC has not confirmed the successful reception of the data packet), the RB's initial transmission/retransmission buffer is empty means that there is no need to send to the receiving end RLC in the RB's initial transmission/retransmission buffer data pack. The data packet polling setting may refer to adding a polling flag to the data packet. For example: the polling bit (or field) in the data packet can be set to 1, the polling bit in the data packet is 0 by default, polling is not triggered, and polling is triggered when the polling bit in the data packet is 1.

In real business, polling is usually triggered through scenarios 1, 2, 3, and 4, and polling is triggered through scenario 5 only if the RLC at the receiving end fails to reply to the sending end with a status report in time. It can be seen from Figure 6 that polling retransmission occurs after the buffer of the RB is empty (both the initial transmission buffer and the retransmission buffer are empty), and the actual time required for the maximum retransmission caused by the RLC at the sending end not receiving the status report is: Empty required duration + polling retransmission timer timing duration * maximum number of retransmissions. And in the case of triggering polling through scene 5, the data packet transmission between the sending end RLC and the receiving end RLC has been abnormal, and the timing length of the polling retransmission timer at this time (that is, the cycle of the polling retransmission timer) has been extended ), will not affect normal services, will not occupy too many resources, and can simultaneously reduce the maximum retransmission call drop rate of RLC.

As an example, when the number of terminal devices connected to the network device is large, the uplink and/or downlink scheduling period of the network device to the terminal device may be relatively long, and the status report scheduling is not timely. If the polling of the RB on the terminal device side The timing duration of the retransmission timer is set to be short, and the RLC maximum retransmission occurs before the terminal device RLC receives the status report from the network device RLC, which triggers the RLC maximum retransmission call drop, which will affect user experience. Therefore, in the embodiment of the present application, the RLC maximum retransmission call drop caused by untimely status report scheduling can be improved by changing the RLC parameters including the timing duration of the polling retransmission timer.

In addition, in order to reduce the signaling overhead of RLC parameter reconfiguration, in some implementations, when the RB is established, the network device can pre-configure multiple sets of RLC parameters for the RB of the terminal device by sending configuration information to the terminal device, wherein multiple sets of RLC The timing duration of the polling retransmission timer included in the parameter is different, so as to directly instruct the terminal device to switch the RLC parameters of the RB application between multiple sets of RLC parameters when the RLC parameters of the RB application need to be changed.

It should be understood that, in this embodiment of the application, RBs may be radio bearers such as SRBs and DRBs, and terminal devices may establish one or more RBs with network devices, for example, terminal devices may establish one or more SRBs with network devices, or One or more DRBs can be established with the network device, and one or more SRBs and one or more DRBs can also be established with the network device. In addition to the timing duration of the polling retransmission timer, the RLC parameters can also include the threshold value of the number of bytes that trigger polling, the threshold value of the number of PDUs that trigger polling, the timing duration of the prohibition of sending status report timer, and RLC reassembly One or more of the timing duration of the timer, etc.

As an example, as shown in Figure 7, when a terminal device establishes SRB1, the network device may send configuration information to the terminal device through an RRC configuration (RRC_SETUP) message, etc., and the configuration information may be used to configure multiple sets of RLC parameters for SRB1 . For example: configure RLC parameter 1 for SRB1 of the terminal device through the configuration information, including: polling retransmission timer timing length 1, trigger polling byte number threshold 1, trigger polling PDU number threshold 1, and send prohibition status Timing duration 1 of the report timer, timing duration 1 of the RLC reassembly timer; RLC parameter 2 includes: timing duration 2 of the polling retransmission timer, threshold number of bytes triggering polling 2, threshold number of PDUs triggering polling Value 2, the timing duration of the prohibition of sending status report timer 2, the timing duration of the RLC reassembly timer 2; RLC parameter 3 includes: the timing duration of the polling retransmission timer 3, the threshold value of the number of bytes triggering polling 3, the trigger The polling PDU number threshold value is 3, the timing duration of the prohibition of sending status report timer is 3, and the timing duration of the RLC reassembly timer is 3. The timing duration 1 of the polling retransmission timer in RLC parameter 1, the timing duration 2 of the polling retransmission timer and the timing duration 3 of the polling retransmission timer in RLC parameter 1, RLC parameter 2, and RLC parameter 3 are different.

After receiving the configuration information, the terminal device can select one set of RLC parameters from multiple sets of RLC parameters configured for SRB1 as the RLC parameters for the initial application of SRB1. For example, the terminal device may randomly select a set of RLC parameters among multiple sets of RLC parameters as the RLC parameters for the initial application of SRB1; it may also select a set of default RLC parameters among multiple sets of RLC parameters as the RLC parameters for the initial application of SRB1. As an example: the first set of RLC parameters in multiple sets of RLC parameters can be pre-configured as the default RLC parameters through network device configuration, protocol configuration, etc. The first set of RLC parameters "such as RLC parameter 1 in RLC parameter 1, RLC parameter 2 and RLC parameter 3" is used as the RLC parameter for the initial application of SRB1.

In addition, if the terminal device also establishes other RBs such as SRB2/DRB1 on the basis of SRB1, the network device can also send configuration information to the terminal device through an RRC reconfiguration (RRC_RECONFIG) message, etc., and the configuration information can be used for SRB2/DRB1. DRB1 and other RBs are configured with multiple sets of RLC parameters. For example: configure RLC parameter 4, RLC parameter 5 and RLC parameter 6 for SRB2/DRB1 of the terminal device through the configuration information. After receiving the configuration information, the terminal device can select one set of RLC parameters among multiple sets of RLC parameters configured for SRB2/DRB1 as the RLC parameters for the initial application of SRB2/DRB1.

When the amount of data transmitted by the RB corresponding to the terminal device within the first duration is greater than or equal to the first threshold, or the number of terminal devices connected to the network device is greater than or equal to the second threshold, or the performance of the air interface changes, etc. , when the network device needs to change the RLC parameters applied by a certain RB, the network device can instruct the terminal device that the RB applies a certain Set RLC parameters to achieve RLC reconfiguration, such as reconfiguring RLC parameters to appropriately shorten the timing of the polling retransmission timer and/or the timing of the prohibition of sending status report timers to reduce call drops and prevent the RLC retransmission mechanism called peak Transmission bottlenecks, etc.

The indication information may include identification information of the RLC parameter, an index number associated with the RLC parameter, and other information that may indicate the RLC parameter, and may also include identification information of a corresponding RB, and the like. The specific indication information can be carried in the media access control layer control element (media access control control element, MAC CE), downlink control information (downlink control information, DCI) signaling, etc., through the MAC CE, DCI signaling, etc. by the network The device sends to the end device.

As an example, still referring to FIG. 7, if the network device configures multiple sets of RLC parameters for SRB1 of the terminal device, the timing length 1 of the polling retransmission timer included in RLC parameter 1 is 10 ms, and the timing length 1 of the polling retransmission timer included in RLC parameter 2 is 10 ms. The timing duration 2 of the polling retransmission timer is 20ms, the timing duration 3 of the polling retransmission timer included in the RLC parameter 3 is 30ms, and the RLC parameter currently applied by the SRB1 on the terminal device side is the RLC parameter 1. When the number of connected terminal devices is greater than or equal to the first threshold value (such as 300), the network device may send to the terminal device an instruction message carrying an indication that SRB1 applies RLC parameter 2 in order to reduce the call drop rate, indicating that the terminal device's SRB1 applies RLC parameter 2, thereby prolonging the actual required time for maximum retransmission of SRB1 caused by the fact that the terminal equipment RLC cannot receive the status report replied by the network equipment RLC, and reducing the maximum retransmission call drop rate of RLC.

Another example: if the current time is 10:00:10 and the first duration is 10s, the amount of data transmitted by the network device in SRB1 corresponding to the terminal device within the first duration (10:00:00-10:00:10) is greater than Or when it is equal to the first threshold value, in order to reduce the call drop rate, it is also possible to send an indication message carrying an indication that SRB1 applies RLC parameter 2 to the terminal equipment, and instructs the SRB1 of the terminal equipment to apply RLC parameter 2, thereby prolonging the period that the terminal equipment RLC cannot receive The actual time required for the maximum retransmission of SRB1 caused by the status report replied by the network device RLC reduces the maximum retransmission call drop rate of the RLC.

The above is an example of configuring multiple sets of RLC parameters for each RB. In practical applications, multiple sets of RLC parameters configured for multiple RBs of the same type are usually the same or similar. Therefore, in some implementations, the same type of RLC parameters Multiple RBs may also share multiple sets of RLC parameters. For example, a terminal device establishes SRB1 and SRB2 in sequence, and the network device may configure multiple sets of RLC parameters for SRB1 of the terminal device, but the multiple sets of RLC parameters are not only applicable to SRB1, but also applicable to SRB2. Another example is that the terminal device establishes DRB1, DRB2, and DRB3 in sequence, and the network device can configure multiple sets of RLC parameters for DRB1 of the terminal device, but the multiple sets of RLC parameters are not only applicable to DRB1, but also applicable to DRB2 and DRB3.

As an example, as shown in Figure 8, when a terminal device establishes SRB1, the network device may send configuration information to the terminal device through an RRC configuration (RRC_SETUP) message, etc., and the configuration information may be used to configure multiple sets of RLC parameters for SRB1 . For example: configure RLC parameter 1, RLC parameter 2, and RLC parameter 3 for SRB1 of the terminal device through the configuration information. After receiving the configuration information, the terminal device can select a set of RLC parameters among multiple sets of RLC parameters configured for SRB1 as the RLC parameters for the initial application of SRB1, for example, select RLC parameter 1 as the default RLC parameters for the initial application of SRB1.

If the terminal device continues to establish SRB2 on the basis of SRB1, the network device can no longer configure multiple sets of RLC parameters for SRB2, and configure SRB2 to reuse multiple sets of RLC parameters of SRB1. A set of RLC parameters is selected from the RLC parameters (RLC parameter 1, RLC parameter 2 and RLC parameter 3) as the RLC parameters for the initial application of the SRB2. Of course, the network device may also issue indication information indicating that a certain set of RLC parameters among the multiple sets of RLC parameters is the RLC parameter applied by the SRB2, so as to specifically instruct the SRB2 of the terminal equipment to apply a certain set of RLC parameters.

When the network device needs to change the RLC parameters applied by a certain RB (take SRB1 as an example), the network device can send a message to the terminal device to instruct SRB1 to apply a set of RLC parameters (such as RLC parameter 2) among multiple sets of RLC parameters. The indication information indicates that the SRB1 of the terminal equipment applies a certain set of RLC parameters among multiple sets of RLC parameters to realize RLC reconfiguration.

What needs to be understood is that for the case where the RB is a DRB, the amount of data packets carried and transmitted by the DRB is usually large, and the data packets of the DRB are continuously stored in the DRB cache. Long, the probability of DRB buffer emptying is low, and the probability of RLC maximum retransmission call drop is low. For the case where the RB is an SRB, since the number of data packets corresponding to the SRB is usually small, the duration of the SRB cache emptying is usually short, the probability of the SRB cache emptying is high, and the probability of the RLC maximum retransmission call drop is relatively low. Therefore, the communication scheme provided by this application is especially suitable for improving the call drop caused by the RLC maximum retransmission caused by the untimely scheduling of the SRB status report. Of course, it can also be applied to improve the call drop caused by the RLC maximum retransmission caused by the untimely scheduling of the status report of the DRB.

It can be understood that, in order to implement the functions in the foregoing embodiments, the network device and the terminal device include hardware structures and/or software modules corresponding to each function. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and method steps of the examples described in the embodiments disclosed in the present application. Whether a certain function is executed by hardware or computer software drives the hardware depends on the specific application scenario and design constraints of the technical solution.

FIG. 9 and FIG. 10 are schematic structural diagrams of possible communication devices provided by the embodiments of the present application. These communication apparatuses may be used to realize the functions of the terminal device or the network device in the foregoing method embodiments, and thus also realize the beneficial effects of the foregoing method embodiments. In this embodiment of the application, the communication device may be one of the terminal devices 120a-120j as shown in FIG. 1, or it may be the network device 110a or 110b as shown in FIG. 1, or it may be a terminal device Or a module (such as a chip) of a network device.

As shown in FIG. 9 , a communication device 900 includes a processing unit 910 and an interface unit 920 . The communication device 900 is configured to realize the functions of the terminal device or the network device in the method embodiment shown in FIG. 5 above.

When the communication device 900 is used to realize the functions of the terminal equipment in the method embodiment shown in FIG. 5: the interface unit 920 is used to receive indication information from the network equipment, and the indication information is used to indicate multiple sets of wireless links A set of RLC parameters in the RLC parameters of the control protocol, and the timing lengths of the polling retransmission timers included in the multiple sets of RLC parameters are different;

The processing unit 910 is configured to determine the RLC parameters of the radio bearer RB application according to the indication information.

In a possible design, the interface unit 920 may also receive configuration information from the network device, where the configuration information is used to configure the multiple sets of RLC parameters.

In a possible design, the processing unit 910 may also use one set of RLC parameters in the multiple sets of RLC parameters as the RLC parameters initially applied by the RB.

When the communication device 900 is used to implement the function of the network device in the method embodiment shown in FIG. 5: the processing unit 910 is configured to generate indication information, and the indication information is used to indicate multiple sets of radio link control protocol RLC parameters A set of RLC parameters in the set of RLC parameters, the timing length of the polling retransmission timer included in the multiple sets of RLC parameters is different;

The interface unit 920 is configured to send the indication information to the terminal device.

In a possible design, the interface unit 920 may also send configuration information to the terminal device, where the configuration information is used to configure the multiple sets of RLC parameters.

In a possible design, before the processing unit 910 generates the indication information, it may confirm that at least one of the following conditions is satisfied:

The amount of data transmitted by the radio bearer RB corresponding to the terminal device within the first duration is greater than or equal to the first threshold;

The number of connected terminal devices is greater than or equal to the second threshold.

The above RLC parameters also include one or more of the following:

The threshold value of the number of bytes to trigger polling, the threshold value of the number of protocol data units (PDUs) to trigger polling, the timing duration of the prohibition of sending status report timer, and the timing duration of the RLC reassembly timer.

The RB mentioned above may be a signaling radio bearer (SRB) or a data radio bearer (DRB).

The above indication information can be transmitted by the media access control layer control unit MAC CE.

As shown in FIG. 10 , a communication device 1000 includes a processor 1010 and an interface circuit 1020 . The processor 1010 and the interface circuit 1020 are coupled to each other. It can be understood that the interface circuit 1020 may be a transceiver or an input-output interface. Optionally, the communication device 1000 may further include a memory 1030 for storing instructions executed by the processor 1010 or storing input data required by the processor 1010 to execute the instructions or storing data generated by the processor 1010 after executing the instructions.

When the communication device 1000 is used to implement the method shown in FIG. 5 , the processor 1010 is used to implement the functions of the above processing unit 910 , and the interface circuit 1020 is used to implement the functions of the above interface unit 920 .

When the above-mentioned communication device is a chip applied to a terminal device, the chip of the terminal device implements the functions of the terminal device in the above-mentioned method embodiment. The chip of the terminal device receives information from other modules in the terminal device (such as radio frequency modules or antennas), which is sent by the network device to the terminal device; or, the chip of the terminal device sends information to other modules in the terminal device (such as radio frequency modules) module or antenna) to send information, which is sent by the terminal device to the network device.

When the above-mentioned communication device is a module applied to a network device, the module of the network device implements the functions of the network device in the above-mentioned method embodiment. The module of the network device receives information from other modules in the network device (such as radio frequency module or antenna), and the information is sent to the network device by the terminal device; or, the module of the network device sends information to other modules in the network device (such as radio frequency module or antenna) to send information, which is sent by the network device to the terminal device. The module of the network device here can be a baseband chip in the network device, or it can be a DU or other modules, and the DU here can be a DU under the architecture of an open radio access network (O-RAN).

It can be understood that the processor in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only Memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC can be located in a network device or a terminal device. Certainly, the processor and the storage medium may also exist in the network device or the terminal device as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; and it may also be a semiconductor medium, such as a solid state disk. The computer readable storage medium may be a volatile or a nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

In addition, it needs to be understood that in this embodiment of the application, information (information), signal (signal), message (message), and channel (channel) can sometimes be mixed. The meaning is the same. "的(of)", "corresponding (corresponding, relevant)" and "corresponding (corresponding)" can sometimes be used interchangeably. It should be pointed out that when the difference is not emphasized, the meanings they intend to express are consistent.

In this application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. In the text description of this application, the character "/" generally indicates that the contextual objects are an "or" relationship; in the formulas of this application, the character "/" indicates that the contextual objects are a "division" Relationship. "Including at least one of A, B and C" may mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic.

Claims (28)

A communication method, characterized in that, comprising: receiving indication information from the network device, where the indication information is used to indicate a set of RLC parameters among multiple sets of radio link control protocol RLC parameters, and the timing lengths of the polling retransmission timers included in the multiple sets of RLC parameters are different; According to the indication information, determine the RLC parameters applied by the radio bearer RB. The method of claim 1, further comprising: Receive configuration information from the network device, where the configuration information is used to configure the multiple sets of RLC parameters. The method of claim 2, further comprising: Using one set of RLC parameters in the multiple sets of RLC parameters as the RLC parameters initially applied by the RB. The method according to any one of claims 1-3, wherein the RLC parameters further include one or more of the following: The threshold value of the number of bytes to trigger polling, the threshold value of the number of protocol data units (PDUs) to trigger polling, the timing duration of the prohibition of sending status report timer, and the timing duration of the RLC reassembly timer. The method according to any one of claims 1-4, wherein the RB is a Signaling Radio Bearer (SRB) or a Data Radio Bearer (DRB). The method according to any one of claims 1-5, wherein the indication information is transmitted by a media access control layer control unit MAC CE. A communication method, characterized in that, comprising: generating indication information, where the indication information is used to indicate a set of RLC parameters among multiple sets of radio link control protocol RLC parameters, and the timing lengths of the polling retransmission timers included in the multiple sets of RLC parameters are different; Send the indication information to the terminal device. The method of claim 7, further comprising: Send configuration information to the terminal device, where the configuration information is used to configure the multiple sets of RLC parameters. The method according to claim 7 or 8, further comprising confirming that at least one of the following conditions is satisfied before generating the indication information: The amount of data transmitted by the radio bearer RB corresponding to the terminal device within the first duration is greater than or equal to the first threshold; The number of connected terminal devices is greater than or equal to the second threshold. The method according to any one of claims 7-9, wherein the RLC parameters also include one or more of the following: The threshold value of the number of bytes to trigger polling, the threshold value of the number of protocol data units (PDUs) to trigger polling, the timing duration of the prohibition of sending status report timer, and the timing duration of the RLC reassembly timer. The method according to claim 9, wherein the RB is a signaling radio bearer (SRB) or a data radio bearer (DRB). The method according to any one of claims 7-11, wherein the indication information is transmitted by a media access control layer control unit MAC CE. A communication device, characterized by comprising an interface unit and a processing unit; The interface unit is configured to receive indication information from a network device, the indication information is used to indicate a set of RLC parameters among multiple sets of radio link control protocol RLC parameters, and the polling retransmission included in the multiple sets of RLC parameters The timing duration of the timer is different; The processing unit is configured to determine the RLC parameters of the radio bearer RB application according to the indication information. The apparatus according to claim 13, wherein the interface unit is further configured to receive configuration information from the network device, and the configuration information is used to configure the multiple sets of RLC parameters. The device according to claim 14, wherein the processing unit is further configured to use one set of RLC parameters in the plurality of sets of RLC parameters as the RLC parameters initially applied by the RB. The device according to any one of claims 13-15, wherein the RLC parameters further include one or more of the following: The threshold value of the number of bytes to trigger polling, the threshold value of the number of protocol data units (PDUs) to trigger polling, the timing duration of the prohibition of sending status report timer, and the timing duration of the RLC reassembly timer. The apparatus according to any one of claims 13-16, wherein the RB is a Signaling Radio Bearer (SRB) or a Data Radio Bearer (DRB). The device according to any one of claims 13-17, wherein the indication information is transmitted by a media access control layer control unit MAC CE. A communication device, characterized by comprising an interface unit and a processing unit; The processing unit is configured to generate indication information, the indication information is used to indicate a set of RLC parameters in multiple sets of radio link control protocol RLC parameters, and the timing of the polling retransmission timer included in the multiple sets of RLC parameters different duration; The interface unit is configured to send the indication information to the terminal device. The apparatus according to claim 19, wherein the interface unit is further configured to send configuration information to the terminal device, and the configuration information is used to configure the multiple sets of RLC parameters. The device according to claim 19 or 20, wherein, before the processing unit generates the indication information, it includes confirming that at least one of the following conditions is satisfied: The amount of data transmitted by the radio bearer RB corresponding to the terminal device within the first duration is greater than or equal to the first threshold; The number of connected terminal devices is greater than or equal to the second threshold. The device according to any one of claims 19-21, wherein the RLC parameters further include one or more of the following: The threshold value of the number of bytes to trigger polling, the threshold value of the number of protocol data units (PDUs) to trigger polling, the timing duration of the prohibition of sending status report timer, and the timing duration of the RLC reassembly timer. The apparatus according to claim 21, wherein the RB is a signaling radio bearer (SRB) or a data radio bearer (DRB). The device according to any one of claims 19-23, wherein the indication information is transmitted by a media access control layer control unit MAC CE. A communications device, characterized by comprising a processor configured to execute instructions stored in a memory, so that the method according to any one of claims 1-6 is implemented. A communications device, characterized by comprising a processor configured to execute instructions stored in a memory, so that the method according to any one of claims 7-12 is implemented. A computer program product, characterized by comprising program code, when the program code is executed, the method according to any one of claims 1-6 or 7-12 is realized. A computer-readable storage medium, characterized in that computer programs or instructions are stored in the storage medium, and when the computer programs or instructions are executed, such that any one of claims 1-6 or 7-12 The method described is implemented.

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