WO2022134958A1

WO2022134958A1 - Data transmission method and apparatus, and device and storage medium

Info

Publication number: WO2022134958A1
Application number: PCT/CN2021/131313
Authority: WO
Inventors: 夏少华; 石峰
Original assignee: 展讯通信（上海）有限公司
Priority date: 2020-12-22
Filing date: 2021-11-17
Publication date: 2022-06-30
Also published as: CN112702765A; CN112702765B

Abstract

A data transmission method and apparatus, and a device and a storage medium. The method comprises: receiving a reconfiguration message; if the reconfiguration message comprises non-increment configuration indication information, buffering a data packet that is buffered in a data radio bearer (DRB) resource, and releasing the DRB resource; and after the DRB is re-established, transmitting the buffered data packet. By means of the method, packet loss does not occur at a radio protocol stack level, that is, a radio protocol stack realizes lossless data transmission, and compared with data packet retransmission performed by means of an upper layer or an application layer, the time delay is relatively small.

Description

Data transmission method, apparatus, device and storage medium

This application claims the priority of the Chinese patent application with the application number 202011527194.2 and the application title "Data Transmission Method, Apparatus, Equipment and Storage Medium" filed with the China Patent Office on December 22, 2020, the entire contents of which are incorporated by reference in in this application.

technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a data transmission method, apparatus, device, and storage medium.

Background technique

With the development of communication technology, a New Radio (New Radio, NR) system is more and more widely used. In the NR system, the non-incremental configuration full Config indication is often carried in the configuration message for performing cell handover or in the first reconfiguration message after Radio Resource Control (RRC) connection re-establishment. After receiving the full Config instruction, the terminal device needs to release all currently configured data radio bearer (Data Radio Bearer, DRB) resources, and then re-establish the DRB according to the reconfiguration message.

In the related art, when releasing DRB resources, the Packet Data Convergence Protocol (PDCP) module will release all buffered data packets, and the buffered data packets include: those received from the upper layer but not yet submitted to the lower layer for transmission. Service Data Units (SDUs), and SDUs that have been submitted to the lower layer for transmission but have not yet received an acknowledgment of successful transmission from the lower layer. These discarded data packets can only be retransmitted by the upper-layer Transmission Control Protocol (TCP)/IP or application layer. The upper-layer TCP/IP or application layer retransmission interval is generally in seconds, and the delay is relatively large. Delay-sensitive applications will have a greater impact.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a data transmission method, apparatus, device, and storage medium, so as to reduce the delay of data packet transmission.

In a first aspect, an embodiment of the present application provides a data transmission method, including:

receive a reconfiguration message;

If the reconfiguration message includes non-incremental configuration indication information, buffer the data packets buffered on the data radio bearer DRB resources, and release the DRB resources;

After rebuilding the DRB, the buffered data packets are transmitted.

In a possible implementation manner, the receiving the reconfiguration message includes:

The reconfiguration message is received through the radio resource control RRC layer.

In a possible implementation manner, buffering the data packets buffered on the data radio bearer DRB resources and releasing the DRB resources includes:

The RRC layer sends first indication information to the PDCP layer of the Packet Data Convergence Protocol, where the first indication information is used to instruct the PDCP layer to buffer the data packets buffered on the DRB resources and release the DRB resources ;

The data packets buffered on the DRB resource are buffered by the PDCP layer according to the first indication information, and the DRB resource is released.

In a possible implementation manner, the buffering of the data packets buffered on the DRB resource includes:

establishing an association relationship between the data packet buffered on the DRB resource and the EPG bearer ID or the protocol data unit PDU session ID;

According to the association relationship between the data packet and the EPG bearer ID or the PDU session ID, the data packet buffered on the DRB resource is buffered.

In a possible implementation manner, the data packet buffered by the transmission includes:

Acquire the cached data packet according to the association relationship between the data packet and the EPG bearer ID or PDU session ID;

The buffered data packets are transmitted.

In a possible implementation, the method further includes:

Send a notification message to the RRC layer through the PDCP layer, where the notification message is used to indicate that the DRB resource has been released;

Sending, by the RRC layer, second indication information to the PDCP layer according to the reconfiguration message, where the second indication information is used to instruct the PDCP layer to rebuild the DRB;

The DRB is reconstructed by the PDCP layer according to the second indication information.

In a possible implementation manner, the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection re-establishment.

In a second aspect, an embodiment of the present application provides a data transmission device, including:

a receiving module for receiving the reconfiguration message;

a processing module, configured to buffer the data packets buffered on the data radio bearer DRB resources if the reconfiguration message includes non-incremental configuration indication information, and release the DRB resources;

and a sending module, configured to transmit the buffered data packets after rebuilding the DRB.

In a possible implementation manner, the receiving module is specifically used for:

In a possible implementation manner, the processing module is specifically used for:

establishing an association relationship between the data packet cached on the DRB resource and the Evolved Packet System EPS bearer ID or the protocol data unit PDU session ID;

According to the association relationship between the data packet and the Evolved Packet System EPS bearer ID or PDU session ID, the data packet buffered on the DRB resource is buffered.

In a possible implementation manner, the generating module is specifically used for:

Acquire the cached data packet according to the association relationship between the data packet and the Evolved Packet System EPS bearer ID or PDU session ID;

The buffered data packets are transmitted.

In a possible implementation manner, the processing module is further used for:

In a third aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements any one of the methods described in the first aspect.

In a fourth aspect, an embodiment of the present application provides an electronic device, including:

processor; and

a memory for storing executable instructions for the processor;

Wherein, the processor is configured to perform the method of any one of the first aspect by executing the executable instructions.

In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, which implements the method according to any one of the first aspects when the computer program is executed by a processor.

The data transmission method, device, device, and storage medium provided by the embodiments of the present application receive a reconfiguration message; if the reconfiguration message includes non-incremental configuration indication information, the data packets buffered on the data radio bearer DRB resource are buffered, and Release the DRB resources; after rebuilding the DRB, the buffered data packets are transmitted, so that no packet loss occurs at the wireless protocol stack level when the DRB resources are released, that is, the wireless protocol stack can achieve lossless data transmission; The layer retransmits the data packet, and the delay is small.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

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

2 is a schematic flowchart of an embodiment of a data transmission method provided by the present application;

3 is a schematic diagram of an interaction flow of an embodiment of a data transmission method provided by the present application;

4 is a schematic diagram of an interaction flow of another embodiment of the data transmission method provided by the present application;

5 is a schematic structural diagram of an embodiment of a data transmission device provided by the present application;

FIG. 6 is a schematic structural diagram of an embodiment of an electronic device provided by the present application.

The above-mentioned drawings have shown clear embodiments of the present disclosure, and will be described in more detail hereinafter. The drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the disclosed concepts to those skilled in the art by referring to specific embodiments.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as recited in the appended claims.

The terms "comprising" and "having", and any variations thereof, in the description and claims of this application and said drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

First, some vocabulary and application scenarios involved in this application are introduced:

The non-incremental configuration full Config refers to the non-incremental configuration method, that is, the network device side does not perform incremental configuration based on the current configuration, but directly provides a full set of configurations.

The terminal device in this embodiment of the present application may refer to various forms of user equipment (user equipment, UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station (mobile station, MS), remote station, and remote terminal , mobile device, user terminal, terminal equipment, wireless communication device, user agent or user equipment. The terminal device may also 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 wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or future evolved Public Land Mobile Networks (PLMN) A terminal device, etc., is not limited in this embodiment of the present application.

In addition, the network equipment involved in this application may be a base station (Base Transceiver Station, BTS) in Global System of Mobile communication (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or The base station (NodeB, NB) in Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) may also be a long-term evolution (Long Term Evolution, LTE) or an enhanced long-term evolution (evolved Long Term Evolution, eLTE). An evolved base station (evolved NodeB, eNB), or a next generation-evolved NodeB (ng-eNB), or an access point (Access Point, AP) or a relay station in a WLAN, or a The gNB in 5G NR can also be an access device in the future communication network, etc., which is not limited here.

FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application. The technical solution provided by the present application is based on the network architecture shown in FIG. 1 . The network architecture includes at least one terminal device 100 that communicates with the network device 200 through a wireless interface. For the sake of clarity, only one terminal device and one network device are shown in FIG. 1 .

In the NR system, the non-incremental configuration full Config indication is often carried in the configuration message for performing cell handover or in the first reconfiguration message after Radio Resource Control (RRC) connection re-establishment. After receiving the full Config instruction, the terminal device needs to release all currently configured data radio bearer (Data Radio Bearer, DRB) resources, and then re-establish the DRB according to the reconfiguration message.

Application layer retransmission generally needs to wait until the network device side sends a retransmission instruction or does not receive feedback from the network device side within a preset period of time before retransmission. The delay is large and the user experience is seriously affected.

In the method of the embodiment of the present application, if the reconfiguration message includes non-incremental configuration indication information, the data packets buffered on the data radio bearer DRB resources are buffered, and the DRB resources are released; after the DRB is rebuilt, the buffered data packets are transmitted, Therefore, there will be no packet loss at the wireless protocol stack level when releasing DRB resources, that is, the wireless protocol stack can realize lossless data transmission; Latency is on the order of seconds, so it is small compared to retransmitting packets through upper or application layers.

The technical solutions of the present application will be described in detail below with specific examples. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

FIG. 2 is a schematic flowchart of an embodiment of a data transmission method provided by the present application. As shown in FIG. 2 and FIG. 3 , the method provided by this embodiment includes:

Step 101: Receive a reconfiguration message.

Specifically, the terminal device receives the reconfiguration message sent by the network device side.

In one embodiment, the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection re-establishment.

Step 102: If the reconfiguration message includes non-incremental configuration indication information, buffer the data packets buffered on the DRB resources of the data radio bearer, and release the DRB resources.

Specifically, for this scenario of DRB resource release caused by full Config, in the related art, DRB resources are released, and the data packets cached on the DRB resources are discarded, while in the embodiment of the present application, the data cached on the DRB resources is discarded. Packets are cached and DRB resources are released.

The buffered data packets include: SDUs received from the upper layer but not yet submitted to the lower layer for transmission, and SDUs that have been submitted to the lower layer for transmission but have not yet received confirmation of successful transmission from the lower layer.

Step 103: After rebuilding the DRB, transmit the buffered data packets.

Specifically, after the DRB is re-established, the buffered data packets are preferentially retransmitted, so that no packet loss occurs at the wireless protocol stack level when the DRB resources are released, that is, the wireless protocol stack achieves lossless data transmission. Since DRB resources are released and rebuilt according to the signaling of the same reconfiguration message, the delay of transmitting the saved data packets after reconstruction is generally in the millisecond level. Compared with retransmitting data packets through the upper layer or the application layer, the delay is relatively low Small.

In the method of this embodiment, a reconfiguration message is received; if the reconfiguration message includes non-incremental configuration indication information, the data packets buffered on the DRB resource of the data radio bearer are buffered, and the DRB resource is released; after the DRB is rebuilt, the buffer is transmitted. Therefore, there will be no packet loss at the wireless protocol stack level when releasing DRB resources, that is, the wireless protocol stack can achieve lossless data transmission; and compared with retransmitting data packets through the upper layer or the application layer, the delay is smaller.

On the basis of the foregoing embodiment, step 101 can be implemented in the following manner:

Specifically, the radio resource control RRC layer receives the reconfiguration message, and if the reconfiguration message carries the non-incremental configuration full Config indication information, it instructs the PDCP layer to keep the data packets buffered on the DRB resources when notifying the PDCP layer to release the DRB resources.

In one embodiment, as shown in FIG. 4 , step 102 may be implemented in the following manner:

Send first indication information to the packet data convergence protocol PDCP layer through the RRC layer, where the first indication information is used to instruct the PDCP layer to buffer the data packets buffered on the DRB resources and release the DRB resources;

Specifically, the RRC layer receives the reconfiguration message. If the reconfiguration message carries the non-incremental configuration full Config indication information, the RRC layer sends the first indication information to the PDCP layer through the RRC layer, which is used to instruct the PDCP layer to release the DRB resources. When the data packets cached on the DRB resource are cached. The buffered data includes: SDUs received by the PDCP from the upper layer but not submitted to the lower layer for transmission, and SDUs that have been submitted to the lower layer for transmission but have not yet received confirmation of successful transmission from the lower layer.

The PDCP layer buffers the data packets buffered on the DRB resource, and releases the DRB resource.

In the above embodiment, the RRC layer sends the first indication information to the PDCP layer to instruct the PDCP layer to buffer the data packets buffered on the DRB resources when releasing the DRB resources, and the implementation process is simple.

In one embodiment, the step "cache the data packets cached on the DRB resource" may be implemented in the following manner:

Establish an association relationship between the data packet cached on the DRB resource and the Evolved Packet System (Evolved Packet System, EPS) bearer ID, or the Protocol Data Unit (Protocol Data Unit, PDU) session ID;

Specifically, if the current network is a non-standalone (Non-Standalone, NSA) networking network, that is, an LTE system, the PDCP layer establishes an association relationship between the data packet and the EPS bearer ID; if the current network is an independent (Standalone, SA) group Network network, namely the 5G system, the PDCP layer establishes the association between the data packet and the PDU session ID.

The EPS bearer is the bearer from the terminal device to the core network. The 5G network establishes a path between a terminal device and an external network, called a PDU session (Session).

According to the first indication information of the RRC layer, PDCP first saves the data packet buffered on the DRB resource, and establishes an association relationship between the saved data packet and the EPS bearer ID associated with the DRB resource, or the PDU session associated with the DRB resource. ID establishes an association relationship. The DRB resources are then released.

In one embodiment, step 103 may be implemented in the following manner:

Transmit buffered packets.

Specifically, after the DRB is rebuilt, the associated data packet is found according to the EPS bearer ID or PDU session ID associated with the rebuilt DRB and the association relationship, and the buffered data packet is transmitted.

In the above-mentioned embodiment, when the data packet is cached, an association relationship between the data packet cached on the DRB resource and the EPS bearer ID, or the PDU session ID is established. After the DRB is rebuilt, the saved data can be found quickly according to the association relationship. Packet, so as to transmit, the efficiency is high, and the delay is small.

In one embodiment, the method further includes:

Specifically, the PDCP layer notifies the RRC layer that the release of the DRB resources has been completed after the release of the DRB resources is completed. For example, a notification message is sent, and the notification message is used to indicate that the release of the DRB resources has been completed.

After receiving the notification message that the release of the PDCP layer is completed, the RRC layer then notifies the PDCP layer to re-establish the DRB according to the reconfiguration message, that is, sends second indication information to the PDCP layer, where the second indication information is used to instruct the PDCP layer to rebuild the DRB .

The PDCP layer re-establishes the DRB according to the second indication information, and then finds the saved data packets according to the EPS bearer ID or PDU session ID associated with the DRB and the association relationship, and transmits these data packets preferentially. After the transmission of these data packets is completed, the newly received data packets from the upper layer are sent.

In one embodiment, the data transmission method includes the following steps:

Step 1. Receive the reconfiguration message through the radio resource control RRC layer;

Step 2. If the reconfiguration message includes non-incremental configuration indication information, send first indication information to the Packet Data Convergence Protocol PDCP layer through the RRC layer, where the first indication information is used to instruct the PDCP layer to The data packets buffered on the DRB resource are buffered, and the DRB resource is released;

Step 3, establishing an association relationship between the data packet buffered on the DRB resource and the EPG bearer ID or the protocol data unit PDU session ID by the PDCP layer according to the first indication information;

Step 4, cache the data packets buffered on the DRB resources according to the association relationship between the data packets and the EPG bearer ID or PDU session ID;

Step 5, releasing the DRB resource;

Step 6. Send a notification message to the RRC layer through the PDCP layer, where the notification message is used to indicate that the DRB resource has been released;

Step 7: Send second indication information to the PDCP layer through the RRC layer according to the reconfiguration message, where the second indication information is used to instruct the PDCP layer to rebuild the DRB;

Step 8. Rebuild the DRB through the PDCP layer according to the second indication information;

Step 9, according to the association relationship between the data packet and the evolved packet system bearer ID or PDU session ID, obtain the cached data packet;

Step 10. Transmit the buffered data packets

In the method of this embodiment, if the reconfiguration message includes non-incremental configuration indication information, the data packets buffered on the DRB resources of the data radio bearer are buffered through the PDCP layer, and the DRB resources are released; after the DRB is rebuilt, the data packets are transmitted through the PDCP layer. Cached data packets, so that no packet loss occurs at the wireless protocol stack level when DRB resources are released, that is, the wireless protocol stack can achieve lossless data transmission; The delay of retransmitting data packets is in seconds, so it is smaller than retransmitting data packets through the upper layer or the application layer.

FIG. 5 is a schematic structural diagram of an embodiment of a data transmission apparatus provided by the present application. As shown in FIG. 5 , the data transmission apparatus of this embodiment includes:

a receiving module 110, configured to receive a reconfiguration message;

A processing module 111, configured to buffer the data packets buffered on the data radio bearer DRB resources and release the DRB resources if the reconfiguration message includes non-incremental configuration indication information;

The sending module 112 is configured to transmit the buffered data packet after rebuilding the DRB.

In a possible implementation manner, the receiving module 110 is specifically configured to:

In a possible implementation manner, the processing module 111 is specifically used for:

In a possible implementation manner, the generating module 112 is specifically configured to:

The buffered data packets are transmitted.

In a possible implementation manner, the processing module 111 is further configured to:

The apparatus of this embodiment can be used to implement the technical solutions of the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

The data transmission device shown in the embodiments of the present application may be a chip, a hardware module, a processor, or the like. Of course, the data transmission device may be in other forms, which are not specifically limited in this embodiment of the present application.

FIG. 6 is a schematic structural diagram of an embodiment of an electronic device provided by the application. As shown in FIG. 6 , the electronic device includes:

The processor 210 , and a memory 211 for storing executable instructions for the processor 210 .

Optionally, it may further include: a communication interface 212 for implementing communication with other devices.

The above components may communicate via one or more buses.

The processor 210 is configured to execute the corresponding method in the foregoing method embodiment by executing the executable instruction. For the specific implementation process, reference may be made to the foregoing method embodiment, which will not be repeated here.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the corresponding method in the foregoing method embodiment is implemented. For the specific implementation process, refer to the foregoing method implementation. For example, its implementation principle and technical effect are similar, and details are not repeated here.

An embodiment of the present application further provides a computer program product, including a computer program, when the computer program is executed by a processor, the method as described in any one of the foregoing method embodiments can be implemented. For the specific implementation process, reference may be made to the foregoing method embodiments. , its implementation principle and technical effect are similar, and details are not repeated here.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

A data transmission method, comprising:

receive a reconfiguration message;

If the reconfiguration message includes non-incremental configuration indication information, buffer the data packets buffered on the data radio bearer DRB resources, and release the DRB resources;

After rebuilding the DRB, the buffered data packets are transmitted.
The method according to claim 1, wherein the receiving a reconfiguration message comprises:

The reconfiguration message is received through the radio resource control RRC layer.
The method according to claim 2, wherein the buffering the data packets buffered on the data radio bearer DRB resources and releasing the DRB resources comprises:

The RRC layer sends first indication information to the PDCP layer of the Packet Data Convergence Protocol, where the first indication information is used to instruct the PDCP layer to buffer the data packets buffered on the DRB resources and release the DRB resources ;

The data packets buffered on the DRB resource are buffered by the PDCP layer according to the first indication information, and the DRB resource is released.
The method according to any one of claims 1-3, wherein buffering the data packets buffered on the DRB resource comprises:

establishing an association relationship between the data packet cached on the DRB resource and the Evolved Packet System EPS bearer ID or the protocol data unit PDU session ID;

According to the association relationship between the data packet and the Evolved Packet System EPS bearer ID or PDU session ID, the data packet buffered on the DRB resource is buffered.
The method according to claim 4, wherein the transmitting the buffered data packet comprises:

Acquire the cached data packet according to the association relationship between the data packet and the Evolved Packet System EPS bearer ID or PDU session ID;

The buffered data packets are transmitted.
The method according to claim 2 or 3, further comprising:

Send a notification message to the RRC layer through the PDCP layer, where the notification message is used to indicate that the DRB resource has been released;

Sending, by the RRC layer, second indication information to the PDCP layer according to the reconfiguration message, where the second indication information is used to instruct the PDCP layer to rebuild the DRB;

The DRB is reconstructed by the PDCP layer according to the second indication information.
The method according to any one of claims 1-3, wherein the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection re-establishment.
A data transmission device, comprising:

a receiving module for receiving the reconfiguration message;

a processing module, configured to buffer the data packets buffered on the data radio bearer DRB resource if the reconfiguration message includes non-incremental configuration indication information, and release the DRB resource;

and a sending module, configured to transmit the buffered data packets after rebuilding the DRB.
An electronic device, comprising:

processors, memories, interfaces to communicate with other devices;

the memory stores computer-executable instructions;

The processor executes the computer-executable instructions stored in the memory, so that the processor executes the data transmission method of any one of claims 1 to 7.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, is used to implement the invention as claimed in any one of claims 1 to 7. the data transfer method described.
A computer program product, comprising a computer program, characterized in that, when the computer program is executed by a processor, the method according to any one of claims 1-7 is implemented.