CN112702765B - Data transmission method, device, equipment and storage medium - Google Patents

Data transmission method, device, equipment and storage medium Download PDF

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Publication number
CN112702765B
CN112702765B CN202011527194.2A CN202011527194A CN112702765B CN 112702765 B CN112702765 B CN 112702765B CN 202011527194 A CN202011527194 A CN 202011527194A CN 112702765 B CN112702765 B CN 112702765B
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drb
layer
resource
data
data packet
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CN112702765A (en
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夏少华
石峰
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Priority to CN202011527194.2A priority Critical patent/CN112702765B/en
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Priority to PCT/CN2021/131313 priority patent/WO2022134958A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the application provides a data transmission method, a device, equipment and a storage medium, wherein the method comprises the following steps: receiving a reconfiguration message; if the reconfiguration message includes non-incremental configuration indication information, caching a data packet cached on a Data Radio Bearer (DRB) resource, and releasing the DRB resource; after reconstructing the DRB, the buffered data packets are transmitted. The method of the embodiment of the application does not lose at the wireless protocol stack layer, namely the wireless protocol stack achieves lossless data transmission. And the delay is smaller than if the packet is retransmitted through the upper or application layer.

Description

Data transmission method, device, equipment and storage medium
Technical Field
Embodiments of the present application relate to the field of communications technologies, and in particular, to a data transmission method, apparatus, device, and storage medium.
Background
With the development of communication technology, a New air interface (NR) system is increasingly used. In the NR system, a non-incremental configuration full Config indication is often carried in a configuration message for performing cell handover or in a first reconfiguration message after radio resource control (Radio Resource Control, RRC) connection reestablishment. After receiving the full Config indication, the terminal device needs to release all data radio bearer (Data Radio Bearer, DRB) resources configured currently, and then reestablishes the DRB according to the reconfiguration message.
In the related art, when releasing DRB resources, a packet data convergence protocol (Packet Data Convergence Protocol, PDCP) module releases all buffered data packets, where the buffered data packets include: service data units (Service Data Unit, SDUs) received from an upper layer but not yet submitted to the lower layer transmission, and SDUs that have been submitted to the lower layer transmission but have not yet received an acknowledgement of a successful transmission from the lower layer. These discarded packets can only be retransmitted by the upper layer transmission control protocol (Transmission Control Protocol, TCP)/IP or application layer, and the retransmission interval of the upper layer TCP/IP or application layer is generally in the second level, so that the delay is larger, and the application sensitive to the delay has a larger influence.
Disclosure of Invention
The embodiment of the application provides a data transmission method, a device, equipment and a storage medium, which are used for reducing the delay of data packet transmission.
In a first aspect, an embodiment of the present application provides a data transmission method, including:
receiving a reconfiguration message;
if the reconfiguration message includes non-incremental configuration indication information, caching a data packet cached on a Data Radio Bearer (DRB) resource, and releasing the DRB resource;
after reconstructing the DRB, the buffered data packets are transmitted.
In one possible implementation manner, the receiving the reconfiguration message includes:
and receiving the reconfiguration message through a Radio Resource Control (RRC) layer.
In one possible implementation manner, the buffering the data packet buffered on the data radio bearer DRB resource and releasing the DRB resource includes:
transmitting, by the RRC layer, first indication information to a packet data convergence protocol PDCP layer, where the first indication information is used to instruct the PDCP layer to cache a data packet cached on the DRB resource and release the DRB resource;
and caching the data packet cached on the DRB resource according to the first indication information through the PDCP layer, and releasing the DRB resource.
In one possible implementation manner, the buffering the data packet buffered on the DRB resource includes:
establishing an association relation between the data packet cached on the DRB resource and an evolution packet system bearer identification ID or a protocol data unit PDU session identification ID;
and caching the data packet cached on the DRB resource according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID.
In one possible implementation manner, the transmitting the buffered data packet includes:
acquiring the cached data packet according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID;
and transmitting the cached data packet.
In one possible implementation, the method further includes:
sending a notification message to the RRC layer through the PDCP layer, wherein the notification message is used for indicating that the DRB resource is released completely;
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 reconstruct a DRB;
and reconstructing DRB according to the second indication information through the PDCP layer.
In one possible implementation, the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection reestablishment.
In a second aspect, an embodiment of the present application provides a data transmission apparatus, including:
the receiving module is used for receiving the reconfiguration message;
a processing module, configured to buffer a data packet buffered on a data radio bearer DRB resource and release the DRB resource if the reconfiguration message includes non-incremental configuration indication information;
and the sending module is used for transmitting the cached data packet after reconstructing the DRB.
In one possible implementation, the receiving module is specifically configured to:
and receiving the reconfiguration message through a Radio Resource Control (RRC) layer.
In one possible implementation manner, the processing module is specifically configured to:
transmitting, by the RRC layer, first indication information to a packet data convergence protocol PDCP layer, where the first indication information is used to instruct the PDCP layer to cache a data packet cached on the DRB resource and release the DRB resource;
and caching the data packet cached on the DRB resource according to the first indication information through the PDCP layer, and releasing the DRB resource.
In one possible implementation manner, the processing module is specifically configured to:
establishing an association relation between the data packet cached on the DRB resource and an EPS bearing identification ID or a protocol data unit PDU session identification ID;
and caching the data packet cached on the DRB resource according to the association relation between the data packet and the EPS bearing identification ID or PDU session identification ID of the evolution packet system.
In one possible implementation manner, the generating module is specifically configured to:
acquiring the cached data packet according to the association relation between the data packet and the EPS bearing ID or PDU session ID of the evolution packet system;
and transmitting the cached data packet.
In one possible implementation, the processing module is further configured to:
sending a notification message to the RRC layer through the PDCP layer, wherein the notification message is used for indicating that the DRB resource is released completely;
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 reconstruct a DRB;
and reconstructing DRB according to the second indication information through the PDCP layer.
In one possible implementation, the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection reestablishment.
In a third aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of any of the first aspects.
In a fourth aspect, an embodiment of the present application provides an electronic device, including:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the method of any of the first aspects via execution of the executable instructions.
In a fifth aspect, an embodiment of the present application provides a computer program product comprising a computer program which, when executed by a processor, implements a method according to any of the first aspects.
The data transmission method, the device, the equipment and the storage medium provided by the embodiment of the application receive the reconfiguration message; if the reconfiguration message includes non-incremental configuration indication information, caching the data packet cached on the data radio bearer DRB resource, and releasing the DRB resource; after the DRB is rebuilt, the cached data packet is transmitted, so that packet loss can not occur at the wireless protocol stack layer when the DRB resource is released, namely, the wireless protocol stack can realize lossless data transmission; and the delay is smaller than if the packet is retransmitted through the upper or application layer.
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 according to an embodiment of the present application;
fig. 2 is a flow chart of an embodiment of a data transmission method according to the present application;
FIG. 3 is a schematic diagram of an interaction flow of an embodiment of a data transmission method according to the present application;
fig. 4 is a schematic diagram of an interaction flow of another embodiment of a data transmission method provided by the present application;
fig. 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.
Specific embodiments of the present disclosure have been shown by way of the above drawings and will be described in more detail below. These drawings and the 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 reference to specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the drawings are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
First, the application relates to a part of vocabulary and application scenes:
non-incremental configuration full Config refers to a non-incremental configuration manner, i.e. the network device side does not make incremental configuration based on the current configuration, but directly gives a complete set of configuration.
The terminal device in the embodiments of the present application may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user apparatus. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc., as embodiments of the present application are not limited in this regard.
In addition, the network device according to the present application may be a base station (Base Transceiver Station, BTS) in global mobile communications (Global System of Mobile communication, GSM) or code division multiple Access (Code Division Multiple Access, CDMA), a base station (NodeB, NB) in wideband code division multiple Access (Wideband Code Division Multiple Access, WCDMA), an evolved NodeB (eNB) in long term evolution (Long Term Evolution, LTE) or enhanced long term evolution (evolved Long Term Evolution, eete), or a next generation-evolved NodeB (ng-eNB), an Access Point (AP) or a relay station in WLAN, a gNB in 5G NR, an Access device in a future communication network, or the like, which is not limited herein.
Fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present application, where the network architecture according to the present application is based on the network architecture shown in fig. 1, and the network architecture includes at least one terminal device 100, which communicates with a network device 200 through a wireless interface, and only one terminal device and one network device are shown in fig. 1 for clarity.
In the NR system, a non-incremental configuration full Config indication is often carried in a configuration message for performing cell handover or in a first reconfiguration message after radio resource control (Radio Resource Control, RRC) connection reestablishment. After receiving the full Config indication, the terminal device needs to release all data radio bearer (Data Radio Bearer, DRB) resources configured currently, and then reestablishes the DRB according to the reconfiguration message.
In the related art, when releasing DRB resources, a packet data convergence protocol (Packet Data Convergence Protocol, PDCP) module releases all buffered data packets, where the buffered data packets include: service data units (Service Data Unit, SDUs) received from an upper layer but not yet submitted to the lower layer transmission, and SDUs that have been submitted to the lower layer transmission but have not yet received an acknowledgement of a successful transmission from the lower layer. These discarded packets can only be retransmitted by the upper layer transmission control protocol (Transmission Control Protocol, TCP)/IP or application layer, and the retransmission interval of the upper layer TCP/IP or application layer is generally in the second level, so that the delay is larger, and the application sensitive to the delay has a larger influence.
The retransmission of the application layer generally needs to wait until the network equipment side sends a retransmission instruction or does not receive feedback of the network equipment side within a preset duration, so that the time delay is larger, and the user experience is seriously affected.
If the reconfiguration message includes non-incremental configuration indication information, caching the data packet cached on the data radio bearer DRB resource, and releasing the DRB resource; after the DRB is rebuilt, the cached data packet is transmitted, so that packet loss can not occur at the wireless protocol stack layer when the DRB resource is released, namely, the wireless protocol stack can realize lossless data transmission; the delay for retransmitting the data packet is in the order of milliseconds, while the delay for retransmitting the data packet by the upper layer or the application layer is in the order of seconds, and thus is smaller than the delay for retransmitting the data packet by the upper layer or the application layer.
The technical scheme of the application is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 2 is a flow chart of an embodiment of a data transmission method according to the present application. As shown in fig. 2 and 3, the method provided in this embodiment includes:
step 101, receiving reconfiguration information.
Specifically, the terminal device receives the reconfiguration message sent by the network device side.
In an embodiment, the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection reestablishment.
Step 102, if the reconfiguration message includes non-incremental configuration indication information, buffering the data packet buffered on the data radio bearer DRB resource, and releasing the DRB resource.
Specifically, for the scenario of releasing the DRB resource caused by the full Config, in the related art, the DRB resource is released, and the data packet cached on the DRB resource is discarded.
Wherein the cached data packet comprises: SDUs received from the upper layer but not yet submitted to the bottom layer transmission, and SDUs that have been submitted to the bottom layer transmission but not yet received an acknowledgement of successful transmission from the bottom layer.
Step 103, after reconstructing the DRB, transmitting the buffered data packet.
Specifically, after the DRB is reestablished, the cached data packet is retransmitted preferentially, so that packet loss cannot occur at the wireless protocol stack layer when the DRB resource is released, namely, the wireless protocol stack achieves lossless data transmission. Because the DRB resource is released and rebuilt according to the signaling of the same reconfiguration message, the delay of transmitting the stored data packet after the rebuilding is generally in the millisecond level, and compared with the retransmission of the data packet through an upper layer or an application layer, the delay is smaller.
The method of the present embodiment receives a reconfiguration message; if the reconfiguration message includes non-incremental configuration indication information, caching the data packet cached on the data radio bearer DRB resource, and releasing the DRB resource; after the DRB is rebuilt, the cached data packet is transmitted, so that packet loss can not occur at the wireless protocol stack layer when the DRB resource is released, namely, the wireless protocol stack can realize lossless data transmission; and the delay is smaller than if the packet is retransmitted through the upper or application layer.
On the basis of the above embodiment, step 101 may be implemented as follows:
and receiving the reconfiguration message through a Radio Resource Control (RRC) layer.
Specifically, the radio resource control RRC layer receives the reconfiguration message, and if the reconfiguration message carries non-incremental configuration full Config indication information, instructs the PDCP layer to keep the data packet cached on the DRB resource when notifying the PDCP layer to release the DRB resource.
In one embodiment, as shown in FIG. 4, step 102 may be implemented as follows:
transmitting first indication information to a packet data convergence protocol PDCP layer through the RRC layer, wherein the first indication information is used for indicating the PDCP layer to buffer data packets buffered on DRB resources and releasing the DRB resources;
and caching the data packet cached on the DRB resource according to the first indication information through the PDCP layer, and releasing the DRB resource.
Specifically, the RRC layer receives the reconfiguration message, and if the reconfiguration message carries non-incremental configuration full Config indication information, the RRC layer sends first indication information to the PDCP layer, where the first indication information is used to instruct the PDCP layer to buffer a data packet buffered on the DRB resource when the PDCP layer releases the DRB resource. Wherein the cached data comprises: PDCP receives SDUs from the upper layer that have not been submitted to the bottom layer for transmission, and SDUs that have been submitted to the bottom layer for transmission but have not received an acknowledgement of successful transmission from the bottom layer.
And the PDCP layer caches the data packet cached 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, and when the PDCP layer is instructed to release the DRB resource, the data packet cached on the DRB resource is cached, which is simple in implementation process.
In one embodiment, the step of "buffering the data packets buffered on the DRB resource" may be implemented as follows:
establishing an association relationship between the data packet cached on the DRB resource and an evolution packet system (Evolved Packet System, EPS) bearing identification ID, or a protocol data unit (Protocol Data Unit, PDU) session identification ID;
and caching the data packet cached on the DRB resource according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID.
Specifically, if the current network is a Non-independent (NSA) networking network, namely an LTE system, the PDCP layer establishes an association between a data packet and an EPS bearer ID; if the current network is a Stand Alone (SA) networking network, i.e., a 5G system, the PDCP layer establishes an association between the data packet and the PDU session ID.
The EPS bearer is a bearer from the terminal device to the core network. The 5G network refers to a path established between the terminal device and the external network as a PDU Session (Session).
The PDCP firstly stores the data packet cached on the DRB resource according to the first indication information of the RRC layer, and establishes an association relation between the stored data packet and the EPS bearing ID associated with the DRB resource or establishes an association relation between the stored data packet and the PDU session ID associated with the DRB resource. The DRB resources are then released.
In one embodiment, step 103 may be implemented as follows:
acquiring a cached data packet according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID;
and transmitting the buffered data packets.
Specifically, after the DRB is rebuilt, an 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 cached data packet is transmitted.
In the above 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, and after the DRB is rebuilt, the stored data packet can be found quickly according to the association relationship, so that transmission is performed, efficiency is higher, and delay is smaller.
In one embodiment, the method further comprises:
sending a notification message to the RRC layer through the PDCP layer, wherein the notification message is used for indicating that the DRB resource is released completely;
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 reconstruct a DRB;
and reconstructing DRB according to the second indication information through the PDCP layer.
Specifically, the PDCP layer notifies the RRC layer that release is completed after the DRB resource release is completed, for example, sends a notification message indicating that release of the DRB resource is completed.
After receiving the notification message of the completion of the release of the PDCP layer, the RRC layer then notifies the PDCP layer to reestablish the DRB according to the reconfiguration message, i.e., sends second indication information to the PDCP layer, where the second indication information is used to instruct the PDCP layer to reestablish the DRB.
The PDCP layer reestablishes the DRB according to the second indication information, then finds the stored data packets according to the EPS bearing ID or PDU session ID associated with the DRB and the association relation, and preferentially transmits the data packets. And after the transmission of the data packets is completed, the data packets newly received from the upper layer are sent.
In one embodiment, the data transmission method includes the steps of:
step 1, receiving the reconfiguration message through a Radio Resource Control (RRC) layer;
step 2, if the reconfiguration message includes non-incremental configuration indication information, sending, by the RRC layer, first indication information to a PDCP layer, where the first indication information is used to instruct the PDCP layer to cache a data packet cached on the DRB resource and release the DRB resource;
step 3, establishing an association relationship between the data packet cached on the DRB resource and an evolved packet system bearer identification ID or a protocol data unit PDU session identification ID according to the first indication information through the PDCP layer;
step 4, caching the data packet cached on the DRB resource according to the association relation between the data packet and the evolution packet system bearer identification ID or the PDU session identification ID;
step 5, releasing the DRB resource;
step 6, sending a notification message to the RRC layer through the PDCP layer, wherein the notification message is used for indicating that the DRB resource is released completely;
step 7, 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 reconstruct a DRB;
step 8, reconstructing DRB according to the second indication information through the PDCP layer;
step 9, obtaining the cached data packet according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID;
step 10, transmitting the cached data packet
In the method of the embodiment, if the reconfiguration message includes non-incremental configuration indication information, the PDCP layer caches the data packet cached on the DRB resource of the data radio bearer, and releases the DRB resource; after the DRB is rebuilt, the cached data packet is transmitted through the PDCP layer, so that packet loss does not occur at the wireless protocol stack layer when the DRB resource is released, namely, the wireless protocol stack can realize lossless data transmission; the delay for retransmitting the data packet is in the order of milliseconds, while the delay for retransmitting the data packet by the upper layer or the application layer is in the order of seconds, and thus is smaller than the delay for retransmitting the data packet by the upper layer or the application layer.
Fig. 5 is a schematic structural diagram of an embodiment of a data transmission device according to the present application, as shown in fig. 5, where the data transmission device of the present embodiment includes:
a receiving module 110, configured to receive a reconfiguration message;
a processing module 111, configured to buffer a data packet buffered on a data radio bearer DRB resource and release the DRB resource if the reconfiguration message includes non-incremental configuration indication information;
a sending module 112, configured to transmit the buffered data packet after reconstructing the DRB.
In one possible implementation, the receiving module 110 is specifically configured to:
and receiving the reconfiguration message through a Radio Resource Control (RRC) layer.
In one possible implementation, the processing module 111 is specifically configured to:
transmitting, by the RRC layer, first indication information to a packet data convergence protocol PDCP layer, where the first indication information is used to instruct the PDCP layer to cache a data packet cached on the DRB resource and release the DRB resource;
and caching the data packet cached on the DRB resource according to the first indication information through the PDCP layer, and releasing the DRB resource.
In one possible implementation, the processing module 111 is specifically configured to:
establishing an association relation between the data packet cached on the DRB resource and an evolution packet system bearer identification ID or a protocol data unit PDU session identification ID;
and caching the data packet cached on the DRB resource according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID.
In one possible implementation, the generating module 112 is specifically configured to:
acquiring the cached data packet according to the association relation between the data packet and the evolved packet system bearer identification ID or the PDU session identification ID;
and transmitting the cached data packet.
In one possible implementation, the processing module 111 is further configured to:
sending a notification message to the RRC layer through the PDCP layer, wherein the notification message is used for indicating that the DRB resource is released completely;
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 reconstruct a DRB;
and reconstructing DRB according to the second indication information through the PDCP layer.
In one possible implementation, the reconfiguration message is a configuration message for performing cell handover or a reconfiguration message after RRC connection reestablishment.
The device of the present embodiment may be used to execute the technical solution of the foregoing method embodiment, and its implementation principle and technical effects are similar, and are not described herein again.
Fig. 6 is a schematic structural diagram of an embodiment of an electronic device according to the present application, as shown in fig. 6, where the electronic device includes:
a processor 210, and a memory 211 for storing executable instructions of the processor 210.
Optionally, the method may further include: communication interface 212 is used to enable communication with other devices.
The 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, and the specific implementation process may refer to the foregoing method embodiment and will not be described herein.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, the computer program when executed by a processor implements a method corresponding to the foregoing method embodiment, and the specific implementation process of the computer program may refer to the foregoing method embodiment, and its implementation principle and technical effect are similar, and will not be repeated herein.
The embodiment of the present application further provides a computer program product, which includes a computer program, where the computer program when executed by a processor implements a method according to any one of the foregoing method embodiments, and a specific implementation process of the computer program product may refer to the foregoing method embodiment, and its implementation principle and technical effect are similar, and are not repeated herein.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a 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 arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (8)

1. A data transmission method applied to a terminal device, comprising:
receiving a reconfiguration message through a Radio Resource Control (RRC) layer;
if the reconfiguration message comprises non-incremental configuration indication information, caching a data packet cached on a Data Radio Bearer (DRB) resource through a Packet Data Convergence Protocol (PDCP) layer, and releasing the DRB resource; wherein the cached data packet comprises: the PDCP layer has received from an upper layer but has not yet submitted to a service data unit SDU transmitted from the lower layer, and/or the PDCP layer has submitted to an SDU transmitted from the lower layer but has not yet received an acknowledgement of successful transmission from the lower layer;
transmitting the buffered data packets after reconstructing the DRB;
the caching the data packet cached on the Data Radio Bearer (DRB) resource through a Packet Data Convergence Protocol (PDCP) layer, and releasing the DRB resource, comprising:
sending, by the RRC layer, first indication information to the PDCP layer, where the first indication information is used to instruct the PDCP layer to cache a data packet cached on the DRB resource, and release the DRB resource;
and caching the data packet cached on the DRB resource according to the first indication information through the PDCP layer, and releasing the DRB resource.
2. The method of claim 1 wherein buffering the data packets buffered on the DRB resource comprises:
establishing an association relation between the data packet cached on the DRB resource and an EPS bearing identification ID or a protocol data unit PDU session identification ID;
and caching the data packet cached on the DRB resource according to the association relation between the data packet and the EPS bearing identification ID or PDU session identification ID of the evolution packet system.
3. The method of claim 2, wherein said transmitting said buffered data packets comprises:
acquiring the cached data packet according to the association relation between the data packet and the EPS bearing ID or PDU session ID of the evolution packet system;
and transmitting the cached data packet.
4. The method as recited in claim 1, further comprising:
sending a notification message to the RRC layer through the PDCP layer, wherein the notification message is used for indicating that the DRB resource is released completely;
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 reconstruct a DRB;
and reconstructing DRB according to the second indication information through the PDCP layer.
5. The method according to claim 1, wherein the reconfiguration message is a configuration message for performing a cell handover or a reconfiguration message after RRC connection reestablishment.
6. A data transmission apparatus applied to a terminal device, comprising:
a receiving module, configured to receive a reconfiguration message through a radio resource control RRC layer;
a processing module, configured to buffer a data packet buffered on a data radio bearer DRB resource through a packet data convergence protocol PDCP layer and release the DRB resource if the reconfiguration message includes non-incremental configuration indication information; wherein the cached data packet comprises: the PDCP layer has received from an upper layer but has not yet submitted to a service data unit SDU transmitted from the lower layer, and/or the PDCP layer has submitted to an SDU transmitted from the lower layer but has not yet received an acknowledgement of successful transmission from the lower layer;
a sending module, configured to, after reconstructing the DRB, transmit the buffered data packet;
the processing module is specifically configured to:
sending, by the RRC layer, first indication information to the PDCP layer, where the first indication information is used to instruct the PDCP layer to cache a data packet cached on the DRB resource, and release the DRB resource;
and caching the data packet cached on the DRB resource according to the first indication information through the PDCP layer, and releasing the DRB resource.
7. An electronic device, comprising:
a processor, a memory, an interface to communicate with other devices;
the memory stores computer-executable instructions;
the processor executing computer-executable instructions stored in the memory, causing the processor to perform the data transmission method of any one of claims 1 to 5.
8. A computer-readable storage medium, in which computer-executable instructions are stored, which when executed by a processor are adapted to implement the data transmission method of any one of claims 1 to 5.
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