WO2018137720A1

WO2018137720A1 - Method and device for data synchronization

Info

Publication number: WO2018137720A1
Application number: PCT/CN2018/077933
Authority: WO
Inventors: 邱禹; 全海洋; 鲍炜
Original assignee: 电信科学技术研究院有限公司
Priority date: 2017-01-25
Filing date: 2018-03-02
Publication date: 2018-08-02
Also published as: CN108347468A; CN108347468B

Abstract

A method and a device for data synchronization are disclosed. The invention provides a processing method to be used when terminal and network-side device decompression data become unsynchronized. The method comprises: a terminal determines that compression data of said terminal is not synchronized with decompression data of a network-side device; the terminal processes the compression data of said terminal, such that said data becomes synchronized with the decompression data of the network-side device. In embodiments of the present invention, when compression data of a terminal is not synchronized with decompression data of a network-side device, by means of processing the compression data of the terminal once terminal and network-side device decompression data become unsynchronized, the compression data of the terminal and the decompression data of the network-side device may be synchronized, thereby improving system performance.

Description

Method and device for data synchronization

This application claims the priority of the Chinese Patent Application filed on Jan. 25, 2017, filed on Jan. 25, 2017, filed Jan. In the application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and device for performing data synchronization.

Background technique

In the Long Term Evolution (LTE)/LTE-Advanced (LTE-A) technology, the terminal can be configured with the Uplink Data Compression (UDC) function to compress and upload the uplink data. The compressed uplink data is decompressed according to the decompressed data. The terminal and the network side device should have synchronized decompressed data. For example, the terminal and the network side device respectively maintain synchronized compressed cache data or a synchronized compressed cache index list, so as to facilitate matching according to the uplink data and the cached data, thereby improving compression. The compression ratio of the data.

When the uplink data transmission fails or the radio link fails, the decompressed data of the terminal and the network side device may be out of synchronization, and once the decompressed data of the terminal and the network side device are not synchronized, the terminal may be compressed. The data cannot be properly decompressed on the network side device.

At present, there is no processing scheme after the decompressed data of the terminal and the network side device are out of synchronization.

Summary of the invention

The embodiment of the invention provides a method and a device for performing data synchronization, which are used to provide a processing method after the terminal and the network side device use the decompressed data to be out of synchronization.

In a first aspect, the present invention provides a method for performing data synchronization, where the method includes: determining, by the terminal, that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression; and the terminal for compressing the terminal. The data is processed such that the data used by the terminal for compression is synchronized with the data used by the network side device for decompression.

Optionally, the terminal determines that the data used by the terminal for the compression is not synchronized with the data that is used by the network side device to perform the decompression, and includes: if the terminal receives the indication information that is sent by the network side device, indicating that the cache is out of synchronization, or needs to be related to the network side. The device performs radio resource control (RRC) connection establishment, and determines that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression.

Optionally, the terminal receives the indication information indicating that the cache is out of synchronization by using an RRC reconfiguration message or a Media Access Control (MAC) control unit.

Optionally, the indication information indicating that the cache is out of synchronization is a Packet Data Convergence Protocol (PDCP) status report.

Optionally, the data used for compression is data in the compression cache; and the terminal processes the data used by the terminal for compression, including: the terminal deletes redundant data in the compression cache according to the PDCP status report.

Optionally, the data used for compression is data in the compression buffer; the terminal processes the data used by the terminal for compression, including: the terminal clears the data in the compression buffer; or the terminal sends the data in the compression buffer to the network. Side equipment.

Optionally, the terminal sends the data in the compressed cache to the network side device, where the terminal sends the data in the compressed cache to the network side device through the user plane, or sends the data in the compressed cache to the network through the control plane RRC message. Side equipment.

Optionally, the data used for compression is a compressed cache index list; and the terminal processes the data used by the terminal for compression, including: the terminal notifying the compressed cache index list used by the network side device.

Optionally, the terminal notifying the compressed cache index list used by the network side device includes: the terminal notifying the compressed cache index list used by the network side device by using the RRC message.

In a second aspect, the present invention provides another method for performing data synchronization, where the method includes: the network side device determines that the data used for decompression is not synchronized with the data used by the terminal for compression; and the network side device pair is used to perform the solution. The compressed data is processed such that the data used by the network side device for decompression is synchronized with the data used by the terminal for compression.

Optionally, the network side device determines that the data used for decompression is not synchronized with the data used by the terminal for compression, and includes: if the network side device determines that the abnormal condition is met, determining that the data used for decompression is used by the terminal. The data to be compressed is not synchronized; wherein the abnormal condition includes part or all of the following: the verification of the cache check bit carried in the compressed data sent by the terminal fails; the demodulation of the compressed data sent by the terminal fails; the wireless link A fault has occurred; an RRC connection setup with the terminal is required.

Optionally, the data used for decompressing is the data in the compressed cache; the network side device processes the data used for decompression, including: the network side device clears the data in the compressed cache, and sends the indication cache to the terminal. The unsynchronized indication information, so that the terminal clears the data in the compression buffer; or the network side device replaces the data in the compression buffer of the received terminal with the data in the compression buffer of the network side device; or the network side device sends the PDCP to the terminal. Status report to enable the terminal to delete redundant data in the compressed cache.

Optionally, after the network side device determines that the data used for decompression is not synchronized with the data used by the terminal for compression, before replacing the data in the compressed buffer of the received terminal with the data in the compression buffer of the network side device, The method further includes: the network side device sending, to the terminal, indication information indicating that the cache is out of synchronization.

Optionally, the network side device receives the data in the compressed cache of the terminal by using an RRC message.

Optionally, the data used for decompression is a compressed cache index list; the network side device processes the data used for decompression, and the network side device determines, according to the notification of the terminal, the compressed cache index list used by the terminal.

Optionally, after the network side device determines that the data for performing decompression is not synchronized with the data used by the terminal for performing compression, before determining the compressed cache index list used by the terminal according to the notification of the terminal, the network side device further includes: the network side device sends the data to the terminal. Indicates that the cache is out of sync.

Optionally, the network side device receives the notification of the terminal by using an RRC message.

Optionally, the network side device sends the indication information indicating that the cache is out of synchronization to the terminal, where the network side device sends the indication information indicating that the cache is out of synchronization to the terminal by using an RRC reconfiguration message or a MAC control unit.

In a third aspect, the present invention provides a terminal for performing data synchronization, where the terminal includes: a first determining module, configured to determine that data used by the terminal for compression is not synchronized with data used by the network side device for decompression; And a processing module, configured to process data used by the terminal for compression, so that the data used by the terminal for compression is synchronized with the data used by the network side device for decompressing.

Optionally, the first determining module is specifically configured to: if receiving the indication information indicating that the cache is out of synchronization sent by the network side device, or performing the RRC connection establishment with the network side device, determining the data used by the terminal for compression and the network side The data that the device uses for decompression is out of sync.

Optionally, the first determining module is specifically configured to: receive, by using an RRC reconfiguration message or a MAC control unit, indication information indicating that the cache is out of synchronization.

Optionally, the indication information indicating that the cache is out of synchronization is a PDCP status report.

Optionally, the data used for compression is data in the compression cache; the first processing module is specifically configured to: delete redundant data in the compression cache according to the PDCP status report.

Optionally, the data used for compression is the data in the compressed cache; the first processing module is specifically configured to: clear the data in the compressed cache; or send the data in the compressed cache to the network side device.

Optionally, the first processing module is configured to: send the data in the compression buffer to the network side device by using a user plane, or send the data in the compression buffer to the network side device by using a control plane RRC message.

Optionally, the data used for compression is a compressed cache index list; the first processing module is specifically configured to: notify a list of compressed cache indexes used by the network side device.

Optionally, the first processing module is specifically configured to: notify, by using the RRC message, the terminal to notify the compressed cache index list used by the network side device.

In a fourth aspect, the present invention provides a network side device that performs data synchronization, where the network side device includes: a second determining module, configured to determine that data used for decompression is out of synchronization with data used by the terminal for compression; And a processing module, configured to process the data used for decompression, so that the data used by the network side device for decompression is synchronized with the data used by the terminal for compression.

Optionally, the second determining module is specifically configured to: if it is determined that the abnormal condition is met, determine that the data used for performing decompression is out of synchronization with the data used by the terminal for compression; wherein the abnormal condition includes some or all of the following: The cache check bit verification carried in the compressed data sent by the terminal fails; the demodulation of the compressed data sent by the terminal fails; the radio link fails; the RRC connection establishment with the terminal is required.

Optionally, the data used for decompressing is data in the compressed cache; the second processing module is specifically configured to: clear data in the compressed cache, and send indication information indicating that the cache is out of synchronization to the terminal, so that the terminal clears and compresses The data in the cache; or the data in the compressed cache of the received terminal is replaced with the data in the compression buffer of the network side device; or the PDCP status report is sent to the terminal, so that the terminal deletes the redundant data in the compressed cache.

Optionally, the second processing module is further configured to: after determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, sending, to the terminal, indication information indicating that the cache is out of synchronization; The data in the compression cache replaces the data in the compression cache of the network side device.

Optionally, the second processing module is specifically configured to: receive data in the compressed cache of the terminal by using an RRC message.

Optionally, the data used for decompressing is a compressed cache index list; and the second processing module is specifically configured to: determine, according to the notification of the terminal, a compressed cache index list used by the terminal.

Optionally, the second processing module is further configured to: after determining that the data for performing decompression is not synchronized with the data used by the terminal for performing compression, sending, to the terminal, indication information indicating that the buffer is out of synchronization; determining, according to the notification of the terminal, the terminal A list of compressed cache indexes used.

Optionally, the second processing module is specifically configured to: receive the notification of the terminal by using an RRC message.

Optionally, the second processing module is specifically configured to: send, by using an RRC reconfiguration message or a MAC control unit, indication information indicating that the cache is out of synchronization.

In a fifth aspect, a further embodiment of the present invention further provides a terminal, where the terminal includes: a processor, a transceiver, and a memory; the processor is configured to read a program in the memory, and execute the first aspect The method of any of the preceding claims.

In a sixth aspect, a further embodiment of the present invention further provides a network side device, where the terminal includes: a processor, a transceiver, and a memory; the processor is configured to read a program in the memory, and execute the foregoing The method of any of the two aspects.

A seventh aspect, a computer storage medium storing computer executable instructions for causing the computer to perform the method of any of the above first aspects .

In an eighth aspect, a computer storage medium storing computer executable instructions for causing the computer to perform the method of any of the above second aspects .

According to the method for performing synchronous compression provided by the embodiment of the present invention, the terminal can use the data used by the terminal for compression when the terminal determines that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression. The processing is performed to synchronize the data used for the compression of the terminal with the data used by the network side device for decompression, and therefore the embodiment of the present invention can perform the solution for the data for the compression and the network side device of the terminal. When the compressed data is not synchronized, the data for compressing the terminal is processed, so that the data for the terminal and the network side device can be made after the decompressed data of the terminal and the network side device are out of synchronization. Synchronization of the data used to decompress further improves system performance.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for inventive labor.

FIG. 1 is a schematic diagram of steps of a method for performing data synchronization according to an embodiment of the present invention;

2 is a schematic diagram of steps of another method for performing data synchronization according to an embodiment of the present invention;

FIG. 3 is a flowchart of a first method for performing data synchronization according to an embodiment of the present invention;

4 is a flowchart of a second method for performing data synchronization according to an embodiment of the present invention;

FIG. 5 is a flowchart of a third method for performing data synchronization according to an embodiment of the present invention;

FIG. 6 is a flowchart of a fourth method for performing data synchronization according to an embodiment of the present invention;

FIG. 7 is a flowchart of a fifth method for performing data synchronization according to an embodiment of the present invention;

FIG. 8 is a flowchart of a method for data synchronization performed by a first stream according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a terminal for performing data synchronization according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a network side device for performing data synchronization according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another terminal for performing data synchronization according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of another network side device for performing data synchronization according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

A method for performing synchronous compression in an embodiment of the present invention is described in FIG. 1, which includes the following steps:

Step 101: The terminal determines that the data used by the terminal for compression is not synchronized with the data used by the network side device for performing decompression;

Step 102: The terminal processes the data used by the terminal for compression, so that the data used by the terminal for compression is synchronized with the data used by the network side device for decompression.

In the embodiment of the present invention, after determining that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression, the terminal can process the data used by the terminal for compression to enable the terminal to perform compression. The data is synchronized with the network side device for performing decompressed data, so that the terminal for performing compression can be implemented in the case where the data for compression of the terminal and the data used by the network side device for decompression are not synchronized. The data and the network side device are used for synchronizing the decompressed data, thereby implementing correct decompression of the uplink data.

The data used for compression in the embodiment of the present invention refers to reference data used by the terminal to compress data that needs to be compressed when performing uplink data compression, and may be used, for example, when the terminal compresses uplink data. The cached data may also be a compressed cache index list used by the terminal to compress the uplink data. The data for performing decompression in the embodiment of the present invention refers to reference data used by the network side device to decompress data to be decompressed when performing uplink data decompression, for example, the network side device may uplink. The cached data used when the data is decompressed may also be a compressed cache index list used by the network side device to decompress the uplink data.

Optionally, the terminal determines that the data used by the terminal for performing compression is not synchronized with the data that is used by the network side device to perform decompression, and the method includes: receiving, by the network device, indication information indicating that the cache is out of synchronization, or After the device performs the RRC connection establishment, it is determined that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression.

In the embodiment of the present invention, the terminal may determine that the data used for compression is not synchronized with the data used by the network side device for decompression according to the received indication information indicating that the cache is not synchronized, and the terminal may also After determining that the RRC reconfiguration needs to be performed with the network side device, it is determined that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression. The RRC connection establishment includes establishing an RRC connection, and reestablishing the RRC connection. The data used for the compression and the network side device for decompressing may be not in the process of performing the RRC connection establishment. Synchronous, so the terminal determines that the data for compression and the data of the network side device for decompression of the terminal are not synchronized when it is determined that the RRC connection needs to be established, and data synchronization is required.

Optionally, the terminal receives the indication information indicating that the cache is out of synchronization by using an RRC reconfiguration message or a MAC control unit.

In the embodiment of the present invention, after receiving the indication information indicating that the cache is out of synchronization, the terminal determines that the data used for compression is not synchronized with the data used by the network side device for decompression, wherein the terminal can pass the The RRC reconfiguration message receives indication information indicating that the cache is out of synchronization. For example, the network side device sends the indication information indicating that the cache is out of synchronization to the terminal by using the RRC reconfiguration message, and after receiving the RRC reconfiguration message, the terminal determines the data used by the terminal for compression and the network side device for decompression. The data is out of sync.

The network side device may also indicate that the cache is out of synchronization by using a newly created MAC control unit, for example, a new Flush UDC buffer MAC CE (the clear uplink data compression buffer MAC control unit), where the MAC control unit may be 8 bits or 0 bits or Control unit in other formats. As shown in Table 1, the network side device can be extended on the basis of the existing uplink shared logical channel identifier, and any one of the reserved values (Reserved) is used to indicate the newly added MAC control unit logical channel identifier (for example, an index). A unit with a value of 10100), for example, a reserved value of 01100 is selected to indicate the newly introduced MAC Control Unit Logical Channel Identity 10100.

Table 1

In the embodiment of the present invention, the terminal may determine, according to the received indication information indicating that the cache is out of synchronization, that the data used for compression is not synchronized with the data used by the network side device for decompression, wherein the indication information indicating that the cache is not synchronized is displayed. It may be a PDCP status report sent by the network side device.

After receiving the uplink data sent by the terminal, the network side device may generate and send a PDCP status report to the terminal, which is used to indicate a PDCP SDU (Service Data Unit) that is lost or lost, and the terminal receives the PDCP status report. After that, the data for self-decompression maintained by itself can be adjusted according to the indication.

In the embodiment of the present invention, after receiving the PDCP status report, the terminal can adjust the data for decompression maintained by the terminal according to the indication. If the data used for compression is data in the compression buffer, the terminal can be based on the PDCP status. The reported indication deletes the redundant data in the compressed cache. For example, the network side device notifies the terminal of the sequence number of the data packet that is not received by the PDCP status report, and the terminal receives the PDCP status report according to the PDCP. The status report deletes the data corresponding to the unreceived data packet that is cached by itself; the network side device may also indicate the serial number of the data packet successfully received by the terminal through the PDCP status report, and because the terminal knows the serial number of all the data packets sent by the terminal, The terminal knows the serial number of the data packet that has not been successfully received. After determining the serial number of the data packet that has not been successfully received, the terminal needs to delete the corresponding data in the slow compression storage.

In the embodiment of the present invention, if the data used for compression is data in the compression buffer, the terminal may clear the self-compression after determining that the data used for compression is not synchronized with the data used by the network side device for decompression. The data in the cache. For example, the terminal clears its own data for compression and the network side device clears its own data for decompression, and the data used by the terminal for compression and the data recovery synchronization state used by the network side device for decompression, After receiving the uplink compressed data, the network side device can correctly perform the decompression operation.

In the embodiment of the present invention, if the data used for compression is data in the compression buffer, the terminal may also send the data in the compression buffer to the network side device. For example, the terminal sends the data in the compressed cache stored by the terminal to the network side device, and the network side device replaces the data with its own data for decompression after receiving the data, and the terminal uses the compressed data. The data recovery state is synchronized with the network side device for decompressing data, and the network side device can correctly perform the decompression operation after receiving the uplink compressed data.

In the embodiment of the present invention, the terminal may send the data in the compressed cache to the network side device in multiple manners. For example, the terminal may send the compressed cache as the service data to the network side device through the user plane, and the terminal may also control The data in the compression buffer is placed in an RRC message (for example, an RRC reconfiguration complete message) and sent to the network side device.

The RRC message in the embodiment of the present invention may be an RRC message related to an RRC connection setup, an RRC connection reestablishment, or an RRC reconfiguration process.

Optionally, the data used for compression is a compressed cache index list; the terminal processes the data used by the terminal for compression, including: the terminal notifying the compressed cache index list used by the network side device, that is, the terminal is the network side device The compressed cache index list used is notified to the terminal.

The compressed cache index list is a list of compressed cached indexes that are pre-configured on the terminal and the network side device. Generally, the compressed cache index list of the same content is configured on the terminal and the network side device, but the compressed cache index list is compressed. Different or parsing errors, etc., the compression cache index list of the terminal and the network side device may be out of sync.

In the embodiment of the present invention, if the data used by the terminal for compression is a compressed cache index list, the terminal may notify the network side after determining that the data used for compression is not synchronized with the data used by the network side device for decompression. The compressed cache index list used by the device, so that the network side device updates its compressed cache index list according to the compressed cache index list notified by the terminal.

In addition, the terminal and the network side device may pre-configure one or more synchronized compressed cache index lists, and the terminal may also notify the network side device of the sequence number of the compressed cache index list used by the terminal, and the network side device may notify the terminal according to the terminal. The serial number uses the corresponding compressed cache index list for decompression of the upstream data.

In the embodiment of the present invention, the terminal may notify the network side device of the compressed cache index list used by the terminal by using the RRC message. In addition, the terminal may notify the network side device of the compressed cache index list used by the user as the service data by using the user plane.

As shown in FIG. 2, another method for performing data synchronization according to an embodiment of the present invention includes the following steps:

Step 201: The network side device determines that the data used for decompression is not synchronized with the data used by the terminal for compression.

Step 202: The network side device processes the data used for decompression, so that the data used by the network side device for decompression is synchronized with the data used by the terminal for compression.

In the embodiment of the present invention, after determining that the data used for decompression is not synchronized with the data used by the terminal for compression, the network side device can process the data used for decompression by itself, so that the network side device The data used for decompression is synchronized with the data used by the terminal for compression, so that the network side device can be used in the case that the data used by the network side device for decompression is not synchronized with the data used by the terminal for compression. The decompressed data is synchronized with the data used by the terminal for compression, thereby achieving correct decompression of the uplink data.

The data for performing decompression in the embodiment of the present invention refers to data used for compressing data to be compressed when the network side device performs uplink data decompression, for example, the network side device may solve the uplink data. The cached data used in the compression may also be a compressed cache index list used by the network side device to decompress the uplink data. The data used for compression in the embodiment of the present invention refers to the terminal performing uplink data compression. The data used for compressing the data to be compressed may be, for example, cached data used by the terminal to compress the uplink data, or may be a compressed cache index list used by the terminal to compress the uplink data.

Optionally, the network side device determines that the data used for decompression is not synchronized with the data used by the terminal for performing compression, and the method includes: after determining that the abnormal condition is met, the network side device determines that the data used for decompression is used by the terminal. The data to be compressed is not synchronized; wherein the abnormal condition includes part or all of the following: the verification fails according to the cache check bit carried in the compressed data sent by the terminal; the demodulation fails according to the compressed data sent by the terminal; the wireless link A fault has occurred; an RRC connection setup with the terminal is required.

In the embodiment of the present invention, after the network-side device meets the abnormal condition, the data for decompressing is not synchronized with the data used by the terminal for compression, for example, the network-side device may be carried in the compressed data sent according to the terminal. After the cache check bit fails to verify, it is determined that the data used for decompression is not synchronized with the data used by the terminal for compression. After receiving the compressed data sent by the terminal, the checksum is performed according to the cache check bit carried in the terminal. If the check fails, the network side device may determine the data used for decompression and the terminal used for compression. The data is out of sync.

In the embodiment of the present invention, after receiving the compressed data sent by the terminal, the network side device needs to decompress the compressed data. If the decompression of the network side device fails, the network side device may determine the data used for decompressing. The data used by the terminal for compression is not synchronized.

In the embodiment of the present invention, after the radio link fails, it is determined that the data used for decompression is not synchronized with the data used by the terminal for compression. For example, after determining that the current communication link quality is too poor and the link is lost, the network side device determines that the data used for decompression is out of synchronization with the data used by the terminal for compression.

In the embodiment of the present invention, if the data used for decompression is data in the compression buffer, the network side device may clear the compression buffer after determining that the data used for decompression is not synchronized with the data used by the terminal for compression. The data in the middle, and sending an indication to the terminal indicating that the cache is out of synchronization, so that the terminal clears the data in the compressed cache. For example, after determining that the decompressed amount cache data is not synchronized with the cache data used by the terminal for compression, the network side device may clear its own cache data for decompression, and notify the terminal to clear for compression. Caching data to synchronize the cached data used for decompression with the cached data of the terminal for compression (in this case, the cached data for the decompression of the network side device and the terminal are used for performing The compressed cache data is in the empty state, and the network side device can normally perform decompression of the data in the compressed cache.

In the embodiment of the present invention, if the data used for decompression is data in the compression buffer, the network side device may receive the data after determining that the decompressed data is not synchronized with the data used by the terminal for compression. The data in the compression cache of the terminal replaces the data in the compression cache of the network side device. For example, after determining that the decompressed amount cache data is not synchronized with the cache data used by the terminal for compression, the network side device may receive the cache data sent by the terminal for compression and replace it with itself for decompression. The data is buffered so that the cached data for decompressing itself and the cached data for compression of the terminal are restored in synchronization, and the network side device can normally perform decompression of the compressed data.

In the embodiment of the present invention, if the data used for decompression is data in the compression buffer, the network side device may send the data to the terminal after determining that the data for performing decompression is not synchronized with the data used by the terminal for compression. The PDCP status report is used to cause the terminal to delete redundant data in the compressed cache. The PDCP status report is used to indicate a PDCP SDU that fails to be transmitted or lost, so that after receiving the PDCP status report, the terminal can adjust the data that is maintained by the terminal for decompression according to the indication. For example, after receiving the data in the compressed cache, the network side device determines the lost data packet and generates a PDCP status report indicating that the data packet is lost, and indicates, by using the PDCP status report, the data in the compressed cache corresponding to the data packet of the terminal is After the PDCP status report is received, the terminal deletes the data corresponding to the data packet buffered by the network according to the PDCP status report, so that the cached data used by the network side device for decompression and the terminal are used for performing The compressed cache data is restored to the synchronization state, and the network side device can normally perform decompression of the data in the compression cache.

In the embodiment of the present invention, after determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, the network side device may send indication information indicating that the cache is out of synchronization to the terminal, so that the terminal sends the indication information to the network according to the indication information. The side device sends the data in the compressed cache of the terminal, and after receiving the data in the compressed cache sent by the terminal, the network side device replaces the data with the data in the compressed cache.

In the embodiment of the present invention, if the data used for decompression is a compressed cache index list, the network side device may perform notification according to the terminal after determining that the data used for decompression is not synchronized with the data used by the terminal for compression. Determine the list of compressed cache indexes used by the terminal. For example, the terminal indicates a compressed cache index list used by the network side device itself, and the network side device receives the compressed cache index list and performs decompression processing according to the compressed cache index list indicated by the terminal, so that the compressed data can be correctly decompressed.

In addition, the terminal and the network side device may pre-configure the at least one synchronized compressed cache index list, and the terminal may also notify the network side device of the sequence number of the compressed cache index list used by the terminal, and the network side device may according to the sequence notified by the terminal. The number uses the corresponding compressed cache index list for decompression of the upstream data.

In the embodiment of the present invention, after determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, the network side device may send indication information indicating that the cache is out of synchronization to the terminal, so that the terminal sends the indication information to the network according to the indication information. The side device sends a compressed cache index list used by the terminal, and after receiving the compressed cache index list sent by the terminal, the network side device uses the compressed cache index list to decompress the compressed data.

In the embodiment of the present invention, the network side device may receive the compressed cache index list sent by the terminal through the RRC message of the control plane. In addition, the network side device may also receive the compressed cache index list sent by the terminal through the user plane.

In the embodiment of the present invention, the network side device may send, by using an RRC reconfiguration message, indication information indicating that the cache is out of synchronization. For example, after the network side device clears the data in the compressed cache, the RRC reconfiguration message sent to the terminal carries the indication information indicating that the cache is out of synchronization, so that the terminal clears the data in the compressed cache.

In the embodiment of the present invention, the network side device page may send, by using a MAC control unit, indication information indicating that the cache is out of synchronization. For example, after the network side device clears the data in the compressed cache, the MAC control unit sends the indication information indicating that the cache is out of synchronization to the terminal, so that the terminal clears the data in the compressed cache. For example, as shown in Table 1, the network side device may select any one of the reserved values for indicating the newly added MAC control unit, for example, selecting the reserved value 01100 as the MAC control unit indicating the newly introduced.

The data used for compression by the terminal in the embodiment of the present invention may be the data in the compression buffer of the terminal, or may be a compressed cache index list pre-configured by the terminal, and the data used by the network side device for decompression may be the network side device. The data in the compressed cache may also be a compressed cache index list pre-configured by the network side device. The following describes the method for performing data synchronization provided by the embodiment of the present invention.

If the data used by the terminal for compression is the data in the terminal compression buffer, and the data used by the network side device for decompression is the data in the network side device compression buffer, the method for performing data synchronization provided by the present invention is shown in FIG. 3 . 4, FIG. 5 and FIG. 6; if the data used by the terminal for compression is a compressed cache index list used by the terminal, and the data used by the network side device for decompression is a compressed cache index list used by the network side device, The method for performing data synchronization provided by the present invention is shown in FIGS. 7 and 8.

As shown in FIG. 3, the first method for performing data synchronization provided by the embodiment of the present invention includes the following steps:

Step 301: The network side device determines that the data in the compressed cache is out of synchronization with the data in the terminal compression cache.

Step 302: The network side device clears data in its own compression cache.

Step 303: The network side device sends, to the terminal, indication information indicating that the cache is out of synchronization.

Step 304: After receiving the indication information, the terminal clears the data in its own compression cache, and then ends the process.

After the terminal compresses the UDC technology and sends the uplink compressed data to the network side device, the network side device determines that the cache check bit carried in the compressed data sent by the terminal fails to be verified, and determines that the compressed data sent by the terminal fails to be demodulated. Or, after determining that the wireless link is faulty, it is determined that the data used for decompression is not synchronized with the data used by the terminal for compression.

According to the method for performing data synchronization as shown in FIG. 3, after determining that the data in the compressed cache is not synchronized with the data in the compressed cache of the terminal, the network side device can clear the data in the compressed cache and notify the terminal by using the indication information. After the data in the compressed cache is cleared, the data in the network-side device and the terminal compression buffer are cleared, and the network-side device can perform the decompression of the uplink compressed data. The network-side device can newly add the RRC reconfiguration message. The indication information of the compressed cache may also be instructed by the newly defined MAC control unit to clear the compressed cache.

As shown in FIG. 4, the second method for performing data synchronization provided by the embodiment of the present invention includes the following steps:

Step 401: The network side device determines that the data in the compressed cache is out of synchronization with the data in the terminal compression cache.

Step 402: The network side device generates a PDCP status report for indicating redundant data in the compression buffer according to the compressed data that cannot be correctly transmitted.

Step 403: The network side device sends a PDCP status report to the terminal.

Step 404: After receiving the PDCP status report, the terminal deletes the redundant data in the compressed cache according to the PDCP status report, and then ends the process.

According to the UDC technology, when the terminal sends compressed uplink data to the network side device, the terminal updates the data in the compressed cache, and the uplink data transmission fails (for example, the network side device does not receive the data packet corresponding to the serial number sent by the terminal). The data in the compression buffer of the network side device will not be updated in time. In this case, the compressed data of the terminal and the network side device may be out of synchronization.

For this situation, according to the method for performing data synchronization as shown in FIG. 4, after determining that the uplink data transmission fails, the network side device in the embodiment of the present invention can generate a PDCP status report for indicating uplink data of the transmission failure. The PDCP status report may include a sequence number of the data packet that the network side device fails to receive, or a sequence number of the lost data packet. After receiving the PDCP status report, the terminal may report the uplink data packet that fails to be transmitted according to the PDCP status report. The serial number deletes the redundant data in the compression buffer corresponding to the data packet, so that the data in the compression cache of the terminal and the network side device can be restored.

As shown in FIG. 5, the third method for performing data synchronization provided by the embodiment of the present invention includes the following steps:

Step 501: The network side device determines that the data in the compression cache is out of synchronization with the data in the terminal compression cache.

Step 502: The network side device sends, to the terminal, indication information indicating that the cache is out of synchronization.

Step 503: After receiving the indication information, the terminal sends the data in the compression buffer to the network side device.

Step 504: After receiving the data in the compressed cache sent by the terminal, the network side device uses the data in the compressed cache as the data in the compressed cache, and then ends the process.

According to the method for performing data synchronization as shown in FIG. 5, after the network side device determines that the data for performing decompression is not synchronized with the data for performing compression of the terminal, the indication information may be used to instruct the terminal to compress the data in the cache. Send to the network side device.

The network side device may send the indication information to the terminal by using the RRC message or the newly created MAC control unit (for example, the new Flush UDC buffer MAC CE), and the uplink information is carried in the indication information to indicate that the terminal reports the data in the compression buffer. Or compressing the cache index list; the terminal may also apply for the uplink scheduling authorization to the network side device after receiving the indication information sent by the network side device.

The terminal may encapsulate the data in the compressed buffer that needs to be sent into a PDCP PDU (Protocol Data Unit), and send the data in the encapsulated compressed cache to the network side device. The terminal may encapsulate the quantity information of the encapsulated PDCP PDU into a PDCP PDU and send it to the network side device, or indicate the quantity information of the encapsulated PDCP PDU in the last PDCP PDU encapsulated.

The network side device may instruct the terminal to report the data in the compressed cache by using the RRC message or the newly created MAC control unit. After receiving the data in the compressed cache reported by the terminal, the network side device may use the data as the data in the cache. Synchronization of data in the data domain network side device compression cache in the terminal compression cache is implemented. For example, when the total amount of data in the compression buffer of the terminal is small (for example, less than 64 KB), all data in the compression buffer of the terminal may be sent to the network side device.

As shown in FIG. 6, the fourth method for performing data synchronization provided by the embodiment of the present invention includes the following steps:

Step 601: The terminal determines that an RRC connection establishment is required.

Step 602: The terminal sends an RRC message carrying the data in the terminal compression buffer to the network side device.

Step 603: After receiving the data in the compressed cache, the network side device uses the data in the compressed cache as the data in the compressed cache.

Step 604: After the network side device uses the data in the compressed buffer as the data in the compressed cache, the network side device sends an acknowledgement message to the terminal.

Step 605: After receiving the acknowledgement message sent by the network side device, the terminal confirms that the data in the compressed cache is correctly received by the network side, and then ends the process.

The data for performing compression of the terminal and the data for decompressing of the network side device may be asynchronous when the terminal and the network side device perform RRC connection establishment (including RRC connection establishment and RRC connection re-establishment). . At this time, according to the method for performing data synchronization as shown in FIG. 6, the terminal may carry its own data for compression in the RRC message sent to the network side device in the process of performing the RRC connection establishment, and the network side device is in the network side device. After receiving the data in the compression buffer of the terminal, the data can be used as the data in the compression cache of the terminal, so that the data in the compression buffer of the terminal and the network side device can be synchronized.

After the network side device uses the data in the compressed cache as the data in the compressed cache, the device may send an acknowledgement message to the terminal, so that the terminal determines that the network side device correctly receives the data in the compressed cache. After determining that the network side device correctly receives the data in the compression buffer, the terminal may start transmitting the uplink compressed data.

As shown in FIG. 7, the fifth method for performing data synchronization provided by the embodiment of the present invention includes the following steps:

Step 701: The network side device determines that the compressed cache index list is not synchronized with the compressed cache index list of the terminal.

Step 702: The network side device sends, to the terminal, indication information indicating that the cache is out of synchronization.

Step 703: After receiving the indication information, the terminal sends the compressed cache index list to the network side device.

Step 704: After receiving the compressed cache index list sent by the terminal, the network side device uses the received compressed cache index list as its own compressed cache index list, and then ends the process.

According to the method for performing data synchronization as shown in FIG. 7, after the compressed cache index list of the network side device is not synchronized with the compressed cache index list of the terminal, the indication information may be used to instruct the terminal to send the compressed cache index list to the network side device. After receiving the compressed cache index list, the network side device uses the compressed cache index list to decompress the compressed data, so that the compression cache index list of the terminal and the compressed cache index list of the network side device are synchronized.

As shown in FIG. 8, the sixth method for performing data synchronization provided by the embodiment of the present invention includes the following steps:

Step 801: The terminal determines that an RRC connection setup needs to be performed.

Step 802: The terminal sends an RRC message carrying the terminal compression cache index list to the network side device.

Step 803: After receiving the compressed cache index list, the network side device uses the received compressed cache index list as a compressed cache index list used for decompression.

Step 804: After the network-side device uses the compressed cache index list as the compressed cache index list for decompression, the network side device sends an acknowledgement message to the terminal.

Step 805: After receiving the acknowledgement message sent by the network side device, the terminal confirms that the compressed cache index list is correctly received by the network side, and then ends the process.

The compressed cache index list of the terminal and the compressed cache index list of the network side device may be asynchronous when the RRC connection establishment or re-establishment is performed. Therefore, the terminal may perform the RRC connection establishment process according to the method shown in FIG. Sending, by the RRC message, the compressed cache index list used by the terminal to the network side device, after receiving the compressed cache index list sent by the terminal, the network side device may use the compressed cache index list to decompress the compressed data, thereby implementing the terminal and the Synchronization of the compressed cache index list of the network side device.

After the network side device uses the data in the compressed cache as the compressed cache index list for decompression, the network device may send an acknowledgement message to the terminal, so that the terminal determines that the network side device correctly receives the compressed cache index list. After determining that the network side device correctly receives the compressed cache index list, the terminal may start transmitting the uplink compressed data.

As shown in FIG. 9, the terminal for performing data synchronization according to the embodiment of the present invention includes: a first determining module 901, configured to determine data used by the terminal for compression and data used by the network side device to perform decompression. The first processing module 902 is configured to process data used by the terminal for compression, so that the data used by the terminal for compression is synchronized with the data used by the network side device for decompression.

Optionally, the first determining module 901 is specifically configured to: if receiving the indication information indicating that the cache is out of synchronization sent by the network side device, or performing an RRC connection establishment with the network side device, determining the data and the network used by the terminal for compression The data used by the side device for decompression is not synchronized.

Optionally, the first determining module 901 is specifically configured to: receive, by using an RRC reconfiguration message or a MAC control unit, indication information indicating that the cache is out of synchronization.

Optionally, the data used for compression is data in the compression cache; the first processing module 902 is specifically configured to: delete redundant data in the compression cache according to the PDCP status report.

Optionally, the data used for compression is the data in the compressed cache; the first processing module 902 is specifically configured to: clear the data in the compressed cache; or send the data in the compressed cache to the network side device.

Optionally, the first processing module 902 is specifically configured to: send the data in the compression buffer to the network side device by using a user plane, or send the data in the compression buffer to the network side device by using a control plane RRC message.

Optionally, the data used for compression is a compressed cache index list; the first processing module 902 is specifically configured to: notify a list of compressed cache indexes used by the network side device.

Optionally, the first processing module 902 is specifically configured to: notify, by using the RRC message, the terminal to notify the compressed cache index list used by the network side device.

As shown in FIG. 10, the first network side device for performing data synchronization according to the embodiment of the present invention includes: a second determining module 1001, configured to determine data used for decompression and data used by the terminal for compression. The second processing module 1002 is configured to process the data used for decompression, so that the data used by the network side device for decompression is synchronized with the data used by the terminal for compression.

Optionally, the second determining module 1001 is specifically configured to: if it is determined that the abnormal condition is met, determine that the data used for performing decompression is out of synchronization with the data used by the terminal for compression; wherein the abnormal condition includes some or all of the following The verification of the cache check bit carried in the compressed data sent by the terminal fails; the demodulation of the compressed data sent by the terminal fails; the radio link fails; the RRC connection establishment with the terminal is required.

Optionally, the second processing module 1002 is specifically configured to: clear data in the compressed cache, and send indication information indicating that the cache is out of synchronization to the terminal, so that the terminal clears the data in the compressed cache; or compresses the received terminal. The data in the cache replaces the data in the compression buffer of the network side device; or sends a PDCP status report to the terminal, so that the terminal deletes the redundant data in the compressed cache.

Optionally, the second processing module 1002 is further configured to: after determining that the data used for performing decompression is not synchronized with the data used by the terminal for performing compression, send indication information indicating that the cache is out of synchronization to the terminal; The data in the compression cache replaces the data in the compression cache of the network side device.

Optionally, the second processing module 1002 is specifically configured to: receive data in the compressed cache of the terminal by using an RRC message.

Optionally, the data used for decompression is a compressed cache index list; the second processing module 1002 is specifically configured to: determine, according to the notification of the terminal, a compressed cache index list used by the terminal.

Optionally, the second processing module 1002 is further configured to: after determining that the data for performing decompression is not synchronized with the data used by the terminal for performing compression, sending, to the terminal, indication information indicating that the cache is out of synchronization; determining, according to the notification of the terminal, A list of compressed cache indexes used by the terminal.

Optionally, the second processing module 1002 is specifically configured to: receive, by using an RRC message, a notification of the terminal.

Optionally, the second processing module 1002 is specifically configured to: send, by using an RRC reconfiguration message or a MAC control unit, indication information indicating that the cache is out of synchronization.

As shown in FIG. 11, the second data synchronization terminal of the embodiment of the present invention includes: a processor 1101, configured to read a program in the memory 1104, and perform the following process: determining data and network used by the terminal for compression. The data used by the side device for decompressing is not synchronized; the data used by the terminal for compression is processed, so that the data used by the terminal for compression is synchronized with the data used by the network side device for decompression; the transceiver 1102 is used. Data is received and transmitted under the control of the processor 1101.

Optionally, the processor 1101 is configured to: after receiving, by the transceiver 1102, the indication information indicating that the cache is out of synchronization sent by the network side device, or the RRC connection establishment with the network side device, determining the data used by the terminal for compression The data used by the network side device for decompression is not synchronized.

Optionally, the processor 1101 is specifically configured to: receive, by using the RRC reconfiguration message or the MAC control unit, the indication information indicating that the cache is out of synchronization by using the transceiver 1102.

Optionally, the data used for compression is the data in the compressed cache; the processor 1101 is specifically configured to: delete the redundant data in the compressed cache according to the PDCP status report.

Optionally, the data used for compression is the data in the compressed cache; the processor 1101 is specifically configured to: clear the data in the compressed cache; or send the data in the compressed cache to the network side device.

Optionally, the processor 1101 is specifically configured to: send, by using the transceiver 1102, data in the compression buffer to the network side device through the user plane, or send the data in the compression buffer to the network side through the transceiver 1102 by using a control plane RRC message. device.

Optionally, the data used for compression is a compressed cache index list; the processor 1101 is specifically configured to: notify, by the transceiver 1102, a compressed cache index list used by the network side device.

Optionally, the processor 1101 is specifically configured to: notify, by the transceiver 1102, the compressed cache index list used by the network side device by using the RRC message.

In FIG. 11, a bus architecture (represented by bus 1100), bus 1100 can include any number of interconnected buses and bridges, and bus 1100 will include one or more processors and memory 1104 represented by general purpose processor 1101. The various circuits of the memory are linked together. The bus 1100 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein. Bus interface 1103 provides an interface between bus 1100 and transceiver 1102. The transceiver 1102 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, transceiver 1102 receives external data from other devices. The transceiver 1102 is configured to send the processed data of the processor 1101 to other devices. Depending on the nature of the computing system, a user interface 1105 can also be provided, such as a keypad, display, speaker, microphone, joystick.

The processor 1101 is responsible for managing the bus 1100 and the usual processing, such as running a general purpose operating system as described above. The memory 1104 can be used to store data used by the processor 1101 when performing operations.

Optionally, the processor 1101 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD ( Complex Programmable Logic Device, Complex Programmable Logic Device).

As shown in FIG. 12, a second network side device for performing data synchronization according to an embodiment of the present invention includes: a processor 1201 for reading a program in the memory 1204, and performing the following process: determining for performing a solution. The compressed data is not synchronized with the data used by the terminal for compression; and is used for processing the data used for decompression, so that the data used by the network side device for decompressing is synchronized with the data used by the terminal for compression; The machine 1202 is configured to receive and transmit data under the control of the processor 1201.

Optionally, the processor 1201 is specifically configured to: if it is determined that the abnormal condition is met, determine that the data used for performing decompression is out of synchronization with the data used by the terminal for compression; wherein the abnormal condition includes some or all of the following: The buffer check bit verification carried in the compressed data sent by the terminal fails; the demodulation of the compressed data sent by the terminal fails; the radio link fails; the RRC connection establishment with the terminal is required.

Optionally, the data used for decompressing is the data in the compressed cache. The processor 1201 is specifically configured to: clear the data in the compressed cache, and send, by the transceiver 1202, indication information indicating that the cache is out of synchronization, to the terminal, so that The terminal clears the data in the compression buffer; or replaces the data in the compression buffer of the terminal received by the transceiver 1202 with the data in the compression buffer of the network side device; or sends the PDCP status report to the terminal through the transceiver 1202, so that the terminal Delete redundant data in the compression cache.

Optionally, the processor 1201 is specifically configured to: after determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, transmitting, by the transceiver 1202, indication information indicating that the cache is out of synchronization is sent to the terminal; The data in the compression buffer of the terminal received by the machine 1202 replaces the data in the compression buffer of the network side device.

Optionally, the processor 1201 is specifically configured to: receive, by using the RRC message, the data in the compressed cache of the terminal by the transceiver 1202.

Optionally, the data used for decompression is a compressed cache index list; the processor 1201 is specifically configured to: determine, according to the notification of the terminal, a compressed cache index list used by the terminal.

Optionally, the processor 1201 is specifically configured to: after determining that the data used for performing decompression is not synchronized with the data used by the terminal for performing compression, sending, by the transceiver 1202, indication information indicating that the cache is out of synchronization is sent to the terminal; The notification determines the list of compressed cache indexes used by the terminal.

Optionally, the processor 1201 is specifically configured to: receive, by using the transceiver 1202, a notification of the terminal by using an RRC message.

Optionally, the processor 1201 is specifically configured to: send, by the transceiver 1202, indication information indicating that the cache is out of synchronization, by using an RRC reconfiguration message or a MAC control unit.

In FIG. 12, a bus architecture (represented by bus 1200), bus 1200 can include any number of interconnected buses and bridges, and bus 1200 will include one or more processors represented by processor 1201 and memory represented by memory 1204. The various circuits are linked together. The bus 1200 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. Bus interface 1203 provides an interface between bus 1200 and transceiver 1202. Transceiver 1202 may be an element or multiple elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium. Data processed by processor 1201 is transmitted over wireless medium via antenna 1205. Further, antenna 1205 also receives data and transmits the data to processor 1201.

The processor 1201 is responsible for managing the bus 1200 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 1204 can be used to store data used by the processor 1201 in performing operations.

Optionally, the processor 1201 may be a CPU, an ASIC, an FPGA, or a CPLD.

The embodiment of the present invention further provides a computer storage medium storing computer executable instructions for causing the computer to execute the method on the terminal side.

Embodiments of the present invention also provide a computer storage medium storing computer executable instructions for causing the computer to perform the method performed by the base station side.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method for performing data synchronization, the method comprising:

Determining, by the terminal, that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression;

The terminal processes the data used by the terminal for compression, so that the data used by the terminal for compression is synchronized with the data used by the network side device for decompression.
The method according to claim 1, wherein the terminal determines that the data used by the terminal for compression is not synchronized with the data used by the network side device for decompression, and includes:

If the terminal receives the indication information indicating that the cache is out of synchronization sent by the network side device, or needs to perform radio resource control RRC connection establishment with the network side device, determine the data used by the terminal for compression and the network side. The data that the device uses for decompression is out of sync.
The method according to claim 2, wherein the terminal receives the indication information indicating that the cache is out of synchronization through an RRC reconfiguration message or a medium access control MAC control unit.
The method of claim 2, wherein the indication information indicating that the cache is out of synchronization is a packet data convergence protocol PDCP status report.
The method of claim 4, wherein the data for compression is data in a compression cache;

The terminal processes the data used by the terminal for compression, including:

The terminal deletes redundant data in the compression cache according to the PDCP status report.
The method according to any one of claims 1 to 4, wherein the data for performing compression is data in a compression buffer;

The terminal processes the data used by the terminal for compression, including:

The terminal clears data in the compressed cache; or

The terminal sends the data in the compressed cache to the network side device.
The method of claim 6, wherein the terminal sends the data in the compressed cache to the network side device, including:

The terminal sends the data in the compression buffer to the network side device through the user plane, or sends the data in the compression buffer to the network side device by using a control plane RRC message.
The method according to any one of claims 1 to 4, wherein the data for performing compression is a compressed cache index list;

The terminal processes the data used by the terminal for compression, including:

The terminal notifies the compressed cache index list used by the network side device.
The method according to claim 8, wherein the terminal notifying the compression cache index list used by the network side device comprises:

The terminal notifies the compressed cache index list used by the network side device by using an RRC message.
A method for performing data synchronization, the method comprising:

The network side device determines that the data used for decompression is not synchronized with the data used by the terminal for compression;

The network side device processes the data used for decompression, so that the data used by the network side device for performing decompression is synchronized with the data used by the terminal for compression.
The method according to claim 10, wherein the network side device determines that the data for performing decompression is out of synchronization with the data used by the terminal for compression, and includes:

If the network side device determines that the abnormal condition is met, determining that the data used for performing decompression is not synchronized with the data used by the terminal for compression;

Wherein, the abnormal condition includes some or all of the following:

The cache check bit verification carried in the compressed data sent by the terminal fails;

Demodulating the compressed data sent by the terminal fails;

The wireless link has failed;

A radio resource control RRC connection setup is required with the terminal.
The method of claim 10, wherein the data for performing decompression is data in a compression cache;

The network side device processes data used for decompression, including:

The network side device clears data in the compressed cache, and sends indication information indicating that the cache is out of synchronization to the terminal, so that the terminal clears the data in the compressed cache; or

The network side device replaces data in the compression buffer of the network side device with the received data in the compressed cache of the terminal; or

The network side device sends a packet data convergence protocol PDCP status report to the terminal, so that the terminal deletes redundant data in the compression buffer.
The method according to claim 12, wherein the network side device determines that the data for performing decompression is not synchronized with the data used by the terminal for compression, and is used in the compressed cache of the received terminal. Before the data is replaced by the data in the compression buffer of the network side device, the method further includes:

The network side device sends indication information indicating that the cache is out of synchronization to the terminal.
The method of claim 12, wherein the network side device receives data in the compressed cache of the terminal through an RRC message.
The method according to claim 10, wherein said data for performing decompression is a compressed cache index list;

The network side device processes data used for decompression, including:

The network side device determines, according to the notification of the terminal, a compressed cache index list used by the terminal.
The method according to claim 15, wherein the network side device determines that the data for performing decompression is not synchronized with the data used by the terminal for compression, and determines the use of the terminal according to the notification of the terminal. Before the compressed cache index list, the method further includes:

The network side device sends indication information indicating that the cache is out of synchronization to the terminal.
The method according to claim 15, wherein the network side device receives the notification of the terminal by using an RRC message.
The method according to any one of claims 12 to 14 and 16, wherein the network side device sends the indication information indicating that the cache is out of synchronization to the terminal, including:

And the network side device sends, to the terminal, indication information indicating that the cache is out of synchronization, by using an RRC reconfiguration message or a media access control MAC control unit.
A terminal for performing data synchronization, characterized in that the terminal comprises:

a first determining module, configured to determine that data used by the terminal for compression is not synchronized with data used by the network side device for decompression;

The first processing module is configured to process data used by the terminal for compression, so that data used by the terminal for compression is synchronized with data used by the network side device for decompression.
The terminal according to claim 19, wherein the first determining module is specifically configured to:

Determining, by the network side device, the data used by the terminal for performing compression and the network side device, if receiving the indication information indicating that the cache is out of synchronization sent by the network side device, or performing the radio resource control RRC connection establishment with the network side device, The decompressed data is out of sync.
The terminal according to claim 20, wherein the first determining module is specifically configured to:

The indication information indicating that the cache is out of synchronization is received by an RRC reconfiguration message or a medium access control MAC control unit.
The terminal according to claim 20, wherein the indication information indicating that the cache is out of synchronization is a packet data convergence protocol PDCP status report.
The terminal according to claim 22, wherein said data for performing compression is data in a compression buffer;

The first processing module is specifically configured to:

According to the PDCP status report, redundant data in the compression cache is deleted.
The terminal according to any one of claims 19 to 22, wherein the data for performing compression is data in a compression buffer;

The first processing module is specifically configured to:

Empty the data in the compressed cache; or

Sending data in the compressed cache to the network side device.
The terminal according to claim 24, wherein the first processing module is specifically configured to:

The data in the compressed cache is sent to the network side device by the user plane, or the data in the compressed cache is sent to the network side device by using a control plane RRC message.
The terminal according to any one of claims 19 to 22, wherein the data for performing compression is a compressed cache index list;

The first processing module is specifically configured to:

Notifying the compressed cache index list used by the network side device.
The terminal according to claim 26, wherein the first processing module is specifically configured to:

The terminal notifies the compressed cache index list used by the network side device by using an RRC message.
A network side device for performing data synchronization, the method comprising:

a second determining module, configured to determine that data used for performing decompression is out of synchronization with data used by the terminal for compression;

And a second processing module, configured to process data used for decompressing, so that the data used by the network side device to perform decompression is synchronized with the data used by the terminal for compression.
The network side device according to claim 28, wherein the second determining module is specifically configured to:

If it is determined that the abnormal condition is satisfied, it is determined that the data used for decompression is not synchronized with the data used by the terminal for compression;

Wherein, the abnormal condition includes some or all of the following:

The cache check bit verification carried in the compressed data sent by the terminal fails to be read;

Demodulating the compressed data sent by the terminal fails;

The wireless link has failed;

A radio resource control RRC connection setup is required with the terminal.
The network side device according to claim 28, wherein the data for performing decompression is data in a compression buffer;

The second processing module is specifically configured to:

Clearing the data in the compressed cache, and sending indication information indicating that the cache is out of synchronization to the terminal, so that the terminal clears the data in the compressed cache; or

Replacing the data in the compression buffer of the network side device with the received data in the compression cache of the terminal; or

Sending a PDCP status report to the terminal to cause the terminal to delete redundant data in the compression buffer.
The network side device according to claim 30, wherein the second processing module is further configured to:

After determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, transmitting, to the terminal, indication information indicating that the cache is out of synchronization;

Replacing data in the compression buffer of the network side device with the received data in the compression cache of the terminal.
The network side device according to claim 30, wherein the second processing module is specifically configured to:

The data in the compressed cache of the terminal is received through an RRC message.
The network side device according to claim 28, wherein the data for performing decompression is a compressed cache index list;

The second processing module is specifically configured to:

Determining, according to the notification of the terminal, the compressed cache index list used by the terminal.
The network side device according to claim 33, wherein the second processing module is further configured to:

After determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, transmitting, to the terminal, indication information indicating that the cache is out of synchronization;

Determining, according to the notification of the terminal, the compressed cache index list used by the terminal.
The network side device according to claim 33, wherein the second processing module is specifically configured to:

The notification of the terminal is received through an RRC message.
The network side device according to any one of claims 30 to 32 and 34, wherein the second processing module is specifically configured to:

The indication information indicating that the cache is out of synchronization is sent to the terminal by the RRC reconfiguration message or the medium access control MAC control unit.
A terminal, comprising: a processor, a transceiver, and a memory;

The processor is configured to read a program in the memory, and perform the following process: determining that data used by the terminal for compression is not synchronized with data used by the network side device for decompression, and is used by the terminal The compressed data is processed, so that the data used by the terminal for compression is synchronized with the data used by the network side device for decompression;

The transceiver is configured to receive and transmit data under the control of the processor.
The terminal according to claim 37, wherein the processor is specifically configured to:

Determining, by the transceiver, the indication information indicating that the cache is out of synchronization sent by the network side device or performing the radio resource control RRC connection establishment with the network side device, determining the data used by the terminal for compression The data used by the network side device for decompression is not synchronized.
The terminal according to claim 38, wherein the processor is specifically configured to:

The indication information indicating that the cache is out of synchronization is received by an RRC reconfiguration message or a medium access control MAC control unit.
The terminal according to claim 38, wherein said indication information indicating that the cache is out of synchronization is a packet data convergence protocol PDCP status report.
The terminal according to claim 40, wherein said data for performing compression is data in a compression buffer;

The processor is specifically configured to:

According to the PDCP status report, redundant data in the compression cache is deleted.
The terminal according to any one of claims 37 to 40, wherein the data for performing compression is data in a compression buffer;

The processor is specifically configured to:

Empty the data in the compressed cache; or

Sending data in the compressed cache to the network side device.
The terminal according to claim 42, wherein the processor is specifically configured to:

The data in the compressed cache is sent to the network side device by the user plane, or the data in the compressed cache is sent to the network side device by using a control plane RRC message.
The terminal according to any one of claims 37 to 40, wherein the data for performing compression is a compressed cache index list;

The processor is specifically configured to:

Notifying the compressed cache index list used by the network side device by the transceiver.
The terminal according to claim 44, wherein the processor is specifically configured to:

Notifying the compressed cache index list used by the network side device by using an RRC message.
A network side device, comprising: a processor, a transceiver, and a memory;

The processor is configured to read a program in the memory, and perform the following process: determining that data for performing decompression is out of synchronization with data used by the terminal for compression, and processing data for performing decompression, Synchronizing data used by the network side device for decompression with data used by the terminal for compression;

The transceiver is configured to receive and transmit data under the control of the processor.
The network side device according to claim 46, wherein the processor is specifically configured to:

If it is determined that the abnormal condition is satisfied, it is determined that the data used for decompression is not synchronized with the data used by the terminal for compression;

Wherein, the abnormal condition includes some or all of the following:

The cache check bit verification carried in the compressed data sent by the terminal fails;

Demodulating the compressed data sent by the terminal fails;

The wireless link has failed;

A radio resource control RRC connection setup is required with the terminal.
The network side device according to claim 46, wherein the data for performing decompression is data in a compression buffer;

The processor is specifically configured to:

Clearing data in the compression buffer, and transmitting, by the transceiver, indication information indicating that the cache is out of synchronization to the terminal, so that the terminal clears data in the compression cache; or

Replacing the data in the compression buffer of the network side device with the received data in the compression cache of the terminal; or

Transmitting, by the transceiver, a packet data convergence protocol PDCP status report to the terminal, so that the terminal deletes redundant data in the compression buffer.
The network side device according to claim 48, wherein the processor is further configured to:

After determining that the data for performing decompression is not synchronized with the data used by the terminal for compression, before replacing the data in the compression buffer of the network side device with the data in the compressed cache of the received terminal, The transceiver sends indication information indicating that the cache is out of synchronization to the terminal.
The network side device according to claim 48, wherein the processor is specifically configured to:

The data in the compressed cache of the terminal is received through an RRC message.
The network side device according to claim 46, wherein the data for performing decompression is a compressed cache index list;

The processor is specifically configured to:

Determining, according to the notification of the terminal, a compressed cache index list used by the terminal.
The network side device according to claim 51, wherein the processor is further configured to:

Determining, after the data for performing decompression is not synchronized with the data used by the terminal for compression, sending, by the transceiver, the terminal to the terminal before determining the compressed cache index list used by the terminal according to the notification of the terminal Indicates that the cache is out of sync.
The network side device according to claim 51, wherein the processor is specifically configured to:

The notification of the terminal is received through an RRC message.
The network side device according to any one of claims 48 to 50 and 52, wherein the processor is specifically configured to:

The indication information indicating that the cache is out of synchronization is sent to the terminal by the RRC reconfiguration message or the medium access control MAC control unit.
A computer storage medium, characterized in that the computer readable storage medium stores computer executable instructions for causing the computer to perform the method of any one of claims 1-9 .
A computer storage medium, characterized in that the computer readable storage medium stores computer executable instructions for causing the computer to perform the method of any one of claims 10-18 .