CN104518851A - Method and device for data processing - Google Patents

Method and device for data processing Download PDF

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Publication number
CN104518851A
CN104518851A CN201310452437.4A CN201310452437A CN104518851A CN 104518851 A CN104518851 A CN 104518851A CN 201310452437 A CN201310452437 A CN 201310452437A CN 104518851 A CN104518851 A CN 104518851A
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China
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described
pdcp
pdcp sdu
sdu
opposite end
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CN201310452437.4A
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Chinese (zh)
Inventor
王达菲
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中兴通讯股份有限公司
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Priority to CN201310452437.4A priority Critical patent/CN104518851A/en
Publication of CN104518851A publication Critical patent/CN104518851A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02Data link layer protocols

Abstract

The invention discloses a method for data processing. The method comprises: when a PDCP service data unit (SDU) sent to an opposite end is confirmed by a state report from the opposite end, and the PDCP SDU exists a PDCP protocol data unit (PDU) corresponding to the PDCP SDU is determined, not giving up the PDCP SDU and the PDCP SDU corresponding to the PDCP SDU. The invention also discloses a data processing device. Using the technical scheme, correct uncompressing on messages by a decompressor on a PDCP receiving end is ensured, so as to ensure correct processing of the messages, and bandwidth is saved.

Description

A kind of data processing method and device

Technical field

The present invention relates to data processing technique, particularly relate to data processing method and the device of a kind of PDCP (PDCP, PacketData Convergence Protocol) layer.

Background technology

At third generation partnership project (3GPP, Third Generation Partnership Projects) and 3GPP Long Term Evolution (LTE, Long Term Evolution) in system, at subscriber equipment (UE, UserEquipment) and the air interface protocols of base station (eNB, evolved NodeB) there is PDCP layer.Fig. 1 is the LTE user face protocol stack schematic diagram of correlation technique, as shown in Figure 1, LTE user face protocol stack comprises PDCP, wireless spread-spectrum technology (RLC, Radio Link Control), medium education (MAC, Medium Access Control), physical layer (PHY, Physical Layer).Wherein, PDCP layer is that high-level user face data such as User IP grouping bag or chain of command data such as wireless heterogeneous networks (RRC, RadioResource Control) message provide data convergence service.

Fig. 2 is the structural representation of the PDCP entity function of correlation technique, and as shown in Figure 2, described PDCP entity comprises PDCP transmitting terminal and PDCP receiving terminal.The major function of PDCP entity comprises: for user face (u-plane) data provide Header compression (Header Compression) and packet header decompression (HeaderDecompression) function; For user face and chain of command (c-plane) data provide encryption (Ciphering) and deciphering (Deciphering) function; For chain of command data provide data consistency to protect (IntegrityProtection) and consistency check (Integrity Verification) function; Transmit (Sequence numbering) and (Re-ordering) function that reorders when switching according to the order of sequence for high level data provides, and realize switching (Lossless Handover) without packet loss.PDCP transmitting terminal can be also that PDCP service data unit (SDU, Service Data Unit) distributes a sequence number (SN, Sequence Number), and for indicating the sending order of each PDCP SDU, this SN is called PDCP SN.

From high level in the transport process of low layer, the PDCP SDU received is carried out head compression, encrypts, adds that PDCP capitiform becomes PDCP protocol Data Unit (PDU, Protocol DataUnit) by PDCP transmitting terminal successively, is sent to rlc layer.And in the transport process from low layer to high level, the PDCP PDU solution received is gone PDCP head, deciphering, decompression by PDCP receiving terminal successively, the SDU forming PDCP sends.

Usually, PDCP transmitting terminal has and abandons (PDCP Discard) function, namely when PDCP SDU abandon timer (Discard Timer) time-out, or, to opposite end send PDCP SDU confirm by the status report (Status Report) from opposite end time, this PDCP SDU can abandon by PDCP transmitting terminal, and is abandoned by the PDCP PDU of its correspondence.Further, if this PDCP PDU has been sent to rlc layer, what so PDCP will send this PDCP PDU to RLC has abandoned instruction.This discard of PDCP transmitting terminal makes the decompression machine of PDCP receiving terminal there is failed possibility in decompression process.

Such as: suppose that PDCP transmitting terminal will send the PDCP SDU that PDCP SN is 1 to 20, PDCPSN is the RTP (RTP that is corresponding in turn to of PDCP SDU of 1 to 20, Real-time TransportProtocol) SN in stem is 1 to 20, suppose that PDCP transmitting terminal first sends 3 messages that PDCP SN is 1 to 3, and compressor reducer in PDCP transmitting terminal uses the compression efficiency of SN to reach the maximum compressed packet containing 4bit SN field to compress, so the binary representation of 3 is 0011; Suppose again PDCPSN be 1 to 33 messages successfully received and successful decompression by PDCP receiving terminal, at this moment, in PDCP receiving terminal, the reference value of decompression machine is updated to 3; Then, the compressor reducer in PDCP transmitting terminal can be by PDCPSN 4 to 20 PDCP SDU all use the compressed packet of 4bit SN field carry out compression process.Now, be dropped if PDCP SN is 4 to 19 these 16 PDCP SDU, but the compressor reducer in PDCP transmitting terminal do not know that PDCP Discard occurs, can continue to carry out compression process according to compression method before, namely continue the compressed packet transmitting 4bit SN; For the PDCP SDU that PDCP SN is 20, because the SN in the RTP stem of its correspondence is 20, binary representation due to 20 is 10100, so compressor reducer only sends low 4bit to decompression machine, decompression machine is sent to by 0100, because decompression machine cannot receive the message of PDCP SN from 4 to 19, so the reference value of decompression machine is maintained 3, corresponding binary system is 0011; When to have received PDCP SN be the message of 20 to decompression machine, use 0100 to reduce on the basis of reference value 0011, obtaining SN is 0100, and namely SN is 4, and this and the SN transmitted are 20 is inconsistent, causes de-compression failure.

Why there are the problems referred to above, be that compressor reducer is failed consistent with the process of decompression machine to message, namely the decompression machine message that should obtain abandon by the discard of compression end, and then result in decompression machine cannot correct maintenance in order to the reference value decompressed, finally make de-compression failure.After de-compression failure, compressor reducer and decompression machine all can initiate a series of reparation flow process, add mutual data volume of eating dishes without rice or wine, cause bandwidth waste.

Summary of the invention

In view of this, the main purpose of the embodiment of the present invention is to provide a kind of data processing method and device, can ensure the correct decompressed of decompression machine to message of PDCP receiving terminal, thus ensure that the correct process of message, and then saves bandwidth.

For achieving the above object, technical scheme of the present invention is achieved in that

Embodiments provide a kind of data processing method, described method comprises: when the PDCP service data unit SDU sent to opposite end is confirmed by the status report from opposite end, and when determining that described PDCPSDU exists the PDCP protocol Data Unit PDU corresponding with described PDCP SDU, do not abandon described PDCP SDU and the PDCP PDU corresponding with described PDCP SDU.

Preferably, described method also comprises: compress described PDCP SDU and be sent to described opposite end.

Preferably, described method also comprises: network side transmits information structuring status report according to the sequence number state of described PDCP SDU to be sent, and described status report is sent to described opposite end; Accordingly, described PDCP SDU is confirmed by the status report from opposite end, comprising: receive the described status report that described opposite end sends, and determine the PDCP SDU that described status report is corresponding, determined PDCP SDU is confirmed by described status report.

Preferably, described method also comprises: when the PDCP SDU sent to opposite end is confirmed by the status report from opposite end, and when determining that described PDCP SDU does not exist the PDCPPDU corresponding with described PDCP SDU, abandon described PDCP SDU.

Preferably, described method also comprises: described PDCP SDU abandon timer expiry time, abandon described PDCP SDU.

The embodiment of the present invention additionally provides a kind of data processing equipment, described device comprises the first determining unit and the first processing unit, wherein: described first determining unit, for when the PDCP service data unit SDU sent to opposite end confirm by the status report from opposite end time, judge whether described PDCP SDU exists the PDCP protocol Data Unit PDU corresponding with described PDCP SDU, when being, trigger described first processing unit; Described first processing unit, for not abandoning described PDCP SDU, and does not abandon the PDCP PDU corresponding with described PDCPSDU.

Preferably, described device also comprises transmitting element, for compressing described PDCP SDU and being sent to described opposite end.

Preferably, described device also comprises the second processing unit, when described first determining unit determines that described PDCPSDU does not exist the PDCP PDU corresponding with described PDCP SDU, triggers described second processing unit; Accordingly, described second processing unit, for abandoning described PDCP SDU.

Preferably, described device also comprises the second determining unit, for determine described PDCP SDU whether abandon timer overtime, when being, trigger described second processing unit; Described second processing unit, for abandoning described PDCP SDU.

A kind of data processing method that the embodiment of the present invention provides and device, when the PDCP service data unit SDU sent to opposite end is confirmed by the status report from opposite end, and when determining that described PDCP SDU exists the PDCP protocol Data Unit PDU corresponding with described PDCP SDU, do not abandon described PDCP SDU and the PDCP PDU corresponding with described PDCP SDU; So, ensure that the decompression machine of PDCP receiving terminal is to the correct decompressed of message, thus ensure that the correct process of message, and then save bandwidth.

Accompanying drawing explanation

Fig. 1 is the LTE user face protocol stack schematic diagram of correlation technique;

Fig. 2 is the structural representation of the PDCP entity function of correlation technique;

Fig. 3 is the realization flow schematic diagram of the embodiment of the present invention one data processing method;

Fig. 4 is the composition structural representation of the embodiment of the present invention three data processing equipment;

Fig. 5 is the composition structural representation of the embodiment of the present invention four data processing equipment;

Fig. 6 is the composition structural representation of the embodiment of the present invention five data processing equipment.

Embodiment

Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.

Embodiment one

Usually, PDCP transmitting terminal has discard, abandons timer expiry as PDCP SDU; Or, the PDCP SDU that PDCP transmitting terminal sends to opposite end confirm by the status report from opposite end time; This PDCP SDU can abandon by PDCP transmitting terminal, and is also abandoned by PDCP PDU corresponding for PDCP SDU.

The discard that PDCP transmitting terminal in the embodiment of the present invention has, also divides above-mentioned two situations, but has corresponding processing mode for each situation; Fig. 3 is the realization flow schematic diagram of the embodiment of the present invention one data processing method, and as shown in Figure 3, described data processing method comprises:

Step 301, PDCP SDU abandons timer expiry, enters step 302;

Step 302, abandons this PDCP SDU;

Step 303, the PDCP SDU sent to opposite end confirm by the status report from opposite end, progressive step 304;

Here, described opposite end can be PDCP receiving terminal;

Step 304, judges whether each PDCP SDU exists its corresponding PDCP PDU, when being, enters step 305; Otherwise, enter step 302;

Here, if this PDCP SDU is without PDCP process, then PDCP SDU does not have corresponding PDCP PDU; If this PDCP SDU is through the PDCP SDU of PDCP process, then PDCPSDU has corresponding PDCP PDU to exist.

Step 305, does not abandon this PDCP SDU and the PDCP PDU corresponding with it.

Embodiment two

When switching, for those to packet loss than more sensitive business as Record Carrier can ensure to switch without packet loss by exchanging PDCP status report in the PDCP inter-entity of UE and eNB.The embodiment of the present invention can ensure the correct decompressed of decompression machine to message of PDCP receiving terminal, and then ensure that the correct process of message.The journey switched for X2 is below described in detail.

Step 401, have PDCP SN 1 to 20 to have 20 PDCP SDU altogether and send in the transmission buffering area of PDCP transmitting terminal, the SN in the RTP stem that each PDCP SDU is corresponding is according to this 1 to 20;

Step 402, PDCP SN is the decompression machine being sent to PDCP receiving terminal after the message compression of 1 to 3 by the compressor reducer of PDCP transmitting terminal;

Step 403, after the decompression machine success decompress(ion) message of PDCP receiving terminal, the reference value of decompression is updated to 3, and corresponding binary system is 0011;

Step 404, PDCP transmitting terminal is the PDCP SDU process of 4 to 10 to PDCP SN, generates corresponding PDCP PDU, PDCP transmitting terminal be not also able to do in time to PDCP SN be 11 to 19 PDCP SDU process;

Step 405, PDCP SN be 4 to 11 PDCP SDU do not receive confirmation from bottom, rested on PDCP and send in buffering area, now PDCP transmitting terminal receives the status report sent from PDCP receiving terminal;

Here, described status report is determined like this, comprises the following steps: source eNB to send sequence number state transmission (SN Status Transfer) message to target eNB; The PDCP SN that described sequence number state transmits up count value (UL COUNT) correspondence of carrying in message is 1, and the bitmap (bitmap) carried is 00,1111,1111,1111,1111; And target eNB transmits message constructing status report according to described sequence number state, and described status report is sent to the PDCP receiving terminal of UE; Described status report is sent to PDCP transmitting terminal by PDCP receiving terminal.

Step 406, PDCP transmitting terminal determines whether abandon the PDCP SDU that PDCP SN is 4 to 19 according to the message bit pattern in status report:

Judge that PDCP SN is that the PDCP SDU of 4 to 10 is through PDCP process, thus PDCP PDU corresponding to PDCP SDU that PDCP SN is 4 to 10 exists, therefore, not to PDCP SN be 4 to 10 PDCP SDU and the PDCP PDU corresponding to PDCP SDU abandon;

Judge PDCP SN be the PDCP SDU of 11 to 19 without PDCP process, thus the PDCP SDU that PDCP SN is 11 to 19 does not have corresponding PDCP PDU, therefore, abandons the PDCP SDU that PDCP SN is 11 to 19;

Step 407, the decompression machine of PDCP receiving terminal receives the message that PDCP SN is 4 to 10, after its successful decompress(ion), and the reference value of decompression is updated to 10, and corresponding binary system is 1010;

Step 408, PDCP transmitting terminal by PDCP SN be 10 PDCP SDU distribute after, because PDCP SN is 11 to 19 is dropped, therefore, sending PDCP SN is the message of 20;

Be 10 because PDCP SN is SN in the RTP stem of the PDCP SDU of 10, PDCP SN is the SN in the RTP stem of the PDCP SDU of 20 is 20, according to compression algorithm, from 10 to 20 not more than the scope of 4bit, so only transmit the low 4bit that SN is 20, namely 0100;

Step 409, the decompression machine of PDCP receiving terminal receives the message that PDCP SN is 20, i.e. its low 4bit(0100) reduce by reference value 1010, obtaining SN is 10100, and namely SN is 20.

As can be seen from above-mentioned steps 401 to 411, in embodiments of the present invention, when the PDCP SDU that PDCP transmitting terminal sends to opposite end confirm by the status report from opposite end time, judge that whether this PDCPSDU is through PDCP process further; When determining without PDCP process, namely PDCP SDU does not have corresponding PDCP PDU, then abandoned by this PDCP SDU; Determine through PDCP process, namely PDCP SDU has corresponding PDCP PDU to exist, then do not abandon PDCP SDU, and does not also abandon PDCP PDU corresponding with it; So, the embodiment of the present invention can ensure the correct decompressed of decompression machine to message of PDCP receiving terminal, and then ensure that the correct process of message.

Embodiment three

Fig. 4 is the composition structural representation of the embodiment of the present invention three data processing equipment, and as shown in Figure 4, described data processing equipment is applied to PDCP layer, and described device comprises the first determining unit 41, first processing unit 42 and transmitting element 43, wherein:

Described first determining unit 41, the PDCP sent to opposite end for PDCP transmitting terminal take SDU confirm by the status report from opposite end time, judge whether described PDCP SDU exists the PDCP PDU corresponding with described PDCPSDU, when being, trigger described first processing unit;

Described first processing unit 42, for not abandoning described PDCP SDU and PDCPPDU corresponding thereto, triggers described transmitting element 43;

Described transmitting element 43, for compressing described PDCP SDU and being sent to described opposite end.

Embodiment four

Fig. 5 is the composition structural representation of the embodiment of the present invention four data processing equipment, as shown in Figure 5, described data processing equipment is applied to PDCP layer, and described device comprises the first determining unit 51, first processing unit 52, second processing unit 53 and transmitting element 54, wherein:

Described first determining unit 51, the PDCP SDU sent to opposite end for PDCP transmitting terminal confirm by the status report from opposite end time, judge whether described PDCP SDU exists the PDCP PDU corresponding with described PDCP SDU, when being, trigger described first processing unit 52, time no, trigger described second processing unit 53;

Described first processing unit 52, for not abandoning described PDCP SDU and PDCPPDU corresponding thereto, triggers described transmitting element 54;

Described second processing unit 53, for abandoning described PDCP SDU;

Described transmitting element 54, for compressing described PDCP SDU and being sent to described opposite end.

Embodiment five

Fig. 6 is the composition structural representation of the embodiment of the present invention five data processing equipment, as shown in Figure 6, described data processing equipment is applied to PDCP layer, described device comprises the first determining unit 61, first processing unit 62, transmitting element 63, second processing unit 64 and the second determining unit 65, wherein:

Described first determining unit 61, for when the PDCP SDU that PDCP transmitting terminal sends to opposite end confirm by the status report from opposite end time, and determine whether described PDCP SDU exists the PDCP PDU corresponding with described PDCPSDU; When being, trigger described first processing unit 62; Time no, trigger described second processing unit 64;

Described first processing unit 62, for not abandoning described PDCP SDU and PDCPPDU corresponding thereto, triggers described transmitting element 63;

Described transmitting element 63, for compressing described PDCP SDU and being sent to described opposite end;

Described second processing unit 64, for abandoning described PDCP SDU;

Described second determining unit 65, for determine described PDCP SDU whether abandon timer overtime, when being, trigger described second processing unit 64.

It will be understood by those of skill in the art that the practical function of each unit of data processing equipment of the present invention can refer to the associated description of aforementioned data processing method and understands.Those skilled in the art it is also understood that each unit of data processing equipment of the present invention realizes by the processor of described PDCP transmitting terminal, also realize by concrete logical circuit.Such as, in actual applications, can be realized by central processing unit (CPU), microprocessor (MPU), digital signal processor (DSP) or field programmable gate array (FPGA).

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (9)

1. a data processing method, is characterized in that, described method comprises:
When the PDCP service data unit SDU sent to opposite end is confirmed by the status report from opposite end, and when determining that described PDCP SDU exists the PDCP protocol Data Unit PDU corresponding with described PDCP SDU, do not abandon described PDCP SDU and the PDCP PDU corresponding with described PDCP SDU.
2. method according to claim 1, is characterized in that, described method also comprises:
Described PDCP SDU is compressed and is sent to described opposite end.
3. method according to claim 1, is characterized in that, described method also comprises:
Network side transmits message constructing status report according to the sequence number state of described PDCP SDU to be sent, and described status report is sent to described opposite end;
Accordingly, described PDCP SDU is confirmed by the status report from opposite end, comprising:
Receive the described status report that described opposite end sends, and determine the PDCPSDU that described status report is corresponding, determined PDCP SDU is confirmed by described status report.
4. method according to claim 1, is characterized in that, described method also comprises:
When the PDCP SDU sent to opposite end is confirmed by the status report from opposite end, and when determining that described PDCP SDU does not exist the PDCP PDU corresponding with described PDCP SDU, abandon described PDCPSDU.
5. the method according to any one of Claims 1-4, is characterized in that, described method also comprises:
Described PDCP SDU abandon timer expiry time, abandon described PDCP SDU.
6. a data processing equipment, is characterized in that, described device comprises the first determining unit and the first processing unit, wherein:
Described first determining unit, for when the PDCP service data unit SDU sent to opposite end confirm by the status report from opposite end time, judge whether described PDCP SDU exists the PDCP protocol Data Unit PDU corresponding with described PDCP SDU, when being, trigger described first processing unit;
Described first processing unit, for not abandoning described PDCP SDU, and does not abandon the PDCP PDU corresponding with described PDCPSDU.
7. device according to claim 6, is characterized in that, described device also comprises transmitting element, for compressing described PDCP SDU and being sent to described opposite end.
8. device according to claim 6, is characterized in that, described device also comprises the second processing unit,
When described first determining unit determines that described PDCP SDU does not exist the PDCP PDU corresponding with described PDCP SDU, trigger described second processing unit; Accordingly, described second processing unit, for abandoning described PDCP SDU.
9. according to the device described in claim 6 to 8, it is characterized in that, described device also comprises the second determining unit, for determine described PDCP SDU whether abandon timer overtime, when being, trigger described second processing unit;
Described second processing unit, for abandoning described PDCP SDU.
CN201310452437.4A 2013-09-27 2013-09-27 Method and device for data processing CN104518851A (en)

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Application publication date: 20150415