CN1780296B - Method for restoring compressed and decompressed context rapidly - Google Patents
Method for restoring compressed and decompressed context rapidly Download PDFInfo
- Publication number
- CN1780296B CN1780296B CN 200410097738 CN200410097738A CN1780296B CN 1780296 B CN1780296 B CN 1780296B CN 200410097738 CN200410097738 CN 200410097738 CN 200410097738 A CN200410097738 A CN 200410097738A CN 1780296 B CN1780296 B CN 1780296B
- Authority
- CN
- China
- Prior art keywords
- data
- context
- packet
- layer
- pdcp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Abstract
The invention can solve the problem that is: when a great number of packets are lost at compressor end, the existing method can't fast recover context, and causes low success rate for decompressing. The method includes following steps: when data compressing end detects packet loss, it initiatively sends state indication message presenting packet loss; the data compressing end initializes the context message of packet based on the state indication message, and sends a packet carrying the context message to data decompressing end; the data decompressing end uses the context message in packet torenew the context in de-compressor and to make contexts at both end of compressor and de-compressor come into step.
Description
Technical field
The present invention relates to the communication technology, relate in particular to the method for restoring compressed and decompressed context rapidly in the WCDMA system.
Background technology
Along with the application of Internet protocol (IP) technology on wireless network increases day by day, the IP agreement both can be applied to the audio/video business, also can be applied to other data service, as: WWW browses, telnet (TELNET) and file transfer (FTP) etc.
At the characteristics of wireless channel and IP agreement, the WCDMA system has introduced a kind of IP-based header compression algorithm.By the mode of incremental encoding, in transfer of data, only transmit the changing unit of sub-header field, can increase the utilance of WCDMA system wireless resource so greatly.Such as, the packet of a transmission control protocol (TCP) (head length degree 20 bytes)+IP (head length degree 20 bytes), the head length degree after the compression has only 4 bytes, and compression ratio has reached 90%.
25.323 agreements of 3gpp (PDCP agreement) have defined a kind ofly compresses the header compression algorithm of saving air interface resource to the IP head, and this algorithm adopts the coding method of difference (DELTA).As shown in Figure 1, the key step of its header compression algorithm is as follows:
(1) sets up two peer-entities: compressor reducer and decompressor;
(2) at first compressor reducer sends BASE bag (Quan Toubao), carries contextual information;
(3) compressor reducer and decompressor are safeguarded this BASE bag simultaneously;
(4) compressor reducer compresses processing to initial data N, eliminates redundancy section, forms compressed package N
*, send to decompressor;
(5) decompressor is according to BASE bag and N
*, increase redundancy section, recover original packet N, upgrade contextual information;
(6) come the consistency of maintaining context information between compressor reducer and the decompressor by feedback.
From the beginning Ya Suo principle as can be seen, the place one's entire reliance upon contextual information of previous packet of decompressor recovery data packets, packet loss will have a strong impact on the performance of decompression; In the WCDMA network, the affirmation pattern (AM) of RLC and according to the order of sequence transfer characteristic can guarantee PDCP packet fully the order when sending arrive the opposite end.Only occur resetting at RLC, when reconstruction and SDU lost, RLC just can initiatively lose cached data packet, this moment may occur a large amount of continuous packet losses, and this will cause de-compressing into power and sharply descend.Provide certain methods to improve the success rate of decompression for addressing this problem prior art.
Prior art provides a kind of " secondary algorithm ": decompressor is after receiving a compressed data packet, decompress earlier according to the increment information that carries in the contextual information of a last packet and the compressed package, if de-compression failure, then there is packet loss in supposition, at this moment the increment information in the compressed package is doubled by step-length, and then attempt decompressing.
Though " secondary algorithm " is under the situation of losing a packet, the method that increases progressively by step-length can improve the success rate of decompression, but when continuous packet loss occurring, occur resetting as RLC, reconstruction and SDU lose, and " secondary algorithm " can't recover the de-compression failure that this mistake causes.
Prior art provides another kind of method: this method is when handling the TCP message, decompressor sends file (CONTEXT) message of feedback information-up and down to compressor reducer behind de-compression failure, the context index information that has comprised de-compression failure in the CONTEXT message, compressor reducer is after receiving the CONTEXT message, reinitialize the compressor reducer context according to the context index in the message, and in next packet, send full head bag, make the compressed and decompressed context at two ends reach synchronously; In processes user data newspaper agreement (UDP) message, owing to there is not the feedback mechanism of CONTEXT, compressor reducer inconsistent phenomenon occurs in order to prevent the two ends context, can periodically send full head bag, decompressor reinitializes the context of decompression after receiving full head bag, thereby the compressed and decompressed context that guarantees two ends reaches synchronous.
Though CONTEXT feedback mechanism and periodic refresh can be recovered compressed and decompressed context to a certain extent, have the following disadvantages:
1, decompressor only just can send the CONTEXT feedback information to compressor reducer behind de-compression failure, receives that at compressor reducer the compressed package that sends before the CONTEXT message all can lose at decompressor like this, thus the success rate that influence decompresses;
2, because the CONTEXT message belongs to in-band signalling,, will occupy a large amount of air interface resource, have a strong impact on the utilance of interface-free resources if in-band signalling is too frequent.
3, connect for User Datagram Protoco (UDP) (UDP), though the full head bag of periodic transmission can prevent to a certain extent that inconsistent phenomenon from appearring in the two ends context.If but it is too frequent to send full head bag, compression efficiency will reduce; In addition, if complete bag cycle is excessive,, in the long time, also can't recover in case the decompression mistake occurs.
Summary of the invention
The invention provides a kind of method of restoring compressed and decompressed context rapidly,, use prior art quick-recovery context soon, thereby cause de-compressing into the lower problem of power to solve when a large amount of packet loss appears in compressor end.
A kind of method of restoring compressed and decompressed context rapidly, this method comprises the steps:
A, network layer or packet data protocol PDCP layer to local terminal when the data compression end detects data-bag lost initiatively send the status indication information of representing packet loss;
B, described data compression end reinitialize the context of local terminal compressor reducer according to described status indication information, and send a packet that carries contextual information to the data decompression end of correspondence;
C, described data decompression end utilize the context of the updating context local terminal decompressor in the packet, make the context at compressor reducer and decompressor two ends synchronous.
According to said method:
In the steps A, carry out data-bag lost by the rlc layer of data compression end and detect and the transmit status indication information.
The data-bag lost that described data-bag lost is meant that RLC resets, reconstruction or service data unit SDU occur when losing.
In the steps A, described rlc layer sends to status indication information the network layer of local terminal; Among the step B, send to the PDCP of data compression end layer by described network layer and to reinitialize the contextual configuration messages of compressor reducer and by the context of this PDCP layer according to described configuration messages initialization compressor reducer.
In the steps A, described RLC sends to status indication information on the PDCP layer of local terminal; In step B, reinitialize the context of compressor reducer according to this status indication information by this PDCP layer.
The present invention occur that RLC resets, when reconstruction or SDU loss situation, RLC active transmit status indication information by the data compression end makes the PDCP of local terminal upgrade the compressor reducer context, and initiatively send full head bag to decompressor end, upgrade the context of decompressor by decompressor end, thereby can restoring compressed and decompressed context rapidly synchronously, can avoid a large amount of packet losses continuously, de-compress into power thereby improved.
Description of drawings
Fig. 1 is an IP contraction principle schematic diagram;
Fig. 2 is the logical relation schematic diagram between network and the terminal;
Fig. 3, Fig. 4 are flow chart of the present invention.
Embodiment
Consulting Fig. 2, is earlier the logical relation of example explanation compressor reducer and decompressor with network UTRAN and terminal UE.RRC (Radio Resource Controller, radio resource controller) protocol layer is network layer (L3), and it mainly is responsible for each unit (the present invention relates generally to PDCP layer and rlc protocol layer) of configuration data link layer; Packet data protocol (PDCP) layer and Radio Link control (RLC) layer are two protocol layers of data link layer (L2), and the transmission of data service is mainly finished by these two protocol layers.The PDCP layer is mainly finished the compressed and decompressed of data, and rlc layer mainly finish data transmission and with the data validation of opposite end (confirming promptly whether the data opposite end that sends receives), whether therefore, can detect packet for the rlc layer of data compression end (transmission data terminal) loses.
Be example (arrow among the figure between two PDCP layers is represented data flow) with two-way services among Fig. 2: both there had been downlink data in two-way services, and (be UTRAN-＞UE), also having upstream data (is UE-＞UTRAN) promptly.Therefore in a PDCP layer, both comprised a compressor reducer, and also comprised a decompressor, they finish the compression of downlink data and the decompression of upstream data respectively.For downlink data (UTRAN-＞UE), the compressor reducer of the PDCP layer of UTRAN sends to rlc layer after overcompression, rlc layer sends to the rlc layer of UE again through the transmission of bottom, the rlc layer of UE is submitted to the decompressor of the PDCP layer of UE, and decompressor is submitted to the upper strata after finishing decompression operation.Otherwise (UE-＞UTRAN) also is like this for transmission of uplink data.
Contextual information is some state informations that compressor reducer and decompressor are safeguarded.It is relevant with each packet.From top description as can be seen, if the decompressor of the compressor reducer of UTRAN and UE can be good at cooperative work, both must safeguard identical contextual information.If packet loss has appearred in UTRAN, the contextual information safeguarded of the decompressor of the contextual information safeguarded of the compressor reducer of UTRAN and UE has occurred inconsistently so, will cause de-compression failure like this and causes loss of data.
The present invention is in order packet loss to occur, especially occur resetting in Radio Link control (RLC), rebuild or service data unit (SDU) is lost when a large amount of packet loss occurring, can make the context of compressor reducer and the context of the decompressor of correspondence reach consistent as early as possible, by rrc layer or the PDCP layer of the rlc layer that detects loss of data (as the rlc layer of UTRAN) by interior signaling proactive notification local terminal, resend a packet that carries contextual information by rrc layer or PDCP layer notice compressor reducer then, make the contextual information of data compression end maintenance and the contextual information of the maintenance of opposite end (data decompression end) recover consistent again.
Consult Fig. 2, shown in Figure 3, holding the rlc layer that sends data and hold with UTRAN with the UTRAN end to UE is example to network layer (L3) the transmit status indication information of local terminal, as follows to the procedure declaration of recovering compressed and decompressed context:
The rlc layer of step 2, UTRA initiatively reports a bar state indication information to the network layer (L3) of local terminal, and the mass data packet loss has appearred at this moment in expression.
The PDCP layer of step 4, UTRAN is after receiving configuration information, if the R/I/C cell is set to R, and initialization compressor reducer context then, and in the next packet that sends to the UE end, carry contextual information (promptly full head wraps).
After PDCP (PDCP) layer of step 5, UE end is received the packet that carries contextual information, upgrade the decompressor context, make the context at compressor reducer and decompressor two ends reach synchronous; Simultaneously, send confirmation to UTRAN end, after the PDCP layer of UTRAN is received RLC affirmation information to this full head bag, think that the context synchronizing process finishes by RLC.
If the URTAN end does not receive that in the given time the UE termination receives the affirmation message of head bag, then resends.
Consult Fig. 2, shown in Figure 4, holding the rlc layer that sends data and hold with UTRAN with the UTRAN end to UE is example to the PDCP of local terminal layer transmit status indication information, as follows to the procedure declaration of recovering compressed and decompressed context:
The rlc layer of step 11, UTRAN by and the PDCP layer between interface, initiatively send a bar state indication information to the PDCP of this end layer, the mass data packet loss this moment appearred in expression.
The PDCP layer of step 12, UTRAN after receiving status indication information, initialization compressor reducer context, and in sending to the next packet of UE, carry contextual information (promptly full head bag).
After the PDCP layer of step 13, UE is received the packet that carries contextual information, upgrade the decompressor context, make the context of the compressor reducer that local terminal decompressor and URTAN hold reach synchronous; Simultaneously, the rlc layer of UE sends confirmation to UTRAN end, after the PDCP layer of UTRAN is received affirmation information of this full head bag, thinks that the context synchronizing process finishes.If the URTAN end does not receive that in the given time the UE termination receives the affirmation message of head bag, then resends.
When the UTRAN end sent data, the processing that the rlc layer of UE end detects data-bag lost and said process mutually in like manner repeated no more for UE end.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. the method for a restoring compressed and decompressed context rapidly is characterized in that this method comprises the steps:
A, network layer or packet data protocol PDCP layer to local terminal when the data compression end detects data-bag lost initiatively send the status indication information of representing packet loss;
B, described data compression end reinitialize the context of local terminal compressor reducer according to described status indication information, and send a packet that carries contextual information to the data decompression end of correspondence;
C, described data decompression end utilize the context of the updating context local terminal decompressor in the packet, make the context at compressor reducer and decompressor two ends synchronous.
2. the method for claim 1 is characterized in that, in the steps A, carries out data-bag lost by the rlc layer of data compression end and detects and the transmit status indication information.
3. the method for claim 1 is characterized in that, the data-bag lost that described data-bag lost is meant that RLC resets, reconstruction or service data unit SDU occur when losing.
4. method as claimed in claim 2 is characterized in that, in the steps A, described rlc layer sends to status indication information the network layer of local terminal; Among the step B, send the contextual configuration messages that reinitializes compressor reducer to the PDCP of data compression end layer by described network layer, and by the context of this PDCP layer according to this configuration messages initialization compressor reducer.
5. method as claimed in claim 2 is characterized in that, in the steps A, described RLC sends to status indication information on the PDCP layer of local terminal; In step B, reinitialize the context of compressor reducer according to this status indication information by this PDCP layer.
6. as each described method of claim 1 to 4, it is characterized in that, described data decompression end receive described carry contextual packet after, RLC by this end sends confirmation to the PDCP of data compression end, and definite context synchronizing process was finished after the PDCP of data compression end received this confirmation.
7. method as claimed in claim 6 is characterized in that, if the data compression end does not receive that in the given time the data decompression end to described affirmation message of carrying contextual packet, then resends this packet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410097738 CN1780296B (en) | 2004-11-26 | 2004-11-26 | Method for restoring compressed and decompressed context rapidly |
| PCT/CN2005/001824 WO2006056122A1 (en) | 2004-11-26 | 2005-11-02 | A method for rapidly resuming the context of compression and decompression |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410097738 CN1780296B (en) | 2004-11-26 | 2004-11-26 | Method for restoring compressed and decompressed context rapidly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1780296A CN1780296A (en) | 2006-05-31 |
| CN1780296B true CN1780296B (en) | 2010-08-04 |
Family
ID=36497737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410097738 Expired - Fee Related CN1780296B (en) | 2004-11-26 | 2004-11-26 | Method for restoring compressed and decompressed context rapidly |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1780296B (en) |
| WO (1) | WO2006056122A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453298B (en) * | 2007-12-07 | 2013-06-05 | 华为技术有限公司 | Processing method, system and apparatus for header compression in wireless network |
| CN101998248A (en) * | 2009-08-20 | 2011-03-30 | 华为技术有限公司 | Method and device of processing context information in multicast and broadcast service |
| US9838089B2 (en) | 2011-10-07 | 2017-12-05 | Futurewei Technologies, Inc. | System and method for multiple point transmission in a communications system |
| US20130088960A1 (en) | 2011-10-07 | 2013-04-11 | Futurewei Technologies, Inc. | System and Method for Information Delivery with Multiple Point Transmission |
| CN103051434A (en) * | 2012-12-20 | 2013-04-17 | 中兴通讯股份有限公司 | Data decompression and decompression processing methods and devices |
| EP3393168B1 (en) * | 2015-12-15 | 2021-08-04 | LG Electronics Inc. | User equipment and data reception method, and network node and data transmission method |
| CN107645746B (en) * | 2016-07-20 | 2021-03-16 | 深圳市中兴微电子技术有限公司 | Context updating method, system and equipment |
| CN112218390A (en) * | 2019-07-10 | 2021-01-12 | 大唐移动通信设备有限公司 | Data processing method and device |
| CN112333769B (en) * | 2019-08-05 | 2022-10-11 | 华为技术有限公司 | Communication method and device |
| CN113711558B (en) * | 2019-09-30 | 2023-07-25 | Oppo广东移动通信有限公司 | Ethernet frame packet header compression processing method and device, user terminal, base station and medium |
| CN112787980B (en) * | 2019-11-07 | 2022-05-24 | 大唐移动通信设备有限公司 | Feedback method and device |
| CN111181688B (en) * | 2019-12-20 | 2021-02-12 | 翱捷科技股份有限公司 | ROHC compressor and implementation method thereof |
| CN112333047B (en) * | 2020-11-16 | 2022-04-26 | 展讯通信（上海）有限公司 | Data transmission method, device and equipment |
| CN112469083A (en) * | 2020-11-26 | 2021-03-09 | 展讯通信（上海）有限公司 | Data transmission method, device, equipment and storage medium |
| WO2023015481A1 (en) * | 2021-08-11 | 2023-02-16 | 华为技术有限公司 | Communication method and communication apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020091860A1 (en) * | 2001-01-10 | 2002-07-11 | Nokia Mobile Phones Ltd | Relocating context information in header compression |
| CN1438809A (en) * | 2002-02-16 | 2003-08-27 | Lg电子株式会社 | Context repositioning method |
| US20040034717A1 (en) * | 2002-06-12 | 2004-02-19 | Ghyslain Pelletier | Method and apparatus for increased Internet Protocol (IP) headers compression performance by reporting cause of missing packets |
-
2004
- 2004-11-26 CN CN 200410097738 patent/CN1780296B/en not_active Expired - Fee Related
-
2005
- 2005-11-02 WO PCT/CN2005/001824 patent/WO2006056122A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020091860A1 (en) * | 2001-01-10 | 2002-07-11 | Nokia Mobile Phones Ltd | Relocating context information in header compression |
| CN1438809A (en) * | 2002-02-16 | 2003-08-27 | Lg电子株式会社 | Context repositioning method |
| US20040034717A1 (en) * | 2002-06-12 | 2004-02-19 | Ghyslain Pelletier | Method and apparatus for increased Internet Protocol (IP) headers compression performance by reporting cause of missing packets |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1780296A (en) | 2006-05-31 |
| WO2006056122A1 (en) | 2006-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2424627C2 (en) | Dynamic robust header compression | |
| CN1780296B (en) | Method for restoring compressed and decompressed context rapidly | |
| US8260287B2 (en) | Mobile communication method and system | |
| JP4965670B2 (en) | Method and apparatus for relocating header compression context in a wireless communication system | |
| US8730996B2 (en) | Method and device for reestablishment at packet data convergence protocol layer | |
| US9538426B2 (en) | Header compression optimisation method during and after handovers in cellular communication network | |
| US20020091860A1 (en) | Relocating context information in header compression | |
| KR20030068742A (en) | Method for relocating context | |
| JP2005509381A6 (en) | Wireless communication device for header compression | |
| KR20040016064A (en) | Method and system for tansmitting/receiving asymmetric two-way packet data | |
| KR20040004358A (en) | A method for header compression context control during handover in mobile data communication networks | |
| CN101197825B (en) | Method, system and device for compression message transmission | |
| WO2022237279A1 (en) | Data transmission method and apparatus | |
| CN103634843A (en) | Data transmission method, wireless network controller, base station and mobile communication system | |
| WO2021213186A1 (en) | Data processing method and apparatus | |
| CN100428733C (en) | Error recovery method and device for IP header compression in mobile communication network | |
| KR101020318B1 (en) | Method and system for tansmitting/receiving asymmetric two-way packet data | |
| KR100981823B1 (en) | Method and system for tansmitting/receiving asymmetric two-way packet data | |
| CN112333773A (en) | Communication processing method, device, apparatus and storage medium | |
| KR20020017406A (en) | Method for compression and restoration of transmitted data in client server system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20201126 |