CN102045311A - Robust header compression state transition method and decompressor - Google Patents
Robust header compression state transition method and decompressor Download PDFInfo
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- CN102045311A CN102045311A CN 200910204376 CN200910204376A CN102045311A CN 102045311 A CN102045311 A CN 102045311A CN 200910204376 CN200910204376 CN 200910204376 CN 200910204376 A CN200910204376 A CN 200910204376A CN 102045311 A CN102045311 A CN 102045311A
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- 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
- H04L69/22—Parsing or analysis of headers
Abstract
The invention provides a robust header compression state transition method and a decompressor. The method comprises that: the decompressor receives an initial rate (IR) packet under a static context (SC) state, and calculates cyclical redundancy check (CRC) of static information of the IR packet; and whether the static information of the IR packet passes the CRC check is judged, if so, the CRC of the IR packet is calculated and checked and the flow is finished, otherwise, the CRC returns to the no context (NC) state, and the CRC of the IR packet is not calculated. Through the scheme, the static information of the IR packet is subjected to CRC check, and under the condition that the static information of the IR packet does not pass the CRC check, the CRC of the whole IR packet is not calculated and returns to the NC state. Therefore, the calculated amount of the CRC of the IR packet is reduced, the unnecessary state transition is avoided, the message decompression accuracy and quality of service (QoS) are improved and the null interface bandwidth is saved.
Description
Technical field
The present invention relates to robustness head compression (ROHC, RObust Header Compression) technology, refer to the method and the decompression machine of a kind of robustness compressive state migration especially.
Background technology
For some application layer business, the expense of the huge first-class information of IP is very big, and such as the VoIP business, the length of its payload is generally the 15-20 byte, and the IP head has just accounted for 40 bytes; And often comprised a large amount of redundant informations in the message header field of a certain same data stream, make head be collapsed into possibility.
ROHC is divided into different data flow with message, and (CID, Context ID) distinguished with the context sign.In the data flow life cycle, seldom change or constant information only sends limited number of time; And, then adopt corresponding compression algorithm to send for the information of dynamic change, thus reduce the transmission length of data head, improve bandwidth availability ratio.
ROHC can be divided into compressor reducer and decompression machine, compressor reducer respectively has three kinds of different operating states with decompression machine, Fig. 1 is the schematic diagram of the operating state of existing compressor reducer and decompression machine, as shown in Figure 1, the compressor reducer operating state is followed successively by initially (IR) attitude, single order (FO) attitude and second order (SO) attitude from low to high; The decompression machine operating state is followed successively by no context (NC, No Context) attitude, static context (SC, Static Context) attitude and full context (FC, Full Context) attitude from low to high.Under the different operating states, the compressor/decompressor operating efficiency is different.Generally speaking, the operating state grade is high more, and accessible compressed package type is abundant more, and operating efficiency is high more.
Situation of change according to the data flow header, ROHC is divided into static information and multidate information with data head information, these information form with static chain and dynamic chain in the IR bag exists, Fig. 2 is the schematic diagram of the IR packet format of profile1, as shown in Figure 2, ROHC conciliates the operating state that compression result can be changed decompression machine according to operating state, and utilizes feedback notice compressor reducer transition status.Whether decompression machine passes through according to cyclic redundancy code (CRC, Cyclical Redundancy Check) checking IR bag CRC: if the CRC that decompression machine calculates is consistent with the CRC that message carries, so, the CRC checking of IR bag is passed through; Otherwise checking is not passed through.
According to RFC3095 regulation, when decompression machine was in the SC attitude, the CRC checking of IR bag was not passed through, need be according to the algorithm NC attitude of moving back, and Fig. 3 handles the flow chart of IR bag when being in the SC attitude for existing decompression machine, as shown in Figure 3, comprising:
Step 300: decompression machine is operated in the SC attitude, receives the IR bag.
Step 301: calculate IR bag CRC (not comprising quiet lotus).
Step 302: judge that whether IR bag CRC and message carry CRC identical, if identical, moves to the FC attitude; If different, move back to the NC attitude according to algorithm.
But, IR bag CRC checking not by may only being because multidate information makes a mistake and causes, when static information is correct, the decompression machine NC attitude of still having moved back, and this moving back is unnecessary.And when the static information of IR bag made a mistake, decompression machine there is no need to calculate the CRC of entire I R bag, gets final product and only calculate static information CRC.Here, static information is not equal to the static chain of IR bag, also comprises context sign, bag type, overview information such as (profile).
From having the realization of ROHC state transition shown in Figure 3 now, increased IR bag CRC amount of calculation, produce unnecessary state transference, thereby reduced message decompression accuracy and service quality (QoS), wasted bandwidth of air-interface.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for a kind of robustness compressive state migration, can reduce IR bag CRC amount of calculation, avoids unnecessary state transference, thereby improves message decompression accuracy and QoS, saves bandwidth of air-interface.
Another object of the present invention is to provide a kind of decompression machine, can reduce IR bag CRC amount of calculation, avoid unnecessary state transference, thereby improve message decompression accuracy and QoS, save bandwidth of air-interface.
For achieving the above object, technical scheme of the present invention is achieved in that
The method of a kind of robustness compressive state migration comprises:
Decompression machine is received initial state IR bag under static context SC attitude, calculate the cyclic redundancy code CRC of IR bag static information; When the CRC checking of IR bag static information is not passed through, then move back to no context NC attitude.
This method also comprises: if the CRC checking of described IR bag static information is passed through, calculate and verify the CRC of described IR bag.
The CRC of described calculating and checking IR bag comprises: if described IR bag CRC checking is not passed through, keep the SC attitude constant.
If the CRC checking of described IR bag is passed through, migrate to full context FC attitude.
The CRC of described calculating IR bag static information is: according to the context sign CID in the described IR bag, bag type, profile and static chain, calculate the CRC of IR bag static information.
Described according to the CID in the described IR bag, bag type, profile and static chain, the CRC that calculates IR bag static information is specially: the static chain of resolving described IR bag, go out static chain length according to Internet Protocol/User Datagram Protoco (UDP)/RTP IP/UDP/RTP heading information calculations, calculate the CRC of described IR bag static information again.
The CRC of described calculating IR bag is: resolve the dynamic chain of described IR bag, go out dynamic chain length according to IP/UDP/RTP heading information calculations; With static CRC is initial value, according to the CRC of dynamic chain length computation IR bag.
A kind of decompression machine comprises the first verification module, second verification module and the processing module at least, wherein,
First authentication module is used for receiving that IR wraps under the SC attitude, calculate the CRC of IR bag static information, and the CRC of IR bag static information is verified, when checking is passed through, sends initiate notification to second authentication module; When checking is not passed through, send the notice of moving back to processing module;
Second authentication module is used to receive the initiate notification from first authentication module, calculates and verify the CRC of IR bag;
Processing module is used to receive the notice of moving back from first authentication module, and decompression machine is moved back to the NC attitude.
Described second authentication module also is used for, if described IR bag CRC checking is not passed through, sends the maintenance notice to processing module;
Described processing module also is used for, and receives the maintenance notice from second authentication module, and decompression machine keeps current SC attitude constant.
Described second authentication module also is used for, if the CRC checking of IR bag is passed through, sends announcing removal to processing module;
Described processing module also is used for, and receives the announcing removal from second authentication module, and decompression machine migrates to the FC attitude.
The technical scheme that provides from the invention described above comprises that decompression machine receives the IR bag under the SC attitude as can be seen, calculates the CRC of IR bag static information; Whether the CRC checking to IR bag static information is passed through, if pass through, calculates and verify the CRC of IR bag.Process ends; If do not pass through, move back to the NC attitude, and no longer calculate IR bag CRC.From the present invention program as seen, at first IR bag static information is carried out the CRC checking, be verified as under the unsanctioned situation, no longer calculate the CRC of entire I R bag, and move back to the NC attitude at the CRC of IR bag static information.Like this, reduce IR bag CRC amount of calculation, avoided unnecessary state transference, thereby improved message decompression accuracy and QoS, saved bandwidth of air-interface.
Further, if IR bag CRC checking is not passed through, keep the SC attitude constant; If the CRC checking of IR bag is passed through, migrate to the FC attitude.As seen, after the checking of IR bag static information was passed through, the CRC to entire I R bag verified again, and to the CRC checking of entire I R bag by the time, only need to keep the SC attitude, and do not need to move back again to the NC attitude.Like this, avoid unnecessary state transference, thereby improved message decompression accuracy and QoS, saved bandwidth of air-interface.
Description of drawings
Fig. 1 is the schematic diagram of the operating state of compressor reducer and decompression machine;
Fig. 2 is the schematic diagram of the IR packet format of profile1;
Fig. 3 handles the flow chart of IR bag when being in the SC attitude for existing decompression machine;
Fig. 4 is the flow chart of the method for a robustness of the present invention compressive state migration;
Fig. 5 is the composition structural representation of decompression machine of the present invention;
Fig. 6 realizes the flow chart of first embodiment of a robustness compressive state migration for the present invention;
Fig. 7 realizes the flow chart of second embodiment of a robustness compressive state migration for the present invention.
Embodiment
Fig. 4 is the flow chart of the method for a robustness of the present invention compressive state migration, as shown in Figure 4, comprising:
Step 400: decompression machine is received the IR bag under the SC attitude, calculates the CRC of IR bag static information.
Whether the CRC checking of step 401:IR bag static information is passed through, if pass through, enters step 402; If do not pass through, enter step 403.
Step 402: the CRC that calculates and verify the IR bag.Process ends.
Step 403: move back to the NC attitude, and no longer calculate the CRC of IR bag.
From the inventive method as seen, at first IR bag static information is carried out the CRC checking,, then no longer calculate the CRC of entire I R bag, and move back to the NC attitude if the CRC checking of IR bag static information is not passed through.Like this, reduced IR bag CRC amount of calculation.
Further, the CRC of calculating in the inventive method and checking IR bag also comprises: if IR bag CRC checking is not passed through, keep the SC attitude constant; If the CRC checking of IR bag is passed through, migrate to the FC attitude.As seen, after the checking of IR bag static information was passed through, the CRC to entire I R bag verified again, and to the CRC checking of entire I R bag by the time, only need to keep the SC attitude, and do not need to move back again to the NC attitude.Like this, avoid unnecessary state transference, thereby improved message decompression accuracy and QoS, saved bandwidth of air-interface.
Fig. 5 as shown in Figure 5, comprises the first verification module, second verification module and the processing module at least for the composition structural representation of decompression machine of the present invention, wherein,
First authentication module is used for receiving that IR wraps under the SC attitude, calculate the CRC of IR bag static information, and the CRC of IR bag static information is verified, when checking is passed through, sends initiate notification to second authentication module; Do not pass through in checking, send the notice of moving back to processing module.
Second authentication module is used to receive the initiate notification from first authentication module, calculates and verify the CRC of IR bag.Further, if IR bag CRC checking is not passed through, send the maintenance notice to processing module; If the CRC checking of IR bag is passed through, send announcing removal to processing module.
Processing module is used to receive the notice of moving back from first authentication module, and decompression machine is moved back to the NC attitude.Further, receive the maintenance notice from second authentication module, decompression machine keeps current SC attitude constant; Reception is from the announcing removal of second authentication module, and decompression machine migrates to the FC attitude.
Below in conjunction with embodiment the inventive method is described in detail.
Fig. 6 in first embodiment, suppose decompression machine in the SC attitude for the present invention realizes the flow chart of first embodiment of robustness compressive state migration, and IR wraps the CRC authentication failed, as shown in Figure 6, may further comprise the steps:
Step 600: decompression machine is received the IR bag in the SC attitude.
Step 601: decompression machine calculates the CRC of IR bag static information according to CID, bag type, profile and static chain.
In this step, decompression machine is resolved the static chain of IR bag, goes out static chain length according to IP/UDP/RTP heading information calculations, calculates the CRC of IR bag static information again.
The static information CRC that preserves in step 602:IR bag static information CRC and the context before compares, if both differences enter step 606; If both are identical, enter step 603.
Step 603: decompression machine calculates IR bag dynamic chain length.
Step 604: decompression machine is an initial value with static CRC, according to the CRC of dynamic chain length computation IR bag.
Step 605:IR bag CRC is different with the CRC that the IR bag carries, and then IR wraps the CRC authentication failed, and decompression machine keeps the SC attitude constant.Process ends.
Step 606: decompression machine is moved back to the NC attitude.
Fig. 7 in a second embodiment, suppose decompression machine in the SC attitude for the present invention realizes the flow chart of second embodiment of robustness compressive state migration, and IR bag CRC verifies and passes through, as shown in Figure 7, may further comprise the steps:
Step 700: decompression machine is received the IR bag in the SC attitude.
Step 701: decompression machine calculates the CRC of IR bag static information according to CID, bag type, profile and static chain.
In this step, decompression machine is resolved the static chain of IR bag, goes out static chain length according to Internet Protocol/User Datagram Protoco (UDP)/RTP (IP/UDP/RTP) heading information calculations, calculates the CRC of IR bag static information again.
Step 702: suppose that the static information CRC that preserves in IR bag static information CRC and the context before is consistent.
Step 703: decompression machine obtains IR bag dynamic chain length according to IR bag dynamic chain information; Decompression machine is an initial value with static CRC, according to the CRC of dynamic chain length computation IR bag.
The CRC that calculates the IR bag is: resolve the dynamic chain of described IR bag, go out dynamic chain length according to IP/UDP/RTP heading information calculations; With static CRC is initial value, according to the CRC of dynamic chain length computation IR bag.
Step 704:IR bag CRC is identical with the CRC that the IR bag carries, and IR bag CRC checking is passed through, and decompression machine migrates to the FC attitude.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for a robustness compressive state migration is characterized in that, comprising:
Decompression machine is received initial state IR bag under static context SC attitude, calculate the cyclic redundancy code CRC of IR bag static information; When the CRC checking of IR bag static information is not passed through, then move back to no context NC attitude.
2. method according to claim 1 is characterized in that, this method also comprises: if the CRC checking of described IR bag static information is passed through, calculate and verify the CRC of described IR bag.
3. method according to claim 2 is characterized in that, the CRC of described calculating and checking IR bag comprises: if described IR bag CRC checking is not passed through, keep the SC attitude constant.
4. method according to claim 3 is characterized in that, if the CRC checking of described IR bag is passed through, migrates to full context FC attitude.
5. according to each described method of claim 1～4, it is characterized in that the CRC of described calculating IR bag static information is:, calculate the CRC of IR bag static information according to the context sign CID in the described IR bag, bag type, profile and static chain.
6. method according to claim 5, it is characterized in that, described according to the CID in the described IR bag, bag type, profile and static chain, the CRC that calculates IR bag static information is specially: the static chain of resolving described IR bag, go out static chain length according to Internet Protocol/User Datagram Protoco (UDP)/RTP IP/UDP/RTP heading information calculations, calculate the CRC of described IR bag static information again.
7. according to claim 2,3 or 4 described methods, it is characterized in that the CRC of described calculating IR bag is: resolve the dynamic chain of described IR bag, go out dynamic chain length according to IP/UDP/RTP heading information calculations; With static CRC is initial value, according to the CRC of dynamic chain length computation IR bag.
8. a decompression machine is characterized in that, comprises the first verification module, second verification module and the processing module at least, wherein,
First authentication module is used for receiving that IR wraps under the SC attitude, calculate the CRC of IR bag static information, and the CRC of IR bag static information is verified, when checking is passed through, sends initiate notification to second authentication module; When checking is not passed through, send the notice of moving back to processing module;
Second authentication module is used to receive the initiate notification from first authentication module, calculates and verify the CRC of IR bag;
Processing module is used to receive the notice of moving back from first authentication module, and decompression machine is moved back to the NC attitude.
9. decompression machine according to claim 8 is characterized in that, described second authentication module also is used for, if described IR bag CRC checking is not passed through, sends the maintenance notice to processing module;
Described processing module also is used for, and receives the maintenance notice from second authentication module, and decompression machine keeps current SC attitude constant.
10. decompression machine according to claim 8 is characterized in that, described second authentication module also is used for, if the CRC checking of IR bag is passed through, sends announcing removal to processing module;
Described processing module also is used for, and receives the announcing removal from second authentication module, and decompression machine migrates to the FC attitude.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910204376.3A CN102045311B (en) | 2009-10-22 | 2009-10-22 | Robust header compression state transition method and decompressor |
| PCT/CN2010/075327 WO2011047567A1 (en) | 2009-10-22 | 2010-07-20 | Method for state shifting of robust header compression and decompressor thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910204376.3A CN102045311B (en) | 2009-10-22 | 2009-10-22 | Robust header compression state transition method and decompressor |
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| CN102045311B CN102045311B (en) | 2015-06-03 |
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| WO (1) | WO2011047567A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231857A (en) * | 2011-07-01 | 2011-11-02 | 四川长虹电器股份有限公司 | Set-top box starting speed increasing method |
| CN102916773A (en) * | 2012-10-10 | 2013-02-06 | 中兴通讯股份有限公司 | Static field CRC (Cyclic Redundancy Check) calibration method and device in robustness header compression |
| CN112469084A (en) * | 2020-11-26 | 2021-03-09 | 展讯通信（上海）有限公司 | Data transmission method, device, equipment, storage medium and program product |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100657253B1 (en) * | 2000-03-29 | 2006-12-14 | 삼성전자주식회사 | Apparatus for transmitting/receiving wireless packet and method thereof |
| JP3512177B2 (en) * | 2001-05-16 | 2004-03-29 | 松下電器産業株式会社 | Packet receiving apparatus and packet transmitting method |
| US7822067B2 (en) * | 2003-08-08 | 2010-10-26 | Qualcomm Incorporated | Header compression enhancement for broadcast/multicast services |
| CN1918875A (en) * | 2004-02-06 | 2007-02-21 | 艾利森电话股份有限公司 | Broadcast/multicast services with unidirectional header compression |
| KR101100200B1 (en) * | 2005-05-03 | 2011-12-28 | 엘지전자 주식회사 | method of transmitting header information of packet data for point-to-multipoint multimedia multicast service |
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2009
- 2009-10-22 CN CN200910204376.3A patent/CN102045311B/en not_active Expired - Fee Related
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2010
- 2010-07-20 WO PCT/CN2010/075327 patent/WO2011047567A1/en active Application Filing
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231857A (en) * | 2011-07-01 | 2011-11-02 | 四川长虹电器股份有限公司 | Set-top box starting speed increasing method |
| CN102231857B (en) * | 2011-07-01 | 2013-05-08 | 四川长虹电器股份有限公司 | Set-top box starting speed increasing method |
| CN102916773A (en) * | 2012-10-10 | 2013-02-06 | 中兴通讯股份有限公司 | Static field CRC (Cyclic Redundancy Check) calibration method and device in robustness header compression |
| CN102916773B (en) * | 2012-10-10 | 2016-08-03 | 中兴通讯股份有限公司 | A kind of static fields CRC check method and apparatus in robustness header compression |
| CN112469084A (en) * | 2020-11-26 | 2021-03-09 | 展讯通信（上海）有限公司 | Data transmission method, device, equipment, storage medium and program product |
| CN112469084B (en) * | 2020-11-26 | 2023-03-07 | 展讯通信（上海）有限公司 | Data transmission method, device, equipment, storage medium and program product |
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| Publication number | Publication date |
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| CN102045311B (en) | 2015-06-03 |
| WO2011047567A1 (en) | 2011-04-28 |
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