CN102045328A - Method for switching robust header compression mode and decompressor - Google Patents
Method for switching robust header compression mode and decompressor Download PDFInfo
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Abstract
The invention discloses a method for switching a robust header compression mode and a decompressor. The method comprises the following steps of: when the current mode and the target mode of the decompressor are not same, and decompression fails, sending an STSTIC-NACK (Negative ACK) to trigger mode witch; setting a mode option in the STSTIC-NACK to a target mode; and switching to the target mode. The method of the invention can show that the STSTIC-NACK is permitted to initiate mode switch, and the mode switch trigger flow is simplified so as to improve the mode switch efficiency.
Description
Technical field
The present invention relates to robustness head compression (ROHC, RObust Header Compression) technology, refer to method and decompression machine that a kind of robustness compact model switches 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, and compressor reducer respectively has three kinds of different operating states with decompression machine, and the compressor reducer operating state is followed successively by initial state (IR), single order attitude (FO) and second order attitude (SO) from low to high; The decompression machine operating state is followed successively by no context attitude (NC, No Context), static context attitude (SC, Static Context) and full context attitude (FC, Full Context) 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.
Fig. 1 is the schematic diagram of three kinds of mode of operations of existing compressor reducer and decompression machine, as shown in Figure 1, ROHC can be divided into compressor reducer and decompression machine, compressor reducer and decompression machine have three kinds of mode of operations, individual event pattern (U-mode, Unidirectional mode), bidirectional optimistic mode (O-mode, Bidirectional Optimisticmode) and bidirectional reliable mode (R-mode, Bidirectional Reliable mode).ROHC can switch between different working modes, and mode switch must be initiated by feedback by decompression machine.RFC3095 has defined three kinds of feedback kind, be respectively confirm to reply (ACK, Acknowledge), static state reject response (STATIC-NACK) and reject response (NACK, Negative ACK).And the RFC3095 regulation can only initiate mode switch by ACK or NACK, and STATIC-NACK cannot be initiated mode switch.That is to say, when whether initiating mode switch, also need to consider feedback kind,, can not initiate mode switch if when promptly judging feedback kind and being STATIC-NACK in decision.Like this, it is complicated to make that undoubtedly mode switch triggers flow process, thereby has reduced mode switch efficient.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of robustness method that a compact model switches, and can simplify mode switch and trigger flow process, thereby improve mode switch efficient.
Another object of the present invention is to provide a kind of decompression machine, can simplify mode switch and trigger flow process, thereby improve mode switch efficient.
For achieving the above object, technical scheme of the present invention is achieved in that
The method that a kind of robustness compact model switches comprises:
Present mode and target pattern at decompression machine are inconsistent, and during de-compression failure, send the static state STATIC-NACK trigger mode that rejects response and switch;
The mode option among the STATIC-NACK is set to target pattern, switches to target pattern.
The present mode and the target pattern of described decompression machine are inconsistent, and de-compression failure is:
The work at present pattern of described decompression machine is individual event pattern U-mode, no context attitude, and target pattern is bidirectional optimistic mode O-mode;
Described decompression machine receives initial state IR bag, calculates the cyclic redundancy code CRC of IR bag, if the CRC that calculates is different with the CRC that message carries, and de-compression failure then.
The present mode and the target pattern of described decompression machine are inconsistent, and de-compression failure is:
The work at present pattern of described decompression machine is bidirectional reliable mode R-mode, no context attitude, and target pattern is O-mode;
Described decompression machine receives initial dynamic IR-DYN bag, and current state can't be handled IR-DYN bag, de-compression failure.
The present mode and the target pattern of described decompression machine are inconsistent, and de-compression failure is:
The work at present pattern of described decompression machine is O-mode, no context attitude, and target pattern is U-mode;
Described decompression machine receives the UOR-2 bag, and current state can't be handled UOR-2 bag, de-compression failure.
The mode option among the described STATIC-NACK is set to target pattern:
Described decompression machine is filled to target pattern with the pattern Mode option in the STATIC-NACK feedback format.
A kind of decompression machine comprises trigger module at least, module and handover module is set, wherein,
Trigger module is used at the present mode and the target pattern of decompression machine inconsistently, and during de-compression failure, sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched to module is set;
Module is set, is used to receive the trigger notice of switching from the STATIC-NACK trigger mode of trigger module, the mode option among the STATIC-NACK is set to target pattern, and sends switching notice to handover module;
Handover module is used to receive the switching notice from module is set, and present mode is switched to target pattern.
Described trigger module specifically is used for, and the work at present pattern of described decompression machine is individual event pattern U-mode, no context attitude, and target pattern is bidirectional optimistic mode O-mode;
Described decompression machine receives initial state IR bag, calculates the cyclic redundancy code CRC of IR bag, if the CRC that calculates is different with the CRC that message carries, and de-compression failure then;
To being set, module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched.
Described trigger module specifically is used for, and the work at present pattern of described decompression machine is bidirectional reliable mode R-mode, no context attitude, and target pattern is O-mode;
Described decompression machine receives initial dynamic IR-DYN bag, and current state can't be handled IR-DYN bag, de-compression failure;
To being set, module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched.
Described trigger module specifically is used for, and the work at present pattern of described decompression machine is O-mode, no context attitude, and target pattern is U-mode;
Described decompression machine receives the UOR-2 bag, and current state can't be handled UOR-2 bag, de-compression failure;
To being set, module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched.
The described module that is provided with specifically is used for, and is used to receive the trigger notice of switching from the STATIC-NACK trigger mode of trigger module, the pattern Mode option in the STATIC-NACK feedback format is filled to target pattern, and sends switching notice to handover module.
The technical scheme that provides from the invention described above as can be seen, the present mode and the target pattern that are included in decompression machine are inconsistent, and during de-compression failure, send the STATIC-NACK trigger mode and switch; The mode option among the STATIC-NACK is set to target pattern, switches to target pattern.From the inventive method as seen, allow to initiate the method for mode switch, simplified mode switch and triggered flow process, thereby improved mode switch efficient by STATIC-NACK.
Description of drawings
Fig. 1 is the schematic diagram of three kinds of mode of operations of existing compressor reducer and decompression machine;
Fig. 2 is the schematic diagram of the composition form of existing STATIC-NACK feedback;
Fig. 3 realizes the flow chart of a robustness compact model changing method for the present invention;
Fig. 4 is the schematic diagram of the composition structure of decompression machine of the present invention;
Fig. 5 realizes the flow chart of first embodiment that a robustness compact model switches for the present invention;
Fig. 6 realizes the flow chart of second embodiment that a robustness compact model switches for the present invention;
Fig. 7 realizes the flow chart of the 3rd embodiment that a robustness compact model switches for the present invention.
Embodiment
From principle Analysis, the switching of mode of operation just triggers by feedback, and the target pattern that the notice compressor reducer switches gets final product, and must not concern with concrete feedback kind.Feedback kind just embodies current decompression result, and whether decision initiates state transition according to current state.That is to say there is no need the special processing with STATIC-NACK when whether decision initiates mode switch, should be that all feedback kind all can be initiated mode switch.Therefore, the present invention proposes mode switch is initiated in a kind of permission by STATIC-NACK method.
Fig. 3 is the flow chart that the present invention realizes the method that a robustness compact model switches, and as shown in Figure 3, may further comprise the steps:
Step 300: present mode and target pattern at decompression machine are inconsistent, and during de-compression failure, send the STATIC-NACK trigger mode and switch.
In this step, when decompression machine is operated in U-mode, no context attitude, target pattern is O-mode, decompression machine receives the IR bag, calculates the cyclic redundancy code (CRC, Cyclical Redundancy Check) of IR bag, the CRC that calculates is different with the CRC that message carries, de-compression failure; Because this moment, the present mode and the target pattern of decompression machine were inconsistent, and de-compression failure, therefore, decompression machine sends the STATIC-NACK trigger mode and switches.Perhaps,
When decompression machine is operated in R-mode, no context attitude, target pattern is O-mode, and decompression machine receives the IR-DYN bag, because current state can't be handled initial dynamically (IR-DYN) bag, de-compression failure; At this moment, the present mode and the target pattern of decompression machine are inconsistent, and de-compression failure, and therefore, decompression machine sends the STATIC-NACK trigger mode and switches.Perhaps,
When decompression machine is operated in O-mode, no context attitude, target pattern is U-mode, and decompression machine receives the UOR-2 bag, because current state can't be handled UOR-2 bag, de-compression failure; At this moment, the present mode and the target pattern of decompression machine are inconsistent, and de-compression failure, and decompression machine sends the STATIC-NACK trigger mode and switches.
Need to prove, just illustrate here, and be not intended to limit the scope of the invention.
Step 301: the mode option among the STATIC-NACK is set to target pattern.
Fig. 2 comprises feedback kind (Acktype) option, pattern (Mode) option, test serial number (SN) option, feedback option etc. for the schematic diagram of the composition form of existing STATIC-NACK feedback.
Step 302: switch to target pattern from present mode.The specific implementation of this step belongs to prior art, repeats no more here.
From the inventive method as seen, allow to initiate the method for mode switch, simplified mode switch and triggered flow process, thereby improved mode switch efficient by STATIC-NACK.
Fig. 4 as shown in Figure 4, comprises trigger module at least, module and handover module is set for the schematic diagram of the composition structure of decompression machine of the present invention, wherein,
Trigger module is used at the present mode and the target pattern of decompression machine inconsistently, and during de-compression failure, sends the trigger notice that the STATIC-NACK trigger mode is switched to module is set.
Module is set, is used to receive the trigger notice of switching from the STATIC-NACK trigger mode of trigger module, the mode option among the STATIC-NACK is set to target pattern, and sends switching notice to handover module.
Handover module is used to receive the switching notice from module is set, and present mode is switched to target pattern.
Wherein, trigger module specifically is used for, work at present pattern at decompression machine is individual event pattern U-mode, no context attitude, when target pattern is bidirectional optimistic mode O-mode, decompression machine receives initial state IR bag, calculate the cyclic redundancy code CRC of IR bag, if the CRC that calculates is different with the CRC that message carries, de-compression failure then; Trigger module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched to module is set.Perhaps,
Trigger module specifically is used for, and is bidirectional reliable mode R-mode, no context attitude in the work at present pattern of decompression machine, and when target pattern was O-mode, decompression machine received the IR-DYN bag, and current state can't be handled IR-DYN bag, de-compression failure; Trigger module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched to module is set.Perhaps,
Trigger module specifically is used for, and is O-mode, no context attitude in the work at present pattern of decompression machine, and when target pattern was U-mode, decompression machine received the UOR-2 bag, and current state can't be handled UOR-2 bag, de-compression failure; Trigger module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched to module is set.
Module is set specifically is used for, be used to receive the trigger notice of switching from the STATIC-NACK trigger mode of trigger module, the pattern Mode option in the STATIC-NACK feedback format is filled to target pattern, and sends switching notice to handover module.
Below in conjunction with embodiment the present invention program is described in detail.
Fig. 5 is the flow chart that the present invention realizes first embodiment that a robustness compact model switches, and in first embodiment, supposes that STATIC-NACK triggering U-mode switches to O-mode, as shown in Figure 5, may further comprise the steps:
Step 500: decompression machine is operated in U-mode, no context attitude, and target pattern is O-mode.
Step 501: decompression machine decompression IR wraps failure.
In this step, the CRC that decompression machine calculates the IR bag that receives supposes that the CRC that calculates is different with the CRC that message carries, and that is to say de-compression failure.Specific implementation belongs to those skilled in the art's conventional techniques means, repeats no more here.
Step 502: because the present mode of decompression machine is not equal to target pattern is that the two is inconsistent, and de-compression failure, and decompression machine sends the STATIC-NACK trigger mode and switches.
Step 503: decompression machine is filled correlated variables according to the STATIC-NACK feedback format, and the Mode option among the STATIC-NACK is filled to mode parameter O.
Step 504: decompression machine upgrades the mode switch parameter, initiates mode switch, and decompression machine work at present pattern is set to O-mode, and the decompression machine mode switch is finished.The specific implementation of this step can no longer describe in detail here referring to related protocol.
Fig. 6 is the flow chart that the present invention realizes second embodiment that a robustness compact model switches, and in a second embodiment, supposes that STATIC-NACK triggering R-mode switches to O-mode, as shown in Figure 6, comprising:
Step 600: decompression machine is operated in R-mode, no context attitude, and target pattern is O-mode.
Step 601: decompression machine receives the IR-DYN bag, because current state can't be handled the IR-DYN bag, causes de-compression failure.
Step 602: because the present mode of decompression machine is not equal to target pattern, and de-compression failure, decompression machine sends the STATIC-NACK trigger mode and switches.
Step 603: decompression machine is filled relevant option according to the STATIC-NACK feedback format, and the Mode option among the STATIC-NACK is filled to mode parameter O.
Step 604: decompression machine is provided with handoff parameter and is initial (D_TRANS=I), initiates mode switch.
Step 605: compressor/decompressor is finished the follow-up mode switching flow.
The specific implementation of step 604～step 605 can no longer describe in detail here referring to related protocol.
Fig. 7 is the flow chart that the present invention realizes the 3rd embodiment that a robustness compact model switches, and in the 3rd embodiment, supposes that STATIC-NACK triggering O-mode switches to U-mode, as shown in Figure 7, comprising:
Step 700: decompression machine is operated in O-mode, no context attitude, and target pattern is U-mode.
Step 701: decompression machine receives the UOR-2 bag, because current state can't be handled the UOR-2 bag, causes de-compression failure.
Step 702: because the present mode of decompression machine is not equal to target pattern, and de-compression failure, decompression machine sends the STATIC-NACK trigger mode and switches.
Step 703: decompression machine is filled relevant option according to the STATIC-NACK feedback format, and the Mode option among the STATIC-NACK is filled to mode parameter U.
Step 704: decompression machine is provided with handoff parameter and is initial (D_TRANS=I), initiates mode switch.
Step 705: compressor/decompressor is finished the follow-up mode switching flow.
The specific implementation of step 704～step 705 can no longer describe in detail here referring to related protocol.
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 that a robustness compact model switches is characterized in that, comprising:
Present mode and target pattern at decompression machine are inconsistent, and during de-compression failure, send the static state STATIC-NACK trigger mode that rejects response and switch;
The mode option among the STATIC-NACK is set to target pattern, switches to target pattern.
2. method according to claim 1 is characterized in that, the present mode and the target pattern of described decompression machine are inconsistent, and de-compression failure is:
The work at present pattern of described decompression machine is individual event pattern U-mode, no context attitude, and target pattern is bidirectional optimistic mode O-mode;
Described decompression machine receives initial state IR bag, calculates the cyclic redundancy code CRC of IR bag, if the CRC that calculates is different with the CRC that message carries, and de-compression failure then.
3. method according to claim 1 is characterized in that, the present mode and the target pattern of described decompression machine are inconsistent, and de-compression failure is:
The work at present pattern of described decompression machine is bidirectional reliable mode R-mode, no context attitude, and target pattern is O-mode;
Described decompression machine receives initial dynamic IR-DYN bag, and current state can't be handled IR-DYN bag, de-compression failure.
4. method according to claim 1 is characterized in that, the present mode and the target pattern of described decompression machine are inconsistent, and de-compression failure is:
The work at present pattern of described decompression machine is O-mode, no context attitude, and target pattern is U-mode;
Described decompression machine receives the UOR-2 bag, and current state can't be handled UOR-2 bag, de-compression failure.
5. according to each described method of claim 1～4, it is characterized in that the mode option among the described STATIC-NACK is set to target pattern and is:
Described decompression machine is filled to target pattern with the pattern Mode option in the STATIC-NACK feedback format.
6. a decompression machine is characterized in that, comprise trigger module at least, module and handover module are set, wherein,
Trigger module is used at the present mode and the target pattern of decompression machine inconsistently, and during de-compression failure, sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched to module is set;
Module is set, is used to receive the trigger notice of switching from the STATIC-NACK trigger mode of trigger module, the mode option among the STATIC-NACK is set to target pattern, and sends switching notice to handover module;
Handover module is used to receive the switching notice from module is set, and present mode is switched to target pattern.
7. decompression machine according to claim 6 is characterized in that described trigger module specifically is used for, and the work at present pattern of described decompression machine is individual event pattern U-mode, no context attitude, and target pattern is bidirectional optimistic mode O-mode;
Described decompression machine receives initial state IR bag, calculates the cyclic redundancy code CRC of IR bag, if the CRC that calculates is different with the CRC that message carries, and de-compression failure then;
To being set, module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched.
8. decompression machine according to claim 6 is characterized in that described trigger module specifically is used for, and the work at present pattern of described decompression machine is bidirectional reliable mode R-mode, no context attitude, and target pattern is O-mode;
Described decompression machine receives initial dynamic IR-DYN bag, and current state can't be handled IR-DYN bag, de-compression failure;
To being set, module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched.
9. decompression machine according to claim 6 is characterized in that described trigger module specifically is used for, and the work at present pattern of described decompression machine is O-mode, no context attitude, and target pattern is U-mode;
Described decompression machine receives the UOR-2 bag, and current state can't be handled UOR-2 bag, de-compression failure;
To being set, module sends the trigger notice that the static STATIC-NACK trigger mode that rejects response is switched.
10. according to each described decompression machine of claim 6～9, it is characterized in that, the described module that is provided with specifically is used for, be used to receive the trigger notice of switching from the STATIC-NACK trigger mode of trigger module, pattern Mode option in the STATIC-NACK feedback format is filled to target pattern, and sends switching notice to handover module.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102215236A (en) * | 2011-06-13 | 2011-10-12 | 中兴通讯股份有限公司 | Working mode switching method and device of robust header compression protocol (ROHC) layer |
| WO2013091373A1 (en) * | 2011-12-22 | 2013-06-27 | 中兴通讯股份有限公司 | Robust header compression feedback management method and device, and decompressor |
| CN106688222A (en) * | 2014-09-24 | 2017-05-17 | 三星电子株式会社 | Call processing method and apparatus for use in LTE system |
| CN107801212A (en) * | 2017-10-17 | 2018-03-13 | 京信通信系统（中国）有限公司 | A kind of communication means and device |
| CN114339640A (en) * | 2022-01-11 | 2022-04-12 | 赛特斯信息科技股份有限公司 | ROHC-based 5G voice transmission method |
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2009
- 2009-10-16 CN CN200910236036.9A patent/CN102045328B/en active Active
Non-Patent Citations (1)
| Title |
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| BURMEISTER C等: "RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed", 《RFC3095》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215236A (en) * | 2011-06-13 | 2011-10-12 | 中兴通讯股份有限公司 | Working mode switching method and device of robust header compression protocol (ROHC) layer |
| WO2013091373A1 (en) * | 2011-12-22 | 2013-06-27 | 中兴通讯股份有限公司 | Robust header compression feedback management method and device, and decompressor |
| CN106688222A (en) * | 2014-09-24 | 2017-05-17 | 三星电子株式会社 | Call processing method and apparatus for use in LTE system |
| CN107801212A (en) * | 2017-10-17 | 2018-03-13 | 京信通信系统（中国）有限公司 | A kind of communication means and device |
| CN114339640A (en) * | 2022-01-11 | 2022-04-12 | 赛特斯信息科技股份有限公司 | ROHC-based 5G voice transmission method |
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| CN102045328B (en) | 2016-08-03 |
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