CN101977402B - Method and device for reusing context in robustness header compression - Google Patents
Method and device for reusing context in robustness header compression Download PDFInfo
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- CN101977402B CN101977402B CN201010517382.7A CN201010517382A CN101977402B CN 101977402 B CN101977402 B CN 101977402B CN 201010517382 A CN201010517382 A CN 201010517382A CN 101977402 B CN101977402 B CN 101977402B
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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
- H04L69/04—Protocols for data compression, e.g. ROHC
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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
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- 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
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Abstract
The invention provides a method and device for reusing a context in robustness header compression, comprising a method and device for reusing the context by a compressor and a method and device for reusing the context by a decompressor, wherein the method for reusing the context by the compressor comprises the steps of: after the compressor receives a packet to be compressed, if the corresponding compression context is not found and no enough context indication CID space exists for establishing a new compression context, finding the compression context which is not used for a long time from the current existing compression context, reusing the compression context which is not used for a long time and generating a compression context of the packet to be compressed, and packaging the package to be compressed into an initialized and refreshed IR (Information Retrieval ) packet carrying a reusing indication and then sending to the decompressor. One side of the decompressor determines that the received IR packet is an IR packet for reusing the context through the reusing indication, reusing the context is not restrained by the mode of the context, thus the limited context resources can be fully utilized, and the compression efficiency is improved.
Description
Technical field
The present invention relates to a kind of robustness header compression algorithm in moving communicating field, mainly propose a kind of method and device of content reusing.
Background technology
Due to the restriction of physical condition, the transmission rate compared with wire link of the wireless link in mobile communication system is lower, and the error rate is higher.In order to limited wireless signal-path band width resource effectively can be utilized, introduce robustness head compression technology (RObust Header Compress, hereinafter referred to as ROHC).The core of ROHC is the information in the packets headers utilizing the information redundancy between the grouping of Business Stream to come between the transparent direct connected node of compression and decompression.ROHC technology is described by the RFC3095 document of IETF (Internet Engineering Task group), and in February, 2007 IETF it is revised, revision document be RFC4815.
Context (Context) is a very important concept in robustness header compression (ROHC), comprises compressed context and stored decompression context.Compressor reducer is called compressed context for the current state information set carrying out compressing; Decompressor is called stored decompression context for the current state information set carrying out decompressing.Context contains the relevant information of some packets headers before same Bao Liuzhong, as static fields, the compressed and decompressed incorporated by reference value etc. used.In addition, also comprise other information describing bag stream in context, as the change step of the variation pattern of IPID field, timestamp field, current state and pattern, clock accuracy etc.
Deposit in case there being feedback path, decompressor in ROHC can send positive feedback (ACK:acknowledge) and negative feedback (NACK:Notacknowledge, STATIC-NACK:Static-Not ackownledge) to compressor reducer.Positive feedback be decompressor after successful decompress(ion) compressed package, acknowledge message can be sent to compressor reducer, make compressor reducer can do state transition faster, improve compression efficiency; Negative feedback is that decompressor is used for notifying that compressor reducer carries out contextual renewal, improves the robustness of the whole algorithm of ROHC.
Current ROHC supports compression for uncompressed (UNCOMPRESSED), IP/UDP/RTP, IP/UDP, IP/ESP type packet packet and decompress(ion), and framework (Profile) type corresponding is respectively Profile0, Profile1, Profile2 and Profile3.Only there is a context for Profile0, then there is one or more context for other Profile types, each context is identified by a context ID (Context Identifier, hereinafter referred to as CID).
The corresponding all packet data package do not compressed of the context of ROHC Profile0 type, each context in other Profile types then divide into groups to wrap with one flow corresponding.A grouping bag stream determined by the critical field (STATIC-DEF field) that this Bao Liuzhong is all.Such as the bag stream of IPv4/UDP/RTP, be jointly determined by the source address of its IPv4 part and destination address, the source port number of UDP part and the SSRC field of destination slogan and RTP part.
ROHC compressor reducer is after receiving an original packet data bag, need first to judge this Profile type belonging to grouping bag, then corresponding to it Profile type context chained list in search context belonging to it, if do not found, create a new context and added and enter in chained list.If have found corresponding context, field corresponding with context for each field in current bag is compared and encoded, after decision-making goes out to need the compressed package type sent, packet format encapsulation compressed package desirably sends.
Only define contextual effect, content and using method in current RFC3095 agreement, contextual destruction mechanism is not set forth.But in RFC 4815 agreement, contextual reusing is described, the context of identical profile can directly be reused, and need not pattern be changed, only need send initialization and refreshing (Initiation and Refresh is called for short IR) bag carries out initialization to context, profile different and do not belong to R (Bidirectional Reliable mode, bidirectional reliable mode) context of pattern then can carry out initialization, and from U (Unidirectional mode, unidirectional mode) pattern starts, be in R pattern, should not be reused that (this point is based on R pattern and U/O (Bidirectional Optimistic mode, bidirectional optimistic mode) 0 type/1 type packet format of pattern is different, if IR bag abandons, CRC check is carried in 0/1 type bag of U/O pattern, decompressor can perceive decompress(ion) and make mistakes, and except R-0-CRC, in 0/1 type bag of R pattern, all do not carry CRC, therefore decompressor can not the failure of perception current decompress(ion), and then take corresponding remedial measure).
And in the applied environment of reality, be limited owing to consulting the operable CID space of configuration, and the context do not re-used for a long time is not also destroyed, thus cause cannot creating new context when CID space is finished.The method that now can specify according to RFC 4815 agreement carries out content reusing, do not describe in agreement and how to go to select context to be reused, the implementation method of current announcement selects do not have used context to be reused at most, but, if the context to be reused chosen is R pattern, selection can only be re-started, such system of selection may cause two kinds of adverse consequencess: 1, all contexts are all undesirable, then directly use uncompressed process bag to be compressed, it is also such process that this bag follow-up flows all packets, greatly reduce the compression efficiency of this bag stream and newly-increased bag stream, 2, context to be reused through this way selection is exactly likely that (the bag stream that this context is corresponding does not terminate the context used, follow-uply the bag to be compressed of this bag stream is still had to receive), the follow-up flow process must contextually reused after reusing contextual packet and arriving for this is caused to be reused other contexts, thus formation vicious circle, have a strong impact on compression efficiency.
Summary of the invention
The technical problem to be solved in the present invention is, provides method and the device of a kind of content reusing in robustness header compression, improves compression efficiency.
In order to solve the problems of the technologies described above, the invention provides a kind of compressor reducer and reusing contextual method, comprising:
Compressor reducer is after receiving a bag to be compressed, if do not find corresponding compressed context, and do not have enough Context identifier CID spaces to create new compressed context, then find out in the compressed context of current existence at most not by the compressed context used, do not generated the compressed context of described bag to be compressed described in reusing at most by the compressed context used, after described bag to be compressed being encapsulated as the initialization and refreshing IR bag of carrying and reusing mark, be sent to decompressor.
Further, said method also can have following characteristics:
Describedly do not belonged to unidirectional mode, bidirectional optimistic mode or bidirectional reliable mode by the compressed context used at most;
Described not identical or different from the framework type of described bag to be compressed by the compressed context used at most.
Further, said method also can have following characteristics:
Described compressor reducer in described IR bag, increases by a field reuse mark as described, or use the existing field in IR bag to reuse mark as described.
Further, said method also can have following characteristics:
Described compressor reducer is being found out at most not by after the compressed context that uses, whether do not used more than a Preset Time by the compressed context used at most described in also judging, if, at most not by the compressed context used described in just reusing, if not, then the described bag to be compressed of compressed context compression of framework 0 type is used.
Further, said method also can have following characteristics:
Described compressor reducer is not comprised by the compressed context of the described bag to be compressed of compressed context generation used described in reusing at most:
Described compressor reducer uses multidate information in the multidate information of described bag to be compressed and this compressed context of static information initialization and static information, and it is not whether identical with the framework type belonging to described bag to be compressed by the compressed context used at most described in judging, if identical, at most not by the pattern information in the compressed context that uses described in then keeping, if not identical, be not then initialized as unidirectional mode by the pattern information in the compressed context that uses at most by described.
Further, said method also can have following characteristics:
Described compressor reducer, after sending the IR bag carrying and reuse mark, receiving to indicate before stored decompression context reuses successful positive feedback, if receive negative feedback, carries the IR bag of reusing mark described in again sending to described decompressor; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and the state of described compressor reducer is IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the IR bag carrying and reuse mark after be sent to decompressor; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and the state of described compressor reducer is non-IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as dynamic part and initially refresh IR-DYN bag, or be encapsulated as the 2 type compressed packages that unidirectional mode, bidirectional optimistic mode and bidirectional reliable mode are general, then by packaged Packet Generation to decompressor.
Further, said method also can have following characteristics:
Described compressor reducer each compressed context of the current existence of local maintenance corresponding reuse mark;
Mark of reusing corresponding for described compressed context of reusing, when reusing compressed context and generating the compressed context of described bag to be compressed, is set to one first value by described compressor reducer; And after sending the IR bag carrying and reuse mark, if when receiving to indicate stored decompression context to reuse successful positive feedback, then mark of reusing corresponding for described compressed context of reusing is set to one second value;
Described compressor reducer is receiving negative feedback, or receive corresponding compressed context for described in reuse the bag to be compressed of compressed context time, what the compressed context of reusing according to local maintenance was corresponding reuse to identify judges that current whether having received indicates stored decompression context to reuse successful positive feedback.
Further, said method also can have following characteristics:
Cyclic redundancy check (CRC) code CRC is carried in described positive feedback;
Described compressor reducer, after sending the IR bag carrying and reuse mark, if receive positive feedback, and to the CRC check success in described positive feedback, is just thought and is received to indicate stored decompression context to reuse successful positive feedback.
In order to solve the problems of the technologies described above, present invention also offers a kind of decompressor and reusing contextual method, comprising:
Decompressor is when receiving one and carrying the initialization and refreshing IR bag of reusing mark, and obtain the Context identifier CID in described IR bag, find corresponding decompression context according to described CID, then decompress context according to described IR initialization packet.
Further, said method also can have following characteristics:
The described decompressor context that decompresses according to described IR initialization packet comprises:
Decompress described in the multidate information that described decompressor uses described IR to wrap and static information initialization multidate information in context and static information, and whether judge that described IR wraps identical with the framework type belonging to described decompression context, if identical, then keep the pattern information in described decompression context, if not identical, then the pattern information in described decompression context is initialized as unidirectional mode.
Further, said method also can have following characteristics:
Described decompressor is successfully completed described decompression context initialization according to described IR bag, and after going out described IR bag according to the decompression context successful decompression after renewal, sends the positive feedback of carrying cyclic redundancy check (CRC) code CRC to described compressor reducer.
In order to solve the problems of the technologies described above, present invention also offers a kind of compressor reducer, comprise receiver module, processing module and sending module, wherein:
Described receiver module, in order to after receiving a bag to be compressed, sends it to described processing module;
Described processing module, in order to after receiving a bag to be compressed from described receiver module, the compressed context that described bag to be compressed is corresponding is searched from the compressed context of current existence, if cannot find, and when judging do not have enough Context identifier CID spaces to create new compressed context, find out at most not by the compressed context used from the compressed context of current existence, do not generated the compressed context of described bag to be compressed at most by the compressed context used described in reusing, described sending module is sent to after described bag to be compressed being encapsulated as the initialization and refreshing IR bag of carrying and reusing mark,
Described sending module, in order to go out the Packet Generation received from described processing module.
Further, said compressor also can have following characteristics:
Describedly do not belonged to unidirectional mode, bidirectional optimistic mode or bidirectional reliable mode by the compressed context used at most;
Described not identical from the framework type of this bag to be compressed or different by the compressed context used at most.
Further, said compressor also can have following characteristics:
Described processing module, is in described IR bag, increase by a field reuse mark as described, or uses the existing field in IR bag to reuse mark as described.
Further, said compressor also can have following characteristics:
Described processing module, finding out at most not by after the compressed context that uses, whether do not used more than a Preset Time by the compressed context used at most described in also judging, if, at most not by the compressed context used described in just reusing, if not, then the described bag to be compressed of compressed context compression of framework 0 type is used.
Further, said compressor also can have following characteristics:
Described processing module is not comprised by the compressed context of the described bag to be compressed of compressed context generation used described in reusing at most:
Described processing module uses multidate information in the multidate information of described bag to be compressed and this compressed context of static information initialization and static information, and it is not whether identical with the framework type belonging to described bag to be compressed by the compressed context used at most described in judging, if identical, at most not by the pattern information in the compressed context that uses described in then keeping, if not identical, be not then initialized as unidirectional mode by the pattern information in the compressed context that uses at most by described.
Further, said compressor also can have following characteristics:
Described processing module, after sending the IR bag carrying and reuse mark, receiving to indicate before stored decompression context reuses successful positive feedback, if receive negative feedback, carries the IR bag of reusing mark described in again sending to described sending module; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and current state is IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the IR bag carrying and reuse mark after be sent to described sending module; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and current state is non-IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as dynamic part and initially refresh IR-DYN bag, or be encapsulated as the 2 type compressed packages that unidirectional mode, bidirectional optimistic mode and bidirectional reliable mode are general, then by packaged Packet Generation extremely described sending module.
Further, said compressor also can have following characteristics:
Described processing module also safeguard each compressed context of current existence corresponding reuse mark;
Mark of reusing corresponding for described compressed context of reusing, when reusing compressed context and generating the compressed context of described bag to be compressed, is also set to one first value by described processing module; And after sending the IR bag carrying and reuse mark, if when receiving to indicate stored decompression context to reuse successful positive feedback, then also mark of reusing corresponding for described compressed context of reusing is set to one second value;
Described processing module is also receiving negative feedback, or receive corresponding compressed context for described in reuse the bag to be compressed of compressed context time, corresponding the reusing of compressed context of reusing described in safeguarding according to it identifies and judges that current whether having received indicates stored decompression context to reuse successful positive feedback.
Further, said compressor also can have following characteristics:
Cyclic redundancy check (CRC) code CRC is carried in described positive feedback;
Described processing module, after sending the IR bag carrying and reuse mark, if receive positive feedback, and to the CRC check success in described positive feedback, is just thought and is received to indicate stored decompression context to reuse successful positive feedback.
In order to solve the problems of the technologies described above, present invention also offers a kind of decompressor, comprise receiver module, processing module, wherein:
Described receiver module, receive one carry the initialization of reusing mark and refresh IR bag after, send it to described processing module;
Described processing module, obtains the Context identifier CID in described IR bag, finds out corresponding decompression context according to this CID, then refreshes described decompression context according to described IR bag.
Further, above-mentioned decompressor also can have following characteristics:
The described processing module context that decompresses according to described IR initialization packet comprises:
Decompress described in the multidate information that described processing module uses described IR to wrap and static information initialization multidate information in context and static information, and whether judge that described IR wraps identical with the framework type belonging to described decompression context, if identical, then keep the pattern information in described decompression context, if not identical, then the pattern information in described decompression context is initialized as unidirectional mode.
Further, above-mentioned decompressor also can have following characteristics:
Described processing module is successfully completed described decompression context initialization according to described IR bag, and after going out described IR bag according to the decompression context successful decompression after renewal, also sends the positive feedback of carrying cyclic redundancy check (CRC) code CRC.
A kind of method of content reusing and device in robustness header compression provided by the invention, have the following advantages relative to prior art tool:
1, the context being in R pattern can be reused;
2, avoid reusing the context used;
3, improve compression efficiency.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of a kind of compressor reducer content reusing of the embodiment of the present invention;
Fig. 2 A is the IR packet format of protocol definition in prior art;
Fig. 2 B is a kind of format adding the IR bag of content reusing mark of the embodiment of the present invention;
Fig. 3 is the method flow diagram of a kind of decompressor content reusing of the embodiment of the present invention;
Fig. 4 is the method flow diagram of a kind of compressor reducer content reusing of application example of the present invention;
Fig. 5 is the process flow figure to positive feedback in application example content reusing process of the present invention;
Fig. 6 is the process flow figure to negative feedback in application example content reusing process of the present invention;
Fig. 7 is the method flow diagram of a kind of compressor compresses packet of application example of the present invention;
Fig. 8 is the method flow diagram of a kind of decompressor content reusing of application example of the present invention.
Embodiment
Embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
See Fig. 1, the figure shows a kind of compressor reducer of the embodiment of the present invention and reuse contextual method, comprise step:
Step S101: compressor reducer is after receiving a bag to be compressed, if do not find corresponding compressed context, and do not have enough CID spaces to create new compressed context, then find out in the compressed context of current existence at most not by the compressed context used;
Step S102: described compressor reducer reuse described in do not generated the compressed context of described bag to be compressed at most by the compressed context that uses, and described bag to be compressed be encapsulated as the initialization of carrying and reusing mark and be sent to decompressor after refreshing IR bag.
Wherein, the described any one that can not belonged to by the compressed context used at most in unidirectional mode, bidirectional optimistic mode or bidirectional reliable mode; Described at most can be not identical with the framework type of this bag to be compressed by the compressed context used, also can be different.
Wherein, described compressor reducer is not comprised by the compressed context that the compressed context that uses generates described bag to be compressed described in reusing at most: described compressor reducer uses multidate information in the multidate information of described bag to be compressed and this compressed context of static information initialization and static information, and it is not whether identical with the framework type belonging to described bag to be compressed by the compressed context used at most described in judging, if identical, at most not by the pattern information in the compressed context that uses described in then keeping, if not identical, then be not initialized as unidirectional mode by the pattern information in the compressed context that uses at most by described.
Wherein, described IR bag is in order to decompression context corresponding to the compressed context of reusing described in initialization.Described IR bag can comprise this reuse after the multidate information of compressed context and static information, pattern information, cid information, and the information such as the load of bag to be compressed.
The application carries dexterously and reuses mark in IR bag, decompressor side by the IR bag of reusing mark and determining to receive for reusing IR bag hereafter, then the content reusing that corresponding decompression context completes decompressor side is refreshed, guarantee that the context synchronized update of compressor side conciliate by compressor reducer, thus ensure the correctness of Compress softwares compression process.Adopt embodiment of the present invention technical scheme, mark instruction IR bag classification is reused owing to increasing, therefore when reusing context, no longer be subject to context pattern restriction, the context of R pattern also can be reused, for RFC 4815 agreement, limited context resource can be taken full advantage of, improve compression efficiency.
In specific implementation, described compressor reducer can increase by a field and reuse mark as described in described IR bag, and the existing field during IR also can be used to wrap reuses mark as described.Such as, see Fig. 2 A and Fig. 2 B, wherein Fig. 2 A is the IR packet format of RFC3095 protocol definition, and Fig. 2 B is using the highest-order bit of the profile field in IR packet format as the schematic diagram of reusing mark.Wherein, CID field comprises additional CID (Add-CID) field and long type CID (Large CIDs) field: Add-CID field is mainly in order to carry the CID (Small CIDs) of short type, Large CIDs field, in order to carry long type CID.When the Context identifier space be configured is more than 15, then that think that compressor reducer and decompressor use is all long type CID, otherwise is short type CID.Dynamic chain is in order to carry the multidate information of bag to be compressed.Static chain is in order to carry the static information of bag to be compressed.Payload field is in order to carry the load of bag to be compressed.
Preferably, during in order to avoid reusing context, employ the context used, can also find out at most not by after the compressed context that uses, whether do not used more than a Preset Time by the compressed context used at most described in judgement, if so, just reuse described at most not by the compressed context used.If do not exceeded described Preset Time by the time used by the compressed context used at most, then do not reuse this context, use the compressed context of compressed context as described bag to be compressed of profile0 type.
Preferably, the embodiment of the present invention also provides a kind of method, when to perform content reusing first and be unsuccessful, remedies mode by follow-up, again sends the IR bag carrying and reuse mark to decompressor, thus effectively guarantees the success of content reusing, comprising:
Described compressor reducer, after sending the IR bag carrying and reuse mark, receiving to indicate before stored decompression context reuses successful positive feedback, if receive negative feedback, carries the IR bag of reusing mark described in again sending to described decompressor; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and the state of described compressor reducer is IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the initialization of carrying and reusing mark and be sent to decompressor after refreshing IR bag; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and the state of described compressor reducer is non-IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the initial update IR-DYN of dynamic part and wrap, or be encapsulated as the 2 type compressed packages that unidirectional mode, bidirectional optimistic mode and bidirectional reliable mode are general, namely UOR-2 bag, then by packaged Packet Generation to decompressor.
Above-mentioned follow-up remedial measure in specific implementation, Ke Yishi:
Described compressor reducer each compressed context of the current existence of local maintenance corresponding reuse mark;
Mark of reusing corresponding for described compressed context of reusing, when reusing compressed context and generating the compressed context of described bag to be compressed, is set to one first value by described compressor reducer; And after sending the IR bag carrying and reuse mark, if when receiving to indicate stored decompression context to reuse successful positive feedback, then mark of reusing corresponding for described compressed context of reusing is set to one second value.Described compressor reducer is receiving negative feedback, or receive corresponding compressed context for described in reuse the bag to be compressed of compressed context time, what the compressed context of reusing according to local maintenance was corresponding reuse, and mark judges that current whether having received indicates stored decompression context to reuse successful positive feedback, if corresponding the reusing of the compressed context of reusing is namely designated described first value, then stored decompression context is reused not yet successful, if described in corresponding the reusing of compressed context of reusing be designated described second value, then stored decompression context is reused successful.
Preferably, cyclic redundancy check (CRC) code CRC can also be carried in described positive feedback.Described compressor reducer, after sending the IR bag carrying and reuse mark, if receive positive feedback, and to the CRC check success in described positive feedback, is just thought and is received to indicate stored decompression context to reuse successful positive feedback.
See Fig. 3, the figure shows a kind of decompressor of the embodiment of the present invention and reuse contextual method, comprise step:
Step S301: decompressor, when receiving the initialization and refreshing IR bag that carry and reuse mark, obtains the Context identifier CID in described IR bag;
Step S302: described decompressor finds corresponding decompression context according to described CID;
Step S303: the decompression context that described decompressor finds according to described IR initialization packet.
Wherein, the described decompressor context that decompresses according to described IR initialization packet comprises:
Decompress described in the multidate information that described decompressor uses described IR to wrap and static information initialization multidate information in context and static information, and whether judge that described IR wraps identical with the framework type belonging to described decompression context, if identical, then keep the pattern information in described decompression context, if not identical, then the pattern information in described decompression context is initialized as unidirectional mode.
Preferably, described decompressor is successfully completed described decompression context initialization according to described IR bag, and after going out described IR bag according to the decompression context successful decompression after renewal, the positive feedback of carrying cyclic redundancy check (CRC) code CRC is sent, to inform that compressor reducer stored decompression context is reused successfully to described compressor reducer.
Adopt embodiment of the present invention technical scheme, decompressor is to reuse the classification that mark identifies IR bag, thus the restriction in the pattern existed when having broken away from content reusing in prior art, the context of R pattern also can be reused, for RFC 4815 agreement, limited context resource can be taken full advantage of, improve compression efficiency.
With an embody rule example, embodiment of the present invention is described below.
Compressor reducer, after receiving a bag to be compressed, if do not find corresponding compressed context, and does not have enough Context identifier CID spaces to create new compressed context, then performs content reusing method shown in Fig. 4, comprise step:
Step S401: profile belonging to bag to be compressed analyzed by compressor reducer, is designated as Profile_cur, performs step S402;
Step S402: described compressor reducer finds out untapped compressed context at most, is designated as Ctx_long, performs step S403;
Step S403: described compressor reducer obtains the time T_a of the nearest handle packet of Ctx_long, performs step S404;
Step S404: described compressor reducer obtains present system time T_cur, performs step S405;
Step S405: described compressor reducer calculates the difference of T_cur and T_a, and is designated as T, performs step S406;
Step S406: described compressor reducer judges whether T is greater than the threshold value of setting, if so, then performs step S407; Otherwise, perform step S416;
Step S407: described compressor reducer reads the profile value of Ctx_long, is designated as Profile_reuse, performs step S408;
Step S408: described compressor reducer judges that whether Profile_cur and Profile_reuse is equal, if so, then performs step S409, otherwise, perform step S411;
Step S409: described compressor reducer retains the pattern information of Ctx_long, performs step S410;
Step S410: described compressor reducer uses multidate information and the static information initialization Ctx_long of bag to be compressed, performs step S415;
Step S411: described compressor reducer judges whether Ctx_long is R pattern, if so, then performs step S412, otherwise performs step S413;
Step S412: it is set to 1 at the mark ReUseFg that reuses that the described Ctx_long of local maintenance is corresponding by described compressor reducer, performs step S413;
Step S413: described compressor reducer uses multidate information and the static information initialization Ctx_long of bag to be compressed, performs step S414;
Step S414: the pattern information of Ctx_long is set to U by described compressor reducer, performs step S415;
Step S415: described compressor reducer generates IR bag according to the compressed context after reusing, is set to 1 by the highest-order bit of profile field in described IR bag, then described IR bag is sent to decompressor, terminates;
In this application example, in IR bag, the highest-order bit of profile field is as reusing mark, and its value is that 1 expression is reused, and its value is that 0 expression is not reused.In Another Application example, also can arrange, its value is that 0 expression is reused, and its value is that 1 expression is not reused.Certainly, also can increase by a field in described IR bag and reuse mark as described, or other the existing fields during IR can also be used to wrap reuse mark as described.
Step S416: described compressor reducer uses the compressed context of context as described bag to be compressed of profile 0 type, terminates.
Described compressor reducer, after receiving the positive feedback and negative feedback that decompressor returns, analysis context will be reused whether success according to this, and make corresponding process according to analysis result, specifically see Fig. 5 and Fig. 6.
Fig. 5 shows the process of embodiment of the present invention compressor reducer when ReUseFg puts 1 to positive feedback, comprises step:
Step S501: described compressor reducer receives feedback data, performs step S502;
Step S502: described compressor reducer judges that described feedback data is the 2 type positive feedback of carrying CRC, performs step S503;
Step S503: described compressor reducer judges whether CRC check is passed through, if so, then performs step S504; Otherwise, terminate this positive feedback handling process;
Step S504: described compressor reducer judges whether the ReUseFg that described Ctx_long is corresponding is 1, if so, then performs step S505, otherwise, perform step S506;
Step S505: ReUseFg corresponding for described Ctx_long is set to 0 by described compressor reducer, performs step S506;
So far, described compressor reducer can confirm that decompressor side has completed that decompression corresponding to Ctx_long is contextual reuses, and content reusing success, therefore, is set to 0 by ReUseFg corresponding for described Ctx_long, terminates content reusing process.
Step S506: this feedback information of Normal Feedback flow processing pressed by described compressor reducer, terminates this positive feedback handling process.
Fig. 6 shows the process of embodiment of the present invention compressor reducer when ReUseFg puts 1 to negative feedback, comprises step:
Step S601: described compressor reducer receives feedback data, performs step S602;
Step S602: described compressor reducer judges that described feedback data is negative feedback, performs step S603;
Step S603: described compressor reducer judges whether the ReUseFg that described Ctx_long is corresponding is 1, if not, then performs step S604, if so, then performs step S605;
Step S604: this negative feedback of Normal Feedback flow processing pressed by described compressor reducer, terminates this negative feedback handling process;
Step S605: described compressor reducer resends the IR carrying content reusing mark and wraps to decompressor, terminates this negative feedback handling process.
So far, what compressor reducer determined to receive negative feedback instruction is, decompressor side does not complete that decompression corresponding to Ctx_long is contextual reuses, the content reusing failure of decompressor side, need again to send to decompressor the IR bag carrying content reusing mark, again attempt content reusing operation to control decompressor side.
Described compressor reducer also according to the value of ReUseFg corresponding to the described Ctx_long of its local maintenance, judges whether content reusing completes, and treats compressed package according to this and carry out compression process, specifically see Fig. 7, comprises the steps:
Step S701: described compressor reducer receives bag to be compressed, performs step S702;
Step S702: described compressor reducer judges whether compressed context ReUseFg is 1, if so, then performs step S704, otherwise performs step S703;
Step S703: described compressor reducer, by normal compression process process, terminates;
Step S704: described compressor reducer judges whether compressor state is IR state, if so, then performs step S705, otherwise performs step S706;
Step S705: described compressor reducer is sent to decompressor after described bag to be compressed being encapsulated as the initialization and refreshing IR bag of carrying and reusing mark, performs step S707;
Step S706: described compressor reducer is sent to decompressor after described bag to be compressed being encapsulated as IR-DYN bag or UOR-2 bag, performs step S707;
Step S707: described compressor reducer forbids that compressor reducer moves to Second Order state (Second Order is called for short SO) state, terminates.
SO state is the most high state of compressor reducer, and the compression efficiency of compressor reducer is the highest in this condition.
Correspondingly, embodiment of the present invention decompressor, after receiving the compressed package that described compressor reducer sends, will perform following steps, complete the content reusing of decompressor side, specifically as shown in Figure 8, comprise:
Step S801: decompressor receives compressed package, performs step S802;
Step S802: compressed package form analyzed by described decompressor, performs step S803;
Step S803: described decompressor judges whether compressed package is IR bag, if so, then performs step S805; Otherwise perform step S804;
Step S804: described decompressor decompresses by proper solution baric flow journey, terminates;
Step S805: described decompressor read described IR wrap in reuse flag, be designated as V_R, perform step S806;
Step S806: described decompressor judges whether V_R equals 1, if so, then performs step S807; Otherwise perform step S815;
In the present embodiment, in IR bag, the highest-order bit of profile field is as reusing mark, and its value is that 1 expression is reused, and its value is that 0 expression is not reused.In Another Application example, also can arrange, its value is that 0 expression is reused, and its value is that 1 expression is not reused.Certainly, also can increase by a field in described IR bag and reuse mark as described, or other the existing fields during IR can also be used to wrap reuse mark as described.
Step S807: described decompressor obtains the profile value in described IR bag, is designated as V_P1, performs step S808;
Step S808: described decompressor finds corresponding stored decompression context according to the CID in described IR bag, obtains the profile value in described decompression context, is designated as V_P2, perform step S809;
Step S809: the sliding window in described decompressor deletion stored decompression context and translation table, perform step S810;
Step S810: described decompressor judges that whether V_P1 and V_P2 is equal, if equal, performs step S812, otherwise performs step S811;
Step S811: the pattern information in described decompression context removed by described decompressor, arranging pattern information is U pattern, performs step S812;
Step S812: described decompressor, according to the contextual static information of described IR bag content refresh and multidate information, performs step S813;
Step S813: described decompressor wrap according to the decompression context described IR that decompresses after upgrading, execution step S814;
Step S814: described decompressor transmission carries the 2 type positive feedback of CRC to compressor reducer, terminates;
Step S815: described decompressor, according to the contextual static information of described IR bag content refresh and multidate information, performs step S816;
Step S816: described decompressor wrap according to the decompression context described IR that decompresses after upgrading, end.
Described decompressor can trigger negative feedback according to existing agreement regulation, comprise: the CRC check of carrying in compressed package is made mistakes, or have received not treatable compressed package according to decompressor current state, if there is feedback path to exist, decompressor can send negative feedback to compressor reducer, enable compressor reducer make corresponding adjustment according to negative feedback, avoid subsequent compression to decompress and make mistakes.
Reusing contextual method to realize said compressor, present invention also offers a kind of compressor reducer, comprising receiver module, processing module and sending module, wherein:
Described receiver module, in order to after receiving a bag to be compressed, sends it to described processing module;
Described processing module, in order to after receiving a bag to be compressed from described receiver module, the compressed context that described bag to be compressed is corresponding is searched from the compressed context of current existence, if cannot find, and when judging do not have enough Context identifier CID spaces to create new compressed context, find out at most not by the compressed context used from the compressed context of current existence, do not generated the compressed context of described bag to be compressed at most by the compressed context used described in reusing, described sending module is sent to after described bag to be compressed being encapsulated as the initialization and refreshing IR bag of carrying and reusing mark,
Described sending module, in order to go out the Packet Generation received from described processing module.
Wherein, the described any one that can not belonged to by the compressed context used at most in unidirectional mode, bidirectional optimistic mode or bidirectional reliable mode; Described at most can be not identical with the framework type of this bag to be compressed by the compressed context used, also can be different.
In specific implementation, described processing module can increase by a field and reuse mark as described in described IR bag, and the existing field during IR also can be used to wrap reuses mark as described.
Preferably, during in order to avoid reusing context, employ the context used, described processing module can also found out at most not by after the compressed context that uses, whether do not used more than a Preset Time by the compressed context used at most described in judgement, if so, at most not by the compressed context used described in just reusing, if not, then the described bag to be compressed of compressed context compression of framework 0 type is used.
Wherein, described processing module reuse described in do not comprised by the compressed context that the compressed context that uses generates described bag to be compressed at most:
Described processing module uses multidate information in the multidate information of described bag to be compressed and this compressed context of static information initialization and static information, and it is not whether identical with the framework type belonging to described bag to be compressed by the compressed context used at most described in judging, if identical, at most not by the pattern information in the compressed context that uses described in then keeping, if not identical, be not then initialized as unidirectional mode by the pattern information in the compressed context that uses at most by described.
Preferably, in order to ensure content reusing success, described processing module is after sending the IR bag carrying and reuse mark, receiving to indicate before stored decompression context reuses successful positive feedback, if receive negative feedback, described in again sending to described sending module, carry the IR bag of reusing mark; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and current state is IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the IR bag carrying and reuse mark after be sent to described sending module; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and current state is non-IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as dynamic part and initially refresh IR-DYN bag, or be encapsulated as the 2 type compressed packages that unidirectional mode, bidirectional optimistic mode and bidirectional reliable mode are general, then by packaged Packet Generation extremely described sending module.
Preferably, described processing module also safeguard each compressed context of current existence corresponding reuse mark.Mark of reusing corresponding for described compressed context of reusing, when reusing compressed context and generating the compressed context of described bag to be compressed, is also set to one first value by described processing module; And after sending the IR bag carrying and reuse mark, if when receiving to indicate stored decompression context to reuse successful positive feedback, then also mark of reusing corresponding for described compressed context of reusing is set to one second value;
Described processing module is also receiving negative feedback, or receive corresponding compressed context for described in reuse the bag to be compressed of compressed context time, corresponding the reusing of compressed context of reusing described in safeguarding according to it identifies and judges that current whether having received indicates stored decompression context to reuse successful positive feedback.
Preferably, cyclic redundancy check (CRC) code CRC is carried in described positive feedback.Described processing module, after sending the IR bag carrying and reuse mark, if receive positive feedback, and to the CRC check success in described positive feedback, is just thought and is received to indicate stored decompression context to reuse successful positive feedback.
Reusing contextual method to realize above-mentioned decompressor, present invention also offers a kind of decompressor, comprising receiver module, processing module, wherein:
Described receiver module, receive one carry the initialization of reusing mark and refresh IR bag after, send it to described processing module.Described processing module, obtains the Context identifier CID in described IR bag, finds out corresponding decompression context according to this CID, then refreshes described decompression context according to described IR bag.
Wherein, the described processing module context that decompresses according to described IR initialization packet comprises:
Decompress described in the multidate information that described processing module uses described IR to wrap and static information initialization multidate information in context and static information, and whether judge that described IR wraps identical with the framework type belonging to described decompression context, if identical, then keep the pattern information in described decompression context, if not identical, then the pattern information in described decompression context is initialized as unidirectional mode.
Preferably, described processing module is successfully completed described decompression context initialization according to described IR bag, and after going out described IR bag according to the decompression context successful decompression after renewal, also sends the positive feedback of carrying cyclic redundancy check (CRC) code CRC.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. a contextual method reused by compressor reducer, it is characterized in that, comprising:
Compressor reducer is after receiving a bag to be compressed, if do not find corresponding compressed context, and do not have enough Context identifier CID spaces to create new compressed context, then find out in the compressed context of current existence at most not by the compressed context used, do not generated the compressed context of described bag to be compressed described in reusing at most by the compressed context used, after described bag to be compressed being encapsulated as the initialization and refreshing IR bag of carrying and reusing mark, be sent to decompressor;
Described compressor reducer, after sending the IR bag carrying and reuse mark, receiving to indicate before stored decompression context reuses successful positive feedback, if receive negative feedback, carries the IR bag of reusing mark described in again sending to described decompressor; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and the state of described compressor reducer is IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the IR bag carrying and reuse mark after be sent to decompressor; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and the state of described compressor reducer is non-IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as dynamic part and initially refresh IR-DYN bag, or be encapsulated as the 2 type compressed packages that unidirectional mode, bidirectional optimistic mode and bidirectional reliable mode are general, then by packaged Packet Generation to decompressor.
2. the method for claim 1, is characterized in that:
Describedly do not belonged to unidirectional mode, bidirectional optimistic mode or bidirectional reliable mode by the compressed context used at most;
Described not identical or different from the framework type of described bag to be compressed by the compressed context used at most.
3. the method for claim 1, is characterized in that:
Described compressor reducer in described IR bag, increases by a field reuse mark as described, or use the existing field in IR bag to reuse mark as described.
4. the method for claim 1, is characterized in that:
Described compressor reducer is being found out at most not by after the compressed context that uses, whether do not used more than a Preset Time by the compressed context used at most described in also judging, if, at most not by the compressed context used described in just reusing, if not, then the described bag to be compressed of compressed context compression of framework 0 type is used.
5. the method for claim 1, is characterized in that, described compressor reducer reuse described in do not comprised by the compressed context that the compressed context that uses generates described bag to be compressed at most:
Described compressor reducer uses multidate information in the multidate information of described bag to be compressed and this compressed context of static information initialization and static information, and it is not whether identical with the framework type belonging to described bag to be compressed by the compressed context used at most described in judging, if identical, at most not by the pattern information in the compressed context that uses described in then keeping, if not identical, be not then initialized as unidirectional mode by the pattern information in the compressed context that uses at most by described.
6. the method for claim 1, is characterized in that:
Described compressor reducer each compressed context of the current existence of local maintenance corresponding reuse mark;
Mark of reusing corresponding for described compressed context of reusing, when reusing compressed context and generating the compressed context of described bag to be compressed, is set to one first value by described compressor reducer; And after sending the IR bag carrying and reuse mark, if when receiving to indicate stored decompression context to reuse successful positive feedback, then mark of reusing corresponding for described compressed context of reusing is set to one second value;
Described compressor reducer is receiving negative feedback, or receive corresponding compressed context for described in reuse the bag to be compressed of compressed context time, what the compressed context of reusing according to local maintenance was corresponding reuse to identify judges that current whether having received indicates stored decompression context to reuse successful positive feedback.
7. the method for claim 1, is characterized in that, also comprises:
Cyclic redundancy check (CRC) code CRC is carried in described positive feedback;
Described compressor reducer, after sending the IR bag carrying and reuse mark, if receive positive feedback, and to the CRC check success in described positive feedback, is just thought and is received to indicate stored decompression context to reuse successful positive feedback.
8. a contextual method reused by decompressor, it is characterized in that, comprising:
Decompressor is when receiving one and carrying the initialization and refreshing IR bag of reusing mark, and obtain the Context identifier CID in described IR bag, find corresponding decompression context according to described CID, then decompress context according to described IR initialization packet;
Described decompression machine is made mistakes according to the cyclic redundancy check (CRC) code CRC check of carrying in compressed package or be have received not treatable compressed package, sends negative feedback to described compressor reducer;
The described decompressor context that decompresses according to described IR initialization packet comprises:
Decompress described in the multidate information that described decompressor uses described IR to wrap and static information initialization multidate information in context and static information, and whether judge that described IR wraps identical with the framework type belonging to described decompression context, if identical, then keep the pattern information in described decompression context, if not identical, then the pattern information in described decompression context is initialized as unidirectional mode.
9. method as claimed in claim 8, is characterized in that:
Described decompressor is successfully completed described decompression context initialization according to described IR bag, and after going out described IR bag according to the decompression context successful decompression after renewal, sends the positive feedback of carrying cyclic redundancy check (CRC) code CRC to described compressor reducer.
10. a compressor reducer, is characterized in that, comprises receiver module, processing module and sending module, wherein:
Described receiver module, in order to after receiving a bag to be compressed, sends it to described processing module;
Described processing module, in order to after receiving a bag to be compressed from described receiver module, the compressed context that described bag to be compressed is corresponding is searched from the compressed context of current existence, if cannot find, and when judging do not have enough Context identifier CID spaces to create new compressed context, find out at most not by the compressed context used from the compressed context of current existence, do not generated the compressed context of described bag to be compressed at most by the compressed context used described in reusing, described sending module is sent to after described bag to be compressed being encapsulated as the initialization and refreshing IR bag of carrying and reusing mark,
Described sending module, in order to go out the Packet Generation received from described processing module;
Described processing module, after sending the IR bag carrying and reuse mark, receiving to indicate before stored decompression context reuses successful positive feedback, if receive negative feedback, carries the IR bag of reusing mark described in again sending to described sending module; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and current state is IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as the IR bag carrying and reuse mark after be sent to described sending module; If receive corresponding compressed context for described in the bag to be compressed of compressed context of reusing, and current state is non-IR state, then by the compressed context of described correspondence for described in the bag to be compressed of compressed context of reusing be encapsulated as dynamic part and initially refresh IR-DYN bag, or be encapsulated as the 2 type compressed packages that unidirectional mode, bidirectional optimistic mode and bidirectional reliable mode are general, then by packaged Packet Generation extremely described sending module.
11. compressor reducers as claimed in claim 10, is characterized in that:
Describedly do not belonged to unidirectional mode, bidirectional optimistic mode or bidirectional reliable mode by the compressed context used at most;
Described not identical from the framework type of this bag to be compressed or different by the compressed context used at most.
12. compressor reducers as claimed in claim 10, is characterized in that:
Described processing module, is in described IR bag, increase by a field reuse mark as described, or uses the existing field in IR bag to reuse mark as described.
13. compressor reducers as claimed in claim 10, is characterized in that:
Described processing module, finding out at most not by after the compressed context that uses, whether do not used more than a Preset Time by the compressed context used at most described in also judging, if, at most not by the compressed context used described in just reusing, if not, then the described bag to be compressed of compressed context compression of framework 0 type is used.
14. compressor reducers as claimed in claim 10, is characterized in that, described processing module reuse described in do not comprised by the compressed context that the compressed context that uses generates described bag to be compressed at most:
Described processing module uses multidate information in the multidate information of described bag to be compressed and this compressed context of static information initialization and static information, and it is not whether identical with the framework type belonging to described bag to be compressed by the compressed context used at most described in judging, if identical, at most not by the pattern information in the compressed context that uses described in then keeping, if not identical, be not then initialized as unidirectional mode by the pattern information in the compressed context that uses at most by described.
15. compressor reducers as claimed in claim 10, is characterized in that:
Described processing module also safeguard each compressed context of current existence corresponding reuse mark;
Mark of reusing corresponding for described compressed context of reusing, when reusing compressed context and generating the compressed context of described bag to be compressed, is also set to one first value by described processing module; And after sending the IR bag carrying and reuse mark, if when receiving to indicate stored decompression context to reuse successful positive feedback, then also mark of reusing corresponding for described compressed context of reusing is set to one second value;
Described processing module is also receiving negative feedback, or receive corresponding compressed context for described in reuse the bag to be compressed of compressed context time, corresponding the reusing of compressed context of reusing described in safeguarding according to it identifies and judges that current whether having received indicates stored decompression context to reuse successful positive feedback.
16. compressor reducers as claimed in claim 10, is characterized in that:
Cyclic redundancy check (CRC) code CRC is carried in described positive feedback;
Described processing module, after sending the IR bag carrying and reuse mark, if receive positive feedback, and to the CRC check success in described positive feedback, is just thought and is received to indicate stored decompression context to reuse successful positive feedback.
17. 1 kinds of decompressors, is characterized in that, comprise receiver module, processing module, wherein:
Described receiver module, receive one carry the initialization of reusing mark and refresh IR bag after, send it to described processing module;
Described processing module, obtains the Context identifier CID in described IR bag, finds out corresponding decompression context according to this CID, then refreshes described decompression context according to described IR bag;
Described decompression machine is made mistakes according to the cyclic redundancy check (CRC) code CRC check of carrying in compressed package or be have received not treatable compressed package, sends negative feedback to described compressor reducer;
The described processing module context that decompresses according to described IR initialization packet comprises:
Decompress described in the multidate information that described processing module uses described IR to wrap and static information initialization multidate information in context and static information, and whether judge that described IR wraps identical with the framework type belonging to described decompression context, if identical, then keep the pattern information in described decompression context, if not identical, then the pattern information in described decompression context is initialized as unidirectional mode.
18. decompressors as claimed in claim 17, is characterized in that:
Described processing module is successfully completed described decompression context initialization according to described IR bag, and after going out described IR bag according to the decompression context successful decompression after renewal, also sends the positive feedback of carrying cyclic redundancy check (CRC) code CRC.
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| CN101977402B (en) * | 2010-10-19 | 2015-04-01 | 中兴通讯股份有限公司 | Method and device for reusing context in robustness header compression |
| CN102300258B (en) * | 2011-08-26 | 2017-10-10 | 中兴通讯股份有限公司 | The method and system of content reusing |
| CN102457901B (en) * | 2011-12-22 | 2017-11-07 | 中兴通讯股份有限公司 | Robust header compression version adaptation method and device |
| CN102833785B (en) * | 2012-09-13 | 2014-09-17 | 武汉邮电科学研究院 | Method for reusing contexts of robust header compression system for mobile communication system |
| TWI656765B (en) * | 2017-06-01 | 2019-04-11 | 財團法人資訊工業策進會 | Transmission system and transmission method |
| CN111385263B (en) * | 2018-12-29 | 2022-05-24 | 大唐移动通信设备有限公司 | Method for maintaining data packet header compression information and communication equipment |
| US10817460B2 (en) | 2019-08-28 | 2020-10-27 | Advanced New Technologies Co., Ltd. | RDMA data sending and receiving methods, electronic device, and readable storage medium |
| CN110704361A (en) * | 2019-08-28 | 2020-01-17 | 阿里巴巴集团控股有限公司 | RDMA (remote direct memory Access) data transmitting and receiving method, electronic equipment and readable storage medium |
| CN111181688B (en) * | 2019-12-20 | 2021-02-12 | 翱捷科技股份有限公司 | ROHC compressor and implementation method thereof |
| CN111181936B (en) * | 2019-12-20 | 2020-11-03 | 翱捷科技股份有限公司 | ROHC system and implementation method thereof |
| CN118055446B (en) * | 2024-04-15 | 2024-06-18 | 上海移芯通信科技股份有限公司 | Robust header compression and decompression method, system and communication terminal |
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| US20080240439A1 (en) * | 2007-03-15 | 2008-10-02 | Interdigital Technology Corporation | Methods and apparatus to facilitate data and security context transfer, and re-initialization during mobile device handover |
| CN101594290B (en) * | 2008-05-26 | 2011-11-30 | 中兴通讯股份有限公司 | Processing method and device for compressing context identification by a robust head |
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| CN101848491A (en) * | 2010-04-21 | 2010-09-29 | 中兴通讯股份有限公司 | Mode converting method and device in robust header compression |
| CN101835196B (en) * | 2010-05-14 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for mode conversion in robust header compression |
| CN101977402B (en) * | 2010-10-19 | 2015-04-01 | 中兴通讯股份有限公司 | Method and device for reusing context in robustness header compression |
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