CN101494641A - Mode transition method and apparatus of robustness head compression technology - Google Patents
Mode transition method and apparatus of robustness head compression technology Download PDFInfo
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- CN101494641A CN101494641A CNA200810056649XA CN200810056649A CN101494641A CN 101494641 A CN101494641 A CN 101494641A CN A200810056649X A CNA200810056649X A CN A200810056649XA CN 200810056649 A CN200810056649 A CN 200810056649A CN 101494641 A CN101494641 A CN 101494641A
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Abstract
The invention provides a mode converting method and a mode converting device in a robust head compressing technique, wherein, the method comprises the following steps: a mode converting request message sent by a decompressing device is protected by a first timer; and a mode converting response message sent by a compressor is protected by a second timer. The mode converting method and the mode converting device use the timers to protect messages during the three-way handshake, thus lowering the procedure deadlock probability which is caused by the loss of mode transferring messages, improving the protocol compression efficiency and carrying out mode rollback in error situations.
Description
Technical field
The present invention relates to robustness head compression technology, particularly relate to mode conversion method and device in the robustness head compression technology.
Background technology
ROHC (robustness head compression technology) can be used to compressed IP/UDP/RTP heading, to improve Channel Transmission efficient.The ROHC agreement is described by the RFC3095 document of ITEF (the Internet engineering duty group), and in February, 2007 ITEF it is revised, the revision document be RFC4815.
Three kinds of operator schemes are provided in ROHC, be respectively: unidirectional mode (U-pattern), two-way optimistic pattern (O-pattern) and bidirectional reliable mode (R-pattern), having described three kinds of operator schemes in 5.6 joints of RFC3095 can change mutually, and the mode switch schematic diagram as shown in Figure 1.
In 3.1 of 5.6 joints of RFC3095 and RFC4815 saved, in order to optimize the mode switch flow process, agreement had been introduced two state variables at compressor side, is respectively: C_MODE (compressor reducer pattern variable) and C_TRANS (compressor state variable) in addition.The value of C_MODE is in that { among the R}, wherein, meaning of parameters is for U, O: U (UNIDIRECTIONAL, unidirectional mode), O (OPTIMISTIC, two-way optimistic pattern), R (RELIABLE, bidirectional reliable mode).The initial value of C_MODE is U.The value of C_TRANS is in that { P, among the D}, wherein, meaning of parameters is: P (Pending), D (Done).The initial value of C_TRANS is D.
Also introduced two state variables in the decompression machine side, be respectively: D_MODE (decompression machine pattern variable) and D_TRANS (decompression machine state variable).The value of D_MODE is in that { among the R}, initial value is U for U, O; The value of D_TARNS is in that { among the D}, initial value is D for I (Initiated), P.
The mode switch flow process of ROHC is initiated by the feedback message that decompression machine sends the band desired pattern, and in present agreement, except the U pattern is finished by a piece of news to the O mode switch, the conversion between other the pattern all adopts the mode of three-way handshake to finish.Initial, centre in the three-way handshake and end-state are all by above-mentioned state-variable description, and agreement is stipulated:
C_MODE and D_MODE represent the immediate status of compressor reducer and decompression machine;
Pending among the C_TRANS represents to receive the state exchange request feedback message of desired pattern (promptly with) of decompression machine;
Done among the C_TRANS represents that compressor side mode switch flow process finishes;
Initiated among the D_TRANS represents that this moment, decompression machine was initiated mode switch request;
Pending among the D_TRANS represents that the mode switch request that decompression machine has received that compressor reducer sends responds;
Done among the D_TRANS represents that decompression machine side form formula flow path switch finishes;
When C_TRANS=P:
1) compressor reducer uses the public message format of all patterns;
2) pattern information is included in the message of transmission and sends, and is periodic at least;
3) compressor reducer can not be moved to SO (Second Order, secondary compression) state;
4) ignore new mode switch request;
For decompression machine:
1) has only and when D_TRANS=D, could initiate mode switch operation;
2) when D_TRANS=I, decompression machine receives that to each message sends NACK or the ACK of band CRC (CRC);
3) when D_TRANS=P, decompression machine can adopt sparse feedback mechanism, but need continue to send feedback according to some cycles, and all will be with CRC;
Fig. 2 is the transfer process of O pattern to the R pattern.
Among Fig. 2,, just still be trapped in the Initial state as long as decompression machine does not receive that the mode switch parameter is set to the UOR-2 of R, IR-DYN or IR message.When C_TRANS was P, compressor reducer can not send 0 type or 1 type message, also promptly all can not send 0,1 type message before the ACK that receives UOR-2, IR-DYN that the mode switch parameter is R or IR message.If decompression machine ACK behind UOR-2, IR-DYN or the IR message, receive 0 type or 1 type message, it is D that D_TRANS could be set, flow process finishes.
The U pattern is identical to the flow process of R pattern with the O pattern to the flow path switch of R pattern.
Fig. 3 is the conversion process of R pattern to the O pattern:
As long as decompressor does not receive UOR-2, IR-DYN or the IR message that the mode switch parameter is set to O, then continue to remain on the Initial state.When C_TRANS was P, compressor reducer can not send 0 type or 1 type message, also promptly before receiving that the mode switch parameter is the ACK message of UOR-2, the IR-DYN of O or IR message, can not send 0 type or 1 type message.If decompression machine ACK behind UOR-2, IR-DYN or the IR message, receive 0 type or 1 type message, it is D that D_TRANS could be set.In the transfer process, compressor reducer must remain on FO (First Order, one-level compression) state.
Fig. 4 is the flow path switch that R pattern, O pattern arrive the U pattern.
At first UOR-2 of decompression machine ACK (U), IR-DYN (U) or IR (U), also be that decompression machine must continue the feedback that sending mode is U after the response of decompression machine ACK mode switch request, up to receiving 0 type or 1 type message.
In order to prevent that feedback message is lost the deadlock that causes in the mode switch flow process three-way handshake process, stipulated also in the agreement that when C_TRANS is P pattern information is included in the message of transmission and sends, be periodic (being the IR/IR-DYN/UOR-2 message) at least; When D_TRANS was P, decompression machine needn't be that each message of receiving sends feedback, but must send the feedback (promptly among the figure last ACK message) of band CRC according to some cycles continuously.
But such processing, first has reduced compression efficiency, and second makes the compressor reducer and the decompression machine that participate in mode switch not know carry out rolling back action when.
Summary of the invention
The purpose of this invention is to provide mode conversion method and device in a kind of robustness head compression technology, solve in the three-way handshake flow process of prior art, the sender of the message does not know the inherent defect that message may have been lost, solve not high and the problem that can't rollback of efficient in the prior art, reduced the probability of flow process deadlock simultaneously.
To achieve these goals, the invention provides the mode conversion method in a kind of robustness head compression technology, wherein, comprising: initiate message for the mode switch that decompression machine sends, first timer protection is set; Mode switch request response message for compressor reducer sends is provided with second timer protection.
Above-mentioned method, wherein, the described first timer that is provided with is protected specifically and is comprised: if described decompression machine is received described mode switch request response message before described first timer is overtime, then stop described first timer; If described first timer is overtime, then roll back to original pattern.
Above-mentioned method, wherein, the described second timer that is provided with is protected specifically and is comprised: if described compressor reducer is received the secondary acknowledge message that described decompression machine sends before described second timer is overtime, then stop described second timer; If the described compressor reducer in the overtime back of described second timer is not received described secondary acknowledge message yet, then retransmit described mode switch request response message.
Above-mentioned method wherein, also comprises: the maximum number of times of transmission of described mode switch request response message is set, if the transmission number of times of described mode switch request response message surpasses described maximum number of times of transmission, then rolls back to original pattern.
Above-mentioned method wherein, also comprises: for the secondary acknowledge message that described decompression machine sends, the 3rd timer is set protects.
Above-mentioned method wherein, if described decompression machine is received 0 type or the 1 type message of target pattern before described the 3rd timer expiry, then stops described the 3rd timer; If described the 3rd timer expiry is then retransmitted described secondary acknowledge message.
Above-mentioned method wherein, also comprises: the transmission number of times thresholding of described secondary acknowledge message is set, if the transmission number of times of described secondary acknowledge message surpasses described thresholding, then alarms.
Above-mentioned method, wherein, described original pattern is described decompression machine residing pattern before sending described mode switch initiation message.
To achieve these goals, the present invention also provides the mode conversion device in a kind of robustness head compression technology, wherein, comprising: first timer, the mode switch that is used for that decompression machine is sent are initiated message and are protected; Second timer is used for the mode switch request response message that compressor reducer sends is protected.
Above-mentioned device wherein, also comprises: the 3rd timer, the secondary acknowledge message that is used for described decompression machine is sent is protected.
Technique effect of the present invention is:
Compare with existing procedure, the message of the present invention by to three-way handshake the time is carried out the timer protection, has reduced the probability that pattern migration information drop-out causes the flow process deadlock, has improved the agreement compression efficiency, and can carry out the pattern rollback under error situation.
Description of drawings
Fig. 1 is the mode switch schematic diagram of prior art;
Fig. 2 is the schematic diagram of prior art O pattern to the flow path switch of R pattern;
Fig. 3 is the schematic diagram of prior art R pattern to the flow path switch of O pattern;
Fig. 4 is the schematic diagram of prior art to the flow path switch of U pattern;
Fig. 5 is the flow chart of steps of the inventive method;
Fig. 6 is the schematic diagram of the O pattern of enhancing provided by the invention to the flow path switch (normal flow) of R pattern;
Fig. 7 is the schematic diagram of the conversion to the U pattern provided by the invention (normal flow).
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is protected with timer important message on the basis of the three-way handshake flow process of former protocol description.Decision message is lost in the time of timer expiry, and the sender of the message just can reasonably protect according to this, such as rolling back action, can reduce part flow process deadlock probability like this; For original periodically message of transmission that needs, adopt the protection of timer and maximum number of retransmissions, improved flow path efficiency, avoid unconfined wait.
Fig. 5 is the inventive method flow chart of steps, and as figure, the inventive method comprises:
Optionally, also comprise step 403,, the 3rd timer is set protects for the secondary acknowledge message that described decompression machine sends.
The flow path switch of U pattern to the O pattern do not contained in the present invention.
Be example with the O pattern to the pattern migration flow process of R pattern below, mode switch flow process such as Fig. 6 of enhancing.
The mode switch that the present invention sends for decompression machine is initiated message (carrying the feedback message of desired pattern, band CRC option), is protected with timer Timer_D_1 (first timer); For the mode switch request response message (IR/IR-DYN/UOR-2 (SN, target pattern) message) of compressor reducer, protected with timer Timer_C_1 (second timer); For the secondary acknowledge message (ACK (SN, target pattern) message) that decompression machine sends, protected (optional) with timer Timer_D_2 (the 3rd timer).Simultaneously, the transmission number of times of IR/IR-DYN/UOR-2 (SN, target pattern) message need carry out certain limitation, and it is N_C that maximum number of times of transmission is set, and the size of this value depends on realization, and is relevant with the RTT time of channel.After Timer_C_1 is overtime, can retransmit.Transmission number of times to ACK (SN, target pattern) message also carries out certain limitation, and it is N_D that maximum number of times of transmission is set.
Idiographic flow is as follows:
The first step: D_TRANS=D satisfies the necessary condition of initiating mode switch, and decompression machine is by sending the feedback message initiation pattern migration flow process of band desired pattern parameter.After sending this message, start timer Timer_D_1, D_TRANS is set to I;
Second step: after compressor reducer was received this request, C_TRANS was set to P, and C_MODE is set to target pattern.And send current context information so that decompression machine makes up its decompress(ion) environment (by IR/IR-DYN/UOR-2 (SN, target pattern) message), start timer Timer_C_1 then;
The 3rd step: decompression machine is received the context message (IR/IR-DYN/UOR-2 (SN that newly arrives, target pattern) message), it is P that D_TRANS is set, D_MODE is that target pattern is (for the flow path switch to the U pattern, this variable is in the 5th step assignment), and fed back, ACK (SN sent, target pattern), optionally start timer Timer_D_2;
The 4th step: after compressor reducer was received ACK (SN, target pattern) message, it was target pattern that C_MODE is set.So far, the compressor side flow process finishes;
The 5th step: compressor reducer begins according to 0 type or 1 type message under the new model transmission target pattern, and after decompression machine was received this class message, it was D that D_TRANS is set, and flow process finishes.
In the above-mentioned flow process,, then stop Timer_D_1 if decompression machine has been received IR/IR-DYN/UOR-2 (SN, target pattern) message before Timer_D_1 is overtime; If compressor reducer is not received ACK (SN, target pattern) message yet after Timer_C_1 is overtime, then can retransmit IR/IR-DYN/UOR-2 (SN, target pattern) message, but can not be above N_C time.If before Timer_C_1 is overtime, received ACK (SN, target pattern) message, then stopped Timer_C_1; If decompression machine has been received 0 type or the 1 type message of target pattern before Timer_D_2 (optional) is overtime, then stop Timer_D_2.
If overtime N_C time or Timer_D_1 of Timer_C_1 is overtime, can roll back to original pattern.Except other flow process to the conversion of U pattern, if Timer_D_2 (optional) is overtime, the suggestion alarm, but not rollback state, because possible upper strata and free of data send, for the flow process to the U mode switch, the Timer_D_2 timer is default, because ACK is (SN, U) message might can't send to compressor reducer, but it is long that this timer need be provided with, and after each Timer_D_2 is overtime, retransmits ACK (SN, U), retransmit still overtime after N_D time (not receiving 0,1 type message of U pattern), then report an error, avoid deadlock.
To be that example describes to the U mode switch, flow process such as Fig. 7 comprise below:
The first step: decompression machine determines to the U mode switch, sends band ACK (U) or NACK (U), and feedback band CRC option starts timer Timer_D_1, puts D_TRANS=I;
Second step: compressor reducer if CRC check is passed through, then is provided with C_TRANS=P after receiving ACK (U) or NACK (U), C_MODE=U, and (SN, U) message start timer Timer_C_1, and N_C adds 1 to send IR/IR-DYN/UOR-2 to compressor reducer;
The 3rd step: decompression machine receive IR/IR-DYN/UOR-2 (SN, U) after, stop Timer_D_1, put D_TRASN=P, send the ACK (U) of band CRC, start timer Timer_D_2, N_D adds 1;
The 4th step: compressor reducer if CRC check is passed through, stops Timer_C_1 after receiving ACK (U), and N_C resets, and C_TRANS=D is set.N_C resets.So far the compressor side flow process finishes, and both sides' context is finished synchronously, according to new context, sends UO-0 or UO-1* message;
The 5th step: decompression machine stops timer Timer_D_2 after receiving UO-0 or UO-1* message, puts D_TRANS=D, D_MODE=U, and the N_D that resets, so far decompression machine effluent journey finishes.
Abnormal conditions (depending on realization):
Overtime as Timer_D_1, expression mode switch request ACK (U)/NACK (U) may lose or the other side's IR/IR-DYN/UOR-2 (SN U) loses, and then the decompression machine flow process stops, state rollback, D_TRANS=D;
When Timer_C_1 overtime, expression IR/IR-DYN/UOR-2 (SN, U) lose or the other side's ACK (SN U) loses, if N_C surpasses maximum number of times of transmission, then send out again IR/IR-DYN/UOR-2 (SN, U).If surpass maximum number of times of transmission, the compressor reducer flow process stops, the state rollback;
When Timer_D_2 overtime, expression ACK (SN U) loses or follow-up data bag UO-0/UO-1* loses or long-term free of data, if N_D surpasses maximum number of times of transmission, then send out again ACK (SN, U).If surpass maximum number of times of transmission, the compressor reducer flow process stops, and reports unusual.
For conversion to the conversion of R pattern and R pattern to the O pattern, new handling process and above-mentioned to the U mode class seemingly difference is that timer Timer_D_2 is optional, and the difference of flow process message and some state variable come into force different.
In addition, corresponding the inventive method, the present invention also provides the mode conversion device in a kind of robustness head compression technology, comprising: first timer, the mode switch that is used for that decompression machine is sent are initiated message and are protected; Second timer is used for the mode switch request response message that compressor reducer sends is protected; Optional the 3rd timer, the secondary acknowledge message that is used for described decompression machine is sent is protected.Wherein, first timer, the 3rd timer can be arranged on decompression machine, and second timer can be arranged on compressor reducer.
As from the foregoing, the present invention has following advantage:
Adopt mode switch provided by the invention to strengthen flow process; compare with existing procedure, the message by to three-way handshake the time is carried out the timer protection, has reduced the probability that pattern migration information drop-out causes the flow process deadlock; improve the agreement compression efficiency, and can under error situation, carry out the pattern rollback.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the mode conversion method in the robustness head compression technology is characterized in that, comprising:
Initiate message for the mode switch that decompression machine sends, first timer protection is set;
Mode switch request response message for compressor reducer sends is provided with second timer protection.
2. method according to claim 1, it is characterized in that, the described first timer that is provided with is protected specifically and is comprised: if described decompression machine is received described mode switch request response message before described first timer is overtime, then stop described first timer; If described first timer is overtime, then roll back to original pattern.
3. method according to claim 1, it is characterized in that, the described second timer that is provided with is protected specifically and is comprised: if described compressor reducer is received the secondary acknowledge message that described decompression machine sends before described second timer is overtime, then stop described second timer; If the described compressor reducer in the overtime back of described second timer is not received described secondary acknowledge message yet, then retransmit described mode switch request response message.
4. method according to claim 3, it is characterized in that, also comprise: the maximum number of times of transmission of described mode switch request response message is set,, then rolls back to original pattern if the transmission number of times of described mode switch request response message surpasses described maximum number of times of transmission.
5. according to any described method in the claim 1 to 4, it is characterized in that, also comprise:
For the secondary acknowledge message that described decompression machine sends, the 3rd timer is set protects.
6. method according to claim 5 is characterized in that, if described decompression machine is received 0 type or the 1 type message of target pattern before described the 3rd timer expiry, then stops described the 3rd timer; If described the 3rd timer expiry is then retransmitted described secondary acknowledge message.
7. method according to claim 6 is characterized in that, also comprises: the transmission number of times thresholding of described secondary acknowledge message is set, if the transmission number of times of described secondary acknowledge message surpasses described thresholding, then alarms.
8. method according to claim 4 is characterized in that, described original pattern is described decompression machine residing pattern before sending described mode switch initiation message.
9. the mode conversion device in the robustness head compression technology is characterized in that, comprising:
First timer, the mode switch that is used for that decompression machine is sent are initiated message and are protected;
Second timer is used for the mode switch request response message that compressor reducer sends is protected.
10. device according to claim 9 is characterized in that, also comprises:
The 3rd timer, the secondary acknowledge message that is used for described decompression machine is sent is protected.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101835196A (en) * | 2010-05-14 | 2010-09-15 | 中兴通讯股份有限公司 | Method and device for mode conversion in robust header compression |
| 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 |
| 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 |
| CN111092844A (en) * | 2018-10-23 | 2020-05-01 | 瑞昱半导体股份有限公司 | Method for performing mode conversion of compression operation, and transmission apparatus |
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2008
- 2008-01-23 CN CNA200810056649XA patent/CN101494641A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| WO2011131007A1 (en) * | 2010-04-21 | 2011-10-27 | 中兴通讯股份有限公司 | Method and apparatus for mode transition, compression, and decompression in robust header compression |
| EP2509274A1 (en) * | 2010-04-21 | 2012-10-10 | ZTE Corporation | Method and apparatus for mode transition, compression, and decompression in robust header compression |
| EP2509274A4 (en) * | 2010-04-21 | 2013-11-13 | Zte Corp | Method and apparatus for mode transition, compression, and decompression in robust header compression |
| US8761197B2 (en) | 2010-04-21 | 2014-06-24 | Zte Corporation | Method and apparatus for mode transition, compression, and decompression in robust header compression |
| CN101835196A (en) * | 2010-05-14 | 2010-09-15 | 中兴通讯股份有限公司 | Method and device for mode conversion in robust header compression |
| WO2011140809A1 (en) * | 2010-05-14 | 2011-11-17 | 中兴通讯股份有限公司 | Method, device and system for mode transition 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 |
| 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 |
| CN102215236B (en) * | 2011-06-13 | 2017-02-08 | 中兴通讯股份有限公司 | Working mode switching method and device of robust header compression protocol (ROHC) layer |
| CN111092844A (en) * | 2018-10-23 | 2020-05-01 | 瑞昱半导体股份有限公司 | Method for performing mode conversion of compression operation, and transmission apparatus |
| CN111092844B (en) * | 2018-10-23 | 2023-12-01 | 瑞昱半导体股份有限公司 | Method for performing mode conversion of compression operation and transmission device |
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Application publication date: 20090729 |