CN101262326A - De-multiplexing method and de-multiplexer for improving error tolerance in mobile multimedia broadcast system - Google Patents
De-multiplexing method and de-multiplexer for improving error tolerance in mobile multimedia broadcast system Download PDFInfo
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Abstract
The invention discloses a de-multiplexing method for improving fault tolerance of a mobile multimedia broadcast system and a de-multiplexing device thereof, applicable to a mobile multimedia broadcast system which multiplexes data according to CMMB standard of China Mobile Multimedia Broadcasting. The method comprises the following steps: when a multiplex frame is being de-multiplexed and if the check of the head of the multiplex frame fails, de-multiplexing is tried to be carried out according to two or one of the two fields, namely, length of the head of the multiplex frame and number of multiplex subframe in the head of the multiplex frame; if the try succeeds, the de-multiplexing is carried on, otherwise, data at the second is discarded. The technical proposal of the invention increases fault tolerance processing of the head of the frame during de-multiplexing, which can recover more losses caused by transmission errors, reduce discard of error data and improve audience rating quality at the terminal. The prioritization scheme of the invention has the ability of fault tolerance processing of the head of multiplex subframe and can further reduce probability of discarding data. The prioritization scheme of the invention can further improve fault tolerance efficiency or reduce fault tolerance processing logic.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to improve in a kind of mobile multimedia broadcast system fault-tolerant Deplexing method and demodulation multiplexer.
Background technology
In CMMB (China Mobile multimedia broadcasting) system, each channel (Service) sends a broadcast channel frame each second, and this broadcast channel frame comprises a plurality of multiplexed frames; Audio frequency and video and other data of needs broadcasting are multiplexed into a frame according to standard, are transferred to terminal.Terminal is reduced into audio frequency through demultiplexing, and video and data show again.
Each multiplexed frame is made of frame head and one or more subframe; Each subframe is made of subframe head and audio frequency, video and/or data segment; Audio section is made of audio frequency paragraph header and one or more audio unit; Video-frequency band is made of video paragraph header and video unit; Data segment is made of data segment header and data cell.
In wireless environment, error code can occur in any one position of frame.Frame head, what subframe head and each paragraph header were preserved is key message, all has the verification of CRC32 (32 cyclic redundancy check (CRC) code).In case error code appears in these information, will influence whole one second data.Such as, when demultiplexing, if frame head verification failure can all abandon all the elements of this second in the existing method.A subframe verification failure, in general this of this subframe second content also can only be dropped.If content is dropped, stagnating and mosaic will appear in audio/video program, and data are dropped the integrality and the real-time that will influence data.
Summary of the invention
The technical problem to be solved in the present invention provides fault-tolerant Deplexing method and the demodulation multiplexer of raising in a kind of mobile multimedia broadcast system, be applicable to the mobile multimedia broadcast system that carries out data multiplex according to China Mobile multimedia broadcasting CMMB standard, when demultiplexing, carry out certain fault-tolerant processing, can reduce the probability that data are dropped.
In order to solve the problems of the technologies described above, the invention provides the fault-tolerant Deplexing method of raising in a kind of mobile multimedia broadcast system, be applicable to the mobile multimedia broadcast system that carries out data multiplex according to China Mobile multimedia broadcasting CMMB standard, comprising:
When multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head to carry out trial solution multiplexing, if success then continue demultiplexing; Otherwise abandon this second data.
Further, described verification is a cyclic redundancy check (CRC).
Further, described Deplexing method can also comprise:
If arbitrary multiplexed sub frame head verification failure supposes that then the value of header length field in the multiplexed sub frame head is correct, first section trial that navigates to behind the subframe head is carried out demultiplexing to it, if paragraph header is carried out verification succeeds, then continues demultiplexing; , verification abandons the data of this second if failing;
First section behind the described subframe head is any in data segment, audio section and the video-frequency band.
Further, describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing to be meant:
Judge earlier whether multiplex frame head length and multiplexed sub frame are counted these two fields correct, if correctly then continue demultiplexing; If wherein any is correct and trial solution is multiplexing for incorrect then hypothesis, if success then continue demultiplexing; If failure then suppose that in described two fields another is correct and trial solution is multiplexing, if success then continue demultiplexing, if failure then abandon this second data.
Further, described Deplexing method specifically comprises:
A, multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then carry out step B;
B, check that multiplex frame head length and multiplexed sub frame in the multiplex frame head counts the value of these two fields and whether mate, if do not match then carry out step C; Coupling then navigates to multiplexed sub frame by original multiplex frame head length and multiplexed sub frame number and proceeds next step demultiplexing;
C, suppose that any field in multiplexed sub frame number and the multiplex frame head length is correct, extrapolate the value of the correct field of non-hypothesis, trial solution is multiplexing then, if the subframe head of first multiplexed sub frame is carried out verification succeeds, the value of above-mentioned two fields continues demultiplexing during then by trial; Otherwise suppose that in two fields another is for correct, extrapolate the value of not supposing correct field, trial solution is multiplexing then, if the subframe head of first multiplexed sub frame is carried out verification succeeds, the value of above-mentioned two fields continues demultiplexing during then by trial, otherwise abandons the data of this second.
Further, among the step B, the length of described multiplex frame head and multiplexed sub frame are counted these two fields match and are meant that the value of these two fields meets following particular kind of relationship:
Multiplex frame head length is that the total length of fixed-length field in the multiplexed frame head information adds the multiplexed sub frame number and the sum of products corresponding to the header information length of a multiplexed sub frame;
Among the step C, extrapolate the value of the correct field of non-hypothesis by above-mentioned particular kind of relationship.
Further, among the step C, described trial solution is multiplexing to be meant:
Navigate to multiplexed sub frame according to multiplex frame head length, attempt first multiplexed sub frame is carried out demultiplexing; When hypothesis multiplex frame head length is correct, navigate to multiplexed sub frame according to the correct multiplex frame head length of this hypothesis; When hypothesis multiplexed sub frame number is correct, navigate to multiplexed sub frame according to the multiplex frame head length of extrapolating.
Further, describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing to be meant:
The value of supposing multiplex frame head length is correct, and trial solution is multiplexing; If the success would continue demultiplexing; If failure then abandon the data of this second.
Further, described Deplexing method specifically comprises:
A, multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then carry out step b;
B, suppose that the value of multiplex frame head length field in the multiplex frame head is correct, trial solution is multiplexing then; If the subframe head to first multiplexed sub frame carries out verification succeeds, then continue demultiplexing; , verification abandons the data of this second if failing.
Further, among the step b, described trial solution is multiplexing to be meant:
Navigating to multiplexed sub frame according to described multiplex frame head length attempts first multiplexed sub frame is carried out demultiplexing.
Improve fault-tolerant demodulation multiplexer in a kind of mobile multimedia broadcast system, be applicable to the mobile multimedia broadcast system that carries out data multiplex according to the CMMB standard, comprise the demultiplexing module that is used for received multiplexed frame is carried out successively demultiplexing; Also comprise: the fault-tolerant processing module;
Described demultiplexing module is used for also will comprising at least that the multiplexed frame head information of multiplex frame head length and/or multiplexed sub frame number sends to described fault-tolerant processing module when multiplexed frame head information checking is failed; Also be used to receive the continuation indication back continuation demultiplexing of fault-tolerant processing module; Also be used to receive the data of abandoning abandoning after indicating current this second of fault-tolerant processing module;
Described fault-tolerant processing module is used for after receiving described multiplexed frame head information counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame, and to carry out trial solution multiplexing, if success then send and continue indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
Further, described demultiplexing module also is used for after abandoning the data of this second the data that next second received being carried out demultiplexing.
Further, described demultiplexing module also is used for when arbitrary multiplexed sub frame head verification is failed, and the value that sends header length field in the multiplexed sub frame head is to described fault-tolerant processing module;
Described fault-tolerant processing module also is used for after receiving the value of described header length field, and first section trial that navigates to behind the subframe head is carried out demultiplexing to it, if paragraph header is carried out verification succeeds, sends and continues indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
It is in data segment, audio section and the video-frequency band any that described fault-tolerant processing module navigates to first section behind the subframe head.
Further, described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing to be meant:
The fault-tolerant processing module judges earlier whether multiplex frame head length and multiplexed sub frame are counted these two fields correct, if correctly then send and continue to indicate to described demultiplexing module; If wherein any is correct and trial solution is multiplexing for incorrect then hypothesis, if successful then transmission continues indication to described demultiplexing module, if failure then suppose that in described two fields another is correct and trial solution is multiplexing, if success then send and continue indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
Further, described fault-tolerant processing module further comprises:
Judge submodule and attempt submodule;
After described judgement submodule is used to receive described multiplexed frame head information, check that multiplex frame head length and multiplexed sub frame count the value of these two fields and whether mate, if coupling then send and continue indication to described demultiplexing module; Otherwise transmission work is indicated to described trial submodule;
Described trial submodule is used for receiving that any of hypothesis multiplexed sub frame number and these two fields of multiplex frame head length is correct earlier in the work indication back of judging submodule, and extrapolates the value of the correct field of non-hypothesis, and trial solution is multiplexing then; If successful then transmission continues indication to described demultiplexing module, carry the value of above-mentioned two fields when attempting in the described continuation indication, otherwise suppose that in two fields another is correct, and extrapolate the value of the correct field of non-hypothesis, trial solution is multiplexing then, if successful then transmission continues indication to described demultiplexing module, the value of above-mentioned two fields when carrying trial in the described continuation indication, otherwise transmission is abandoned indication to described demultiplexing module.
Described demultiplexing module is used for receiving the continuation indication back of judging submodule and continues demultiplexing by original multiplex frame head length of multiplexed frame head information and multiplexed sub frame number; After receiving the continuation indication of attempting submodule, continue demultiplexing according to multiplex frame head length of carrying in this indication and multiplexed sub frame number.
Further, describedly judge submodule checks it is whether the value of these two fields of digital examination meets following particular kind of relationship that multiplex frame head length and multiplexed sub frame count whether the value of these two fields mate:
Multiplex frame head length is that the total length of fixed-length field in the multiplexed frame head information adds the multiplexed sub frame number and the sum of products corresponding to the header information length of a multiplexed sub frame;
Described trial submodule is further used for extrapolating by above-mentioned particular kind of relationship the value of the correct field of non-hypothesis.
Further, multiplexing being meant of described trial submodule trial solution:
Attempt submodule and navigate to multiplexed sub frame, attempt first multiplexed sub frame is carried out demultiplexing according to multiplex frame head length; When hypothesis multiplex frame head length was correct, the multiplex frame head length correct according to this hypothesis navigated to multiplexed sub frame; When hypothesis multiplexed sub frame number is correct, navigate to multiplexed sub frame according to the multiplex frame head length of extrapolating;
Described trial submodule trial solution is multiplexing successfully to be meant: the subframe head to first multiplexed sub frame behind the trial submodule demultiplexing carries out verification succeeds.
Further, described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing to be meant:
The value of fault-tolerant processing module hypothesis multiplex frame head length is correct, and trial solution is multiplexing; If successful then transmission continues indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
Further, multiplexing being meant of described fault-tolerant processing module trial solution:
Described fault-tolerant processing module navigates to multiplexed sub frame according to described multiplex frame head length and attempts first multiplexed sub frame is carried out demultiplexing;
Described fault-tolerant processing module trial solution is multiplexing successfully to be meant: the subframe head to first multiplexed sub frame behind the fault-tolerant processing module demultiplexing carries out verification succeeds.
Technical scheme of the present invention increases fault-tolerant processing to frame head when demultiplexing, can more retrieve the loss that causes because of transmission error code, and reduction abandons the error code data, thereby improves the rating quality of terminal.Prioritization scheme of the present invention possesses the fault-tolerant processing to the multiplexed sub frame head, can further reduce the probability that data are dropped.Prioritization scheme of the present invention can also further improve fault-tolerant efficient, or reduces the fault-tolerant processing logic.
Description of drawings
Fig. 1 is the concrete implementing procedure figure that improves one of fault-tolerant Deplexing method in the mobile multimedia broadcast system of the present invention;
Fig. 2 is two the concrete implementing procedure figure that improves fault-tolerant Deplexing method in the mobile multimedia broadcast system of the present invention;
Fig. 3 is the concrete enforcement block diagram that improves fault-tolerant demodulation multiplexer in the mobile multimedia broadcast system of the present invention;
Fig. 4 is the concrete enforcement block diagram that improves fault-tolerant fault-tolerant processing module in the mobile multimedia broadcast system of the present invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
The present invention is based on following design: the audio/video decoding module has fault-tolerant ability usually in the prior art, has in audio-video code stream under the situation of error of transmission, can make wrong caused influence minimum; Therefore even frame head/subframe head has error code, only otherwise influence demultiplexing, just there is no need to abandon the data of this second, but reservation as far as possible under possible situation.
The invention provides the fault-tolerant Deplexing method of raising in a kind of mobile multimedia broadcast system, be applicable to the mobile multimedia broadcast system that carries out data multiplex according to the CMMB standard, comprising:
When multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head to carry out trial solution multiplexing, if success then continue demultiplexing; Otherwise abandon this second data.
Described verification can be that cyclic redundancy check method (CRC) or other have the method for calibration of error correcting capability.
Further, this method can also comprise:
If arbitrary multiplexed sub frame head verification failure supposes that then the value of header length field in the multiplexed sub frame head is correct, first section trial that navigates to behind the subframe head is carried out demultiplexing to it, if paragraph header is carried out verification succeeds, then continues demultiplexing; , verification abandons the data of this second if failing.
First section behind the described subframe head may be any in data segment, audio section and the video-frequency band.
Further, this method can also comprise:
After abandoning the data of this second, the data that next second received are continued demultiplexing.
Describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing can be meant:
Judge earlier whether multiplex frame head length and multiplexed sub frame are counted these two fields correct, if correctly then continue demultiplexing; If wherein any is correct and trial solution is multiplexing for incorrect then hypothesis, if success then continue demultiplexing; If failure then suppose that in described two fields another is correct and trial solution is multiplexing, if success then continue demultiplexing, if failure then abandon this second data.
When adopting this implementation, said method specifically may further comprise the steps as shown in Figure 1:
A, multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then carry out step B.
B, check that multiplex frame head length and multiplexed sub frame in the multiplex frame head counts the value of these two fields and whether mate (in other words not contradiction); If do not match then carry out step C; Coupling can suppose that then the error code of frame head occurs in other parts, counts these two fields by original multiplex frame head length and multiplexed sub frame and navigates to multiplexed sub frame and proceed next step demultiplexing.
Head in the multiplex frame head comprises two parts, and a part is the field of regular length, wherein comprises multiplex frame head length and multiplexed sub frame number at least; Another part is the locating information field corresponding to each multiplexed sub frame, and this part length is relevant with the number of multiplexed sub frame.Hence one can see that, and there is a particular kind of relationship in the inevitable and multiplexed sub frame number of the length of multiplex frame head: the total length that should be fixed-length field in the multiplexed frame head information adds the multiplexed sub frame number and the sum of products corresponding to the length of the header information length of a multiplexed sub frame length.The value coupling that the length of described multiplex frame head and multiplexed sub frame are counted these two fields is meant between the value of these two fields and meets above-mentioned particular kind of relationship.
Navigate to multiplexed sub frame carry out the implementation method of next step demultiplexing can same prior art.
In C, elder generation's hypothesis multiplexed sub frame number and the multiplex frame head length any is correct, extrapolate the value of the correct field of non-hypothesis according to above-mentioned particular kind of relationship, trial solution is multiplexing then, if the subframe head to first multiplexed sub frame carries out verification succeeds, then hypothesis is set up, and the value of above-mentioned two fields continues demultiplexing during by trial.Otherwise carry out step D.
D, suppose in multiplexed sub frame number and the multiplex frame head length another for correct, and extrapolate the value of not supposing correct field according to above-mentioned particular kind of relationship, trial solution is multiplexing then; If the subframe head to first multiplexed sub frame carries out verification succeeds, then hypothesis is set up, and the value of above-mentioned two fields continues demultiplexing during by trial.Otherwise abandon the data of this second.
Described trial solution is multiplexing to be meant: navigate to multiplexed sub frame according to multiplex frame head length, attempt first multiplexed sub frame is carried out demultiplexing.When hypothesis multiplex frame head length is correct, navigate to multiplexed sub frame according to the correct multiplex frame head length of this hypothesis exactly; When hypothesis multiplexed sub frame number is correct, navigate to multiplexed sub frame according to the multiplex frame head length of extrapolating exactly.
Describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing also can be meant:
It is correct and trial solution is multiplexing to suppose that multiplex frame head length and multiplexed sub frame in the multiplex frame head are counted in these two fields any, if success then continue demultiplexing; If failure then suppose that in described two fields another is correct and trial solution is multiplexing; If the success would continue demultiplexing, if the failure would abandon this second data.
This implementation is the method that goes up after a kind of implementation reduction, does not judge the relation of two fields and directly supposes.Like this from the single demultiplexing, realize comparatively simple in logic, but as a whole, if the error code of most of frame head is not to occur in this two fields, adopt the efficient that goes up a kind of mode higher so, as long as judge that two fields match just can continue demultiplexing, and need not carry out subsequent step.
This implementation can also further be reduced into following implementation.
Describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing to be meant: the value of supposing multiplex frame head length is correct, and trial solution is multiplexing; If the success would continue demultiplexing; If failure then abandon the data of this second.
The ability of this implementation save data a little less than, fault-tolerant ability is lower in other words.But from single demultiplexing angle, realize that logic is very simple, can simplified design, reduce cost, and have certain fault-tolerant ability.
When adopting this implementation, described method specifically comprises the steps: as shown in Figure 2
A, multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then carry out step b.
B, suppose that the value of multiplex frame head length field in the multiplex frame head is correct, trial solution is multiplexing then; If the subframe head to first multiplexed sub frame carries out verification succeeds, then continue demultiplexing; , verification abandons the data of this second if failing.
Described trial solution is multiplexing to be meant that navigating to multiplexed sub frame according to described multiplex frame head length attempts first multiplexed sub frame is carried out demultiplexing.
The present invention also provides the fault-tolerant demodulation multiplexer of raising in a kind of mobile multimedia broadcast system, is applicable to the mobile multimedia broadcast system that carries out data multiplex according to the CMMB standard, as shown in Figure 3, comprising: demultiplexing module and fault-tolerant processing module.
Described demultiplexing module is used for the received multiplexed frame of receiving terminal is carried out demultiplexing successively and exports to decoder; Be used for also when multiplexed frame head information checking is failed, will comprising at least that the multiplexed frame head information of multiplex frame head length and/or multiplexed sub frame number sends to described fault-tolerant processing module; Also be used to receive the continuation indication back continuation demultiplexing of fault-tolerant processing module; Also be used to receive the data of abandoning abandoning after indicating current this second of fault-tolerant processing module.
Described fault-tolerant processing module is used for after receiving described multiplexed frame head information counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame, and to carry out trial solution multiplexing, if success then send and continue indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
Further, described demultiplexing module also is used for after abandoning the data of this second the data that next second received being carried out demultiplexing.
Further, described demultiplexing module also is used for when arbitrary multiplexed sub frame head verification is failed, and the value that sends header length field in the multiplexed sub frame head is to described fault-tolerant processing module.
Described fault-tolerant processing module also is used for after receiving the value of described header length field, and first section trial that navigates to behind the subframe head is carried out demultiplexing to it, if paragraph header is carried out verification succeeds then send continuing indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
It may be in data segment, audio section and the video-frequency band any that described fault-tolerant processing module navigates to first section behind the subframe head.
Described verification is meant that cyclic redundancy check method (CRC) or other have the method for calibration of error correcting capability.
Described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing to be meant:
The fault-tolerant processing module judges earlier whether multiplex frame head length and multiplexed sub frame are counted these two fields correct, if correctly then send and continue to indicate to described demultiplexing module; If wherein any is correct and trial solution is multiplexing for incorrect then hypothesis, if successful then transmission continues indication to described demultiplexing module, if failure then suppose that in described two fields another is correct and trial solution is multiplexing, if success then send and continue indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
Further, described fault-tolerant processing module comprises to be judged submodule and attempts submodule, as shown in Figure 4:
After described judgement submodule is used to receive described multiplexed frame head information, check that multiplex frame head length and multiplexed sub frame count the value of these two fields and whether mate (in other words not contradiction), if coupling then send and continue indication to described demultiplexing module; Otherwise transmission work is indicated to described trial submodule.
Described trial submodule is used for receiving that any of hypothesis multiplexed sub frame number and these two fields of multiplex frame head length is correct earlier in the work indication back of judging submodule, and extrapolates the value of the correct field of non-hypothesis, and trial solution is multiplexing then; If successful then transmission continues indication to described demultiplexing module, carry the value of above-mentioned two fields when attempting in the described continuation indication, otherwise suppose that in two fields another is correct, and extrapolate the value of the correct field of non-hypothesis, trial solution is multiplexing then, if successful then transmission continues indication to described demultiplexing module, the value of above-mentioned two fields when carrying trial in the described continuation indication, otherwise transmission is abandoned indication to described demultiplexing module.
Multiplexing being meant of described trial submodule trial solution: attempt submodule and navigate to multiplexed sub frame, attempt first multiplexed sub frame is carried out demultiplexing according to multiplex frame head length.When hypothesis multiplex frame head length is correct, navigate to multiplexed sub frame according to the correct multiplex frame head length of this hypothesis exactly; When hypothesis multiplexed sub frame number is correct, navigate to multiplexed sub frame according to the multiplex frame head length of extrapolating exactly.Described trial submodule trial solution is multiplexing successfully to be meant: the subframe head to first multiplexed sub frame behind the trial submodule demultiplexing carries out verification succeeds.
Described demultiplexing module is used for receiving the continuation indication back of judging submodule and continues demultiplexing by original multiplex frame head length of multiplexed frame head information and multiplexed sub frame number; After receiving the continuation indication of attempting submodule, continue demultiplexing according to multiplex frame head length of carrying in this indication and multiplexed sub frame number.
The judgement whether multiplexed sub frame number and multiplex frame head length mate is with described in the method.The value of calculating the field that non-hypothesis is correct also is to carry out according to the particular kind of relationship in the method.Describedly judge submodule checks it is whether the value of these two fields of digital examination meets the particular kind of relationship described in the method that multiplex frame head length and multiplexed sub frame count whether the value of these two fields mate: multiplex frame head length is that the total length of fixed-length field in the multiplexed frame head information adds the multiplexed sub frame number and the sum of products corresponding to the header information length of a multiplexed sub frame; Described trial submodule is further used for extrapolating by above-mentioned particular kind of relationship the value of the correct field of non-hypothesis.
Described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing also can be meant:
To count in these two fields any correct and trial solution is multiplexing for multiplex frame head length and multiplexed sub frame in the fault-tolerant processing module hypothesis multiplex frame head, if success then send and continue indication to described demultiplexing module; If failure then suppose that in described two fields another is correct and trial solution is multiplexing; If success then send to continue indication, if failure then send and abandon indication to described demultiplexing module to described demultiplexing module.
This fault-tolerant processing module is equivalent to the way of realization after preceding a kind of fault-tolerant processing module has been omitted the judgement submodule, the same with corresponding method, this fault-tolerant processing module is from the single demultiplexing, realize comparatively simple in logic, but as a whole,, adopt the efficient of a last fault-tolerant processing module higher so if the error code of most of frame head is not to occur in this two fields, as long as judge that two fields match just can continue demultiplexing, and need not carry out subsequent step.
Described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing can also to be meant: the value of fault-tolerant processing module hypothesis multiplex frame head length is correct, and trial solution is multiplexing; If success then send to continue indication, if failure then send and abandon indication to described demultiplexing module to described demultiplexing module.
The same with corresponding method, the ability of this fault-tolerant processing module save data a little less than, fault-tolerant ability is lower in other words.But from single demultiplexing angle, realize that logic is very simple, can simplified design, reduce cost, and have certain fault-tolerant ability.
Multiplexing being meant of described fault-tolerant processing module trial solution: described fault-tolerant processing module navigates to multiplexed sub frame according to described multiplex frame head length and attempts first multiplexed sub frame is carried out demultiplexing; Described fault-tolerant processing module trial solution is multiplexing successfully to be meant: the subframe head to first multiplexed sub frame behind the fault-tolerant processing module demultiplexing carries out verification succeeds.
Further be illustrated with an application example of the present invention below.
Should with exemplary application in the CMMB system, may further comprise the steps:
(1) multiplexed frame is carried out demultiplexing, if the multiplex frame head CRC check is failed then carried out step (2); Otherwise carry out step (5).
(2) check whether multiplexed sub frame number and multiplex frame head length mate.The length of multiplex frame head should be the summation of fixed-length field in the frame head, adds that the multiplexed sub frame number multiply by 3, is unit with the byte; If coupling--promptly meet above-mentioned relation then carry out step (5), otherwise carry out step (3).
(3) hypothesis multiplexed sub frame number is correct earlier, calculates multiplex frame head length, attempts first subframe is carried out demultiplexing, if the subframe head of first subframe is carried out the CRC check success, then above-mentioned hypothesis is set up, and carries out step (5).Otherwise carry out (4)
(4) suppose that multiplex frame head length is correct, the anti-multiplexed sub frame number of releasing.And the subframe head of first subframe carried out CRC check, if success then should hypothesis be set up, carry out step (5); Otherwise abandon the data of this second, receive next multiplexed frame and return (1).
(5) navigate to multiplexed sub frame and proceed demultiplexing.
Calculate theoretically, when 1 bit error code appears in the frame head the inside, the length of typical frame head has 152 bits approximately, and wherein " frame head length " and " number of sub-frames " two fields have 12 bits, in the time of outside error code occurs in 12 bits, promptly under the situation of (140/152)=92%, all may be tolerated.As can be seen, the present invention can improve the tolerance to error code.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (19)
1, improve fault-tolerant Deplexing method in a kind of mobile multimedia broadcast system, be applicable to the mobile multimedia broadcast system that carries out data multiplex according to China Mobile multimedia broadcasting CMMB standard, comprising:
When multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head to carry out trial solution multiplexing, if success then continue demultiplexing; Otherwise abandon this second data.
2, Deplexing method as claimed in claim 1 is characterized in that:
Described verification is a cyclic redundancy check (CRC).
3, Deplexing method as claimed in claim 1 is characterized in that, can also comprise:
If arbitrary multiplexed sub frame head verification failure supposes that then the value of header length field in the multiplexed sub frame head is correct, first section trial that navigates to behind the subframe head is carried out demultiplexing to it, if paragraph header is carried out verification succeeds, then continues demultiplexing; , verification abandons the data of this second if failing;
First section behind the described subframe head is any in data segment, audio section and the video-frequency band.
4, as each described Deplexing method in the claim 1 to 3, it is characterized in that, describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing to be meant:
Judge earlier whether multiplex frame head length and multiplexed sub frame are counted these two fields correct, if correctly then continue demultiplexing; If wherein any is correct and trial solution is multiplexing for incorrect then hypothesis, if success then continue demultiplexing; If failure then suppose that in described two fields another is correct and trial solution is multiplexing, if success then continue demultiplexing, if failure then abandon this second data.
5, Deplexing method as claimed in claim 4 is characterized in that, specifically comprises:
A, multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then carry out step B;
B, check that multiplex frame head length and multiplexed sub frame in the multiplex frame head counts the value of these two fields and whether mate, if do not match then carry out step C; Coupling then navigates to multiplexed sub frame by original multiplex frame head length and multiplexed sub frame number and proceeds next step demultiplexing;
C, suppose that any field in multiplexed sub frame number and the multiplex frame head length is correct, extrapolate the value of the correct field of non-hypothesis, trial solution is multiplexing then, if the subframe head of first multiplexed sub frame is carried out verification succeeds, the value of above-mentioned two fields continues demultiplexing during then by trial; Otherwise suppose that in two fields another is for correct, extrapolate the value of not supposing correct field, trial solution is multiplexing then, if the subframe head of first multiplexed sub frame is carried out verification succeeds, the value of above-mentioned two fields continues demultiplexing during then by trial, otherwise abandons the data of this second.
6, Deplexing method as claimed in claim 5 is characterized in that, among the step B, the length of described multiplex frame head and multiplexed sub frame are counted these two fields match and be meant that the value of these two fields meets following particular kind of relationship:
Multiplex frame head length is that the total length of fixed-length field in the multiplexed frame head information adds the multiplexed sub frame number and the sum of products corresponding to the header information length of a multiplexed sub frame;
Among the step C, extrapolate the value of the correct field of non-hypothesis by above-mentioned particular kind of relationship.
7, Deplexing method as claimed in claim 5 is characterized in that, among the step C, described trial solution is multiplexing to be meant:
Navigate to multiplexed sub frame according to multiplex frame head length, attempt first multiplexed sub frame is carried out demultiplexing; When hypothesis multiplex frame head length is correct, navigate to multiplexed sub frame according to the correct multiplex frame head length of this hypothesis; When hypothesis multiplexed sub frame number is correct, navigate to multiplexed sub frame according to the multiplex frame head length of extrapolating.
8, as each described Deplexing method in the claim 1 to 3, it is characterized in that, describedly count these two fields or one of them according to multiplex frame head length and multiplexed sub frame in the multiplex frame head and carry out that trial solution is multiplexing to be meant:
The value of supposing multiplex frame head length is correct, and trial solution is multiplexing; If the success would continue demultiplexing; If failure then abandon the data of this second.
9, Deplexing method as claimed in claim 8 is characterized in that, specifically comprises:
A, multiplexed frame is carried out demultiplexing, if the header check of multiplexed frame failure then carry out step b;
B, suppose that the value of multiplex frame head length field in the multiplex frame head is correct, trial solution is multiplexing then; If the subframe head to first multiplexed sub frame carries out verification succeeds, then continue demultiplexing; , verification abandons the data of this second if failing.
10, Deplexing method as claimed in claim 9 is characterized in that, among the step b, described trial solution is multiplexing to be meant:
Navigating to multiplexed sub frame according to described multiplex frame head length attempts first multiplexed sub frame is carried out demultiplexing.
11, improve fault-tolerant demodulation multiplexer in a kind of mobile multimedia broadcast system, be applicable to the mobile multimedia broadcast system that carries out data multiplex according to the CMMB standard, comprise the demultiplexing module that is used for received multiplexed frame is carried out successively demultiplexing; It is characterized in that, also comprise:
The fault-tolerant processing module;
Described demultiplexing module is used for also will comprising at least that the multiplexed frame head information of multiplex frame head length and/or multiplexed sub frame number sends to described fault-tolerant processing module when multiplexed frame head information checking is failed; Also be used to receive the continuation indication back continuation demultiplexing of fault-tolerant processing module; Also be used to receive the data of abandoning abandoning after indicating current this second of fault-tolerant processing module;
Described fault-tolerant processing module is used for after receiving described multiplexed frame head information counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame, and to carry out trial solution multiplexing, if success then send and continue indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
12, demodulation multiplexer as claimed in claim 11 is characterized in that:
Described demultiplexing module also is used for after abandoning the data of this second the data that next second received being carried out demultiplexing.
13, demodulation multiplexer as claimed in claim 11 is characterized in that:
Described demultiplexing module also is used for when arbitrary multiplexed sub frame head verification is failed, and the value that sends header length field in the multiplexed sub frame head is to described fault-tolerant processing module;
Described fault-tolerant processing module also is used for after receiving the value of described header length field, and first section trial that navigates to behind the subframe head is carried out demultiplexing to it, if paragraph header is carried out verification succeeds, sends and continues indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
It is in data segment, audio section and the video-frequency band any that described fault-tolerant processing module navigates to first section behind the subframe head.
As each described demodulation multiplexer of claim 11 to 13, it is characterized in that 14, described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing to be meant:
The fault-tolerant processing module judges earlier whether multiplex frame head length and multiplexed sub frame are counted these two fields correct, if correctly then send and continue to indicate to described demultiplexing module; If wherein any is correct and trial solution is multiplexing for incorrect then hypothesis, if successful then transmission continues indication to described demultiplexing module, if failure then suppose that in described two fields another is correct and trial solution is multiplexing, if success then send and continue indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
15, demodulation multiplexer as claimed in claim 14 is characterized in that, described fault-tolerant processing module further comprises:
Judge submodule and attempt submodule;
After described judgement submodule is used to receive described multiplexed frame head information, check that multiplex frame head length and multiplexed sub frame count the value of these two fields and whether mate, if coupling then send and continue indication to described demultiplexing module; Otherwise transmission work is indicated to described trial submodule;
Described trial submodule is used for receiving that any of hypothesis multiplexed sub frame number and these two fields of multiplex frame head length is correct earlier in the work indication back of judging submodule, and extrapolates the value of the correct field of non-hypothesis, and trial solution is multiplexing then; If successful then transmission continues indication to described demultiplexing module, carry the value of above-mentioned two fields when attempting in the described continuation indication, otherwise suppose that in two fields another is correct, and extrapolate the value of the correct field of non-hypothesis, trial solution is multiplexing then, if successful then transmission continues indication to described demultiplexing module, the value of above-mentioned two fields when carrying trial in the described continuation indication, otherwise transmission is abandoned indication to described demultiplexing module.
Described demultiplexing module is used for receiving the continuation indication back of judging submodule and continues demultiplexing by original multiplex frame head length of multiplexed frame head information and multiplexed sub frame number; After receiving the continuation indication of attempting submodule, continue demultiplexing according to multiplex frame head length of carrying in this indication and multiplexed sub frame number.
16, demodulation multiplexer as claimed in claim 15 is characterized in that, describedly judges submodule checks it is whether the value of these two fields of digital examination meets following particular kind of relationship that multiplex frame head length and multiplexed sub frame count whether the value of these two fields mate:
Multiplex frame head length is that the total length of fixed-length field in the multiplexed frame head information adds the multiplexed sub frame number and the sum of products corresponding to the header information length of a multiplexed sub frame;
Described trial submodule is further used for extrapolating by above-mentioned particular kind of relationship the value of the correct field of non-hypothesis.
17, demodulation multiplexer as claimed in claim 15 is characterized in that, multiplexing being meant of described trial submodule trial solution:
Attempt submodule and navigate to multiplexed sub frame, attempt first multiplexed sub frame is carried out demultiplexing according to multiplex frame head length; When hypothesis multiplex frame head length was correct, the multiplex frame head length correct according to this hypothesis navigated to multiplexed sub frame; When hypothesis multiplexed sub frame number is correct, navigate to multiplexed sub frame according to the multiplex frame head length of extrapolating;
Described trial submodule trial solution is multiplexing successfully to be meant: the subframe head to first multiplexed sub frame behind the trial submodule demultiplexing carries out verification succeeds.
As each described demodulation multiplexer of claim 11 to 13, it is characterized in that 18, described fault-tolerant processing module is used for counting these two fields or one of them according to multiplex frame head multiplex frame head length and multiplexed sub frame and carries out that trial solution is multiplexing to be meant:
The value of fault-tolerant processing module hypothesis multiplex frame head length is correct, and trial solution is multiplexing; If successful then transmission continues indication to described demultiplexing module; Abandon indication to described demultiplexing module otherwise send.
19, demodulation multiplexer as claimed in claim 18 is characterized in that, multiplexing being meant of described fault-tolerant processing module trial solution:
Described fault-tolerant processing module navigates to multiplexed sub frame according to described multiplex frame head length and attempts first multiplexed sub frame is carried out demultiplexing;
Described fault-tolerant processing module trial solution is multiplexing successfully to be meant: the subframe head to first multiplexed sub frame behind the fault-tolerant processing module demultiplexing carries out verification succeeds.
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| CNA2008100575821A CN101262326A (en) | 2008-02-03 | 2008-02-03 | De-multiplexing method and de-multiplexer for improving error tolerance in mobile multimedia broadcast system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101835051A (en) * | 2010-04-20 | 2010-09-15 | 杭州国芯科技股份有限公司 | Method for correcting mobile multimedia broadcasting multiplex frame head |
| CN101841370A (en) * | 2010-03-30 | 2010-09-22 | 深圳市云海通讯股份有限公司 | Method and device for identifying error code in digital optical fiber transmission and repeater |
| WO2011017821A1 (en) * | 2009-08-11 | 2011-02-17 | 上海贝尔股份有限公司 | Evolved multimedia broadcast multicast service system and method for performing statistical multiplexing for services with different quality of service class identifiers |
| CN102196273A (en) * | 2010-03-10 | 2011-09-21 | 中兴通讯股份有限公司 | Method and device for protecting mobile multimedia broadcasting interframe data |
| CN114844705A (en) * | 2022-05-06 | 2022-08-02 | 珠海格力电器股份有限公司 | Communication data processing method and system, communication equipment and electric equipment |
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- 2008-02-03 CN CNA2008100575821A patent/CN101262326A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011017821A1 (en) * | 2009-08-11 | 2011-02-17 | 上海贝尔股份有限公司 | Evolved multimedia broadcast multicast service system and method for performing statistical multiplexing for services with different quality of service class identifiers |
| US8773983B2 (en) | 2009-08-11 | 2014-07-08 | Alcatel Lucent | Evolved multimedia broadcast multicast service system and method for performing statistical multiplexing of services with different quality of service class identifiers |
| CN102196273A (en) * | 2010-03-10 | 2011-09-21 | 中兴通讯股份有限公司 | Method and device for protecting mobile multimedia broadcasting interframe data |
| CN102196273B (en) * | 2010-03-10 | 2013-08-07 | 中兴通讯股份有限公司 | Method and device for protecting mobile multimedia broadcasting interframe data |
| CN101841370A (en) * | 2010-03-30 | 2010-09-22 | 深圳市云海通讯股份有限公司 | Method and device for identifying error code in digital optical fiber transmission and repeater |
| CN101835051A (en) * | 2010-04-20 | 2010-09-15 | 杭州国芯科技股份有限公司 | Method for correcting mobile multimedia broadcasting multiplex frame head |
| CN101835051B (en) * | 2010-04-20 | 2012-02-01 | 杭州国芯科技股份有限公司 | Method for correcting mobile multimedia broadcasting multiplex frame head |
| CN114844705A (en) * | 2022-05-06 | 2022-08-02 | 珠海格力电器股份有限公司 | Communication data processing method and system, communication equipment and electric equipment |
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