CN102196273A - Method and device for protecting mobile multimedia broadcasting interframe data - Google Patents
Method and device for protecting mobile multimedia broadcasting interframe data Download PDFInfo
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- CN102196273A CN102196273A CN2010101213030A CN201010121303A CN102196273A CN 102196273 A CN102196273 A CN 102196273A CN 2010101213030 A CN2010101213030 A CN 2010101213030A CN 201010121303 A CN201010121303 A CN 201010121303A CN 102196273 A CN102196273 A CN 102196273A
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Abstract
The invention discloses a method for protecting mobile multimedia broadcasting interframe data, comprising the following steps of: arranging a buffer region at a transmission end of a mobile multimedia broadcasting system; and for a service need to carry out multiplexing subframe interframe data protection, protecting data packed in each multiplexing subframe by utilizing an FEC (Forward Error Correction) coding algorithm before a plurality of multiplexing subframes carrying the data of the service are transmitted outwards, and then retransmitting the multiplexing subframes outwards. The invention also discloses a device for protecting mobile multimedia broadcasting interframe data. Through the method and device disclosed by the invention, a receiving end can recover data of original multiplexing subframes of the protected service by utilizing an FEC decoding algorithm, thus a problem that the data of the multiplexing subframes can not be recovered because of higher multiplexing interframe error rate caused by long interference, which is generally generated in the mobile multimedia broadcasting, can be solved, and the transmission efficiency and the fault tolerance of the mobile multimedia broadcasting system are improved.
Description
Technical field
The present invention relates to China mobile multi-media broadcasting technology, relate in particular to a kind of guard method and device of Mobile Multimedia Broadcasting interframe data.
Background technology
Along with development of Communication Technique, the application of China mobile multi-media broadcasting technology is more and more wider.Regulation in China Mobile multimedia broadcasting (CMMB, China Mobile Multimedia Broadcasting) standard " Mobile Multimedia Broadcasting part 2: multiplexing " adopts stream medium datas such as multiplexed sub frame encapsulate video, audio frequency, transmits.
Mobile multimedia broadcast system is in carrying out the wireless data transmission process, and interference of noise will cause the distortion and the distortion of signal.Therefore, adopt chnnel coding to improve systematic function in physical layer in the CMMB standard.But, because each audio frequency and video business is encapsulated in the multiplexed sub frame of different multiplexed frames, and, multiplexed frame in the CMMB standard is that the branch time slot transmits, concretely, the professional shared time slot duration of each audio frequency and video, about 100ms, the same time slot in each second transmitted identical audio frequency and video business usually.Therefore, under the certain condition of interference strength, if to normal signal interference for a long time, then the error rate in certain multiplexed frame of receiving of receiving terminal is often than higher.If after the error rate in the multiplexed frame had exceeded the error correcting capability scope of system, receiving terminal just can not utilize the data of each multiplexed sub frame that carries certain audio, video data to recover the data of this audio frequency and video business.So, the efficiency of transmission and the fault-tolerance of mobile multimedia broadcast system have been influenced.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of guard method and device of Mobile Multimedia Broadcasting interframe data, to solve the defective that can't recover wrong frame data when error code is higher in multiplexed frame.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of guard method of Mobile Multimedia Broadcasting interframe data, comprising:
Transmitting terminal at mobile multimedia broadcast system is provided with a buffering area;
Do the business of multiplexed sub frame interframe data protection for needs; before a plurality of multiplexed sub frames that carry these professional data outwards send; The data forward error correction coding (FEC) algorithm that is encapsulated in each multiplexed sub frame is protected, outwards sent multiplexed sub frame afterwards again.
In the such scheme, the described The data FEC algorithm that will be encapsulated in each multiplexed sub frame is protected, and is specially:
The multiplexed sub frame that carries the business that needs protection to be transmitted is put into buffering area, after the multiplexed sub frame number in the buffering area reaches m, the data that m multiplexed sub frame carried are as one group, be divided into k source block, adopt predefined FEC algorithm afterwards, from k source block n-k the redundancy encoding data block of encoding out, and obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block with CRC (CRC) algorithm;
N-k redundancy encoding data block distributed to m multiplexed sub frame, and redundancy encoding data block and the supplementary that will distribute to each multiplexed sub frame afterwards are encapsulated in the corresponding multiplexed sub frame, and each multiplexed sub frame is re-constructed.
In the such scheme, described method further comprises: determine to handle last multiplexed sub frame of the data of carrying described business, finish current handling process.
In the such scheme, described redundancy encoding data block and the supplementary that will distribute to each multiplexed sub frame is encapsulated in the corresponding multiplexed sub frame, and each multiplexed sub frame is re-constructed, and is specially:
Described redundancy encoding data block and supplementary are encapsulated in the data segment of multiplexed sub frame;
The preceding existing data of structure still all are placed on original position in the multiplexed sub frame after rebuilding.
In the such scheme, described multiplexed sub frame be carried same mobile multi-media broadcasting service, have a multiplexed sub frame of precedence relationship in time.
In the such scheme, described supplementary comprises: the crc value relevant with source block, crc value, block size and the sequence number of being correlated with the redundancy encoding data block.
In the such scheme, described supplementary further comprises: the positional information of source block; And/or, the FEC coding parameter.
The present invention also provides a kind of protective device of Mobile Multimedia Broadcasting interframe data, comprising: buffering area, algoritic module and sending module; Wherein
Buffering area is used to deposit a plurality of multiplexed sub frames of the data of carrying the business that needs protection, and deposits the data after algoritic module adopts the protection of FEC algorithm, and after the data of depositing after algoritic module adopts the protection of FEC algorithm, triggers sending module;
Algoritic module is used for the data that leave in the described a plurality of multiplexed sub frames in the buffering area are carried out the FEC algorithm, and the data after will protecting after the FEC algorithm is finished are encapsulated in corresponding each multiplexed sub frame in the buffering area more again;
Sending module after being used for data after algoritic module will be protected and being encapsulated in corresponding each multiplexed sub frame in the buffering area more again, sends each multiplexed sub frame.
In the such scheme, described algoritic module, specifically be used for: the data that leave in the described a plurality of multiplexed sub frames in the buffering area are carried out the FEC algorithm, obtain source block and redundancy encoding data block, again the source block and the redundancy encoding data block that adopt the FEC algorithm to obtain are carried out the CRC algorithm, obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block, and, be encapsulated in corresponding each multiplexed sub frame in the buffering area the redundant data piece and the supplementary that obtain behind FEC algorithm and the CRC algorithm.
In the such scheme, described device also comprises:
Judge module is used for determining to handle last multiplexed sub frame of the data of carrying described business, the end process flow process after sending module sends the multiplexed sub frame of encapsulation again.
The guard method of Mobile Multimedia Broadcasting interframe data provided by the invention and device, transmitting terminal at mobile multimedia broadcast system is provided with a buffering area, do the business of multiplexed sub frame interframe data protection for needs, before a plurality of multiplexed sub frames that carry these professional data outwards send, the The data FEC algorithm and the CRC algorithm that are encapsulated in each multiplexed sub frame are protected, and then outwards sent; When the multiplexed sub frame data that receive when receiving terminal make a mistake or multiplexed sub frame when losing, as long as the correct coding data block number in the same group of received multiplexed sub frame is not less than k, receiving terminal just can utilize the decoding FEC algorithm to recover the data of the original multiplexed sub frame of this group, so, can solve that Mobile Multimedia Broadcasting occurs in propagating usually because long the interference causes the error rate in the multiplexed frame higher and can't recover the problem of multiplexed sub frame data, and then promote the efficiency of transmission and the fault-tolerance of mobile multimedia broadcast system.
Description of drawings
Fig. 1 realizes the guard method schematic flow sheet of Mobile Multimedia Broadcasting interframe data for the present invention;
Fig. 2 is the implementation method schematic flow sheet of the embodiment of the invention;
Fig. 3 is the schematic diagram of forward error correction deletion cataloged procedure in the embodiment of the invention;
Fig. 4 for the encapsulation of the embodiment of the invention after re-constructing the internal structure schematic diagram of multiplexed sub frame of redundancy encoding data block and supplementary;
Fig. 5 is the protective device structural representation of Mobile Multimedia Broadcasting interframe data of the present invention.
Embodiment
Basic thought of the present invention is: the transmitting terminal at mobile multimedia broadcast system is provided with a buffering area; Do the business that the multiplexed sub frame interframe data is protected for needs, before a plurality of multiplexed sub frames that carry these professional data outwards send, the The data FEC algorithm that is encapsulated in each multiplexed sub frame is protected, outwards send multiplexed sub frame afterwards again.The multiplexing intraframe data that receives when receiving terminal makes a mistake or when going out active, can utilize the protection information of multiplexed sub frame interframe, recovers by error code or this professional initial data of having lost.
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The guard method flow chart that the present invention realizes the Mobile Multimedia Broadcasting interframe data may further comprise the steps as shown in Figure 1:
Step 101: the transmitting terminal in Mobile Multimedia Broadcasting is provided with a buffering area;
Here, the size of described buffering area can be deposited m multiplexed sub frame; Described m value can limit, protect complexity of intensity and FEC algorithm etc. to be provided with according to time delay.
Step 102: the multiplexed sub frame that carries the business that needs protection that will be to be transmitted is put into buffering area, after the multiplexed sub frame number in the buffering area reaches m, and execution in step 103;
In this step, the described business that needs protection can be configured by the keeper, and for example: the keeper thinks the business that important business is defined as needing protection with some;
Described multiplexed sub frame be carried same mobile multi-media broadcasting service, have a multiplexed sub frame of precedence relationship in time; After multiplexed sub frame was put into buffering area, according to the sequencing of time, transmitting terminal can give each multiplexed sub frame configuration a corresponding sequence number; Sequence number is an integer, since 0, is up to X, and X is typically chosen in the integral multiple-1 of m.
Step 103: the data that m multiplexed sub frame carried are as one group, be divided into k source block, adopt predefined FEC algorithm afterwards, from k source block n-k the redundancy encoding data block of encoding out, and obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block with CRC (CRC) algorithm;
Here, the described n value number that is coded data block; K, n are integer, and its value depends on the Data Protection rank to the business of being protected, and protection level is high more, (n-k)/and the value of n is also just big more, k＜n;
Preferred closing is: the entrained data of each multiplexed sub frame are divided into a source block, and a is an integer, satisfy: a * m=k;
When adopting the FEC algorithm, source block and redundancy encoding data block all need be got unified block size L, the value of L is relevant with the coding parameter of FEC algorithm; A source block is according to the isometric division of L size in the multiplexed sub frame, in partition process, if remaining size of data during less than L, then with remaining data as a source block, this source block afterbody filled participate in computing after snapping to the L size, realize that with filling zero afterbody aligns usually;
Each source block can all have a relative crc value, and each redundancy encoding data block can all have a relative crc value; In actual applications, simplify in order to make processing procedure, can also be that all source block that are encapsulated in the multiplexed sub frame have a relative crc value, all redundancy encoding data blocks that are encapsulated in the multiplexed sub frame have a relative crc value.
Step 104: give m multiplexed sub frame with n-k redundancy encoding data block mean allocation, redundancy encoding data block and the supplementary that to distribute to each multiplexed sub frame afterwards are encapsulated in the corresponding multiplexed sub frame, each multiplexed sub frame is re-constructed, and execution in step 105 afterwards;
Here, describedly give m multiplexed sub frame with n-k redundancy encoding data block mean allocation, be specifically as follows: b * m=k-n, b are called the number of distributing to each multiplexed sub frame redundancy encoding data block, and b is an integer;
Described redundancy encoding data block and the supplementary that will distribute to each multiplexed sub frame is encapsulated in the corresponding multiplexed sub frame, and each multiplexed sub frame is re-constructed, and is specially:
Described redundancy encoding data block and supplementary are encapsulated in the data segment of multiplexed sub frame, are redundancy encoding data block or supplementary by the packaged data of attribute field indication, such as: adopt the data cell type in the data segment to indicate;
The preceding existing data of structure still all are placed on original position in the multiplexed sub frame after rebuilding, concretely, it is in the frequency range that the data of video-frequency band still are placed on, the data of audio section still are placed in the audio section, data in the data segment still are placed in the data segment, and relevant field, for example: data segment, length, the data segment of multiplexed sub frame head are first-class, then can change according to re-constructing the actual change that causes;
Described supplementary comprises: the crc value relevant with source block, crc value, L value and the sequence number of being correlated with the redundancy encoding data block;
The described crc value relevant with source block specifically is used for: receiving terminal is calculated the crc value relevant with each source block that receives to the source block in the multiplexed sub frame that receives with the CRC algorithm; The crc value relevant with each source block that receiving terminal will calculate compared with the crc value relevant with each source block that receives, and judges whether each source block in the received multiplexed sub frame is wrong;
The described crc value relevant with the redundancy encoding data block specifically is used for: receiving terminal is calculated the crc value relevant with each redundancy encoding data block that receives to the redundancy encoding data block in the multiplexed sub frame that receives with the CRC algorithm; The crc value relevant with each redundancy encoding data block that receiving terminal will calculate compared with the crc value relevant with each redundancy encoding data block that receives, and judges whether each the redundancy encoding data block in the received multiplexed sub frame is wrong;
Receiving terminal can be known the size of each coded data block in the group by described L value, thereby can calculate crc value relevant with source block and the relevant crc value of redundancy encoding data block according to the L value;
Receiving terminal can know the multiplexed sub frame that receives is to belong to which group by described sequence number, particularly, can know the packet number of the multiplexed sub frame of reception after the ratio of receiving terminal by c and m rounds, c is the sequence number of multiplexed sub frame, and span is 0 to X, be that sub-frame number of every processing increases by 1, arriving unrolls behind the X to 0 restarts counting, if the sequence number of multiplexed sub frame is c, institute divides into groups at the subframe place of handling and can roughly calculate like this, packet number Y=[c/m], [] expression rounds; Receiving terminal can also know whether by described sequence number losing of multiplexed sub frame taken place;
Transmitting terminal and receiving terminal can have and the corresponding decoding FEC algorithm of transmitting terminal by alternate manner agreement receiving terminal in advance;
Described supplementary may further include the positional information of source block, and receiving terminal can be known the positional information at each source block place in view of the above; And/or m, k, n, a and b, receiving terminal can carry out and the corresponding decoding FEC algorithm of transmitting terminal in view of the above; Described m, k, n, a and b are called the FEC coding parameter.
Step 105: this m multiplexed sub frame that has carried out data protection exported from buffering area, carried out transmit operation, execution in step 106 afterwards;
Step 106: judge whether to handle last multiplexed sub frame that carries these professional data, if, then finish current handling process, otherwise, execution in step 102.
The guard method of Mobile Multimedia Broadcasting interframe data provided by the invention; when the multiplexed sub frame data that receive when receiving terminal make a mistake or multiplexed sub frame when losing; can utilize interframe protection information, adopt the initial data of that decoding FEC just can recover by error code or the business of protecting of having lost.For a group coding data block, the decoding FEC algorithm can recover k source block from any k correct coded data block.
Concretely, when each source block all has a relative crc value, when each redundancy encoding data block all has a relative crc value, whether can detect source data corresponding in the multiplexed sub frame by each crc value relevant with source block in the supplementary makes a mistake, if when having the interior source block of which multiplexed sub frame to make a mistake, receiving terminal is labeled as deletion with this source block; Whether can detect multiplexed sub frame according to sequence number and lose, if when having which multiplexed sub frame to lose, receiving terminal is labeled as deletion with all source block in this multiplexed sub frame and all redundancy encoding data blocks; Same, can detect according to each crc value relevant whether the corresponding redundant coded data block makes a mistake in the multiplexed sub frame with the redundancy encoding data block, if when having which redundancy encoding data block to make a mistake, receiving terminal is labeled as deletion with this redundancy encoding data block;
All source block in being encapsulated into a multiplexed sub frame have a relative crc value, when being encapsulated into all redundancy encoding data blocks in the multiplexed sub frame and having a relative crc value, whether can detect source data corresponding in the multiplexed sub frame by the crc value relevant with all source block in the supplementary makes a mistake, if when having the interior source block of which multiplexed sub frame to make a mistake, receiving terminal is labeled as deletion with all source block in this multiplexed sub frame; Whether can detect multiplexed sub frame according to sequence number and lose, if when having which multiplexed sub frame to lose, receiving terminal is labeled as deletion with all source block in this multiplexed sub frame and all redundancy encoding data blocks; Can detect according to the crc value relevant whether the corresponding redundant coded data block makes a mistake in the multiplexed sub frame with all redundancy encoding data blocks, if when having the interior redundancy encoding data block of which multiplexed sub frame to make a mistake, receiving terminal is labeled as deletion with all the redundancy encoding data blocks in this multiplexed sub frame;
As long as the correct coding data block number in the same group of received multiplexed sub frame is not less than k, receiving terminal just can utilize the decoding FEC algorithm to recover the data of the original multiplexed sub frame of this group, so, can solve that Mobile Multimedia Broadcasting occurs in propagating usually because long the interference causes the error rate in the multiplexed frame higher and can't recover the problem of multiplexed sub frame data, and then promote the efficiency of transmission and the fault-tolerance of mobile multimedia broadcast system.
Select certain professional video-frequency band data in the multiplexed sub frame below for use, implement the data that interframe data is protected as needs, this part data is carried out the FEC algorithm, the specific implementation process may further comprise the steps as shown in Figure 2:
Step 201: the transmitting terminal in Mobile Multimedia Broadcasting is provided with a buffering area, and this buffering area can 3 multiplexed sub frames of buffer memory.
Step 202: this business video-frequency band data multiplexing subframe of carrying that will be to be transmitted is put into buffering area, after the multiplexed sub frame number in the buffering area reaches 3, and execution in step 203.
Step 203: the data that 3 multiplexed sub frames are carried are as one group, be divided into 6 source block, adopt predefined FEC algorithm afterwards, from 6 source block, 3 the redundancy encoding data blocks of encoding out, and obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block with the CRC algorithm;
Here, the FEC algorithm is a forward error correction deletion encryption algorithm.Concretely, Fig. 3 is the schematic diagram of forward error correction deletion encryption algorithm process in the embodiment of the invention, as shown in Figure 3, at first determine the coded data block size according to video-frequency band size maximum in 3 multiplexed sub frames, the value after half of maximum video-frequency band size rounded up is as the coded data block size; The video-frequency band data of other multiplexed sub frame, size according to coded data block is divided into 2 pieces, the remaining data of not enough block size becomes a coded data block by actual size, but when carrying out forward error correction deletion encryption algorithm, the coded data block of not enough block size participates in forward error correction deletion encryption algorithm after will filling alignment with 0 again, and Fig. 3 bend ST Stuffing Table registration is according to filling alignment; Afterwards, 6 coded data blocks are implemented forward error correction deletion encryption algorithm, generate 3 redundancy encoding data blocks, and obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block with the CRC algorithm;
Be encapsulated in two source block in the multiplexed sub frame and have a relative crc value is arranged, each redundancy encoding data block all has a relative crc value.
Step 204: give 3 multiplexed sub frames with 3 redundancy encoding data block mean allocation, redundancy encoding data block and the supplementary that to distribute to each multiplexed sub frame afterwards are encapsulated in the corresponding multiplexed sub frame, each multiplexed sub frame is re-constructed, and execution in step 105 afterwards;
Fig. 4 for the encapsulation of embodiment after re-constructing the internal structure of multiplexed sub frame of redundancy encoding data block and supplementary, as can be seen from the figure, the data of this business video-frequency band still are placed in the video-frequency band, supplementary and redundancy encoding data block all are encapsulated in the interior data cell of data segment, when encapsulation, the data cell type in the data segment can indicate whether packaged data are redundancy encoding data block or supplementary;
Described supplementary comprises: the crc value relevant with source block, crc value, L value and sequence number that the redundancy encoding data block is relevant;
Wherein, the crc value relevant with source block specifically is used for: receiving terminal to the source block in the multiplexed sub frame that receives with the CRC algorithm calculate receive with each multiplexed sub frame in the relevant crc value of all source block; The crc value that the crc value that all source block with in each multiplexed sub frame that receiving terminal will calculate are relevant is relevant with all source block with in the multiplexed sub frame that receive is compared, and judges whether the source block in the received multiplexed sub frame is wrong;
The crc value relevant with the redundancy encoding data block specifically is used for: receiving terminal is calculated the crc value relevant with each redundancy encoding data block that receives to the redundancy encoding data block in the multiplexed sub frame that receives with the CRC algorithm; The crc value relevant with each redundancy encoding data block that receiving terminal will calculate compared with the crc value relevant with each redundancy encoding data block that receives, and judges whether each the redundancy encoding data block in the received multiplexed sub frame is wrong;
Receiving terminal can be known the size of each coded data block in the group by the L value, thereby can calculate crc value relevant with source block and the relevant crc value of redundancy encoding data block according to the L value;
Receiving terminal can know the multiplexed sub frame that receives is to belong to which group by sequence number, and can know whether by sequence number losing of multiplexed sub frame taken place;
Transmitting terminal and receiving terminal can have and the corresponding forward error correction deletion of transmitting terminal decoding algorithm by alternate manner agreement receiving terminal in advance; The relevant parameter of forward error correction deletion encryption algorithm, transmitting terminal and receiving terminal also can be arranged by other modes in advance, are not included in the supplementary;
The positional information of source block can derive out by the positional information and the L value of video-frequency band, therefore also can be not included in the supplementary; The positional information of video-frequency band can obtain from the subframe head;
Step 205: these 3 multiplexed sub frames that carry out data protection are exported from buffering area, carried out transmit operation, execution in step 206 afterwards;
Step 206: judge whether to handle last multiplexed sub frame that carries this business video data, if, then finish current handling process, otherwise, execution in step 202.
The scheme that present embodiment provides; the video-frequency band data make a mistake or when losing in multiplexed sub frame; receiving terminal can recover 6 original source block numbers from any 6 correct coded data blocks of same group; that is to say; can recover the video-frequency band data of all 3 multiplexed sub frames, thereby reach the purpose of data protection.
Multiplexed sub frame interframe in the above scheme refers to the interframe of the multiplexed sub frame in the different multiplexed frames.
Based on said method, the present invention also provides a kind of protective device of multimedia broadcasting interframe data, as shown in Figure 5, comprising: buffering area 51, algoritic module 52 and sending module 53; Wherein,
Sending module 53, be used in corresponding each multiplexed sub frame that data after algoritic module 52 will be protected are encapsulated into 51 li of buffering areas more again after, send each multiplexed sub frame.
Wherein, described algoritic module 52 specifically is used for:
The data that leave in a plurality of multiplexed sub frames in the buffering area 51 are carried out the FEC algorithm, obtain source block and redundancy encoding data block, again the source block and the redundancy encoding data block that adopt the FEC algorithm to obtain are carried out the CRC algorithm, obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block, and, be encapsulated in corresponding each multiplexed sub frame of 51 li of buffering areas the redundant data piece and the supplementary that obtain behind FEC algorithm and the CRC algorithm.
Described device can also comprise:
Judge module is used for determining to handle last multiplexed sub frame that carries professional data, the end process flow process after sending module 53 sends the multiplexed sub frame of encapsulation again.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the guard method of a Mobile Multimedia Broadcasting interframe data is characterized in that, this method comprises:
Transmitting terminal at mobile multimedia broadcast system is provided with a buffering area;
Do the business of multiplexed sub frame interframe data protection for needs; before a plurality of multiplexed sub frames that carry these professional data outwards send; The data forward error correction coding (FEC) algorithm that is encapsulated in each multiplexed sub frame is protected, outwards sent multiplexed sub frame afterwards again.
2. method according to claim 1 is characterized in that, the described The data FEC algorithm that will be encapsulated in each multiplexed sub frame is protected, and is specially:
The multiplexed sub frame that carries the business that needs protection to be transmitted is put into buffering area, after the multiplexed sub frame number in the buffering area reaches m, the data that m multiplexed sub frame carried are as one group, be divided into k source block, adopt predefined FEC algorithm afterwards, from k source block n-k the redundancy encoding data block of encoding out, and obtain crc value relevant and the crc value relevant with the redundancy encoding data block with source block with CRC (CRC) algorithm;
N-k redundancy encoding data block distributed to m multiplexed sub frame, and redundancy encoding data block and the supplementary that will distribute to each multiplexed sub frame afterwards are encapsulated in the corresponding multiplexed sub frame, and each multiplexed sub frame is re-constructed.
3. method according to claim 2 is characterized in that, described method further comprises: determine to handle last multiplexed sub frame of the data of carrying described business, finish current handling process.
4. method according to claim 2 is characterized in that, described redundancy encoding data block and the supplementary that will distribute to each multiplexed sub frame is encapsulated in the corresponding multiplexed sub frame, and each multiplexed sub frame is re-constructed, and is specially:
Described redundancy encoding data block and supplementary are encapsulated in the data segment of multiplexed sub frame;
The preceding existing data of structure still all are placed on original position in the multiplexed sub frame after rebuilding.
5. according to the arbitrary described method of claim 1 to 4, it is characterized in that, described multiplexed sub frame be carried same mobile multi-media broadcasting service, have a multiplexed sub frame of precedence relationship in time.
6. according to the arbitrary described method of claim 2 to 4, it is characterized in that described supplementary comprises: the crc value relevant, crc value, block size and the sequence number of being correlated with the redundancy encoding data block with source block.
7. method according to claim 6 is characterized in that, described supplementary further comprises: the positional information of source block; And/or, the FEC coding parameter.
8. the protective device of a Mobile Multimedia Broadcasting interframe data is characterized in that, this device comprises: buffering area, algoritic module and sending module; Wherein
Buffering area is used to deposit a plurality of multiplexed sub frames of the data of carrying the business that needs protection, and deposits the data after algoritic module adopts the protection of FEC algorithm, and after the data of depositing after algoritic module adopts the protection of FEC algorithm, triggers sending module;
Algoritic module is used for the data that leave in the described a plurality of multiplexed sub frames in the buffering area are carried out the FEC algorithm, and the data after will protecting after the FEC algorithm is finished are encapsulated in corresponding each multiplexed sub frame in the buffering area more again;
Sending module after being used for data after algoritic module will be protected and being encapsulated in corresponding each multiplexed sub frame in the buffering area more again, sends each multiplexed sub frame.
9. device according to claim 8, it is characterized in that, described algoritic module, specifically be used for: the data that leave in the described a plurality of multiplexed sub frames in the buffering area are carried out the FEC algorithm, obtain source block and redundancy encoding data block, again the source block and the redundancy encoding data block that adopt the FEC algorithm to obtain are carried out the CRC algorithm, obtain the crc value relevant with source block, and the crc value relevant with the redundancy encoding data block, and with the redundant data piece that obtains behind FEC algorithm and the CRC algorithm, and supplementary, be encapsulated in corresponding each multiplexed sub frame in the buffering area.
10. according to Claim 8 or 9 described devices, it is characterized in that described device also comprises:
Judge module is used for determining to handle last multiplexed sub frame of the data of carrying described business, the end process flow process after sending module sends the multiplexed sub frame of encapsulation again.
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| US20090013356A1 (en) * | 2007-07-05 | 2009-01-08 | Doerr Michael B | Mobile television broadcast system |
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| CN101272221A (en) * | 2008-05-04 | 2008-09-24 | 中兴通讯股份有限公司 | Transmission, receiving method and device of file data |
| CN101325720A (en) * | 2008-07-24 | 2008-12-17 | 中兴通讯股份有限公司 | Data fault-tolerant terminal and method |
| CN101656682A (en) * | 2009-06-12 | 2010-02-24 | 中兴通讯股份有限公司 | Method and system for processing mobile multimedia data broadcasting services |
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