CN101998278A - Method of terminal receiving strategy based on CMMB (China Mobile Multimedia Broadcasting) data broadcasting channel - Google Patents
Method of terminal receiving strategy based on CMMB (China Mobile Multimedia Broadcasting) data broadcasting channel Download PDFInfo
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- CN101998278A CN101998278A CN2009101692884A CN200910169288A CN101998278A CN 101998278 A CN101998278 A CN 101998278A CN 2009101692884 A CN2009101692884 A CN 2009101692884A CN 200910169288 A CN200910169288 A CN 200910169288A CN 101998278 A CN101998278 A CN 101998278A
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Abstract
The invention discloses a method of terminal receiving by a CMMB (China Mobile Multimedia Broadcasting) data broadcasting file mode. The method comprises the following step of: capturing a received XPE/XPE-FEC data package into a file patch/FAT (File Allocation Table) patch. The method can identify whether the file patch is damaged, lost or inter-cut so as to reduce unnecessary fault tolerance, guarantee the timeliness of receiving priority of business files, buffer a complete data block in time, and reduce memory consumption and the occupation of CPU. The method enhances the terminal receiving efficiency of data broadcasting easily and effectively.
Description
Technical field
The present invention relates to the implementation method of a kind of data file transmission in the mobile broadcast communications field, relate in particular to a kind of data broadcasting channel and realize the method and system that the data message terminal receives based on CMMB (China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting).
Background technology
Data broadcasting is a kind of broadcast channel that utilizes, with point-to-area broadcast mode, a kind of technical approach of multimedia messages such as transmission text, image, audio frequency, video or other formatted data can send data message to user by it, satisfies user's various information demand.The data broadcasting of CMMB can provide several data business such as financial information, communication navigation, e-magazine, video download, homepage broadcasting, serves the general public.
Defined the transfer of data and the method for packing of data broadcast service in the mobile multimedia broadcast system among the radio, film and television industry standard C MMB data broadcasting standard GY/T220.5.The data broadcasting protocol hierarchy comprises data service, file mode/stream mode, extensible protocol encapsulation (XPE/XPE-FEC), multiplexing, broadcast channel.The wherein multiplexing GY/T 220.2 that follows, broadcast channel is followed GY/T220.1.
File mode wherein, CMMB data broadcast standard have realized traditional data file section is the file sheet, have adopted the XPE/XPE-FEC encapsulation to be broadcast in the CMMB channel by multiplexer and goes.But when present CMMB standard is used file mode broadcasting,, will obviously reduce the characteristics of broadcasting efficiency, be difficult to the realization data downstream that the satisfying magnanimity data are used limited CMMB channel resource smoothness along with the increase of data file size.If will improve the data broadcasting overall performance, we need some to relate to method and strategy that the reception of front end information source, section algorithm, transmission and terminal receive, to solve the transmission problem of data file in CMMB data broadcasting channel.
Summary of the invention
The invention provides a kind of method that realizes the reception of data file mode terminal based on CMMB data broadcasting channel, terminal receives the data casting file data by this method, realize that packet intercuts the differentiation of information and packet loss data, reduce unnecessary tolerant fail algorithm, it is ageing to guarantee again simultaneously that service scripts priority receives, in time the buffer memory full block of data is avoided memory consumption.Effectively raise the terminal receiving efficiency of data broadcasting.
For achieving the above object, the present invention is by the following technical solutions:
A kind ofly realize that based on CMMB data broadcasting channel data file realizes reducing the method that terminal fault-tolerant and redundant operation receives under the situation that guarantees priority, comprise the steps: preferentially to detect the FAT file data and receive; Receive the process of service scripts sheet data; The process of file is intercutted in identification; The differentiation of file sheet integrality; The differentiation of blocks of files integrality, the piecemeal storing process, thus alleviate computing and the memory consumption burden that terminal receives.
Press such scheme, the data broadcasting terminal receives strategy and comprises: formation, FAT sheet intercut, blocks of files is intercutted, file sheet mistake is reduced, the file sheet is lost reduction.
Press such scheme, this method is implemented in the existing acquiescence method of reseptance, and according to the needs and the characteristic of business, invalid fault-tolerant computing is avoided in terminal very first time identification and judge service data loss, mistake, still intercut data.
Press such scheme, terminal can be that unit stores in the middle of the memory by blocks of files, under situation about guaranteeing data integrity, has saved memory consumption.
Press such scheme, front end is the broadcast data business under ad hoc rules, and terminal can receive strategy according to this ad hoc rules recognition data, reduces the make-up time.
Be used to adopt such scheme, the present invention compared with prior art has the following advantages:
The present invention is by receiving the definition of strategy to the data broadcast terminal, can make decision data file sheet accepting state in the terminal shortest time, optimize internal memory and CPU computing, storage in time avoids reasonably causing because of intercutting that the fault-tolerant and file sheet of unnecessary file sheet reduces computing.Make terminal when receiving data broadcasting, broadcast the complete reception of finishing data service in the cycle at steamboat, thereby improve the terminal inbound pacing.The present invention has improved data file greatly in CMMB data broadcasting channel transmitting efficiency, thereby has improved user's experience.
Description of drawings
Fig. 1 data casting file mode terminal receiving course
Specific implementation method
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
Before describing the present invention in detail, below now China Mobile multimedia broadcasting (China Mobile MultimediaBroadcasting is called for short CMMB) and China Mobile multimedia broadcasting data broadcasting are introduced, so that better understand the present invention.
The CMMB system utilizes high-power S-band satellite-signal to cover the whole country, utilize ground supplement translator with covering the satellite-signal blind area with content repeater satellite signal, benefit point simultaneously frequently, utilize mobile radio networks to make up return path, form the mobile media broadcasting network that One-to-All Broadcast and two-way interactive combine.
It is different with common family expenses large screen television with the transmission environment demand to be used for the required data quantity transmitted of mobile multimedia broadcast system, and therefore according to the characteristics of China's Mobile Multimedia Broadcasting, the CMMB system has adopted the multiplex technique of independent research.Multiplexed frame is made up of multiplex frame head, multiplexing payload and filling, and its effect and purpose are exactly encapsulation and the arrangement in order to finish audio frequency, video, data and control information, it can be fitted on the mobile multimedia broadcasting channel transmit.Each multiplexed frame is by the MF_ID unique identification, and the MF_ID span is 0～39, and wherein the multiplexed frame of MF_ID==0 is used for bear control information, and other multiplexed frame is used for bearer service, comprises data service.
In GY/T 220.5-2008, defined the data broadcasting basic format and cut apart section, transmission and method of reseptance for the realization of data broadcasting at mobile multimedia broadcast system.The present invention is exactly on this basis, further the data broadcast terminal being received formation and priority defines and differentiates, make terminal differentiate the data slice mistake, lose, still normally intercut by this method, avoid unnecessary fault-tolerant computing, simultaneously integrity data in time is saved in storage medium from buffer memory, thereby realize mobile multimedia data broadcast different priorities and traffic performance high efficiency transmission and reception in the CMMB system, reduce terminal CPU processing requirements and memory consumption.
The invention provides a kind of method that receives strategy based on the terminal of CMMB data broadcasting passage.This method realizes the very big raising of terminal to data broadcasting service receiving ability by the formation of data broadcast data being differentiated realization and data distributed store process.The present invention mainly comprises the content of the following aspects:
Terminal is screened data file sheet rule, and data broadcasting is defaulted as continuous file sheet, if next file sheet terminal, then judgement and processing rule are as follows, see Fig. 1:
This method is differentiated and the prerequisite of reduction is
Front end: XPE encapsulation loads the CRC32 indication, and carried out the XPE-FEC encapsulation, front end sends rule, and order sends, the XPE-FEC data of corresponding sequence number are closelyed follow after the XPE encapsulation, example: XPE0, XPE-FEC0, XPE1, XPE-FEC1, XPE2, XPE-FEC2......
Terminal is judged when receiving the XPEn packet when receiving file sheet XPE encapsulation;
Carry out CRC check;
A) if data integrity is then ignored reception XPE-FECn, the data intercept sheet.
B) if data integrity, then receive the XPE-FECn data, attempt to reduce the XPEn data, if reduce successfully, the data intercept sheet gets nowhere if reduce, and receives next packet.
1) when receiving the FAT sheet
CRC judgment data integrality,
A) if data integrity intercepts payload;
B) if corrupted data is ignored this payload, receive next data slice;
2) when receiving the file sheet
The intercepting payload;
Front end: FAT sheet sequential loop sends; The FAT sheet is pressed the file block sequence circulation and is sent; The file sheet is pressed sequential loop transmission in the piece.
Suppose: FAT sheet number is 200 (maximum FAT sheet number be 199); The sheet number is 512 in the blocks of files, (maximum file sheet number be 511).
If the current FAT sheet G (G＜199) that is received as, when receiving down a slice G1:
Be defaulted as G1=G+1 file sheet;
If G1＞G+1, then G+1 to G1FAT sheet is lost.
If the current file sheet M (M＜511) that is received as, when receiving down a slice:
Be defaulted as M+1 file sheet; Other situation is as follows.
1) be the FAT sheet, sheet number is N1
A) if N1=0 then is considered as these data for intercutting.
B) if N1＞0 then is considered as 0 to N1-1, the FAT sheet is lost.
2) file sheet in the presents piece, sheet N2
A) if N2＞M+1 then is considered as M+1 to N2-1 file sheet and loses.
B) if N2=M+1 then is considered as data and normally broadcasts, nothing is intercutted.
C) if N2＜M+1 then is considered as data exception.
D) if N2=511 then is considered as the presents piece and receives.
3) other blocks of files file sheet, sheet number is N3
A) if N3=0 then is considered as intercutting, if M＜511 presents piece M+1 to 511 a file sheet is lost.
B) if N3＞0 then is considered as intercutting, other blocks of files 0 to N3-1 file sheet is lost.
If the current file sheet M (M=511) that is received as, when receiving down a slice:
If this sheet is that blocks of files of last this document is defaulted as first first data of next file; If last blocks of files of the non-this document of this sheet is defaulted as first data of next blocks of files of this document, other situation is considered as intercutting.
If current being received as intercutted data slice P (non-piece of P or the last a slice of FAT file), when receiving down a slice P1:
The following a slice that is defaulted as the P1=P+1 numbering is intercutted data, if not then be considered as P+1 to P1-1 loss of data.
1) FAT sheet
Payload user data is saved in the storage medium by the sequence number order, if any losing sheet, then is stored as isometric file payload, receives to remedy in next round broadcasting, and is complete up to file.
2) file sheet
Payload user data is saved in the storage medium by the sequence number order, when having met a blocks of files unit, if file sheet data are imperfect in the piece, then carries out the LDGC computing, attempts reduction.If data can't reduce, in next round broadcasting, receive and remedy, complete up to file.
The invention provides a kind of terminal that allows and when receiving the data of data casting file pattern, allow the terminal recognition interpolation data still be the method for loss of data or damage, carry out necessary tolerant fail algorithm for terminal foundation is provided, avoided unnecessary erroneous judgement algorithm.The present invention will avoid same business datum formation to repeat to intercut in its data formation automatically, and the default sequence and the continuity that keep sequence number, the least unit that blocks of files and single or multiple data file are intercutted is defined as blocks of files, thereby make things convenient for terminal to receive and the transmit queue of differentiating the information of intercutting, strengthen user experience, under finite bandwidth, effectively raise ageing that business datum sends.
Claims (9)
1. a method that receives by CMMB data casting file mode terminal is characterized in that this method comprises the steps:
XPE/XPE-FEC decapsulation, verification with the reception of data casting file mode terminal; Mistake in file sheet/FAT sheet DRP data reception process, the identification of losing, intercutting; Avoid unnecessary fault-tolerant computing, and obtain release buffer memory.
2. XPE/XPE-FEC decapsulation as claimed in claim 1 and verification is characterized in that, the datacast transmissions mode: in proper order, follow, packet, forward error correction, CRC indication, FEC indication.
3. the state recognition in file sheet as claimed in claim 1, the FAT sheet DRP data reception process is characterized in that this method further comprises:
Continuity in the blocks of files of Data Receiving formation in continuity and the FAT file, as regular foundation, terminal realizes differentiating fast the state whether file sheet or FAT lose.Thereby the LDGC according to the GY/T220.5 standard carries out necessary reduction computing.
4. as an interior continuity as described in the claim 3, it is characterized in that this method comprises: with the data file sheet is that unit intercuts with the blocks of files, and therefore when receiving formation and intercut data, the interior data slice of blocks of files is still keeping continuity.
5. as the continuity in the FAT file as described in the claim 3, it is characterized in that this method comprises: the FAT file is to intercut the highest data of priority, and himself keeps continuity, and does not allow to be intercutted in the FAT formation.
6. the relation that continuity as claimed in claim 3 and data slice are lost is characterized in that this method further comprises: in the formation, the file sheet sequence number of identical file piece is continuous; As be inserted with FAT data queue, keep sequence number continuous equally; No file sheet formation is inserted in the FAT data queue; The file sheet data of not having other blocks of files in the file sheet formation of identical file piece.
7. the definition as intercutting as described in the claim 4 is characterized in that front end system adds in original default queue according to certain rule and meets certain rule queue, thereby forms a kind of process of new formation.
Such as claim 1 to 7 the description feature; terminal is when receiving data broadcasting; can discern the data that received and be normally or unusual; whether need fault-tolerant or the reduction computing; it is characterized in that terminal is differentiated: XPE/XPE-FEC packet, file sheet, FAT sheet, error correction indication, when anter sequence number, sheet sequence number, piece sequence number, CRC indication.
9. as any described data casting file mode terminal method of reseptance in the claim 1 to 8, it is characterized in that it is 0 that terminal recognition is intercutted first sequence number; Discontinuous or discontented unabridged version method definition rule will be regarded as loss of data; Terminal is defined according to GY/T 220.5 carry out necessary fault-tolerant and reduction computing.
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| CN2009101692884A CN101998278A (en) | 2009-08-26 | 2009-08-26 | Method of terminal receiving strategy based on CMMB (China Mobile Multimedia Broadcasting) data broadcasting channel |
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| CN2009101692884A CN101998278A (en) | 2009-08-26 | 2009-08-26 | Method of terminal receiving strategy based on CMMB (China Mobile Multimedia Broadcasting) data broadcasting channel |
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| US20090013363A1 (en) * | 2007-07-03 | 2009-01-08 | Samsung Electronics Co., Ltd. | Broadcast system and broadcast reception method and apparatus thereof |
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Addressee: Beijing Mobilevision Communications Co., Ltd. Wang Jinhui Document name: Notification of Patent Invention Entering into Substantive Examination Stage |
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Address after: 100025 Beijing city Chaoyang District eight Li Zhuang in 1 Lai Jin cultural and Creative Industrial Park building CN11 Applicant after: Beijing Mobilevision Communications Co., Ltd. Address before: 100025 Beijing city Chaoyang District eight Zhuang Xili No. 100 East Room 907 Applicant before: Beijing Mobilevision Communications Co., Ltd. |
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Application publication date: 20110330 |