CN101237476B - A file receiving method for mobile multimedia broadcasting system - Google Patents
A file receiving method for mobile multimedia broadcasting system Download PDFInfo
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- CN101237476B CN101237476B CN2008101013713A CN200810101371A CN101237476B CN 101237476 B CN101237476 B CN 101237476B CN 2008101013713 A CN2008101013713 A CN 2008101013713A CN 200810101371 A CN200810101371 A CN 200810101371A CN 101237476 B CN101237476 B CN 101237476B
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Abstract
The invention discloses a method for receiving files of a mobile multimedia broadcast system. The method is to catch a file fragment/reference fragment and corresponding resources identification, a block sequence, a fragment sequence and an updating sequence in a file fragment/reference fragment data packet transmitted in a broadcast channel before a mobile terminal correctly receives a file attribute table when receiving a data service of file format in the broadcast channel of a mobile multimedia broadcast system. The method adopts a pre-receiving mechanism for data files in a CMMB system, thereby greatly improving the efficiency of the terminal for receiving and analyzing the data files, and reducing the time taken by the terminal for receiving target files.
Description
Technical field
The present invention relates to a kind of document receiving method of mobile multimedia broadcast system, relate in particular to the document receiving method of a kind of CMMB (China Mobile Multimedia Broadcasting, CMMB) system.
Background technology
In recent years; Digital radio China mobile multi-media broadcasting technology and standard evolution are rapid; For example European DVB-H (Digital Video Broadcast Handheld; The digital video broadcast-handheld formula receives) system, MediaFLO (Media Forward Link Only, the single forward link of the medium) system of the U.S. and the CMMB system of China etc.
The data service of CMMB system is divided into two kinds of stream mode and file modes.The data service of stream mode provides with the mode of data flow, and the transmission of data flow has the sequential requirement usually, and comprising time tag indication or data flow inside during transmission has synchronous requirement; The data service of file mode provides with the mode of discrete file, and the transmission of data does not have the sequential requirement.
When carrying out the data traffic transmission of file mode, the transmitting terminal of data service sends with the mode of loop play file attribute table (File Attribute Table is called for short FAT) and file content in regular turn at the CMMB broadcast channel.The terminal receives complete file attribute table and corresponding file data and resolves the final reception of accomplishing file data.Wherein, file attribute table is used for the information such as formation, attribute, partitioning parameters of description document.
In the CMMB system, FAT and file data all are that unit broadcasts with the sheet.
Fig. 1 is cut apart the sketch map of transmission for the FAT file.
Fig. 2 is the encapsulating structure sketch map of FAT sheet.
As shown in Figure 1, the FAT file is split into n FAT sheet, and the span of n is 1～256; Each FAT sheet is encapsulated in the FAT sheet packet as shown in Figure 2 and transmits.
Comprise in the FAT sheet packet: resource identification (fixedly value is 0), when the anter sequence number, reserved field, leaf length, FAT sheet, CRC (Cyclic Redundancy Code, cyclic redundancy code) field; When the anter sequence number is 0, also comprise in the FAT sheet packet: upgrade sequence number, type of coding and last sheet sequence number.
Fig. 3 is cut apart the sketch map of transmission for file data.
Fig. 4 is the sketch map that file sheet and verification sheet are cut apart transmission.
Fig. 5 is the encapsulating structure sketch map of file sheet/verification sheet.
As shown in Figure 3, file data is split into a plurality of isometric file sheets, fills 0x00 when last file leaf length is not enough; A plurality of file sheet composing document pieces, according to the difference of the file sheet quantity in the blocks of files, blocks of files can be divided into two types of A, B, if the file sheet quantity of each blocks of files equates then have only the blocks of files of type A.As shown in Figure 4, the file error correction is undertaken by blocks of files, and the error correction data that obtains is called check block.Check block is divided into a plurality of verification sheets, and length is identical with the file sheet; Verification sheet and file sheet serial number.
Each file sheet or verification sheet are encapsulated in file sheet as shown in Figure 5/verification sheet packet and transmit.Comprise in file sheet/verification sheet packet: file sheet/verification sheet data packet head, file sheet or verification sheet.
File sheet/verification sheet data packet head comprises: resource identification, and the piece sequence number, the sheet sequence number is upgraded sequence number, reserved field; Wherein:
Resource identification is used for file of unique identification.
The piece sequence number is used to identify the sequence number of the affiliated blocks of files of current file sheet.
The sheet sequence number is used to identify the sequence number of current file sheet in blocks of files.
Upgrade the version number that sequence number is used to identify current resource.
The length of file sheet or verification sheet is specified by the FAT file, through file sheet and the verification sheet in the file sheet sequence number identification identical file piece.
Because in the CMMB system; FAT has described the attribute information of current broadcast file, comprising important file storage routing information, and the version information of file (consistent) with the renewal sequence number in file sheet/verification sheet packet; The content information of file, the carve information of file.At the terminal; Only get access to complete FAT; Could resolve the file sheet that receives; Know content information (quantity of file and size), the carve information (quantity of blocks of files and file sheet, size) of transfer files, carry out the reception of file sheet according to the corresponding memory space of above-mentioned information distribution.
Because the unsteadiness of wireless broadcast channel; The terminal possibly need a plurality of playback periods just can receive complete FAT; And the document receiving method of prior art is before receiving complete FAT; Can be for the file sheet does not distribute corresponding memory space, the file sheet packet that in corresponding playback period, receives will be dropped, and reduce the receiving efficiency at terminal.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiency of prior art, proposes a kind of mobile multimedia broadcast system that is applied to, can reduce the terminal the file time of reception, increase the document receiving method of file receiving efficiency.
In order to solve the problems of the technologies described above; The present invention provides a kind of document receiving method of mobile multimedia broadcast system; When the terminal receives in the data service of the enterprising style of writing part of the broadcast channel of mobile multimedia broadcast system pattern; Before correctly receiving the complete file attribute list, file sheet/verification sheet in the file sheet that sends in the buffer memory broadcast channel/verification sheet packet and corresponding resource identification, piece sequence number, sheet sequence number and renewal sequence number.
In addition, said terminal only buffer memory have the file sheet/verification sheet of same asset sign, piece sequence number and sheet sequence number but upgrade file sheet/verification sheet packaged in the maximum packet of sequence number and corresponding resource identification, piece sequence number, sheet sequence number and upgrade sequence number.
In addition, said file sheet/verification sheet data envelope is contained in the XPE/XPE-FEC data cell and transmits; Wherein, the XPE/XPE-FEC payload length field value in the XPE/XPE-FEC data cell is the file sheet/verification sheet length of data package value that wherein encapsulates;
When said terminal receives file sheet/verification sheet packet, the file sheet/verification sheet of wherein encapsulation is kept at dynamic assignment, length is in the memory space of difference of XPE/XPE-FEC payload length field value and file sheet/verification sheet data packet head length; And the corresponding relation of resource identification, piece sequence number, sheet sequence number, renewal sequence number and this memory space address in record this document sheet/verification sheet packet.
In addition, said terminal is after receiving the complete file attribute list, and this method also comprises the steps:
A: from this document attribute list, obtain the resource identification R and renewal sequence number V that respectively wait to receive file;
B: the resource identification of checking the file sheet/verification sheet of buffer memory with upgrade sequence number, if in the buffer memory resource identification be the corresponding renewal sequence number of file sheet/verification sheet of R less than V, then discharge corresponding memory space.
In addition, also comprise the steps: after the step B
C: according to the order of resource identification, piece sequence number, sheet sequence number to the file sheet/verification sheet of buffer memory or the buffer address pointer of file sheet/verification sheet sort.
In addition, also comprise the steps: after the step B
D: according to the file sheet quantity in carve information element that comprises in the said file attribute table and the buffer memory, the application residue waits to receive the required memory space of file sheet, remains the reception of file sheet/verification sheet.
In addition, comprise cyclic redundancy check field in the said XPE/XPE-FEC data cell;
Said terminal only buffer memory is passed through file sheet/verification sheet and corresponding resource identification, piece sequence number, the sheet sequence number in the errorless file sheet/verification sheet packet of said cyclic redundancy check field verification and is upgraded sequence number.
In sum, the present invention makes the efficient of terminal reception and parsing data file improve greatly through in the CMMB system, adopting the preparatory reception mechanism of data file, has shortened the time that the receiving target file is accomplished at the terminal.In addition, the preferred embodiments of the present invention are through carrying out verification to the renewal sequence number of file sheet/verification sheet before buffer memory, and file sheet/verification sheet are carried out CRC screen, and avoid out of date or wrong file sheet/verification sheet committed memory resource; In addition, the preferred embodiments of the present invention have proposed before correctly not receiving the complete file attribute list, from the XPE/XPE-FEC data cell, to obtain file sheet/verification sheet, and it is carried out the concrete grammar of buffer memory; In addition, the preferred embodiments of the present invention have proposed after receiving the complete file attribute list, discharge the concrete grammar of the shared memory space of scratch file sheet/verification sheet according to the renewal sequence number in the file attribute table; In addition, the preferred embodiments of the present invention have proposed to be convenient to carry out the follow-up forward error correction and the concrete grammar of file storage through the file sheet/verification sheet of buffer memory is sorted; In addition, the preferred embodiments of the present invention have proposed after receiving the complete file attribute list, carry out the concrete grammar that follow-up file sheet/verification sheet receives according to file attribute table.
Description of drawings
Fig. 1 is cut apart the sketch map of transmission for the FAT file;
Fig. 2 is the encapsulating structure sketch map of FAT sheet;
Fig. 3 is cut apart the sketch map of transmission for file data;
Fig. 4 is the sketch map that file sheet and verification sheet are cut apart transmission;
Fig. 5 is the encapsulating structure sketch map of file sheet/verification sheet;
Fig. 6 is the document receiving method flow chart of embodiment of the invention mobile multimedia broadcast system;
Fig. 7 is the encapsulating structure sketch map of XPE/XPE-FEC unit.
Embodiment
Because in the CMMB system; File sheet/verification sheet is to be encapsulated in XPE (eXtensible Protocol Encapsulation as payload; The extensible protocol encapsulation)/XPE-FEC (eXtensibleProtocol Encapsulation-Forward Error Corection; Extensible protocol encapsulation-forward error correction) transmits in the unit, and comprised the length information of the file sheet/verification sheet of its encapsulation in the XPE/XPE-FEC unit.Therefore, before receiving complete FAT, can receive and cache file sheet/verification sheet according to the length information of the file sheet/verification sheet that comprises in the XPE unit, to improve the receiving efficiency of file.
To combine accompanying drawing and embodiment that the present invention is elaborated below.
Fig. 6 is the document receiving method flow chart of embodiment of the invention mobile multimedia broadcast system.As shown in Figure 6, this method comprises the steps:
100: the professional beginning of file mode, Data Receiving is carried out at the CMMB broadcast channel in the terminal, when begin to receive be file sheet/verification sheet the time jump to step 103, otherwise carry out next step;
101: the terminal receives the FAT file at the CMMB broadcast channel;
A FAT file is made up of one or more FAT sheets; The terminal is when receiving the FAT sheet, and whether the FAT sheet that checking receives according to corresponding cyclic redundancy field (CRC 32 fields) is correct.
102: after the finishing receiving of epicycle FAT sheet, whether terminal judges correctly receives complete FAT file: if correctly do not receive complete FAT file, then carry out next step; Otherwise jump to step 108;
The number of the FAT sheet that FAT file comprises can be known according to the last sheet sequence number field of No. 0 FAT sheet packet.
103: reception and checking are encapsulated in the file sheet/verification sheet packet that transmits in the XPE/XPE-FEC unit;
As shown in Figure 7, file sheet/verification sheet packet is encapsulated in the XPE/XPE-FEC unit and transmits.
The XPE/XPE-FEC unit comprises the XPE/XPE-FEC head, XPE/XPE-FEC payload, CRC_32.
Comprise payload length field in the XPE/XPE-FEC head, this field is used to indicate the length of XPE/XPE-FEC payload, can calculate the length of file sheet/verification sheet according to this field:
Length=the payload length of file sheet/verification sheet-file sheet/verification sheet data packet head length;
In existing C MMB standard, file sheet/verification sheet data packet head length is 6.
The XPE/XPE-FEC payload is file sheet/verification sheet packet.
The CRC_32 field is the cyclic redundancy check value of XPE/XPE-FEC payload part, can verify according to the CRC_32 field whether the file sheet/verification sheet that is encapsulated in the XPE/XPE-FEC payload part is correct.
104: according to the resource identification in file sheet/verification sheet data packet head, piece sequence number, sheet sequence number have judged whether buffer memory corresponding file sheet/verification sheet is if buffer memory is then carried out next step; Otherwise jump to step 106;
105: judge whether that according to the renewal sequence number field in file sheet/verification sheet data packet head corresponding file sheet/verification sheet upgrades; If upgrade, then discharge the file sheet/verification sheet of former buffer memory and carry out next step, otherwise jump to step 107;
Judge whether file sheet/verification sheet has upgraded and be exactly to judge upgrade sequence number value and whether upgrade sequence number value greater than the correspondence of the file sheet/verification sheet with same asset sign of this locality buffer memory; If greater than, then represent the file sheet/verification sheet of file sheet/verification sheet that newly receives for upgrading.
106: dynamically apply for memory space according to file sheet/verification leaf length, file sheet/verification sheet that buffer memory receives, and use the resource identification in file sheet/verification sheet data packet head, piece sequence number and this memory space of sheet sequence number sign; Just write down the corresponding relation of resource identification, piece sequence number, sheet sequence number and memory space address; The renewal sequence number of record this document sheet/verification sheet;
107: whether the reception of judging epicycle file sheet/verification sheet finishes:
If finish, then jump to step 101, begin to carry out the reception of next round FAT file;
Otherwise, jump to step 103, continue to receive subsequent file sheet/verification sheet.
108: from the FAT file, obtain the resource identification R that respectively waits to receive file, and upgrade sequence number V accordingly;
109: put the file sheet/verification sheet of buffer memory in order; Contrast all resource identifications and number be file sheet/verification sheet of R; If its upgraded edition this shop, thinks then that this document sheet/verification sheet is expired with respect to this FAT file less than V, therefore discharge the cache resources of this document sheet/verification sheet.
Through after the above-mentioned arrangement, the file sheet/verification sheet in the buffer memory all is effective file sheet/verification sheet.
110: to the effective document sheet/verification sheet of buffer memory according to its resource identification; The piece sequence number; The sheet sequence number is redirected; Promptly the file sheet/verification sheet of buffer memory or the buffer address pointer of file sheet/verification sheet are sorted, so that carry out follow-up operations such as FEC error correction according to the order of resource identification, piece sequence number, sheet sequence number;
111: according to the quantity of the existing file sheet in the carve information that comprises in the FAT file (SegmentationInfo) element and the buffer memory, the application residue waits to receive the required memory space of file sheet;
112: receive residue file sheet, carry out the FEC error correction, accomplish the reception of file.
When adopting document receiving method of the present invention; The terminal should be provided with rational cache size higher limit according to its other resources situation; Before receiving the complete file attribute list; When the shared cache size of file sheet/verification sheet was about to surpass above-mentioned higher limit, the terminal can stop to receive new file sheet/verification sheet, or uses the new file sheet/verification sheet that receives to replace the old file sheet/verification sheet of the equal number of buffer memory; Avoid not receiving in a long time under the situation of complete file attribute list, take the mass of terminals cache resources for a long time.
By on can know, adopt document receiving method of the present invention, before complete reception FAT; Reasonable buffer memory is carried out to the file sheet that correctly receives in the terminal; Treat after the complete reception FAT file sheet in the buffer memory to be redirected (ordering), finally shorten file and receive the required time.
In addition, except being applied to the CMMB system, method of the present invention is equally applicable to other mobile multimedia broadcast system.
Claims (7)
1. the document receiving method of a mobile multimedia broadcast system; It is characterized in that; When the terminal receives in the data service of the enterprising style of writing part of the broadcast channel of mobile multimedia broadcast system pattern; Before correctly receiving the complete file attribute list, file sheet/verification sheet in the file sheet that sends in the buffer memory broadcast channel/verification sheet packet and corresponding resource identification, piece sequence number, sheet sequence number and renewal sequence number;
Said file sheet/verification sheet data envelope is contained in the XPE/XPE-FEC data cell and transmits; Wherein, the XPE/XPE-FEC payload length field value in the XPE/XPE-FEC data cell is the file sheet/verification sheet length of data package value that wherein encapsulates;
When said terminal receives file sheet/verification sheet packet, the file sheet/verification sheet of wherein encapsulation is kept at dynamic assignment, length is in the memory space of difference of XPE/XPE-FEC payload length field value and file sheet/verification sheet data packet head length; And the corresponding relation of resource identification, piece sequence number, sheet sequence number, renewal sequence number and this memory space address in record this document sheet/verification sheet packet.
2. the method for claim 1 is characterized in that,
Said terminal only buffer memory has the file sheet/verification sheet of same asset sign, piece sequence number and sheet sequence number but upgrades file sheet/verification sheet packaged in the maximum packet of sequence number and corresponding resource identification, piece sequence number, sheet sequence number and renewal sequence number.
3. according to claim 1 or claim 2 method is characterized in that said terminal is after receiving the complete file attribute list, and this method also comprises the steps:
A: from this document attribute list, obtain the resource identification R and renewal sequence number V that respectively wait to receive file;
B: the resource identification of checking the file sheet/verification sheet of buffer memory with upgrade sequence number, if in the buffer memory resource identification be the corresponding renewal sequence number of file sheet/verification sheet of R less than V, then discharge corresponding memory space.
4. method as claimed in claim 3 is characterized in that, also comprises the steps: after the step B
C: according to the order of resource identification, piece sequence number, sheet sequence number to the file sheet/verification sheet of buffer memory or the buffer address pointer of file sheet/verification sheet sort.
5. method as claimed in claim 3 is characterized in that, also comprises the steps: after the step B
D: according to the file sheet quantity in carve information element that comprises in the said file attribute table and the buffer memory, the application residue waits to receive the required memory space of file sheet, remains the reception of file sheet/verification sheet.
6. method as claimed in claim 4 is characterized in that, also comprises the steps: after the step C
D: according to the file sheet quantity in carve information element that comprises in the said file attribute table and the buffer memory, the application residue waits to receive the required memory space of file sheet, remains the reception of file sheet/verification sheet.
7. the method for claim 1 is characterized in that,
Comprise cyclic redundancy check field in the said XPE/XPE-FEC data cell;
Said terminal only buffer memory is passed through file sheet/verification sheet and corresponding resource identification, piece sequence number, the sheet sequence number in the errorless file sheet/verification sheet packet of said cyclic redundancy check field verification and is upgraded sequence number.
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| CN2008101013713A CN101237476B (en) | 2008-03-05 | 2008-03-05 | A file receiving method for mobile multimedia broadcasting system |
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| CN2008101013713A CN101237476B (en) | 2008-03-05 | 2008-03-05 | A file receiving method for mobile multimedia broadcasting system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101552651B (en) * | 2009-01-08 | 2012-05-23 | 北京创毅视讯科技有限公司 | Data file receiving method and device in mobile multimedia broadcasting system |
| CN101656682B (en) * | 2009-06-12 | 2011-09-21 | 中兴通讯股份有限公司 | Method and system for processing mobile multimedia data broadcasting services |
| CN101998278A (en) * | 2009-08-26 | 2011-03-30 | 北京中传视讯科技有限公司 | Method of terminal receiving strategy based on CMMB (China Mobile Multimedia Broadcasting) data broadcasting channel |
| CN102088330A (en) * | 2009-12-02 | 2011-06-08 | 北京泰美世纪科技有限公司 | Method and device for generating terminal test signal of CMMB system |
| CN101860799A (en) * | 2010-05-24 | 2010-10-13 | 中兴通讯股份有限公司 | Transmission and receiving method and device for interactive service files |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056252A (en) * | 2007-06-07 | 2007-10-17 | 中兴通讯股份有限公司 | Transmission method of compression file |
| CN101083531A (en) * | 2007-07-23 | 2007-12-05 | 中兴通讯股份有限公司 | Method for transmitting, accessing authority hierarchical content in data broadcast and file scrambling method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056252A (en) * | 2007-06-07 | 2007-10-17 | 中兴通讯股份有限公司 | Transmission method of compression file |
| CN101083531A (en) * | 2007-07-23 | 2007-12-05 | 中兴通讯股份有限公司 | Method for transmitting, accessing authority hierarchical content in data broadcast and file scrambling method |
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