CN101272221B - Transmission, receiving method and device of file data - Google Patents
Transmission, receiving method and device of file data Download PDFInfo
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- CN101272221B CN101272221B CN200810094118XA CN200810094118A CN101272221B CN 101272221 B CN101272221 B CN 101272221B CN 200810094118X A CN200810094118X A CN 200810094118XA CN 200810094118 A CN200810094118 A CN 200810094118A CN 101272221 B CN101272221 B CN 101272221B
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Abstract
The invention relates to a transmission and receiving method and device for document data. The receiving method comprises the following steps: A, after a terminal receives a document piece transmission packet and a checking piece transmission packet of the document data, a circulating redundancy checking field is utilized to carry out circulating redundancy checking on the document piece or the checking piece sealed in the transmission packet; B, when the sum of the amounts of the document piece and the checking piece that have successful circulating redundancy checking in a same document block reaches a preset error correcting proportion experience value, the terminal users the document piece and the checking piece that have successful circulating redundancy checking to carry out forwarderror correcting and writes the document block data into the document after the error correcting is succeed. When the method and the device of the invention are adopted, the receiving terminal can independently carry out checking slicing data after receiving the data of each document piece and each checking piece so as to judge whether each document piece and each checking piece are received accurately or not; thereby leading the terminal to effectively carry out subsequent document error correcting repairing treatment.
Description
Technical field
The invention belongs to filed of mobile multimedia broadcasting, relate in particular to a kind of file data transmission, method of reseptance and device of mobile multimedia broadcast system.
Background technology
Mobile Multimedia Broadcasting is the Play Technique for Multimedia of a kind of broadcast mode of rising in recent years.By hand-held terminal, the user can watch multimedia services such as TV under the situation of high-speed mobile.Terminal receives the multimedia service programme by wireless broadcast channel, selects the channel of having the right to watch, thereby can receive and play the multi-medium data of this channel, is implemented in and sees TV on the portable terminal.
China Mobile multimedia broadcasting (CMMB, China Mobile Multimedia Broadcasting) technology is the China mobile multi-media broadcasting technology that latest development is got up, based on OFDM (OFDM, Orthogonal Frequency Division Multiplexing) modulation technique, adopt the downlink broadcast mode that mobile multi-media service is issued receiving terminal, in order to save the power consumption of receiving terminal, adopt time division duplex (TDD, Time Division Duplex) mode to send multimedia broadcast business data.
The CMMB broadcast channel frame is made up of control logic channel (hereinafter to be referred as control channel) and service logical channels (hereinafter to be referred as Traffic Channel).The 1st time slot (time slot 0) of CMMB broadcast channel is control channel, is used for communicating control information; Other time slot is a Traffic Channel, is used to transmit the mobile multi-media service data.
Control information and multimedia service data send on control channel and Traffic Channel respectively with the form of multiplexed frame.Each multiplexed frame accounts for an integer time slot, is made up of multiplex frame head and load.Wherein, the load of control channel multiplexed frame is made up of a plurality of control information tables; The load of Traffic Channel multiplexed frame is made up of a plurality of multiplexed sub frames, and the quantity of multiplexed sub frame is indicated in multiplex frame head; Each multiplexed sub frame is made up of multiplexed sub frame head, video-frequency band, audio section and data segment, and each section (video-frequency band, audio section and data segment) is made up of paragraph header and a plurality of segment unit.
It is a critical function of Mobile Multimedia Broadcasting that file is downloaded, the transmission means and the business model of specific definition file comprise to terminal providing as services such as news content, government affairs political VIP, commercial matters information, amusement game, weather forecast and file downloads among the standard GY/T 220.5-2008 " Mobile Multimedia Broadcasting the 5th part: data broadcasting ".Supported file type comprises HTML (Hypertext MarkupLanguage, HTML), XML (eXtensible Markup Language, extend markup language) etc.
In this standard, defined a kind of forward error correction (Forward ErrorCorrection is called for short FEC) algorithm---low density generated matrix code (LDGC, Low DensityGenerator-matrix Code) algorithm of file division transmission.In radio network, the checking data that utilizes forward error correction algorithm to generate carries out error correction to the mistake that may occur, and is not needing to finish the correct transmission of file under the interactive situation of repairing.
The LDGC algorithm requires receiving terminal whether each burst is carried out record by correct the reception, if the accepting state of the All Files burst of a blocks of files is correct, then can this document piece not carried out repair process; This just requires before calling the LDGC error correction algorithm, must have a kind of method to allow terminal know whether and correctly receive each fragment data.The XPE that describes among the GY/T 220.5-2008 (eXtensibleProtocol Encapsulation, the extensible protocol encapsulation) CRC_32 (the Cyclic RedundancyCheck 32 of layer, 32 cyclic redundancy check (CRC)) verification and RS (Reed Solomon, reed-solomon) forward error correction can guarantee this point.But stipulate in this standard simultaneously: the CRC_32 verification of XPE layer and RS forward error correction all are optional; Therefore receiving terminal can't not judge whether the fragment data of reception is correct when using the chip that comprises above-mentioned XPE layer verification/forward error correction function, and then may cause the LDGC error correction normally not used, and finally causes the file can not be by correct reconstruct.
Therefore, need additionally provide a kind of file data transmission, method of reseptance and device of mobile multimedia broadcast system, the file verification function can be provided when the terminal use uses the file mode data service of mobile media broadcasting network system effectively.
Summary of the invention
Technical problem to be solved by this invention is, a kind of file data transmission, method of reseptance and device of mobile multimedia broadcast system are provided, the verifying function to file sheet, verification sheet can be provided when the terminal use uses the file mode data service of mobile media broadcasting network system effectively.
In order to solve the problems of the technologies described above, the invention provides a kind of method of reseptance of file data, this method comprises the steps:
A: terminal uses cyclic redundancy check field wherein that file sheet or the verification sheet that encapsulates in this transmission package carried out cyclic redundancy check (CRC) after file sheet transmission package that receives file data and verification sheet transmission package;
B: when the quantity sum of the file sheet of cyclic redundancy check (CRC) success in the identical file piece and verification sheet reaches predefined error correction ratio empirical value, terminal uses the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
In addition, also comprise the steps: between steps A and the B
A1: file sheet and verification sheet to the cyclic redundancy check (CRC) success carry out mark;
Among the step B, according to file sheet that is labeled as the cyclic redundancy check (CRC) success in the identical file piece and verification sheet quantity sum, and the file sheet that comprises in this document piece and verification sheet sum judge whether to reach described error correction ratio empirical value.
In addition, described terminal receives described file sheet transmission package and verification sheet transmission package from the CMMB broadcast channel.
The present invention also provides a kind of transmission method of file data, the transmitting terminal of file data carries out cyclic redundancy check (CRC) respectively to sent each the file sheet and the verification sheet of file data, and cyclic redundancy check value is encapsulated in corresponding file sheet transmission package or the verification sheet transmission package by the transmission of CMMB broadcast channel.
In addition, this method also comprises following steps:
A: the receiving terminal of file data uses the cyclic redundancy check field that wherein comprises that file sheet or the verification sheet that encapsulates in this transmission package carried out cyclic redundancy check (CRC) after receiving described file sheet transmission package and verification sheet transmission package;
B: when the quantity sum of the file sheet of cyclic redundancy check (CRC) success in the identical file piece and verification sheet reaches predefined error correction ratio empirical value, described receiving terminal uses the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
The present invention also provides a kind of receiving system of file data, comprises receiving element, CRC check buffer unit, fec decoder unit; Wherein:
Described receiving element is used to receive the file sheet transmission package and the verification sheet transmission package of file data, and exports file sheet, verification sheet and the corresponding CRC check value of wherein encapsulation;
Described CRC check buffer unit uses the described CRC check value of described receiving element output that corresponding file sheet, verification sheet are carried out cyclic redundancy check (CRC), and the file sheet of buffer memory cyclic redundancy check (CRC) success and verification sheet;
Described fec decoder unit is used for judging whether the file sheet of identical file piece cyclic redundancy check (CRC) success and the quantity sum of verification sheet have reached predefined error correction ratio empirical value; If, then use the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
In addition, described CRC check buffer unit carries out mark to the file sheet and the verification sheet of cyclic redundancy check (CRC) success;
Described fec decoder unit is according to file sheet that is labeled as the cyclic redundancy check (CRC) success in the identical file piece and verification sheet quantity sum, and the file sheet that comprises in this document piece and verification sheet sum judge whether to reach described error correction ratio empirical value.
In addition, described receiving element receives described file sheet transmission package and verification sheet transmission package from the CMMB broadcast channel.
The present invention also provides a kind of transmitting device of file data, comprises: FEC coding unit, transmitting element, CRC check encapsulation unit; Wherein:
Described FEC coding unit is used to receive the file sheet of file data to be sent, and the file sheet that belongs to a blocks of files is carried out the FEC coding, generates the verification sheet; And output file sheet and corresponding check sheet;
Described CRC check encapsulation unit is used to receive the file sheet and the verification sheet of described FEC coding unit output; And each file sheet and verification sheet carried out CRC check, generate the CRC check value; File sheet and corresponding CRC check value, verification sheet and corresponding CRC check value be encapsulated in respectively in file sheet transmission package or the verification sheet transmission package export;
Described transmitting element is used to receive the file sheet transmission package and the verification sheet transmission package of described CRC check encapsulation unit output, and it is transmitted by the CMMB broadcast channel.
In addition, this device also comprises receiving element, CRC check buffer unit, fec decoder unit; Wherein:
Described receiving element is used to receive described file sheet transmission package and verification sheet transmission package, and exports file sheet, verification sheet and the corresponding CRC check value of wherein encapsulation;
Described CRC check buffer unit is used to use the described CRC check value of described receiving element output that corresponding file sheet, verification sheet are carried out cyclic redundancy check (CRC), and the file sheet of buffer memory cyclic redundancy check (CRC) success and verification sheet;
Described fec decoder unit is used for judging whether the file sheet of identical file piece cyclic redundancy check (CRC) success of described CRC check buffer unit storage and the quantity sum of verification sheet have reached predefined error correction ratio empirical value; If, then use the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
Adopt method of the present invention and device, receiving terminal can carry out the verification of fragment data separately when receiving each file sheet, verification sheet data, judge with this whether each file sheet, verification sheet are correctly received, thereby make terminal carry out follow-up file error correction repair process effectively.
Description of drawings
Fig. 1 is cut apart the transmission schematic diagram for file in the mobile multi-media broadcasting data broadcast standard;
Fig. 2 is the transmission schematic diagram of file sheet/verification sheet in the mobile multi-media broadcasting data broadcast standard;
Fig. 3 is the encapsulating structure schematic diagram of embodiment of the invention file sheet/verification sheet transmission package;
Fig. 4 is the method for reseptance flow chart of embodiment of the invention file data;
Fig. 5 is the transmitting device schematic diagram of embodiment of the invention file data.
Embodiment
Basic ideas of the present invention are, transmission encapsulating structure (being file sheet transmission package and verification sheet transmission package) to file sheet and verification sheet improves: increase CRC 32 check field of file sheet and verification sheet data (being referred to as the sheet data) being carried out cyclic redundancy check (CRC), this check field is that all data except that these CRC 32 fields in file sheet transmission package/verification sheet transmission package are carried out the check value that cyclic redundancy check (CRC) obtains.When receiving terminal receives file sheet or verification sheet transmission package, use CRC 32 fields wherein comprise that it is carried out cyclic redundancy check (CRC), and be correct accepting state the sheet Data Identification of verification succeeds; Judge can utilize the file sheet data that received and checking data to carry out forward error correction after (after promptly correctly receiving the file sheet and verification sheet of some in the blocks of files), use checking data (each verification sheet) that file data (each file sheet) is carried out forward error correction, and after the error correction success, the blocks of files data are write in the file.If cyclic redundancy check (CRC) failure is then thought the sheet data exception of this document sheet or verification sheet it to be designated wrong accepting state.The fragment data of verification failure both can abandon, and also can preserve earlier, utilized follow-up forward error correction mechanism to carry out correction process.
Below in conjunction with specific embodiments and the drawings technique scheme of the present invention is described in detail.
As shown in Figure 1, in mobile multimedia broadcast system, file adopts the method for piecemeal, burst to transmit.File to be transmitted is divided into some isometric file sheets by certain length, and last file leaf length deficiency is answered padding data 0x00.
A plurality of file sheet composing document pieces, according to the difference of the file sheet quantity that wherein comprises, blocks of files can be divided into two types of A, B.If the file sheet quantity that comprises in the All Files piece is identical, then has only one type blocks of files, i.e. type A blocks of files.
In order to realize reliable transfer of data, blocks of files is carried out FEC coding (adopting the LDGC algorithm usually), and the checking data that the FEC coding generates is divided into a plurality of verification sheets, and the length of verification sheet is identical with the file sheet, the check block of verification sheet composition that blocks of files generates, as shown in Figure 2.
Through the mobile media broadcasting network transmission, the encapsulating structure of file sheet/verification sheet transmission package as shown in Figure 3 after file sheet/test film was packed.Use piece sequence number and file sheet of sheet sequence number unique identification or verification sheet in file sheet/verification sheet transmission package, mobile multi-media broadcast terminal can be discerned file sheet and the verification sheet that receives according to piece sequence number and sheet sequence number.
The concrete implication of 32 CRC 32 fields that increase in file sheet shown in Figure 3/verification sheet transmission package is: all data except that these CRC 32 fields in this document sheet/verification sheet transmission package are carried out the check value that cyclic redundancy check (CRC) obtains.The decoding model of CRC 32 fields can be referring to GY/T 220.2-2006 appendix A.Other field in file sheet/verification sheet transmission package is followed the regulation in the GY/T 220.5-20086.1 joint.
The piecemeal burst information of file is transmitted in file attribute table (FAT), and specific definition sees the following form.
| Field | Semantic |
| Slice_length | The size of file sheet, unsigned Int type, unit is a byte, length is less than 65530. |
| A_block_count | The quantity of type A blocks of files, unsigned Int type, span 0～1023. |
| Field | Semantic |
| B_block_count | The quantity of type B part piece, unsigned Int type, span 0～1023. |
| Total_block_count | The blocks of files sum, unsigned Int type equals A_block_count and B_block_count sum. |
| Slice_count_for_A | The quantity of file sheet in the type A blocks of files, unsigned Short type, span 0～8191, optional. |
| Slice_count_for_B | The quantity of file sheet in the type B blocks of files, unsigned Short type, span 0～8191, optional. |
| Fec_slice_count_for_A | The quantity of type A blocks of files verification sheet, unsigned Short type, span 0～8191, optional. |
| Fec_slice_count_for_B | The quantity of type B blocks of files verification sheet, unsigned Short type, span 0～8191, optional. |
Table 1
Usually, mobile multi-media broadcast terminal begins to receive needs to carry out following processing before the data service of file mode:
(1) from file attribute table (FAT), obtains the information such as size of blocks of files quantity, sheet quantity and the sheet of file;
Wherein, blocks of files quantity is total_block_count;
Sheet quantity is file sheet quantity and the verification sheet quantity sum that comprises in the blocks of files; For type A blocks of files, the file sheet quantity that comprises is slice_count_for_A, and the verification sheet quantity that comprises is fec_slice_count_for_A; For the type B blocks of files, the file sheet quantity that comprises is slice_count_for_B, and the verification sheet quantity that comprises is fec_slice_count_for_B.
(2) prepare to receive blocks of files, file sheet, and application is used for writing down the buffer area of all fragment data accepting states of each piecemeal;
Because the burst quantity that class piece A blocks of files comprises is always many than the burst quantity that the type B blocks of files comprises, so preserve the size of buffer memory slice_recvd_stat of all burst accepting states of each piecemeal, the accepting state that can be enough to hold (slice_count_for_A+fec_slice_count_for_A) individual burst gets final product.The accepting state of certain burst can use one to represent, also can use a byte to represent.
Fig. 4 is the method for reseptance flow chart of embodiment of the invention file data, and as shown in the figure, this method comprises following steps:
Step 401～403: after receiving certain file sheet/verification sheet transmission package, judge whether the sheet data (file sheet or verification sheet) that encapsulate in this transmission package are the data of current needs, are then to continue; Otherwise abandon, change step 401 over to, continue to receive file sheet/verification sheet transmission package;
Step 404～406: according to the CRC_32 field in file sheet/verification sheet transmission package the sheet data of wherein encapsulation are carried out cyclic redundancy check (CRC), the verification succeeds then sheet accepting state of this sheet data correspondence is set to correct reception, otherwise jumps to step 411;
Step 407: judging whether to utilize the file sheet and the verification sheet (being that accepting state is the correct file sheet/verification sheet that receives) that correctly receive to carry out forward error correction, is then to continue, and carries out otherwise jump to step 401;
The foundation of carrying out above-mentioned judgement can be: whether the file sheet that belongs to a blocks of files that correctly receives and the quantity sum of verification sheet have reached the ratio that can carry out forward error correction, and this ratio is an empirical value (being called error correction ratio empirical value).
For example, error correction ratio empirical value can be 90%, promptly when the quantity of file sheet that receives and verification sheet reached the file sheet that comprises in the respective file piece and verification sheet sum 90% the time, then judge and can carry out forward error correction.
Step 408～409: use current file sheet that correctly receives and verification sheet to carry out forward error correction (promptly carrying out fec decoder), if error correction success (promptly successfully decoding the All Files sheet in this document piece) then execution in step 410 are carried out otherwise change step 401 over to;
Step 410: this document blocks of data (being the All Files sheet of this document piece) is write file, and this method finishes;
Step 411: abandon this sheet data; Perhaps preserve this sheet data, and the sheet accepting state of this sheet data correspondence is set to wrong the reception; Jumping to step 401 then carries out.
Because file being carried out a precondition of forward error correction is to guarantee that the file sheet, the verification sheet data that receive are correct, and the present invention has added important verification link just in file reception and error correction restructuring procedure, thereby make that above-mentioned precondition is guaranteed, solved the deficiency that prior art exists.
Fig. 5 is the transmitting device schematic diagram of embodiment of the invention file data.As shown in Figure 5, the transmitting device of file data is divided into transmitting terminal and receiving terminal.
Transmitting terminal comprises: FEC coding unit, CRC check encapsulation unit, transmitting element.Wherein:
The FEC coding unit is used to receive the file sheet of file data to be sent, and the file sheet that belongs to a blocks of files is carried out FEC coding (can adopt the LDGC algorithm), generates the verification sheet; And output file sheet and corresponding check sheet;
The CRC check encapsulation unit is used to receive file sheet and the verification sheet that the FEC coding unit is exported, and each file sheet and verification sheet is carried out CRC check, generates the CRC check value; File sheet and corresponding CRC check value, verification sheet and corresponding CRC check value be encapsulated in respectively in file sheet transmission package or the verification sheet transmission package export;
Transmitting element is used to receive file sheet transmission package and the verification sheet transmission package that the CRC check encapsulation unit is exported, and it is sent to receiving terminal by the CMMB broadcast channel.
Receiving terminal comprises: receiving element, CRC check buffer unit, fec decoder unit.Wherein:
Receiving element is used for receiving file sheet transmission package and the verification sheet transmission package that transmitting element sends at the CMMB broadcast channel, and exports file sheet, verification sheet and the corresponding CRC check value that receives;
The CRC check buffer unit is used to use the described CRC check value of receiving element output corresponding file sheet, verification sheet to be carried out cyclic redundancy check (CRC), the file sheet of buffer memory cyclic redundancy check (CRC) success and verification sheet;
The CRC check buffer unit also can buffer memory all the file sheet that receives and verification sheets, and the accepting state of the file sheet of cyclic redundancy check (CRC) success and verification sheet is set to correct reception.
The fec decoder unit is used for judging whether that the file sheet that correctly receives and the verification sheet (being that accepting state is correct file sheet and the verification sheet that receives) that can utilize the CRC check buffer unit to store carry out forward error correction; If of course, then use current file sheet that correctly receives and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data (being the All Files sheet of this document piece) is write file.
The fec decoder unit carries out the foundation that above-mentioned judgement adopts: whether the file sheet that belongs to a blocks of files that correctly receives and the quantity sum of verification sheet have reached the ratio that can carry out forward error correction, and this ratio is an empirical value (being called error correction ratio empirical value).
For example, error correction ratio empirical value can be 90%, promptly when the quantity of file sheet that receives and verification sheet reached the file sheet that comprises in the respective file piece and verification sheet sum 90% the time, judgement can be carried out forward error correction.
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 (10)
1. the method for reseptance of a file data is characterized in that, this method comprises the steps:
A: terminal is after file sheet transmission package that receives file data and verification sheet transmission package, described terminal uses the cyclic redundancy check field in the described file sheet transmission package that the file sheet that encapsulates in the described file sheet transmission package is carried out cyclic redundancy check (CRC), and described terminal uses the cyclic redundancy check field in the described verification sheet transmission package that the verification sheet that encapsulates in the described verification sheet transmission package is carried out cyclic redundancy check (CRC);
B: when the quantity sum of the file sheet of cyclic redundancy check (CRC) success in the identical file piece and verification sheet reaches predefined error correction ratio empirical value, terminal uses the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
2. the method for claim 1 is characterized in that, also comprises the steps: between steps A and the B
A1: file sheet and verification sheet to the cyclic redundancy check (CRC) success carry out mark;
Among the step B, according to file sheet that is labeled as the cyclic redundancy check (CRC) success in the identical file piece and verification sheet quantity sum, and the file sheet that comprises in this document piece and verification sheet sum judge whether to reach described error correction ratio empirical value.
3. the method for claim 1 is characterized in that,
Described terminal receives described file sheet transmission package and verification sheet transmission package from China Mobile multimedia broadcasting CMMB broadcast channel.
4. the transmission method of a file data is characterized in that,
The transmitting terminal of file data carries out cyclic redundancy check (CRC) respectively to sent each the file sheet and the verification sheet of file data, and cyclic redundancy check field is encapsulated in corresponding file sheet transmission package or the verification sheet transmission package by the transmission of China Mobile multimedia broadcasting CMMB broadcast channel.
5. method as claimed in claim 4 is characterized in that, this method also comprises following steps:
A: the receiving terminal of file data is after receiving described file sheet transmission package and verification sheet transmission package, the receiving terminal of described file data uses the cyclic redundancy check field that comprises in the described file sheet transmission package that the file sheet that encapsulates in the described file sheet transmission package is carried out cyclic redundancy check (CRC), and the receiving terminal of described file data uses the cyclic redundancy check field that comprises in the described verification sheet transmission package that the verification sheet that encapsulates in the described verification sheet transmission package is carried out cyclic redundancy check (CRC);
B: when the quantity sum of the file sheet of cyclic redundancy check (CRC) success in the identical file piece and verification sheet reaches predefined error correction ratio empirical value, described receiving terminal uses the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
6. the receiving system of a file data comprises receiving element, it is characterized in that, this device also comprises: cyclic redundancy check (CRC) verification buffer unit, forward error correction fec decoder unit; Wherein:
Described receiving element is used to receive the file sheet transmission package and the verification sheet transmission package of file data, and exports file sheet, verification sheet and the corresponding CRC check field of wherein encapsulation;
Described CRC check buffer unit uses the described CRC check field of described receiving element output that corresponding file sheet, verification sheet are carried out cyclic redundancy check (CRC), and the file sheet of buffer memory cyclic redundancy check (CRC) success and verification sheet;
Described fec decoder unit is used for judging whether the file sheet of identical file piece cyclic redundancy check (CRC) success and the quantity sum of verification sheet have reached predefined error correction ratio empirical value; If, then use the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
7. device as claimed in claim 6 is characterized in that,
Described cyclic redundancy check (CRC) verification buffer unit carries out mark to the file sheet and the verification sheet of cyclic redundancy check (CRC) success;
Described forward error correction fec decoder unit is according to file sheet that is labeled as the cyclic redundancy check (CRC) success in the identical file piece and verification sheet quantity sum, and the file sheet that comprises in this document piece and verification sheet sum judge whether to reach described error correction ratio empirical value.
8. device as claimed in claim 6 is characterized in that,
Described receiving element receives described file sheet transmission package and verification sheet transmission package from China Mobile multimedia broadcasting CMMB broadcast channel.
9. the transmitting device of a file data comprises: forward error correction FEC coding unit, and transmitting element is characterized in that, this device also comprises: cyclic redundancy check (CRC) verification encapsulation unit; Wherein:
Described FEC coding unit is used to receive the file sheet of file data to be sent, and the file sheet that belongs to a blocks of files is carried out the FEC coding, generates the verification sheet; And output file sheet and corresponding check sheet;
Described CRC check encapsulation unit is used to receive the file sheet and the verification sheet of described FEC coding unit output; And each file sheet and verification sheet carried out CRC check, generate the CRC check field; File sheet and corresponding CRC check field, verification sheet and corresponding CRC check field be encapsulated in respectively in file sheet transmission package or the verification sheet transmission package export;
Described transmitting element is used to receive the file sheet transmission package and the verification sheet transmission package of described CRC check encapsulation unit output, and it is transmitted by China Mobile multimedia broadcasting CMMB broadcast channel.
10. device as claimed in claim 9 is characterized in that,
This device also comprises receiving element, cyclic redundancy check (CRC) verification buffer unit, forward error correction fec decoder unit; Wherein:
Described receiving element is used to receive described file sheet transmission package and verification sheet transmission package, and exports file sheet, verification sheet and the corresponding CRC check field of wherein encapsulation;
Described CRC check buffer unit is used to use the described CRC check field of described receiving element output that corresponding file sheet, verification sheet are carried out cyclic redundancy check (CRC), and the file sheet of buffer memory cyclic redundancy check (CRC) success and verification sheet;
Described fec decoder unit is used for judging whether the file sheet of identical file piece cyclic redundancy check (CRC) success of described CRC check buffer unit storage and the quantity sum of verification sheet have reached predefined error correction ratio empirical value; If, then use the file sheet of described cyclic redundancy check (CRC) success and verification sheet to carry out forward error correction, after the forward error correction success this document blocks of data is write file.
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| CN200810094118XA CN101272221B (en) | 2008-05-04 | 2008-05-04 | Transmission, receiving method and device of file data |
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| CN200810094118XA CN101272221B (en) | 2008-05-04 | 2008-05-04 | Transmission, receiving method and device of file data |
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| CN101272221B true CN101272221B (en) | 2010-08-18 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| US8516137B2 (en) * | 2009-11-16 | 2013-08-20 | Microsoft Corporation | Managing virtual hard drives as blobs |
| 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 |
| CN101834700A (en) * | 2010-05-12 | 2010-09-15 | 北京邮电大学 | Unidirectional reliable transmission method and transceiving device based on data packets |
| CN102281121B (en) * | 2010-06-13 | 2014-10-29 | 中兴通讯股份有限公司 | Method, equipment and system for transmitting and verifying data file |
| CN109150385B (en) * | 2017-06-27 | 2022-06-28 | 中兴通讯股份有限公司 | Broadcast data transmission method, apparatus, device, and computer-readable storage medium |
| CN109167965B (en) * | 2018-09-28 | 2020-12-04 | 视联动力信息技术股份有限公司 | Data processing method and device |
| CN110417514B (en) * | 2019-07-22 | 2022-02-01 | 北京地平线机器人技术研发有限公司 | Data sending method and device and data receiving method and device |
| CN113986785A (en) * | 2021-11-03 | 2022-01-28 | 深圳市鑫鑫达电子有限公司 | USB data transmission based method |
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