CN102142921A - Code stream structure and method for transmitting data - Google Patents
Code stream structure and method for transmitting data Download PDFInfo
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- CN102142921A CN102142921A CN2010101034384A CN201010103438A CN102142921A CN 102142921 A CN102142921 A CN 102142921A CN 2010101034384 A CN2010101034384 A CN 2010101034384A CN 201010103438 A CN201010103438 A CN 201010103438A CN 102142921 A CN102142921 A CN 102142921A
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Abstract
The invention provides a code stream structure and a method for transmitting data, relating to the field of data communication. When a transmitting end is multiplexed to generate a multiplex protocol data unit (MUM-PDU), data adds a supplemented field on the tail of the MUM-PDU; and the supplemented field is multiple copies of the head of the MUM-PDU for improving the gain of the head of the MUM-PDU. When a receiving end receives the MUM-PDU, the head of the MUM-PDU is subjected to cyclic redundancy check (CRC) verification; if the MUM-PDU has an error code, the supplemented field is continuously verified; the MUM-PDU is kept only when the head of one MUM-PDU in the supplemented field is correct after CRC verification; and thus, MUM-PDU loss probability is lowered so as to reduce the possibility of losing data.
Description
Technical field
The present invention relates to data communication technology field, relate in particular to the code flow structure and the transmission method thereof of the low transfer of data of code check wireless channel terminal under the high bit-error environment.
Background technology
H.324/M international standard can be used in the service of wireless circuit switched network support real-time multimedia.The sub-protocol standard that this standard comprises is: voice, video, user data and control data multiplexed with separate (H.223) etc.
Third generation affiliate (3rd Generat ion Partnership Project, be 3GPP) adopt a standard of H.324/M advising as 3G network conventional video phone, be named as 3G-324M by its suggestion of adopting, the 3G-324M terminal is the real-time Transmission equipment of the video, audio frequency and the data that are applied to circuit-switched network, but ask for something has been proposed at speech, video and multiplex operation, H.263, specifying as: 3G-324M terminal is basic standard as forcing video coding, and MPEG-4 as the video coding proposed standard; Specify AMR as forcing audio coding standard, and G.732.1 as the audio coding proposed standard; H.223 accessories B is used for protecting multiplex data.
Video and voice data handle and the principle of transmission as shown in Figure 1: video input apparatus and audio input device inputting video data and voice data are to the 3G324M protocol stack, encode by wherein H.263 codec and AMR codec, carry out adaptive and multiplexing through protocol stack H.223, and, send by the 3G channel by after H.245 protocol stack adds relevant indication information.Wherein, according to 3G-324M agreement regulation, the CS64K Channel Transmission is adopted in the suggestion of 3G channel.The reception of reverse data and processing are opposite with top process.
The transmission method of data comprises in the prior art:
Step 1: transmitting terminal is encoded to data;
Step 2: the data multiplex after transmitting terminal will be encoded generates MUX-PDU (multiplex protocol data units, Multiplex Protocol Data Unit), described MUX-PDU comprises MUX-PDU head and MUX-PDU load, in multiplexing generation MUX-PDU, identify in the head front of MUX-PDU loading synchronous;
Step 3: transmitting terminal sends to receiving terminal by the 3G channel with data;
Step 4: receiving terminal receives the MUX-PDU data, and the search sync id is carried out CRC (cyclic redundancy code) verification to the MUX-PDU head, if there is not error code, then obtains MUX-PDU; If error code is arranged, then abandon this MUX-PDU.
In said process, MUX-PDU is the minimum transmission units of transfer of data, under wireless network environment, error code may appear in low code check channel transmission data, if the MUX-PDU head produces error code because of transmission, then receiving terminal causes MUX-PDU to lose the failure of MUX-PDU head CRC check thereby can't take out a MUX-PDU according to the MUX-PDU head.If unfixed mosaic of large tracts of land or grey piece then can appear in video data, if speech data then choppy voice can occur, these all are that user institute is unacceptable.
Summary of the invention
The code flow structure and the method that the purpose of this invention is to provide a kind of transfer of data, the MUX-PDU head produces error code in the prior art in transmission course to overcome, and causes receiving terminal to take out the phenomenon that a MUX-PDU loses the MUX-PDU data according to the head of MUX-PDU.
The present invention solves above-mentioned technical problem by such technical scheme:
A kind of code flow structure of transfer of data, the code flow structure of described transfer of data comprises sync id and MUX-PDU, MUX-PDU is made up of MUX-PDU head and MUX-PDU load, wherein, the code flow structure of described transfer of data also comprises supplemental field, and described supplemental field has comprised at least one copy of corresponding MUX-PDU head.
As a further improvement on the present invention, described supplemental field is corresponding with MUX-PDU and be carried in the afterbody of corresponding MUX-PDU.
As a further improvement on the present invention, described supplemental field is carried in MUX-PDU load back.
The present invention also provides a kind of transmission method of code flow structure, and described transmission method repeats to transmit the MUX-PDU head in transmission MUX-PDU.
As a further improvement on the present invention, described transmission method transmits data at transmitting terminal and receiving terminal, comprising:
Step 1: transmitting terminal is encoded to data, and the data multiplex after will encoding generates MUX-PDU, in multiplexing generation MUX-PDU, identify in MUX-PDU head front loading synchronous, load supplemental field in MUX-PDU load back, and sending to receiving terminal, described supplemental field has comprised at least one copy of corresponding MUX-PDU head;
Step 2: receiving terminal receives MUX-PDU, and the search sync id is carried out cyclic redundancy check to the MUX-PDU head, if do not have error code then obtain MUX-PDU, if error code is arranged then execution in step three;
Step 3: obtain supplemental field, supplemental field is carried out cyclic redundancy check,, then, obtain MUX-PDU combining with MUX-PDU load through the correct MUX-PDU head of verification if having one through the correct MUX-PDU head of cyclic redundancy check.
As a further improvement on the present invention, in the described step 3,, then abandon MUX-PDU if do not find to exist one through the correct MUX-PDU head of cyclic redundancy check in supplemental field.
Compared with prior art, the present invention is adding supplemental field by the afterbody at MUX-PDU, be used to improve the gain of MUX-PDU head, effectively avoided because of the MUX-PDU head produces error code in transmission course, caused receiving terminal to take out the phenomenon that a MUX-PDU loses the MUX-PDU data according to the head of MUX-PDU.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below.
Fig. 1 is the principle schematic of data processing and transmission in the prior art;
Fig. 2 is the code flow structure schematic diagram of transfer of data of the present invention;
Fig. 3 is the schematic flow sheet of data transmission method of the present invention;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described.
See also Fig. 2, the code flow structure of transfer of data provided by the invention comprises sync id, MUX-PDU (multiplex protocol data units, Multiplex Protocol Data Unit) head, MUX-PDU load and supplemental field (Enhance Part).Wherein, supplemental field is added on the afterbody of MUX-PDU, promptly is added on MUX-PDU load back.Described supplemental field comprises the copy of a plurality of MUX-PDU heads, can be used for improving the gain of MUX-PDU head.By increasing supplemental field, repeat to transmit the MUX-PDU head, reach the purpose that significant data repeats to transmit, reduce the losing probability of MUX-PDU in transmission course.
Transmitting terminal is encoded to data, and, in multiplexing generation MUX-PDU, identify in MUX-PDU head front loading synchronous with the multiplexing generation of coded data MUX-PDU, load supplemental field in MUX-PDU load back, wherein supplemental field comprises a plurality of and a plurality of copies MUX-PDU head.
Transmitting terminal sends to receiving terminal by the 3G channel with the MUX-PDU of multiplexing generation.
Receiving terminal receives the MUX-PDU data, and the MUX-PDU head is carried out CRC (CRC) verification, if there is not error code, then obtains MUX-PDU; If error code is arranged, then continue to obtain the supplemental field of MUX-PDU, if find to exist one through the correct MUX-PDU head of CRC check, then, obtain MUX-PDU combining with current MUX-PDU load through the correct MUX-PDU head of verification in supplemental field; If do not find to exist one through the correct MUX-PDU head of CRC check in supplemental field, then abandon this MUX-PDU.
See also Fig. 3, the also corresponding transmission method that a kind of data are provided of the present invention, described method comprises the steps:
Step 301: transmitting terminal is encoded to data;
Step 302: the data multiplex after transmitting terminal will be encoded generates MUX-PDU (multiplex protocol data units, Multiplex Protocol Data Unit), described MUX-PDU comprises the MUX-PDU head, MUX-PDU load, in multiplexing generation MUX-PDU, in MUX-PDU head front loading synchronous sign, load supplemental field in MUX-PDU load back, and send to receiving terminal by the 3G channel;
Step 303: receiving terminal receives the MUX-PDU data, and the search sync id is carried out CRC check to the MUX-PDU head, if do not have error code then execution in step 305, if error code is arranged then execution in step 304:
Step 304: continue to obtain the MUX-PDU supplemental field, supplemental field is carried out CRC check, if find to exist one through the correct MUX-PDU head of CRC check in supplemental field, then execution in step 306, if do not find to exist one through the correct MUX-PDU head of CRC check in supplemental field, then execution in step 306;
Step 305:, obtain MUX-PDU combining with MUX-PDU load through the correct MUX-PDU head of verification;
Step 306: abandon MUX-PDU;
The present invention adds a supplemental field at the MUX-PDU afterbody when the multiplexing generation of transmitting terminal MUX-PDU, this supplemental field has comprised a plurality of MUX-PDU heads that duplicate, the gain that is used to improve the MUX-PDU head.Receiving terminal is when receiving MUX-PDU, the MUX-PDU head is carried out CRC check, there is error code if find the MUX-PDU head, then can continue the verification supplemental field, as long as it is correct through the CRC check that a MUX-PDU head is arranged in the supplemental field,, thereby obtain MUX-PDU then combining with MUX-PDU load through the correct MUX-PDU head of verification, that just can reduce the probability that MUX-PDU loses, thereby has also reduced losing of data.
More than by embodiment the present invention is had been described in detail, but these are not to be construed as limiting the invention.Protection scope of the present invention is not exceeded with above-mentioned execution mode, as long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection range that note is planted in claims.
Claims (8)
1. the code flow structure of a transfer of data, the code flow structure of described transfer of data comprises sync id and MUX-PDU, MUX-PDU is made up of MUX-PDU head and MUX-PDU load, it is characterized in that: the code flow structure of described transfer of data also comprises supplemental field, and described supplemental field has comprised at least one copy of corresponding MUX-PDU head.
2. the code flow structure of transfer of data as claimed in claim 1 is characterized in that: described supplemental field is corresponding one by one with MUX-PDU and be carried in the afterbody of corresponding MUX-PDU.
3. the code flow structure of transfer of data as claimed in claim 2, it is characterized in that: described supplemental field is carried in MUX-PDU load back.
4. a data transmission method that adopts code flow structure as claimed in claim 1 is characterized in that, described transmission method repeats to transmit the MUX-PDU head in transmission MUX-PDU.
5. data transmission method as claimed in claim 4 is characterized in that, described transmission method transmits data at transmitting terminal and receiving terminal, comprising:
Step 1: transmitting terminal is encoded to data, and the data multiplex after will encoding generates MUX-PDU, in multiplexing generation MUX-PDU, identify in MUX-PDU head front loading synchronous, load supplemental field in MUX-PDU load back, and sending to receiving terminal, described supplemental field has comprised at least one copy of corresponding MUX-PDU head;
Step 2: receiving terminal receives MUX-PDU, and the search sync id is carried out cyclic redundancy check to the MUX-PDU head, if do not have error code then obtain MUX-PDU, if error code is arranged then execution in step three;
Step 3: obtain supplemental field, supplemental field is carried out cyclic redundancy check,, then, obtain MUX-PDU combining with current MUX-PDU load through the correct MUX-PDU head of verification if having one through the correct MUX-PDU head of cyclic redundancy check.
6. data transmission method as claimed in claim 5 is characterized in that, in the described step 3, if do not find to exist one through the correct MUX-PDU head of cyclic redundancy check in supplemental field, then abandons MUX-PDU.
7. data transmission method as claimed in claim 5 is characterized in that, described supplemental field is corresponding with MUX-PDU and be carried in the afterbody of corresponding MUX-PDU.
8. data transmission method as claimed in claim 7 is characterized in that, described supplemental field is carried in MUX-PDU load back.
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| CN201010103438.4A CN102142921B (en) | 2010-01-29 | 2010-01-29 | Code stream structure and method for transmitting data |
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| CN201010103438.4A CN102142921B (en) | 2010-01-29 | 2010-01-29 | Code stream structure and method for transmitting data |
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| CN1602616A (en) * | 2002-08-09 | 2005-03-30 | 松下电器产业株式会社 | Header compression/decompression device and header compression/decompression method |
| CN1852290A (en) * | 2005-08-12 | 2006-10-25 | 上海华为技术有限公司 | Method for generating transmission data block |
| CN101057501A (en) * | 2004-09-22 | 2007-10-17 | 高通股份有限公司 | Video demultiplexer and decoder with efficient data recovery |
| CN101094399A (en) * | 1996-09-02 | 2007-12-26 | 株式会社东芝 | Encoding/decoding apparatus and encoding-multiplexing/decoding-demultiplexing apparatus |
| CN101557241A (en) * | 2008-04-07 | 2009-10-14 | 联发科技股份有限公司 | Method and apparatus for performing protocol data unit header re-synchronization in communication system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101094399A (en) * | 1996-09-02 | 2007-12-26 | 株式会社东芝 | Encoding/decoding apparatus and encoding-multiplexing/decoding-demultiplexing apparatus |
| CN1602616A (en) * | 2002-08-09 | 2005-03-30 | 松下电器产业株式会社 | Header compression/decompression device and header compression/decompression method |
| CN101057501A (en) * | 2004-09-22 | 2007-10-17 | 高通股份有限公司 | Video demultiplexer and decoder with efficient data recovery |
| CN1852290A (en) * | 2005-08-12 | 2006-10-25 | 上海华为技术有限公司 | Method for generating transmission data block |
| CN101557241A (en) * | 2008-04-07 | 2009-10-14 | 联发科技股份有限公司 | Method and apparatus for performing protocol data unit header re-synchronization in communication system |
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Application publication date: 20110803 Assignee: Shanghai Li Ke Semiconductor Technology Co., Ltd. Assignor: Leadcore Technology Co., Ltd. Contract record no.: 2018990000159 Denomination of invention: Code stream structure and method for transmitting data Granted publication date: 20150325 License type: Common License Record date: 20180615 |