CN1972455B - A fault-tolerant method of mobile multimedia broadcasting system - Google Patents
A fault-tolerant method of mobile multimedia broadcasting system Download PDFInfo
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- CN1972455B CN1972455B CN 200610157155 CN200610157155A CN1972455B CN 1972455 B CN1972455 B CN 1972455B CN 200610157155 CN200610157155 CN 200610157155 CN 200610157155 A CN200610157155 A CN 200610157155A CN 1972455 B CN1972455 B CN 1972455B
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- multimedia broadcast
- mobile multimedia
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Abstract
This invention relates to one mobile multi-media broadcast system err tolerant method, which comprises the following steps: a, mobile multi-media system sends complex frame key parameters; b, broadcasting terminal receives one err complex frame and using received key parameters to restore complex frame with shield err. This invention method sends key parameters and uses received complex key parameters for decoding when there is err in the complex frame.
Description
Technical field
The invention belongs to CMMB or technical field of mobile TV, specially refer to a kind of fault-tolerance approach that realizes mobile multimedia broadcast system.
Background technology
CMMB is a kind of Play Technique for Multimedia of rising in recent years.Through hand-held terminal, under the situation of high-speed mobile, can watch TV.The terminal receives programme through wireless protocols, and can select the channel of oneself having the right to watch, thereby can accept to select the multi-medium data of channel, is implemented in and sees TV on the portable terminal.
The audio, video data of CMMB all encapsulates by the mode of frame, uses frame length to indicate the size of the encapsulated frame of multi-medium data, thereby realizes the demarcation of multi-medium data encapsulated frame; If a part in the frame is made mistakes; Particularly some important data like length information, will lead to errors and in entire frame, spread; Cause in the frame data correctly not decode, with having a strong impact on watching of user.Mobile multimedia broadcast system transmits audio, video data through wireless channel or satellite channel, because the characteristic that this on-air radio transmits, the data of transmission receive various interference easily, cause transmission information to be made mistakes.And mobile multimedia broadcast system can't use common retransmission mechanism; Therefore should adopt certain method to come error correction in the mobile multimedia broadcast system; Reduce the error rate of transfer system, realize the good reception at terminal, let the user can experience the desirable effect of watching.
Summary of the invention
The object of the invention just is to provide a kind of fault-tolerance approach of mobile multimedia broadcast system, increases the error correcting capability of system, improves the fault-tolerant ability of multi-media broadcasting system, lets user experience better watch effect.
Technical scheme of the present invention is following:
A kind of fault-tolerance approach of mobile multimedia broadcast system may further comprise the steps:
(1) mobile multimedia broadcast system is carried the key parameter that former frame is sent multiplexed frame;
When (2) mobile multi-media broadcast terminal receives the multiplexed frame of an appearance mistake, utilize the key parameter that receives in advance to recover this multiplexed frame, the mistake that shielding occurs.
The key parameter of above-mentioned multiplexed frame comprises length, the multiplexed sub frame head length degree of multiplex frame head length, multiplexed sub frame.
Be the error code in the shielding transport process, the present invention also provides a kind of fault-tolerance approach of mobile multimedia broadcast system, may further comprise the steps:
(1) mobile multimedia broadcast system is carried the key parameter that former frame is sent multiplexed frame;
(2) multimedia broadcast channels make a mistake or this multiplexed frame in transport process when wrong, multi-media broadcast terminal uses the multiplexed frame key parameter that receives in advance, carries out demultiplexing and handles, the error code during shielding transmits;
The key parameter of above-mentioned multiplexed frame comprises length, the multiplexed sub frame head length degree of multiplex frame head length, multiplexed sub frame.
Method provided by the invention belongs to a kind of multi-medium data transmission error tolerance method that is adapted at using in the mobile media broadcasting network; Send the key parameter of multiplexed frame in advance; When mistake appearred in the multiplexed frame that receives when the terminal, the key parameter of the multiplexed frame that has received capable of using was decoded, thereby has strengthened the error correcting capability of system; Improved the fault-tolerant ability of multi-media broadcasting system, can let the better view reception effect of user experience.
Description of drawings
Shown in Figure 1 is the multiplexed frame structure.
Embodiment
Shown in Figure 1 is the multiplexed frame structure.In mobile multimedia broadcast system; A multiplexed frame is made up of multiplex frame head and a plurality of multiplexed sub frame; The important information such as length, subframe lengths that frame head is arranged in the multiplex frame head; Information such as multiplexed sub frame head length degree and multimedia audio-video data are arranged in the multiplex sub frame head, and promptly multimedia messages is encapsulated in the multiplexed sub frame.The wireless network transmissions of mobile multimedia broadcast system; Receive various interference easily, if important informations such as multiplex frame head length, multiplexed sub frame length are made mistakes in transmission course, diffusion will lead to errors; Influence the effect of rating; Therefore fault-tolerance approach of the present invention is at multiplex frame head these important informations to be taked safeguard measure, and multiplex frame head length, the length of multiplexed sub frame, the multiplexed sub frame head length degree of next frame is placed in this multiplexed frame transmission primaries in advance, and mobile multimedia broadcast system is to twice transmission of these important informations; Improve system survivability; The cost that improves fault-tolerant ability is to take multi-media broadcasting system more bandwidth resource, and meeting waste bandwidth under the respond well situation of mobile media broadcasting network wireless transmission also comprises the protection indication to this situation at multiplexed frame; Indicate and whether transmit the next frame key parameter and solve this problem, reach the purpose of practicing thrift the mobile multimedia broadcast system bandwidth.
If key parameter is interfered in the wireless transmission passage of multi-media broadcasting system and can't recovers; To cause multiplexed frame or multiplexed sub frame mistake to be delimited; The data that receive can't correctly be decoded; Influence the decoding effect of audio frequency and video, on video, can present mosaic phenomenon, noise is arranged in the audio frequency.For addressing this problem, these important informations are transmitted in carrying previous multiplexed frame.For example the key parameter of second multiplexed frame of multi-media broadcasting system transmission is placed in the multiplexed frame of first transmission and transmits, and indicates in the protection of using first multiplexed frame the key parameter that comprises second multiplexed frame in first multiplexed frame is described.
When the terminal of mobile multimedia broadcast system receives multiplexed frame, judge the key parameters such as length that whether comprise next frame in the multiplexed frame, in receiving buffering area, this information is carried out buffer memory, use when supplying next multiplexed frame to handle if just have according to the protection indication; When multimedia broadcast channels makes a mistake or the terminal of multi-media broadcasting system finds that this multiplexed frame is in transport process when wrong; The key parameters such as multiplexed frame length that use in time receives in advance carry out demultiplexing to be handled; Error code during shielding transmits, thus system survivability improved.
Claims (2)
1. the fault-tolerance approach of a mobile multimedia broadcast system may further comprise the steps:
(1) mobile multimedia broadcast system is carried the key parameter that former frame is sent multiplexed frame;
When (2) mobile multi-media broadcast terminal receives the multiplexed frame of an appearance mistake, utilize the key parameter that receives in advance to recover this multiplexed frame, the mistake that shielding occurs;
Wherein, the key parameter of said multiplexed frame comprises the length and the multiplexed sub frame head length degree of multiplex frame head length, multiplexed sub frame.
2. the fault-tolerance approach of a mobile multimedia broadcast system may further comprise the steps:
(1) mobile multimedia broadcast system is carried the key parameter that former frame is sent multiplexed frame;
(2) multimedia broadcast channels make a mistake or this multiplexed frame in transport process when wrong, multi-media broadcast terminal uses the multiplexed frame key parameter that receives in advance, carries out demultiplexing and handles, the error code during shielding transmits;
Wherein, the key parameter of said multiplexed frame comprises the length and the multiplexed sub frame head length degree of multiplex frame head length, multiplexed sub frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610157155 CN1972455B (en) | 2006-11-30 | 2006-11-30 | A fault-tolerant method of mobile multimedia broadcasting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610157155 CN1972455B (en) | 2006-11-30 | 2006-11-30 | A fault-tolerant method of mobile multimedia broadcasting system |
Publications (2)
| Publication Number | Publication Date |
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| CN1972455A CN1972455A (en) | 2007-05-30 |
| CN1972455B true CN1972455B (en) | 2012-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200610157155 Expired - Fee Related CN1972455B (en) | 2006-11-30 | 2006-11-30 | A fault-tolerant method of mobile multimedia broadcasting system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835051B (en) * | 2010-04-20 | 2012-02-01 | 杭州国芯科技股份有限公司 | Method for correcting mobile multimedia broadcasting multiplex frame head |
| CN105764147B (en) * | 2016-02-05 | 2019-11-08 | 北京佰才邦技术有限公司 | The acquisition methods and terminal of the length information of subframe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298580A (en) * | 1998-02-27 | 2001-06-06 | 西门子公司 | Common air interface for home telecommunications systems with wireless telecommunication based on code and time-multiplex |
| CN1458764A (en) * | 2003-05-30 | 2003-11-26 | 西安通视数据有限责任公司 | Forward error correcting method in one-way broadcast file transmission |
| CN1476692A (en) * | 2001-09-29 | 2004-02-18 | 连宇通信有限公司 | Error control method for mobile communication system |
| CN1622504A (en) * | 2003-11-26 | 2005-06-01 | 上海贝尔阿尔卡特股份有限公司 | A data packet recovery method |
-
2006
- 2006-11-30 CN CN 200610157155 patent/CN1972455B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298580A (en) * | 1998-02-27 | 2001-06-06 | 西门子公司 | Common air interface for home telecommunications systems with wireless telecommunication based on code and time-multiplex |
| CN1476692A (en) * | 2001-09-29 | 2004-02-18 | 连宇通信有限公司 | Error control method for mobile communication system |
| CN1458764A (en) * | 2003-05-30 | 2003-11-26 | 西安通视数据有限责任公司 | Forward error correcting method in one-way broadcast file transmission |
| CN1622504A (en) * | 2003-11-26 | 2005-06-01 | 上海贝尔阿尔卡特股份有限公司 | A data packet recovery method |
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| CN1972455A (en) | 2007-05-30 |
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