CN1960258A - Implementation method of downloading file in broadcasting network - Google Patents
Implementation method of downloading file in broadcasting network Download PDFInfo
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- CN1960258A CN1960258A CN 200610140259 CN200610140259A CN1960258A CN 1960258 A CN1960258 A CN 1960258A CN 200610140259 CN200610140259 CN 200610140259 CN 200610140259 A CN200610140259 A CN 200610140259A CN 1960258 A CN1960258 A CN 1960258A
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Abstract
The method includes the following steps. (1) Splits a document into several document blocks. Packs separately them into several data units; (2) Packs the several data units into a business channel and transfers them; each business channel relates to a multi-media broadcast channel. The business channel consists of the package head, the data section head and the mentioned several data units. The length of data unit is changeable. Each data unit without filling data consists of the data unit head, the data net load and the circulation correction. This invention adopts the length-changeable packing method. Features are: low overhead on the package head, flexible and efficient, error-compatibility mechanism and a strong ability of anti error-code.
Description
Technical field
The invention belongs to multimedia broadcasting or technical field of mobile TV, specially refer to a kind of method that realizes that file is downloaded in the multimedia broadcasting network.
Background technology
Mobile Multimedia Broadcasting is a kind of Play Technique for Multimedia of rising in recent years, by hand-held terminal, under the situation of high-speed mobile, can watch TV.Terminal receives programme by 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 aerial data of system emission are divided into different channels, and the data of each channel comprise again: three types of video, audio frequency and data, terminal can receive relevant data, by the player on the terminal, realizes the normal play of TV.
Data are used for realizing application such as captions, file download, IP multicast, ESG (electronic program guides) download, and are an important supplement to the video-voice frequency flow of real-time broadcast in radio network.ESG can regard a file as, is a special case of file downloading service.
In radio network, the method for packing that existing file is downloaded has 2 kinds:
The first, TS (transport stream) mode, TS agreement are a kind of in MPEG (Motion Picture Experts Group) standard, after it cuts into the fritter data to a file, are placed in the bag of fixing 188 byte-sized and transmit.
The second, IP (Internet protocol) multicast mode, file cut into the fritter data after, be placed in the IP multicast packets, the size of bag is fixing, distinguishes different classs of business by the IP address with the IP port numbers.
Said method respectively has the strengths and weaknesses.First method, because the size of TS bag is fixed, one piece of data is in the intermediate transport of a plurality of TS bag, last TS bag often can not use up fully, have a large amount of filling informations, so the efficiency of transmission of TS mode is lower; Second method, because there are 28 bytes in the packet header of IP multicast, expense is also bigger.
Summary of the invention
The purpose of this invention is to provide a kind of method that file is downloaded in multi-media broadcasting system, make and to utilize multimedia broadcasting network to realize that file and ESG download.
The present invention realizes by the following technical solutions:
Realize the method that file is downloaded in a kind of radio network, may further comprise the steps:
(1) file division is become a plurality of blocks of files, be encapsulated in respectively in a plurality of data cells;
(2) described a plurality of data cells are encapsulated in the service channel transmit, the corresponding multimedia broadcasting (DMB) channels of a described service channel.
Wherein, described file comprises 1 data unit description bag, 1 data unit end packet.According to the size of file, can also comprise at least one data cell tundish.
The length of described data cell is unfixing, is elongated; Each data cell comprises data unit header, payload user data, cyclic check, and data unit header wherein comprises data cell type, data cell extension header.
Comprise packet header, data segment header and described a plurality of data cell in the described service channel, wherein, write down the length of packet header length, video data segment length, voice data segment length, data segment in the described packet header, write down sum, the length of each data cell, the CRC of data cell in the described data segment header.
Method of the present invention is to broadcast in a channel by package file, has realized functions such as file download, ESG download.The invention belongs to the method for packing that a kind of file of being adapted at using in the radio network is downloaded, is a kind of elongated method for packing, and the packet header expense is very little, the flexibility ratio height, and efficient will be far above method of the prior art, and fault tolerant mechanism is arranged, and anti-error code capacity is strong.
Description of drawings
Fig. 1 is the schematic diagram that file transmits in service channel
Fig. 2 is the method schematic diagram that file splits in radio network
Embodiment
The method that realization file of the present invention is downloaded is that a file division is become a plurality of fritters, is encapsulated in a plurality of data cells, a plurality of data cells is encapsulated in the service channel transmits.The corresponding channel of service channel, a channel sends 1 secondary data in a Fixed Time Interval, and Fixed Time Interval can be 1 second, also can be the other times value.
Fig. 1 is the schematic diagram that method file of the present invention transmits in service channel.If 1 service channel is to be used for realizing the file download function, then there are not video data, voice data in this service channel, only comprise packet header, data segment header, a N data unit.
Mainly be some control informations in the packet header, packet header mainly comprises: the length of packet header length, video data segment length, voice data segment length, data segment, CRC (cyclic check code) etc.
Data segment header comprises: the sum of data cell, the length of each data cell, CRC etc.
Data cell is made up of data unit header, payload user data, CRC, and wherein data unit header comprises that the expansion of data cell type, data cell is first-class.
Fig. 2 is the method schematic diagram that file splits in radio network.A file is made up of 1 data unit description bag, a plurality of data cell tundish, 1 data unit end packet.A file is placed in a plurality of data cells after being cut apart.It is the initial bag of a file that data cell is described bag, is essential, has comprised a description information of files, for the terminal that just begins to accept data, must receive after data cell describes bag, could really begin to receive file.The data cell tundish is optionally, for very little file, can not have the data cell tundish.The data cell end packet is essential, represents an end of file to finish.
Service channel sends 1 secondary data at set intervals, comprises one or more data cells, finishes transmission up to a file.
Data cell is described bag and has been write down description information of files, and terminal can be utilized these descriptor composition files.
Each data cell is elongated, does not have padding data, therefore contrasts the TS method for packing, improves the utilance of transfer of data.CRC (cyclic check code) is in order to prevent error code, to improve reliability.
Utilize said method, can encapsulate a file, also can encapsulate ESG (electronic program guides), can realize colourful data service.
Below by an example the present invention is described further.In this example, service channel has the speed of 64Kbit/s.
The total length of this channel is 8192 bytes, wherein: long 18 bytes in packet header; Data segment head length 10 bytes, data cell have 2, and data unit header length is 1 byte, and the CRC of data cell is 4 bytes, and the total length of payload user data is 8154 bytes, and transmission efficiency reaches 99.5%.
For the file of 1 2M, can in the time of clock more than 4 minutes, transmit and finish.
If transmit ESG, consider that the data volume of 1 complete ESG has the 80K byte, adopt the service channel of 1 64Kbit/s, can finish transmission in 10 seconds.
Claims (10)
1. realize the method that file is downloaded in a radio network, may further comprise the steps:
(1) file division is become a plurality of blocks of files, be encapsulated in respectively in a plurality of data cells;
(2) a plurality of data cells are encapsulated in the service channel transmit, the corresponding multimedia broadcasting (DMB) channels of a described service channel.
2. the method for claim 1 is characterized in that: the described file of step (1) comprises that 1 data unit describes bag, 1 data unit end packet.
3. method as claimed in claim 2 is characterized in that: it is the initial bag of a file that described data cell is described bag, has write down a description information of files; Described data cell end packet is represented the end of a file.
4. the method for claim 1, it is characterized in that: the described file of step (1) also comprises at least one data cell tundish.
5. the method for claim 1 is characterized in that: the length of described data cell is fixing.
6. the method for claim 1, it is characterized in that: described data cell comprises data unit header, payload user data, cyclic check code.
7. method as claimed in claim 6 is characterized in that: described data unit header comprises data cell type, data cell extension header.
8. the method for claim 1 is characterized in that: comprise packet header, data segment header and described a plurality of data cell in the described service channel of step (2).
9. method as claimed in claim 8 is characterized in that: write down packet header length, video data segment length, voice data segment length, the length of data segment, cyclic check code in the described packet header.
10. method as claimed in claim 8 is characterized in that: the sum, the length of each data cell, the cyclic check code that have write down data cell in the described data segment header.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101402591A CN100512121C (en) | 2006-10-20 | 2006-10-20 | Method for realizing file downloading in broadcasting network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101402591A CN100512121C (en) | 2006-10-20 | 2006-10-20 | Method for realizing file downloading in broadcasting network |
Publications (2)
| Publication Number | Publication Date |
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| CN1960258A true CN1960258A (en) | 2007-05-09 |
| CN100512121C CN100512121C (en) | 2009-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101402591A Expired - Fee Related CN100512121C (en) | 2006-10-20 | 2006-10-20 | Method for realizing file downloading in broadcasting network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110961B (en) * | 2007-08-03 | 2010-06-16 | 北京创毅视讯科技有限公司 | Multimedia broadcast data transmission method, device and system |
| CN102137122A (en) * | 2010-01-22 | 2011-07-27 | 北京金山数字娱乐科技有限公司 | Method and device for downloading data |
| CN101409866B (en) * | 2007-10-12 | 2012-12-19 | 华为技术有限公司 | Method, system and apparatus for obtaining complement electronic business guide data |
-
2006
- 2006-10-20 CN CNB2006101402591A patent/CN100512121C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110961B (en) * | 2007-08-03 | 2010-06-16 | 北京创毅视讯科技有限公司 | Multimedia broadcast data transmission method, device and system |
| CN101409866B (en) * | 2007-10-12 | 2012-12-19 | 华为技术有限公司 | Method, system and apparatus for obtaining complement electronic business guide data |
| CN102137122A (en) * | 2010-01-22 | 2011-07-27 | 北京金山数字娱乐科技有限公司 | Method and device for downloading data |
| WO2011088710A1 (en) * | 2010-01-22 | 2011-07-28 | 北京金山软件有限公司 | Method and device for downloading data |
| CN102137122B (en) * | 2010-01-22 | 2014-08-20 | 广州华多网络科技有限公司 | Method and device for downloading data |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100512121C (en) | 2009-07-08 |
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Granted publication date: 20090708 Termination date: 20171020 |