CN1976477B - Mobile multi-media broadcasting data transmitting method - Google Patents
Mobile multi-media broadcasting data transmitting method Download PDFInfo
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- CN1976477B CN1976477B CN2006101611883A CN200610161188A CN1976477B CN 1976477 B CN1976477 B CN 1976477B CN 2006101611883 A CN2006101611883 A CN 2006101611883A CN 200610161188 A CN200610161188 A CN 200610161188A CN 1976477 B CN1976477 B CN 1976477B
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Abstract
A method for transmitting mobile multimedia broadcast data includes dividing each multiplexing sub-frame of mobile multimedia broadcast multiplexing frame to be multiplexing sub-frame head with fixed length and multiplexing sub-frame data body with variable length, confirming type of multimedia broadcast data to be transmitted and relevant concrete data, recording type information of data to be transmitted in multiplexing sub-frame head and transmitting said relevant concrete data by packaging said relevant concrete data in multiplexing sub-frame data body.
Description
Technical field
The present invention relates to the communications field, particularly the transmission method of multimedia broadcast data in the filed of mobile multimedia broadcasting.
Background technology
Mobile multi-media broadcasting service (being mobile TV again) has multiple realization technology, multimedia broadcast multicast (MBMS based on mobile communications network is arranged, Multimedia Broadcast MulticastService), broadcasting and multicast (BCMCS, Broadcast and Multicast Service), stream media technology, also have based on radio network (received terrestrial digital broadcasting, satellite digital broadcasting) technology, for example (the digital video broadcast-handheld formula receives Ou Zhou DVB-H: Digital Video BroadcastHandheld), Media Forward LinkOnly) and the CMMB of China (China Mobile multimedia broadcasting: China Mobile MultimediaBroadcast) etc., also have the application layer ancillary technique MediaFLO of the U.S. (the single forward link of medium:.Mobile multi-media service based on radio network has advantages such as availability of frequency spectrum height, capacity is big, construction cost is relatively low, the audient is wide, is used widely.
Compare with analogue technique, a great advantage of digital mobile multimedia broadcasting technology is exactly: under the prerequisite that satisfies professional quality of service requirement, a broadcast channel can improve the utilization ratio of Radio Resource so greatly by the multiplexing transmission of supporting a plurality of business.Multiplex system is one of key technology part of Digital Television, it is with data flow such as video, audio frequency, auxiliary data, electron service instruction, condition reception, system's controls, the treated bit stream that is combined into the single channel serial, again distribute, multiplexing, launch by broadcast channel, terminal receives these relevant data, by the player on the terminal, realizes the normal play of multi-media broadcasting service.This data encapsulation packing of multiplex system will make DMB possess the basis of extensibility, graded properties, interactivity.
The digital mobile multimedia service data has multiple multiplexing method, and main multiplexing method has now:
First, TS (transport stream) mode, the TS agreement is a kind of in MPEG (Motion Picture Experts Group) standard, it transmits video, audio frequency, auxiliary data or the like data encapsulation in a TS bag of fixing 188 byte-sized, the reproduction time that has comprised each data block in the TS bag is to guarantee the normal play of video/audio.
The second, RTP (RTP) mode is the method that transmits auxiliary data, video, voice data in IP network, and the size of bag is fixing, and the time stamp by each packet header guarantees the time synchronized play, guarantees the broadcast order that wraps by sequence number.
Above-mentioned TS mode is put on an equal footing multi-medium data and control information, and the data encapsulation form of the unified fixed length of employing, this mode efficiency of transmission is not high, to system core poor information safeguard measure, do not consider the particularity of mobile communication system, become during such as wireless fading channel, there are a large amount of characteristics such as uncertainty in communication process; And the RTP mode can only be used on IP network, has certain limitation.
Summary of the invention
The object of the present invention is to provide a kind of transmission method of mobile multi-media broadcasting data, can be applicable to multimedia broadcasting network, and can reduce transport overhead, improve the efficiency of transmission and the performance of system.
For achieving the above object, the invention provides a kind of transmission method of mobile multi-media broadcasting data, may further comprise the steps:
(1) each multiplexed sub frame with the mobile multimedia broadcasting multiplex frame is divided into multiplexed sub frame head and multiplexed sub frame data volume, and wherein, the length of described multiplexed sub frame head is fixed, and the length of multiplexed sub frame data volume is variable;
(2) classification of definite multimedia broadcast data that will transmit, and corresponding concrete data;
(3) classification information of the data that will transmit is recorded in the described multiplexed sub frame head, and corresponding concrete data encapsulation is transmitted in the multiplexed sub frame data volume.
In the described step (3), in the multiplexed sub frame head, during the recorded information classification,, be used to write down the priority of the packaged data of subsequent reuse sub-frame data body with described multiplexed sub frame head reserved part length position.
Above-mentioned data category comprises system data and business datum.Described system data can be that electron service instruction data or condition receive data; Described business datum can be to flow business datum in real time, or the file downloading service data, or the IP multicast service data.
Method of the present invention is according to multiplexed sub frame loaded service type difference, define the encapsulation format of the business of being transmitted respectively, adopt elongated method for packing, existing relatively fixed length method for packing, saved transport overhead, thereby improved the efficiency of transmission of system, and saved the broadcast bandwidth resource, increased the flexibility and the extensibility of system simultaneously.
Description of drawings
Fig. 1 is the structural representation of broadcasting multiplex frame of the present invention;
Fig. 2 is the structural representation of multiplexed sub frame of the present invention;
Fig. 3 is the schematic diagram of an embodiment of multiplexed sub frame data volume encapsulation of the present invention.
Embodiment
In Mobile Multimedia Broadcasting (CMMB) system, multimedia broadcasting is divided into a plurality of passages by time division multiplexing, and each passage has fixing transmission rate.At the characteristics of mobile multi-media broadcasting service, the transmission mechanism that adopts loaded service information to separate with control information.The system core control information transmits in control channel, and multimedia service and part system data transmit at service channel.These passages are described with multiplexed frame, and multiplexed frame is made up of multiplex frame head, multiplexing payload and filling, and concrete multimedia service data and the system data of multiplexing payload carrying is made up of one or more multiplexed sub frames.
Method of the present invention is in Mobile Multimedia Broadcasting, each multiplexed sub frame of forming multiplexed frame to be divided into multiplexed sub frame head and multiplexed sub frame data volume; Wherein, the multiplexed sub frame head is a regular length, and the length of multiplexed sub frame data volume is variable.
Wherein, the multiplexed sub frame head is used for the data category of recording carrying, is system data or business datum such as what describe carrying.System data can be that electron service instruction data, condition receive data etc.; Business datum can be to flow business datum, file downloading service data, IP multicast service data etc. in real time.
In the fixed-length data position of multiplexed sub frame head, describe the data carried by data classification except that utilizing a part of data bit, but reserved part bit length also, the priority level of subsequent reuse sub-frame data body institute bearer service is described, be convenient to system and terminal and carry out particular processing, be convenient to carrying out of broadcast operator business.
The multiplexed sub frame data volume is elongated structures according to the different encapsulation format of distinguishing definition of data of data carried by data classification.
Below in conjunction with accompanying drawing method of the present invention is further specified.
Fig. 1 is the structural representation of mobile multimedia broadcasting multiplex frame of the present invention.In Mobile Multimedia Broadcasting (CMMB) system, multimedia broadcasting is by time division multiplexing, be divided into a plurality of passages, each passage has fixing transmission rate, these passages are described with multiplexed frame, multiplexed frame is made up of multiplex frame head, multiplexing payload and filling, and multiplexing payload is made up of one or more multiplexed sub frames again, carries concrete business datum and system data.
Fig. 2 is the structural representation of multiplexed sub frame of the present invention, and the present invention is divided into subframe head and sub-frame data body with multiplexed sub frame, and the multiplexed sub frame head is defined as regular length, and the multiplexed sub frame data volume is defined as elongated structure.
The classification of the multi-medium data of carrying is described in the multiplexed sub frame head, as, be business datum or system data.Wherein business datum can be real-time media stream business, downloading service, IP multicast service data etc., and system data can be that electron service instruction (ESG) data, condition receive (CA) data etc.
In the embodiment shown in Figure 2, the multiplexed sub frame head is defined as 8 length-fixed structures, wherein preceding 5 are defined as data category, leave system's reservation use for for back 3, such as being preserved for defining professional priority level.
The data category of multiplexed sub frame head is used to identify the entrained data category of back multiplexed sub frame data volume.Distribute a different identification number value to represent can for each data category, in present embodiment, give the apportioning cost such as the following table 1 of data category identification number:
The distribution of table 1 data category identification number value
| Value | Data type |
| 0 | Keep |
| 1 | Electron service instruction data |
| 2 | Condition receives data |
| 3 | The real-time media stream business datum |
| 4 | The file downloading service data |
| 5 | The IP multicast service data |
| 6～31 | Keep |
The multiplexed sub frame data volume is used to encapsulate system data or the multimedia service data that the subframe head of this multiplexed sub frame is described.The multiplexed sub frame data volume is elongated, according to different data types, defines different encapsulation format and encapsulates, thereby can improve the utilance of transfer of data.
Fig. 3 is the schematic diagram of an embodiment of multiplexed sub frame data volume encapsulation of the present invention, and present embodiment is that electron service instruction (ESG) is an example with data carried by data, further specifies the method for packing of multiplexed sub frame data volume.
Referring to table 1, when multiplexed sub frame head data category ident value was ' 1 ', what expression multiplexed sub frame data volume carried was the ESG data.
See Fig. 3, the present invention is divided into ESG head, ESG payload user data and CRC (data check) with ESG, is encapsulated in the multiplexed sub frame data volume.
ESG head has wherein comprised the information of describing this sub-frame data body, is convenient to front end relevant device (being generally multiplexing equipment), terminal equipment processing, specifically comprises following information:
(1) table sign: be used to distinguish different ESG tables, identify with the table sequence number, the definition example of ESG table sequence number is shown in Table 2.
Table 2ESG table sequence number definition example
| Value | The table type |
| 0 1 2 3 4 5 ... | The professional extend information table of retained business table contents table layout table service parameter table |
(2) version number: which time of ESG form of representing this transmission upgraded, the value that in certain value scope, circulates, and each the renewal adds ' 1 ';
(3) data compression algorithm type: representative is to the type of the compression algorithm of ESG payload user data use, and the definition example sees Table 3; Terminal adopts corresponding algorithm to ESG data decode/decompression according to this value.
The definition of table 3 compression algorithm type
| Value | Implication |
| 0 1 2 | Do not compress the binary-coded XML of Gzip compression algorithm |
| ... | Other compression algorithm |
(4) ESG payload user data type: indication ESG payload user data be the ESG model such as XMLSchema, or ESG data;
(5) keep: reserve expansion in the future and use;
(6) joint sequence number: which data section the ESG form of current transmission is.
(7) total joint number: the total data joint number order of this data form.
ESG payload user data wherein, if ESG head indication compression algorithm type is ' 0 ' (promptly not compressing), then the ESG payload user data is whole is ESG table initial data, otherwise is the ESG data volume after the compression.
More than being to be that ESG for example understands the encapsulation of data carried by data at multiplexed sub frame with the data carried by data, is that the characteristics according to ESG have defined specific encapsulation format.Because multiplexed sub frame data volume of the present invention is elongated, to the encapsulation of other mobile multi-media service data or system data at multiplexed sub frame, can define different encapsulation format as required, therefore can reduce transport overhead, improve the efficiency of transmission and the performance of system.
Claims (6)
1. the transmission method of a mobile multi-media broadcasting data may further comprise the steps:
(1) each multiplexed sub frame with the mobile multimedia broadcasting multiplex frame is divided into multiplexed sub frame head and multiplexed sub frame data volume, wherein, described multiplexed sub frame head is made of data category that is used for recording carrying and reservation position, the length of multiplexed sub frame head is fixed, the length of multiplexed sub frame data volume is variable, writes down the priority of the data that encapsulate in the subsequent reuse sub-frame data body with keeping the position in the multiplexed sub frame head;
(2) the definite multimedia broadcast data classification that will transmit, and corresponding concrete data;
(3) the data category information that will transmit is recorded in the described multiplexed sub frame head, and according to the different different encapsulation format of data category definition corresponding concrete data encapsulation is transmitted in the multiplexed sub frame data volume.
2. the method for claim 1 is characterized in that: in the described step (3), keep the partial-length position of described multiplexed sub frame head.
3. the method for claim 1, it is characterized in that: described data category comprises system data and business datum.
4. method as claimed in claim 3 is characterized in that: described system data is that electron service instruction data or condition receive data; Described business datum is to flow business datum in real time, or the file downloading service data, or the IP multicast service data.
5. the method for claim 1 is characterized in that: adopt time division multiplexing mode that multimedia broadcasting is divided into a plurality of passages, each passage has fixing transmission rate, is used to transmit the multiplexed frame of described multimedia broadcasting.
6. the method for claim 1 is characterized in that: described mobile multimedia broadcasting multiplex frame is by multiplex frame head, multiplexing payload and fill and form; Described multiplexing payload is made up of one or more multiplexed sub frames.
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| CN2006101611883A CN1976477B (en) | 2006-12-11 | 2006-12-11 | Mobile multi-media broadcasting data transmitting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101325480B (en) * | 2007-06-13 | 2012-05-23 | 中兴通讯股份有限公司 | Scrambling control method and device based on multiplexing subframe |
| CN101426005B (en) * | 2007-10-29 | 2012-06-13 | 中兴通讯股份有限公司 | IP data packet packaging, sending and receiving method for wireless broadcast system |
| CN101453347B (en) * | 2007-11-30 | 2011-01-05 | 中兴通讯股份有限公司 | Mobile multimedia broadcast data sending and receiving method |
| CN101184249B (en) * | 2007-12-21 | 2010-11-24 | 中兴通讯股份有限公司 | On-line test system and method for mobile multimedia broadcasting system |
| CN101369855B (en) * | 2008-09-25 | 2010-09-29 | 中兴通讯股份有限公司 | Emergency broadcast transmission method and system, and receiving terminal |
| CN102111215A (en) * | 2010-12-23 | 2011-06-29 | 中兴通讯股份有限公司 | Method and device for synchronizing configuration data |
| CN113038530B (en) * | 2021-03-22 | 2021-09-28 | 军事科学院系统工程研究院网络信息研究所 | High-efficiency transmission method for packet service of QoS guarantee of satellite mobile communication system |
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| EP1187422A2 (en) * | 2000-09-11 | 2002-03-13 | Sun Microsystems, Inc. | Method and device for tunable packet arbitration |
| CN1601986A (en) * | 2003-09-26 | 2005-03-30 | 三星电子株式会社 | Ethernet passive optical network for integrating broadcast and communication based on time division multiplexing scheme |
| CN1625262A (en) * | 2003-12-03 | 2005-06-08 | 北京泰美世纪科技有限公司 | Framing method based on LDPC |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1187422A2 (en) * | 2000-09-11 | 2002-03-13 | Sun Microsystems, Inc. | Method and device for tunable packet arbitration |
| CN1601986A (en) * | 2003-09-26 | 2005-03-30 | 三星电子株式会社 | Ethernet passive optical network for integrating broadcast and communication based on time division multiplexing scheme |
| CN1625262A (en) * | 2003-12-03 | 2005-06-08 | 北京泰美世纪科技有限公司 | Framing method based on LDPC |
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