CN101515830A - Transmission method for program key of multimedia broadcast service - Google Patents
Transmission method for program key of multimedia broadcast service Download PDFInfo
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- CN101515830A CN101515830A CNA2008100059391A CN200810005939A CN101515830A CN 101515830 A CN101515830 A CN 101515830A CN A2008100059391 A CNA2008100059391 A CN A2008100059391A CN 200810005939 A CN200810005939 A CN 200810005939A CN 101515830 A CN101515830 A CN 101515830A
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Abstract
The invention discloses a transmission method for a program key of a multimedia broadcast service, which comprises the following steps that: a multimedia service platform generates service guide, wherein the service guide carries port information for transmitting program key stream; and a mobile phone terminal acquires the service guide from the multimedia service platform and receives the program key stream transmitted by the multimedia service platform at the analyzed port. The method adds session description information to the service guide through the multimedia service platform, and marks the port information for transmitting the program key and the corresponding relation between the program key and media stream in the session description information so as to notify the mobile phone terminal to receive the port of the program key, thereby realizing the flexible configuration of a transmission port and the flexible correspondence between the program key and the media stream.
Description
Technical field
The present invention relates to multi-media broadcasting service, relate in particular to the transfer approach of program key in a kind of multi-media broadcasting service.
Background technology
Multi-media broadcasting service comprises mobile phone TV services and mobile phone broadcasting service etc., and mobile phone TV services are meant by mobile phone terminal and receive the video coding signal that wireless mode transmits, and the business of decoding and playing.Multi-media broadcasting service is not subjected to the restriction of conditions such as time, place, has strengthened people and has obtained the convenience of information or amusement.For guaranteeing the legal use multi-media broadcasting service of user, grid can adopt key that the media content of transmission is encrypted.
Relatively Chang Yong cipher mode is three layers of safe key system, that is: at first, set up cipher key shared between mobile phone terminal and the multimedia service platform, this shared key can adopt several different methods to set up, as, general autonomous framework (GBA) process that can adopt third generation partner program (3gpp) to formulate; Secondly, multimedia service platform will adopt the business cipher key of sharing secret key encryption to send mobile phone terminal to, and mobile phone terminal adopts shared key that business cipher key is decrypted; Once more, the program key that multimedia service platform will adopt business cipher key to encrypt sends mobile phone terminal to, and mobile phone terminal adopts business cipher key that program key is decrypted again.After finishing three layers of keys foundation, mobile phone terminal just can be decrypted the employing program key encrypted media content that receives from multimedia service platform, and the broadcast of decoding.
Under existing three layers of key code system, multimedia service platform adopts and send program key to mobile phone terminal on fixed port, but this method does not have flexibility, and is occupied or just can't transmit when needing port to change at the port of mobile phone terminal.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of in multi-media broadcasting service, when adopting three layers of key code system, realizes the delivery port of business cipher key is carried out the transfer approach of program key in the multi-media broadcasting service of flexible configuration.
For solving the problems of the technologies described above, the transfer approach of program key in a kind of multi-media broadcasting service of the present invention comprises following steps: multimedia service platform generates business guide, carries the port information that transmits program key stream in business guide; Mobile phone terminal obtains described business guide from multimedia service platform, receives the program key stream that multimedia service platform sends on the described port that is resolved to.
Further, multimedia service platform is by adding session description information in business guide, and the port information of record transmission program key stream makes and carries the port information that transmits program key stream in the business guide in session description information.
Further, mobile phone terminal is behind the described port that is resolved to, and the program key stream that receives the multimedia service platform transmission carries out port before and monitors on described port.
Further, multimedia service platform adopts the mode of stream to send program key stream on described port.
Further, multimedia service platform sent business cipher key to mobile phone terminal before generating business guide, also comprise following steps after mobile phone terminal receives the program key stream that multimedia service platform sends: mobile phone terminal uses the business cipher key that receives that program key stream is deciphered, and obtains program key.
Further, also comprising the flow label of program key stream and the medium stream information of a plurality of Media Streams in described session description information describes, in describing, medium stream information identifies the corresponding relation that has Media Stream and the program key that is used for decrypt media stream to flow respectively, when described multimedia service platform sends program key stream, also send Media Stream to mobile phone terminal, mobile phone terminal is after receiving Media Stream, according to the corresponding relation between program key and the Media Stream, traffic identifier according to program key finds program key, use program key that the Media Stream that receives is decrypted the broadcast of decoding again.
Further, also record the port information that sends Media Stream in described medium stream information is described, the port of this transmission Media Stream is different ports with the transmit port of program key stream.
Further, described port is User Datagram Protoco (UDP) 49230 ports.
In sum, method of the present invention adds session description information by multimedia service platform in business guide, the corresponding relation of the port information of token-passing program key and program key and Media Stream in session description information, notify the port of mobile phone terminal program receiving key with this, thereby realized flexible corresponding between the flexible configuration of delivery port and program key and the Media Stream.
Description of drawings
Fig. 1 is the system diagram of the multimedia broadcast service system of method application of the present invention;
Fig. 2 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated:
As shown in Figure 1, the multimedia broadcast service system that method of the present invention is used comprises: mobile phone terminal, multi-media broadcasting service platform and transmission bearer network, wherein,
Mobile phone terminal is supported three layers of key code system of mobile phone TV services; Support is set up many communication links and is received the data that transmit from the broadcasting of transmission bearer network, and can adopt different ports to receive; Broadcast can be decrypted, decode the Media Stream that receives from television platform; And can adopt interactive mode to obtain business guide (SG) on the television platform, and SG is resolved, information from SG, obtained;
Multimedia service platform supports that program key generates, media business is managed, media stream privacy; Can pass through to transmit bearer network, and adopt different ports respectively to mobile phone terminal broadcast media stream and program key to mobile phone terminal broadcast media stream, program key; Can generate SG, and in SG, add session description information (SDP), instruct mobile phone terminal correctly to receive;
Transmitting bearer network is used for multimedia service platform is carried, sent to the data that mobile phone terminal sends.
Below in conjunction with accompanying drawing method of the present invention is elaborated, describes with the example that is applied as of method of the present invention in mobile phone TV services, at this, multimedia service platform is a television platform:
As shown in Figure 2, this method comprises following steps:
Step 201: television platform is finished after mobile phone terminal sends business cipher key, generate SG according to media information, in SG, add SDP, in SDP, record the port numbers that program key transmits, the traffic identifier of program key stream, the medium stream information that also includes a plurality of Media Streams in SDP is described, and records the transmission end slogan of this Media Stream in each medium stream information is described respectively, and sign has program key corresponding with this Media Stream, that be used for Media Stream is decrypted to flow;
Can adopt User Datagram Protoco (UDP) (udp) 49230 ports to transmit program key in the present embodiment, in SDP, can adopt following form to represent that the delivery port of program key is the udp49230 port:
m＝application?49230udp?vnd.oma.bcast.stkm；
Traffic identifier as program key is 10, can adopt following form to represent that the traffic identifier of program key is 10, and encryption type is digital copyright management (DRM) pattern:
a＝fmtp:vnd.oma.bcast.stkm?streamid＝10；
kmstype＝oma-bcast-drm-pki；
Can adopt following form to represent the provider of mobile TV program:
serviceprovider＝DiscountBcast；
Following field can be write in the medium stream information description of a certain Media Stream, represent that this Media Stream and program key stream 10 has corresponding relation, that is, program key stream 10 can be used for this Media Stream is decrypted:
a＝stkmstream:10。
Step 202: the mobile phone terminal user carries out the multimedia handset television services by television platform and orders, and after finishing service order, obtains SG;
Step 203: mobile phone terminal is resolved SG after getting access to SG, and intercepts on the port of the transmission program key that parses from the SDP of SG;
In the present embodiment, this port is the udp49230 port.
Step 204: television platform adopts on the port of mode appointment in SDP of flowing, to mobile phone terminal broadcast program key stream;
In the present embodiment, television platform on the udp49230 port to mobile phone terminal broadcast program key stream.
Step 205: mobile phone terminal program receiving key stream;
Step 206: mobile phone terminal uses the business cipher key that receives that program key stream is deciphered after receiving program key stream, obtains program key;
Step 207: simultaneously, send Media Stream to mobile phone terminal on the delivery port of television platform Media Stream of record in the medium stream information of SDP is described, receiving media stream on the delivery port of the Media Stream of record during the medium stream information of mobile phone terminal in the SDP that is resolved to described;
Step 208: mobile phone terminal is after receiving Media Stream, according to the Media Stream of sign in the medium stream information description of the SDP that is resolved to and the corresponding relation of program key stream, traffic identifier according to program key finds program key, and use program key that the Media Stream that receives is decrypted, the broadcast of decoding again, this method finishes.
Certainly; the present invention also can have other embodiment; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought 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 (8)
1, the transfer approach of program key in a kind of multi-media broadcasting service is characterized in that, comprises following steps:
Multimedia service platform generates business guide, carries the port information that transmits program key stream in business guide;
Mobile phone terminal obtains described business guide from multimedia service platform, receives the program key stream that multimedia service platform sends on the described port that is resolved to.
2, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 1, it is characterized in that, described multimedia service platform is by adding session description information in business guide, the port information of record transmission program key stream makes and carries the port information that transmits program key stream in the business guide in session description information.
3, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 1, it is characterized in that, described mobile phone terminal is behind the described port that is resolved to, and the program key stream that receives the multimedia service platform transmission carries out port before and monitors on described port.
4, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 1 is characterized in that, described multimedia service platform adopts the mode of stream to send program key stream on described port.
5, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 2, it is characterized in that, multimedia service platform sent business cipher key to mobile phone terminal before generating business guide, also comprise following steps after mobile phone terminal receives the program key stream that multimedia service platform sends: mobile phone terminal uses the business cipher key that receives that program key stream is deciphered, and obtains program key.
6, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 5, it is characterized in that, also comprising the flow label of program key stream and the medium stream information of a plurality of Media Streams in described session description information describes, in describing, medium stream information identifies the corresponding relation that has Media Stream and the program key that is used for decrypt media stream to flow respectively, when described multimedia service platform sends program key stream, also send Media Stream to mobile phone terminal, mobile phone terminal is after receiving Media Stream, according to the corresponding relation between program key and the Media Stream, traffic identifier according to program key finds program key, use program key that the Media Stream that receives is decrypted the broadcast of decoding again.
7, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 6, it is characterized in that, also record the port information that sends Media Stream in described medium stream information is described, the port of this transmission Media Stream is different ports with the transmit port of program key stream.
8, the transfer approach of program key in the multi-media broadcasting service as claimed in claim 1 is characterized in that, described port is User Datagram Protoco (UDP) 49230 ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100059391A CN101515830A (en) | 2008-02-18 | 2008-02-18 | Transmission method for program key of multimedia broadcast service |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100059391A CN101515830A (en) | 2008-02-18 | 2008-02-18 | Transmission method for program key of multimedia broadcast service |
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| CN101515830A true CN101515830A (en) | 2009-08-26 |
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| CNA2008100059391A Pending CN101515830A (en) | 2008-02-18 | 2008-02-18 | Transmission method for program key of multimedia broadcast service |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010069134A1 (en) * | 2008-12-15 | 2010-06-24 | 中国移动通信集团公司 | Data file decryption method, decryption device and data broadcasting system |
| CN102143129A (en) * | 2010-05-26 | 2011-08-03 | 华为软件技术有限公司 | Method and system for realizing service protection in hyper text transmission protocol (HTTP) streaming transmission |
-
2008
- 2008-02-18 CN CNA2008100059391A patent/CN101515830A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010069134A1 (en) * | 2008-12-15 | 2010-06-24 | 中国移动通信集团公司 | Data file decryption method, decryption device and data broadcasting system |
| CN101753589B (en) * | 2008-12-15 | 2012-12-12 | 中国移动通信集团公司 | Method and device for decrypting data file and data broadcast system |
| US8984270B2 (en) | 2008-12-15 | 2015-03-17 | China Mobile Communications Corporation | Data file decryption method, decryption device and data broadcasting system |
| CN102143129A (en) * | 2010-05-26 | 2011-08-03 | 华为软件技术有限公司 | Method and system for realizing service protection in hyper text transmission protocol (HTTP) streaming transmission |
| CN102143129B (en) * | 2010-05-26 | 2015-03-18 | 华为软件技术有限公司 | Method and system for realizing service protection in hyper text transmission protocol (HTTP) streaming transmission |
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Open date: 20090826 |