CN101325480B - Scrambling control method and apparatus based on multiplexed sub frame - Google Patents
Scrambling control method and apparatus based on multiplexed sub frame Download PDFInfo
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- CN101325480B CN101325480B CN2007101110719A CN200710111071A CN101325480B CN 101325480 B CN101325480 B CN 101325480B CN 2007101110719 A CN2007101110719 A CN 2007101110719A CN 200710111071 A CN200710111071 A CN 200710111071A CN 101325480 B CN101325480 B CN 101325480B
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Abstract
The invention provides a scrambling control method base on multiplexing sub-frame, including: using multiplexing sub-frames to load scrambled media information, wherein, the media information includes data segment, a video segment and an audio segment; and using the sub-frame head of the multiplexing sub-frames to set up a scrambling symbol, in order to indicate whether the loaded media information has been scrambled; using the data segment loaded by the multiplexing sub-frames to package the scrambled control information and data file content, wherein, the control information includes EMM/ECM information and service instruction information.
Description
Technical field
The present invention relates to the multimedia broadcasting field, relate in particular to the scrambling control method and the device based on multiplexed sub frame of CMMB.
Background technology
Present multimedia broadcasting network is meant digital multimedia broadcasting network, comprises satellite multimedia broadcasting, ground digital television broadcast, digital audio broadcasting, based on the cable tv broadcast of coaxial cable, based on multimedia broadcasting networks such as the data broadcasting of coaxial cable broadcast system, CMMBs.
Along with the development of China mobile multi-media broadcasting technology and terminal technology, portable terminals such as handheld terminal receive user's welcome day by day, yet CMMB operator is in order to realize good operation; Only the non-multimedia service of opening is provided to the user who pays or authorize; And contents such as advertisement can be opened to all users, realize the income of advertisement aspect, therefore; Need signal scrambling technique to guarantee the content of non-opening is carried out scrambling, guarantee the commercial interest of operator.
Encryption authorization is a kind of technology of multi-media broadcasting service control, and it only allows authorized users to use specific business, then can't use specific business for unwarranted user.
The encryption authorization system realizes the empowerment management and reception control of multi-media broadcasting service; This system relates to a plurality of network elements of multimedia broadcasting network; And relate to multinomial technology, comprise that key generation, cipher controlled, medium scrambling control, terminal comprise the condition reception technique of smart card etc.
In order to realize that user key generates management and user key and business cipher key (or group key) safety and sends, also can realize through the technology of mobile communication network.
The encryption authorization nucleus module is mainly key control module and scrambling control module, and wherein, key control module is responsible for the management of four layers of key and the processing of secret key encryption, and the scrambling control module is responsible for media content is carried out scrambling.
Interface between cipher controlled and the business guide mainly is one of the every renewal of business guide when professional, initiates key request to the cipher controlled system, and the cipher controlled system is to each professional business cipher key that generates.
The interface of scrambling control module and cipher controlled mainly is that (Control Word CW) sends to the scrambling control module to cipher controlled the control word of recent renewal.In order to make the content of the scrambling that the terminal can descrambling receives; Need control word CW be encrypted authorization control message (the Entitlement Control Message that the back forms according to the control of key control module; ECM) and entitlement management message (Entitlement Management Message EMM) sends the terminal receiver module to.For the ease of the reception at terminal, should transmit content and relevant ECM and EMM message after the scrambling effectively.
The key hierarchy of CMMB is as shown in Figure 1, wherein, divides sandwich construction to manage; Be respectively: user key (Master Private Key; MPK), business cipher key (Service Key, SK), group key (Group Key, GK), control word CW.
Wherein, business cipher key SK, group key GK, these three layers of keys of control word CW all issue through the broadcast downstream network, and user key MPK is written on the smart card through direct burned smart card or through miscellaneous equipment.Need to consider to reduce the frequent shared bandwidth of single business cipher key of sending.If the mobile communications network through two-way issues, can only need three layers of cipher controlled, that is, and user key, business cipher key, and control word.User key and business cipher key also can issue management through the mobile network is point-to-point, and control word CW sends and be transferred to receiving terminal through radio network, therefore must carry out encipherment protection to it.At first CW is encrypted during encryption and form ECM through business cipher key (SK); Then, (Personal Distributed Key PDK) encrypts formation EMM to SK through individual distributing key.That really on CMMB, transmit is ECM and EMM, progressively solves the upper strata key through the local key in the smart card during deciphering, obtains CW at last.
In GY/T220.2-2006 " CMMB part 2: multiplexing " standard, stipulated video, audio frequency, the data in mobile multimedia broadcast system and comprised the multiplexed frame structure of the various control informations of ESG (business guide).Wherein, corresponding one an of multiplexed frame is controlled or service logical channels.Each multiplexed frame distributes a multiplexed frame sign MF_ID, and wherein MF_ID is that 0 multiplexed frame is mapped to the control logic channel, and simultaneously, a multiplexed frame is made up of a plurality of multiplexed sub frames.
Fig. 2 shows the multiplexed sub frame structure of not introducing scrambling, the multiplexed sub frame form that just defines in the existing standard.As shown in Figure 2, each multiplexed sub frame is made up of four parts, respectively seat frame head, video-frequency band, audio section, data segment.Wherein, the subframe head has encapsulated some overall informations of video-frequency band, audio section, data segment.Judge whether to comprise the length of video-frequency band, audio section, data segment and each video-frequency band, audio section, data segment through the subframe head, in addition, can also judge the initial reproduction time of this multiplexed sub frame.
Can find out through above description, in above-mentioned standard, for the not explanation of scrambling of video, audio frequency, data.And for the safety of multi-media broadcasting service, be necessary to the scrambling of multi-media broadcasting service.Therefore, need further study and perfect for the scrambling of mobile multimedia control.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, the present invention aims to provide a kind of scheme that realizes multimedia scrambling control.
According to embodiments of the invention, a kind of scrambling control method based on multiplexed sub frame is provided.
This method comprises following processing: use multiplexed sub frame to carry the media information of scrambling, wherein, media information comprises: data segment, video-frequency band and audio section; Use the subframe head of multiplexed sub frame that the scrambling sign is set, whether the media information that carries with indication passes through scrambling; Use multiplexed sub frame data carried by data section to encapsulate the control information and the content data file of scrambling, wherein, control information comprises: EMM/ECM information, business guide information.
Wherein, use the reservation position in the subframe head that the scrambling sign is set.
The scrambling sign can have the multidigit multibyte; Like this; Can use the different value of scrambling sign or not coordination come designation data section, video-frequency band or audio section whether to pass through scrambling; Further, can use the different value of scrambling sign or not coordination come data flow, video flowing or the audio stream of designation data section, video-frequency band or audio section whether to pass through scrambling.
Perhaps, the scrambling sign comprises data segment scrambling sign and/or video-frequency band scrambling sign and/or audio section scrambling sign, and whether designation data section, video-frequency band, audio section pass through scrambling respectively.
The data segment of bear control information comprises data segment header and at least one data cell.Wherein, use each data cell to encapsulate control information.When control information was ECM/EMM information, data cell comprised ECM/EMM data unit header, the quiet lotus of ECM/EMM data and cyclic redundancy code, wherein, used the ECM/EMM data unit header to come the brief information of encapsulated data units.
In addition, use the data segment header loaded information to comprise: the number of data cell, the parameter of each data cell, data cell type indicator, and error correcting code.Wherein, which data cell the data cell type indicator in the use data segment header indicates and has encapsulated control information.
According to embodiments of the invention, a kind of scrambling control device based on multiplexed sub frame is provided also.
This device comprises: the media information supporting part of scrambling, and be used to use multiplexed sub frame to carry the media information of scrambling, wherein, media information comprises: data segment, video-frequency band, audio section; The scrambling sign is provided with portion, is used for using the reservation position of the subframe head of multiplexed sub frame that the scrambling sign is set, and whether the media information that carries with indication passes through scrambling; The control information supporting part is used to use multiplexed sub frame data carried by data section to encapsulate the control information and the content data file of scrambling, and wherein, control information comprises: EMM/ECM information, business guide information.
Through technique scheme of the present invention; In the multiplexed frame of GY/T220.2-2006 " CMMB part 2: multiplexing " definition, introduce EMM/ECM; Whether clear and definite CMMB carries out scrambling; And be convenient to multiplexed sub frame is resolved, thereby realized the safe transmission of multimedia broadcast contents.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the key hierarchy of the CMMB of correlation technique;
Fig. 2 is the sketch map according to the multiplexed sub frame structure of correlation technique;
Fig. 3 is the flow chart based on the scrambling control method of multiplexed sub frame according to the embodiment of the invention;
Fig. 4 is the sketch map according to the multiplexed sub frame structure of the introducing scrambling of the embodiment of the invention;
Fig. 5 is the sketch map according to the multiplexed sub frame data segment encapsulating structure of the embodiment of the invention;
Fig. 6 is the sketch map according to the ECM/EMM structure of utilizing the data segment encapsulation of the embodiment of the invention; And
Fig. 7 is the block diagram based on the scrambling control device of multiplexed sub frame according to the embodiment of the invention.
Embodiment
In embodiments of the present invention, a kind of scrambling control method and device based on multiplexed sub frame is provided, wherein; Carry video, audio frequency, the data of scrambling through independent multiplexed sub frame; In addition, in multiplexed sub frame, add the sign whether video, audio frequency, data in this multiplexed sub frame carry out scrambling; If scrambling has been carried out in the indication of scrambling sign, then video, audio frequency, data have been carried out scrambling.Meticulousr for later control, the scrambling mark of introducing can multidigit, and coordination can not identify different videos, audio frequency, data scrambling situation.
Below will describe embodiments of the invention in detail with reference to accompanying drawing, should be appreciated that describe following examples with provide to of the present invention comprehensively and thorough, rather than the present invention carried out any restriction.
Method embodiment
As shown in Figure 3, comprise following processing according to the scrambling control method based on multiplexed sub frame of present embodiment:
Step S302 uses multiplexed sub frame to carry the media information of scrambling, and wherein, media information comprises: data segment, video-frequency band and audio section; Step S304 uses the subframe head of multiplexed sub frame that the scrambling sign is set, and whether the media information that carries with indication passes through scrambling; Step S306 uses multiplexed sub frame data carried by data section to encapsulate the control information and the content data file of scrambling, and wherein, control information comprises: EMM/ECM information, business guide information.
Fig. 4 shows the sketch map of introducing the multiplexed sub frame structure of scrambling through above processing, wherein, uses the reservation position in the subframe head that the scrambling sign is set." quiet lotus whether scrambling " field among Fig. 4 is above-mentioned scrambling sign.
The scrambling sign can have the multidigit multibyte; Like this; Can use the different value of scrambling sign or not coordination come designation data section, video-frequency band or audio section whether to pass through scrambling; Further, through the expansion, can use the different value of scrambling sign or not coordination come data flow, video flowing or the audio stream of designation data section, video-frequency band or audio section whether to pass through scrambling.Perhaps, also can use a value to indicate all data segments, video-frequency band, audio section whether to pass through scrambling.
On the other hand, the scrambling sign can comprise data segment scrambling sign and/or video-frequency band scrambling sign and/or audio section scrambling sign, and whether designation data section, video-frequency band, audio section pass through scrambling respectively.That is, in data segment scrambling sign, video-frequency band scrambling sign, the audio section scrambling sign any can be set separately.
In step S306, the data segment of bear control information comprises data segment header and a plurality of (at least one) data cell, and for example, Fig. 5 shows the encapsulating structure of multiplexed sub frame data segment.As shown in Figure 5, can use the data segment header loaded information to comprise: the number of data cell, the parameter of each data cell, data cell type indicator, and error correcting code; Control informations such as each data cell can the encapsulation of data file content, business guide information or ECM/EMM, or other content of expressing through data mode.Can use data cell type indicator in the data segment header to indicate which data cell and encapsulate control information (for example, ECM/EMM).
Fig. 6 shows the ECM/EMM structure of utilizing the data segment encapsulation.As shown in Figure 6, when control information was ECM/EMM information, this data cell had comprised this EMM/ECM data unit header, the quiet lotus of EMM/ECM data and CRC (error correcting code).The EMM/ECM data cell brief information of EMM/ECM data unit header encapsulation comprises the table sign, version number; Protocol type; And the quiet lotus type of EMM/ECM data, according to the needs of business development, can change adjustment to field in the EMM/ECM head in the EMM/ECM data cell.EMM/ECM can realize that the encapsulation of a plurality of EMM and ECM is sent through taking a plurality of data cells.
Device embodiment
As shown in Figure 7, comprise according to the scrambling control device 700 based on multiplexed sub frame of present embodiment:
The media information supporting part 702 of scrambling is used to use multiplexed sub frame to carry the media information of scrambling, and wherein, media information comprises: data segment, video-frequency band, audio section; The scrambling sign is provided with portion 704, is used for using the reservation position of the subframe head of multiplexed sub frame that the scrambling sign is set, and whether the media information that carries with indication passes through scrambling; Control information supporting part 706 is used to use multiplexed sub frame data carried by data section to encapsulate the control information and the content data file of scrambling, and wherein, control information comprises: EMM/ECM information, business guide information.
Need to prove that a plurality of details of describing among the method embodiment go for this apparatus embodiments equally, therefore, omitted being repeated in this description same or similar content.
Technical scheme through above description can be found out by means of the present invention, can whether carry out scrambling by clear and definite CMMB, thus the safe transmission of realization multimedia broadcast contents.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the scrambling control method based on multiplexed sub frame is characterized in that, comprises following processing:
Use multiplexed sub frame to carry the media information of scrambling, wherein, said media information comprises: data segment, video-frequency band and audio section;
Use the subframe head of multiplexed sub frame that the scrambling sign is set; Whether the media information that carries with indication passes through scrambling; Said scrambling sign comprises data segment scrambling sign and/or video-frequency band scrambling sign and/or audio section scrambling sign, indicates said data segment, video-frequency band, audio section whether to pass through scrambling respectively; Said scrambling sign has the multidigit multibyte, use the different value of said scrambling sign or not coordination indicate said data segment, video-frequency band or audio section whether to pass through scrambling; And
Use said data segment that said multiplexed sub frame carries to encapsulate the control information and the content data file of scrambling, wherein, said control information comprises: EMM/ECM information, business guide information.
2. scrambling control method according to claim 1 is characterized in that, uses the reservation position in the said subframe head that said scrambling sign is set.
3. scrambling control method according to claim 1 is characterized in that, use the different value of said scrambling sign or not coordination indicate data flow, video flowing or the audio stream of said data segment, video-frequency band or audio section whether to pass through scrambling.
4. scrambling control method according to claim 1 is characterized in that, the said data segment that encapsulates said control information comprises data segment header and at least one data cell.
5. scrambling control method according to claim 4 is characterized in that, uses each said data cell to encapsulate said control information.
6. scrambling control method according to claim 4; It is characterized in that; When said control information is said ECM/EMM information; Said data cell comprises ECM/EMM data unit header, the quiet lotus of ECM/EMM data and cyclic redundancy code, wherein, uses said ECM/EMM data unit header to encapsulate the brief information of said data cell.
7. scrambling control method according to claim 4 is characterized in that, uses said data segment header loaded information to comprise: the number of said data cell, the parameter of each data cell, data cell type indicator and error correcting code.
8. according to right 7 described scrambling control methods, it is characterized in that, use said data cell type indicator in the said data segment header to indicate which data cell and encapsulated said control information.
9. the scrambling control device based on multiplexed sub frame is characterized in that, comprising: the media information supporting part of scrambling, and be used to use multiplexed sub frame to carry the media information of scrambling, wherein, said media information comprises: data segment, video-frequency band, audio section;
The scrambling sign is provided with portion; Be used for using the reservation position of the subframe head of said multiplexed sub frame that the scrambling sign is set; Whether the media information that carries with indication passes through scrambling; Said scrambling sign comprises data segment scrambling sign and/or video-frequency band scrambling sign and/or audio section scrambling sign, indicates said data segment, video-frequency band, audio section whether to pass through scrambling respectively; Said scrambling sign has the multidigit multibyte, use the different value of said scrambling sign or not coordination indicate said data segment, video-frequency band or audio section whether to pass through scrambling; And
The control information supporting part is used to use said data segment that said multiplexed sub frame carries to encapsulate the control information and the content data file of scrambling, and wherein, said control information comprises: EMM/ECM information, business guide information.
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| CN2007101110719A CN101325480B (en) | 2007-06-13 | 2007-06-13 | Scrambling control method and apparatus based on multiplexed sub frame |
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| CN101860795A (en) * | 2009-04-09 | 2010-10-13 | 中兴通讯股份有限公司 | Sending and receiving method and device of flow classification scrambling instruction information |
| CN111105744A (en) * | 2019-12-31 | 2020-05-05 | 上海易维视科技有限公司 | Embedded display port implementation method and system based on programmable logic |
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