CN101442664B - Terminal, system and method for previewing program in mobile multimedia broadcast system - Google Patents
Terminal, system and method for previewing program in mobile multimedia broadcast system Download PDFInfo
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- CN101442664B CN101442664B CN200810188174XA CN200810188174A CN101442664B CN 101442664 B CN101442664 B CN 101442664B CN 200810188174X A CN200810188174X A CN 200810188174XA CN 200810188174 A CN200810188174 A CN 200810188174A CN 101442664 B CN101442664 B CN 101442664B
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Abstract
The invention discloses a terminal for previewing programs in a mobile multimedia broadcasting system, which comprises a communication module, a conditional access terminal subsystem, and a playing module. A system for previewing the programs in the mobile multimedia broadcasting system comprises the terminal and network side equipment, wherein the network side equipment comprises a conditional access front-end subsystem; and the terminal comprises the communication module, the conditional access terminal subsystem, and the playing module. A method for previewing the programs in the mobile multimedia broadcasting system comprises: when a user intends to initiate the preview to certain program in an electronic service instruction received by the terminal, the terminal sends a preview request to the network side equipment; after receiving an authorization message for previewing the program returned by the network side equipment, the terminal intercepts one section of a program media stream of the program according to the authorization message to display to the user for previewing. After the method is adopted, the user can directly use the program media stream to preview, so the bandwidth resource is greatly saved, and the burden of the network side equipment is lightened.
Description
Technical field
The present invention relates to filed of mobile multimedia broadcasting, terminal, the system and method for previewing program in particularly a kind of mobile multimedia broadcast system.
Background technology
Mobile multimedia broadcast conditional receiving system (Mobile MultimediaBroadcasting-Conditional Access System; be called for short MMB-CAS) can be mobile multi-media broadcasting service protection in the transmission course is provided, promptly at the broadcast channel protection of business.Mobile Multimedia Broadcasting operator adds the MMB-CAS condition at mobile multi-media service usually and receives controlling mechanism when broadcasting.After adopting MMB-CAS, Mobile Multimedia Broadcasting operator can organize mandate to designated user or user at business or business packet, makes that having only authorized user or user to organize could receive related service.
Among radio, film and television industry standard in State Administration of Radio Film and Television's issue: the GY/T220.6-2008 " Mobile Multimedia Broadcasting the 6th part: condition receives ", regulation MMB-CAS is divided into front terminal system and terminal subsystem two parts, and it constitutes as shown in Figure 1.Wherein:
Condition receiving front-end subsystem is mainly by encryption authorization front-end module (Encryption andAuthorization Module-Server, abbreviate EAM-S as), stored value card front-end module (ElectronicPurse Module-Server, abbreviate EPM-S as) and the scrambling module formation, wherein, EAM-S and EPM-S are collectively referred to as condition receiving front-end module (Conditional Access Module-Server abbreviates CAM-S as);
Conditional access terminal subsystem is mainly by encryption authorization terminal module (Encryption andAuthorization Module-Client, abbreviate EAM-C as), electronic purse terminal module (ElectronicPurse Module-Client, abbreviate EPM-C as) and the descrambling module formation, wherein, EAM-C and EPM-C are collectively referred to as conditional access terminal module (Conditional Access Module-Client abbreviates CAM-C as).
Conditional access terminal subsystem is arranged in mobile multi-media broadcast terminal.When the user uses mobile multi-media broadcast terminal to receive Mobile Multimedia Broadcasting, the video/audio stream of the demodulation of terminal/demultiplexing module output process scrambling and data are to descrambling module, output scrambling parameter, rate information, ECM (EntitlementControl Message, Entitlement Control Message) and EMM data such as (Entitlement Management Message, Entitlement Management Messages) to EAM-C and EPM-C; EAM-C and EPM-C verify rate information, user profile and ordering information etc., and SEK (Service Encryption Key, business cipher key) and CW (Control Word, control word) are decrypted, and finally export CW to descrambling module; Descrambling module outputs to player after with the CW that receives the video/audio stream of scrambling and data being carried out descrambling, is shown to the user and watches.
When watching Mobile Multimedia Broadcasting, the user usually can be according to electron service instruction (ElectronicService Guide, abbreviation ESG; Also can be described as the tabulation of electronic program guides, electronic service guidebooks or electronic programming) select oneself to want channel and the program watched, order then.From user perspective, final determine to order before, the user wishes can previewing program, so that after this programme content being had an impression intuitively, whether decision will order again.
In the middle of digital multimedia broadcasting systems such as traditional cable digital TV, satellite television, the method for previewing of employing is to carry a previewing programs fragment of making in advance in electron service instruction.The user is after entering electron service instruction, if selected a program of not ordering as yet, then terminal can receive the preview fragment of this program, plays to the user and watches.This previewing programs fragment is that operator shifts to an earlier date the good content of editing, adds in the electron service instruction by network equipment when program broadcasts.
For the resourceful system of cable digital TV equiband, in electron service instruction, carry the previewing programs fragment of making in advance, the use of bandwidth resources is not had too much influence.But in mobile multimedia broadcast system, because wireless bandwidth resource is very limited, if in electron service instruction, carry a large amount of special previewing programs fragments, can take more bandwidth, thereby cause the available bandwidth of program media stream to significantly reduce, be unfavorable for effective utilization of bandwidth resources.
Summary of the invention
The technical problem to be solved in the present invention provides terminal, the system and method for previewing program in a kind of mobile multimedia broadcast system, avoids owing to carrying the waste bandwidth problem of resource that special previewing programs fragment causes.
For addressing the above problem, the invention provides the terminal of previewing program in a kind of mobile multimedia broadcast system, comprise communication module, conditional access terminal subsystem and playing module;
Described conditional access terminal subsystem is used for sending preview request by described communication module to network equipment when the user will initiate the preview of certain program of electron service instruction that terminal is received; Also be used for receive that described network equipment returns this program is carried out the authorization message of preview after, in the program media stream of described program, intercept out one section according to described authorization message; Carry the program corresponding service key and/or the preview time limit of asking preview with described user in the described authorization message;
Described playing module is used for playing the described program media stream that intercepts out to described user.
Further, above-mentioned terminal also can have following feature:
Carry the identification information that described user asks the program of preview in the described preview request;
Carry in the described authorization message and described identification information corresponding service key;
Described conditional access terminal subsystem is used for utilizing the business cipher key that receives to decrypt control word from Entitlement Control Message, and after with described control word the program stream of described program being carried out descrambling, intercepts out the program media stream of a period of time length.
Further, above-mentioned terminal also can have following feature:
Carry the preview time limit in the described authorization message;
Described conditional access terminal subsystem is used for intercepting out one section according to the value in described preview time limit from described program media stream, and the time period length of this section program media stream is smaller or equal to the value in described preview time limit.
The present invention also provides the system of previewing program in a kind of mobile multimedia broadcast system, comprises terminal and network equipment, comprises condition receiving front-end subsystem in the described network equipment; Comprise communication module, conditional access terminal subsystem and playing module in the described terminal;
Described conditional access terminal subsystem is used for sending preview request by described communication module to described condition receiving front-end subsystem when the user will initiate the preview of certain program of electron service instruction that terminal is received; Also be used for receive that described condition receiving front-end subsystem returns this program is carried out the authorization message of preview after, in the program media stream of described program, intercept out one section according to described authorization message; Carry the program corresponding service key and/or the preview time limit of asking preview with described user in the described authorization message;
Described condition receiving front-end subsystem is used for issuing described authorization message according to the described preview request that receives to described conditional access terminal subsystem;
Described playing module is used for playing the described program media stream that intercepts out to described user.
Further, said system also can have following feature:
Carry the identification information that described user asks the program of preview in the described preview request;
Described condition receiving front-end subsystem is used for issuing described authorization message according to the described identification information that receives to described conditional access terminal subsystem, wherein carries and described identification information corresponding service key;
Described conditional access terminal subsystem is used for utilizing the business cipher key that receives to decrypt control word from Entitlement Control Message, and after with described control word the program stream of described program being carried out descrambling, intercepts out the program media stream of a period of time length.
Further, said system also can have following feature:
Carry the preview time limit in the described authorization message;
Described conditional access terminal subsystem is used for intercepting out one section according to the value in described preview time limit from described program media stream, and the time period length of this section program media stream is smaller or equal to the value in described preview time limit.
Further, said system also can have following feature:
Described condition receiving front-end subsystem also is used for determining to draw the described preview time limit according to the described preview request message that receives.
Further, said system also can have following feature:
The business cipher key that is handed down to described terminal is the occasional service key that described condition receiving front-end subsystem generates according to the described preview request message that receives;
After described user finished previewing programs, described business cipher key cancelled.
Further, said system also can have following feature:
The user totem information that also comprises described user in the described preview request message;
Described condition receiving front-end subsystem also is used for after receiving described preview request message, according to the described user totem information that wherein carries described user is verified earlier.
The present invention also provides the method for previewing program in a kind of mobile multimedia broadcast system, comprising:
During the preview of certain program, described terminal sends preview request to network equipment in the electron service instruction that the user will initiate terminal is received; Receive that described network equipment returns this program is carried out the authorization message of preview after, in the program media stream of described program, intercept out one section according to described authorization message, show described user's preview; Carry the program corresponding service key and/or the preview time limit of asking preview with described user in the described authorization message.
Further, said method also can have following feature:
Carry the identification information that described user asks the program of preview in the described preview request;
Described network equipment carries in the described authorization message that described terminal is returned and described identification information corresponding service key;
Described terminal intercepts out one section according to described authorization message in the program media stream of described program, show described user's preview to be meant: the business cipher key that described terminal utilization receives decrypts control word from Entitlement Control Message, and after with described control word the program stream of described program being carried out descrambling, the program media stream that intercepts out a period of time length is for described user's preview.
Further, said method also can have following feature:
Carry the preview time limit in the described authorization message;
The program media stream that described terminal intercepts out a period of time length is meant for described user's preview: described terminal intercepts out one section according to the value in described preview time limit from described program media stream, the time period length of this section program media stream is smaller or equal to the value in described preview time limit.
Further, said method also can have following feature:
The value in described preview time limit is that described network equipment is determined to draw according to the described preview request that receives.
Further, said method also can have following feature:
The business cipher key that described network equipment is handed down to described terminal is the occasional service key that described network equipment generates according to the described preview request message that receives;
Finish the preview of described program as described user after, described business cipher key cancels.
Further, said method also can have following feature:
Also carry described user's user totem information in the described preview request message;
Described network equipment is verified described user according to the described user totem information that wherein carries earlier, and carry out follow-up flow process again after checking is passed through after receiving described preview request message.
After adopting method of the present invention, Mobile Multimedia Broadcasting operator need not prior making, storage and a large amount of previewing programs fragment of issue in broadcast channel, because the user can directly use program media stream to carry out preview, therefore save bandwidth resources greatly, and alleviated the burden of network equipment.
Description of drawings
Fig. 1 is the structure chart of mobile multimedia broadcast conditional receiving system in the prior art;
Fig. 2 is the flow chart of method for previewing programs in the embodiment of the invention;
Fig. 3 is the block diagram of system of previewing programs in the mobile multimedia broadcast system in the embodiment of the invention;
Fig. 4 is the method flow diagram of previewing programs in the mobile multimedia broadcast system in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
The terminal of previewing program in the mobile multimedia broadcast system comprises communication module, conditional access terminal subsystem and playing module.
Conditional access terminal subsystem is used for sending preview request by above-mentioned communication module to network equipment when the user will initiate the preview of certain program of electron service instruction that terminal is received; Also be used for receive that network equipment returns this program is carried out the authorization message of preview after, in the program media stream of this program, intercept out one section according to this authorization message;
Playing module is used for playing the above-mentioned program media stream that intercepts out to, user.
And the system of previewing program in the mobile multimedia broadcast system except that comprising above-mentioned terminal, also comprises network equipment.Wherein, the effect of each module and comprises condition receiving front-end subsystem as mentioned above in the terminal in the network equipment, and this condition receiving front-end subsystem is used for issuing above-mentioned authorization message according to the preview request that receives to conditional access terminal subsystem.
As shown in Figure 2, the basic design of the inventive method is: during the preview of certain program, terminal sends preview request to network equipment in the electron service instruction that the user will initiate terminal is received; Receive that network equipment returns this program is carried out the authorization message of preview after, in the program media stream of this program, intercept out one section according to this authorization message, show user's preview.Wherein, but the time of user's previewing program stream can be configured in end side or issue by network side.
Specifically can may further comprise the steps:
1.1) after the user uses the mobile multi-media broadcast terminal with two-way return path to receive electron service instruction, if select its program of not ordering of preview, then the conditional access terminal subsystem in this terminal sends the preview request message of the program identification of the user ID of carrying this user and this program by above-mentioned two-way return path to the condition receiving front-end subsystem of Mobile Multimedia Broadcasting operator, and request is carried out preview to this program;
Wherein, two-way return path refers to the channel that has the uplink and downlink communication ability between terminal and network equipment, it can be wireless channel, it also can be wire message way, it is responsible for preview request message is transparent in the condition receiving front-end subsystem of mobile multimedia operator, need not preview request message is handled;
1.2) after condition receiving front-end subsystem receives preview request message, according to the user ID of wherein carrying user identity is verified, confirming whether this user is validated user and whether has the right to carry out preview, and checking by after the preview time limit of this program correspondence and the SEK that temporarily is used for this previewing programs of generation are sent to terminal by two-way return path.And send mode can be and sends to terminal after being encapsulated in interim SEK and preview time limit in the EMM message together.
Wherein, the value in the preview time limit of this program correspondence can be pre-configured and be kept at the system equipment side, or determine to obtain according to the attribute information of attribute of user information and this program by condition receiving front-end subsystem, and customer attribute information includes but not limited to comprise any one or its combination in any in credit that user's order behavior in the past produces, user's grade, user's the information such as account balance; Program attribute information includes but not limited to comprise any one or its combination in any in the information such as ageing, subscription fee of grade, programme content of this program.
Mobile Multimedia Broadcasting operator can determine definite strategy of own preview time limit of being adopted according to the operation strategy of oneself when reality is runed, as: Mobile Multimedia Broadcasting operator can set up corresponding fractional value to each subitem of customer attribute information and program attribute information, and sets up preview authority scores computing formula and the preview time limit corresponding with each preview authority scores.According to this formula, after each subitem fractional value is weighted and calculates, can obtain a preview authority scores, can further determine the corresponding preview time limit according to this mark then.
And, definite strategy of limit value when Mobile Multimedia Broadcasting operator can also change oneself preview when needed, as: each subitem that is comprised in increase and decrease customer attribute information and the program attribute information, the fractional value that changes each subitem correspondence, change preview authority scores computing formula, change the preview time limit of preview authority scores correspondence etc.All all can be decided according to actual conditions by Mobile Multimedia Broadcasting operator.
Condition receiving front-end subsystem is except that sending interim SEK and the preview time limit, can also issue preview mode information to the user to user terminal, this preview mode can be in following three kinds any one:
Mode one, user can only preview once, the time can not surpass T0;
Mode two, user can carry out n preview in time T, each preview time can not surpass T0;
Mode three, user can carry out n preview in time T, preview total time can not surpass T.
Wherein, which kind of preview mode is terminal specifically adopt also can obtain according to the mode of above-mentioned fractional value correspondence.
1.3) EAM-C in the terminal uses the interim SEK that receives that the ECM of this program correspondence of getting access to is decrypted, CW is to descrambling module in output; And set up the previewing programs clock and pick up counting, overtime thresholding is the previewing programs time limit that receives;
When EAM-C picked up counting, the time started of all right minute book time program preview was in order to being uploaded to condition receiving front-end subsystem.
1.4) the descrambling module program stream that uses CW to treat preview carries out descrambling, and export the program stream behind the descrambling to player, watch for the user; In addition, terminal can also be stored the program stream that descrambling goes out, and treats that previewing programs finishes the back and repeats to watch for the user;
1.5) when user's viewing time reaches the thresholding in limited time of previewing programs clock or user and initiatively withdraws from this previewing programs, EAM-C stops the deciphering to the ECM of this program, interim SEK cancels, preview finishes, and terminal can be noted the time that the user finishes preview, in order to being uploaded to condition receiving front-end subsystem.
In addition, the EAM-C various information that can also the user be write down in the previewing programs process by the two-way return path of terminal are passed the condition receiving front-end subsystem of Mobile Multimedia Broadcasting operator back.
Above-mentioned customer attribute information can be formed and stored in the network equipment by Mobile Multimedia Broadcasting operator when the user opens an account, network equipment can dynamically update the operating position of business according to the user, and regularly this customer attribute information is issued counterpart terminal so that terminal is stored and upgraded.Simultaneously, terminal also can be upgraded being stored in local customer attribute information according to user's operating position, and can be uploaded to network equipment with the customer attribute information that network equipment carries out this locality being preserved when mutual in terminal.In order to ensure information security, no matter this customer attribute information leaves on the network equipment or leaves on the terminal, all needs encrypted protection.
Further be illustrated with an application example of the present invention below.
In the present embodiment, terminal has following feature, as shown in Figure 3:
Terminal A has mobile communication function, is GSM (global system for mobile communications) mobile phone that networks in China Mobile, built-in mobile communication module B, Mobile Multimedia Broadcasting receiver module C, sound module G, display module H and player I.Wherein, Mobile Multimedia Broadcasting receiver module C is made up of conditional access terminal subsystem module D, demodulation/demultiplexing module E and radio-frequency module F, conditional access terminal subsystem module D is made up of EAM-C firmware module, EPM-C firmware module and descrambling module, EAM-C firmware module and EPM-C firmware module can be encapsulated in the MicroSD card (miniature safe digital card), link to each other with terminal A by SDIO (secure digital input and output) interface.
Mobile Multimedia Broadcasting operator sets up the user credit grade respectively according to each user's situation, is divided into 1～5 grade, and numeral is big more, and the expression credit grade is high more.
In the present embodiment, certain user uses terminal A to watch Mobile Multimedia Broadcasting, enters electron service instruction, has selected a program of not ordering to carry out preview.This user credit grade is 3.As shown in Figure 4, preview process may further comprise the steps:
Step 401: the user enters electron service instruction, selects a TV play program of not ordering, and clicks " preview " menu;
Step 402: terminal A receives user's instruction, and notification condition receiving terminal subsystem D carries out previewing programs;
Step 403: conditional access terminal subsystem D sends solicitation message by mobile communication module B to the condition receiving front-end subsystem of Mobile Multimedia Broadcasting operator, with request this program is carried out preview.This message is encapsulated in the note and transmits, and wherein comprises user ID and program identification;
Step 404: after condition receiving front-end subsystem is received solicitation message, user identity is verified, the checking by after obtain customer attribute information and program attribute information, find that this user credit grade is 3, this program is the TV play of a replay.Condition receiving front-end subsystem is according to these information, determine this user can only this program of preview once, and be limited to 2 minutes during preview;
Step 405: condition receiving front-end subsystem generates an interim SEK who is used for this previewing programs, is encapsulated in the EMM message with the previewing programs time limit, and EMM message is encapsulated in the note, by two-way return path this note is sent to terminal A;
Step 406: terminal A receives this EMM message, is solved interim SEK and the 2 minutes previewing programs time limits that wherein comprises by EAM-C;
Step 407:EAM-C obtains the ECM of this program correspondence and uses interim SEK that described ECM is decrypted, and CW is to descrambling module in output; Simultaneously, EAM-C sets up the previewing programs clock and picks up counting, and the overtime thresholding of clock is 2 minutes;
Step 408: descrambling module uses CW that this program is carried out descrambling, and exports the program stream behind the descrambling to player I, watches for the user;
Step 409: the previewing programs clock timing arrives 2 minutes, and EAM-C stops ECM to this program and is decrypted and cancels the previewing programs clock, and interim SEK cancels, and player I no longer plays this program, and preview finishes;
Step 410:EAM-C writes down the time that this preview finishes.
In another embodiment of the present invention, EAM-C firmware module and EPM-C firmware module are encapsulated in an external USB (USB) module, link to each other with terminal by USB interface.
In another embodiment of the present invention, the mobile communication function of terminal can be followed TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) standard, or CDMA2000 (Code Division Multiple Access2000, CDMA 2000) standard.
In another embodiment of the present invention, after previewing programs finished, EAM-C can be back to user's program preview information the network equipment of Mobile Multimedia Broadcasting operator by the return path of terminal.
In another embodiment of the present invention, can use multimedia message to transmit the various message relevant between the network equipment of terminal and operator with previewing programs.
In another embodiment of the present invention, can directly set up IP between the network equipment of terminal and operator and be connected, transmit the various message relevant with previewing programs.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as 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 (15)
1. the terminal of previewing program in the mobile multimedia broadcast system comprises communication module, conditional access terminal subsystem and playing module, it is characterized in that,
Described conditional access terminal subsystem is used for sending preview request by described communication module to network equipment when the user initiates preview to certain program of electron service instruction; Also be used for receive that described network equipment returns this program is carried out the authorization message of preview after, in the program media stream of described program, intercept out one section according to described authorization message; Carry the program corresponding service key and/or the preview time limit of asking preview with described user in the described authorization message;
Described playing module is used for playing the described program media stream that intercepts out to described user.
2. terminal as claimed in claim 1 is characterized in that,
Carry the identification information that described user asks the program of preview in the described preview request;
Carry business cipher key in the described authorization message, then corresponding to described identification information
Described conditional access terminal subsystem utilizes described business cipher key to decrypt control word from Entitlement Control Message, and after with described control word the program stream of described program being carried out descrambling, intercepts out the program media stream of a period of time length.
3. terminal as claimed in claim 1 or 2 is characterized in that,
Carry the corresponding preview time limit of program of asking preview with described user in the described authorization message, then described conditional access terminal subsystem intercepts out one section according to the value in described preview time limit from described program media stream, the time period length of this section program media stream is smaller or equal to the value in described preview time limit.
4. the system of previewing program in the mobile multimedia broadcast system comprises terminal and network equipment, comprises condition receiving front-end subsystem in the described network equipment; Comprise communication module, conditional access terminal subsystem and playing module in the described terminal, it is characterized in that,
Described conditional access terminal subsystem is used for sending preview request by described communication module to described condition receiving front-end subsystem when the user will initiate the preview of certain program of electron service instruction that terminal is received; Also be used for receive that described condition receiving front-end subsystem returns this program is carried out the authorization message of preview after, in the program media stream of described program, intercept out one section according to described authorization message; Carry the program corresponding service key and/or the preview time limit of asking preview with described user in the described authorization message;
Described condition receiving front-end subsystem is used for issuing described authorization message according to the described preview request that receives to described conditional access terminal subsystem;
Described playing module is used for playing the described program media stream that intercepts out to described user.
5. system as claimed in claim 4 is characterized in that,
Carry the identification information that described user asks the program of preview in the described preview request;
Carry in the described authorization message that described condition receiving front-end subsystem issues and described identification information corresponding service key;
Described conditional access terminal subsystem utilizes described business cipher key to decrypt control word from Entitlement Control Message, and after with described control word the program stream of described program being carried out descrambling, intercepts out the program media stream of a period of time length.
6. as claim 4 or 5 described systems, it is characterized in that,
Carry the corresponding preview time limit of program of asking preview with described user in the described authorization message, then described conditional access terminal subsystem intercepts out one section according to the value in described preview time limit from described program media stream, the time period length of this section program media stream is smaller or equal to the value in described preview time limit.
7. system as claimed in claim 6 is characterized in that,
Described condition receiving front-end subsystem also is used for determining to draw the described preview time limit according to the described preview request that receives.
8. system as claimed in claim 5 is characterized in that,
The business cipher key that is handed down to described terminal is the occasional service key that described condition receiving front-end subsystem generates according to the described preview request that receives;
After described user finished previewing programs, described business cipher key cancelled.
9. as claim 5 or 7 or 8 described systems, it is characterized in that,
The user totem information that also comprises described user in the described preview request;
Described condition receiving front-end subsystem also is used for after receiving described preview request, according to the described user totem information that wherein carries described user is verified earlier.
10. the method for previewing program in the mobile multimedia broadcast system is characterized in that, comprising:
During the preview of certain program, described terminal sends preview request to network equipment in the electron service instruction that the user will initiate terminal is received; Receive that described network equipment returns this program is carried out the authorization message of preview after, in the program media stream of described program, intercept out one section according to described authorization message, show described user's preview; Carry the program corresponding service key and/or the preview time limit of asking preview with described user in the described authorization message.
11. method as claimed in claim 10 is characterized in that,
Carry the identification information that described user asks the program of preview in the described preview request;
Described network equipment carries in the described authorization message that described terminal is returned and described identification information corresponding service key;
Described terminal intercepts out one section according to described authorization message in the program media stream of described program, show described user's preview to be meant: described terminal utilizes described business cipher key to decrypt control word from Entitlement Control Message, and after with described control word the program stream of described program being carried out descrambling, the program media stream that intercepts out a period of time length is for described user's preview.
12. method as claimed in claim 10 is characterized in that,
Described network equipment carries the corresponding preview time limit of program of asking preview with described user in the described authorization message that described terminal is returned, then
The program media stream that described terminal intercepts out a period of time length is meant for described user's preview: described terminal intercepts out one section according to the value in described preview time limit from described program media stream, the time period length of this section program media stream is smaller or equal to the value in described preview time limit.
13. method as claimed in claim 12 is characterized in that,
The value in described preview time limit is that described network equipment is determined to draw according to the described preview request that receives.
14. method as claimed in claim 11 is characterized in that,
The business cipher key that described network equipment is handed down to described terminal is the occasional service key that described network equipment generates according to the described preview request that receives;
Finish the preview of described program as described user after, described business cipher key cancels.
15. as claim 10 or 11 or 13 or 14 described methods, it is characterized in that,
Also carry described user's user totem information in the described preview request;
Described network equipment is verified described user according to the described user totem information that wherein carries earlier, and carry out follow-up flow process again after checking is passed through after receiving described preview request.
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| CN102170592B (en) * | 2011-05-10 | 2013-11-06 | 深圳创维数字技术股份有限公司 | Program previewing method and system based on digital television |
| CN103064861A (en) * | 2011-10-21 | 2013-04-24 | 联想(北京)有限公司 | Method and device for previewing media files and electronic devices |
| TWI616833B (en) * | 2013-03-21 | 2018-03-01 | 緯創資通股份有限公司 | Method for media guiding and playing, device, and computer readable media thereof |
| CN105592328A (en) * | 2014-10-24 | 2016-05-18 | 中兴通讯股份有限公司 | Information processing method, EPG server, and client |
| KR102039995B1 (en) * | 2018-03-29 | 2019-11-04 | 라인플러스 주식회사 | Method and system for providnig efficient multimedia message depending on user context information in messenger service |
| CN109446823A (en) * | 2018-09-30 | 2019-03-08 | 天津字节跳动科技有限公司 | Preview file method, apparatus, electronic equipment and readable storage medium storing program for executing |
| CN111083566B (en) * | 2018-10-19 | 2021-06-22 | 华为技术有限公司 | Audio and video preview content playing method and device and storage medium |
| CN112312171A (en) * | 2020-09-30 | 2021-02-02 | 广西广播电视信息网络股份有限公司 | System and method for realizing digital television program preview function |
-
2008
- 2008-12-24 CN CN200810188174XA patent/CN101442664B/en not_active Expired - Fee Related
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| CN101442664A (en) | 2009-05-27 |
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