CN101047956B - Multimedia broadcast service system and method - Google Patents

Multimedia broadcast service system and method Download PDF

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Publication number
CN101047956B
CN101047956B CN2006100663734A CN200610066373A CN101047956B CN 101047956 B CN101047956 B CN 101047956B CN 2006100663734 A CN2006100663734 A CN 2006100663734A CN 200610066373 A CN200610066373 A CN 200610066373A CN 101047956 B CN101047956 B CN 101047956B
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user
broadcast
msk
multicast service
key
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CN101047956A (en
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汪世乐
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2006100663734A priority Critical patent/CN101047956B/en
Priority to PCT/CN2007/000760 priority patent/WO2007112650A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computer Security & Cryptography (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)
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Abstract

This invention discloses a multimedia broadcast method and a system, which can control access of users and transmission of content effectively, in which, the method includes: a user orders multimedia broadcast service, a broadcast multicast service center gets the order information to provide a deciphering key to the user terminal ordering the service and encrypts broadcast data flow and plays, then the user terminal utilizes the deciphering key to deciphere the received data flow.

Description

A kind of multimedia broadcast service system and method
Technical field
The present invention relates to the multimedia broadcasting and multicast technology, particularly relate to a kind of multimedia broadcast service system and method.
Background technology
See also Fig. 1, in the mobile network, for supporting multimedia broadcast-multicast service (MBMS, Multimedia Broadcast Multicast Service), newly-increased broadcast multicast service center (BM-SC, Broadcast Multicast Service Center).And, Gateway GPRS Support Node (GGSN, Gateway GPRS Support Node), Serving GPRS Support Node (SGSN, Serving GPRSSupport Node), 3G Radio Access Network (UTRAN, UMTS Terrestrial Radio AccessNetwork) and subscriber equipment (UE, User Equipment) also increase function corresponding respectively.
Wherein, the border of MBMS carrying service is Gmb and Gi reference point, and the service of chain of command and user's face is provided respectively.By the Gmb reference point, the signaling of being correlated with between GGSN and the BM-SC mutual: the foundation of MBMS bearer context, release; Notice GGSN is about the beginning of MBMS session and stop, and professional network service quality (QoS, Quality of Service) parameter etc.
BM-SC is the core of MBMS system, and realization providing and controlling the MBMS business, realizes mobile terminal access control and charging when multicast service.Specifically, BM-SC is the inlet of content supplier (CP, Content Provider), be used for authorizing and in mobile network, initiate the MBMS bearer service, and scheduling and transmit the MBMS content.Its function comprises: (1) is to authentication, mandate and the charging of third party content supplier; (2) provide MBMS transmission relevant parameter configuration feature, as: QoS, multicast and broadcast zone, initiation and termination MBMS transfer resource etc.; (3) receive and transmit the MBMS content from CP/SP (Service Provider, service provider), scheduling MBMS session transmits and notifies user, session re-transmission etc.; (4) service statement comprises media description, conversation description such as multicast service identifier, address, delivery time etc.
See also Fig. 2, BM-SC comprises: member management unit, session and transmission unit, agency and retransmission unit, professional announcement unit and safe unit.
Wherein, the member management unit is mainly used in management service user's order relations, uses business to carry out authentication to the user, provides the order relations data to use to other unit.
Session and transmission unit are mainly finished the scheduling of MBMS session, can dispatch the re-transmission of MBMS session.In order to make UE can distinguish the re-transmission of MBMS session, session and transmission unit are stamped session identification for each MBMS session, and TMGI (Temporary Mobile Group Identity, the interim group ID that moves) is distributed by session and transmission unit.Each transmission of MBMS session and follow-up repeating transmission all are to identify by public MBMS session identification (2-3Octets), arrive application layer by delivery of content, simultaneously by beginning to send in the request message radio network controller (RNC, Radio Network Controller) in the MBMS session with brief form (i.e. Zui Xiao important eight tuples).
Session provides transmission relevant parameter with transmission unit to GGSN, as QoS, MBMS service area; Can also apply for or discharge the MBMS bearing resource and be used for the transmission of broadcast data; Can also use favourable fault tolerant mechanism, as the integrality that adopts special-purpose MBMS coding or forward error correction mechanism to guarantee the transmission data.Session and transmission unit need the data input part part carries out access authentication, and the content-data that can obtain to export to outside (as: Streaming Media, multimedia short message etc.).
To be data issue the intermediate equipment of GGSN by session and delivery unit for agency and transmission unit, can be divided into agent unit (processing controls plane signaling (Gmb)) and transmission unit (managing multicast load).That is to say that agency and transmission unit are the agencies of Gmb reference point signaling between GGSN and other BM-SC unit (member management unit, session and the transmission unit).When the BM-SC unit of handling different MBMS business was provided by different physical NEs, agency and transmission unit provided the signalling route function, are transparent to GGSN.Agency and transmission unit can produce the station message recording for CP/SP, and CP/SP begins signaling by the Gmb interface by session and offers agency and transmission unit.
Professional announcement unit provides the service distribution function for multicast and broadcasting MBMS customer service, the media specifier (as: audio frequency and video form and coding etc.) of the MBMS business that will issue can be provided for UE by media description, the session specification (as multicast service sign, addressing, reproduction time etc.) of the MBMS business that will issue can be provided for UE by conversation description.Professional announcement unit is utilized the agreement distribution media and the conversation description of the Internet engineering duty group (IETF, The Internet Engineering Task Force) appointment.
The transmission of professional declaration is triggered by BM-SC, but can finish transmission by other external component.For example, bearing capacity, WAP PUSH (WAP Push), URL (Uniform ResourceLocation by MBMS, URL(uniform resource locator)), declaration Location such as SMS (point-to-point short message) and SMS Cell Broadcast CB, URL(uniform resource locator)), SMS (point-to-point short message) and SMS Cell Broadcast CB etc. declare the MBMS customer service.
Safe unit is mainly used in integrality and the confidentiality that guarantees the MBMS broadcast data.Safety function comprises the distribution of MBMS key and terminal use's authentication functions.
In the prior art, MBMS broadcasting service user is when activating (Activation) and deexcitation (De-activation) business, only need to finish in the UE operation, whole process is not mutual with network not, also do not create the context (MBMS UEContexts) of communication on SGSN, GGSN and UE.Therefore, BM-SC can only begin and information output tickets such as the data volume of conversation end, transmission, CP/SP title according to session, and submits to the operation charge system that CP/SP is chargeed ticket.
That is to say, only provided the suggestion that CP/SP is chargeed for broadcasting service in the MBMS agreement at present, the scheme and the suggestion that do not have couple user to charge.But, consider the practical business operation, if only CP/SP is chargeed, then the context of MBMS business will be limited to propaganda or commercial paper content etc.This be because,, Stock Market Analysis live for mobile TV, horse racing etc. are to the attractive content of user, if operator can not charge to the user by the MBMS broadcasting service, will restriction operator to the popularization of this type of content.Therefore, the MBMS broadcasting service can not be carried out authenticating and charging to the user and can not be satisfied that Operator Specific Service is promoted and the operation requirement.
In a word, the defective of prior art is, owing in broadcasting process, do not utilize user's relevant information to come user's the access and the transmission of content are effectively controlled, and reasonably charge, make partial service successfully not carry out, thereby cause resource waste.
Summary of the invention
The technical problem that the present invention solves provides a kind of multimedia broadcast service system and method, can effectively control user's the access and the transmission of content.
For this reason, the technical scheme of technical solution problem of the present invention is: a kind of media broadcasting method is provided, comprises step:
The user orders multi-media broadcasting service;
When user's order/cancellation broadcasting service, the operation charge system arrives broadcast multicast service center with information synchronization; When user's cancellation, operation charge system notification broadcast multicast service center finish cancellation handle, when user's number of changing, operation charge system notification broadcast multicast service center finishes that the number of changing is handled and/or when collecting the customer charge failure, operation charge system notification broadcast multicast service center order cancellation relation, termination user's rights of using;
Broadcast multicast service center is carried out the hash grouping according to Subscriber Number to the user, and one group of user uses same multimedia broadcast-multicast service service key MSK;
Broadcast multicast service center issues MSK and arrives the user's of subscribed broadcast business user terminal according to user's ordering information; If perhaps user terminal finds that in broadcasting service when declaration of receiving encryption no MSK or MSK are expired, initiatively arrive broadcast multicast service center application or renewal;
The operation charge system is chargeed according to the user of described user's ordering information to subscribed broadcast business;
Described broadcast multicast service center broadcast encryption data flow and broadcasting;
User terminal utilizes decruption key that the broadcast data stream that receives is decrypted.
Preferably, described user orders multi-media broadcasting service and comprises that the user orders multi-media broadcasting service on the foreground, business hall or by portal website of operator to the operation charge system.
Preferably, described broadcast multicast service center broadcast encryption data flow is meant and adopts multimedia broadcast-multicast service transmission security key MTK secure service data when business datum issues, also comprise the MIKEY packet of the MTK that encrypted with MSK in the data flow of broadcasting.
Preferably, described user terminal utilizes aforementioned decruption key that the broadcast data stream that receives is decrypted to comprise: the MSK that the user terminal utilization obtains, the MTK enciphered data that receives is decrypted, obtains MTK, and utilize MTK that broadcast data stream is decrypted.
Preferably, also comprise: when issuing MSK,,, and be saved in user terminal then by user terminal application MUK if there is not multimedia broadcast-multicast service user key MUK on the user terminal to user terminal.
Preferably, comprise that also broadcast multicast service center regular update MSK is to user terminal.
Preferably, comprise that also broadcast multicast service center is upgraded User Status, and issues invalid MSK to user terminal, stops user's use for the user of order cancellation or fee failure; If issue failure, then retry is expired to the original MSK term of validity always.
The present invention also provides a kind of multimedia broadcast service system, comprising:
The operation charge system is used to receive user's ordering information and is sent to broadcast multicast service center;
Broadcast multicast service center is used for issuing the MSK decruption key to the user of current subscribed broadcast business, encrypts MTK with MSK, and with MTK broadcast encryption data flow and broadcast;
User terminal is used for receiving and deciphering key and broadcast data stream, and utilizes MSK decruption key deciphering MTK information, and utilizes the MTK decruption key that broadcast data stream is decrypted
User's ordering information processing unit, be used for receiving from user's data, when user's order/cancellation broadcasting service, information synchronization is arrived broadcast multicast service center, when user's cancellation, the notification broadcast multicast service center finish cancellation handle, when user's number of changing, operation charge system notification broadcast multicast service center finishes the number of changing processing and/or when collecting the customer charge failure, the order cancellation of notification broadcast multicast service center concerns, stops user's rights of using;
User's Charging Detail Record unit is used for finishing according to the order relations of user's broadcasting service and charges and the function that keeps accounts;
Described broadcast multicast service center comprises: the key generation unit is used for generating key according to the key generation strategy of broadcasting service; Described key generation strategy is according to Subscriber Number the user to be carried out the hash grouping, and one group of user uses same MSK; Cipher key distribution unit is used for sending key according to the key distribution strategy of broadcasting service to the user's of subscribed broadcast business user terminal.
With respect to prior art, the invention has the beneficial effects as follows: because system and method for the present invention makes full use of the subscription data that the user orders multi-media broadcasting service, terminal to the user of current subscribed broadcast business provides key, and the multimedia data stream to broadcasting is encrypted, make and to have only that the user of subscribed broadcast business can be decrypted the broadcast data stream of encrypting, the user of Ding Gouing is not then owing to obtain key, therefore can't the broadcast data stream of encrypting be decrypted, thereby realize the not restriction of subscribed users, realization is effectively controlled user's the access and the transmission of content, therefore make operator can promote plurality of kinds of contents, make full use of system resource.
In preferred version of the present invention, can further provide the function of the user being carried out authentication and charging at multi-media broadcasting service., Stock Market Analysis live for mobile TV, horse racing etc. is to the attractive content of user, operator can be by the operation of MBMS broadcasting service, can make full use of Internet resources, increase the application scenarios of MBMS broadcasting service, help the use and the popularization of MBMS broadcasting service.
Description of drawings
Fig. 1 is a schematic diagram of supporting the mobile network of MBMS business;
Fig. 2 is the structured flowchart of BM-SC shown in Figure 1;
Fig. 3 is the block diagram of MBMS of the present invention system;
Fig. 4 is the flow chart of media broadcasting method of the present invention;
Fig. 5 is the block diagram of an embodiment of multi-media broadcasting system of the present invention.
Embodiment
Consider that the MBMS agreement is included as the related protocol 3GPP TS33.246 that multicast service provides security control, the present invention is based on broadcast service system framework in the MBMS agreement, in conjunction with in the agreement to the security control function of multicast service, by strengthening user management (Membership) function of BM-SC, cooperate control and the billing function of finishing the MBMS broadcasting service with the operation charge system.
Seeing also Fig. 3, is the block diagram of MBMS of the present invention system.
In the MBMS system, Content Management Platform (CMS) 310 is used for the Promgramming and the Content Management of MBMS broadcasting, comprises the management of contents such as Streaming Media, download, multimedia message.To streaming medium content, Content Management Platform 310 is notification streams media system 320 simultaneously, so that stream media system 320 issues Media Stream on time.
Database 330 is used to store system data, user's order relations data of BM-SC 300 needs, and the relevant data of broadcasting service.
Operation charge system 340 is finished user management, service order and billing function.The user is when ordering the MBMS business, and operation charge system 340 is by SMAP interface (intra-company's interface) notice BM-SC300.Also pass through SMAP notice of settlement BM-SC 300 when user's number of changing, cancellation, order relations change.
Bill record collection system 350 collects business service service recorders (CDR, Call DetailRecord) from BM-SC 300 and charges or add up for operation charge system 340.
Stream media system 320 is play clean culture according to listing and is flow to BM-SC 300, or accepts BM-SC 300 requests, issues given content stream.
360 couples of BM-SC of united net management system 300 carry out webmaster, down distributing configuration data etc.
Short message service center/Cell Broadcast CB 370 is by short message or the declaration of Cell Broadcast CB issuing service.
Push Proxy Gateway (PPG, Push Proxy Gateway) 380 is by the declaration of Wap Push issuing service.
BM-SC 300 is as MBMS service management and control centre, receive PSS (Packet ServiceSubsystem, Packet Service Subsystem) RTP (Real-time Transport Protocol, RTP) stream, convert unicast stream to broadcasting stream, be issued to GGSN 390; Be connected with Content Management Platform 310, operation charge system 340, finish management functions such as service-user, business tine, customer service order; Also be connected simultaneously and finish professional declaration function with Push Proxy Gateway 380, short message service center/Cell Broadcast CB 370 etc.; And directly and 400 of UE finish issuing of business cipher key by HTTP/MIKEY.To the Operation and Maintenance of system, BM-SC also needs to set up interface with united net management system 360, accepts the management of united net management system 360 for convenience.
In addition, professional declaration can issue by the mode beyond short message, WAP PUSH and the MBMS carrying, may increase the interface of BM-SC 300 and corresponding external component.For the content of input, BM-SC 300 also can obtain MMS content by being connected with the MM7 interface with MMS (MMS center).
See also table 1, the interface between the BM-SC and peripheral function entity in the MBMS system is shown.
Interface between table 1BM-SC and the peripheral function entity
Interface number Interface protocol Communication modes Interface is described
(1) Internal agreement TCP/IP With the Content Management Platform interface, Content Management Platform need be with content relevant parameter or listing notice BM-SC when organize content
(2) SQLAPI (internal agreement) TCP/IP With the interface of database, adopt SQLAPI to reduce the dependence of system to database, can support Database Systems such as Oracle, DB2, Infbrmix simultaneously
(3) SMAP (internal agreement) TCP/IP With operation charge system interface, be used for functions such as service order, order cancellation, cancellation, the number of changing, and the service authentication function.
(4) FTP TCP/IP With the bill record collection system interface, the bill record collection system gets the operation charge system with the BM-SC ticket
(5) RTP/HTTP TCP/IP With the stream media system interface, accept unicast stream that stream media system issues or BM-SC issue appointed program to the stream media system request stream
(6) SNMPV3 TCP/IP With the united net management system interface, accept united net management service system management function, to united net management system report and alarm and statistical information
(7) Gmb/Gi TCP/IP With the GGSN interface, issue broadcasting stream.Carry out the maintenance of MBMS communication
(8) HTTP/MIKEY TCP/UDP With the UE interface, be mainly used in Key issue or ask upgrade
(9) PAP TCP/IP With Push Proxy Gateway (PPG) interface, accept BM-SC and carry out business declaration as PI (Push Initiator) and issue
(10) SMPP 3.4 TCP/IP With short message service center/Cell Broadcast CB (SMS-CB) interface, accept
[0063]
? ? ? BM-SC carries out the business declaration as SP and issues
Multi-media broadcasting system of the present invention is when work, and operation charge system 340 receives user's ordering information and is sent to BM-SC 300, according to the charging of described ordering information realization to the user;
BM-SC 300 issues decruption key to the user of subscribed broadcast business, and the broadcast encryption data flow is also broadcasted;
UE 400 receiving and deciphering key and broadcast data streams, and utilize decruption key that broadcast data stream is decrypted.
Wherein, the user can order the MBMS business by operation charge system 340 in the business hall, also can order the MBMS business by Portal (providing the Provisioning interface to use to Portal by the operation charge system).Operation charge system 340 can be synchronized to BM-SC 300 to subscription data.
Order cancellation process and subscription procedure are similar, and BM-SC 300 upgrades the MSK on the UE400, cancellation user's rights of using when the order cancellation success.
User's cancellation/the number of changing, operation charge system 340 notice BM-SC 300 finish cancellation and the number of changing is handled.
The key that BM-SC 300 handles comprises MUK, MSK and MTK.MUK is a user key; MSK is a group key, the shared one group of MSK key of all users, and the quantity of MSK determines that according to the number of users of broadcasting service concrete quantitative requirement can dispose (suggestion value 128); MTK is a group key, and the shared one group of MTK key of all users is specified the concrete MTK ID that uses in each broadcasting service stream.
BM-SC distributes MSK to the UE 400 that orders the MBMS broadcasting service regularly according to the distribution policy of MSK 300 every days, and preserves data in the database 330 of system.
When UE 400 applications or initiation MSK renewal, BM-SC 300 can correctly issue MSK to UE according to user's order relations data of preserving in the database 330.
BM-SC 300 can use the Media Stream that issues MTK to encrypt again and issue.
For pre-payment or postpaid service user, operation charge system 340 is finished monthly payment according to the order relations of user's MBMS broadcasting service and is chargeed and the function of deducting fees, operation charge system 340 is when collecting the failure of user's exclusive monthly fee, need notice BM-SC 300 order cancellations relation, stop user's rights of using.
With reference to 3GPP TS 33.246 agreements, UE 400 is before request MSK or when receiving the MSK updating message of BM-SC 300, to Bootstrap service entities BSF (figure does not show) application MUK, be kept among UE 630 or the UICC (not indicating), preserving type need be notified BM-SC 300.
UE 400 can be according to 3GPP TS 33.246 agreements, and is expired or initiate request application MSK to BM-SC 300 when not having MSK at MSK, and the MSK enciphered data of using the MUK deciphering to return, generates MBMS request key (MRK, MBMS Request Key) during request.Also can correctly handle for the MSK update request that BM-SC 300 initiatively issues according to agreement.
Described MRK is used at UE 400 differentiating that MRK can derive MUK as parameter when BM-SC 300 applies for MSK.
UE 400 can also be according to 3GPP TS 33.246 agreements, and is expired or wait for that BM-SC 300 initiates MTK and upgrades when not having MTK at MTK, and uses MSK deciphering MTK enciphered data, obtains MTK.
UE 400 can use the MBMS broadcast service data of the encryption that the correct treatments B M-SC 300 of MTK issues.
Seeing also Fig. 4, is the flow chart of media broadcasting method of the present invention.
Step S410, user order the MBMS broadcasting service;
Step S420, BM-SC obtain user's ordering information; Issue decruption key to the user's of subscribed broadcast business terminal;
Wherein, described key is MBMS service key (MSK, MBMS Service Key).
Step S430, BM-SC broadcast encryption data flow and broadcasting;
Wherein, the encryption of broadcast data stream adopts MBMS Traffic Key (MTK, MBMS Traffic Key) to realize.In addition, the MIKEY packet that also comprises the MTK that encrypted with MSK in the data flow of broadcasting.
Step S440, user terminal utilize aforementioned decruption key that the broadcast data stream that receives is decrypted.
Described deciphering comprises the MSK that the user terminal utilization obtains, and the MTK data that receive are decrypted, and obtains MTK, and utilizes MTK that broadcast data stream is decrypted.
In addition, comprise that also runing charge system collects the charges to the user who has ordered according to user's ordering information.
For ease of understanding the present invention, media broadcasting method of the present invention is elaborated below in conjunction with specific embodiment.
At first, the user orders the MBMS broadcasting service to the operation charge system.
The user can order the MBMS broadcasting service on the foreground, business hall or by portal website of operator (Portal).Specifically, the user can order the MBMS business by the operation charge system in the business hall, also can order the MBMS business by Portal (providing the Provisioning interface to use to Portal by the operation charge system).
Subsequently, the operation charge system sends to BM-SC with subscription data.
The operation charge system generates ordering information according to user's subscription procedure, and user's ordering information is synchronized to BM-SC, and notice order business or order relations upgrade.
Subsequently, BM-SC issues the MBMS service key and arrives the user's of subscribed broadcast business UE according to user's order relations data.
Described MBMS service key is used for issuing process at MBMS Traffic Key, encrypts MTK.
Described MTK is used for secure service data when business datum issues.
Because the user's of subscribed broadcast business UE obtains MSK, therefore can the broadcast data stream that BM-SC encrypts be decrypted, the user of Ding Gouing then owing to do not obtain MSK, therefore can't not be decrypted the broadcast data stream that BM-SC encrypts, thereby realizes the not restriction of subscribed users.
In addition, need to prove, when issuing MSK to UE, if there is not MBMS user key (MUK, MBMS User Key) on the UE, then by UE according to 3GPP TS 33.246 agreement application MUK, and be saved in terminal interface (UICC) or UE.
Described MUK is used for the MSK data of point-to-point between BM-SC and UE are encrypted.
In addition, for strengthening control to user's receiving broadcast service, can be by BM-SC regular update MSK to UE.And,, can arrive initiatively that BM-SC applies for or renewal if UE receives that broadcasting service when declaration of encryption find that no MSK or MSK are expired.
On the basis of realization to effective control of user, the operation charge system can be collected user's MBMS broadcasting service expense according to user's ordering information.
Need to prove, consider the agreement according to existing MBMS, for broadcasting service, the user can informing network when reaching the standard grade and roll off the production line, and business network element BM-SC can't obtain the user and use business information.Therefore, can't obtain under the detailed use information state of user, provide regular billing function, for example the monthly payment mode of chargeing at the user by the operation charge system at BM-SC.
For the user of order cancellation or the failure of monthly payment fee, BM-SC upgrades User Status, and issues an invalid MSK to UE, stops user's use; If issue failure, then retry is expired to the original MSK term of validity always.And user's subscription data that the BM-SC periodic cleaning is invalid arrives history library.
Seeing also Fig. 5, is the block diagram of an embodiment of multi-media broadcasting system of the present invention.
Operation charge system 340 comprises user's ordering information processing unit 341 and user's Charging Detail Record unit 342; BM-SC 300 comprises key generation unit 310, cipher key distribution unit 320.
Wherein, user's ordering information processing unit 341 is used for receiving from user's data, when user's order/cancellation broadcasting service, information synchronization is arrived BM-SC 300, notice BM-SC300 finishes cancellation and the number of changing processing when the user's cancellation/number of changing, and notice BM-SC 300 order cancellations relation when collecting the customer charge failure, termination user's rights of using.
User's Charging Detail Record unit 342 is finished according to the order relations of user's MBMS broadcasting service and is chargeed and the function of deducting fees.
Key generation unit 310 is used for generating key according to the key generation strategy of broadcasting service.
The key generation strategy of 3GPP TS 33.246 is mainly used in multicast, and different with broadcasting is that single user in multicast service quantity may not have the broadcasting service number of users big, generates different MSK can for each user; Hold by MBMS at MTK and to cut down when sending out, the data volume of corresponding M IKEY request package is also in the acceptable scope.
And for broadcasting service, number of users only is subject to network capacity, if each user has independently MSK, because MTK issues with MSK and encrypts, so cut down when sending out MTK holding by MBMS, data volume can change along with the difference of number of users, when customer volume is very big, may cause the appearance in the professional playing process interrupted.Therefore the key generation strategy of broadcasting service is that BM-SC 300 carries out the hash grouping according to Subscriber Number to the user, and one group of user uses same MSK.The quantity of user's group can dispose.
Cipher key distribution unit 320 is used for sending key according to the key distribution strategy of broadcasting service to the user's of subscribed broadcast business terminal.
The key distribution strategy of described broadcasting service comprises:
MUK conduct and user-dependent key are upgraded by protocol requirement.
MSK (update cycle is configurable) weekly upgrades once, carries out the hash grouping by Subscriber Number, and same group of user uses identical MSK.The user was evenly distributed in the update cycle, and in system, disposes busy period, when the spare time, issue MSK and upgrade, reduce impact network.
MTK per hour upgrades once, issues the MIKEY packet of the MTK that is encrypted by MSK in broadcasting stream.MTK media content issue preceding and the term of validity in repeat distribution, the cycle of issuing can several seconds even a few minutes, the concrete time is configurable.
Lost efficacy for user's order cancellation or order relations, the MSK update request by BM-SC initiatively is initiated to UE is updated to illegal value to the MSK on the UE, cancellation user's rights of using.
For MSK, ordered business the user, not receiving at the appointed time effectively has Key, and terminal can be reached the standard grade the user and be used when professional, and application or the update request of initiatively initiating MSK arrive BM-SC, obtain or upgrade MSK.
In sum, the present invention can provide the function of the user being carried out authentication and charging at the MBMS broadcasting service., Stock Market Analysis live for mobile TV, horse racing etc. is to the attractive content of user, operator can be by the operation of MBMS broadcasting service, can make full use of Internet resources, increase the application scenarios of MBMS broadcasting service, help the use and the popularization of MBMS broadcasting service.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1. a media broadcasting method is characterized in that, comprises step:
The user orders multi-media broadcasting service;
When user's order/cancellation broadcasting service, the operation charge system arrives broadcast multicast service center with information synchronization; When user's cancellation, operation charge system notification broadcast multicast service center finish cancellation handle, when user's number of changing, operation charge system notification broadcast multicast service center finishes that the number of changing is handled and/or when collecting the customer charge failure, operation charge system notification broadcast multicast service center order cancellation relation, termination user's rights of using;
Broadcast multicast service center is carried out the hash grouping according to Subscriber Number to the user, and one group of user uses same multimedia broadcast-multicast service service key MSK;
Broadcast multicast service center issues MSK and arrives the user's of subscribed broadcast business user terminal according to user's ordering information; Perhaps user terminal if no MSK of discovery or MSK are expired, initiatively arrives broadcast multicast service center application or renewal when the broadcasting service declaration of receiving encryption;
The operation charge system is chargeed according to the user of described user's ordering information to subscribed broadcast business;
Described broadcast multicast service center broadcast encryption data flow and broadcasting;
User terminal utilizes decruption key that the broadcast data stream that receives is decrypted.
2. media broadcasting method according to claim 1 is characterized in that, described user orders multi-media broadcasting service and comprises that the user orders multi-media broadcasting service on the foreground, business hall or by portal website of operator to the operation charge system.
3. media broadcasting method according to claim 1, it is characterized in that, described broadcast multicast service center broadcast encryption data flow is meant and adopts multimedia broadcast-multicast service transmission security key MTK secure service data when business datum issues, also comprise the MIKEY packet of the MTK that encrypted with MSK in the data flow of broadcasting.
4. media broadcasting method according to claim 3, it is characterized in that, described user terminal utilizes aforementioned decruption key that the broadcast data stream that receives is decrypted to comprise: the MSK that the user terminal utilization obtains, the MTK enciphered data that receives is decrypted, obtain MTK, and utilize MTK that broadcast data stream is decrypted.
5. media broadcasting method according to claim 1, it is characterized in that, also comprise: when issuing MSK, if there is not multimedia broadcast-multicast service user key MUK on the user terminal to user terminal, then by user terminal application MUK, and be saved in user terminal.
6. media broadcasting method according to claim 1 is characterized in that, comprises that also broadcast multicast service center regular update MSK is to user terminal.
7. media broadcasting method according to claim 1 is characterized in that, comprises that also broadcast multicast service center is upgraded User Status, and issues invalid MSK to user terminal, stops user's use for the user of order cancellation or fee failure; If issue failure, then retry is expired to the original MSK term of validity always.
8. a multimedia broadcast service system is characterized in that, comprising:
The operation charge system is used to receive user's ordering information and is sent to broadcast multicast service center;
Broadcast multicast service center is used for issuing the MSK decruption key to the user of current subscribed broadcast business, encrypts MTK with MSK, and with MTK broadcast encryption data flow and broadcast;
User terminal is used for receiving and deciphering key and broadcast data stream, and utilizes MSK decruption key deciphering MTK information, and utilizes the MTK decruption key that broadcast data stream is decrypted;
User's ordering information processing unit, be used for receiving from user's data, when user's order/cancellation broadcasting service, information synchronization is arrived broadcast multicast service center, when user's cancellation, the notification broadcast multicast service center finish cancellation handle, when user's number of changing, operation charge system notification broadcast multicast service center finishes that the number of changing is handled and/or when collecting the customer charge failure, notification broadcast multicast service center order cancellation relation, termination user's rights of using;
User's Charging Detail Record unit is used for finishing according to the order relations of user's broadcasting service and charges and the function that keeps accounts; Described broadcast multicast service center comprises: the key generation unit is used for generating key according to the key generation strategy of broadcasting service; Described key generation strategy is according to Subscriber Number the user to be carried out the hash grouping, and one group of user uses same MSK; Cipher key distribution unit is used for sending key according to the key distribution strategy of broadcasting service to the user's of subscribed broadcast business user terminal.
CN2006100663734A 2006-03-30 2006-03-30 Multimedia broadcast service system and method Expired - Fee Related CN101047956B (en)

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