WO2009127109A1 - 一种终端获取解密解扰信息的方法及装置 - Google Patents

一种终端获取解密解扰信息的方法及装置 Download PDF

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Publication number
WO2009127109A1
WO2009127109A1 PCT/CN2008/072706 CN2008072706W WO2009127109A1 WO 2009127109 A1 WO2009127109 A1 WO 2009127109A1 CN 2008072706 W CN2008072706 W CN 2008072706W WO 2009127109 A1 WO2009127109 A1 WO 2009127109A1
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Prior art keywords
data
ecm
terminal
identifier
program
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PCT/CN2008/072706
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English (en)
French (fr)
Inventor
晏祥彪
王标
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP08873911A priority Critical patent/EP2278800B1/en
Priority to RU2010144568/07A priority patent/RU2486693C2/ru
Publication of WO2009127109A1 publication Critical patent/WO2009127109A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]

Definitions

  • the present invention relates to the field of mobile multimedia broadcasting, and in particular, to a method and apparatus for obtaining decryption and descrambling information by a mobile multimedia broadcast terminal.
  • Mobile multimedia broadcasting is a multimedia playback technology that has emerged in recent years. Users can watch multimedia services such as TV through high-speed mobile terminals through handheld terminals.
  • the terminal receives the multimedia service program list on the wireless broadcast channel, selects the channel that has the right to watch, so that the multimedia data in the channel can be received and played, and the television is watched on the mobile terminal.
  • CMMB technology is the latest development of mobile multimedia broadcasting technology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the mobile multimedia service is sent to the receiving terminal by using the downlink broadcast method.
  • the duration of the broadcast channel frame is 1 second, one time slot every 25 milliseconds, and 40 time slots per broadcast channel frame.
  • the multimedia broadcast service data is transmitted in a time division manner.
  • the CMMB broadcast channel frame consists of a control logical channel (referred to as a control channel) and a service logical channel (referred to as a traffic channel).
  • a control channel referred to as a control channel
  • a service logical channel referred to as a traffic channel.
  • the first time slot (time slot 0) of the CMMB broadcast channel is a control logical channel for transmitting control information; the other time slots are service logical channels for transmitting mobile multimedia service data.
  • Control information and multimedia service data are transmitted in the form of multiplexed frames on the control logical channel and the service logical channel, respectively.
  • Each multiplex frame occupies an integer number of time slots and consists of a multiplexed frame header and a payload.
  • the load of the control logical channel multiplexing frame is composed of multiple control information tables;
  • the payload of the service logical channel multiplexing frame is composed of multiple multiplexed subframes, and the number of multiplexed subframes is indicated in the multiplexed frame header;
  • the multiplex sub-frames are composed of a multiplex sub-frame header, a video segment, an audio segment, and a data segment, and each segment (video segment, audio segment, data segment) is composed of a segment header and a plurality of segment units.
  • the structure of the multiplexed frame header is shown in Figure 2.
  • the encryption and authorization system of the mobile multimedia broadcasting system encrypts multimedia data such as audio and video to ensure that only users who are legally authorized can use the decryption and descramble information to the multimedia data.
  • the decryption and descrambling is performed to normally play the program content of the received multimedia broadcast; the non-authorized user cannot acquire and use the decrypted descrambling information to decrypt the media data, which ensures the normal operation of the mobile multimedia broadcast system.
  • the mobile multimedia broadcast system needs to transmit the decrypted descrambling information to the mobile terminal through a suitable transmission channel, and the mobile terminal uses the decrypted descrambling information to obtain an encrypted control word to decrypt the multimedia service data, so that the multimedia broadcast service can be normally used.
  • There are various transmission methods for decrypting descrambling information including an out-of-band transmission method and an in-band transmission method.
  • the traditional out-of-band transmission method can transmit the decryption and descrambling information through the transmission channel of the mobile communication network or the broadband wireless network, but the method needs to increase the association indication of the service, so as to indicate that the decrypted and descrambled information of the transmission will be used for a certain Or a specified type of multimedia service, which will increase the bandwidth occupation and system complexity, increase operating costs, and is not conducive to the development of mobile broadcast networks.
  • the in-band transmission method uses the same mobile multimedia broadcast channel as the multimedia service data to transmit the encrypted control information.
  • the digital television broadcasting system encapsulates the encryption control information into a transport packet, which uses a transport packet identifier different from the service media data; since a transport packet different from the multimedia service data is used, it is also necessary to increase the association of the service.
  • the indication information associates the decrypted and descrambled information of the transmission with the corresponding multimedia service, which also increases the bandwidth occupation and the complexity of the system.
  • the existing out-of-band and in-band transmission methods for decrypting and descrambling information need to occupy a certain bandwidth transmission service association indication information, so the corresponding method for receiving/obtaining the decryption and descrambling information also needs to receive and use the above.
  • the service association indication information increases the complexity of the mobile multimedia broadcast terminal.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method and device for acquiring decryption and descrambling information that can reduce bandwidth occupation and reduce the complexity of a mobile multimedia broadcast terminal.
  • the present invention provides a method for a terminal to acquire decrypted descrambling information, where a mobile multimedia broadcast terminal receives a data from a multiplexed subframe in which data of a program is located, according to an ECM data sheet.
  • the meta type value identifies and acquires the ECM data in the decrypted descrambling information; and identifies and acquires the EMM data according to the EMM data unit type value from the multiplex subframe data segment corresponding to the service identifier used for transmitting the EMM data.
  • the terminal receives an encrypted authorization description table from the mobile multimedia broadcast control channel, and obtains the ECM data unit type value and the EMM data unit of the conditional access system to which the terminal belongs from the table according to the condition of the terminal receiving the system identifier. Type value.
  • the terminal receives the encrypted authorization description table from the mobile multimedia broadcast control channel, and obtains the service identifier used by the transmission EMM data from the table according to the conditional reception system identifier of the terminal.
  • the terminal receives an encrypted authorization description table from the mobile multimedia broadcast control channel, and obtains a corresponding ECM transmission mode identifier from the table according to the condition of the terminal receiving system identifier, and according to the manner, the identifier needs to be in the program.
  • the ECM data is received in a multiplex subframe data segment in which the data is located.
  • the terminal learns whether the program is a scrambled program according to an encryption indication field value of a multiplex sub-frame header in which the data of the program is located.
  • the terminal learns whether the ECM data is transmitted in the data segment of the multiplex subframe according to the ECM indication field value of the multiplex subframe header where the data of the program is located.
  • the present invention further provides a decryption and descrambling information acquiring apparatus for a mobile multimedia broadcast terminal, comprising: a decryption descrambling information reading unit; the apparatus further comprising an identifier reading unit; wherein:
  • the identifier reading unit is configured to read and output an ECM data unit type value and an EMM data unit type value, and a service identifier for transmitting the EMM data;
  • the decryption descrambling information reading unit is configured to identify and acquire ECM data in a multiplex subframe data segment in which data of the program is located according to the ECM data unit type value output by the identifier reading unit; Identifying the EMM data unit type value output by the reading unit, and identifying and acquiring the EMM data from the multiplex subframe data segment corresponding to the service identifier of the EMM data.
  • the identifier reading unit is further configured to acquire and output the corresponding ECM data unit type value and the EMM data unit from the encryption authorization description table according to the conditional receiving system identifier of the terminal. Type value.
  • the identifier reading unit is further configured to read a conditional receiving system identifier of the terminal, and obtain and output a corresponding ECM transmission mode identifier from the encryption authorization description table according to the conditional receiving system identifier of the terminal;
  • the decryption descrambling information reading unit is configured to receive the ECM data in the multiplex subframe data segment in which the data of the program is located according to the ECM transmission mode identifier.
  • the association information and the association protocol between the transmission program service data and the ECM data are omitted. Parsing, and using the association relationship to obtain the corresponding ECM data operation, thereby saving the bandwidth resource of the mobile multimedia broadcast network, and simplifying the operation of the mobile multimedia broadcast terminal to acquire the ECM data, reducing the condition of the terminal to accept the system to the terminal resource Claim.
  • FIG. 1 is a schematic diagram of a CMMB broadcast channel frame structure
  • FIG. 2 is a schematic diagram of a CMMB multiplexing frame header structure
  • FIG. 3 is a schematic structural diagram of a CMMB multiplex subframe
  • FIG. 4 is a flow chart of a method for a mobile multimedia broadcast terminal to acquire decryption and descrambling information according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an apparatus for acquiring decryption and descrambling information of a mobile multimedia broadcast terminal according to an embodiment of the present invention. Preferred embodiment of the invention
  • one multiplex sub-frame only encapsulates the data of one program, that is, the program and the multiplex sub-frame have a one-to-one correspondence relationship. Therefore, the front end (ie, the transmitting end) of the mobile multimedia broadcast system can put the multimedia data scrambled by one program and the corresponding entitlement control message (ECM) according to the above correspondence between the program and the multiplex subframe. Transmitting in the same multiplex subframe; correspondingly, the mobile multimedia broadcast terminal receives the scrambled multimedia data and the corresponding ECM in the same multiplex subframe, and descrambles the multimedia data in combination with other decrypted descrambling information .
  • ECM entitlement control message
  • FIG. 3 is a schematic structural diagram of a multiplex subframe.
  • the multiplex subframe is composed of a multiplex subframe header, a video segment, an audio segment, and a data segment.
  • the multiplex subframe header includes: a header length of the multiplex subframe, an encryption indication, an ECM indication, and the like, and the plurality of complete multiplex subframes are formed into a multiplexed frame and then sent to the mobile multimedia broadcast terminal through the mobile multimedia broadcast channel.
  • the encryption indication in the multiplex subframe header in FIG. 3 is used to identify whether the program corresponding to the multiplex subframe is encrypted (scrambled); and the ECM indicates whether the data segment used to identify the multiplex subframe includes decryption. De-scrambled ECM data.
  • FIG. 4 is a flow chart of a method for a mobile multimedia broadcast terminal to acquire decryption and descrambling information according to an embodiment of the present invention. As shown in Figure 4, the method includes the following steps:
  • the mobile multimedia broadcast terminal user selects a program to be viewed (received) according to a program guide or an electronic service guide (ESG) of the mobile multimedia broadcast, and selects and reuses the service configuration table according to the service identifier of the program.
  • the configuration table finds a multiplex subframe used by the program;
  • the mobile multimedia broadcast terminal acquires an encryption authorization description table on the control channel;
  • the multimedia broadcasting terminal usually needs to correctly obtain the decryption and descrambling information of the mobile multimedia service in order to correctly receive the multimedia service data transmitted by the front-end broadcast channel of the mobile multimedia broadcasting system.
  • Decryption and descrambling information mainly includes: Authorization management letter Entitlement Management Message (EMM) and ECM.
  • the encryption authorization description table is one of the mobile multimedia broadcast control information tables, and is identified and acquired from the control channel according to the table identifier.
  • the cryptographic authorization description table may be associated with one or more cryptographic authorization systems and EMMs, ECMs in the transport stream.
  • the encryption authorization description table mainly includes the following contents:
  • Table - ID (Table Identification Number): 8-bit field, used to identify the control information table as a cryptographic authorization description table;
  • Section—Length length 16-bit field, including the table identification number, excluding the CRC—32 field, in bytes;
  • Update—Number A 4-bit field indicating the encryption authorization description table update sequence number. When the content in the encryption authorization description table changes, the encryption authorization description table update sequence number needs to be changed to identify the change.
  • the update sequence number is in the range of 0 ⁇ 15 cycles, and each update adds 1;
  • Section—Number 8-bit field, indicating the serial number of the encrypted authorization description table, starting from 0.
  • Section Quantity 8-bit field indicating the number of segments divided by the encryption authorization description table
  • CA System ID condition access (CA) system identifier
  • the terminals of different conditional receiving systems have different identification numbers of the CA system;
  • Service-ID A 16-bit field indicating the service identification number corresponding to the EMM data.
  • the EMM data of the CA system will be transmitted in the multiplex subframe corresponding to the service identifier.
  • ECM_Data_Type 8-bit field indicating the type of data unit in which the ECM data is in the multiplex subframe
  • CRC—32 32-bit field containing the CRC (Cyclic Redundancy Check) value.
  • the mobile multimedia broadcast terminal is according to the terminal
  • the CA system identifier of the CA system (usually stored in the conditional receiving card or the default CA system identifier) obtains the corresponding EMM service identifier, EMM data unit type, ECM data unit type, ECM transmission mode, etc. in the table.
  • the EMM data unit type field is used to identify EMM data, and the ECM data unit type user identifier is ECM data; for example, the EMM data unit type and the ECM data unit type can respectively take values: 128, 129.
  • the mobile multimedia broadcast terminal searches for a multiplex subframe in which the EMM data is located from the service configuration table and the multiplexing configuration table according to the EMM service identifier, and identifies and acquires the EMM data in the multiplex subframe according to the EMM data unit type value.
  • the EMM data is repeatedly cyclically transmitted in the data segment in the corresponding multiplex subframe.
  • the mobile multimedia broadcast terminal determines, according to the encryption indication in the subframe header of the multiplex subframe corresponding to the to-be-received program, whether the program is encrypted. If the program is encrypted, the decryption and descrambling information needs to be obtained to complete the authorization of the user;
  • the ECM indication field of the multiplex sub-frame header determines whether the multiplex sub-frame data segment has ECM data, and if yes, identifies and acquires ECM data in the multiplex sub-frame according to the ECM data unit type value;
  • the mobile multimedia broadcast terminal may also determine whether the multiplex subframe data segment has ECM data according to the ECM transmission mode field in the encryption authorization description table.
  • the EMM and the ECM can decrypt the descrambling information to obtain the control word, and use the control word to descramble the multimedia data of the program, so that the mobile multimedia can be viewed.
  • Broadcast programs while unauthorized multimedia broadcast terminal users can obtain EMM and ECM, they cannot use EMM and ECM to decrypt descrambling information to obtain control words, and can not descramble the media data of the program, and cannot watch the festival.
  • the process of obtaining control words using EMM and ECM is mainly included (the specific details involved in the following process are outside the scope of the present invention):
  • the mobile multimedia broadcast terminal After receiving the EMM, the mobile multimedia broadcast terminal uses the personal identification code (usually stored in the conditional receiving card) and the EMM data to solve the intermediate key;
  • FIG. 5 is a schematic structural diagram of an apparatus for acquiring decryption and descrambling information of a mobile multimedia broadcast terminal according to an embodiment of the present invention.
  • the device includes: an identifier reading unit, and a decryption descrambling information reading unit; wherein:
  • an identifier reading unit configured to: read an identifier of the conditional access system to which the terminal belongs from the conditional receiving card or use an identifier of the conditional receiving system that is terminated by the terminal;
  • the encryption indication field and the ECM indication field are read and output.
  • Decryption descrambling information reading unit for:
  • the ECM data in the decryption and descrambling information is transmitted in the multiplex subframe data segment corresponding to the to-be-received program;
  • the identification code solves the intermediate password; Identifying and acquiring ECM data in the multiplex subframe data segment corresponding to the program to be received according to the ECM data unit type value output by the identifier reading unit, and outputting the ECM data to the decryption descrambling unit of the mobile multimedia broadcast terminal, and decrypting the descrambling unit
  • the control word for descrambling is solved using the ECM data and the intermediate password described above, thereby completing decryption and descrambling of the program.
  • the present invention obtains the ECM data in the decryption descrambling information from the multiplex subframe corresponding to the program to be received, and omits the analysis of the association information and the association protocol between the transmission program service data and the ECM data, and uses The association obtains the operation of the corresponding ECM data, thereby saving the bandwidth resource of the mobile multimedia broadcast network, and also simplifies the operation of the mobile multimedia broadcast terminal to acquire the ECM data, and reduces the requirement of the terminal conditional acceptance system for the terminal resource.

Description

一种终端获取解密解扰信息的方法及装置
技术领域
本发明涉及移动多媒体广播领域， 尤其涉及一种移动多媒体广播终端获 取解密解扰信息的方法及装置。
背景技术
移动多媒体广播是近年来兴起的一种广播方式的多媒体播放技术。 用户 通过手持终端， 在高速移动的情况下， 可以观看电视等多媒体业务。 终端在 无线广播信道接收多媒体业务节目单， 选择有权利收看的频道， 从而可以接 收并播放频道中的多媒体数据， 实现在移动终端上看电视。
CMMB 技术是最新发展起来的移动多媒体广播技术， 基于 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用 )调制技术, 釆 用下行广播方式将移动多媒体业务发给接收终端， 其中广播信道帧时长为 1 秒， 每 25毫秒为一个时隙， 每个广播信道帧有 40个时隙， 为了节约接收终 端功耗， 釆用时分方式发送多媒体广播业务数据。
CMMB广播信道帧由控制逻辑信道（简称控制信道）和业务逻辑信道（简 称业务信道）组成。 如图 1所示， CMMB广播信道的第 1个时隙 （时隙 0 ) 为控制逻辑信道， 用于传送控制信息； 其它时隙为业务逻辑信道， 用于传送 移动多媒体业务数据。
控制信息和多媒体业务数据以复用帧的形式分别在控制逻辑信道和业务 逻辑信道发送。 每个复用帧占用整数个时隙， 由复用帧头和载荷组成。 其中， 控制逻辑信道复用帧的载荷由多个控制信息表组成； 业务逻辑信道复用帧的 载荷由多个复用子帧组成， 复用子帧的数量在复用帧头中指示； 每个复用子 帧由复用子帧头、 视频段、 音频段、 数据段组成， 每个段（视频段、 音频段、 数据段） 由段头和多个段单元组成。 复用帧头的结构如图 2所示。
移动多媒体广播系统的加密授权系统， 通过对音频视频等多媒体数据进 行加密， 保证只有得到合法授权的用户才能利用解密解扰信息对多媒体数据 进行解密解扰， 进而正常播放接收到的多媒体广播的节目内容； 而非授权用 户则无法获取并使用解密解扰信息来解密媒体数据， 这保证了移动多媒体广 播系统的正常运营。
移动多媒体广播系统需要将解密解扰信息通过合适的传输通道传送给移 动终端， 移动终端使用解密解扰信息得到加密控制字对多媒体业务数据进行 解密， 从而可以正常使用多媒体广播业务。 解密解扰信息的传输方法有多种， 包括带外传输方法和带内传输方法。
传统的带外传输方法可以通过移动通信网络或宽带无线网络的传输通道 来传输解密解扰信息， 但是釆用这种方法需要增加业务的关联指示， 以便指 示传输的解密解扰信息将用于某个或者某类指定的多媒体业务， 这将增加带 宽的占用和系统的复杂度， 增加运营成本， 不利于移动广播网络的发展。
带内传输方法使用与多媒体业务数据相同的移动多媒体广播通道来传输 加密控制信息。 例如， 数字电视广播系统将加密控制信息封装成传输包来传 输， 该传输包使用与业务媒体数据不同的传输包标识； 由于使用了与多媒体 业务数据不同的传输包， 因此同样需要增加业务的关联指示信息对传输的解 密解扰信息与对应的多媒体业务进行关联， 这同样会增加带宽占用和系统的 复杂度。
综上所述， 现有的解密解扰信息的带外、 带内传输方法都需要占用一定 的带宽传输业务关联指示信息， 因此对应的解密解扰信息的接收 /获取方法也 需要接收并使用上述业务关联指示信息， 增加了移动多媒体广播终端的复杂 度。
发明内容
本发明所要解决的技术问题是， 克服现有技术的不足， 提供一种可减少 带宽占用、 降低移动多媒体广播终端复杂度的解密解扰信息的获取方法及装 置。
为了解决上述问题， 本发明提供一种终端获取解密解扰信息的方法， 移 动多媒体广播终端从节目的数据所在的复用子帧数据段中，根据 ECM数据单 元类型值识别并获取解密解扰信息中的 ECM数据；并从传输 EMM数据使用 的业务标识对应的复用子帧数据段中， 根据 EMM数据单元类型值识别并获 取 EMM数据。
此外， 所述终端从移动多媒体广播控制信道中接收加密授权描述表， 并 根据终端的条件接收系统标识符从该表中获取终端所属的条件接收系统的所 述 ECM数据单元类型值、 EMM数据单元类型值。
此外， 所述终端从移动多媒体广播控制信道中接收加密授权描述表， 并 根据终端的条件接收系统标识符从该表中获取所述传输 EMM数据使用的业 务标识。
此外， 所述终端从移动多媒体广播控制信道中接收加密授权描述表， 并 根据终端的条件接收系统标识符从该表中获取对应的 ECM传送方式标识，并 根据该方式标识获知需要在所述节目的数据所在的复用子帧数据段中接收所 述 ECM数据。
此外， 所述终端根据所述节目的数据所在的复用子帧头的加密指示字段 值获知所述节目是否为加扰的节目。
此外，所述终端根据所述节目的数据所在的复用子帧头的 ECM指示字段 值获知所述 ECM数据是否在该复用子帧的数据段中传输。
本发明还提供一种移动多媒体广播终端的解密解扰信息获取装置， 包含 解密解扰信息读取单元； 该装置还包含标识读取单元； 其中：
所述标识读取单元用于读取并输出 ECM数据单元类型值和 EMM数据单 元类型值， 以及传输 EMM数据的业务标识；
所述解密解扰信息读取单元用于根据所述标识读取单元输出的所述 ECM数据单元类型值， 在节目的数据所在的复用子帧数据段中识别并获取 ECM数据； 根据所述标识读取单元输出的所述 EMM数据单元类型值， 从所 述 EMM数据的业务标识对应的复用子帧数据段中识别并获取 EMM数据。
此外， 所述标识读取单元还用于根据终端的条件接收系统标识符从加密 授权描述表中获取并输出对应的所述 ECM数据单元类型值和 EMM数据单元 类型值。
此外 , 所述标识读取单元还用于读取终端的条件接收系统标识符 , 并根 据终端的条件接收系统标识符从加密授权描述表中获取并输出对应的 ECM 传送方式标识；
所述解密解扰信息读取单元根据该 ECM传送方式标识获知需要在所述 节目的数据所在的复用子帧数据段中接收所述 ECM数据。
子帧头中的加密指示字段值和 ECM指示字段值；
所述解密解扰信息读取单元根据所述加密指示字段值获知所述节目是否 为加扰传输的节目， 根据所述 ECM指示字段值获知所述 ECM数据是否在该 复用子帧的数据段中传输。
釆用本发明的上述技术方案， 通过从待接收节目对应的复用子帧中获取 解密解扰信息中的 ECM数据， 省去了传输节目业务数据和 ECM数据之间的 关联信息和关联协议的解析， 并使用该关联关系获取对应的 ECM数据的操 作， 从而节约了移动多媒体广播网络的带宽资源， 同时也简化了移动多媒体 广播终端获取 ECM数据的操作， 减低终端的条件接受系统对终端资源的要 求。 附图概述
图 1为 CMMB广播信道帧结构示意图；
图 2为 CMMB复用帧头结构示意图；
图 3为 CMMB复用子帧结构示意图；
图 4为本发明实施例移动多媒体广播终端获取解密解扰信息的方法流程 图；
图 5为本发明实施例移动多媒体广播终端的解密解扰信息获取装置结构 示意图。 本发明的较佳实施方式
由于移动多媒体广播一个节目的数据封装在一个复用子帧中传输， 一个 复用子帧仅封装一个节目的数据， 也就是说节目和复用子帧间具有一一对应 的关系。 因此移动多媒体广播系统前端 （即发送端） 可以根据节目和复用子 帧之间的上述对应关系， 将一个节目加扰后的多媒体数据和对应的授权控制 信息（ Entitlement Control Message , 简称 ECM )放在同一个复用子帧中传输； 对应地， 移动多媒体广播终端在同一个复用子帧中接收加扰后的多媒体数据 和对应的 ECM, 并结合其它解密解扰信息对多媒体数据进行解扰。
下面将结合附图和实施例对本发明进行详细描述。
图 3为复用子帧的结构示意图。 如图 3所示， 复用子帧由复用子帧头、 视频段、 音频段和数据段组成。 复用子帧头中包含： 复用子帧的头长度、 加 密指示、 ECM指示等字段， 多个完整的复用子帧组成复用帧后通过移动多媒 体广播信道发送给移动多媒体广播终端。
其中， 图 3中复用子帧头中的加密指示用于标识该复用子帧对应的节目 是否加密（加扰）； ECM指示用于标识该复用子帧的数据段是否包含用于解 密解扰的 ECM数据。
图 4为本发明实施例移动多媒体广播终端获取解密解扰信息的方法流程 图。 如图 4所示， 该方法包含如下步骤：
401 :移动多媒体广播终端用户根据移动多媒体广播的节目单或电子业务 指南 （Electronic Service Guide, 简称 ESG ) , 选择待收看 （接收） 的节目， 并根据该节目的业务标识从业务配置表和复用配置表查找得到该节目所使用 的复用子帧；
402: 移动多媒体广播终端在控制信道获取加密授权描述表；
多媒体广播终端作为移动多媒体广播系统的核心组成部分， 为了正确接 收移动多媒体广播系统前端广播信道传输的多媒体业务数据， 通常需要正确 获取移动多媒体业务的解密解扰信息。 解密解扰信息主要包含： 授权管理信 息 ( Entitlement Management Message, 简称 EMM )和 ECM。
而为了获取 EMM和 ECM, 首先需要获取加密授权描述表， 加密授权描 述表是移动多媒体广播控制信息表中的一种， 根据表标识从控制信道识别并 获取。 加密授权描述表可以为一个或多个加密授权系统与传送流中的 EMM、 ECM建立关联。 加密授权描述表主要包含以下内容：
Table— ID (表标识号）： 8位字段， 用于标识该控制信息表为加密授权描 述表；
Section— Length (段长度） ： 16位字段， 包括表标识号， 不包括 CRC— 32 字段， 单位为字节；
Update— Number (更新序号 )： 4位字段，表示加密授权描述表更新序号。 当该加密授权描述表中的内容出现变化时， 加密授权描述表更新序号需要改 变以标识该变化。 更新序号在 0 ~ 15循环取值， 每次更新加 1；
Section— Number (段号） ： 8位字段， 表示加密授权描述表段序号， 由 0 开始计数。
Section Quantity (段数量 )： 8位字段， 表示加密授权描述表分割的段数 量；
CA System ID (条件接收（ Conditional Access, 简称 CA )系统标识符）：
16位字段， 表示 CA系统的标识号， 不同的条件接收系统的终端具有不同的 CA系统的标识号；
Service— ID (业务标识）： 16位字段，表示 EMM数据对应的业务标识号， CA系统的 EMM数据将在此业务标识对应的复用子帧中传输；
EMM— Data— Type ( EMM数据单元类型 )： 8位字段， 表示 EMM数据在 复用子帧中的数据单元类型；
ECM_Data_Type ( ECM数据单元类型） ： 8位字段， 表示 ECM数据在 复用子帧中的数据单元类型；
ECM— Transfer— Type ( ECM传送方式）：用于标识 ECM数据的传输方式； 其中：
00: 表示 ECM数据在对应的节目加扰数据的复用子帧数据段中传输； 01 - 11 : 保留。
CRC— 32: 32位字段， 包含 CRC ( Cyclic Redundancy Check, 循环冗余校 验）值。
403 : 获取到加密授权描述表后， 移动多媒体广播终端根据终端所属的
CA系统的 CA系统标识符（通常存储在条件接收卡中， 或者是默认的 CA系 统标识符 )在该表中获取对应的 EMM业务标识、 EMM数据单元类型、 ECM 数据单元类型和 ECM传送方式等字段；
其中， EMM数据单元类型字段用于标识 EMM数据， ECM数据单元类 型用户标识 ECM数据； 例如， EMM数据单元类型和 ECM数据单元类型可 以分别取值： 128, 129。
404: 移动多媒体广播终端根据 EMM业务标识从业务配置表和复用配置 表中查找 EMM数据所在的复用子帧， 并根据 EMM数据单元类型值在该复 用子帧中识别并获取 EMM数据；
EMM数据在相应复用子帧中的数据段中重复循环发送。
405:移动多媒体广播终端根据待接收节目对应复用子帧的子帧头中的加 密指示判断该节目是否加密， 如果是加密节目， 需要获取解密解扰信息来完 成对用户的授权；并根据该复用子帧头的 ECM指示字段判断该复用子帧数据 段是否有 ECM数据， 如果有， 则根据 ECM数据单元类型值识别并获取该复 用子帧中的 ECM数据；
当然，移动多媒体广播终端也可以根据加密授权描述表中的 ECM传送方 式字段判断该复用子帧数据段是否有 ECM数据。
406: 若该移动多媒体广播终端为所属 CA系统的授权用户终端， 则可以 使用 EMM和 ECM等解密解扰信息得到控制字，并使用控制字对节目的多媒 体数据进行解扰， 从而可以收视移动多媒体广播的节目； 而未授权移动多媒 体广播终端用户虽然可以获得 EMM和 ECM, 但无法利用 EMM和 ECM等 解密解扰信息得到控制字， 不能对节目的媒体数据进行解扰， 无法收看该节 。 利用 EMM和 ECM得到控制字的过程主要包含（以下过程涉及的具体细 节不在本发明的讨论范围之内） ：
406a: 收到 EMM后移动多媒体广播终端使用个人识别码（通常存储在 条件接收卡中 )和 EMM数据解出中间密钥；
406b: 使用上述中间密钥和 ECM解出控制字；
407c: 把上述控制字送给解密解扰单元进行解扰操作。
图 5为本发明实施例移动多媒体广播终端的解密解扰信息获取装置结构 示意图。 如图 5所示， 该装置包含： 标识读取单元， 解密解扰信息读取单元； 其中：
标识读取单元， 用于： 从条件接收卡中读取终端所属的条件接收系统的标识符或者使用终端默 认的条件接收系统的标识符；
根据该标识符从加密授权描述表中读取并输出对应的 ECM数据单元类 型值、 EMM数据单元类型值、 EMM数据的业务标识、 ECM传送方式标识； 从待接收节目对应的复用子帧头中读取并输出加密指示字段和 ECM指 示字段。
解密解扰信息读取单元， 用于：
根据标识读取单元输出的加密指示字段获知待接收节目为加扰传输的节 目；
根据标识读取单元输出的 ECM指示字段或 ECM传送方式标识获知解密 解扰信息中的 ECM数据在待接收节目对应的复用子帧数据段中传输；
根据标识读取单元输出的 EMM数据的业务标识获知传输解密解扰信息 中的 EMM数据的复用子帧；
根据标识读取单元输出的 EMM数据单元类型值在相应的复用子帧中识 别并获取 EMM数据， 并将其输出到移动多媒体广播终端的解密解扰单元； 解密解扰单元使用 EMM数据和个人识别码解出中间密码； 根据标识读取单元输出的 ECM数据单元类型值在待接收节目对应的复 用子帧数据段中识别并获取 ECM数据，并将其输出到移动多媒体广播终端的 解密解扰单元，解密解扰单元使用 ECM数据和上述中间密码解出用于解扰的 控制字， 从而完成对节目的解密解扰。
工业实用性 本发明通过从待接收节目对应的复用子帧中获取解密解扰信息中的 ECM数据， 省去了传输节目业务数据和 ECM数据之间的关联信息和关联协 议的解析，并使用该关联关系获取对应的 ECM数据的操作，从而节约了移动 多媒体广播网络的带宽资源，同时也简化了移动多媒体广播终端获取 ECM数 据的操作， 减低终端的条件接受系统对终端资源的要求。

Claims

权 利 要 求 书
1、 一种终端获取解密解扰信息的方法，其特征在于，移动多媒体广播终 端从节目的数据所在的复用子帧数据段中，根据授权控制信息 ECM数据单元 类型值识别并获取解密解扰信息中的 ECM数据； 并从传输授权管理信息 EMM数据使用的业务标识对应的复用子帧数据段中，根据 EMM数据单元类 型值识别并获取 EMM数据。
2、 如权利要求 1所述的方法，其特征在于， 所述终端从移动多媒体广播 控制信道中接收加密授权描述表， 并根据终端的条件接收系统标识符从该表 中获取终端所属的条件接收系统的所述 ECM数据单元类型值、 EMM数据单 元类型值。
3、 如权利要求 1所述的方法，其特征在于， 所述终端从移动多媒体广播 控制信道中接收加密授权描述表， 并根据终端的条件接收系统标识符从该表 中获取所述传输 EMM数据使用的业务标识。
4、 如权利要求 1所述的方法，其特征在于， 所述终端从移动多媒体广播 控制信道中接收加密授权描述表， 并根据终端的条件接收系统标识符从该表 中获取对应的 ECM传送方式标识，并根据该方式标识获知需要在所述节目的 数据所在的复用子帧数据段中接收所述 ECM数据。
5、 如权利要求 1所述的方法， 其特征在于， 所述终端根据所述节目的 数据所在的复用子帧头的加密指示字段值获知所述节目是否为加扰的节目。
6、 如权利要求 1所述的方法，其特征在于， 所述终端根据所述节目的数 据所在的复用子帧头的 ECM指示字段值获知所述 ECM数据是否在该复用子 帧的数据段中传输。
7、 一种移动多媒体广播终端的解密解扰信息获取装置，包含解密解扰信 息读取单元； 其特征在于， 该装置还包含标识读取单元； 其中： 所述标识读取单元用于读取并输出 ECM数据单元类型值和 EMM数据单 元类型值， 以及传输 EMM数据的业务标识； 所述解密解扰信息读取单元用于根据所述标识读取单元输出的所述
ECM数据单元类型值， 在节目的数据所在的复用子帧数据段中识别并获取 ECM数据； 根据所述标识读取单元输出的所述 EMM数据单元类型值， 从所 述 EMM数据的业务标识对应的复用子帧数据段中识别并获取 EMM数据。
8、 如权利要求 7所述的装置，其特征在于， 所述标识读取单元还用于根 据终端的条件接收系统标识符从加密授权描述表中获取并输出对应的所述 ECM数据单元类型值和 EMM数据单元类型值。
9、 如权利要求 7所述的装置，其特征在于， 所述标识读取单元还用于读 取终端的条件接收系统标识符， 并根据终端的条件接收系统标识符从加密授 权描述表中获取并输出对应的 ECM传送方式标识；
所述解密解扰信息读取单元根据该 ECM传送方式标识获知需要在所述 节目的数据所在的复用子帧数据段中接收所述 ECM数据。
10、 如权利要求 7所述的装置， 其特征在于， 所述标识读取单元还用于 读取并输出所述节目的数据所在的复用子帧头中的加密指示字段值和 ECM 指示字段值；
所述解密解扰信息读取单元根据所述加密指示字段值获知所述节目是否 为加扰传输的节目， 根据所述 ECM指示字段值获知所述 ECM数据是否在该 复用子帧的数据段中传输。
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