WO2008075832A1 - Transmission and reception apparatuses and methods used in terrestrial dmb conditional access system - Google Patents

Transmission and reception apparatuses and methods used in terrestrial dmb conditional access system Download PDF

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Publication number
WO2008075832A1
WO2008075832A1 PCT/KR2007/005172 KR2007005172W WO2008075832A1 WO 2008075832 A1 WO2008075832 A1 WO 2008075832A1 KR 2007005172 W KR2007005172 W KR 2007005172W WO 2008075832 A1 WO2008075832 A1 WO 2008075832A1
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WO
WIPO (PCT)
Prior art keywords
channel
service component
conditional access
service
management message
Prior art date
Application number
PCT/KR2007/005172
Other languages
French (fr)
Inventor
Jinhwan Lee
Yong-Hoon Lee
Chung-Hyun Ahn
Soo-In Lee
Original Assignee
Electronics And Telecommunications Research Institute
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Publication date
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to EP07833481A priority Critical patent/EP2095639A4/en
Priority to CN2007800500513A priority patent/CN101584213B/en
Publication of WO2008075832A1 publication Critical patent/WO2008075832A1/en

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Classifications

    • 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
    • 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
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/23—Arrangements for conditional access to broadcast information or to broadcast-related services using cryptography, e.g. encryption, authentication, key distribution
    • 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
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
    • H04N21/2408—Monitoring of the upstream path of the transmission network, e.g. client requests
    • 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
    • H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
    • H04N21/25866—Management of end-user data
    • H04N21/25891—Management of end-user data being end-user preferences
    • 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
    • H04N21/45—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]
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/165—Centralised control of user terminal ; Registering at central
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/15—Arrangements for conditional access to broadcast information or to broadcast-related services on receiving information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/19—Arrangements for conditional access to broadcast information or to broadcast-related services on transmission of information

Definitions

  • the present invention relates to a transmission and reception apparatuses and methods used in a conditional access system that limitedly allows access to a terrestrial digital multimedia broadcasting (T-DMB) service, and more particularly, to a transmission and reception methods and apparatuses capable of reducing overhead of a transmission bit-rate by effectively transmitting and receiving the entitlement management messages (EMMs) of a T-DMB conditional access system.
  • T-DMB terrestrial digital multimedia broadcasting
  • a conditional access system is a system that transforms an original broadcasting signal so that only a receiver that has an entitlement on a corresponding broadcasting program can be provided with the broadcasting program.
  • the transforming of the original broadcasting signal so as not to enable an unauthorized receiver to be provided with the broadcasting is referred to as scrambling, and a key used for the scrambling is referred to as a control word.
  • an transmission apparatus in a conditional access system which limitedly allows access to a T-DMB service
  • the transmission apparatus comprising: an inserting location selector that selects a single service component from a transmission frame which includes a main service channel including sub-channels including one or more service components and a fast information channel which transmits control information regarding the main service channel; an entitlement management message inserting unit that inserts an entitlement management message which is used to grant or update the entitlement on the T-DMB service to the selected single service component; and an inserting location provider that provides location information regarding the selected single service component to the fast information channel.
  • a transmission method used in a conditional access system which limitedly allows access to a T-DMB service, the transmission method comprising: (a) selecting a single service component from a transmission frame which includes a main service channel including subchannels including one or more service components and a fast information channel which transmits control information regarding the main service channel; (b) inserting an entitlement management message, which is used to grant or update the entitlement on the T-DMB service, to the selected single service component; and (c) providing location information regarding the selected single service component to the fast information channel.
  • a reception method used in a conditional access system which limitedly allows access to a T-DMB (terrestrial digital multimedia broadcasting) service
  • the reception method comprising: (a) receiving a reception frame including a main service channel including sub- channels including one or more service components and a fast information channel which transmits control information regarding the main service channel; (b) acquiring location information regarding the entitlement management message which is used to grant or update the entitlement on the T-DMB service from the fast information channel; and (c) extracting the entitlement management message from the main service channel by using the acquired location information.
  • the EMM of the T-DMB conditional access system is not inserted into each service component that is to be scrambled, however the EMM is inserted into only a single service component that is to be scrambled, so that overhead of a transmission bit-rate according to the conditional access service can be reduced.
  • FIGS. IA and IB are views illustrating structures of a transmission frame and a transmission protocol of a terrestrial digital multimedia broadcasting (T-DMB), according to embodiments of the present invention
  • FIG. 2 is a view illustrating a structure of a T-DMB conditional access system according to an embodiment of the present invention
  • FIG. 3 is a view illustrating a structure of a transmission apparatus in a T-DMB conditional access system according to an embodiment of the present invention
  • FIGS. 4A to 4C are views illustrating data structures of a fast information group
  • FIG. 5 is a flowchart of a transmission method used in the T-DMB conditional access system according to an embodiment of the present invention
  • FIG. 6 is a view illustrating a structure of a reception apparatus in a T-DMB conditional access system according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a receiving method used in a T-DMB conditional access system according to an embodiment of the present invention
  • FIG. 8 is a flowchart of a method of extracting and processing an entitlement control message (ECM) and an EMM by a reception apparatus in a T-DMB conditional access system according to an embodiment of the present invention.
  • ECM entitlement management message
  • FIG. 3 is a view illustrating a structure of a transmission apparatus in a T-DMB conditional access system according to an embodiment of the present invention.
  • the transmission apparatus according to the current embodiment of the present invention includes an inserting location selector 310, an entitlement management message inserting unit 320, and an inserting location provider 330.
  • the transmission apparatus inserts EMM and EMM location information into a transmission frame that is to be transmitted.
  • the inserting location selector 310 selects a service component into which the EMM is to be inserted from among one or more service components included in the MSC 130 (see FIG. 1) of the transmission frame. Unlike the fact that the ECM and the CASyncParam are inserted to each service component included in the MSC 130, the EMM is inserted into only the selected service component. Therefore, overhead of a transmission bit-rate according to duplicate transmission of the EMM can be reduced.
  • a service component having high frequency of use is selected as the single service component into which the EMM is to be inserted. This can increase an efficiency of a terminal.
  • the EMM is transmitted to a service component having low frequency of use, a case where a service component that is practically provided to a subscriber and a service component including the EMM, that is, that two service components have to be processed in the terminal simultaneously, frequently occurs, and this may cause degradation of the efficiency of the terminal and the power consumption, and the like.
  • [23] As a method of measuring frequency of use for example, there is a method of measuring the frequency of use based on the number of charge subscribers when the service components are charged for. Otherwise, there is a method of measuring the frequency of use by using audience measurement research.
  • the entitlement management message inserting unit 320 inserts the EMM into the single service component selected by the inserting location selector 310.
  • a method of inserting the EMM into the selected service component is determined according to a range in which the selected service component is scrambled, that is, according to a conditional access mode of the selected service component.
  • CAMode 420 is '000'), that is, when the conditional access mode of the selected service component is the sub-channel mode, the EMM is inserted into a sub-channel conditional access prefix (SUBCAPrefix) field of the sub-channel to which the selected service component belongs.
  • SABCAPrefix sub-channel conditional access prefix
  • the SUBCAPrefix is used to transmit the conditional access internal message to a header field of the sub-channel disposed before the scrambled contents.
  • CAMode 420 is 1 OOl') or in the MOT mode (the CAMode 420 is 1 OlO'), that is, the conditional access mode of the selected service component is in the data group mode or the MOT mode, the EMM is inserted into an MSC data group data field.
  • the EMM When the EMM is not inserted into a specified location, the EMM is inserted to each service component included in the MSC 130.
  • the inserting location provider 330 carries information that indicates a location of the service component into which the EMM is inserted in the FIC 120 of the transmission frame.
  • the inserting location provider 330 uses the CAIntChar field in the FIG type 6 in the
  • the CAIntChar field delivers conditional access internal characteristics such as a version of the conditional access system used for the conditional access service, an applied algorithm, system specific parameters, channel ID, length information, and the like.
  • FIG. 5 is a flowchart of a transmission method used in the T-DMB conditional access system according to an embodiment of the present invention.
  • the transmission method according to the embodiment includes operations performed in time series by the transmission apparatus illustrated in FIG. 3. Therefore, the aforementioned description of the transmission apparatus illustrated in FIG. 3 can be applied to the transmission method according to the present embodiment.
  • a single service component is selected from among one or more service components included in the MSC 130 (see FIGS. IA and IB) of the transmission frame (operation S510).
  • a service component having high frequency of use is selected as the single service component into which the EMM is to be inserted.
  • operation S520 A method of inserting the EMM into the SUBCAPrefix field of a sub-channel to which the service component belongs or into an MSC data group data field is used as a method of inserting the EMM into the selected service component according to a range in which the selected service component is scrambled, that is, a conditional access mode of the selected service component.
  • the EMM is inserted into each service component included in the MSC 130.
  • the EMM location information is carried in the FIC 120 (see FIGS. IA and IB) of the transmission frame (operation S530).
  • a CAIntChar field in the FIG type 6 is used as a location at which the EMM location information is delivered in the FIC 120.
  • the EMM location information is a sub-channel identifier, or a sub-channel identifier and a service component identifier according to the conditional access mode of the service component.
  • FIG. 6 is a view illustrating a structure of a reception apparatus in the T-DMB conditional access system according to an embodiment of the present invention.
  • the reception apparatus according to the current embodiment of the present invention includes an EMM location acquisition unit 610 and an EMM extractor 620. By means of the construction, the reception apparatus extracts the EMM from a reception frame, and gets the entitlement of the service component from the EMM, so that the reception apparatus can be provided with the scrambled service component.
  • the EMM location acquisition unit 610 acquires the location information regarding the inserted EMM from the FIC 120 (see FIGS. IA and IB) of the reception frame.
  • the CAIntChar field in the FIG type 6 is used as the location at which the EMM location information is included in the FIC 120.
  • the reception apparatus receives conditional access internal characteristics such as a version of the conditional access system used for the conditional access service, an applied algorithm, system specific parameters, channel ID, length information, and the like through the CAIntChar field in the FIG type 6.
  • conditional access mode (CAMode) 420 of the service component that is indicated by the EMM location information in the EMM location information acquired from the CAIntChar field of the FIG type 6 is the sub-channel mode ('000')
  • the SubChld 410 is extracted.
  • CAMode 420 of the service component indicated by the EMM location information is the data group mode ('001') or the MOT mode ('010')
  • the SubChld 410 and the SCId 430 are extracted.
  • the EMM extractor 620 extracts the EMM from the MSC 130 (see FIGS. IA and
  • the EMM is extracted from SUBCAPrefix field of the sub-channel indicated by the SubChld 410.
  • the CAMode 420 of the service component indicated by the EMM location information is in the data group mode ('001') or the MOT mode ('010')
  • the EMM is extracted from the MSC data group data field of the service component indicated by the SubChld 410 and SCId 430.
  • the EMM extractor 620 extracts the EMM from each service component included in the MSC 130.
  • FIG. 7 is a flowchart of a reception method used in the T-DMB conditional access system according to an embodiment of the present invention.
  • the reception method according to the current embodiment includes operations performed in time series by the reception apparatus illustrated in FIG. 6. Therefore, the aforementioned description of the reception apparatus illustrated in FIG. 6 can be applied to the reception method according to the present embodiment.
  • the EMM is extracted from the MSC 130 (see FIG. 1) of the reception frame by using the location information regarding the service component acquired in operation S710.
  • the CAMode 420 of the service component indicated by the EMM location information
  • the EMM is extracted from the SUBCAPrefix field of the sub-channel indicated by the extracted SubChld 410, or the EMM is extracted from the MSC data group data field of the service component indicated by the extracted SubChld) 410 and the SCId 430.
  • FIGS. IA and IB are views illustrating structures of a transmission frame and a transmission protocol of a terrestrial digital multimedia broadcasting (T-DMB), according to embodiments of the present invention.
  • the transmission frame (ensemble frame) of a T-DMB includes a synchronization channel 110, a fast information channel (FIC) 120, and a main service channel (MSC) 130.
  • FIC fast information channel
  • MSC main service channel
  • the synchronization channel 110 includes information used to synchronize each transmission frame.
  • the FIC 120 includes multiplexing construction information, service information, and the like to enable a receiver to rapidly access the information.
  • the FIC 120 includes a plurality of fast information blocks (FIBs), and each FIB includes a plurality of fast information groups (FIGs).
  • the FIC 120 not the MSC 130, delivers the parameters used for a conditional access service such as whether a conditional access is applied, an applied conditional access mode, and the like, and signaling associated with the conditional access.
  • an FIG type 6 in the FIC 120 is used to transmit parameters associated with the conditional access.
  • conditional access internal characteristics CAIntChar
  • CAIntChar such as a version of the conditional access system used for the conditional access service, an applied algorithm, system specific parameters, channel identification (ID), length information, and the like are delivered.
  • the MSC 130 includes a plurality of sub-channels, and each of the sub-channels includes one or more service components.
  • the MSC 130 delivers DMB contents corresponding to a payload and a conditional access internal message, such as an entitlement management message (EMM) and an entitlement control message (ECM).
  • EMM entitlement management message
  • ECM entitlement control message
  • Broadcasting data of the T-DMB is hierarchically multiplexed according to characteristics of a service component, and is finally multiplexed to have a single ensemble frame type so as to be transmitted.
  • a mode is selected from three conditional access modes, which are a sub-channel mode, a data group mode, and a multimedia object transfer (MOT) mode, according to a class and characteristics of a corresponding service component in order to apply the mode to the conditional access.
  • a mode is selected from three conditional access modes, which are a sub-channel mode, a data group mode, and a multimedia object transfer (MOT) mode, according to a class and characteristics of a corresponding service component in order to apply the mode to the conditional access.
  • MOT multimedia object transfer
  • the sub-channel mode indicates scrambling all sub-channels of the MSC 130. More specifically, scrambling of an audio sub-channel 131 including programme associated data (PAD) 135, a packet mode sub-channel 132, and a stream mode sub-channel 133.
  • PID programme associated data
  • the data group mode indicates scrambling an MSC data group 140 transmitted through the packet mode sub-channel 132 or the PAD 135.
  • Data transmitted through an MOT directory mode 141, an MOT header mode 142, an Internet protocol (IP) tunneling 143, and a transparent data channel (TDC) 144 are to be scrambled.
  • IP Internet protocol
  • TDC transparent data channel
  • the MOT mode indicates scrambling a portion of or the entire objects in a structure of the MOT directory mode 141.
  • FIG. 2 is a view illustrating a structure of a T-DMB conditional access system according to an embodiment of the present invention.
  • a transmitter of the T-DMB conditional access system includes a conditional access message encoder 210, a control word generator 220, a synchronizer 230, a scrambler 240, and an ensemble multiplexer 250.
  • a receiver includes a demultiplexer 260, a conditional access message decoder 270, a synchronizer 280, and a descrambler 290.
  • conditional access message encoder 210 generates the ECM and the EMM.
  • the ECM includes the encrypted control word.
  • the ECM is periodically transmitted for security, and at each transmission, a new control word is encrypted.
  • the EMM is used to grant or update an entitlement on the T-DMB service.
  • conditional access internal message CAIntMessage
  • the control word generator 220 generates a control word, which is a key used to scramble contents and transmits the generated control word to the synchronizer 230.
  • the synchronizer 230 synchronizes the scrambling operation and the control word transmitting operation.
  • the control word generated by the control word generator 220 is transmitted to the scrambler 240 and the conditional access message encoder 210 through the synchronizer 230.
  • conditional access synchronization parameters (CASyncParam) are generated to allow operations of decoding messages and descrambling contents performed by the receiver to be in synchronization with each other.
  • a toggle signal that indicates that the control word has changed is a necessary parameter in the CASyncParam.
  • the scrambler 240 mixes and transforms the contents by using the control word generated by the control word generator 220 as a key so that a receiver that does not have the entitlement cannot access the contents.
  • the multiplexer 250 multiplexes the contents scrambled by the scrambler 240, the conditional access internal message generated by the conditional access message encoder 210, and the synchronization parameter generated by the synchronizer 230, so as to generate a single ensemble frame.
  • the demultiplexer 260 demultiplexes the ensemble frame into the scrambled contents, the conditional access internal message, and the synchronization parameter.
  • conditional access message decoder 270 analyzes the conditional access system internal message received from the demultiplexer 260 so as to perform entitlement management, entitlement checking, and control word handling.
  • the synchronizer 280 analyzes the conditional access synchronization parameter received from the demultiplexer 260 to synchronize the control word and transmit the control word to the descrambler 290.
  • the descrambler 290 descrambles the scrambled contents received from the demultiplexer 260 by using the control word received from the conditional access message decoder 270.
  • FIG. 8 is a flowchart of a method of extracting and processing the ECM and the
  • EMM used in a reception apparatus in the T-DMB conditional access system according to an embodiment of the present invention.
  • the ECM is extracted from the service component that is desired to be received, and the EMM stored in the buffer is also extracted to be used along with the ECM, so that the desired service component is descrambled and can be normally provided (operation S850).

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Graphics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Provided are transmission and reception apparatuses and methods used in a conditional access system that limitedly allows access to a terrestrial digital multimedia broadcasting (T-DMB) service. The transmission apparatus selects a single service component from a transmission frame which includes a main service channel (MSC) including sub-channels including one or more service components and a fast information channel (FIC) which transmits control information regarding the main service channel to insert an entitlement management message (EMM) that is used to grant or update the entitlement on the DMB service to the selected single service component, and provides location information regarding the selected single service component to the fast information channel.

Description

Description
TRANSMISSION AND RECEPTION APPARATUSES AND METHODS USED IN TERRESTRIAL DMB CONDITIONAL
ACCESS SYSTEM
Technical Field
[1] The present invention relates to a transmission and reception apparatuses and methods used in a conditional access system that limitedly allows access to a terrestrial digital multimedia broadcasting (T-DMB) service, and more particularly, to a transmission and reception methods and apparatuses capable of reducing overhead of a transmission bit-rate by effectively transmitting and receiving the entitlement management messages (EMMs) of a T-DMB conditional access system. Background Art
[2] A conditional access system is a system that transforms an original broadcasting signal so that only a receiver that has an entitlement on a corresponding broadcasting program can be provided with the broadcasting program. In this case, the transforming of the original broadcasting signal so as not to enable an unauthorized receiver to be provided with the broadcasting is referred to as scrambling, and a key used for the scrambling is referred to as a control word.
[3] Originally, a terrestrial digital multimedia broadcasting (T-DMB) conditional access standard is described in ETSI EN 300 401 Vl.3.3 Section 9, which is a T-DMB transmission standard. In this case, there are problems in that implementation is complex in the ETSI EN 300 401 Vl.3.3 Section 9, and a conditional access is not fully supported in a multimedia object transfer (MOT) mode. Therefore, a new standard ETSI TS 102 367 Vl.2.1 has been introduced. However, such new conditional access standard is not compatible with the conventional conditional access standard and the ETSI EN 300 401 Vl.3.3 standard, however is compatible with the ETSI EN 300 401 V 1.4.1 standard revised on June 2006. Disclosure of Invention Technical Problem
[4] According to the T-DMB conditional access standard (ETSI TS 102 367 Vl.2.1), in order to transmit a conditional access internal message, the conditional access internal message has to be provided to each service component that is to be scrambled at a single ensemble. An entitlement control message (ECM) including the control word corresponding to a scramble key has to be provided to each service component that is to be scrambled. However, when an entitlement management message (EMM) is provided repeatedly to each service component, overhead of a transmission bit-rate increases. In addition, when the EMM is provided to a single service component and not to each service component, and service components that are not provided with the EMM are to be transmitted to users, the users cannot receive the EMM, so that a normal service cannot be provided.
[5] As a method of transmitting the EMM to a service component that is to be scrambled without duplication, a method of carrying the EMM to a fast information group (FIG) type 6 or a sub-channel No. 63 (transmission without payload) or a method of carrying the EMM in an EMM-dedicated sub-channel and notifying a location of the EMM- dedicated sub-channel by a conditional access internal characteristic field in the FIG type 6 is used. However, there is a problem in that the two methods are incompatible with the ETSI TS 102 367 Vl.2.1 standard, which is the new T-DMB conditional access standard. Technical Solution
[6] According to an aspect of the present invention, there is provided an transmission apparatus in a conditional access system which limitedly allows access to a T-DMB service, the transmission apparatus comprising: an inserting location selector that selects a single service component from a transmission frame which includes a main service channel including sub-channels including one or more service components and a fast information channel which transmits control information regarding the main service channel; an entitlement management message inserting unit that inserts an entitlement management message which is used to grant or update the entitlement on the T-DMB service to the selected single service component; and an inserting location provider that provides location information regarding the selected single service component to the fast information channel.
[7] According to another aspect of the present invention, there is provided a transmission method used in a conditional access system which limitedly allows access to a T-DMB service, the transmission method comprising: (a) selecting a single service component from a transmission frame which includes a main service channel including subchannels including one or more service components and a fast information channel which transmits control information regarding the main service channel; (b) inserting an entitlement management message, which is used to grant or update the entitlement on the T-DMB service, to the selected single service component; and (c) providing location information regarding the selected single service component to the fast information channel.
[8] According to another aspect of the present invention, there is provided a reception method used in a conditional access system which limitedly allows access to a T-DMB (terrestrial digital multimedia broadcasting) service, the reception method comprising: (a) receiving a reception frame including a main service channel including sub- channels including one or more service components and a fast information channel which transmits control information regarding the main service channel; (b) acquiring location information regarding the entitlement management message which is used to grant or update the entitlement on the T-DMB service from the fast information channel; and (c) extracting the entitlement management message from the main service channel by using the acquired location information.
Advantageous Effects [9] Accordingly, the EMM of the T-DMB conditional access system is not inserted into each service component that is to be scrambled, however the EMM is inserted into only a single service component that is to be scrambled, so that overhead of a transmission bit-rate according to the conditional access service can be reduced.
Description of Drawings [10] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: [11] FIGS. IA and IB are views illustrating structures of a transmission frame and a transmission protocol of a terrestrial digital multimedia broadcasting (T-DMB), according to embodiments of the present invention; [12] FIG. 2 is a view illustrating a structure of a T-DMB conditional access system according to an embodiment of the present invention; [13] FIG. 3 is a view illustrating a structure of a transmission apparatus in a T-DMB conditional access system according to an embodiment of the present invention; [14] FIGS. 4A to 4C are views illustrating data structures of a fast information group
(FIG) type 6 that delivers entitlement management message (EMM) location information, according to embodiments of the present invention; [15] FIG. 5 is a flowchart of a transmission method used in the T-DMB conditional access system according to an embodiment of the present invention; [16] FIG. 6 is a view illustrating a structure of a reception apparatus in a T-DMB conditional access system according to an embodiment of the present invention; [17] FIG. 7 is a flowchart of a receiving method used in a T-DMB conditional access system according to an embodiment of the present invention; and [18] FIG. 8 is a flowchart of a method of extracting and processing an entitlement control message (ECM) and an EMM by a reception apparatus in a T-DMB conditional access system according to an embodiment of the present invention.
Best Mode [19] FIG. 3 is a view illustrating a structure of a transmission apparatus in a T-DMB conditional access system according to an embodiment of the present invention. [20] Referring to FIG. 3, the transmission apparatus according to the current embodiment of the present invention includes an inserting location selector 310, an entitlement management message inserting unit 320, and an inserting location provider 330. By means of the aforementioned construction, the transmission apparatus inserts EMM and EMM location information into a transmission frame that is to be transmitted.
[21] The inserting location selector 310 selects a service component into which the EMM is to be inserted from among one or more service components included in the MSC 130 (see FIG. 1) of the transmission frame. Unlike the fact that the ECM and the CASyncParam are inserted to each service component included in the MSC 130, the EMM is inserted into only the selected service component. Therefore, overhead of a transmission bit-rate according to duplicate transmission of the EMM can be reduced.
[22] A service component having high frequency of use is selected as the single service component into which the EMM is to be inserted. This can increase an efficiency of a terminal. When the EMM is transmitted to a service component having low frequency of use, a case where a service component that is practically provided to a subscriber and a service component including the EMM, that is, that two service components have to be processed in the terminal simultaneously, frequently occurs, and this may cause degradation of the efficiency of the terminal and the power consumption, and the like.
[23] As a method of measuring frequency of use, for example, there is a method of measuring the frequency of use based on the number of charge subscribers when the service components are charged for. Otherwise, there is a method of measuring the frequency of use by using audience measurement research.
[24] The entitlement management message inserting unit 320 inserts the EMM into the single service component selected by the inserting location selector 310. A method of inserting the EMM into the selected service component is determined according to a range in which the selected service component is scrambled, that is, according to a conditional access mode of the selected service component.
[25] When the selected service component is scrambled in a sub-channel mode (the
CAMode 420 is '000'), that is, when the conditional access mode of the selected service component is the sub-channel mode, the EMM is inserted into a sub-channel conditional access prefix (SUBCAPrefix) field of the sub-channel to which the selected service component belongs.
[26] The SUBCAPrefix is used to transmit the conditional access internal message to a header field of the sub-channel disposed before the scrambled contents.
[27] When the selected service component is scrambled in the data group mode (the
CAMode 420 is 1OOl') or in the MOT mode (the CAMode 420 is 1OlO'), that is, the conditional access mode of the selected service component is in the data group mode or the MOT mode, the EMM is inserted into an MSC data group data field.
[28] When the EMM is not inserted into a specified location, the EMM is inserted to each service component included in the MSC 130.
[29] The inserting location provider 330 carries information that indicates a location of the service component into which the EMM is inserted in the FIC 120 of the transmission frame.
[30] The inserting location provider 330 uses the CAIntChar field in the FIG type 6 in the
FIC 120 as the location to deliver the EMM location information. The CAIntChar field delivers conditional access internal characteristics such as a version of the conditional access system used for the conditional access service, an applied algorithm, system specific parameters, channel ID, length information, and the like.
[31] FIG. 5 is a flowchart of a transmission method used in the T-DMB conditional access system according to an embodiment of the present invention.
[32] Referring to FIG. 5, the transmission method according to the embodiment includes operations performed in time series by the transmission apparatus illustrated in FIG. 3. Therefore, the aforementioned description of the transmission apparatus illustrated in FIG. 3 can be applied to the transmission method according to the present embodiment.
[33] First, a single service component is selected from among one or more service components included in the MSC 130 (see FIGS. IA and IB) of the transmission frame (operation S510). A service component having high frequency of use is selected as the single service component into which the EMM is to be inserted.
[34] Then, the EMM is inserted into the service component selected in operation S510
(operation S520). A method of inserting the EMM into the SUBCAPrefix field of a sub-channel to which the service component belongs or into an MSC data group data field is used as a method of inserting the EMM into the selected service component according to a range in which the selected service component is scrambled, that is, a conditional access mode of the selected service component. When the EMM is not inserted into a specified location, the EMM is inserted into each service component included in the MSC 130.
[35] Location information regarding the service component selected in operation S510 is carried in the FIC 120 (see FIGS. IA and IB) of the transmission frame (operation S530). As a location at which the EMM location information is delivered in the FIC 120, a CAIntChar field in the FIG type 6 is used. The EMM location information is a sub-channel identifier, or a sub-channel identifier and a service component identifier according to the conditional access mode of the service component.
[36] FIG. 6 is a view illustrating a structure of a reception apparatus in the T-DMB conditional access system according to an embodiment of the present invention. [37] Referring to FIG. 6, the reception apparatus according to the current embodiment of the present invention includes an EMM location acquisition unit 610 and an EMM extractor 620. By means of the construction, the reception apparatus extracts the EMM from a reception frame, and gets the entitlement of the service component from the EMM, so that the reception apparatus can be provided with the scrambled service component.
[38] The EMM location acquisition unit 610 acquires the location information regarding the inserted EMM from the FIC 120 (see FIGS. IA and IB) of the reception frame. The CAIntChar field in the FIG type 6 is used as the location at which the EMM location information is included in the FIC 120. The reception apparatus receives conditional access internal characteristics such as a version of the conditional access system used for the conditional access service, an applied algorithm, system specific parameters, channel ID, length information, and the like through the CAIntChar field in the FIG type 6.
[39] If the conditional access mode (CAMode) 420 of the service component that is indicated by the EMM location information in the EMM location information acquired from the CAIntChar field of the FIG type 6 is the sub-channel mode ('000'), the SubChld 410 is extracted. If the CAMode 420 of the service component indicated by the EMM location information is the data group mode ('001') or the MOT mode ('010'), the SubChld 410 and the SCId 430 are extracted.
[40] The EMM extractor 620 extracts the EMM from the MSC 130 (see FIGS. IA and
IB) of the reception frame by using the location information acquired by the EMM location acquisition unit 610. If the CAMode 420 of the service component indicated by the EMM location information is in the sub-channel mode ('000'), the EMM is extracted from SUBCAPrefix field of the sub-channel indicated by the SubChld 410. When the CAMode 420 of the service component indicated by the EMM location information is in the data group mode ('001') or the MOT mode ('010'), the EMM is extracted from the MSC data group data field of the service component indicated by the SubChld 410 and SCId 430.
[41] When the location information acquired by the EMM location acquisition unit 610 has a predetermined value (for example, '11111111') that represents a state in which the EMM is not inserted into only a single service component, the EMM extractor 620 extracts the EMM from each service component included in the MSC 130.
[42] FIG. 7 is a flowchart of a reception method used in the T-DMB conditional access system according to an embodiment of the present invention.
[43] Referring to FIG. 7, the reception method according to the current embodiment includes operations performed in time series by the reception apparatus illustrated in FIG. 6. Therefore, the aforementioned description of the reception apparatus illustrated in FIG. 6 can be applied to the reception method according to the present embodiment.
[44] First, a reception frame including the MSC 130 and the FIC 120 is received
(operation S700).
[45] Location information regarding a service component into which the EMM is inserted is acquired from the FIC 120 (see FIGS. IA and IB) of the reception frame received in operation S700 (operation S710). As a location into which the EMM location information is inserted in the FIC 120, the CAIntChar field of the FIG type 6 is used. According to the CAMode 420 of the service component indicated by the EMM location information in the EMM location information acquired from the CAIntChar field of the FIG type 6, the SubChld 410 is extracted, or the SubChld 410 and the SCId 430 are extracted.
[46] Then, the EMM is extracted from the MSC 130 (see FIG. 1) of the reception frame by using the location information regarding the service component acquired in operation S710. According to the CAMode) 420 of the service component indicated by the EMM location information, the EMM is extracted from the SUBCAPrefix field of the sub-channel indicated by the extracted SubChld 410, or the EMM is extracted from the MSC data group data field of the service component indicated by the extracted SubChld) 410 and the SCId 430.
[47] When the location information acquired in operation S710 has a value that represents a state in which the EMM is not inserted into only a single service component, the EMM is extracted from each service component included in the MSC 130. Mode for Invention
[48] FIGS. IA and IB are views illustrating structures of a transmission frame and a transmission protocol of a terrestrial digital multimedia broadcasting (T-DMB), according to embodiments of the present invention.
[49] Referring to FIG. IA, the transmission frame (ensemble frame) of a T-DMB includes a synchronization channel 110, a fast information channel (FIC) 120, and a main service channel (MSC) 130.
[50] The synchronization channel 110 includes information used to synchronize each transmission frame.
[51] The FIC 120 includes multiplexing construction information, service information, and the like to enable a receiver to rapidly access the information. In addition, the FIC 120 includes a plurality of fast information blocks (FIBs), and each FIB includes a plurality of fast information groups (FIGs). The FIC 120, not the MSC 130, delivers the parameters used for a conditional access service such as whether a conditional access is applied, an applied conditional access mode, and the like, and signaling associated with the conditional access. In particular, an FIG type 6 in the FIC 120 is used to transmit parameters associated with the conditional access. For example, conditional access internal characteristics (CAIntChar) such as a version of the conditional access system used for the conditional access service, an applied algorithm, system specific parameters, channel identification (ID), length information, and the like are delivered.
[52] The MSC 130 includes a plurality of sub-channels, and each of the sub-channels includes one or more service components. The MSC 130 delivers DMB contents corresponding to a payload and a conditional access internal message, such as an entitlement management message (EMM) and an entitlement control message (ECM).
[53] Broadcasting data of the T-DMB is hierarchically multiplexed according to characteristics of a service component, and is finally multiplexed to have a single ensemble frame type so as to be transmitted. In a conditional access standard, a mode is selected from three conditional access modes, which are a sub-channel mode, a data group mode, and a multimedia object transfer (MOT) mode, according to a class and characteristics of a corresponding service component in order to apply the mode to the conditional access.
[54] Referring to FIG. IB, the sub-channel mode indicates scrambling all sub-channels of the MSC 130. More specifically, scrambling of an audio sub-channel 131 including programme associated data (PAD) 135, a packet mode sub-channel 132, and a stream mode sub-channel 133.
[55] The data group mode indicates scrambling an MSC data group 140 transmitted through the packet mode sub-channel 132 or the PAD 135. Data transmitted through an MOT directory mode 141, an MOT header mode 142, an Internet protocol (IP) tunneling 143, and a transparent data channel (TDC) 144 are to be scrambled.
[56] The MOT mode indicates scrambling a portion of or the entire objects in a structure of the MOT directory mode 141.
[57] FIG. 2 is a view illustrating a structure of a T-DMB conditional access system according to an embodiment of the present invention.
[58] Referring to FIG. 2, a transmitter of the T-DMB conditional access system includes a conditional access message encoder 210, a control word generator 220, a synchronizer 230, a scrambler 240, and an ensemble multiplexer 250. A receiver includes a demultiplexer 260, a conditional access message decoder 270, a synchronizer 280, and a descrambler 290.
[59] The conditional access message encoder 210 generates the ECM and the EMM.
[60] The ECM includes the encrypted control word. The ECM is periodically transmitted for security, and at each transmission, a new control word is encrypted.
[61] The EMM is used to grant or update an entitlement on the T-DMB service.
[62] As described above, the message generated by the conditional access message encoder 210 is called a conditional access internal message (CAIntMessage). [63] The control word generator 220 generates a control word, which is a key used to scramble contents and transmits the generated control word to the synchronizer 230.
[64] The synchronizer 230 synchronizes the scrambling operation and the control word transmitting operation. The control word generated by the control word generator 220 is transmitted to the scrambler 240 and the conditional access message encoder 210 through the synchronizer 230. In addition, conditional access synchronization parameters (CASyncParam) are generated to allow operations of decoding messages and descrambling contents performed by the receiver to be in synchronization with each other. A toggle signal that indicates that the control word has changed is a necessary parameter in the CASyncParam.
[65] The scrambler 240 mixes and transforms the contents by using the control word generated by the control word generator 220 as a key so that a receiver that does not have the entitlement cannot access the contents.
[66] The multiplexer 250 multiplexes the contents scrambled by the scrambler 240, the conditional access internal message generated by the conditional access message encoder 210, and the synchronization parameter generated by the synchronizer 230, so as to generate a single ensemble frame.
[67] The demultiplexer 260 demultiplexes the ensemble frame into the scrambled contents, the conditional access internal message, and the synchronization parameter.
[68] The conditional access message decoder 270 analyzes the conditional access system internal message received from the demultiplexer 260 so as to perform entitlement management, entitlement checking, and control word handling.
[69] The synchronizer 280 analyzes the conditional access synchronization parameter received from the demultiplexer 260 to synchronize the control word and transmit the control word to the descrambler 290.
[70] The descrambler 290 descrambles the scrambled contents received from the demultiplexer 260 by using the control word received from the conditional access message decoder 270.
[71] FIG. 8 is a flowchart of a method of extracting and processing the ECM and the
EMM used in a reception apparatus in the T-DMB conditional access system according to an embodiment of the present invention.
[72] Referring to FIG. 8, a frame including the MSC 130 and the FIC 120 is received
(operation S800).
[73] It is determined whether or not EMM location information exists in the CAIntChar field of the FIG type 6 of the reception frame (operation S810).
[74] If the CAIntChar field does not exist, or information regarding a specified location into which the EMM is inserted does not exist, the ECM and the EMM included in the service component that is desired to be received are extracted (operation S 820). [75] If the information regarding the specified location into which the EMM is inserted in the CAIntChar field exists, the information regarding the specified location into which the EMM is inserted is stored in a buffer (operation S830).
[76] The EMM inserted into the specified location is extracted, and if the same EMM does not exist in the buffer, the EMM is stored in the buffer (operation S840).
[77] The ECM is extracted from the service component that is desired to be received, and the EMM stored in the buffer is also extracted to be used along with the ECM, so that the desired service component is descrambled and can be normally provided (operation S850).

Claims

Claims
[1] A transmission apparatus in a conditional access system which limitedly allows access to a T-DMB (terrestrial digital multimedia broadcasting) service, the transmission apparatus comprising: an inserting location selector that selects a single service component from a transmission frame which includes a main service channel including subchannels including one or more service components and a fast information channel which transmits control information regarding the main service channel; an entitlement management message inserting unit that inserts an entitlement management message which is used to grant or update the entitlement on the T- DMB service to the selected single service component; and an inserting location provider that provides location information regarding the selected single service component to the fast information channel.
[2] The apparatus of claim 1, wherein the inserting location selector selects the single service component based on frequency of use of the service components included in the main service channel.
[3] The apparatus of claim 2, wherein the frequency of use is measured based on one or more of the number of subscribers of the service components included in the main service channel and audience measurement research.
[4] The apparatus of claim 1, wherein the entitlement management message inserting unit inserts the entitlement management message according to a conditional access mode that represents a range for limiting the entitlement of the selected single service component.
[5] The apparatus of claim 4, wherein, if the conditional access mode is in a subchannel mode, the entitlement management message inserting unit inserts the entitlement management message into a conditional access prefix of a sub-channel at which the selected single service component is disposed, and the inserting location provider provides an identifier for the sub-channel and the conditional access mode to the fast information channel.
[6] The apparatus of claim 4, wherein, if the conditional access mode is in a data group mode, the entitlement management message inserting unit inserts the entitlement management message into a main service channel data group data field of the selected single service component, and the inserting location provider provides an identifier for a sub-channel at which the selected single service component is disposed, the conditional access mode, and an identifier for the selected single service component to the fast information channel.
[7] The apparatus of claim 4, wherein, if the conditional access mode is in a multimedia object transfer mode, the entitlement management message inserting unit inserts the entitlement management message into a main service channel data group data field of the selected single service component, and the inserting location provider provides an identifier for a sub-channel at which the selected single service component is disposed, the conditional access mode, and an identifier for the selected single service component to the fast information channel.
[8] The apparatus of claim 1, wherein, if the single service component is not selected, the entitlement management inserting unit inserts the entitlement management message into each service component included in the main service channel, and the inserting location provider provides a value which represents a state in which the single service component is not selected to the fast information channel.
[9] A transmission method used in a conditional access system which limitedly allows access to a T-DMB service, the transmission method comprising:
(a) selecting a single service component from a transmission frame which includes a main service channel including sub-channels including one or more service components and a fast information channel which transmits control information regarding the main service channel;
(b) inserting an entitlement management message, which is used to grant or update the entitlement on the T-DMB service, to the selected single service component; and
(c) providing location information regarding the selected single service component to the fast information channel.
[10] The method of claim 9, wherein in (a), the single service component is selected based on frequency of use of the service components included in the main service channel.
[11] The method of claim 10, wherein the frequency of use is measured based on one or more of the number of subscribers of the service component and audience measurement research.
[12] The method of claim 9, wherein in (b), the entitlement management message is inserted according to a conditional access mode that represents a range for limiting the entitlement of the selected single service component.
[13] The method of claim 12, wherein, if the conditional access mode is a sub-channel mode, in (b), the entitlement management message is inserted into a conditional access prefix of a sub-channel at which the selected single service component is disposed, and in (c) an identifier for the sub-channel and the conditional access mode are provided to the fast information channel.
[14] The method of claim 12, wherein, if the conditional access mode is in a data group mode, in (b), the entitlement management message is inserted into a main service channel data group data field of the selected single service component, and in (c), an identifier for a sub-channel at which the selected single service component is disposed, the conditional access mode, and an identifier for the selected single service component are provided to the fast information channel.
[15] The method of claim 12, wherein, if the conditional access mode is in a multimedia object transfer mode, in (b), the entitlement management message is inserted into a main service channel data group data field of the selected single service component, and in (c), an identifier for a sub-channel at which the selected single service component is disposed, the conditional access mode, and an identifier for the selected single service component are provided to the fast information channel.
[16] The method of claim 9, wherein, if the single service component is not selected, in (b), the entitlement management message is inserted into each service component included in the main service channel, and in (c), a value which represents a state in which the single service component is not selected is provided to the fast information channel.
[17] A reception method used in a conditional access system which limitedly allows access to a T-DMB (terrestrial digital multimedia broadcasting) service, the reception method comprising:
(a) receiving a reception frame including a main service channel including subchannels including one or more service components and a fast information channel which transmits control information regarding the main service channel;
(b) acquiring location information regarding the entitlement management message which is used to grant or update the entitlement on the T-DMB service from the fast information channel; and
(c) extracting the entitlement management message from the main service channel by using the acquired location information.
[18] The method of claim 17, wherein in (a), a location of the service component is extracted from the acquired location information, according to a conditional access mode which represents a range for limiting the entitlement of the service component into which the entitlement management message is inserted.
[19] The method of claim 18, wherein, if the conditional access mode is in a subchannel mode, in (b), a sub-channel identifier is extracted from the acquired location information, and in (c), the entitlement management message is extracted from a conditional access prefix of the sub-channel indicated by the extracted sub-channel identifier.
[20] The method of claim 18, wherein, if the conditional access mode is in a data group mode, in (b), an identifier for the sub-channel and an identifier for the service component are extracted from the acquired location information, and in (c), the entitlement management message is extracted from a main service channel data group data field of a service component indicated by the extracted sub-channel identifier and the extracted service component identifier.
[21] The method of claim 18, wherein, if the conditional access mode is in a multimedia object transfer mode, in (b), a sub-channel identifier and a service component identifier are extracted from the acquired location information, and in (c), the entitlement management message is extracted from a main service channel data group data field of a service component indicated by the extracted sub-channel identifier and the service component identifier.
[22] The method of claim 17, wherein in (c), if a value which represents a state in which the entitlement management message is not inserted into the single service component is extracted in (b), the entitlement management message is extracted from each service component included in the main service channel.
PCT/KR2007/005172 2006-12-19 2007-10-22 Transmission and reception apparatuses and methods used in terrestrial dmb conditional access system WO2008075832A1 (en)

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See also references of EP2095639A4 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010095891A2 (en) * 2009-02-19 2010-08-26 Samsung Electronics Co., Ltd. Digital tranmission apparatus and method and digital reception apparatus
WO2010095891A3 (en) * 2009-02-19 2010-11-25 Samsung Electronics Co., Ltd. Digital tranmission apparatus and method and digital reception apparatus
US9281987B2 (en) 2009-02-19 2016-03-08 Samsung Electronics Co., Ltd. Digital transmission apparatus and method and digital reception apparatus
EP2399387A4 (en) * 2009-02-19 2017-01-18 Samsung Electronics Co., Ltd. Digital tranmission apparatus and method and digital reception apparatus

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EP2095639A4 (en) 2011-05-18
KR20080057125A (en) 2008-06-24
CN101584213A (en) 2009-11-18
CN101584213B (en) 2011-05-11
EP2095639A1 (en) 2009-09-02
KR100848326B1 (en) 2008-07-24

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