KR20070067334A - System and method for paid service of broadcasting multi media data in dmb mobile terminal - Google Patents

Abstract

A system and a method for charging users for broadcasting multimedia data are provided to receive a control word value for a paid file from a paging message and a CDMA(Code Division Multiple Access) network and generate a 64-bit control word value to achieve double security. A system for charging users for broadcasting multimedia data includes a broadcasting transmission server, a mobile communication network(20), and a broadcasting mobile communication terminal(30). The broadcasting transmission server transmits a paging message including a transport packet address of an identifier and a control word value from multimedia data as a broadcasting signal. The mobile communication network generates other encryption keys through control word values of multimedia data collected through the packet address and transmits the encryption keys. The broadcasting mobile communication terminal combines the control word value of the broadcasting signal and the encryption keys received from the mobile communication network to generate a 64-bit control word value of a connection control system.

Description

System and method for paid service of broadcasting multi media data in DMB mobile terminal}

1 is a configuration diagram showing an Initial Word including information on a paid file according to the prior art.

2 is a configuration diagram illustrating a paging message structure of a fast information data channel according to an embodiment of the present invention.

3 is a system for providing a pay service by generating a control word (Control Word) using a broadcasting network and a mobile communication network according to the present invention.

4 is a flowchart illustrating a monetization service method using a paging message of a fast information data channel according to the present invention.

The present invention relates to a mobile communication terminal, and more particularly, to a pay service system for broadcasting multimedia data and a method using the same.

The biggest advantage of the conventional DAB system is to provide a variety of data services in addition to the audio service that provides the CD level sound quality. In order to provide various data services, a multimedia object transfer (MOT) protocol must be used. MOT is basically a protocol for file transfer and provides various services mainly by linking with Eureka-147 packet mode and PAD (Program Associated Data). The monetization scheme of the DAB system is made through an Entitlement Checking Message (ECM) and an Entitlement Management Message (EMM) transmitted by FIG. 6 of the fast information channel. ECM contains CW (Control Word), which is encrypted and later used to perform descramble. Data channels defined in Eureka-147 include a method using a main service channel (MSC) and a method using a fast information data channel (FIDC). Paging service, disaster broadcasting service and simple traffic information can be transmitted through this channel. In particular, the paging service can deliver arbitrary information to a specific user.

1 is a configuration diagram showing an Initial Word including information on a paid file according to the present invention.

The scrambler defined in the Eureka-147 standard uses the IW (Initialization Word) value as a key value as a pseudo-random binary generator (PRBS). IW is composed of Initialization Modifier (IM) and Control Word (CW). The IM is generated based on the logical frame count value, and the CW transmits the ECM message through the fast information channel (FIC) as described above. Most data services delivered by the Multimedia Object Transfer (MOT) protocol are transmitted in packet mode, and the identifier of each service is identified by the packet address at the network layer. At this time, the multimedia files constituting each service correspond to objects of the MOT layer and are classified into transport identifiers of the transport layer. The value is extracted during decoding of FIG 0/3 and the Data Group Header. The terrestrial DMB receiver extracts CA (Conditional Access) parameters into LSB 16 bits of FIG 0/3 to charge the data service component, acquires the encryption environment information, and uses the EMM / ECM transmitted through FIG 6 based on this information. Used for monetization procedures. When transferring files through the existing Eureka-147 and MOT, a specific ACS (Access Control System) implemented inside the terminal for monetization must be defined and used. At this time, the key value for the ACS access uses only the key value provided by the broadcast mom. However, broadcasting networks have many vulnerabilities in terms of information security for key values in that an unspecified majority can receive them. That is, since it is not a user-oriented dedicated path like the CDMA network, the possibility of hacking is high, and thus there is a problem in the reliability of the ACS system in pay data broadcasting.

The present invention is to solve the above problems, the terminal receives the control key (Control Word) value for the paid file from the paging message and the CDMA network, respectively, 64-bit encryption key value to create a double security The purpose is.

The present invention for achieving the above object is a broadcast transmission server for transmitting a paging message including a transport packet address of the identifier and a control key value from the multimedia data as a broadcast signal; A mobile communication network for generating and transmitting the remaining encryption key through the control key value of the multimedia data collected through the packet address; And a broadcast mobile communication terminal for generating a 64-bit control key value of an access control system by combining a control key value of the broadcast signal and an encryption key received from the communication network.

In addition, the present invention provides a pay service method using a paging message of the high-speed information data channel, the method comprising the steps of: receiving a broadcast signal to detect the packet address and the control key value of the pay file; Collecting multimedia data through the packet address of the detected pay file, reproducing the multimedia data, and requesting a communication network to authenticate use of the pay file according to the control key value; And generating a 64-bit control key of the access control system combining the control key value of the broadcast signal and the encryption key received from the communication network. The present invention can be applied to a fee-based service of multimedia data based on various digital broadcasting systems such as DAB system, terrestrial DMB, satellite DMB, media flo, and the like.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a paging message structure of a fast information data channel according to an embodiment of the present invention.

The paging message transmitted through the Fast Information Data Channel (FIDC) is the lower 32 bits of the Control Word value in the paging user group of the Least Significant Bit (LSB). Send it. In addition, a second field, a packet address, indicates a network layer address including object information of an encrypted MOT (Multi media Object Transfer) protocol.

3 is a system for providing a pay service by generating a control key using a broadcasting network and a mobile communication network according to the present invention.

The broadcaster 10 transmits a packet address and a control key for transmitting a MOT object identifier for a paid file through a high-speed information data channel (FIDC) used as an alarm function for service information (SI) of the high-speed information channel (FIC). Includes a paging message including a (Control Word) value and transmits it as a broadcast signal. On the other hand, the EMM is transmitted through FIG. 6 as before. The mobile communication network 20 receives a lower 32-bit control key value of an MOT object packet address from a terminal through a code division multiple access (CDMA) access method, generates and transmits an upper 32-bit encryption key. In this case, the encryption key is transmitted in the form of a short message (SMS), and the mobile communication network 20 charges the corresponding content of the paid file. The broadcast mobile communication terminal 30 receives the lower 32-bit control key value from the paging message and the upper 32-bit encryption key from the mobile communication network to generate a 64-bit control key value. At this time, the terminal 30 inputs the 64-bit control word value of the access control system (ACS) to play the paid file.

4 is a flowchart illustrating a paid service method using a paging message of a fast information data channel according to the present invention.

A packet address and a control word value for transmitting the MOT object identifier of the pay file are detected from the broadcast signal received through the paging message of the fast information data channel (S400 and 401). At this time, the encrypted MOT object information of the pay file corresponds to the packet address field. The control word value of the paging message is a lower 32 bit value of the LSB (Least Significant Bit) transmitted by a paging user group. The MOT object is detected through the packet address, and a control key of the paid object is stored accordingly (S402). The CDMA network requests a control key value for the fee-based authentication (S403). The remaining encryption key generated from the communication network is received (S404). The encryption key is received in the form of a short message (SMS) and is the upper 32-bit value of the Least Signifi cant Bit (LSB). The control word value of the paging message is combined with the encryption key received from the communication network to generate a 64-bit control word value of the access control system (ACS) and input the same to play the paid file (S405). .

The present invention provides a dual security system by generating an encryption key combined from a mobile communication network and a broadcasting network system for a paying service of broadcasting multimedia data when a user of a broadcasting terminal uses a multimedia pay service, and inputs and authenticates it to an access control system (ACS). It is effective to use.

Claims (17)

Detecting a packet address and a control key value of a pay file by receiving a broadcast signal; Collecting multimedia data through the packet address of the detected pay file, reproducing the multimedia data, and requesting a communication network to authenticate use of the pay file according to the control key value; And And generating a 64-bit control key of the access control system combining the control key value of the broadcast signal and the encryption key received from the communication network. The method of claim 1, The multimedia data is a pay service method of the multimedia data for broadcasting, characterized in that it comprises an object of the MOT layer. The method of claim 2, And the multimedia data corresponds to a packet address field. The method of claim 1, And the control key value is transmitted by a paging user group. The method of claim 1, The control key is a low-cost 32-bit value of LSB (Least Signifi cant Bit), the broadcasting service method of the multimedia data for broadcasting. The method of claim 1, And a cryptographic key received from the communication network is a higher 32-bit value of LSB (Least Significant Bit). The method of claim 1, The communication network is a code division multiple access (CDMA) system, characterized in that the fee for the service of broadcasting multimedia data. The method of claim 1, The encryption key is a paid service method of broadcasting multimedia data, characterized in that received in a short message (SMS). The method of claim 1, The method of claim 1, further comprising the step of playing the pay file by inputting the generated 64-bit control key. A broadcast transmission server for transmitting a paging message including a transport packet address of an identifier and a control key value from the multimedia data as a broadcast signal; A mobile communication network for generating and transmitting the remaining encryption key through the control key value of the multimedia data collected through the packet address; And And a broadcast mobile communication terminal for generating a 64-bit control key value of an access control system by combining a control key value of the broadcast signal and an encryption key received from the communication network. The method of claim 10, And the control key value is transmitted by a service user group. The method of claim 10, The mobile communication network receives a control key value of the pay file and charges the corresponding content. The method of claim 10, The control key value is a low-cost 32-bit value of the LSB (Least Significant Bit), the broadcasting service system for the multimedia data. The method of claim 10, And a cryptographic key received from the communication network is an upper 32-bit value of LSB (Least Significant Bit). The method of claim 10, The encryption key is a paid service system for broadcasting multimedia data, characterized in that received in a short message (SMS). The method of claim 10, And the mobile communication network is a code division multiple access (CDMA) network. The method of claim 10, And the access control system receives the generated 64-bit control key and plays the paid file.

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