KR20060131158A - Method for receiving terrestrial digital multimedia broadcasting signal through gap-filler by using authentication key - Google Patents

Abstract

A method for receiving a terrestrial DMB(Digital Multimedia Broadcasting) signal from a gap filler by using an authentication key is provided to simply design the structure of a receiver, thereby reducing the size of the receiver. A DMB terminal receives a terrestrial DMB signal through a DMB antenna according to the user's request(S710). Thereafter, a microprocessor confirms TII(Transmitter Identification Information) included in a synchronization channel among transmission frames of the terrestrial DMB signal(S720). The microprocessor discriminates whether the TII of the received DMB signal is TII allocated at a transmitter or TII allocated at a repeater(S730). When the TII of the received DMB signal is TII allocated at the repeater, the DMB terminal confirms an effective period of an authentication key stored in a memory card(S740). When the stored authentication key is an effective authentication key(S750), the DMB broadcasting is received and displayed through the repeater(S760).

Description

Method for Receiving Terrestrial Digital Multimedia Broadcasting Signal through Gap-Filler by Using Authentication Key}

1 is a schematic diagram showing a terrestrial DMB service system;

2 is a diagram illustrating a method of transmitting a terrestrial DMB signal between a repeater and a receiver by using a CAS method;

3 is a frame structure of a terrestrial DMB signal including a TII according to a preferred embodiment of the present invention,

4 is a block diagram schematically illustrating an internal configuration of a repeater and a transmitter for inserting and transmitting a TII into a terrestrial DMB signal according to a preferred embodiment of the present invention;

5 is a block diagram showing the internal structure of a DMB receiver for receiving a terrestrial DMB signal using an authentication key according to a preferred embodiment of the present invention;

6 is a flowchart illustrating a method for issuing an authentication key for receiving a terrestrial DMB service in a shaded area according to a preferred embodiment of the present invention.

7 is a flowchart illustrating a process of receiving a terrestrial DMB signal transmitted from a repeater according to an authentication procedure using an authentication key according to a preferred embodiment of the present invention.

The present invention relates to a method for receiving a terrestrial DMB signal from a repeater using an authentication key. More specifically, when the receiver of the DMB broadcast downloads and stores the authentication key for receiving the paid terrestrial DMB signal, and receives the paid terrestrial DMB signal through the repeater installed in the shaded area, the received authentication key is stored. The present invention relates to a method for receiving a terrestrial DMB signal using an authentication procedure.

With the rapid development of electronic and communication technology, various wireless communication services using a wireless telecommunication network have been provided. In particular, recently, DMB (Digital Multimedia Broadcasting) services, which are capable of providing high-definition television and video regardless of a place, are provided using a mobile receiver or a vehicle receiver such as a mobile communication terminal. DMB services are classified into satellite DMB and terrestrial DMB. Satellite DMB is a method of transmitting a DMB broadcast signal to a mobile receiver using a broadcast satellite, terrestrial DMB is a method of transmitting a DMB broadcast signal to a mobile receiver using a transmitter located on the ground.

1 is a schematic diagram illustrating a terrestrial DMB service system.

The terrestrial DMB service system includes a transmitter 120 for transmitting DMB broadcasts, a transmitter 120 for transmitting a DMB signal to a receiver 130 located on the ground, and a repeater 150 for transmitting a DMB signal to a receiver 160 located in a shaded area. And a relay network operator 140 that manages the plurality of repeaters 160 and 170 and transmits the DMB signal from the broadcasting station 110 to the repeater.

When the DMB signal is transmitted to the receiver 130 located on the ground, when the DMB broadcast generated by the broadcasting station 110 is transmitted to the transmitter 120, a plurality of receivers (in the DMB receiving area 122 managed by the corresponding transmitter 120) 130) to the DMB signal.

However, such a transmission of the DMB signal has a problem in that a shaded area in which the receiver 130 cannot receive the DMB signal from the transmitter 120, such as underground or in a tunnel, is generated. In order to solve such a problem, the terrestrial DMB system constructs a separate relay network, and transmits a DMB signal to the receiver 160 located in the shadow area through the constructed relay network.

The receiver 160 located in the shadow area receives the DMB signal through the repeater 150 in charge of the shadow area. The repeater 150 is called a Gap Filler, modulates the received DMB signal by Orthogonal Frequency Division Multiplexing (OFDM), and transmits it to a plurality of receivers 160 located in a corresponding area.

In the terrestrial DMB service, the terrestrial DMB service is provided free of charge by the terrestrial DMB service using the terrestrial network portion, that is, the transmitter 120 located on the ground, but the relay network portion 150, which is located in the shadow area, In the part receiving the DMB service using the repeater 150, a lot of cost is consumed, and a method of providing the terrestrial DMB service for a fee has been proposed.

In providing a terrestrial DMB service for a fee, a conditional access system (CAS) scheme may be used as an authentication scheme in a relay network.

2 is a diagram illustrating a method of transmitting a terrestrial DMB signal between a repeater and a receiver using a CAS method.

The CAS method encrypts and transmits a DMB broadcast program using a master key at the relay network operator 140 or the repeater 150, and encrypts the received DMB broadcast program using a master key separately from the DMB broadcast program. Is how to decrypt a DMB program. Here, the CAS method will be described based on the encryption method in the repeater 150. First, the broadcast content is encrypted through the scrambler 210 in the DMB broadcast program input to the repeater 150. In this case, a control word (CW) necessary for descrambled the encrypted broadcast content in the receiver is encrypted and transmitted to the DMB broadcast program scrambled and transmitted. The control word is generated from the CW generator 220.

In addition, the ECM encoder 230 generates an Entitlement Checking Message (ECM) that encrypts a control word by using a session key, and sends it to the receiver 160 along with a broadcast program scrambled by a scrambler. send.

The EMM encoder 240 generates an Entitlement Management Message (EMM) that encrypts the session key for ECM decryption using the master key, and uses the EMM only to the receiver 160 having the viewing authority of the terrestrial DMB. send.

The receiver 160 having an EMM acquiring the terrestrial DMB, and obtains the session key from the EMM decoder 250 using the embedded master key. The control word is obtained from the ECM through the session key and the ECM decoder 260. The scrambled DMB broadcast program is decoded using the control word and the descrambler 270 to output the DMB broadcast program.

On the other hand, a receiver that does not have the right to view terrestrial DMB does not receive the EMM and thus cannot obtain a session key. Accordingly, since the control word cannot be obtained from the EMC, the scrambled DMB broadcast program cannot be executed.

The authentication method using the CAS method has the advantage that only the receiver 160 receiving the EMM can output a broadcast program, but the security is strong, but in order to use the CAS method, the repeater 150 and the receiver 160 may be used. Since the scrambler 210, the control word generator 220, the ECM encoder 230, the EMM encoder 240, the EMM decoder 250, the ECM decoder 260, the descrambler 270, and the like must be included, the structure thereof must be included. Since it is complicated, the size of the receiver 160 is increased, and there is a problem that a lot of cost is generated.

As another authentication method, an authentication server is built in the relay network operator 140, and when there is a request for receiving terrestrial DMB broadcasting from the receiver 160 in the shaded area, the information of the receiver 160 is transmitted to the authentication server of the relay network operator. There is a method of performing authentication. Using such an authentication method, the receiver can be configured in a simple structure, but since the data transmission and reception with the authentication server is required for the authentication process, it takes about 5 to 6 seconds, during which time the user can use the terrestrial DMB Since the broadcast cannot be listened to, the user is dissatisfied with switching the screen. In particular, in a receiver capable of two-way communication such as a mobile terminal, the configuration thereof can be facilitated. However, in the case of a dedicated terminal such as a vehicle TV, a configuration for the two-way communication must be separately installed. extra money is needed.

Accordingly, there is a demand for an authentication method that is excellent in security and simple in structure when receiving a paid terrestrial DMB signal.

In order to solve this problem, the receiver of the DMB broadcast downloads and stores the authentication key for receiving the paid terrestrial DMB signal, and stores the received terrestrial DMB signal through the repeater installed in the shadow area. Provides a method for receiving a terrestrial DMB signal that performs an authentication procedure using an authentication key.

A method for authenticating a terrestrial DMB signal for a fee for achieving the above technical problem, the authentication method in a terrestrial DMB receiver for watching a terrestrial digital multimedia broadcasting (DMB) broadcast, the method comprising: (a) receiving a terrestrial DMB signal; (b) checking transmitter identification information (TII) included in the terrestrial DMB signal; (c) upon confirmation of the TII, if the terrestrial DMB signal is received by the terrestrial DMB signal through the repeater, where the repeater transmits the terrestrial DMB signal for a fee in the shaded area, the signal is stored in advance in the terrestrial DMB receiver. Checking information on the authentication key; And (d) confirming the information of the authentication key, and if the authentication key is a valid authentication key, enabling the user to watch paid terrestrial DMB broadcasting.

In addition, as a terrestrial DMB receiver for achieving a second technical problem of the present invention, in a terrestrial DMB receiver displaying terrestrial digital multimedia broadcasting (DMB) broadcasting, a transmitter located on the ground, where the transmitter is a free terrestrial DMB signal Transmitting a b-terrestrial DMB signal for terrestrial DMB broadcasting transmitted from a paid terrestrial DMB signal; A data storage unit for storing software for interpreting terrestrial DMB signals and for displaying terrestrial DMB broadcasting; An authentication processing unit for determining whether a previously stored authentication key is valid for displaying a paid terrestrial DMB broadcast transmitted from a repeater and performing an authentication procedure; An LCD (Liquid Crystal Display) display unit displaying terrestrial DMB broadcasting; A speaker for outputting a voice portion of the terrestrial DMB broadcast; And calling the software of the data storage unit to check the TII of the repeater or transmitter, and if the terrestrial DMB signal is a signal transmitted from the repeater, perform an authentication procedure through the authentication processing unit, and display a series of terrestrial DMB broadcasting through the LCD display unit. It includes a microprocessor that controls the work.

In addition, as a repeater for transmitting a pay terrestrial DMB signal for achieving the third technical problem of the present invention, is installed in the shadow area, the repeater for transmitting the pay terrestrial DMB signal to the terrestrial DMB receiver located in the shadow area A transmission frame generator for converting a terrestrial DMB signal into a symbol signal including a null symbol, a phase reference symbol, a fast information channel (FIC) symbol, and a main service channel (MSC) symbol according to each transmission frame; An OFDM signal generator configured to generate an OFDM terrestrial DMB signal by performing orthogonal frequency division multiplexing (OFDM) modulation on the converted symbol signal through a transmission frame generator; A TII signal generator for generating transmitter identification information (TII) assigned as a unique number of the repeater; A summer for inserting the TII received from the TII signal generator into a null symbol position of the OFDM terrestrial DMB signal to generate a pay terrestrial DMB signal; And an amplifier for converting the paid terrestrial DMB signal into a plurality of terrestrial DMB receivers located in an area in which the repeater is in charge through an antenna.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a frame structure of a terrestrial DMB signal including TII according to a preferred embodiment of the present invention.

The conventional terrestrial DMB signal frame structure is composed of a synchronization channel 310, a fast information channel 320, and a main service channel 330 according to the standard of the terrestrial DMB transmission / reception matching standard (TTAS.KO-07.0024). Numeral 310 is set to include a null symbol and a phase reference symbol (PRS) 314. The frame structure of the terrestrial DMB signal according to the present invention includes transmitter identification information (TII) for identifying each transmitter and repeater at a null symbol position of the synchronization channel 310 (312) (312). ) Is inserted.

Here, the TII 312 is a unique number for identifying each transmitter and repeater and has a total size of 12 bits, and according to ETSI EN 300 401, 7 bits of Main ID and 5 bits of Sub ID (Sub). ID). A total of 1600 transmitters and repeaters can be identified using 70 unique values from 0 to 69 for the primary ID and 1 to 23 for the secondary ID. Each primary ID is assigned to a transmission network operator, a relay network operator, a mobile communication operator, and a broadcasting station, and a secondary ID is assigned according to each transmitter and repeater. Accordingly, by checking the TII, it is possible to confirm which carrier is transmitted and which terrestrial DMB signal is transmitted through which transmitter or repeater.

The sync channel 310 transmits a phase reference symbol 314 for frame sync, carrier frequency sync, channel state estimation and demodulation functions, along with the TII 312 for transmitter and repeater identification.

The fast information channel 320 includes a plurality of fast information channel (FIC) symbols, and the FIC symbol includes multiplex configuration information (MCI), service title and channel information for interpreting the MSC symbol of the main service channel. Service Information (SI), including Fast Information Data Channel (FIDC) for urgent data services, and Restriction of Access (CA) used for authentication when using the service. It is configured to include.

The main service channel 330 is composed of a plurality of Main Service Channel (MSC) symbols used for transmitting audio data, video data, and the like.

Here, the structure and function of the high speed information channel 320 and the main service channel 330 is known in the relevant domestic standards, the high speed information channel 320 in the frame of the terrestrial DMB signal according to the present invention and Since the main service channel 330 has the same structure and function as the fast information channel 320 and the main service channel 330 in the frame of the conventional terrestrial DMB signal, a detailed description thereof will be omitted.

When the transmitter or repeater transmits a terrestrial DMB signal including a TII to the synchronization channel 310, the receiver analyzes the TII to determine whether the signal is transmitted from a ground transmitter or a repeater located in a shaded area. Can be.

4 is a block diagram schematically illustrating the internal configuration of a repeater and a transmitter for inserting and transmitting a TII into a terrestrial DMB signal according to a preferred embodiment of the present invention.

According to the present invention, a repeater and a transmitter for transmitting a terrestrial DMB signal including TII include a transmission frame generator 410, an OFDM signal generator 420, a TII signal generator 430, a summer 440, an amplifier 450, and a transmitter. Transmit antenna 460.

The transmission frame generator 410 converts the terrestrial DMB signal received from the broadcasting station 110 or the relay network 140 into a symbol signal such as a phase reference symbol 314, an FIC symbol, and an MSC symbol by the repeater and the transmitter. .

When the terrestrial DMB signal is converted by the transmission frame generator 410 into a symbol signal having a frame structure of the terrestrial DMB signal illustrated in FIG. 3, OFDM modulation is performed through the OFDM signal generator 420. OFDM modulation is a method of overlapping and transmitting hundreds of carriers in orthogonal relations in order to improve transmission rate per bandwidth and prevent multipath interference. Since the OFDM modulation method is well known, a detailed description thereof will be omitted.

The TII signal generator 430 generates a TII assigned as a unique number to the corresponding repeater or transmitter. When the TII is generated in the TII signal generator 430, the TII is transmitted to the summer 440, and in the summer 440, Null of the synchronization channel 310 of the OFDM modulated terrestrial DMB signal transmitted from the OFDM signal generator 420. Insert TII into the symbol's position.

The amplifier 450 is a kind of scrambler, which converts the terrestrial DMB signal with the TII into a high frequency for transmission to a plurality of receivers located in an area covered by the repeater or transmitter, and then transmits the signal through the antenna 460. .

5 is a block diagram illustrating an internal structure of a DMB receiver for receiving a terrestrial DMB signal using an authentication key according to a preferred embodiment of the present invention.

Here, as mentioned above, the DMB receiver may be configured with various devices, that is, a mobile communication terminal, a PDA, a vehicle TV, a notebook computer, a navigation device, and the like. Therefore, although the internal structure of the DMB receiver is different according to each device, the internal structure of the DMB receiver according to FIG. 5 will be described as a mobile communication terminal and will be referred to as a 'DMB terminal'.

According to a preferred embodiment of the present invention, a DMB terminal that receives a terrestrial DMB signal using an authentication key includes a DMB antenna 502, a DMB receiver 504, a microprocessor 506, a data storage unit 508, and a memory 510. ), An authentication processing unit 512, a key input unit 514, an LCD display unit 516, a speaker 518, and an additional device connection unit 520.

The DMB antenna 502 receives a terrestrial DMB signal from a transmitter or a repeater and transmits it to the DMB receiver 204. The DMB receiver 504 is composed of a terrestrial DMB chip, and processes the received terrestrial DMB signal to generate a broadcast signal.

The microprocessor 506 controls the overall operation of the DMB terminal. In addition, the microprocessor 506 interprets the terrestrial DMB signal received from the DMB receiver 504, and checks whether the terrestrial DMB signal received through the TII check is a signal transmitted from a transmitter or a signal transmitted from a repeater, and the repeater In the case of the signal transmitted through the authentication process, the authentication processing unit 512 performs the authentication process and serves to display the terrestrial DMB broadcasting on the LCD display unit 516.

The data storage unit 508 is a non-volatile memory having a high data processing speed and processes operating system (OS) software having a real-time processing function for operation of a DMB terminal and functions related to call processing. Call processing software, and the like. It also includes software for the interpretation of terrestrial DMB signals and for the display of terrestrial DMB broadcasts.

The memory 510 is an EEPROM that can be electrically erased or stored again. The memory 510 is a nonvolatile memory in which data for storage such as a number assignment module (NAM) parameter, a phone number, a name, and a short message is recorded.

The authentication processing unit 512 is a part for processing an authentication procedure for the display of terrestrial DMB broadcasting according to the embodiment of the present invention. The authentication processing unit 512 stores the authentication key received from the authentication server. When a request for execution of an authentication procedure is received from the microprocessor 506, the authentication processing unit 512 determines whether the authentication key is valid, confirms the authentication, and stores the result of the micro It delivers to the processor 506.

The key input unit 514 is provided with a plurality of key buttons for inputting various data such as numbers and letters. In addition, the key input unit 514 is provided with a special key for viewing the terrestrial DMB, and when the special key is input, the microprocessor 506 starts receiving the terrestrial DMB signal, performing an authentication procedure, and displaying the terrestrial DMB signal.

The LCD (Liquid Crystal Display) display unit 516 displays the operation status of the DMB terminal, including the reception strength, date, time, and the like of the radio wave, and displays terrestrial DMB broadcasting. The speaker 518 is a part which outputs an audio part when terrestrial DBM broadcasting is displayed.

The additional device connection unit 520 is a part that transmits and receives data with an external device such as an external memory card, a camera, or a computer through a connection unit. According to the present invention, when the authentication key is stored in the external memory card inserted in the slot without storing the authentication key in the data storage unit 508 or the authentication processing unit 512, the authentication key received from the DMB terminal is transferred to the external memory card. In response to a request for providing authentication key information from the authentication processing unit 512 or the microprocessor 512, the authentication key is called from the external memory card and provided to the authentication processing unit 512 or the microprocessor 506.

Here, the TII confirmation of the terrestrial DMB signal by the microprocessor 506 may be performed in the DMB receiver 504, wherein the authentication processor 512 is directly connected to the DMB receiver 504, and the DMB receiver 504 You can also set to perform the authentication procedure in.

In addition, in the embodiment of the present invention, the authentication key is set to be stored in the data storage unit 508 rather than the authentication processing unit 512, so that the authentication key stored in the data storage unit 508 may be called in performing the authentication procedure. It is also possible to set. At this time, it is preferable that the authentication processing unit 512 and the data storage unit 508 are directly connected.

6 is a flowchart illustrating a method for issuing an authentication key for receiving a terrestrial DMB service in a shaded area according to an exemplary embodiment of the present invention.

Here, in describing the method for issuing the authentication key according to FIG. 6, the receiver will be described as being limited to the mobile communication terminal.

A user who wants to provide terrestrial DMB service through a repeater in the shadow area requests the relay network service provider to provide DMB service in the shadow area through the Internet, a telephone, or a visit to a dealer. In this case, after accessing a separate web (WEB) site or a WAP site operated by a network operator using a DMB terminal, a DMB service in a shadow area may be applied through a provided web page or a swap page. 610.

The relay network operator who is requested to provide the DMB service in the shadow area generates a subscriber information database by using the subscriber information acquired when the service is requested in step S610, and stores it in the authentication server (S620).

The authentication server generates an authentication key to be transmitted to the DMB terminal. In this case, in the generation of the authentication key, it is preferable to use a public key encryption method for security. When the authentication key is generated, the authentication information of the authentication key generated in the subscriber information database is additionally included and stored in the authentication server.

Here, the authentication key transmitted to the DMB terminal includes the expiration date information, and the authentication information stored in the authentication server includes the number (telephone number, terminal serial number, etc.) of the DMB terminal, the date of creation or renewal of the authentication key, and the validity period. It contains information such as (S630).

The authentication server delivers the generated authentication key to the DMB receiver. At this time, it is preferable to transmit the authentication key using a short message (SMS) or a multimedia message (MMS) or the like (S640).

The DMB terminal, to which the authentication key is transmitted, stores the authentication key in the data storage unit 508 or the authentication processing unit 512, and when the terrestrial DMB signal is received through the repeater, the authentication processing unit 512 uses the stored authentication key. The authentication procedure may be performed (S650).

Here, since the DMB terminal includes an authentication key whose expiration date has expired, and if there is a request for renewing the authentication key from the DMB terminal in step S610, step S620 of generating subscriber information may be omitted, and in step S630, After updating only the validity period information of the authentication key transmitted to the DMB terminal, only update information is transmitted through step S640, and the DMB terminal receiving the update information is set to change only the validity period information of the internal authentication key according to the update information. It is also possible. In addition, when the validity information is updated, it is also possible to generate a new authentication key according to the updated validity period, transmit it to the DMB terminal, and set the DBM terminal to replace the authentication key.

In addition, in the reception of the authentication key according to step S640, when the DMB terminal includes a slot for inserting an external memory card, the authentication key may be received by an external memory card inserted into the slot. By using such an external memory card, a user inserts an external memory card into a terrestrial DMB receiving device other than the corresponding DMB terminal, such as a car TV, to receive terrestrial DMB service using another terrestrial DMB receiving device in a shaded area. It may be.

7 is a flowchart illustrating a process of receiving a terrestrial DMB signal transmitted from a repeater according to an authentication procedure using an authentication key according to an exemplary embodiment of the present invention.

In the description of FIG. 7, the receiver is limited to the DMB terminal in describing the reception process of the terrestrial DMB signal. The data storage unit 508 of the DMB terminal is equipped with software for watching terrestrial DMB broadcasting (hereinafter referred to as a "DMB viewing program").

When a user inputs a special key for listening to terrestrial DMB broadcasting mounted on the key input unit 514 of the DMB terminal, or selects a menu for viewing terrestrial DMB broadcasting from various mounted menus and requests reception of terrestrial DMB broadcasting. In addition, the DMB terminal receives a terrestrial DMB signal transmitted from a repeater or a transmitter in a corresponding region using the DMB antenna 502. The terrestrial DMB signal is a common signal propagated to an unspecified number in a corresponding region, and a separate request for transmission and reception is not necessary (S710).

When the DMB terminal receives the terrestrial DMB signal, the microprocessor 506 analyzes a transmission frame of the received terrestrial DMB signal. The TII included in the synchronization channel 310 of the transmission frame of the terrestrial DMB signal is checked (S720) to determine whether the TII of the received terrestrial DMB signal is a TII assigned to the transmitter or a TII assigned to the repeater. Through this, it is determined whether the received terrestrial DMB signal is a terrestrial DMB signal transmitted from a terrestrial network transmitter or a terrestrial DMB signal transmitted from a repeater of a relay network (S730).

If the TII determines that the DMB terminal is located in a shadowed area such as a basement or a tunnel and receives the terrestrial DMB signal from the repeater of the relay network, the DMB terminal is stored in the data storage unit 508 and the authentication processing unit 512. In operation S740, the validity period of the authentication key stored in the external memory card inserted into the DMB terminal is checked through the additional device connection unit 520.

In addition, the DMB terminal checks the current time information through the mobile communication network. The time information check uses time information received during synchronization with the mobile communication network when the power of the DMB terminal is turned on.

When the DMB terminal compares the current time information received through the mobile communication network with the expiration date information stored in the authentication key, and it is determined that the authentication key stored in the DMB terminal is a valid authentication key (S750), the DMB viewing program uses a repeater. Receive and display the DMB broadcast transmitted through (S760).

However, in step S750, when comparing the current time information and the valid period, if it is determined that the stored authentication key is an invalid authentication key, the DMB terminal displays a message indicating that the terrestrial DMB broadcast cannot be received in the corresponding area. The DMB viewing program ends. Here, the DMB terminal may provide a moving menu for moving to a payment page for terrestrial DMB reception using the wireless Internet, together with a message indicating that reception of terrestrial DMB broadcasting is impossible (S770).

In operation S730, when the TII of the received terrestrial DMB signal is determined and determined to be a terrestrial DMB signal transmitted from the transmitter through the terrestrial network, the terrestrial DMB broadcast is received by executing a DMB viewing program without performing an authentication process. To display (S780).

In the above description of FIGS. 5 to 7, the receiver has been described as being limited to a mobile communication terminal having a terrestrial DMB receiving function, that is, a DMB terminal. However, the issuance and authentication procedure of the authentication key according to the present invention includes a communication function. It can also be applied to a dedicated receiver such as a car TV that does not.

At this time, the issuance of the authentication key according to FIG. 6 may be configured to store the authentication key in a computer using an e-mail or a diskette and then move to a dedicated receiver using a cable or the like. In addition, when the dedicated receiver includes an insertion slot of the external memory card, the authentication key downloaded through the DMB terminal or the computer is stored in the external memory card, and then the external memory card storing the authentication key is inserted into the dedicated receiver. You can issue a key.

At this time, in performing the authentication procedure according to FIG. 7, the time information may be checked in advance in time information set in a dedicated receiver, but the time information is included in the terrestrial DMB signal in order to prevent manipulation by the user. You can also set it to send.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, by comparing the validity period of the authentication key stored in the receiver in advance and performing authentication for the reception of the paid terrestrial DMB signal, the receiver has a simpler structure than the conventional CAS method. It can be designed to reduce the size of the receiver, and the authentication can be performed using the software and the public key encryption authentication key mounted on the receiver, it is possible to improve the security.

In addition, if the external memory card is set to be equipped with an authentication key, a user using various receivers (for example, a DMB terminal and a car TV) can register a service and provide paid terrestrial DMB service by selecting a receiver according to various situations. There is an effect to receive.

Claims (19)

An authentication method in a terrestrial DMB receiver for watching a terrestrial digital multimedia broadcasting (DMB) broadcast, (a) receiving a terrestrial DMB signal; (b) checking transmitter identification information (TII) included in the terrestrial DMB signal; (c) if the terrestrial DMB signal is received through the check of the TII, the terrestrial DMB signal is transmitted through a repeater, wherein the repeater transmits the terrestrial DMB signal for a fee in a shadowed area; Confirming information of an authentication key stored in advance; And (d) checking the paid terrestrial DMB broadcast if the authentication key is a valid authentication key as a result of confirming the information of the authentication key; Paid terrestrial DMB signal authentication method comprising a. The method of claim 1, wherein step (b) Pay- terrestrial DMB signal authentication method, characterized in that by analyzing the transmission frame of the terrestrial DMB signal, the TII included in the synchronization channel of the transmission frame. The transmission frame of the terrestrial DMB signal, A synchronization channel including a TII for transmitting the terrestrial DMB signal and a phase reference symbol for frame synchronization, carrier frequency synchronization, channel state estimation and demodulation function; A fast information channel including a plurality of fast information channel (FIC) symbols including multiplex configuration information, service information, fast information data channel, and reception restriction information; And A main service channel including a main service channel (MSC) symbol for transmitting audio data and video data of the terrestrial DMB broadcast. Paid terrestrial DMB signal authentication method comprising a. The method according to claim 2, wherein the TII, A paid terrestrial DMB signal authentication method comprising a 7-bit primary ID and a 5-bit secondary ID. The method of claim 1, wherein step (c) comprises: In step (b), if the terrestrial DMB signal is a terrestrial DMB signal transmitted from a transmitter located on the ground, the terrestrial DMB signal is received without performing the step of checking the authentication key information. Paid terrestrial DMB signal authentication method, characterized in that. The method of claim 1, wherein step (d) Checking whether the authentication key is valid is determined by comparing the validity period information stored in the authentication key and the current time information provided by the receiver. The method of claim 6, wherein the current time information, When the receiver is a mobile communication terminal, time information transmitted from a mobile communication network is used, and when the receiver is a dedicated terminal that does not include a communication function, pay terrestrial wave, wherein the time information set in the receiver is used. DMB signal authentication method. The method of claim 6, wherein the current time information, The pay terrestrial DMB signal authentication method comprising transmitting the current time information to the terrestrial DMB signal. The method of claim 1, wherein step (d) And a message indicating that the paid terrestrial DMB broadcast cannot be received if the authentication key is an invalid authentication key as a result of checking the authentication key information. The method of claim 1, wherein the authentication key in step (c), (A) receiving a request for providing a paid terrestrial DMB broadcast to the terrestrial DMB receiver through a wired or wireless Internet; (B) receiving subscriber information of the terrestrial DMB receiver and generating a subscriber information database; (C) generating an authentication key to be provided to the terrestrial DMB receiver, and storing authentication information of the authentication key in the subscriber information database; and (D) transmitting the authentication key generated to the terrestrial DMB receiver; Paid terrestrial DMB signal authentication method, characterized in that issued by the relay network operator operating the repeater by an authentication key issuing method comprising a. The method of claim 10, wherein step (c) comprises: Paid terrestrial DMB signal authentication method characterized by generating the authentication key using a public key encryption (Security) method for security. The method of claim 10, The authentication information includes the number of the terrestrial DMB receiver, the date of creation or update of the authentication key, and the validity period of the authentication key, wherein the authentication key transmitted through step (d) includes at least information on the validity period. Paid terrestrial DMB signal authentication method characterized in that it is included. The method of claim 10, wherein step (d) comprises If the terrestrial DMB receiver is a mobile communication terminal, the terrestrial DMB signal authentication method of paying, characterized in that the transmission using a short message (SMS) or multimedia message (MMS). The method of claim 10, wherein step (d) comprises When the terrestrial DMB receiver is a dedicated terminal that does not include a communication function, after transmitting the authentication key to another communication medium (computer, mobile communication terminal), the terrestrial DMB receiver transmits the authentication key by using a cable or an external memory card. Paid terrestrial DMB signal authentication method characterized in that the transmission to the DMB receiver. A terrestrial DMB receiver for displaying terrestrial digital multimedia broadcasting (DMB) broadcasting, Terrestrial DMB for terrestrial DMB broadcasting transmitted from a terrestrial DMB signal, wherein the transmitter transmits a free terrestrial DMB signal; or b, a repeater located in a shaded area; A DMB antenna for receiving a signal; A data storage unit for storing software for analyzing the terrestrial DMB signal and displaying the terrestrial DMB broadcast; An authentication processing unit for determining whether a previously stored authentication key is valid for displaying a paid terrestrial DMB broadcast transmitted from the repeater and performing an authentication procedure; An LCD (Liquid Crystal Display) display unit displaying the terrestrial DMB broadcast; A speaker for outputting a voice portion of the terrestrial DMB broadcast; And Call the software of the data storage unit, check the TII of the repeater or the transmitter, and if the terrestrial DMB signal is a signal transmitted from a repeater, perform an authentication procedure through the authentication processing unit, and perform the terrestrial DMB through the LCD display unit. Microprocessor controls a series of tasks to display a broadcast Terrestrial DMB receiver comprising a. The method of claim 15, wherein the terrestrial DMB receiver, A key input unit including a key button for watching the terrestrial DMB broadcast; And Connected to an external device connected to an external device to perform data transmission / reception Terrestrial DMB receiver, characterized in that it further comprises. The method of claim 16, wherein the authentication key, And an external memory card connected to the data storage unit, the authentication processing unit, or the additional device connection unit. In the repeater is installed in the shadow area, for transmitting the terrestrial DMB signal of charge to the terrestrial DMB receiver located in the shadow area, A transmission frame generator for converting the terrestrial DMB signal into a symbol signal including a null symbol, a phase reference symbol, a fast information channel (FIC) symbol, and a main service channel (MSC) symbol according to each transmission frame; An OFDM signal generator configured to generate an OFDM terrestrial DMB signal by performing orthogonal frequency division multiplexing (OFDM) modulation on the symbol signal converted through the transmission frame generator; A TII signal generator for generating transmitter identification information (TII) assigned as a unique number of the repeater; A summer for generating a pay terrestrial DMB signal by inserting a TII received from the TII signal generator at a null symbol position of the OFDM terrestrial DMB signal; And An amplifier converts the pay terrestrial DMB signal into a plurality of terrestrial DMB receivers located in a region in which the repeater is in charge through an antenna. Repeater for transmitting the terrestrial DMB signal of the pay. In the terrestrial DMB receiver for watching a terrestrial digital multimedia broadcasting (DMB) broadcast, A receiver for receiving a terrestrial DMB signal; A TII identification unit for identifying TII (transmitter identification information) included in the terrestrial DMB signal; Upon confirmation of the TII, when the terrestrial DMB signal receives a terrestrial DMB signal for a fee through a repeater, where the repeater transmits the terrestrial DMB signal for a fee in a shaded area, the terrestrial DMB signal is stored in advance in the terrestrial DMB receiver. An authentication unit which checks the information of the authentication key; And A control unit for viewing the paid terrestrial DMB broadcasting when the authentication key is a valid authentication key as a result of confirming the information of the authentication key Terrestrial DMB receiver comprising a.

Images