Conditional access system for each transmitter in single frequency network, and a method thereof
First Claim
1. A conditional access system for a transmitter in a single frequency network for terrestrial and satellite digital broadcasting, the conditional access system comprising:
- a main broadcasting system configured to transmit encoded signals including a data stream and a main broadcasting system transmitter identification information (TII) value through a main broadcasting network;
a repeating system configured to;
amplify and transmit the encoded signals of the main broadcasting network, or modulate and amplify a stream input by the main broadcasting system through a private line,allocate a repeating system TII value to be different from the main broadcasting system TII value, andrepeat the broadcasting signals, including the encoded signals of the main broadcasting network, through a repeating network, wherein the repeating system extracts the main broadcasting system TII value and inserts the repeating system TII value in the broadcasting signals when repeating the broadcasting signals;
a subscriber station configured to decode the encoded signals of the main broadcasting network included in the broadcasting signals received through the main broadcasting network or the repeating network, transmitter identification information (TII), and an encoding key; and
a decoding key provider configured to authenticate a user and transmit a decoding key to a charged subscriber station through a mobile communication network, wherein;
the charged subscriber station is in the repeating network coverage, andthe charged subscriber station is configured to store the decoding key transmitted from the decoding key provider and decode the broadcasting signals using the decoding key corresponding to the repeating system TII value.
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Accused Products
Abstract
The conditional access system in a single frequency network in a digital broadcasting system includes a main broadcasting system transmitting encoded broadcasting signals including a data stream and transmitter identification information (TII) through a main broadcasting network; a repeating system amplifying and transmitting encoded broadcasting signals of the main broadcasting network, or modulating and amplifying a stream input by the main broadcasting system through a cable, and repeating broadcasting signals of the main broadcasting system through a repeating network; a subscriber station decoding the encoded signals of the main broadcasting network included in the broadcasting signals received through the main broadcasting network or the repeating network, TII, and an encoding key according to a decoding method; and a decoding key provider receiving a decoding key from the main broadcasting or repeating system, authenticating a user, and transmitting the decoding key to a charged subscriber station through a mobile communication network.
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Citations
33 Claims
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1. A conditional access system for a transmitter in a single frequency network for terrestrial and satellite digital broadcasting, the conditional access system comprising:
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a main broadcasting system configured to transmit encoded signals including a data stream and a main broadcasting system transmitter identification information (TII) value through a main broadcasting network; a repeating system configured to; amplify and transmit the encoded signals of the main broadcasting network, or modulate and amplify a stream input by the main broadcasting system through a private line, allocate a repeating system TII value to be different from the main broadcasting system TII value, and repeat the broadcasting signals, including the encoded signals of the main broadcasting network, through a repeating network, wherein the repeating system extracts the main broadcasting system TII value and inserts the repeating system TII value in the broadcasting signals when repeating the broadcasting signals; a subscriber station configured to decode the encoded signals of the main broadcasting network included in the broadcasting signals received through the main broadcasting network or the repeating network, transmitter identification information (TII), and an encoding key; and a decoding key provider configured to authenticate a user and transmit a decoding key to a charged subscriber station through a mobile communication network, wherein; the charged subscriber station is in the repeating network coverage, and the charged subscriber station is configured to store the decoding key transmitted from the decoding key provider and decode the broadcasting signals using the decoding key corresponding to the repeating system TII value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A conditional access subscriber station for a transmitter in a single frequency network for terrestrial and satellite digital broadcasting, the conditional access subscriber station comprising:
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an OFDM demodulator configured to select a channel when encoded broadcast signals are received through an antenna, and convert the encoded broadcast signals into OFDM signals; a transmitter identification information (TII) extractor configured to extract a TII signal and an encoded key from the OFDM signals; a key table configured to search for a key value according to stored TII values; a DAB de-ensembler configured to divide the OFDM signals into DAB data and MPEG2 TS data signals; a network identification (NIS) decoder configured to combine three keys, namely a main broadcasting station TII key, repeater station TII key, and a decoding key, for decoding the encoded broadcasting signals according to the TII values by using the key table or an ID of a subscriber station, and decode the MPEG2 TS data signals output by the DAB de-ensembler; and a multimedia processing module for processing the decoded MPEG2 TS data or DAB data to be displayable, wherein the subscriber station of a charged subscriber identifies whether the encoded broadcast signals are from a main broadcasting network or a repeating network by using the TII values, decodes the encoded broadcast signals by using a main broadcasting station TII value when the encoded broadcast signals are from the main broadcasting network, and decodes the broadcast signals by using the decoding key received through a mobile communication network when the encoded broadcast signals are from the repeating network. - View Dependent Claims (25)
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26. A conditional access method for a transmitter by a charged subscriber in a single frequency network for terrestrial and satellite digital broadcasting, the conditional access method comprising:
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a) a charged subscriber receiving broadcasting signals including a data stream and transmitter identification information (TII); b) searching a TII key table to find a corresponding key value depending on the cases of a receiver for exclusive use and a wireless communication combined receiver; c) applying; main broadcasting network TII or repeating network TII, and an encoding key value so as to descramble the data stream; d) checking whether the data stream can be descrambled and decoded; e) the charged subscriber receiving a decoding key through a mobile communication network when the data stream cannot be descrambled and decoded; and f) decoding the data stream and receiving broadcasting signals when the data stream can be decoded, wherein the charged subscriber decodes the data stream using the decoding key corresponding to repeating network TII; wherein f) further comprises scrambling and decoding, with the charged subscriber, the data stream by using the TII and the encoding key in the main broadcasting network, and identifying, with the charged subscriber, the main broadcasting network and the repeating network by using the TII to identify the network received by the current terminal by using the TII in the repeating network and descrambling and decoding the data stream by using the decoding key received through the mobile communication network. - View Dependent Claims (27)
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28. A conditional access method for a transmitter by an uncharged subscriber in a single frequency network for terrestrial and satellite digital broadcasting, the conditional access method comprising:
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a) an uncharged subscriber receiving broadcasting signals including a data stream and transmitter identification information (TII); b) using the TII as a key value so as to descramble the data stream; c) checking whether the data stream can be descrambled and decoded; d) decoding the data stream and receiving the broadcasting signals when the data stream can be decoded; and e) conditionally controlling receiving of the broadcasting signals when the uncharged subscriber'"'"'s terminal is handed off from the main broadcasting network to the repeating network, wherein e) further comprises periodically modifying, with an encoding server in the main broadcasting system, the TII of the main broadcasting system which is used by the uncharged subscriber to identify whether the broadcasting signals are from the main broadcasting network and decoding the broadcasting signals, and applying the TII as modified to scrambling of the data stream, and hence the uncharged subscriber is controlled to conditionally receive the broadcasting signals. - View Dependent Claims (29, 30, 31, 32)
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33. A conditional access system for a transmitter in a single frequency network for terrestrial and satellite digital broadcasting, the conditional access system comprising:
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a main broadcasting system configured to encode broadcasting signals including a data stream and transmitter identification information (TII) through a main broadcasting network; a repeating system configured to; amplify and transmit encoded broadcasting signals of the main broadcasting network, or modulate and amplify a stream input by the main broadcasting system through a private line, allocate a repeating system TII value to be different from the main broadcasting system TII value, and repeat broadcasting signals of the main broadcasting system through a repeating network; and a decoding key provider configured to authenticate a user and transmit the decoding key to a charged subscriber station through a mobile communication network, wherein the decoding key corresponds to the repeating system TII value, wherein the repeating system extracts the main broadcasting system TII included in the broadcasting signals of the main broadcasting system and inserts the repeating system TII value, which is different from the main broadcasting system TII value when repeating the broadcasting signals of the main broadcasting system.
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Specification