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US 8,014,525 B2Granted
Digital broadcasting transmitting system for conditional access and method thereof, and digital broadcasting receiving terminal and method thereof
AssigneeKTFreetel Co., Ltd.
InventorChung-Pyo Hong
Life of this patent
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Abstract
Disclosed are a conditional access transmission system and method, and a receiving terminal and method. The transmission system transmits scrambled broadcasting signals including a network identification code (NIC) in the digital broadcasting service. A repeating system repeats the broadcasting signals transmitted by the transmission system to a subscriber station. In this instance, the NIC of the repeating system is different from that of a main broadcasting network. A receiving terminal descrambles the scrambled broadcasting signals by using the NIC and a descrambling key. According to the present invention, the charged subscriber can receive broadcasting signals or TPEG messages in the repeating network.
Claims29
A system for transmitting digital broadcasting comprising:
- a main broadcasting system for adding a data packet through a main broadcasting network and a network identification code (NIC) to broadcasting signals, scrambling the broadcasting signals by using a predetermined scrambling key, and outputting scrambled broadcasting signals, wherein the main broadcasting system scrambles the predetermined key by using the NIC and transmits the scrambled key as a descrambling key;
- a repeating system for repeating the scrambled broadcasting signal transmitted by the main broadcasting system through a repeating network, wherein the repeating system adds a second NIC of the repeating network to the scrambled broadcasting signals and the repeating system outputs the modified scrambled broadcasting signals to a subscriber station on the repeating network, the second NIC is different from the NIC of the main broadcasting network and the second NIC is used for representing modified scrambled broadcasting signals outputted from the repeating system;
- and
- a mobile communication system for receiving the descrambling key from the main broadcasting system or the repeating system and transmitting the same to a charged subscriber station wherein the charged subscriber station descrambles the scrambled broadcasting signals by using the NIC extracted from the scrambled broadcasting signals and the descrambling key, the NIC is also used for identifying whether the scrambled broadcasting signal is from the main broadcasting system or the repeating system.
1 more element
A method for transmitting digital broadcasting comprising:
- a) multiplexing additional information related to broadcasting contents and generating a broadcasting signal;
- b) scrambling the generated broadcasting signal by using a predetermined scrambling key, and generating a scrambled broadcasting signal;
- c) inserting a network identification code (NIC) into the scrambled broadcasting signal for identifying the transmission network having transmitted the scrambled broadcasting signal, wherein the transmission network includes a main broadcasting network and a repeating network;
- and
- d) transmitting the scrambled broadcasting signal,
- wherein the predetermined scrambling key is scrambled by the NIC to be thus output as a descrambling key wherein the descrambling key together with the NIC is used to descramble the scrambled broadcasting signal transmitted in d),
- wherein the main broadcasting network adds the NIC of the main broadcasting network to the broadcasting signals and outputs the broadcasting signals to a subscriber station on the main broadcasting network, the NIC is used for decoding the scrambled broadcasting signals outputted from the main broadcasting network in a subscriber station on the main broadcasting network and the NIC is used to represent the scrambled broadcasting signals outputted from the main broadcasting system and the NIC is also used for identifying whether the scrambled broadcasting signal is from the main broadcasting system or the repeating system, and
- wherein the repeating network adds a second NIC of the repeating network to the scrambled broadcasting signals and outputs modified scrambled broadcasting signals to a subscriber station on the repeating network, the second NIC is different from the NIC of the main broadcasting network and the second NIC is used for representing the modified scrambled broadcasting signals outputted from the repeating network.
5 more elements
A terminal for receiving DVB-T (Digital Video Broadcasting-Terrestrial) digital broadcasting comprising:
- a DVB-T demodulator for demodulating a signal received through an antenna according to the DVB-T method and outputting a transmission parameter signaling (TPS) carrier used for transmitting scrambled broadcasting signals and a parameter of transmission data wherein the TPS carrier includes a network identification code (NIC);
- a NIC extractor for extracting the NIC from the TPS carrier output by the DVB-T demodulator;
- a decoder for decoding the scrambled broadcasting signal output by the DVB-T demodulator according to a decoding algorithm by using the NIC extracted from the NIC extractor;
- and
- a multimedia processor for processing the data decoded by the decoder and outputting the data to the user,
- wherein the terminal decodes the scrambled broadcasting signal by using the NIC which is used for identifying whether the scrambled broadcasting signal is from a main broadcasting or a repeating network,
- wherein the main broadcasting network adds a data packet and the NIC of the main broadcasting network, which is used for representing the scrambled broadcasting signals outputted from the main broadcasting network, to a broadcasting signal, scrambles the broadcasting signal by using a predetermined scrambling key, and outputs the scrambled broadcasting signal to the terminal on the main broadcasting network, and
- wherein the repeating network adds a second NIC of the repeating network to the scrambled broadcasting signal and outputs a modified scrambled broadcasting signal to the terminal on the repeating network, the second NIC is different from the NIC of the main broadcasting network and the second NIC is used for representing the modified scrambled broadcasting signal outputted from the repeating network.
5 more elements
A method for receiving, by a terminal, digital broadcasting comprising:
- a) receiving broadcasting signals including a data packet and a network identification code (NIC), wherein the NIC identifies the transmission network having transmitted the broadcasting signals;
- b) demodulating the broadcasting signals to extract the NIC;
- c) analyzing the NIC that is extracted to determine whether the transmission network that transmitted the broadcasting signals that were received is a repeating network;
- and
- d) descrambling and outputting the broadcasting signals by using the NIC and a descrambling key when it is determined that the transmission network that transmitted the broadcasting signal is the repeating network,
- wherein the terminal decodes the broadcasting signal by using the NIC which is used for identifying whether the broadcasting signal is from a main broadcasting network or the repeating network,
- wherein the main broadcasting network adds a data packet and the NIC of the main broadcasting network to a broadcasting signal, scrambles the broadcasting signal by using a predetermined scrambling key, and outputs the scrambled broadcasting signal to the terminal on the main broadcasting network, the NIC is used for representing the broadcasting signals outputted from the main broadcasting network, and
- wherein the repeating network adds a second NIC of the repeating network to the scrambled broadcasting signals and outputs modified scrambled broadcasting signals to the terminal on the repeating network, the second NIC is different from the NIC of the main broadcasting network and the second NIC is used for representing the modified scrambled broadcasting signals outputted from the repeating network.
5 more elements
Dependencies are inferred from the claim text.