System For Transmitting The Scrambled Broadcast-Signals In Single Frequency Network, And A Method Thereof

• US 20100177895A1
• Filed: 11/04/2005
• Published: 07/15/2010
• Est. Priority Date: 03/24/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, KT Corporation
• Original Assignee: KT Corporation
• Inventors: Lee, Hyun, Lee, Soo-In, Lim, Jong-Soo, Lee, Bong-Ho, Chae, Tae-June, Park, Won-Jin, Lee, Gwang-Soon, Hong, Chung-Pyo
• Granted Patent: US 8,619,987 B2
• Time in Patent Office: Days
• US Class Current: 380/270
• CPC Class Codes: H04H 20/06 among broadcast stations
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04H 60/21 Billing for the use of broadcast information or broadcast-related information
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/25875 involving end-user authentication restricting access to computer systems by authenticating users using a predetermined code G06F21/33; arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• CPC Class Codes: H04N 7/165 Centralised control of user terminal subsequent to an upstream request signal H04N7/17345; Registering at central by two-way working H04N7/17309

Abstract

Disclosed is a system for transmitting encrypted broadcast signals to different transmitters on a single frequency network (SFN) in a digital broadcasting system. The system for transmitting encrypted broadcast signals on the SFN includes: a main broadcasting system for transmitting encrypted broadcast signals including data streams and transmitter identification information (TII) through a main broadcasting network; a repeating system for amplifying encrypted broadcast signals of the main broadcasting network and transmitting the amplified broadcast signals, or modulating and amplifying streams input by the main broadcasting system through a private line and repeating broadcast signals of the main broadcasting system through a repeating network; and a decrypting key provider for receiving a decrypting key value from the main broadcasting or repeating system and transmitting a user authentication and decrypting key to a charged subscriber terminal through a mobile communication network.

Claims

1. In a system for transmitting broadcast signals on a single frequency network (SFN) for terrestrial and satellite digital broadcasting, a system for transmitting encrypted broadcast signals on the SFN, comprising:

a main broadcasting system for transmitting encrypted broadcast signals including data streams and transmitter identification information (TII) through a main broadcasting network;

a repeating system for amplifying encrypted broadcast signals of the main broadcasting network and transmitting the amplified broadcast signals, or modulating and amplifying streams input by the main broadcasting system through a private line and repeating broadcast signals of the main broadcasting system through a repeating network; and

a decrypting key provider for receiving a decrypting key value from the main broadcasting or repeating system and transmitting a user authentication and decrypting key to a charged subscriber terminal through a mobile communication network.

2. The system of claim 1, wherein the main broadcasting system comprises:

a service multiplexer for multiplexing audio, data, and video data respectively provided by a contents provider with related additional information;

a system multiplexer for multiplexing the data multiplexed by the service multiplexer into broadcast signals in a transmission frame format;

an encryptor for encrypting the broadcast signals transmitted by the system multiplexer;

an encrypting key generator for generating an encrypting key from the system multiplexer;

a main broadcasting station TII inserter for inserting transmitter identification information (TII) to the encrypted broadcast signals;

a modulator for modulating the encrypted broadcast signals and the inserted main broadcasting station TII; and

a transmitter for transmitting the modulated broadcast signals to a subscriber through a main broadcasting network.

3. The system of claim 1, wherein the main broadcasting system scrambles multimedia programs or contents and transmits a decrypting key for decrypting the broadcast signals according to a predetermined encrypting method.

4. The system of claim 1, wherein the main broadcasting system and the repeating system respectively transmit transmitter identification information (TII) for determining by the subscriber terminal whether the transmitted broadcast signals are main broadcasting network signals or repeating network signals.

5. The system of claim 1, wherein the main broadcasting system periodically modifies transmitter identification information (TII) of the main broadcasting system, and applies the modified TII when corresponding encrypting is performed.

6. The system of claim 1, wherein the main broadcasting system applies transmitter identification information (TII) as a key value of transmission streams and enables conditional access to the respective transmitters, the TII being used for receiving different values from transmitters on a single frequency network (SFN).

7. The system of claim 1, wherein the repeating system reallocates a TII value of the repeating system which is different from the TII value of the main broadcasting system and transmits the TII value of the repeating system when repeating the data stream of the main broadcasting system.

8. The system of claim 1, wherein the decrypting key provider periodically transmits the decrypting key to a charged subscriber terminal through a mobile communication network or the Internet.

9. In a method for transmitting broadcast signals on a single frequency network (SFN) for terrestrial and satellite digital broadcasting, a method for transmitting encrypted broadcast signals on the SFN comprising:

a) a system multiplexer of a main broadcasting station multiplexing service multiplexed data into broadcast signals;

b) encrypting the broadcast signals and generating an encrypting key;

c) inserting transmitter identification information (TII) to the encrypted broadcast signals so that a subscriber terminal may determine whether the encrypted broadcast signals are transmitted through a main broadcasting network or a repeating network;

d) transmitting the encrypted broadcast signals to an uncharged or to charged subscriber through the main broadcasting network; and

e) providing a decrypting key of the encrypted broadcast signals to a mobile communication system through a mobile communication network or a private line.

10. The method of claim 9, further comprising the main broadcasting station periodically modifying the main broadcasting station TII, applying the modified main broadcasting station TII to scramble broadcast signals, and transmitting the encrypted broadcast signals.

11. The method of claim 9, further comprising the mobile communication system transmitting a decrypting key for decrypting the encrypted broadcast signals according to a request by the charged subscriber terminal.