Conditional Access for Single Frequency Network Transmitters
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Solution Overview
Problem
In digital broadcasting systems, the lack of secure conditional access mechanisms for transmitters in single frequency networks hinders the activation of repeater business and the extension of broadcasting networks, as well as the control of subscriber access to services within overlapping coverage areas.
Innovation Solution
A conditional access system for transmitters in single frequency networks that includes a main broadcasting system for encoding and transmitting signals with transmitter identification information, a repeater system for amplifying and repeating these signals, and a subscriber station for decoding and authenticating users using a decoding key, ensuring secure access and differentiated service delivery based on subscriber types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a repeater system is introduced to service shade areas in single frequency network, then coverage area is expanded, but unauthorized access and service control become more difficult
Solution Approach 1:
The patent segments the broadcasting service into different types (first broadcasting service and second broadcasting service) with distinct conditional access systems. The repeater system is separated from the main broadcasting system, allowing independent control and access management for each service type while expanding coverage area.
Solution Approach 2:
The patent applies different conditional access control mechanisms to different regions and service types. The main broadcasting system uses one access control method while the repeater system uses another, allowing tailored security and access control for each local area based on specific requirements.
2Reliability
If conditional access system is implemented for each transmitter, then subscriber access control is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal conditional access control framework that can be applied to both the main broadcasting system and the repeater system. The same basic access control principles and subscriber management mechanisms are used across both systems, reducing overall system complexity while maintaining effective access control.
3Productivity
If repeater service is provided as charged service, then business activation is enabled, but subscriber management complexity increases
Solution Approach 1:
The patent segments subscriber management into separate processes for different service types. Charged subscribers are managed through the repeater system's conditional access control, while free subscribers access the main broadcasting system directly. This segmentation enables business activation without overcomplicating subscriber management.
Data Source
AI summary
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.