DVB-T2 Control Information Transmission via Primary Service Data Channel
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Solution Overview
Problem
In broadcast communication systems, particularly with DVB-T2, there is a need for an efficient method to transmit and receive control information during service changes, as existing methods are susceptible to interference and require re-acquisition of control information, leading to increased zapping times when switching between services.
Innovation Solution
The proposed solution involves a new frame configuration where control information is transmitted independently of signal P2 using a time division scheme, grouping services into primary and non-primary categories, with primary services carrying control information for all services, allowing for efficient acquisition and reduction of zapping times during service changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted through signal P2 in each frame, then control information is available for each service, but the receiver must re-acquire control information during service changes, increasing zapping time
Solution Approach 1:
The control information for the target service is transmitted in advance through the current service's data channel before the service change occurs. This preliminary transmission allows the receiver to acquire the necessary control information without waiting for signal P2 in the next frame, thereby reducing zapping time while maintaining control information availability.
2Ease of operation
If control information is transmitted separately in signal P2, then control information can be read independently, but the receiver must demodulate signal P2 to acquire control information for service changes
Solution Approach 1:
The control information for the target service is merged into the data channel of the current service being received. This allows the receiver to acquire control information as a byproduct of receiving the current service, eliminating the need for separate signal P2 demodulation and reducing service change time while maintaining independent control information access.
3Adaptability or versatility
If all services are transmitted through multiple RFs with cyclic shifting, then service diversity is improved, but the frame configuration becomes more complex
Solution Approach 1:
Services are segmented into primary services and non-primary services. Primary services are transmitted through multiple RFs with cyclic shifting to provide diversity, while non-primary services are transmitted only in the frame where they first appear. This segmentation maintains service transmission flexibility while simplifying the overall frame configuration by reducing the number of services that require complex multi-RF transmission.
Data Source
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AI summary
Method of transmitting control information in a DVB-T2 communication system, comprising: generating a plurality of frames based on a plurality of broadcast services including a primary broadcast service and at least one other broadcast service; and transmitting the plurality of frames, each frame comprising a control part including a P2 signal and a data part including at least one TDM channel carrying a broadcast service, the P2 signal in a first frame including first control information for at least one broadcast service included in the first frame, wherein a primary TDM channel carrying the primary broadcast service in the first frame includes service data of the primary broadcast service, second control information including first service control information for the primary broadcast service included in a second frame following the first frame, and second service control information for broadcast services other than the primary broadcast service included in the second frame.