Layered Broadcast Transmission With Shared Time Synchronization
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Solution Overview
Problem
Existing technologies for digital terrestrial television broadcasting, such as ISDB-T and next-generation systems, do not provide a method for appropriately transmitting time information necessary for synchronization processes when using a layered division multiplexing system.
Innovation Solution
A transmission device and method that includes generating physical layer control information with time information for synchronization, allowing broadcast signals of different systems to be transmitted in hierarchical layers, with time information included in the physical layer control information of one system to synchronize the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If layered division multiplexing system is used to transmit broadcast signals of different systems, then transmission capacity is improved, but time information for synchronization becomes insufficient
Solution Approach 1:
The patent merges time information from the first broadcast system into the physical layer control information of the second broadcast system. This allows the second system to utilize time information from the first system for synchronization, enabling both systems to coexist in the layered division multiplexing framework without requiring separate time information transmission for each system.
Solution Approach 2:
The physical layer control information of the second broadcast system is designed to serve multiple functions: it carries not only control information for the second system but also time information from the first system. This multi-functional design enables the control information to support synchronization across different broadcast systems within the same frequency band.
2Ease of operation
If physical layer control information is transmitted separately for each broadcast system, then system-specific control is improved, but overall system complexity increases
Solution Approach 1:
The patent combines control information from different broadcast systems into a unified physical layer control information structure. The second system's control information incorporates time information from the first system, creating an integrated control mechanism that reduces redundancy and simplifies the overall system architecture while maintaining system-specific control capabilities.
Data Source
AI summary
There is provided a transmission device, a transmission method, a reception device, and a reception method that enable more appropriate transmission of time information. The transmission device includes: a generation unit that generates physical layer control information included in a physical layer frame; and a transmission unit that transmits the physical layer frame as a broadcast signal to which a layered division multiplexing system is applied, in which a broadcast signal of a first broadcast system is transmitted in a first hierarchical layer of the layered division multiplexing system, and a broadcast signal of a second broadcast system is transmitted in a second hierarchical layer of the layered division multiplexing system, and, of the physical layer control information, first physical layer control information included in the broadcast signal of the first broadcast system includes time information to be used in a synchronization process related to the broadcast signal of the second broadcast system. The present disclosure can be applied to a transmission system compatible with a broadcast system of digital terrestrial television broadcasting, for example.