Physical Layer Frame Channel Selection Information Mapping
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Solution Overview
Problem
In broadcasting systems like the ATSC 3.0 standard, there is a need for high-speed channel selection processing and accurate time information transmission, which is hindered by the inefficiencies in transmitting channel selection information and time information due to their positioning within the physical layer frame structure, leading to data discard and synchronization errors.
Innovation Solution
The channel selection information and time information are strategically mapped and transmitted at the beginning of the data portion of the physical layer frame, following the preamble, using methods such as L2 signaling, L2 extension header, and L1 extension header transmission systems, ensuring rapid acquisition and minimizing data loss and synchronization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel selection information and time information are transmitted within the physical layer frame structure, then the information can be included in the broadcast signal, but the transmission efficiency is reduced and data discard occurs
Solution Approach 1:
The patent extracts channel selection information and time information from the conventional physical layer frame structure and transmits them as independent LLS (Low Layer Signaling) packets. This separation allows the broadcast receiver to acquire these critical parameters more efficiently without being constrained by the frame structure, thereby improving channel selection speed while maintaining synchronization accuracy.
Solution Approach 2:
The patent transmits channel selection information and time information in advance as LLS packets before the actual service data. This preliminary transmission enables the broadcast receiver to prepare for channel selection and synchronization operations ahead of time, improving processing efficiency and reducing data discard.
2Quantity of substance
If channel selection information is transmitted later in the physical layer frame, then more data can be transmitted, but channel selection processing time increases
Solution Approach 1:
The patent extracts channel selection information from the physical layer frame structure and transmits it as separate LLS packets. This allows the information to be transmitted independently and more efficiently, reducing the time required for channel selection processing while maintaining adequate data transmission volume through the IP packet-based structure.
Solution Approach 2:
The patent changes the transmission parameter from physical layer frame embedding to LLS packet transmission. This parameter change enables more flexible and efficient transmission of channel selection information, reducing processing time while maintaining data completeness through the IP/UDP packet structure.
3Device complexity
If time information is not accurately transmitted, then transmission complexity is reduced, but synchronization errors occur between transmitter and receiver
Solution Approach 1:
The patent uses LLS packets as an intermediary to transmit time information accurately. The LLS structure provides a standardized and reliable mechanism for conveying timing parameters, ensuring synchronization accuracy between transmitter and receiver without significantly increasing transmission complexity, as the LLS format is already defined in the ATSC 3.0 standard.
Data Source
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AI summary
The present technology relates to a transmission apparatus, a transmission method, a reception apparatus, and a reception method that enable channel selection information and time information to be transmitted effectively. A transmission apparatus acquires channel selection information for selecting a service and time information used for synchronizations on a transmission side and a reception side, generates, as a physical layer frame constituted of a preamble and a data portion, the physical layer frame in which specific information including at least one of the channel selection information and the time information is arranged at a head of the data portion right after the preamble, and transmits the physical layer frame as digital broadcast signals. The present technology is applicable to IP packet broadcasting, for example.