Baseband Frame Header Segmentation for Broadcast Signal Overhead
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Solution Overview
Problem
Current digital broadcast systems face inefficiencies in data transmission due to high overhead in BB frame headers, limited flexibility in mobile reception, and the need for improved error checking and additional functionality like in-band signaling.
Innovation Solution
A new baseband frame structure is defined with a stuffing field for padding, error checking through a checksum field, and specific bit allocations for control information, allowing for reduced overhead, added functions, and enhanced error checking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a traditional BB frame header structure is used, then the header can include necessary control information, but the overhead for BB frame transmission becomes excessive
Solution Approach 1:
The BB frame header is segmented into multiple fields with specific functions: SYNCD field for synchronization, PKTSPTR field for packet start pointer, and EXT field for extension information. This segmentation allows each field to carry only the necessary information, reducing overall header overhead while maintaining functionality
Solution Approach 2:
The patent changes the parameter structure of the header by using variable-length fields and optional extension fields. The EXT field can be dynamically included or excluded based on whether additional information is needed, allowing the header size to adapt to actual requirements rather than always occupying maximum space
2Adaptability or versatility
If the BB frame header includes all necessary control information and extension fields, then functionality is enhanced, but the header size increases reducing transmission efficiency
Solution Approach 1:
The BB frame header structure is made dynamic through the EXT (extension) field which can be conditionally included. When additional control information or in-band signaling is needed, the EXT field is inserted between the PKTSPTR and payload fields. When not needed, the header remains compact without the extension field, thus adapting the header size to actual functional requirements
3Reliability
If error checking functions are added to the BB frame, then transmission reliability is improved, but overhead increases
Solution Approach 1:
The error checking function is extracted as a separate CRC (Cyclic Redundancy Check) field that can be independently added to the BB frame header. The CRC field contains a specific number of bits dedicated solely to error detection, separated from the main control information fields. This extraction allows error checking capability to be added without interfering with the structure of existing control fields, and the CRC field size can be optimized based on required reliability levels
Data Source
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AI summary
Disclosed is a method for transmitting broadcast signals, including: formatting input streams to a plurality of data pipes (DPs), wherein the formatting comprises allocating data packets to a payload of a baseband frame (BBF), and adding a header indicating a format of the payload of the baseband frame, and the header comprises at least one of first control information and second control information.