Broadcast IP Header Compression for Faster Channel Selection
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Solution Overview
Problem
The existing MMT scheme for broadcasting systems experiences processing delays in channel selection due to the need to receive full headers before identifying desired IP data flows, especially when long transmission intervals are involved.
Innovation Solution
A transmission method that generates frames with both compressed and uncompressed IP packets, where compressed packets have headers for filtering and uncompressed packets include reference clock information, allowing for faster identification of IP data flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If header compression is performed on all IP packets to reduce data volume, then transmission efficiency is improved, but the reception apparatus cannot quickly identify IP data flows requiring full header analysis
Solution Approach 1:
The patent segments IP packets into two categories: those with compressed headers and those with full headers. The reception apparatus can quickly identify and process packets with full headers to extract reference clock information, while packets with compressed headers are processed after header decompression. This segmentation allows parallel processing paths that reduce overall channel selection delay.
Solution Approach 2:
The patent performs preliminary action by including some IP packets with full (uncompressed) headers in the transmission stream. These packets are prepared in advance to contain both the reference clock information and complete header data, enabling the reception apparatus to immediately identify and extract timing information without waiting to decompress headers from other packets.
2Reliability
If full IP headers are transmitted for all packets to enable complete information access, then reference clock information can be reliably extracted, but data transmission volume increases and efficiency decreases
Solution Approach 1:
The patent applies local quality by transmitting full headers only for specific IP packets that carry reference clock information, while using compressed headers for other packets. This localized application of full headers ensures reliable extraction of timing information where needed, while maintaining high transmission efficiency for the majority of data packets through compression.
3Measurement precision
If the reception apparatus waits to receive complete header information before identifying IP data flows, then accurate flow identification is achieved, but channel selection time increases
Solution Approach 1:
The patent prepares packets with full headers in advance and includes them periodically in the transmission stream. This preliminary action ensures that the reception apparatus can immediately identify IP data flows and extract reference clock information without delay, while maintaining accurate flow identification through complete header analysis.
Data Source
AI summary
A transmission method includes: generating a frame for transfer which stores one or more first internet protocol (IP) packets storing content, and one or more second IP packets each including reference clock information which indicates a time for a playback of the content; and transmitting the generated frame through broadcasting. In the generating, header compression is performed on the one or more first IP packets and the header compression is not performed on the one or more second IP packets.