Broadcast IP Packet Framing with Selective Header Compression
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Solution Overview
Problem
The conventional 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
The proposed method involves generating frames with both compressed and uncompressed IP packets, where compressed packets have headers with specification information and uncompressed packets include reference clock information, allowing for faster identification of IP data flows based on header compression status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If header compression is performed on all IP packets to reduce processing overhead, then processing efficiency is improved, but the ability to quickly identify IP data flows without receiving full headers is lost
Solution Approach 1:
The patent segments IP packets into two types: compressed IP packets (with header compression for efficiency) and uncompressed IP packets (with full headers for quick identification). This segmentation allows the reception apparatus to use uncompressed packets for rapid channel selection while using compressed packets for normal data transmission, resolving the contradiction between processing efficiency and identification speed.
Solution Approach 2:
The patent applies different header compression characteristics to different packet types based on their specific needs. Uncompressed IP packets maintain full headers for identification purposes, while compressed IP packets use reduced headers for efficiency. This local differentiation of quality allows simultaneous optimization of both identification speed and processing efficiency.
2Measurement precision
If full headers are transmitted for all IP packets to enable complete data flow identification, then identification accuracy is improved, but processing delay in channel selection increases
Solution Approach 1:
The patent segments IP packets into uncompressed packets (with full headers for accurate identification) and compressed packets (with reduced headers for speed). By maintaining a subset of uncompressed packets, the reception apparatus can accurately identify IP data flows without requiring all packets to have full headers, thus reducing processing delay while preserving identification accuracy.
Solution Approach 2:
The transmission apparatus preliminarily prepares and transmits uncompressed IP packets with full headers before channel selection is needed. These pre-prepared packets enable the reception apparatus to quickly and accurately identify IP data flows without waiting for decompression or additional data, thereby reducing channel selection processing delay while maintaining identification accuracy.
3Loss of energy
If IP packets are compressed to reduce transmission overhead, then bandwidth efficiency is improved, but the complexity of handling different packet types at the reception end increases
Solution Approach 1:
The patent segments IP packets into compressed and uncompressed types, allowing the reception apparatus to handle them through a single unified process that branches based on packet type. This segmentation approach manages complexity by providing clear differentiation between packet types rather than attempting to handle all packets uniformly, making the reception processing more manageable despite the dual-type system.
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.