Communication Terminal Header Compression Refresh for Broadcast Media
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Solution Overview
Problem
In broadcast communication systems, especially those using mobile terminals, there is a challenge in reducing overhead transmission capacity and associating physical and logical addresses, leading to difficulties in quick reproduction of broadcast media and reliable playback, particularly when header compression methods fail to recover compression states and multiple wireless channels are involved.
Innovation Solution
A communication system where a terminal acquires reproduction information before playback, including layout and timing information, and associates physical and logical addresses, allowing immediate reproduction even when starting from halfway through a broadcast, using header compression refresh packets and notification messages like SAP or H.245 to ensure quick and efficient media delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If header compression methods are used to reduce overhead, then transmission capacity is improved, but reliability of playback is worsened when compression state cannot be recovered
Solution Approach 1:
The system transmits a header compression refresh packet before the actual broadcast media to re-establish the header compression state. This preliminary action ensures that when the broadcast media is received, the compression state is already restored, allowing reliable playback even if the previous compression state was lost.
2Speed
If broadcast media is transmitted immediately after notification, then reproduction speed is improved, but playback reliability is worsened when header compression state is unclear
Solution Approach 1:
The system inserts a header compression refresh packet between the broadcast notification information and the broadcast media. This preliminary action restores the header compression state before the media is transmitted, enabling both immediate reproduction and reliable playback without waiting for state recovery.
3Adaptability or versatility
If multiple wireless channels are used for broadcast, then adaptability is improved, but difficulty in associating physical and logical addresses increases
Solution Approach 1:
The system introduces a correspondence relationship table as an intermediary data structure that stores the association between physical channels and logical channels. This table acts as a mediator, allowing the terminal to correctly map physical channel information to logical channel information, thereby resolving the difficulty in address association while maintaining multi-channel adaptability.
4Reliability
If reproduction information is acquired before playback, then playback reliability is improved, but transmission time is increased
Solution Approach 1:
The system transmits reproduction information (including layout information and timing information) as part of the header compression refresh packet before the broadcast media. This preliminary transmission of essential information allows the terminal to prepare for reliable playback immediately upon receiving the media, without significant time delay.
Data Source
AI summary
An apparatus and associated methodology provided to enable broadcast media to be reproduced quickly while reducing an overhead accompanied with the broadcast media. A broadcast communication system transmits the broadcast media from a server to a communication terminal. The server transmits broadcast notification information (SAP message) designating at least one broadcast media, and transmits reproduction information indicating a reproduction method of the designated broadcast media prior to reproduction of the broadcast media by the communication terminal. The communication terminal reproduces the broadcast media designated by the broadcast notification information (SAP message) based on the reproduction information when receiving the broadcast notification information.