Header Restoration Channel for eMBMS Bandwidth Efficiency
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Solution Overview
Problem
The existing technologies for Evolved Multimedia Broadcast Multicast Services (eMBMS) over LTE do not enable header compression, leading to inefficient use of downlink bandwidth due to large uncompressed headers, and late joiners miss synchronization information, resulting in incomplete packet decompression.
Innovation Solution
A method of transmitting compressed payload packets on payload channels and header restoration packets on a separate channel, which include channel and packet identification data, and header restoration data to enable late joiners to synchronize and decompress packets effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If header compression is used for eMBMS over LTE, then bandwidth efficiency is improved, but late joiners cannot decompress packets because they miss synchronization information
Solution Approach 1:
The patent applies preliminary action by transmitting full packet headers in advance before compressed payload packets. This allows late joiners to receive the complete header information they need to decompress packets without having to miss initial synchronization packets. The full headers are sent as a preliminary step that enables subsequent compressed packet reception.
Solution Approach 2:
The patent uses an intermediary approach by introducing a dual-channel system: a first channel transmits full packet headers while a second channel transmits compressed payload packets. This intermediary full-header channel acts as a mediator that bridges the gap between compression efficiency and late-joiner compatibility, allowing receivers to obtain necessary synchronization information without restricting access.
2Reliability
If no header compression is used for eMBMS over LTE, then late joiners can receive all packet information, but downlink bandwidth is wasted due to large uncompressed headers
Solution Approach 1:
The patent applies segmentation by dividing header transmission into two separate segments: full packet headers transmitted on a first channel and compressed payload packets transmitted on a second channel. This segmentation allows the system to provide complete header information for reliability while using compression on the payload channel to improve bandwidth efficiency.
Solution Approach 2:
The patent applies local quality by providing different quality levels of header information to different receivers based on their needs. Late joiners receive full headers on the first channel for complete decompression capability, while early joiners can use the compressed format on the second channel, optimizing bandwidth usage for each receiver type.
Data Source
AI summary
A method and system for data transmission is provided. Compressed payload packets are transmitted on one or more payload channels. On a header restoration channel, header restoration packets are transmitted for restoring headers of at least some of the compressed payload packets.