ROHC Header Compression for Broadcast IP Packet Efficiency
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Solution Overview
Problem
Current digital broadcast systems face inefficiencies in data transmission due to high overhead from IP packet headers, particularly in large data transmissions, requiring enhanced network flexibility and robustness for mobile reception.
Innovation Solution
The implementation of a method for efficiently compressing and decompressing IP packet headers using a robust header compression (ROHC) scheme, involving adaptation modes for different packet types and context information management, to reduce complexity and bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If IP packet headers are transmitted without compression in digital broadcast systems, then data transmission can proceed with standard protocols, but overhead increases and bandwidth efficiency decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting header compression parameters based on packet type and context. Different compression schemes are applied to different packet types (e.g., real-time vs. non-real-time packets), and context information is maintained and updated to optimize compression ratios while adapting to changing transmission conditions.
Solution Approach 2:
The patent segments the header compression process into distinct stages: context establishment, context maintenance, and context update. Different compression methods are applied to different portions of headers based on their variability, and context information is segmented into static and dynamic components for efficient management.
2Loss of energy
If robust header compression (ROHC) is applied to all IP packets, then bandwidth efficiency improves, but processing complexity and decompression time increase
Solution Approach 1:
The patent applies partial action by selectively applying ROHC compression only to packets that benefit from it, rather than all packets. Real-time packets with predictable headers receive full compression, while non-real-time packets or packets with highly variable headers may use simpler compression or no compression, reducing overall processing overhead.
Solution Approach 2:
The patent introduces dynamics by adapting the compression strategy based on packet characteristics and transmission conditions. The system dynamically switches between different compression modes (e.g., from full ROHC to simpler compression) based on factors like packet type, header variability, and network conditions, optimizing the balance between compression ratio and processing speed.
3Adaptability or versatility
If IP fragmentation is performed to optimize data transmission, then larger data can be transmitted over networks with smaller MTU, but processing complexity and overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating fragmentation parameters and pre-establishing context information for fragmented packets. The fragmentation strategy is determined in advance based on packet size and network MTU, and context is prepared ahead of time to enable efficient decompression of fragmented packets without increasing real-time processing complexity.
4Loss of energy
If context information is maintained for all packet types in ROHC, then compression efficiency improves, but memory requirements and processing overhead increase
Solution Approach 1:
The patent applies local quality by maintaining context information with different levels of detail for different packet types and transmission scenarios. Real-time packets with predictable patterns maintain full context, while other packets use reduced context or context-on-demand, optimizing the balance between compression efficiency and memory usage for each specific case.
Data Source
AI summary
A broadcast signal transmission method comprises outputting an RoHC channel that includes one or more RoHC streams and a signaling table that includes information related to header compression by performing header compression for Internet Protocol (IP) packets, which include broadcast data, in accordance with an adaptation mode, a header of each IP packet including an IP header and a User Datagram Protocol (UDP) header, generating at least one first link layer packet that includes the RoHC channel and generating at least one second link layer packet that includes the signaling table, and physical layer processing the at least one first link layer packet and the at least one second link layer packet and transmitting through one or more Physical Layer Pipes (PLPs), wherein the signaling table includes adaptation mode information indicating the adaptation mode, and each RoHC stream in the RoHC channel includes RoHC packets.