RoHC Compressor Context Release Mechanism
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Solution Overview
Problem
Robust Header Compression (RoHC) compressors and decompressors face memory full issues due to the need for multiple contexts, leading to insufficient memory space and temporary cessation of packet stream compression, which hampers effective use of bandwidth resources in wired or wireless networks.
Innovation Solution
Implementing data processing methods in RoHC compressors and decompressors that involve freeing contexts other than the uncompressed profile when memory is insufficient, using static negative-acknowledgements to manage context storage, and switching to alternative contexts for compression and decompression, thereby maintaining continuous packet stream compression without stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple contexts are stored in memory to support multiple header flows, then compression capability is improved, but memory space is consumed and memory full occurs more likely
Solution Approach 1:
The patent implements context release mechanisms where contexts are discarded when no longer needed. The decompressor sends context release indications to the compressor, triggering the release of corresponding contexts. This allows memory space to be recovered and reused for new header flows, resolving the contradiction between maintaining multiple contexts for compression capability and limiting memory space consumption.
2Reliability
If memory space is increased to store more contexts, then memory full handling is improved, but device complexity and resource requirements increase
Solution Approach 1:
The patent implements dynamic context management where the number of stored contexts is not fixed but adjusts based on actual needs. Contexts are dynamically allocated when header flows are established and dynamically released when no longer needed. This dynamic approach improves reliability by preventing memory full conditions without requiring excessive static memory resources, thus reducing device complexity.
3Device complexity
If compression is stopped temporarily when memory is full, then memory management is simplified, but bandwidth resource utilization deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the decompressor monitors memory status and sends context release indications to the compressor when memory space becomes available. This feedback loop allows the compression process to continue without interruption, as contexts are released proactively based on decompressor memory status, thereby maintaining high bandwidth resource utilization while simplifying memory management.
4Quantity of substance
If contexts are released to free memory space, then memory availability is improved, but compression continuity may be affected
Solution Approach 1:
The patent implements preliminary context release action where the decompressor proactively sends context release indications before memory becomes full. This allows the compressor to release contexts in advance, ensuring memory availability is maintained without interrupting the compression process. The preliminary action ensures both memory availability and compression continuity are preserved.
Data Source
AI summary
Robust Header Compression (RoHC) compressors and decompressors are provided. A RoHC compressor includes a memory and a processor. The memory stores multiple contexts and multiple codes or program instructions. The processor executes the codes or the program instructions to perform the following steps: receiving a header flow; freeing at least one of the contexts when free space of the memory is insufficient; compressing the header flow; and transmitting the compressed header flow.