Header Compression Apparatus Using ARQ Negotiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The combination of ROHC and ARQ technologies in wireless communication systems faces issues such as data packet disorder, loss of synchronization of context information, and inefficient header compression due to errors and packet losses, leading to reduced compression efficiency and resource wastage.
Innovation Solution
A communication method and apparatus that negotiates parameters for header compression and ARQ, constructs lower-layer PDUs with header compression information, performs cyclic redundancy checks, and updates context information to ensure accurate decompression and retransmission of error packets, thereby improving header compression efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ROHC and ARQ technologies are combined to improve transmission reliability in wireless links, then packet loss recovery is improved, but data packet disorder and loss of synchronization of context information occur
Solution Approach 1:
The patent applies preliminary action by inserting indication information into the packet header before transmission to mark whether context information should be saved. This allows the receive end to proactively prepare for context information updates or preservation, preventing synchronization loss before it occurs. The compressor also proactively manages the context information save list to ensure proper synchronization state maintenance.
Solution Approach 2:
The patent implements feedback mechanisms where the receive end sends acknowledgments to the compressor about received packets and their decompression status. This feedback loop allows the compressor to adjust its compression strategy and context information management based on actual reception conditions, maintaining synchronization despite packet retransmissions or losses.
2Quantity of substance
If header compression is performed to reduce data transmission volume, then bandwidth usage rate is improved, but compression efficiency decreases due to errors and packet losses
Solution Approach 1:
The patent applies dynamics by making the header compression adaptive to channel conditions. The compressor dynamically adjusts compression parameters based on packet error rates and loss patterns, while the receive end dynamically manages context information saving based on actual decompression success. This dynamic adaptation maintains high compression efficiency even in error-prone wireless environments.
Solution Approach 2:
The patent changes parameters by introducing indication information in packet headers that signals whether context information should be preserved or updated. This parameter change allows the system to flexibly adjust compression behavior based on current transmission conditions, maintaining efficiency by avoiding unnecessary context information retransmission while ensuring accurate decompression.
3Measurement precision
If context information is updated to maintain synchronization, then decompression accuracy is improved, but air interface resources are wasted due to retransmission of error packets
Solution Approach 1:
The patent extracts only the necessary context information saving indications from full packet retransmission. By inserting compact indication information in packet headers that specifies whether context information should be saved, the system avoids retransmitting entire context information sets, significantly reducing air interface resource consumption while maintaining decompression accuracy.
Solution Approach 2:
The patent uses copying by maintaining a context information save list that tracks which context information should be preserved. Instead of retransmitting actual context data, the system copies management information (indication flags) that guide the receive end to preserve or update appropriate context information, reducing resource usage while ensuring accuracy.
Data Source
AI summary
A communication method and a related apparatus for header compression by using an automatic retransmission mechanism are disclosed. The method comprises determining with a receive end parameters required for performing header compression and an ARQ through negotiation, constructing a lower-layer PDU that comprises header compression information, and sending the PDU to a receive end. By using methods provided in the embodiments of the present invention, combination of a header compression mechanism and an ARQ mechanism may be implemented, thereby improving header compression efficiency and accuracy, and saving air interface resources.