In-Frame Retransmission for Wireless Error Recovery
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Solution Overview
Problem
Conventional wireless networks experience inefficiencies due to frame retransmissions, which result in media contention overhead, retransmission of packet headers and preamble, and delay, leading to performance degradation.
Innovation Solution
In-frame retransmissions of erroneous portions of the frame are used, where a receiver provides feedback through a feedback channel to retransmit negatively acknowledged portions within the same frame, eliminating the need for media re-contention and retransmission of full preambles and headers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional frame retransmission is used, then reliability is improved through retransmission of erroneous frames, but productivity deteriorates due to media contention overhead, header retransmission, and delay
Solution Approach 1:
The patent segments the retransmission process by dividing the frame into individual symbols. Instead of retransmitting the entire frame, only the specific erroneous symbols are identified and retransmitted separately. This segmentation allows the receiver to acknowledge correct symbols and request retransmission of only the failed portions, thereby improving productivity by reducing redundant retransmission overhead while maintaining reliability through targeted error correction.
2Reliability
If full frame retransmission is used, then reliability is improved through complete retransmission, but loss of time increases due to acknowledgment timeout and media contention
Solution Approach 1:
The patent implements preliminary action by having the receiver continuously monitor and acknowledge symbols as they are received and decoded, rather than waiting for the complete frame transmission to finish. This allows the sender to identify erroneous symbols early and retransmit them immediately within the same transmission opportunity, significantly reducing the acknowledgment timeout period and media contention delays while ensuring reliability through prompt error correction.
3Reliability
If conventional retransmission protocol is used, then reliability is improved through error recovery, but device complexity increases due to re-contention and full frame handling
Solution Approach 1:
The patent extracts and isolates only the erroneous symbols from the complete frame for retransmission. The receiver identifies specific failed symbols through continuous decoding monitoring and requests retransmission of only those particular symbols, rather than handling entire frames. This extraction approach reduces device complexity by eliminating the need for complete frame re-contention and full frame processing, while maintaining reliability through focused error recovery on the problematic symbols only.
Data Source
AI summary
Implementations for retransmitting erroneous portions within a transmission frame are described. A sender transmits a transmission frame and the receiver performs error detection on portions of the transmission frame in order to determine if any are received in error. The receiver sets up a feedback channel and transmits acknowledgements to the receiver to indicate that one or more portions have been received and to identify any portions that are received with errors. At least some of the acknowledgements are transmitted prior to receipt of the entire transmission frame. The sender retransmits any portions that are identified as being erroneous within the transmission frame.