Wireless Retransmission via Dynamic Channel Allocation
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Solution Overview
Problem
Conventional wireless packet communication methods face inefficiencies in throughput during retransmissions due to changes in the number of idle wireless channels, leading to increased average delay and jitter, especially when using Multiple Input Multiple Output (MIMO) systems, as leakage power from adjacent channels can interfere with acknowledgment packet reception.
Innovation Solution
The method involves comparing the number of idle wireless channels or MIMO configurations with the number of retransmission packets and reconstructing or copying packets to ensure simultaneous transmission using available channels, allowing for continuous transmission without physical carrier sense, thereby improving throughput and reducing packet errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless channels are used for simultaneous transmission of data packets, then throughput is improved, but leakage power from adjacent channels interferes with acknowledgment packet reception
Solution Approach 1:
The patent extracts the harmful leakage power from the system by introducing guard intervals between transmissions on different channels. This temporal separation removes the interference problem while preserving the benefits of multi-channel simultaneous transmission for improving throughput.
Solution Approach 2:
The patent introduces guard intervals as an intermediary temporal buffer between transmissions on different wireless channels. This mediator prevents direct interference between adjacent channels by ensuring that one transmission completes before another begins, thus protecting acknowledgment packet reception while maintaining multi-channel throughput benefits.
2Adaptability or versatility
If the number of idle channels changes during retransmission, then channel utilization efficiency decreases, but maintaining fixed channel allocation reduces adaptability
Solution Approach 1:
The patent implements dynamic channel allocation where the system continuously monitors the number of idle channels and adjusts the number of simultaneous transmissions accordingly. This dynamic adaptation allows the system to optimize retransmission efficiency by matching the transmission count to available channel resources, resolving the contradiction between adaptability and productivity.
3Reliability
If physical carrier sense is performed before each transmission, then channel access reliability is improved, but transmission delay increases
Solution Approach 1:
The patent performs carrier sense in advance before allocating channels for simultaneous transmission, and maintains this channel allocation for subsequent retransmissions. This preliminary action ensures reliable channel access while reducing delays by avoiding repeated carrier sense operations for each retransmission, thus resolving the contradiction between reliability and time loss.
Data Source
AI summary
In retransmission processing due to a failure of transmission of data packets, a plurality of data packets are simultaneously transmitted between two STAs by utilizing multiple wireless channels and MIMO, and the number of idle channels and the number of retransmission packets are compared. Then, when both of the numbers are different or only when the number of idle channels is larger than the number of retransmission packets, the retransmission packets are reconstructed according to the number of idle channels, and the reconstructed retransmission packets are simultaneously transmitted by using the idle channels.