Wireless Access Point Resource Unit Selection for Interference Mitigation
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Solution Overview
Problem
Wireless interference in OFDMA systems, particularly in unlicensed spectra, leads to frequent transmission failures and increased resource usage due to frequency selective fading and persistent interference, necessitating an efficient resource unit selection method for retransmissions.
Innovation Solution
A method in a wireless access point that selects a candidate resource unit for retransmissions based on the average previous success rate and correlation with the failed resource unit, ensuring a high likelihood of success by choosing a resource unit with a high success rate and minimal correlation to the failed unit, potentially adjusting the resource unit width to meet success rate thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource units are assigned for transmission in OFDMA systems, then data communication is enabled, but wireless interference and transmission failures occur due to frequency selective fading and persistent interference
Solution Approach 1:
The system performs preliminary actions by tracking and recording the success rates of resource units before retransmission. The access point maintains historical data on which resource units have succeeded or failed, and uses this information proactively to select resource units for retransmission that are statistically more likely to succeed, rather than reacting to failures after they occur.
Solution Approach 2:
The system implements feedback by monitoring transmission outcomes and using this information to guide future resource unit selections. The access point tracks success rates of different resource units and adjusts its selection strategy based on this feedback, creating a closed-loop system that continuously improves transmission reliability by avoiding resource units with poor historical performance.
2Productivity
If retransmissions are performed using the same resource units, then transmission attempts are made, but resource consumption increases and congestion worsens due to repeated failures
Solution Approach 1:
The system changes the parameter of resource unit selection by incorporating success rate metrics into the selection process. Instead of using static or random resource unit assignment, the access point dynamically selects resource units based on their historical success rates, transforming the selection criterion from arbitrary to performance-based, thereby improving transmission efficiency while reducing resource consumption.
Solution Approach 2:
The system enables self-service by allowing the resource unit selection process to automatically adapt based on observed performance patterns. The access point autonomously tracks success rates and makes intelligent selection decisions without requiring external intervention or complex centralized control, improving efficiency while conserving resources through automated, data-driven decisions.
Data Source
AI summary
A method is provided in wireless access point in a wireless communications network. The method includes assigning a first resource unit for a first transmission between the wireless access point and a wireless terminal. The method further includes determining that the first transmission using the first resource unit failed. The method further includes selecting a candidate resource unit for a retry transmission. The candidate resource unit is selected based on at least an average previous success rate of available resource units at a width of the first resource unit and a correlation between the candidate resource unit and the first resource unit. The method further includes assigning the candidate resource unit for the retry transmission if a success rate of the candidate resource unit is above a predetermined threshold.