Station OBO Counter Value Selection for Wi-Fi Contention
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Solution Overview
Problem
The 802.11 ax protocol lacks a specific value selection mode for the OFDMA back-off (OBO) counter, leading to random number generation in different environments, which causes access collisions and lowers the station's contention success rate due to unspecified value selection.
Innovation Solution
A method for selecting the OBO counter value based on the frequency underutilization rate, count of unallocated stations, and contention-failed RUs, involving Beacon message analysis to determine a real-time contention window value and adjust the OBO counter accordingly, thereby optimizing contention success probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the STA uses random number generation mode for OBO counter value selection as specified in 802.11 ax protocol, then the value selection process is simple, but access collision occurs frequently and contention success rate decreases
Solution Approach 1:
The patent transforms the static random number generation method into a dynamic adaptive selection method. The OBO counter value is no longer selected purely randomly but adapts based on real-time channel conditions including frequency underutilization rate, number of associated stations, and number of contention-failed RUs. This dynamic adjustment optimizes contention success rate while maintaining operational simplicity through automated environmental assessment.
Solution Approach 2:
The patent implements feedback mechanisms by having the STA continuously monitor channel conditions and adjust OBO counter values accordingly. The system uses feedback from frequency underutilization measurements, association station counts, and contention failure statistics to iteratively optimize the back-off behavior, creating a closed-loop control system that improves reliability while maintaining ease of operation through automated decision-making.
2Loss of time
If the OBO counter value is selected without considering environmental factors, then the selection process is fast and simple, but access collision increases and RU allocation efficiency decreases
Solution Approach 1:
The patent applies preliminary action by having the STA pre-assess channel conditions including frequency underutilization rate, number of associated stations, and contention failure patterns before selecting the OBO counter value. This preliminary environmental assessment enables the system to make informed decisions quickly, avoiding both excessive delays and random selections that lead to collisions, thereby improving RU allocation efficiency without significant time loss.
3Adaptability or versatility
If the same random number generation mode is used in different environments, then the implementation is consistent and simple, but contention success rate decreases due to access collision
Solution Approach 1:
The patent applies local quality by tailoring the OBO counter value selection to specific local environmental conditions. Instead of using a uniform random generation approach across all environments, the system adjusts the selection strategy based on local factors such as frequency underutilization rate in specific bands, number of associated stations in particular networks, and contention failure patterns in specific scenarios. This localized adaptation significantly improves contention success rate while maintaining implementation feasibility through structured environmental assessment.
Data Source
AI summary
Disclosed in the present disclosure is a station, method for selecting value of OBO counter of station and electronic device. The method includes: acquiring a Beacon message sent by an access point (AP); computing the count of unallocated stations allocated no RU among the associated stations according to the count of the associated stations; acquiring a count of contentious RUs allocated to the associated stations by the AP in the previous trigger frame; computing a count of contention-failed RUs in the contentious RUs allocated to the associated stations by the AP in the previous trigger frame according to the frequency underutilization rate; and determining a value of the OBO counter according to the count of the unallocated stations, the count of the contentious RUs and the count of the contention-failed RUs.