Access Point FTM Session Burst Duration Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless access points (APs) face performance degradation when receiving multiple Fine Timing Measurement (FTM) requests simultaneously, especially when serving high-priority traffic, leading to potential packet drops and degraded data transmission quality.
Innovation Solution
The AP determines a maximum burst duration for handling FTM sessions and selectively initiates these sessions based on the service time required for high-priority traffic, prioritizing and managing FTM requests to ensure they do not exceed the available time slot, thereby avoiding performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the AP handles multiple FTM requests simultaneously, then the positioning accuracy and measurement capability are improved, but the performance degradation and packet drops occur due to resource contention with high-priority traffic
Solution Approach 1:
The patent implements dynamic resource allocation by making the AP's FTM session handling capability variable rather than fixed. The system dynamically adjusts whether to accept or reject FTM requests based on real-time traffic conditions, specifically comparing current traffic load against a threshold and prioritizing high-priority traffic when necessary. This dynamic approach allows the system to optimize positioning accuracy when resources are available while preventing performance degradation when high-priority traffic demands bandwidth.
Solution Approach 2:
The patent changes the operational parameters of the AP by introducing a threshold-based mechanism that modifies the AP's behavior based on traffic conditions. When the threshold is exceeded, the system changes parameters such as rejecting new FTM requests or delaying FTM session initiation, thereby controlling the number of simultaneous FTM sessions to maintain both positioning accuracy and transmission quality.
2Adaptability or versatility
If the AP accepts all FTM requests, then the measurement coverage and client service capability are improved, but the service time for high-priority traffic increases causing performance degradation
Solution Approach 1:
The patent segments the handling of FTM requests by categorizing them based on current network conditions and priority levels. Instead of treating all FTM requests uniformly, the system segments them into acceptable requests (when below threshold) and rejectable requests (when above threshold), allowing selective acceptance that maintains client service capability while protecting high-priority traffic service time.
Solution Approach 2:
The patent applies partial action by not accepting all FTM requests even when resources are available, but rather accepting only those that meet specific criteria. This selective acceptance prevents excessive resource consumption while maintaining adequate service capability, balancing between serving multiple clients and preserving service time for high-priority traffic.
3Measurement precision
If the AP increases burst duration for FTM sessions, then the measurement precision and completeness are improved, but the available time for high-priority traffic decreases causing performance degradation
Solution Approach 1:
The patent implements periodic evaluation of traffic conditions to determine whether to accept FTM requests. By periodically checking whether the current traffic load is below the threshold, the system can dynamically adjust its acceptance of FTM sessions, ensuring that burst durations for FTM measurements do not excessively encroach on high-priority traffic time while maintaining measurement precision when conditions permit.
Data Source
AI summary
Examples of techniques for handling multiple fine time measurement ranging requests are described. In an example, an access point (AP) may receive a ranging request for initiating an FTM session from each client device in a set of client devices. Based on the ranging request, a plurality of burst durations, each for performing the FTM session for each client device is determined. A maximum burst duration may be determined form the plurality. If a service time for serving high priority traffic is less than the maximum burst duration, a subset of the client devices is selected for performing the FTM session, where a sum of burst durations for performing the FTM session for each client device in the subset is less than the maximum burst duration. The FTM session for each client device in the subset is initiated.