Access Point Collaborative Signal Detection for WLAN Load Balancing
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Solution Overview
Problem
Existing wireless local area networks (WLANs) face challenges in maintaining high-performance links and service quality due to overloading, especially in high-density deployments, and existing load balancing techniques often result in sub-optimal communication performance and cannot adapt to changing wireless conditions.
Innovation Solution
An access point that performs dynamic load balancing by determining available capacity metrics, comparing them with neighboring access points, and recommending electronic devices to transition to different communication channels using protocols like BTM, and also collaboratively detects electronic devices' signal strength through fake traffic to facilitate load balancing even when devices do not support IEEE 802.11k.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing load balancing techniques are implemented, then access point overload is reduced, but communication performance becomes sub-optimal and random
Solution Approach 1:
The patent implements a feedback mechanism where access points continuously exchange capacity metrics with neighboring access points. The access point determines its available capacity metric based on current load conditions, shares this information with neighbors, and receives their capacity metrics in return. This feedback loop enables informed load balancing decisions that optimize communication performance while maintaining service quality.
Solution Approach 2:
The load balancing system dynamically adjusts based on changing wireless conditions. The access point continuously monitors its available capacity metric and compares it with neighboring access points' metrics. When conditions change (e.g., capacity decreases due to increased load), the system automatically triggers load balancing actions by providing recommendations to electronic devices to transition to different channels or access points.
2Reliability
If access points reject electronic devices for load balancing, then overload is reduced, but devices may associate with inferior access points
Solution Approach 1:
The system performs preliminary assessment of neighboring access points' capacity metrics before directing electronic devices to transition. By determining and sharing available capacity metrics in advance, the access point can identify suitable target access points that have adequate capacity, ensuring that devices associate with high-quality access points rather than randomly selecting inferior ones.
3Measurement precision
If collaborative detection with fake traffic is used, then signal strength measurement is achieved for incompatible devices, but additional communication overhead is introduced
Solution Approach 1:
The patent uses fake traffic as an intermediary mechanism to enable signal strength measurement for devices that do not support IEEE 802.11k. The access point sends fake traffic to the electronic device and measures the signal strength based on the device's response. This intermediary approach allows compatible and incompatible devices to coexist in the same network while maintaining accurate signal strength detection capabilities.
Data Source
AI summary
An access point that performs collaborative detection of an electronic device is described. During operation, the access point may receive a request from a second access point using wired or wireless communication, where the request specifies a communication channel. In response to this request, the access point may perform a wireless scan of the specified communication channel. Moreover, the access point may provide, using wired or wireless communication, a trigger message to the second access point with an instruction for the second access point to provide fake traffic to the electronic device. Then, the access point may receive, using wireless communication, a response from the electronic device to the fake traffic. Next, the access point may provide, using wired or wireless communication, a report to the second access point with information specifying at least a communication performance metric of the electronic device.