WiFi Location Enhancement Through Multi-AP Signal Scanning
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Solution Overview
Problem
Existing systems for determining the location of wireless client devices within a network rely solely on signal samples from a single access point, which can lead to inaccurate positioning, especially when antennas are too proximate to each other.
Innovation Solution
A network management system (NMS) coordinates a plurality of access points to collect signal samples from both a primary and neighboring AP devices using targeted scanning, creating a scan channel list for neighboring APs to enhance location accuracy by triangulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal samples are collected from a single access point, then the system complexity is low, but the location determination accuracy deteriorates
Solution Approach 1:
The patent combines signal samples from multiple access points (primary AP and neighboring APs) into a unified location determination process. The network management system collects RSSI values from both the primary AP providing wireless connectivity and neighboring APs, then integrates these multiple signal sources to calculate client device location, thereby improving accuracy through combined measurements
2Volume of moving object
If antennas are placed close together to reduce device size, then the device compactness is improved, but the location triangulation accuracy deteriorates
Solution Approach 1:
The patent transitions from two-dimensional spatial separation requirements (needing physically distant antennas) to a multi-access-point dimensional approach. Instead of relying on vertical separation of antennas within a single AP, the system uses horizontal separation across multiple APs, creating a network-level triangulation system that achieves accurate location determination without requiring large physical device footprints
3Measurement precision
If neighboring access points scan additional channels to collect signal samples, then the location accuracy is improved, but the network scanning complexity increases
Solution Approach 1:
The network management system performs preliminary configuration by generating packetized scan commands with tailored scan channel lists for each neighboring AP before the actual location determination process. This pre-planning of scan parameters optimizes the subsequent data collection phase, ensuring that each AP scans only the necessary channels to capture client device signals efficiently
4Measurement precision
If multiple access points are coordinated to collect signal samples, then the location accuracy is improved, but the coordination overhead increases
Solution Approach 1:
The system implements self-service mechanisms where the network management system automatically generates optimized scan commands for neighboring APs based on client device connections to primary APs. The neighboring APs autonomously execute these pre-configured scan operations and return results, eliminating the need for continuous manual coordination or complex real-time control signaling during the actual measurement process
Data Source
AI summary
Techniques are described by which a network management system (NMS) is configured determine a specific wireless channel assigned to a first AP device. The NMS is further configured to determine one or more neighboring AP devices that are within a certain proximity of the first AP device and generate a packetized scan command for each of the one or more neighboring AP devices. The NMS is further configured to send the packetized scan command to each of the one or more neighboring AP devices and receive, from the first AP device and each of the one or more neighboring AP devices, signal samples of a client device connected to the first AP device on the specific wireless channel assigned to the first AP device. The NMS is further configured to, based on the received signal samples, determine a location within the site of the client device.