Presence-Based Wi-Fi AP Power Control for Low-Interference Coverage
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Solution Overview
Problem
Existing radio resource management (RRM) methods for Wi-Fi access points in large public venues do not account for varying user densities, leading to interference when the venue is not full, as they focus on AP transmit signals without considering client distribution.
Innovation Solution
An adaptive presence-based radio configuration system that dynamically adjusts the operating mode, channel structure, and transmit power of access points based on user density, using iterative descent processes to minimize cross-AP interference by defining regions with center points and optimizing energy levels and overlap constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high AP density is deployed in large public venues with APs positioned below seats, then coverage is improved and channel reuse is promoted when venue is full, but signal interference among nearby APs increases when venue is not full
Solution Approach 1:
The patent implements dynamic adjustment of AP transmit power levels based on real-time detection of user presence and density. When the venue is not full, APs automatically reduce their transmit power to prevent signal bleed and interference. When the venue is full, APs increase power to maintain coverage. This dynamic adaptation resolves the contradiction between maintaining coverage area and preventing interference under varying occupancy conditions.
Solution Approach 2:
The system changes the transmit power parameter of APs based on detected user density. By monitoring the number of clients or users in the venue and adjusting the power parameter accordingly, the system optimizes signal propagation to match actual occupancy levels, thereby preventing interference when sparse while maintaining coverage when full.
2Object-affected harmful factors
If RRM methods are used to reduce AP output power to limit channel overlap, then interference is reduced, but the methods do not account for varying user densities and are not designed for under the seat scenarios
Solution Approach 1:
The patent incorporates feedback mechanisms where APs continuously monitor user presence, client density, and signal conditions in real-time. This feedback information is used to dynamically adjust transmit power levels and channel assignments. The system adapts to varying user densities by receiving feedback about actual occupancy and modifying RRM parameters accordingly, making it versatile for both full and partial venue scenarios as well as under-seat deployments.
Solution Approach 2:
The system performs preliminary detection of user presence and density before optimizing RRM parameters. By proactively identifying occupancy levels and predicting potential interference scenarios, the system can pre-adjust power levels and channel assignments to prevent interference before it occurs, rather than reacting after the problem arises.
Data Source
AI summary
A method for adaptive presence-based radio configuration of access points in a venue includes defining a number of regions in the venue in which access points are deployed, each region having a center point, and assigning a first access point to a first region, positioned at the center of the first region. The method also includes affecting a first energy level in the first region, which corresponds to a power of a transmit signal emitted by the first access point, and assigning to the first region a configurable capacity value that determines an acceptable overlap constraint between the first energy level of the first region and an energy level of a neighboring region. The method further includes generating data describing a tessellation graph in which a possible map of the access points is formed using an iterative descent process based on the first energy level and the overlap constraint.