Multi-AP Uplink Power Control Using Per-AP Signal Parameters

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Solution Overview

Problem

Existing methods for controlling uplink transmission power in wireless local area networks (WLAN) lack accuracy due to irregular AP arrangements and varying performance, leading to reduced estimation accuracy in multi-AP coordination.

Innovation Solution

A method for improving transmission power control accuracy by using a radio communication system with multiple APs and STAs, where each AP generates and transmits control signals with specific transmission power parameters based on capabilities and coverage, allowing flexible control of uplink power per terminal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a single access point is used for transmission power control, then the control method is simple, but the transmission power control accuracy is insufficient in multi-AP coordination scenarios

Engineering Contradiction:

Improvetransmission power control accuracyVSAvoidcontrol system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the transmission power control into multiple segments: each access point independently determines its own downlink transmission power, and each terminal independently determines its uplink transmission power based on received signals from multiple APs. This segmentation allows accurate per-AP power control without requiring a centralized complex control system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements local quality by allowing each access point to have its own transmission power characteristics and each terminal to independently control its uplink power based on local measurements of downlink signals from different APs. This enables optimized power control tailored to each AP- terminal link while maintaining overall system coordination.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If access points are arranged irregularly with varying performance, then the system is more adaptable to different deployments, but the estimation accuracy of transmission power is reduced

Engineering Contradiction:

ImproveAP arrangement flexibilityVSAvoidtransmission power estimation accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent changes the parameter used for power control from fixed or centrally-determined values to dynamically measured downlink received power levels. Each terminal measures the actual downlink signal strength from each AP and uses these measurements to calculate appropriate uplink transmission power, adapting to irregular AP arrangements and varying AP performances.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback by having terminals measure downlink transmission power from multiple APs and use this feedback information to determine their own uplink transmission power. This closed-loop feedback mechanism ensures accurate power control even when APs are irregularly arranged or have varying performance characteristics.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4727224A2Access point, terminal, and communication method

Publication Date: 2026.04.15 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

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AI summary

This access point is provided with a control circuit which, on the basis of transmission power control-related information received from another access point, generates a parameter relating to uplink transmission power control, and a transmission circuit which transmits a control signal that includes said parameter.