OFDMA Uplink Power Control Using RSSI Feedback

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Solution Overview

Problem

In WiFi6 applications, the transmission efficiency of OFDMA is diminished due to unoptimized transmission power of stations, particularly when there are significant differences in specifications and performance among stations.

Innovation Solution

An OFDMA power control method that adjusts transmission power by tracking the received signal strength indicator (RSSI) using a trigger-based packet protocol data unit (TB-PPDU) to optimize power settings for stations, employing a transceiver and processor circuit to manage power adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If OFDMA is used to improve transmission efficiency, then transmission efficiency is improved, but transmission power optimization is lost

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidtransmission power optimization

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic transmission power adjustment for stations in OFDMA systems. The access point continuously monitors RSSI values from uplink transmissions and dynamically adjusts target RSSI parameters in trigger frames, enabling adaptive power control that responds to changing channel conditions while maintaining OFDMA efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes a feedback loop where the access point measures RSSI of received TB-PPDU transmissions, compares measured values against target values, and uses this feedback to generate adjusted target RSSI parameters for subsequent trigger frames. This closed-loop feedback mechanism enables continuous power optimization without sacrificing OFDMA transmission efficiency.

Inventive Principle:

Principle #23Feedback

2Productivity

If transmission power is not optimized, then device complexity is reduced, but transmission efficiency deteriorates

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidpower control mechanism

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a self-service power control mechanism where stations autonomously adjust their transmission power based on target RSSI values received in trigger frames from the access point. This eliminates the need for complex centralized power management while achieving efficient power optimization across all stations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent optimizes transmission power by dynamically changing the target RSSI parameter in trigger frames. The access point adjusts this single parameter based on measured RSSI values, and stations automatically adapt their power levels in response, achieving efficient power control through simple parameter modification rather than complex mechanisms.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12550075B2Orthogonal frequency division multiple access power control method and related access point

Publication Date: 2026.02.10 REALTEK SEMICON CORP

AI summary

An OFDMA power control method includes: transmitting a first trigger frame to a station, wherein the first trigger frame includes a first target RSSI; receiving a first TB-PPDU from the station, wherein the first TB-PPDU is transmitted by the station using a first power according to the first target RSSI; measuring a first power of the first TB-PPDU to obtain a first measured RSSI; and generating a second the target RSSI according to the first measured RSSI.