Wi-Fi Transmit Power Reporting for Multi-STA Link Adaptation

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Solution Overview

Problem

Current transmit power control (TPC) schemes in WiFi 5G band fail to timely report TPC information when the link between an AP and an STA changes, and can only request TPC information from one STA at a time, making it inefficient for multiple STA scenarios.

Innovation Solution

Implementing a method where APs and STAs actively report TPC information through TPC report control fields in various frames, such as QoS Data, QoS Null, and management frames, and HE TB PPDU, to adjust transmit power based on received TPC information, enabling unsolicited reporting and adaptive power adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the current TPC scheme is used, then the AP can request TPC information from STAs, but the STA fails to report TPC information timely when link changes occur

Engineering Contradiction:

ImproveTPC information reporting timelinessVSAvoidTPC information acquisition efficiency

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The STA autonomously determines when to report TPC information based on local link conditions without waiting for AP requests. When link changes occur or preset time elapses, the STA actively sends TPC reports through trigger frames, making the system self-driven rather than request-driven.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system pre-configures trigger conditions (link changes, preset time) that automatically initiate TPC information reporting before the AP needs it. This ensures TPC information is available timely without requiring continuous AP initiation.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the AP requests TPC information from one STA at a time, then the protocol remains simple, but the acquisition efficiency for multiple STAs becomes very low

Engineering Contradiction:

ImproveTPC information acquisition efficiencyVSAvoidTPC reporting mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Multiple TPC reporting operations are merged into a single trigger frame transmission. The AP sends one trigger frame that simultaneously initiates TPC information reporting from multiple STAs, consolidating what would otherwise be multiple sequential operations into one efficient action.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The trigger frame serves multiple functions: it notifies STAs of link changes, sets preset timers, and initiates TPC information reporting all in one message. This multi-functional approach increases productivity without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260046785A1Transmit power adjusting method

Publication Date: 2026.02.12 HORIZON SEMICON CO LTD

AI summary

The present disclosure provides a transmit power adjusting method, including: sending, in response to a successful contention for a channel, a target frame including a transmit power control (TPC) report control field, wherein the target frame is any one of QoS Data frame, QoS Null frame and management frame, and the TPC report control field indicates a first transmit power for transmitting the target frame; and receiving a MAC layer protocol data unit (MPDU), wherein a second transmit power for transmitting the MPDU is at least partially based on the first transmit power.