Wi-Fi TPC Reporting for Adaptive AP-STA Transmit Power

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Solution Overview

Problem

Current transmit power control (TPC) schemes in Wi-Fi 5G band fail to timely report TPC information when the link between an AP and an STA changes, and are inefficient in acquiring TPC information from multiple STAs simultaneously.

Innovation Solution

Implementing a method where APs and STAs actively report TPC information through a TPC report control field in frames like QoS Data, QoS Null, and management frames, or via TPC report poll trigger frames, allowing adaptive power adjustments based on received transmit power and link margin information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the current TPC scheme is used, then the transmit power control can be implemented, but the TPC information cannot be reported timely when the link changes

Engineering Contradiction:

Improvetimely reporting of TPC informationVSAvoiddelay in TPC information reporting

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements dynamic TPC information reporting by allowing STAs to actively report TPC information in response to trigger frames or at predetermined times, rather than relying on periodic polling. This dynamic mechanism ensures timely updates when link conditions change, resolving the contradiction between reliable TPC information reporting and time delay.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes a feedback mechanism where STAs report TPC information back to the AP through response frames containing TPC report control fields. This feedback loop enables the AP to receive timely TPC information and adjust transmit power accordingly, improving both reliability and reducing reporting delays.

Inventive Principle:

Principle #23Feedback

2Productivity

If the current TPC scheme is used, then TPC information can be acquired from one STA at a time, but the acquisition efficiency is very low

Engineering Contradiction:

Improveefficiency of TPC information acquisitionVSAvoidtime required to acquire TPC information from multiple STAs

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent merges multiple TPC information acquisition operations into a single trigger frame transmission. The AP can send one trigger frame to multiple STAs, and each STA responds with its TPC information in a coordinated manner, significantly improving acquisition efficiency and reducing the time required to collect TPC information from multiple STAs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The trigger frame mechanism serves multiple functions: it can poll for TPC information from multiple STAs simultaneously, request buffer status reports, and initiate other uplink transmissions. This multi-functional approach improves overall system productivity by consolidating multiple control operations into a single frame exchange.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12490200B2Transmit power adjusting method

Publication Date: 2025.12.02 TP LINK CORP 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.