Wi-Fi CSI False Alarm Avoidance via CLPC Tagging

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Solution Overview

Problem

The activation of Closed Loop Power Control (CLPC) function in Wi-Fi systems causes false alarms in motion detection by disturbing Channel State Information (CSI) amplitude, even when there is no object movement, leading to incorrect motion statistics.

Innovation Solution

A method and device that involve adding a CLPC tag to the Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) by the transmitting device and discarding PPDU with the CLPC tag by the receiving device to prevent false alarms, ensuring accurate CSI analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If CLPC function is activated to improve power control, then power efficiency is improved, but false alarms in motion detection increase due to CSI disturbance

Engineering Contradiction:

Improvepower efficiencyVSAvoidmotion detection accuracy

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent segments the PPDU structure by adding a specific CLPC tag field that separately identifies packets affected by CLPC function. This allows the receiving device to distinguish between normal channel variations and CLPC-induced disturbances, enabling accurate motion detection while maintaining CLPC power control benefits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The CLPC tag acts as an intermediary indicator that mediates between the transmitting device's power control actions and the receiving device's motion detection analysis. By tagging affected packets, the system allows the receiver to exclude or separately process these packets, preventing false alarms while preserving energy efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If CLPC function is activated to control transmit power, then energy consumption is reduced, but CSI amplitude stability deteriorates causing false motion detection

Engineering Contradiction:

Improveenergy consumptionVSAvoidCSI amplitude stability

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

The transmitting device performs preliminary action by adding the CLPC tag to the PPDU before transmission. This advance tagging allows the receiving device to proactively identify and handle CLPC-affected packets, maintaining CSI amplitude stability for motion detection purposes while preserving the energy-saving benefits of CLPC.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If CLPC function is enabled to optimize power control, then power management is improved, but motion statistics accuracy deteriorates due to false alarms

Engineering Contradiction:

Improvepower managementVSAvoidmotion statistics accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The CLPC tag provides feedback information to the receiving device about which packets are affected by power control adjustments. This feedback mechanism enables the receiver to accurately interpret motion statistics by distinguishing between genuine motion-induced channel changes and those caused by CLPC power management, maintaining both ease of operation and measurement precision.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11929809B2Method and device for avoiding false alarms of channel state information due to activation of closed loop power control function

Publication Date: 2024.03.12 WISTRON NEWEB CORP

AI summary

A method for avoiding false alarms of Channel State Information (CSI) due to the activation of a Closed Loop Power Control (CLPC) function is provided. The method is executed by a transmitting device and includes: determining whether the CLPC function of the transmitting device is enabled; adding at least one CLPC tag to a physical layer convergence procedure (PLCP) protocol data unit (PPDU) when the CLPC function is enabled; and transmitting the PPDU.