Restricted TWT Query Signaling After TBTT in Wireless LAN

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Solution Overview

Problem

Wi-Fi networks face challenges in supporting time-delay sensitive traffic due to lower transmission rates and interference, making it difficult to manage channel monopolization and ensure efficient transmission of latency-sensitive data.

Innovation Solution

A method for requesting information about restricted Target Wake Time (TWT) is proposed when the STA has not received it, allowing the STA to transmit a signal to the AP after a certain period, ensuring efficient transmission and reception of latency-sensitive data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the STA waits for the AP to transmit TWT information in beacon frames, then the STA can receive TWT scheduling information, but the STA may miss the TWT information transmission and cannot obtain restricted TWT details in time

Engineering Contradiction:

ImproveTWT information reception reliabilityVSAvoidTime delay in obtaining TWT information

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The STA transmits a query frame to the AP after the TBTT to request restricted TWT information that was not received in beacon frames. This feedback mechanism ensures the STA obtains necessary TWT scheduling information within the restricted TWT service period, resolving the contradiction between reliable information reception and time delay.

Inventive Principle:

Principle #23Feedback

2Reliability

If the STA transmits query frames frequently to ensure TWT information reception, then the STA can obtain TWT details reliably, but the channel contention increases and transmission efficiency decreases

Engineering Contradiction:

ImproveTWT information acquisition reliabilityVSAvoidChannel transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The STA performs preliminary actions by setting a timer at the TBTT and preparing to transmit query frames only if TWT information is not received in beacon frames. This conditional approach ensures reliable TWT information acquisition while minimizing unnecessary channel contention and maintaining transmission efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The STA applies partial action by transmitting query frames only when necessary (when TWT information is missed), rather than continuously. This selective querying mechanism balances information reliability with channel transmission efficiency, avoiding excessive channel usage while ensuring TWT details are obtained when needed.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12483986B2Method for requesting information on restricted TWT in wireless LAN system and device using same method

Publication Date: 2025.11.25 LG ELECTRONICS INC

AI summary

The specification proposes a method for requesting information on a restricted TWT when an STA has failed to receive the information. According to an embodiment of the present specification, when an STA fails to acquire information on a restricted TWT, the STA may transmit, to an AP, a signal for requesting the information on the restricted TWT after a certain time elapses from a TBTT. The signal may be transmitted independently or may be transmitted together with another signal transmitted by the STA.