R-TWT Synchronization for Low-Latency Wi-Fi AP Coordination

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Solution Overview

Problem

Existing Wi-Fi technologies face challenges in optimizing low-latency service data transmission, leading to interference and reduced efficiency due to mismatched Restricted Target Wake Times (R-TWT) between access points and stations, which affect data transmission and spectrum utilization.

Innovation Solution

A method and electronic device that synchronize R-TWTs by broadcasting frames with timing synchronization parameters (TSF) to align the R-TWTs across access points and stations, ensuring stations refrain from communicating during designated R-TWTs to avoid interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If R-TWT scheduling is implemented to reduce latency, then low-latency service transmission is improved, but interference occurs between multiple APs and STAs due to unsynchronized R-TWT timing

Engineering Contradiction:

ImprovelatencyVSAvoidinterference

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the first AP receives R-TWT scheduling information from the second AP, compares it with its own scheduling, and adjusts its R-TWT timing accordingly. This feedback loop ensures synchronized R-TWT execution across multiple APs, eliminating interference while maintaining low-latency transmission.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent creates equipotentiality by synchronizing R-TWT timing across different APs to a common reference time. All APs and STAs operate on the same time schedule, ensuring that R-TWT transmission windows are aligned and no interference occurs between simultaneously transmitting devices.

Inventive Principle:

Principle #12Equipotentiality

2Ease of operation

If multiple APs operate independently with their own R-TWT schedules, then each AP can manage its STAs autonomously, but spectrum utilization decreases due to timing mismatches and communication conflicts

Engineering Contradiction:

Improveautonomous managementVSAvoidspectrum utilization

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent merges the R-TWT scheduling of multiple independent APs into a unified synchronized schedule. By combining the timing information from different APs and establishing a common R-TWT timeline, the system achieves coordinated operation that improves spectrum utilization while maintaining the autonomous management capability of each AP through the standardized synchronization protocol.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4723749A1Low-latency service transmission method, electronic device and storage medium

Publication Date: 2026.04.08 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

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AI summary

Embodiments of the present disclosure relate to the technical field of mobile communications, and provide a low-latency service transmission method, an electronic device and a storage medium. The low-latency service transmission method is applied to a first access point (AP). The method comprises: determining a first radio frame, wherein the first radio frame comprises a second R-TWT SP of a second AP and time synchronization parameter (TSF) information of the second AP; sending the first radio frame to instruct a station (STA) to determine the time of the second R-TWT SP according to the TSF information and the second R-TWT SP, and not communicate with the first AP within the time of the second R-TWT SP. The embodiments of the present disclosure provide a transmission mode of low-latency service data.