R-TWT Scheduling Across OBSS for Low-Latency Wireless Traffic

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Solution Overview

Problem

In wireless communication systems, interference during restricted target wake time (R-TWT) service periods can disrupt the timely delivery of latency-sensitive traffic, particularly in scenarios like low-latency and high-definition video streaming.

Innovation Solution

A method for establishing R-TWT between an access point device and a station device by exchanging information about overlapping basic service sets (OBSS) to identify potential interference and coordinate R-TWT schedules, using TWT elements to manage and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If R-TWT is established to deliver latency-sensitive traffic, then data transmission reliability is improved, but interference from overlapping BSSs worsens the delivery timing

Engineering Contradiction:

Improvelatency-sensitive traffic deliveryVSAvoidinterference from OBSS

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having the station device report OBSS information to the access point device before the R-TWT service period begins. The access point device then determines an R-TWT schedule that avoids time overlap with OBSS transmission periods, preventing interference before it occurs rather than reacting after interference happens.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses OBSS information reporting as an intermediary mechanism. The station device acts as an intermediary by collecting and reporting OBSS information to the access point device, which then uses this information to coordinate the R-TWT schedule, avoiding direct conflict with overlapping BSSs.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of time

If TWT is used to reduce contention and wake-up time, then power saving is improved, but interference during R-TWT SP worsens latency performance

Engineering Contradiction:

Improvewake-up timeVSAvoidlatency-sensitive traffic delivery

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by making the R-TWT schedule adaptable based on reported OBSS information. The access point device dynamically adjusts the R-TWT timing parameters (start time, duration, frequency) based on the actual OBSS transmission patterns reported by the station device, allowing the system to respond to changing interference conditions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250310876A1Wireless communication method, access point device, and station device

Publication Date: 2025.10.02 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Disclosed is a wireless communication method, and the method includes: receiving, by a first access point device, first information transmitted by a first station device, where the first information is used for indicating information of at least one first basic service set (BSS), transmission within the at least one first BSS is capable of interfering with transmission during a restricted target wake time (R-TWT) service period (SP) established between the first station device and the first access point device, and the at least one first BSS is an overlapping basic service set (OBSS) of a BSS to which the first access point device and the first station device belong; and establishing, by the first access point device, an R-TWT between the first access point device and the first station device according to the first information.