Selective rTWT Scheduling for Interference-Aware OBSS Communication

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless networks face interference issues due to overlapping Basic Service Sets (OBSS) where devices unnecessarily restrict communication during coordinated Restricted Target Wait Time (rTWT) periods, leading to network performance degradation and reduced capacity.

Innovation Solution

Implement coordinated rTWT scheduling across OBSSs, where devices determine when to respect service periods based on actual interference, using rTWT service period frames that indicate whether periods must be respected always or only if activity is heard, thereby optimizing communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If devices restrict communication during coordinated rTWT periods in OBSS, then interference is reduced, but network capacity and performance deteriorate

Engineering Contradiction:

ImproveinterferenceVSAvoidnetwork capacity

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies local quality by differentiating between different spatial regions and interference scenarios. Devices selectively restrict communication only in specific OBSS contexts where actual interference is detected, rather than applying uniform restrictions across all BSS boundaries. This allows communication to proceed in regions where no interference occurs, maintaining network capacity while protecting against harmful interference where it exists.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the communication restriction policy adaptive rather than static. Devices dynamically adjust their behavior based on real-time detection of actual interference conditions during rTWT periods. The restriction mechanism transitions from a fixed predetermined approach to a flexible dynamic approach where devices can communicate during non-interfering periods and restrict only when interference is detected, optimizing both interference reduction and network capacity utilization.

Inventive Principle:

Principle #15Dynamics

2Reliability

If devices always respect rTWT service periods, then interference protection is improved, but unnecessary signaling overhead increases

Engineering Contradiction:

Improveinterference protectionVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent applies partial action by implementing selective respect for rTWT service periods rather than universal respect. Devices perform partial interference detection and selectively apply communication restrictions only when interference is actually present, rather than always restricting communication during rTWT periods. This reduces unnecessary signaling overhead while maintaining adequate interference protection for periods where it is truly needed.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements self-service by enabling devices to autonomously detect interference conditions and make independent decisions about communication restrictions. Each device monitors its own interference environment and determines whether to respect rTWT service periods based on actual conditions, eliminating the need for centralized coordination and excessive signaling overhead while maintaining reliable interference protection.

Inventive Principle:

Principle #25Self-service

3Productivity

If coordinated rTWT scheduling is implemented across OBSS, then network performance is improved, but device complexity increases

Engineering Contradiction:

Improvenetwork performanceVSAvoidscheduling complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies self-service by enabling devices to autonomously participate in coordinated rTWT scheduling without requiring complex centralized control mechanisms. Each device independently detects interference conditions, determines appropriate communication restrictions, and adjusts its behavior accordingly. This distributed self-service approach achieves improved network performance through coordination while avoiding the complexity overhead of centralized scheduling management.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent implements merging by combining multiple functions into a unified interference detection and management mechanism. The same device that performs local interference detection also participates in coordinated rTWT scheduling decisions and enforces communication restrictions. This consolidation of detection, decision-making, and enforcement functions into a single integrated process improves network performance through coordination while reducing the complexity that would arise from separate specialized components.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250220704A1Selective respect for overlapping basic service set coordinated restricted target wake time schedules

Publication Date: 2025.07.03 CISCO TECHNOLOGY INC

AI summary

Coordinated Restricted Target Wait Time (rTWT) scheduling may be provided. Coordinated rTWT scheduling can be performed with an Overlapping Basic Service Set (OBSS), including determining one or more service periods for the OBSS. A coordinated rTWT service period frame is generated comprising one or more service period elements each associated with one of the one or more service periods for the OBSS. The coordinated rTWT service period frame is sent to a Station (STA), wherein the STA is operable to determine whether to communicate during the one or more service periods of the OBSS based on the one or more service period elements.