TWT Frame Signaling for Dynamic RSP Control in Wireless LAN

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Solution Overview

Problem

Existing wireless LAN systems face challenges in satisfying low-latency traffic requirements due to legacy STAs that do not support Restricted Service Period (RSP) and channel conditions, leading to unsatisfied low-latency traffic needs.

Innovation Solution

A method and apparatus for signaling RSP using a Target Wake Time (TWT) information frame, allowing for the suspension or resumption of scheduled RSP without adding new fields, to accommodate both legacy and RSP-supporting STAs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If RSP is allocated to satisfy low-latency traffic requirements, then low-latency traffic performance is improved, but legacy STAs that do not support RSP cause the RSP requirements to be unsatisfied

Engineering Contradiction:

Improvelow-latency traffic delayVSAvoidRSP requirement satisfaction

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent implements dynamic RSP suspension and resumption mechanisms that allow the RSP to be temporarily suspended when legacy STAs are detected and resumed when they leave the BSS. This dynamic adjustment resolves the contradiction by adapting the RSP operation to the presence or absence of legacy STAs, ensuring low-latency traffic requirements are met when possible while maintaining compatibility with legacy devices.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameters of RSP by introducing suspension and resumption states through TWT information frame exchanges. When legacy STAs are present, the RSP parameter transitions from active to suspended state, and when they leave, it transitions back to active, thereby resolving the conflict between supporting legacy devices and satisfying low-latency requirements.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If new fields are added to TWT information frame for RSP signaling, then RSP control capability is improved, but frame structure complexity increases

Engineering Contradiction:

ImproveRSP signaling capabilityVSAvoidTWT frame structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent makes existing TWT information frame fields multi-functional by assigning them dual purposes: their original TWT scheduling functions and new RSP suspension/resumption signaling functions. This approach improves RSP control capability without increasing frame structure complexity, as the same fields serve multiple functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges RSP control signaling with existing TWT information frame structures by utilizing reserved bits and existing field combinations. This integration allows RSP suspension and resumption to be signaled within the existing frame structure, avoiding the need for separate new fields and maintaining structural simplicity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12490308B2Method and apparatus for signaling RSP on basis of TWT information frame in wireless LAN system

Publication Date: 2025.12.02 LG ELECTRONICS INC

AI summary

Suggested are a method and an apparatus for signaling RSP on the basis of a TWT information frame in a wireless LAN system. Specifically, a first receiving STA receives a beacon frame from a transmitting STA. The first receiving STA transmits a first TWT information frame to the transmitting STA. The beacon frame includes allocation information for the RSP. The first TWT information frame includes a first All TWT field, a first TWT Flow identifier field, and a first Next TWT field. When the first All TWT field is set to 1, the first TWT Flow identifier field is set to 2, and the first Next TWT field is set to 0, the RSP is stopped.