C-OFDMA Multi-AP Scheduling via TWT Resource Units

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Solution Overview

Problem

The increased number of spatial streams in next-generation wireless LAN systems requires improved signaling techniques to effectively utilize the enhanced bandwidth and throughput, particularly in multi-AP communication scenarios.

Innovation Solution

A method for performing C-OFDMA operation in multi-AP communication, involving a scheduling approach based on minimum allocated resources, which includes a static or dynamic scheduling method to coordinate resource units among multiple access points, using a Target Wake Time (TWT) framework to optimize signal transmission and reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If C-OFDMA scheme is applied to schedule multiple APs according to minimum allocated resources, then overall network throughput is improved, but device complexity increases due to scheduling control mechanisms

Engineering Contradiction:

Improveoverall network throughputVSAvoidscheduling control complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The frequency spectrum is divided into multiple resource units (RUs), each allocated to a specific AP for dedicated transmission. This segmentation allows multiple APs to transmit simultaneously without interference while maintaining manageable control through standardized RU allocation mechanisms defined in the 802.11ax standard.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sharing AP performs preliminary scheduling decisions by allocating specific RUs to each AP before actual data transmission occurs. This advance resource allocation enables coordinated operation and prevents conflicts during the transmission phase, improving throughput without requiring complex real-time control.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If increased number of spatial streams is used to enhance bandwidth, then network capacity is improved, but signaling complexity increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidsignaling technique complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The C-OFDMA mechanism serves multiple functions simultaneously: it enables frequency division multiplexing, provides interference coordination between APs, and maintains backward compatibility with existing 802.11ax standards. This multi-functionality reduces the need for separate signaling mechanisms for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4668658A1Method and apparatus for performing c-ofdma operation in multi-AP communication in wireless LAN system

Publication Date: 2025.12.24 LG ELECTRONICS INC

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AI summary

Proposed are a method and an apparatus for performing a C-OFDMA operation in multi-AP communication in a wireless LAN system. In particular, a first transmission STA transmits a TWT request frame to a second transmission STA. The first transmission STA receives a TWT response frame from the second transmission STA. The first transmission STA acquires a first SP on the basis of the TWT response frame. The first transmission STA transmits and receives, during the first SP, a signal on a second frequency resource that is different from a first frequency resource allocated to a third transmission STA. The second transmission STA is an AP that controls communication between multiple APs. The first and third transmission STAs are APs which share information regarding the communication between the multiple APs with the second transmission STA.