Multi-AP Joint Transmission Synchronization for Edge STA SINR

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Solution Overview

Problem

Existing wireless networks with multi-AP systems face challenges in controlling interference and improving Signal-to-Interference-Plus-Noise Ratio (SINR) for wireless stations (STAs) at the edge of networks, particularly in overlapping Basic Service Sets (OBSS) zones, where a useful signal becomes interference for other STAs.

Innovation Solution

Implementing multi-AP coordination through joint transmission schemes that synchronize and distribute data among participating APs, including a Master AP and Slave APs, to enhance SINR and reduce interference by converting interfering signals into desired signals, using a frame with JT data and a unique identity for synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multi-AP joint transmission is implemented, then SINR levels and throughput for STAs are enhanced, but device complexity and coordination overhead increase

Engineering Contradiction:

ImprovethroughputVSAvoidcoordination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the multi-AP system into a Master AP that generates and distributes JT data to Slave APs. This segmentation allows complex joint transmission coordination to be managed centrally by the Master AP while Slave APs execute simpler local operations, reducing overall system coordination complexity while maintaining high throughput benefits

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The Master AP performs preliminary actions by generating JT data and distributing it to Slave APs before the actual joint transmission occurs. This preliminary data distribution and synchronization enable the Slave APs to execute joint transmission without real-time complex coordination, reducing coordination overhead during the transmission phase

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If APs transmit signals to STAs at network edges, then coverage is improved, but interference control becomes difficult

Engineering Contradiction:

Improvecoverage areaVSAvoidinterference

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent merges transmissions from multiple APs (Master AP and Slave APs) into a coordinated joint transmission to STAs at network edges. By combining signals constructively through synchronization and data distribution, the system extends coverage to edge STAs while the coordinated transmission ensures interference is managed rather than uncontrolled

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent converts the potentially harmful interference that edge STAs experience from neighboring AP transmissions into beneficial signal reinforcement. Through joint transmission coordination, signals from what would normally be interfering APs are synchronized and combined constructively at the target STA, turning interference into enhanced signal strength and extended coverage

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12587237B2Communication apparatus and communication method for multi-AP joint transmission

Publication Date: 2026.03.24 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

An access point (AP) includes circuitry, which, in operation, generates a frame that includes joint transmission (JT) data and a JT identity that uniquely identifies the JT data. The access point further includes a transmitter, which, in operation, transmits the frame to one or more APs that jointly transmit the JT data to a communication apparatus.