Non-coherent Joint Transmission for Wireless APs

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Solution Overview

Problem

Existing wireless networks face challenges in achieving reliable data transmission due to the requirement of tight synchronization between access points (APs) for joint transmission, which may not always be possible.

Innovation Solution

A non-coherent joint transmission (NCJT) scheme that allows multiple APs to transmit the same data to a station without requiring tight synchronization, enabling more reliable data decoding even under unfavorable conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tight synchronization is implemented between APs for joint transmission, then data transmission reliability is improved, but system complexity and implementation difficulty increase

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidsynchronization system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the tight synchronization requirement from the joint transmission system. By allowing APs to transmit data independently without strict timing coordination, the system eliminates the complex synchronization infrastructure while maintaining transmission reliability through diversity combining at the receiver

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The receiver acts as an intermediary that combines signals from multiple APs using diversity combining techniques. This mediator processes the independently transmitted signals from APs without requiring them to be synchronized, resolving the contradiction by shifting the coordination function from transmitters to receiver

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If tight synchronization is required between APs, then transmission performance is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvetransmission performanceVSAvoidAP coordination ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Each AP independently transmits data without needing to coordinate with other APs. The APs serve themselves by autonomously transmitting signals, eliminating the need for complex inter-AP coordination mechanisms while maintaining transmission performance through receiver-side signal combining

Inventive Principle:

Principle #25Self-service

3Productivity

If joint transmission is implemented with multiple APs, then data rate is improved, but synchronization requirements increase system difficulty

Engineering Contradiction:

Improvedata rateVSAvoidsynchronization difficulty

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent segments the transmission process into independent AP transmissions rather than requiring coordinated simultaneous transmission. Each AP transmits independently segmented signals that are later combined at the receiver, achieving high data rates through parallel transmission without synchronization complexity

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250089093A1Non-coherent joint transmission (NCJT) scheme in a wireless network

Publication Date: 2025.03.13 NEWRACOM INC

AI summary

An embodiment is method performed by a sharing access point (AP) to initiate a non-coherent joint transmission (NCJT). The method includes transmitting a backhaul data PPDU that includes data intended for a station (STA) to a shared AP via a backhaul link and transmitting a NCJT sounding trigger frame to the shared AP via the backhaul link to cause the shared AP to participate in the NCJT, wherein the NCJT involves a plurality of APs, including the shared AP, transmitting NCJT PPDUs that include the data intended for the STA to the STA at different times.