Collocated Radio Synchronization on Shared Channels

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Solution Overview

Problem

In wireless radio communications, collocated radios often interfere with each other due to unsynchronized transmission and reception on shared channels, leading to suboptimal signal-to-noise ratios and interference issues.

Innovation Solution

Implementing a system where collocated radios synchronize their transmit and receive time periods and balance their on-axis responses to operate on the same channel, using features like side lobe rejection shrouds and GPS synchronization to minimize off-axis interference and ensure equal on-axis responses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If collocated radios transmit on shared channels without synchronization, then channel utilization is improved, but signal-to-noise ratio deteriorates due to interference

Engineering Contradiction:

Improvechannel utilizationVSAvoidsignal-to-noise ratio

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements synchronized periodic transmission slots where collocated radios transmit at specific time intervals rather than continuously. This periodic action allows radios to share the channel in an organized manner, improving channel utilization while maintaining signal quality through coordinated transmission timing.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary synchronization of transmit and receive time periods before actual data transmission. By pre-coordinating transmission schedules and balancing on-axis responses in advance, the system prevents interference before it occurs, ensuring both high channel utilization and maintained signal-to-noise ratio.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If collocated radios operate without balanced on-axis responses, then device complexity is reduced, but interference between radios increases

Engineering Contradiction:

Improvesynchronization mechanism complexityVSAvoidradio interference

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent adjusts transmission parameters such as power levels and timing offsets to balance on-axis responses among collocated radios. By changing these parameters, the system equalizes the effective isotropic radiated power (EIRP) of each radio, reducing mutual interference while maintaining relatively simple device architecture.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If off-axis response is not reduced, then manufacturing precision requirements are lowered, but signal-to-noise ratio deteriorates

Engineering Contradiction:

Improveantenna alignment precisionVSAvoidsignal-to-noise ratio

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent converts the potentially harmful off-axis radiation into a beneficial pattern by designing antenna elements that deliberately shape their radiation patterns. The off-axis lobes are controlled to point away from other collocated radios, transforming what could be interference into a non-interfering radiation pattern that maintains high signal-to-noise ratio without requiring extreme manufacturing precision.

Inventive Principle:

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

Data Source

PatentUS11888589B2Synchronized transmission on shared channel

Publication Date: 2024.01.30 MIMOSA NETWORKS

AI summary

Simultaneous transmission on a shared channel by a plurality of collocated radios is provided herein. The two or more radios are collocated with one another and are communicating with two far radios over a pair of long range wireless links. The two or more radios are configured to transmit and receive in synchronization with one another on a same channel. An off-axis response for each of the two or more radios is reduced compared to their on-axis response for improved signal to noise ratio, and the on-axis response the two or more radios are substantially equal to one another.