Optical Emitter Clustering for Moving-Terminal VLC Capacity

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Solution Overview

Problem

Existing optical communication systems using combined transmission in underwater or visible light communication face challenges in improving communication capacity, particularly in accommodating multiple movable terminal apparatuses with fixed base station apparatuses.

Innovation Solution

The system divides light emitting elements into clusters and changes their combinations in a time division manner, allowing flexible allocation and combination of light signals for each terminal apparatus, enabling efficient communication through code division multiple access and space division multiple access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If light emitting elements are fixed in combination for each terminal apparatus, then system stability is improved, but adaptability to terminal movements deteriorates

Engineering Contradiction:

Improvesystem stabilityVSAvoidadaptability to terminal movements

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the light emitting element combinations changeable over time. The base station dynamically reconfigures which light emitting elements are assigned to which terminal apparatuses based on real-time channel conditions and terminal positions. This dynamic reconfiguration allows the system to adapt to terminal movements while maintaining stable communication through systematic resource management.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of light emitting element assignment combinations based on channel state information and terminal positions. By adjusting which light emitting elements are allocated to which terminals according to varying conditions, the system achieves both stability through structured resource management and adaptability through parameter changes in response to terminal movements.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If multiple terminal apparatuses are accommodated simultaneously, then communication capacity is improved, but interference between terminals increases

Engineering Contradiction:

Improvecommunication capacityVSAvoidinterference between terminals

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the available light emitting elements into different groups or clusters that can be independently assigned to different terminal apparatuses. By dividing the resource pool and assigning specific segments to specific terminals, the system increases communication capacity while reducing interference between terminals through spatial and temporal separation of transmissions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs periodic time-division multiplexing where different terminal apparatuses transmit or receive signals in alternating time slots. This periodic action allows multiple terminals to share the same physical medium without simultaneous interference, thereby increasing overall communication capacity while maintaining signal integrity for each terminal.

Inventive Principle:

Principle #19Periodic action

3Productivity

If light emitting elements are reassigned based on channel conditions, then communication efficiency is improved, but system complexity increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where terminal apparatuses report channel state information and position data back to the base station. The base station uses this feedback to make informed decisions about light emitting element reassignment. This feedback-driven approach improves communication efficiency by matching resources to current conditions while managing system complexity through structured information exchange and decision-making protocols.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250358007A1Optical communication apparatus, optical communication method, and optical communication program

Publication Date: 2025.11.20 KYOCERA CORP

AI summary

A base station apparatus includes a plurality of light emitting elements and a controller configured to divide the plurality of light emitting elements into a plurality of clusters, each of the plurality of clusters being constituted by at least one of the light emitting elements. The controller changes a combination of the at least one of the plurality of light emitting elements constituting each of the plurality of clusters in a time division manner and controls the plurality of light emitting elements and causes the at least one of the plurality of light emitting elements in each of the plurality of clusters to transmit the same light signal in an individual time interval.