Time-Sharing VLC System for Overlapping Service Areas
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Solution Overview
Problem
In Visible Light Communication (VLC) systems, adjacent light sources providing different services often experience data collisions in overlapping service areas, leading to service disruptions and resource inefficiencies, as they cannot provide normal VLC services in non-service areas.
Innovation Solution
A time-sharing VLC system that dynamically allocates time slots to light sources based on user services and communication environments, allowing for logical grouping of light sources into cells to prevent data collisions and ensure seamless service delivery, even in overlapping areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple adjacent light sources provide different services simultaneously, then service diversity is improved, but data collisions occur in overlapping service areas
Solution Approach 1:
The service area is segmented into multiple cells, each served by a specific light source. Each light source is assigned a unique cell identifier, and the system divides the overlapping service areas into distinct cells to prevent data collisions while maintaining service diversity.
Solution Approach 2:
The system uses periodic time slots for data transmission, where each light source transmits data in its allocated time slot. This periodic transmission scheme allows multiple light sources to operate simultaneously without causing data collisions in overlapping areas.
2Area of stationary object
If light sources are installed to cover broad service areas, then coverage is improved, but resource waste occurs in non-service areas
Solution Approach 1:
Each light source is configured with local quality parameters including a specific service area, cell identifier, and time slot allocation. The system activates only the light sources and time slots needed for current service delivery, avoiding resource waste in non-service areas while maintaining broad coverage.
Solution Approach 2:
The system dynamically allocates time slots and activates light sources based on real-time service requirements and terminal locations. This dynamic configuration allows the service coverage area to expand when needed while minimizing resource consumption in areas where services are not currently required.
3Productivity
If time slots are allocated dynamically based on terminal locations, then service efficiency is improved, but system complexity increases
Solution Approach 1:
The system implements self-service mechanisms where light sources automatically transmit their service area and cell identifier information, and terminals autonomously select appropriate light sources based on their locations. This reduces the complexity of centralized control while maintaining high service efficiency through dynamic time slot allocation.
Solution Approach 2:
The system uses feedback mechanisms where terminals report their locations and received signal qualities, and the base station adjusts time slot allocations accordingly. This feedback loop enables dynamic optimization of service efficiency while keeping system complexity manageable through standardized feedback protocols.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient use of light sources, prevents resource waste, and ensures continuous VLC services by dynamically managing time slots and light source configurations based on user services and terminal locations, allowing for various services to be provided without data collisions.
Implementation Method 1
The photodiode 25 senses an optical signal provided from the external device, converts the sensed optical signal into an electrical signal
Data Source
AI summary
A time-sharing Visible Light Communication (VLC) system is provided. Two or more light sources transmit data received from one or more VLC terminals located in its service area to a communication control device, and transmits data received from the communication control device to the one or more VLC terminals. The communication control device determines and groups at least one of the two or more light sources to be included in a cell according to a generated user service, maps the grouped at least one light source to the cell, allocates a time slot used to provide the user service to the cell, transmits data associated with the user service to at least one of the one or more VLC terminals through the at least one light source mapped to the cell using the allocated time slot, detects a location of the at least one VLC terminal located in a service area of the cell on a real-time basis, and remaps the cell according to the detected location.