Visible Light Communication Device Time Slot Modulation
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Solution Overview
Problem
Existing visible light communication systems face interference issues when multiple lighting fixtures illuminate large spaces, causing communication signal failures due to overlapping light rays, and existing solutions require complex synchronization systems that are difficult to install, especially in large-scale premises.
Innovation Solution
A visible light communication device with a control circuit that modulates the intensity of light emitted from LEDs by arbitrarily selecting time slots within a predetermined period for signal transmission, reducing interference by transmitting signals at different times, thus simplifying the system and increasing the likelihood of successful signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lighting fixtures transmit communication signals consecutively in overlapping light areas, then communication signals can be transmitted, but signal interference occurs and receiving terminals fail to successfully receive signals
Solution Approach 1:
The patent divides the communication transmission into periodic time slots, where each lighting fixture transmits signals in specifically assigned time slots rather than continuously. This periodic transmission structure prevents signal overlap and interference in areas where light rays from multiple fixtures overlap, thereby improving communication reliability without requiring complex synchronization systems.
Solution Approach 2:
The patent dynamically assigns time slots to different lighting fixtures based on their spatial positions and light overlap relationships. By making the time slot allocation dynamic rather than fixed, the system can adapt to different installation configurations and optimize communication performance in varying environmental conditions, resolving the contradiction between maintaining reliable communication and avoiding light interference.
2Reliability
If synchronization signals are provided through signal lines to coordinate multiple lighting fixtures, then signal interference is avoided, but system complexity and installation difficulty increase significantly
Solution Approach 1:
The patent enables each lighting fixture to autonomously determine its transmission time slot based on pre-established rules and its own identification information, without requiring external synchronization signals from a central controller. This self-service approach eliminates the need for complex synchronization systems and signal line connections, significantly reducing installation difficulty while maintaining communication reliability through coordinated time slot assignment.
Solution Approach 2:
The patent introduces a time slot assignment mechanism as an intermediary that coordinates transmissions between multiple lighting fixtures without requiring direct signal line connections. This intermediary layer resolves the contradiction by providing a simple, broadcast-based coordination method that avoids the complexity of point-to-point synchronization systems while ensuring reliable communication.
3Ease of operation
If signal lines are added to provide synchronization signals to all lighting fixtures, then communication coordination is achieved, but installation becomes troublesome and difficult in large-scale premises
Solution Approach 1:
The patent extracts the synchronization function from the physical signal line connection and implements it through wireless time slot assignment based on fixture identification. This extraction eliminates the need for extensive signal line installation in large-scale premises while maintaining reliable communication coordination, directly addressing the installation difficulty problem.
Solution Approach 2:
The patent replaces the mechanical signal line connection system with an electronic/time-based coordination system. Instead of physically connecting fixtures through signal lines for synchronization, the system uses time slot assignment based on fixture IDs and spatial relationships, dramatically simplifying installation in large-scale environments while ensuring reliable communication.
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
The solution effectively increases the probability of successful communication signal reception even when receiving terminals are exposed to overlapping light from multiple fixtures, while maintaining a simplified structure and reducing installation complexity.
Implementation Method 1
a light source (3) constituted by at least one light emitting diode (LED) and sends a signal by modulating an intensity of illuminating light
Implementation Method 2
transmitting a communication signal by modulating an intensity of illuminating light
Data Source
AI summary
The visible light communication device includes a control circuit configured to repeat a transmission process of transmitting a communication signal through modulating an intensity of visible light to be emitted from a light source. The control circuit is configured to, in the transmission process, arbitrarily select a time slot for transmission from a plurality of time slots set within a predetermined time period allocated to the transmission process, and transmit the communication signal in the time slot for transmission.