LiFi Node Infrared Visible Light Source Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LiFi systems face challenges in efficiently transitioning between infrared and visible light sources for data transmission while minimizing data loss and ensuring seamless communication, particularly in scenarios requiring high-speed data transfer and power optimization.
Innovation Solution
A LiFi node is designed to automatically transfer output from an infrared light source to a visible light source by providing indications to endpoint devices, allowing for a smooth handover and parallel transmission during the transition, utilizing both sources simultaneously to maintain communication and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the LiFi signal is transmitted via infrared light source, then high-speed data transfer is achieved, but power consumption increases and illumination is not provided
Solution Approach 1:
The system dynamically switches between infrared and visible light sources based on operational requirements. The controller monitors the need for high-speed data transfer versus power saving modes, automatically selecting the appropriate light source to transmit LiFi signals, thus optimizing both performance and energy efficiency
Solution Approach 2:
The visible light source serves dual functions: providing illumination and transmitting LiFi signals. By using the same visible light source for both purposes, the system eliminates the need for separate infrared transmission when illumination is required, reducing component count and power consumption while maintaining high-speed capability
2Use of energy by moving object
If the LiFi signal is transferred from infrared to visible light source, then power consumption is reduced, but data loss may occur during transition
Solution Approach 1:
The controller issues a preliminary indication signal to the endpoint device before actually switching from infrared to visible light source. This advance notification allows the endpoint device to prepare its receiver, ensuring continuous data reception without loss during the transition period
Solution Approach 2:
The system maintains continuous LiFi signal transmission throughout the transition by using both infrared and visible light sources simultaneously for a brief period. This overlapping transmission ensures that data flow never interrupts, preventing data loss while the system switches between light sources
3Illumination intensity
If the visible light source is turned on to provide illumination, then power consumption increases, but the LiFi signal transmission capability is maintained
Solution Approach 1:
The visible light source is designed to perform both illumination and LiFi signal transmission functions simultaneously. When illumination is required, the visible light source activates and continues to transmit LiFi signals, eliminating the need for separate infrared transmission infrastructure and reducing overall system power consumption
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A node (200) is provided for use in a LiFi system (100) to provide LiFi signals to an endpoint device (130). The node (200) comprises a visible light source (220) for emitting modulated visible light and non-modulated visible light to provide illumination, and an infrared light source (210) for emitting modulated infrared light. The node (200) is configured to output a LiFi signal at a first one or more frequencies via the infrared light source (210) for reception by said endpoint device (130). In response to receiving input to provide illumination, the node (200) turns on the visible light source (220) to provide said illumination and automatically transfers an output of the LiFi signal from the infrared light source (210) to the visible light source (220) by outputting the LiFi signal at said first one or more frequencies via the visible light source (220) for reception by said endpoint device (130), and turning off the infrared light source (210).