Visible Light Communication System for Location-Based Content Delivery
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Solution Overview
Problem
Current visible light transmission systems using cameras for information transfer face challenges in efficiently transferring large volumes of information due to limited bit rates, making it difficult to effectively communicate data such as sounds and images.
Innovation Solution
An information provision system comprising multiple transmission devices, a terminal device, and a server, where the transmission devices modulate identification information using light, and the terminal device acquires and transmits this information along with location data to the server, which associates and stores this information to determine and deliver relevant content to the terminal device based on location, thereby optimizing content delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If visible light transmission is used with camera-based reception, then information transfer is achieved, but the bit rate is limited to approximately 15 bits/second (or 45 bits/second with RGB modulation)
Solution Approach 1:
The system segments the information transfer process into two distinct phases: (1) optical transmission of identification information at low bit rate, and (2) wireless transmission of full content data at high bit rate. This segmentation allows the optical channel to handle only essential identification data while the bulk content transfer utilizes the high-capacity wireless channel, thereby resolving the bit rate limitation.
Solution Approach 2:
The server acts as an intermediary that receives identification information from the terminal device, queries the content database, and retrieves the corresponding full content. This intermediary role enables the system to bypass the bit rate bottleneck by using the server's high-speed wireless connection for actual content delivery, while the optical link only handles lightweight identification transmission.
2Loss of information
If the terminal device photographs transmission devices continuously to acquire information, then information can be received, but the time required to acquire large volumes of information is excessive
Solution Approach 1:
The system extracts only the essential identification information from the optical signal, separating it from the full content data. By transmitting only the compact identification string optically and retrieving the complete content through the server's wireless connection, the system dramatically reduces the time required for information acquisition while maintaining complete information integrity.
Solution Approach 2:
The server pre-stores content in its database and prepares it for rapid retrieval. When identification information is received from the terminal device, the server can immediately query and retrieve the corresponding pre-prepared content through high-speed wireless transmission, eliminating the need for the terminal device to continuously photograph and process large volumes of data in real-time.
3Adaptability or versatility
If multiple transmission devices are deployed at different locations, then content delivery can be location-based, but the system complexity increases
Solution Approach 1:
The terminal device autonomously performs location acquisition and automatically transmits both its location information and received identification information to the server. The server then autonomously queries the content database and retrieves appropriate content based on the provided location data. This self-service mechanism eliminates the need for complex manual configuration of transmission devices while enabling location-based content delivery.
Solution Approach 2:
The server performs multiple functions: it receives identification information from terminal devices, acquires location information, queries the content database, retrieves appropriate content, and transmits it back to terminal devices. This multi-functional design centralizes complexity in the server, allowing transmission devices to remain simple while still achieving location-based content delivery capability.
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
This approach reduces the time required to acquire information by optimizing content delivery based on location, improving the efficiency of information transfer even with relatively low bit rates.
Implementation Method 1
a first transmitter modulating identification information for identifying the content and transmitting the modulated element by means of light as a transmission medium
Implementation Method 2
a light receiver receiving the element transmitted from the first transmitter by means of light as a transmission medium
Data Source
AI summary
For setting a tag ID in association with a content supposed to be provided to a portable terminal, the server acquires the location information of an illumination device of which the content is already stored in the memory and sets a tag ID in association with an illumination device that is away from the location presented by the location information by a given or longer distance. Then, the server associates and stores in the memory the set tag ID, location information of the illumination device transmitting the tag ID, content supposed to be provided. Subsequently, the server receives the tag ID and location information transmitted from a portable terminal, determines the content to transmit based on the received location information and the element stored in the memory, and transmits the determined content to the portable terminal.