Visibility Frame Output for VLC Link Re-establishment
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Solution Overview
Problem
In Visible Light Communication (VLC) systems, communication links can be disrupted due to external factors or terminal movement, making it difficult to maintain connection, especially in unicast, multicast, and broadcast modes, where multiple user terminals share the same time slots, leading to challenges in recognizing link disconnections and affecting data transmission.
Innovation Solution
A method and apparatus for outputting a visibility frame in VLC systems, where a VLC device determines the visibility frame output type based on the communication mode and transmits this information to other devices, allowing for the detection and re-establishment of communication links without interfering with other terminals' data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user terminals share the same time slots in VLC systems, then communication efficiency is improved, but it becomes difficult to recognize link disconnections and affects data transmission
Solution Approach 1:
The patent introduces a visibility frame as an intermediary signal that is transmitted separately from data frames. This visibility frame serves as a dedicated mediator to indicate link status without interfering with data transmission in shared time slots, allowing terminals to detect link disconnections while maintaining communication efficiency
Solution Approach 2:
The patent segments the communication signal into two distinct parts: data frames for information transmission and visibility frames for link status indication. This segmentation allows the system to maintain high communication efficiency through shared time slots while simultaneously providing reliable link status detection through dedicated visibility frames
2Reliability
If communication links are aligned in both directions for smooth transmission, then data transmission reliability is improved, but terminal movement and external factors still cause link disconnections
Solution Approach 1:
The patent implements a feedback mechanism where visibility frames are continuously transmitted and acknowledged. When a terminal detects link disconnection through the absence of visibility frames or receives a link release notification, it can request re-alignment. This feedback loop enables the system to adapt to terminal movement and external factors while maintaining transmission reliability
3Reliability
If a visibility frame is output to inform link disconnection, then link re-establishment is enabled, but it may interfere with other terminals' data transmission
Solution Approach 1:
The patent extracts the link status indication function from the data transmission process by using dedicated visibility frames. These visibility frames are transmitted in separate resource allocations, taking out the control function from the data stream and preventing interference with other terminals' data transmission while enabling reliable link re-establishment
Data Source
AI summary
A method and apparatus are provided for outputting a visibility frame for a communication link connection during a communication link release in a Visible Light Communication (VLC) system. A transmitting-side VLC device determines a visibility frame output type according to a communication mode to be performed. The communication mode and the visibility frame output type are transmitted to a receiving-side VLC device. The receiving-side VLC device is communicated with according to the communication mode and it is determined whether a communication link is released while performing communication according to the communication mode. When the communication link is released, outputting a visibility frame according to the visibility frame output type.