VLC Data Fragmentation Over DMX-512 Networks
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Solution Overview
Problem
Conventional DMX-512 technology is limited to transmitting 512 bytes of data, which is insufficient for various VLC applications that require transmitting data exceeding this limit, limiting the versatility of VLC systems using LED lighting.
Innovation Solution
The method involves fragmenting VLC data into packets with a DMX header and fragmentation information, allowing for the transmission of data exceeding 512 bytes by including remainder information and a start flag, enabling the receiver to reassemble the data accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If VLC data is transmitted using conventional DMX-512 technology, then the transmission is compatible with existing lighting control networks, but the data size is limited to 512 bytes which is insufficient for various VLC applications
Solution Approach 1:
The patent segments VLC data into multiple 512-byte packets, each with sequential numbering, to transmit data exceeding the DMX-512 buffer limit. The transmitter divides large data sets into manageable chunks that fit within the 512-byte constraint while maintaining compatibility with existing networks, and the receiver reassembles them using the sequence numbers.
Solution Approach 2:
The patent implements preliminary buffering at the receiver side to store incoming 512-byte packets before reassembly. This preliminary action allows the system to accumulate sufficient data packets and reconstruct the complete VLC data frame, enabling transmission of data larger than the standard buffer size without losing compatibility.
2Quantity of substance
If VLC data exceeding 512 bytes is transmitted by fragmenting into multiple packets, then the data size limitation is overcome, but the complexity of data fragmentation and reassembly increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the transmitter sends fragmentation information including packet sequence numbers and total packet counts. The receiver uses this feedback to verify complete reception and properly reassemble packets in the correct order, reducing complexity through structured information exchange.
Solution Approach 2:
The patent changes the parameter of data packet structure by adding header information containing sequence numbers and fragmentation markers to each 512-byte packet. This parameter modification enables automatic reassembly without complex processing, as the embedded metadata guides the reconstruction process.
3Reliability
If data fragmentation information is added to each packet, then accurate reassembly is enabled, but the overhead per packet increases reducing effective data transmission efficiency
Solution Approach 1:
The patent applies partial action by adding only essential fragmentation information (sequence numbers and packet count) to each packet rather than redundant metadata. This minimal overhead approach maintains reliable reassembly while preserving transmission efficiency by avoiding excessive data overhead.
Data Source
AI summary
Disclosed herein are a Visual Light Communication (VLC) method and apparatus using a DMX-512 network. The VLC apparatus includes a DMX signal generation unit and a DMX signal transmission unit. The DMX signal generation unit generates VLC data packets each including a DMX header, fragmentation information, and a data fragment. The DMX signal transmission unit transmits the VLC data packets to an LED lighting apparatus coupled over a DMX-512 network in order to perform VLC.