ZigBee and LED visible light communication based system of Internet of things system and communication method thereof

Abstract

A ZigBee and LED visible light communication based system of Internet of things, includes: actual things in the system of Internet of things, a sensing module, a central information system, and a distributed system and open computer network; the system also includes: a ZigBee communication module, a LED visible light communication module, and a plurality of RFID smart tags. The actual things are provided with the RFID smart tags. The sensing module communicates with the RFID smart tags, and then communicate with the ZigBee communication module though a partial node, a key point and a main line, and the ZigBee communicates with the LED visible light communication module, and the LED visible light communication module communicates with the central information system which communicates with the distributed system and open computer network.

Description

technical field [0001] The invention relates to the technical field of the Internet of Things, in particular to an Internet of Things system based on ZigBee and LED visible light communication. Background technique [0002] The Internet of Things is a kind of aggregated application and technological improvement that appears after the development of modern information technology to a certain stage. It aggregates and integrates various sensing technologies, modern network technologies, artificial intelligence and automation technologies to enable people and things to communicate intelligently and create A world of wisdom. [0003] The Internet of Things technology is known as the third revolutionary innovation of the information industry. The Internet of Things can be divided into three layers: perception layer, network layer and application layer. The perception layer is composed of various sensors and sensor gateways. The main function of the perception layer is to identify...

AI Technical Summary

Problems solved by technology

[0008] (2) Low power consumption determines short transmission distance: ZigBee's transmission distance is in the range of 10-75m. Although it can continue to increase, it will increase the cost of the entire network and increase the network deployment cost of the Internet of Things in a unit area

[0010] (4) Network capacity is limited: a ZigBee network with a star structure can accommodate up to 254 slave devices and a master device. In an ideal state, nearly a hundred ZigBee networks can exist in an IoT system in an area at the same time, but for large The network capacity of the Internet of Things cannot support large-scale regional environments such as oceans, lakes, water patterns, desert changes, forest fires, and Antarctic resource investigations, and communication between regions must be completed by other communication methods. There is also a lack of network support in large areas. The visible light communication system integrating ZigBee can solve the above problems and realize the transmission of huge information flow data to GPRS and the Internet.

[0011] (5) Poor security: ZigBee wireless network is transmitted through specific radio waves, so within the effective range of this transmission frequency, anyone with suitable receiving equipment can capture the signal of this frequency, which will inevitably affect To the security of a local area network, unless you deploy end-to-end encryption technology, you cannot guarantee the so-called real secure communication of the RF-based Internet of Things network. This point, the Internet of Things system of visible light communication has very high security and simplicity

[0012] (6) Unstable and unreliable: the harsh environment severely attenuates ZigBee wireless signals, so the instability of wireless networks is inevitable

[0013] (7) Delay problem: Since ZigBee uses random access to the MAC layer and does not support time-division multiplexing channel access, it cannot support some real-time services well, which limits the application of the Internet of Things system Integration, because many compatible devices use time-division multiplexing mode

Therefore, ZigBee technology can be applied to common wireless control (such as industrial control occasions, etc.), but for high-performance scientific research fields, the time delay is too long, which cannot meet the needs of high-performance laboratories, astronomical detection, aerospace, and space exploration. , the needs of high-tech military fields, and the delay of visible light communication is very short compared with ZigBee, almost no delay, so the use of visible light communication technology in the nodes and key nodes of the main line has a wider application prospect in the high-tech field

[0014] (8) If it is a mobile point, it will not be possible to build a communication transmission network for the Internet of Things

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