The emergence of ZigBee technology completely solved the problem of network transmission in the last 100 meters of smart home. Zhu Jungang, chairman of Nanjing IOT, said that ZigBee technology is a kind of wireless technology. The last 100 meters of ZigBee's solution status in smart homes does not mean that ZigBee will replace WiFi or Bluetooth. Each wireless technology has market positioning.
Zhu Jungang believes that ZigBee has certain security. As of today, ZigBee technology has not been set a precedent in the world. Some people or peers and even competitors will say that ZigBee is safer so far because its current utilization rate is not high and its market share is not high, but we must know that the ZigBee network was originally applied in the industrial field, and the industrial field. The value of the data is very sensitive to many people. The peers will try to get the data, so the method of breaking it will be more clear, but there have been no such cases. Second, ZigBee has self-healing capabilities. Because it is a mesh network, if a device is broken or the node is broken, the following devices will automatically find other nodes and automatically form a network. The third is that its network size is relatively large. Will carry the future application of the family. The fourth is its low power consumption, and as the chip manufacturing capability increases, its power consumption will be lower and lower.
The emergence of intelligent lighting is accompanied by the development of technologies such as Internet of Things, LED lighting, and wireless communication. Its typical feature is the individually controllable, convenient and flexible scene setting of lighting equipment, and can be seamlessly interfaced with other intelligent information systems (such as Intelligent sensor network, security monitoring network, intelligent energy network, etc., to meet different intelligent lighting needs with novel rendering mode. Therefore, intelligent lighting system needs to provide convenient and easy-to-operate system upgrade and transformation plan to adapt to the changing needs. Low-power wireless communication control systems are a key part of this.
As an important part of smart engineering, intelligent lighting is also a good application form in the Internet of Things system. The intelligent lighting solution based on low-power wireless transmission will be the future development trend. At present, the market environment is becoming more and more mature, and the establishment of relevant standards will be the boost to promote the development of the intelligent lighting market.
At present, there are many protocols used in the field of low-power wireless transmission, and a unified transmission specification has not yet been formed. The following is an example of the comparison of two current mainstream low-power wireless transmission protocols, Zigbee and Jennet-IP, to analyze the characteristics and development direction of low-power transmission protocols.
1, Zigbee agreement
The Zigbee protocol is characterized by small size, low cost, low power consumption and low transmission rate. It was jointly proposed by Motorola (USA), Mitsubishi (Japan), Philips (Netherlands), Invensys (UK) and other companies in 2002. Developed low-power wireless communication protocol.
The network layer and media access layer of the Zigbee protocol use the IEEE802.15.4 protocol as the protocol standard, and the IEEE802.15.4 protocol is adopted by the IEEE802 Wireless Personal Area Network (WPAN) group (established in December 2000) in 2003. Officially released in December, including the protocol standards adopted by its physical layer and MAC layer. The Zigbee Alliance released the Zigbee wireless communication protocol by defining the network layer and the application layer based on the physical layer (PHY) and the medium access layer (MAC) defined by IEEE802.15.4 in December 2004.
(1) The main application features of the Zigbee wireless communication protocol are as follows:
1 low power consumption: Compared with other wireless network protocols, Zigbee protocol devices have very low power consumption, so the device life is extended a lot;
2 High reliability: The Zigbee protocol has a mechanism to avoid collisions. By adopting a dedicated time gap method, collisions in the process of transmitting data are avoided. In addition, an automatic routing mode is adopted in the transmission to improve transmission reliability.
3 low transmission rate: the Zigbee protocol supports a transmission rate ranging from 10 kb/s to 250 kb/s;
4 transmission delay is small: Zigbee protocol optimizes the application with high time delay requirement, which shortens the communication delay greatly. In addition, the time for Zigbee protocol device to activate from sleep state is also reduced a lot;
5 Supporting a large number of nodes: In theory, the Zigbee protocol network can support a maximum capacity of 65,000 nodes;
6 Security: The Zigbee protocol can provide corresponding security mechanisms for specific application needs. The AES.128 algorithm is used to protect data in CCM mode.
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