Smart Home Core Wireless Technology - Wireless Network Technology

Wired network connection has certain limitations in space. How to securely connect various mobile devices to the network? Wireless network technology plays a crucial role in it. It eliminates the restriction of the location of the wired network to the access equipment and also saves the cost of the corresponding cable signal transmission facilities such as optical fiber and cable. This means that the Internet of Things has to do with everything in the world, ranging from oil tankers, trains, and airplanes to small, temperature, humidity, pressure sensors, microprocessors, and microcontrollers. The Internet of Things normalizes the physical world and the information world and integrates information collection and decision making and implementation. Therefore, higher speed, more reliable, cheaper, and more popular point-to-point interconnection information transmission means are necessary for the Internet of Things.

Smart home wireless network technology

The wireless network system for smart homes needs to meet the characteristics of low power consumption, stability, and easy to expand the grid. As for the transmission speed, it is obviously not the focus of such applications.

At present, several common smart home wireless communication methods in the market include ZigBee, WI-FI, and Bluetooth.

1) ZigBee. The basis of ZigBee is IIIEE 802.15. However, the IEEE only deals with low-level MAC layer and physical layer protocols. Therefore, the ZigBee Alliance extends the IEEE to standardize its network layer protocols and APIs. ZigBee is an emerging short-range, low-rate, and low-power wireless network technology. It is mainly used for short-distance wireless connection. It has low complexity, low power consumption, low-speed, low-cost, ad hoc network, and high reliability. Features such as over-the-horizon are mainly suitable for applications such as automatic control and remote control, and can be embedded in various devices. In short, ZigBee is a cheap, low-power, ad hoc short-range wireless communication technology.

2) WI-FI. In fact, it is the other name of IEEE 802.11b. It is an industry term published by an organization named "Wireless Ethernet Compatibility Alliance (WECA)" and translated as "Wireless Compliant Authentication." It is a short-range wireless transmission technology capable of supporting Internet-access radio signals within a few hundred meters. Its biggest feature is to facilitate people access the Internet anytime, anywhere. However, for smart home applications, the disadvantages are obvious - high power consumption and professional networking. High power consumption is a fatal flaw in the deployment of low-Power Sensors anytime, anywhere, so although WI-FI is very popular, it only plays a complementary role in smart home applications.

3) Bluetooth. As a cable replacement technology, Bluetooth has the characteristics of low cost and high speed. It can interconnect computers, mobile phones and other communication terminals embedded with a Bluetooth chip to provide voice and digital access services and realize information. Automatic exchange and processing. In addition, Bluetooth is cheaper to use and maintain than any other wireless technology.

In general, wireless networks mainly have the following advantages:

1) Easy to install. Without complicated wiring, it is easy to realize networking of home devices and realize the information exchange between “things and things” and “people and things”, and then easily realize the intelligent control of home devices.

2) Simple maintenance. Since there is no complicated wiring, the system maintenance of the smart home is very simple and it is easy to maintain without damaging the wall and other facilities.

3) Wireless automatic networking. It can realize wireless short-distance communication transmission, perceive information through self-organizing networking to realize information transmission, and has the ability of automatic networking and self-repair, eliminating manual inconvenience between master and peripheral devices, greatly simplifying intelligence. The debugging of the home system makes the smart home system truly intelligent.

4) to achieve two-way communication capabilities. Security alarms and other modules that require two-way communication can access the smart home system through a wireless network, completely eliminating the wiring troubles.

The wireless network includes both global voice and data networks that allow users to establish long-distance wireless connections. It also includes infrared technology and radio frequency technologies that are optimized for close-range wireless connectivity. It is similar to the use of wired networks. The major difference between the two is that The transmission medium is different. The use of radio technology to replace the network cable, and the wired network can be backed up.