Abstract of Wifi Technology in Smart Home

With the continuous maturity of WiFi technology and the growing development of smart home, the use of WiFi technology to control home systems on smartphones will become an important part of people’s lives in the future. More and more enterprises have joined the industries of developing smart home devices. More and more enterprises have joined the ranks of developing smart home devices. This article introduces the concept of WiFi technology and the concept of smart home, and expounds its development trend.

Introduction of Wifi Technology in Smart Home

With the rapid development of science and technology, the world has stepped into the era of informationization. Due to the continuous improvement of technology, people are more comfortable with home conditions and are more convenient and safer. As a result, smart buildings and homes are spawned. Smart home is through a home network of bus home devices connected to the information related to the implementation of network monitoring and control in order to manage centralized or off-site. At present, the development trend of smart home is from centralized control to distributed control. There are four mainstream wireless technologies currently used in smart home: Bluetooth, WiFi, Z-Wave, Zig-bee. The most competitive technology is WiFi technology and Zig-bee. Therefore, this article will introduce the smart home control system based on WiFi.

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WiFi technology principle

The full name of WiFi is Wireless Fidelity, it is 802.11b wireless network specification and a short-range wireless transmission technology that aims to improve the interoperability of wireless network products based on the IEEE802.11 standard. WiFi typically uses 2.4G UHF or 5G SHF ISM RF bands. Wireless LAN connections are usually protected by password, but they can also be open, pass wordless, and network-wide devices can be connected.
The principle of the smart home control system based on WiFi is that a number of wireless smart nodes form a home area network, each smart sub-node includes a WiFi receiving module, and the home gateway has a wireless WiFi transmitting module. Receive and transmit module communicate through WiFi.

The advantages of WiFi are as follows:

  • It covers a wide area and has a long effective distance. The communication distance in the open area is up to 305m, and the communication distance in the closed area is 76-122m. It can be applied not only to the local rooms but also to the entire buildings.
  • Transmission speed is very fast, up to 54Mbps. In addition to the low cost, it has low power consumption, in line with the modern “green low-carbon” appeal. According to the research, the WiFi signal belongs to a kind of microwave and has little impact on the human body. The impact of the radiation generated by Wi-Fi on the human body is negligible within a safe range.

However, since WiFi uses RF technology, air is used as a medium to transmit and receive data, signals that transmitted through radio waves are easily disturbed by external environments, and the security is not high, so they are not suitable for smart home control systems that require high security.

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Smart home

Concept and development process

The concept of smart home originated in the United States in the early 1980s, calling it Smart Home. It has undergone four generations of development: the first generation completes home networking through coaxial lines and two cores to achieve lighting, curtains and a small amount of security control; The second generation is through bus and IP technology networking, to be able to complete the video
intercom and security business; The third generation is a centralized intelligent control system, by the central control computer to complete security, measurement and other functions; The fourth generation that is based on the Internet of things technology can be based on user needs to achieve personalized features.

Smart home should be integrated into four parts: building automation systems, communications systems, room automation systems, computer-aided equipment management system. Smart home control system has intelligent, information-oriented functions, control functions, communication functions, monitoring functions, timing functions and abnormal protection, leakage protection. China introduced the concept of smart home from the late 1980s. China started to promote the construction of intelligent residential quarters through the concept and technology of intelligent buildings. Adopting the intelligent residential district system mode of “smart residential as the basic unit, intelligent building’s management center as the central node, and Hybrid Fiber Coax(HFC) network as the data transmission medium”, it has the functions of Safety Automation (SA), Communication Network (CN) and Management Automation (MA) and other functions that Satisfy residential needs.

Development Opportunities

Thanks to socio-economic progress, government support and technological development and business
competition, smart home has been able to develop rapidly in recent years.

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Social and economic progress

Under the influence of the reform and opening up and economic globalization, the economy of our country has shifted from a high-speed growth stage to a high-quality development stage. As the economic level continues to rise, people’s demands for living quality are getting higher and higher. Nowadays, the younger generation is more receptive to advanced technologies, which provides a solid foundation for the development of smart home.

Support of the government

Since 2010, the state and the government have promulgated many policies to promote the development of the smart home industry. In 2010, the State Council passed the “Decision on Accelerating the Fostering and Development of Strategic Emerging Industries” issued by the State Council in 2011, and the Ministry of Industry and Information Technology promulgated the “Twelfth Five-Year Plan for Development of the Internet of Things” in 2011, explicitly including smart home in the demonstration projects of 9 major key areas. It is precisely because of state support that smart home as a new industry can be developed so rapidly, largely to help improve the technology and increase the popularity of smart home.

Business competition

In other countries, Apple, Google and other leading enterprises have long been put into the smart home industry. In China, Alibaba, 360, Xiaomi and Jindong started to think of smart home as an important area for future development. The emergence of many competitors in some ways to promote the development of the industry has a positive lead role.

part of Journal: Conference Series(Jie Ding1, Tian-ran Li1 and Xue-Li Chen1 “Nanjing Normal University,Nanjing ,China”)