Wireless WIFI Technology Solutions for Smart Home Applications

With the continuous development of science and technology, the local area network is gradually developing toward the direction of wireless and multi-network integration. In the process of rapid development of multi-network integration, it has driven the wide application of multiple wireless technologies. WIFI is one of them. One.

At present, the smart home industry is also in full swing. It can be foreseen that the development of smart homes in the future will no longer be limited to the remote control of household appliances, lighting, etc. The embedded smart terminals, wireless WIFI technology, and the widespread application of the Internet will surely Making home control more automated, intelligent, and humane will certainly change the model of traditional smart homes and push smart homes to a stage of rapid development.

One: WIFI technology principle and application

WiFi's full name is WirelessFidelity. Its greatest advantage is its high transmission speed, which can reach 54Mbps. In addition, its effective distance is also very long. Its main features are: high speed and high reliability. In open areas, the communication distance can reach 305 meters. In the closed area, the communication distance is 76 meters to 122 meters, which is convenient for integration with the existing wired Ethernet network. The cost of networking is lower. The outstanding advantages of Wi-Fi technology are:

First, radio waves cover a wide range, and WiFi's radius can reach 100 meters. The office can use it in the entire building, needless to say.

Second, the transmission speed is very fast and can reach 11 mbps, which is in line with the needs of personal and social information.

Compared with wired networks, it has many advantages:

Without wiring

The main advantage of WiFi is that it does not require cabling and is not limited by cabling conditions. Therefore, it is very suitable for the needs of mobile office users and has broad market prospects. At present, it has expanded from more traditional industries such as healthcare, inventory control and management services to more industries, and has even begun to enter homes and educational institutions.

health and safety

The use of wireless networks is not like direct contact with the human body. It should be absolutely safe.

Simple method of formation

The basic equipment for setting up a wireless network is a wireless network card and an AP. In this way, the network resources can be shared in a wireless mode and with existing wired architectures. The installation costs and complex procedures are much lower than traditional wired networks. If it is only a peer-to-peer network of a few computers, you may not need an AP. You only need a wireless network card for each computer. The AP is an abbreviation for Access Point, which is generally translated as "wireless access node" or "bridge." It acts as a bridge between wireless workstations and wired local area networks in the media access control layer MAC. With an AP, just like a typical wired network Hub, wireless workstations can quickly and easily connect to the network. Especially for the use of broadband, WiFi has even more advantages. After the wired broadband network (ADSL, residential LAN, etc.) arrives at the home, it is connected to an AP, and then a wireless network card can be installed in the computer. Ordinary households have enough APs. Even after the user's neighbors are authorized, they do not need to add ports. They can also access the Internet in a shared manner.

Long-distance work

Do not look at the working distance of wireless WiFi is not large, in the case of complete network construction, the real working distance of 802.11b can reach more than 100 meters, and to solve the problem of error correction and error of data during high speed movement, WiFiI equipment and equipment The handover and security authentication between the device and the base station have all been well resolved.

All in all, the demand for mobile connectivity from home and small office network users is the driving force behind the growth of the wireless LAN market.

II: Comparison of WIFI with 3G and Bluetooth Technology

WIFI complements 3G

1. Voice and WLAN

Compared to 3G technologies that satisfy large-volume services and multiple users, WLAN networks based on IP technology are more suitable for conducting broadcast voice services (PTT, multi-party conferences, long-distance calls, advertisements, etc.).

2. Wide-area coverage and data coverage under regional coverage

Compared with the characteristics of large 3G technology coverage and the ability to maintain a data rate of 144 kbits at fast speeds, WIFI technology has an absolute advantage in satisfying users' needs for high-speed data transmission in specific areas.

3. Utilization of wireless channel resources

The frequency resources allocated by 3G are limited, and the occupancy rate of data services to the channel is extremely high, which affects the number of simultaneous voice users. If planning a specific area (such as a crowded area in a commercial center) to transfer data services to the public data channel of WiFi/WiMAX will undoubtedly greatly increase the utilization of 3G wireless network resources.

4. Handheld terminal and Laptop/PDA combination

The high data rate, Always0nLine, and low usage of the Laptop/PDA can meet the needs of business users with large amounts of information: Carrying a more convenient, compact 3G handheld terminal can meet the needs of individual users for fast messaging.

WIFI and Bluetooth technology

Bluetooth technology features:

Slow speed;

It is generally used to transmit small data and does not require a network.

Connect Bluetooth accessories;

Can't connect to the Internet and cannot access the Internet

Within 10 meters.

Wi-Fi technology features:

Can connect to the public network, providing web browsing capabilities;

high speed;

Send big data

Within 100 meters.

Three: WIFI in smart home applications

WiFi is a wireless network composed of APs (AccessPoints) and wireless network cards. APs are generally called network bridges or access points. They are bridges between traditional wired LANs and wireless local area networks. Therefore, any wireless network card is installed. The PC can share the resources of the wired local area network and even the wide area network through the AP. Its working principle is equivalent to a HUB or a route with a built-in wireless transmitter, and the wireless network card is a CLIENT terminal device for receiving signals transmitted by the AP.

Compared with the wired network mode adopted by traditional smart home systems, the application of WIFI technology reduces wiring troubles and has better scalability and mobility. Therefore, using wireless intelligent control mode is the inevitable choice for the development of smart home.

The following takes a company's digital wireless intelligent gateway as an example to illustrate the application of WIFI in smart homes. The application mainly includes a home gateway and several wireless communication sub-nodes. There is a wireless transmission module on the home gateway, and each sub-node is Both include a wireless network receiving module through which data is transmitted between the gateway and the child nodes.

The following figure shows the solution of the smart home system. The WIFI smart gateway is the indoor unit. The WIFI intelligent gateway is an intelligent hub of the home. Through the wireless RF module on the intelligent gateway, it communicates with each child node in the collection to realize the control of the home appliance. After the Web network controls the intelligent gateway, the remote control of the home appliance is realized.

WIFI smart gateway mainly includes the following applications:

A, digital video intercom

With the aim of introducing WIFI, the WIFI Smart Gateway can be used as a mobile terminal device, so you can conveniently conduct intercom control in the living room, bedroom and any place in your home.

B, security alarm

Once the police situation occurs, the alarm information will be uploaded to the management center in a timely manner. At the same time, the owners can also be notified via SMS, telephone, etc., and functions such as automatic capture can be achieved.

C. Information release

Through the community management software, the property manager can edit various information such as text, pictures, videos, weather, etc., and send the information to the smart gateway in the owner's home in real time. The owner can use the smart gateway prompt to browse various types of information on the central server. information.

D. Community Mall Management

Through the community management software to establish a virtual supermarket, the community owners can browse various commodity information through the smart gateway.

E, remote monitoring

Users use a computer network to remotely log in to the home gateway to achieve real-time monitoring of the home environment.

F, equipment self-test and remote maintenance

The above functions all use the WIFI technology to realize the control function of the wireless smart home.

In short, through the use of WIFI technology, various smart home devices and building intercoms have been successfully linked to provide a more comfortable, safe and convenient smart home living space than traditional smart homes, optimizing people’s lifestyles. Bring new and comfortable home life to users.