What Is a Wireless Handset?

WiFi is more and more widely used on handheld devices, and smart phones are one of them. Different from the Bluetooth technology applied to mobile phones earlier, WiFi has larger coverage and higher transmission rate, so WiFi mobile phones have become a fashion trend in the mobile communication industry. Because the frequency band of WiFi is a free frequency band that does not require any telecommunications operating license worldwide, WLAN wireless devices provide a wireless air interface that can be used worldwide with extremely low cost and high data bandwidth.

wifi phone

Users can quickly browse the web in the WiFi coverage area and answer and make calls anytime, anywhere. And some other WLAN-based broadband data applications, such as streaming media, online games and other functions are worth the user's expectations. With the WIFI function, we can make long-distance calls (including international long-distance calls), browse the web, send and receive emails, download music, and transfer digital photos. There is no need to worry about slow speed and high cost. The full name of WiFi is Wireless Fidelity, also known as the 802.11b standard. Its biggest advantage is its high transmission speed, which can reach 11Mbps. In addition, its effective distance is very long, and it is compatible with various existing 802.11 DSSS equipment. With the notebook chipset proposed by Intel Corporation-"Centrino" being recognized by more and more people, this technology has gradually become a topic of concern. However, since the end of 2005, many mobile phone manufacturers, especially brands that mainly produce smart phones, have begun to introduce WiFi into their products. Many mobile phones have built-in WiFi, but

WiFi is more and more widely used on handheld devices, and smart WiFi phones are one of them. Users can quickly browse the web in the WiFi coverage area and answer and make calls anytime, anywhere. And some other WLAN-based broadband data applications, such as streaming media, online games and other functions are worth the user's expectations. With the WIFI function, we can make long-distance calls (including international long-distance calls), browse the web, send and receive emails, download music, and transfer digital photos. There is no need to worry about slow speed and high cost. The full name of WiFi is Wireless Fidelity, also known as the 802.11b standard. Its biggest advantage is its high transmission speed, which can reach 11Mbps, and its effective distance is also very long.

Although a single-mode WiFi phone has only one call mode, it has attracted much attention from enterprises and groups for its own characteristics. Its main features are:

(1): clear call and timeliness;

(2): Because the cost of the call is lower through the network session;

(3): strong flexibility, can call anywhere in the group;

(4): No wiring required

(5): Simple equipment

Wi-Fi, like Bluetooth, is a short-range wireless technology used in offices and homes. Wi-Fi hotspots were born in 2002. In the United States, Wi-Fi is like the early Internet, showing a spark of ignorance. It is a short-range wireless transmission technology capable of supporting radio signals for Internet access over hundreds of feet. With the development of technology and the emergence of standards such as IEEE 802.11a and IEEE 802.11g, the IEEE 802.11 standard has been collectively called Wi-Fi. From the application level, to use Wi-Fi, users must first have a Wi-Fi compatible user device.

Wi-Fi is an enabling technology that helps users access email, Web and streaming media. It provides users with wireless broadband Internet access. At the same time, it is also a fast and convenient way to surf the Internet at home, office, or on the go. Places that can access Wi-Fi networks are called hotspots. Wi-Fi or 802.11b works in the 2.4Ghz band and supports a maximum speed of up to 11Mbps. There are two other protocols in the 802.11 space, including a and g. They are also publicly used, but 802.11b is the most commonly used in the world.

Wi-Fi hotspots are created by installing an access point on an internet connection. This access point transmits wireless signals over short distances, typically covering 300 feet. When a Wi-Fi-enabled device (such as a Pocket PC) encounters a hotspot, the device can connect to that network wirelessly. Most of the hotspots are located in publicly accessible places, such as airports, coffee shops, hotels, bookstores, campuses, and so on. Many homes and offices also have Wi-Fi networks. Although some hotspots are free, most stable public Wi-Fi networks are provided by private Internet service providers (ISPs), so users will be charged a fee when they connect to the Internet.

It is also compatible with various 802.11 DSSS devices already in the world. Centrino technology for notebook computers is based on this standard.

Wi-Fi technology complements high-speed wired access technology. Wired access technologies include Ethernet, XDSL, etc. Wi-Fi access has the advantages of mobility and low price. Wi-Fi technology is widely used in areas where wired access requires wireless extension, such as temporary venues. Due to differences in data rates, coverage, and reliability, Wi-Fi technology will complement high-speed wired access technology in broadband applications. The key technologies undoubtedly determine the strength of Wi-Fi. OFDM, MIMO, smart antennas, and software wireless are all beginning to be applied to wireless LANs to improve Wi-Fi performance. For example, 802.11n plans to use MIMO and OFDM to increase the data rate. In addition, the improvement of antenna transmission technology has greatly increased the transmission distance of wireless local area, which can reach several kilometers.

Secondary positioning of WI-FI technology

As a new wireless transmission and communication technology, Wi-Fi has the following outstanding technical advantages:

First, the coverage of radio waves is wide. The coverage of radio waves based on Bluetooth technology is very small. The radius is only about 50 feet, which is about 15 meters, and the radius of Wi-Fi is about 300 feet, which is about 100 meters. Therefore, Wi-Fi has always been an important technology for enterprises to realize their wireless LAN.

Second, although the wireless communication quality transmitted by Wi-Fi technology is not very good, the data security is worse than Bluetooth, and the transmission quality needs to be improved, but the transmission speed is very fast, which can reach 54Mbps, which meets the needs of personal and social information .

Third, the threshold for manufacturers to enter this field is relatively low. Manufacturers do not need to spend money to access network cabling, which saves a lot of costs. Compared to expensive 3G enterprise networks, Wi-Fi is better.

Wi-Fi speeds are also different. Among them, IEEE802.11b is up to 11Mbps, (some manufacturers can reach 22Mbps if the equipment is matched), IEEE802.11a is 54Mbps, and IEEE802.11g is also 54Mbps.

Market analysis

The commercialization of Wi-Fi on a large scale has rarely seen successful precedents worldwide. The problem is concentrated in two aspects: first, the large operators' disapproval of this model; second, the lack of an effective business model itself. But wireless LANs based on Wi-Fi technology have become increasingly popular. This will mean that it can be used very conveniently in the future. Once there is a public place of Wi-Fi network, the problems of interconnection and interoperability, high charges and roaming of operators are solved. Wi-Fi will transform from a successful technology to a successful business in the future. Many operators have been involved in this field, and governments and cities in many countries use this technology to create wireless cities and countries. And with the popularity of digital entertainment equipment, Wi-Fi has become the second most popular player. According to information provided by manufacturers such as d-link, sales of wireless routers have increased by 100% over the past year.

For public wireless local area networks, in Europe, only BT announced that it has built more than 500,000 hotspots across the UK, continued to develop the WI-FI market in the United States, and deployed 25,000 new Wi-Fi hotspots through most of Europe and China. , Intending to provide those business pioneers, remote workers and mobile users with more convenient and wider WIFI access, so that the total number of ATT Wi-Fi hotspots in the world will reach 125,000

There are many mobile phone models that support WIFI, which can be roughly divided into two categories: GSM + WIFI mode (referred to as dual mode), and single WIFI mode (referred to as single mode). The development of dual-mode mobile phones is early, and has been supported by many large manufacturers, and has been widely used in the consumer field; single-mode mobile phones have gradually been tried by some manufacturers since 2000, but due to chip and other restrictions, it was only after 2007. Gradually there are applications, mainly in the form of industrial communication terminals.

In the dual-mode field, apart from mainland China, there are a wide range of applications around the world. Nokia, Motorola, HTC, Apple, and many other models have WIFI functions. Applications are mainly focused on data transmission and video. In terms of voice calls, some Yes, some don't. In China, manufacturers involved in dual-mode mobile phones, except Huawei, are small and medium-sized enterprises with limited strength.

In the field of single-mode, before 2006, there were many well-known manufacturers, such as Hitachi, etc., but because of market capacity and no good match point, they have given up or transformed. With the popularization of wireless networks, the single-mode WIFi mobile phone market has gradually improved since 2008, but due to early reasons, large manufacturers worldwide have not participated. Many companies are still in the early stages of research and development, but with the passage of time and technology updates, it is expected that more companies and more products will appear within two years. In the field of single-mode WIFI mobile phones, many domestic companies will grow rapidly and become the benchmark and standard to guide the industry's progress worldwide.