High Tech Internet
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Wireless Internet
Wireless Internet Service | Cellular Internet | HotSpot wireless Internet | Satellite internet from anywhere
One of most exciting new technologies today is
Wireless Internet Service. Wireless technology is playing an increasing role in
the lives of people around the world. Many people use Internet services from
cell phones, PDAs, Pocket PCs, or
laptops. This became the convenient and fast way to communicate in each
occupation: from doctors and policemen to salespeople and businessmen. They use the Wide World Web everyday at offices, at home and on the move,
and can not work and live normally without it.
Wireless technology uses as a medium of communication the radio waves, that operate in the 3 KHz to 300 GHz range. For comparison, the AM radio band operate in 1 MHz diapason, the FM radio band operate in diapason of 100 MHz , and the GPS (Global Positioning Satellite) band operates in the diapason 1.5 GHz.
Today, 3rd Generation Wireless, or 3G, is the term used for the next generation of wireless or mobile communications systems. 3G systems aim to provide enhanced voice, text and data services to each user. The third generation networks supports real-time video, high-speed multimedia and mobile Internet access. There is also coming soon a cellular standard should be called as 4G. The fourth generation being championed in Japan will boost the data rates to 20 Mbps. These speeds enable high quality video transmission and rapid download of large music files. The first 4G phones may appear as soon as 2006.
Below we describe some variety of technologies of modern Wireless Internet mentioning main corresponding Connection standards or protocols.
Cellular Internet
Cellular Internet services is based on a cellular architecture that consists of a backbone network with fixed base stations interconnected through a the wired public switched telephone network (PSTN). The geographic area within mobile units (cellphones) can communicate with a particular base station is called a cell. Adjacent cells overlap with each other, thus ensuring continuity of communications when the users move from a territory of one cell to another cell. The users mobile units communicate with each other, as well as with other networks, through the base stations and the backbone network. A set of channels ( radio frequencies) is allocated to each base station. Neighboring cells have to use different channels in order to avoid intolerable interferences. Developed according to the 3rd Generation Partnership Project (3GPP), the Global System for Mobile TeleCommunications (GSM) is the most popular standard for mobile phones in the world. This Project is a co-operation between ETSI (Europe), ARIB/TTC (Japan), CCSA (China), ATIS (North America) and TTA (South Korea). The based on this project standards make it possible to use the same phones with different companies' services, or even roam into different countries. For these standards both signaling and speech channels are digital. General Packet Radio Service (GPRS) is a mobile data service available to users of GSM mobile phones. It is often described as "2.5G", that is, a technology between the second (2G) and third (3G) generations of mobile telephony. GPRS was invented with the idea that cell phones can also be computers, e-mail and Web browsers and even TV receivers. 3G based on two main standards—W-CDMA (Wideband Code Division Multiple Access) and CDMA2000 (Code Division Multiple Access -2000).
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