1XEV-DO Architecture For Wireless Internet
Published on Sep 21, 2019
Millions of people around the world use the Internet every day -- to communicate with others, follow the stock market, keep up with the news, check the weather, shop, entertain themselves and also to learn.
Staying connected has become so important that it's hard to get away from our computer and our Internet connection because we might miss an e-mail message or any news we need to know. With the world's business and people's personal lives growing more dependent on communication over the Internet, we must be ready to take the next step and get a device that allows us to access the Internet on the go.
That's where Wireless Internet comes in. This revolution has coincided with the cellular boom in the last few years. The expanding network of digital cellular and personal communication services (PCS) has created a solid foundation for wireless Internet services.
How do the WAP enabled devices work?
The following is the process that occurs when we access a website through a WAP enabled device.
" The device is turned ON, and a mini-browser is opened.
" The device sends out a radio signal, searching for a service.
" A connection is made with the service provider.
" A Website is selected for viewing.
" A request is sent to the gateway server using WAP.
" The gateway server retrieves the information via HTTP from the Web site.
" The gateway server encodes the HTTP data as WML.
" The WML-encoded data is sent to the device.
" We can see the wireless Internet version of the Web page we had selected
1xEV-DO, officially known as IS-856, is a recent addition to the architecture for the air interface standard for wireless internet and is specifically designed for packet data and offers bandwidth efficiency for data traffic which is 3-4 times greater than current 3G standards such as W-CDMA.1xEV-DO achieves a peak data rate of 2.45 Mbps on the forward link (from the Base Station, BTS, to the user) using only 1.25 MHz of spectrum.
The technology is ideal for high-speed Mobile as well as Fixed Wireless Internet services. A well-engineered 1xEV-DO network delivers average download data rates between 600K and 1,200K bit/sec during off-peak hours and between 150K and 300K bit/sec during peak hours. It is compatible with any computer operating system that supports IP. It is completely compatible with all versions of Microsoft's operating systems (Windows 95/98/2000/NT/XP), Pocket PC, Macintosh Systems, UNIX, LINUX, and any other OS's supporting the Internet protocol.
1xEV-DO takes advantage of recent advances in mobile wireless communications, such as the adaptive modulation system, which lets radio nodes optimize their transmission rates based on instantaneous channel feedback received from terminals. This, coupled with advanced multilevel modulation, lets 1xEV-DO achieve download speeds that are near the theoretical limits of the mobile wireless channel! The User may use his device and applications just as he would in a wire-line environment.