BASIC OF WIRELESS NETWORKS

Sumarry

BASIC OF WIRELESS NETWORKS

The first comercially available radio and telephone system, known as the improved Mobile Telephone Service (IMTS), was put into service in 1946. In order to us IMTS, a tall transmitter tower  was erected near the center of a metropolitan area. Several assigent channels were then transmitted and received from the antenna atop this tower and any vechile within range could attempt to seize one of those channels and complete a call. Given this constructions, the number of channels available did not come close to satisfying the demand.

Two important characteristics of cellular systems contribute to their usefulness. The first is their controlled handoff. As subscribers are diving out of one cell and into another, their mobile ( subscribers) units, in conjuction with sophisticated electronic equipment at the cells sites [also known as base stations (BS)] and the telephone switching offices [ also known as mobileswitching centers, (MSCS)], are transferred from one frequency set to another with no audible pause. Second, system were designed to locate particular subsrcibers by paging them in each of the cells. After locating the vechile in which the United States, called Group Speciale Mobile (GSM), now known as Global system for Mobile Communications.

Abstrak

Unfortunately, after acquiring the spectrum, many of the new potential operators went bankrupt and never actually had a chance to use it. In Canada, the decision was based on a beauty contest, a comparisonof business cases, technology, and future plants, rather than the bidding process.