ENGLISH: Summary

Bacics of Wireless Network

            The firs commercially available radio and telephone system, know as the Improved Mobile Telephone Service (IMTS) was put into service in 1946. It a tall transmitter tower was erected near the center of a metropolitan area. Several assigned channels were then transmitted and received from the antenna atop this tower and any vehicle within range. The solution to this problem, metropolitan areas were divided into cells of no more than a few miles in diameter and set of drequencies. The power of the transmitter was kept at a level just high enough to serve cell. In conjunction with sophisticated electronic equipment at the cell sites or Base Stations (BS) and the telephone switching of fices or Mobile Switching Centers (MSCs) are transferred from one frequency set to another with no audible pause.

            The initial transmission technonogy used between vehicle and the cell was analoginature and know as Advance Mobile Phone System (AMPS), the analog schema used Frequency – Division Multiple Access (FDMA), Digital Transmission was later developed, resulting in Time Division Multiple Access (TDMA) esed in US, and Group Special Mobile (GSM) used in Europe.

            The continuing growth of celluler communications led government and industry in the US to search for additional ways to satisfy the obvious need to only for ordinary telephone service but also for special service and features, smaller telephones and cellular phone. This search led to the development of the Personal Communications Service (PCS) industry. The Federal Communication Commission (FCC) auctioned them off through a sophisticated bidding contest that brought the US treasury billions of dollars. But, many of the new potention operators went bankrupt and never actually had a cance to ise it. The decision was based on a beauty contest, a comparison of business case, technology, and future plansn rather than the bidding process in Canada.