The wireless industry has grown over the years at an exponential rate to keep pace with the rapidly increasing demand for information at our fingertips. Wireless relates to a communications, monitoring or control system in which electromagnetic waves carry a signal through atmospheric space rather than along a wire. Most wireless systems use radio frequency or infrared waves. RF or radio frequency includes any of the electromagnetic wave frequencies that lie in the range extending from 3 kHz to about 300 GHz which include the frequencies used for radio and television transmission. Infrared Waves (IR) includes frequencies from 3 THz to 430 THz (Ahmadi, 2010). Mobile communications was mainly applied to military and public safety services until the end of World War II, but after the war it began to be applied to public telephone services. The first public mobile phone service was the Mobile Telephone System or MTS which was introduced in the United States in 1946. In this system, operation was simplex and call placement was handled by a manual operation. The MTS was then followed by the development of a full duplex automatic switching system, the improved mobile telephone system or IMTS (Haag, 2010). The IMTS was first introduced in 1969 using a 450 MHz band. Although it was widely known in the US as a standard mobile phone system, it was not able to cope with rapidly increasing demand for two reasons: it was a large-zone system and its assigned bandwidth was not enough. A more advanced and high-capacity land mobile communication system called Advanced Mobile phone service or AMPS was then introduced in the United States in 1983 here in Chicago. One of the features of AMPS is that it is able to employ a cellular concept to achieve a high capacity.

Within a cellular network, a mobile communications network which is a series of overlapping hexagonal cells in