ABSTRACT
The cellular concept was invented by Bell Laboratories and the first commercial analog voice system was introduced in Chicago in October 1983. The first generation analog cordless phone and cellular systems became popular using the design based on a standard known as Advanced Mobile Phone Services. The area served by mobile phone systems is divided into small areas known as cells. Each cell contains a base station that communicates with mobiles in the cell by transmitting and receiving signals on radio links. A base station communicates with mobiles using two types of radio channels, control channels to carry control information and traffic channels to carry messages. Each base station continuously transmits control information on its control channels. A mobile tuned to a control channel detects its number in the paging message and responds by sending a response signal to the nearby base station.
