A basic cellular system has several mobile stations, base stations and mobile switching centers. The mobile switching center is sometimes called as mobile telephone switching office, since it is responsible for connecting all the mobile phones to the PSTN in a cellular system. Each mobile communicates with the help of a radio with one of the base stations and may be handed off to any number of base stations throughout the duration of a call. The mobile station contains a transceiver, an antenna, and control circuitry, and may be mounted on a vehicle or used as a portable hand held unit. The base station consists of several transmitters and receivers which simultaneously handle full duplex communications and generally have towers which support several transmitting and receiving antennas. The base station serves as a bridge between all the mobile users in the cell and connects the simultaneous mobile calls via telephone lines or microwave links to MSC. The MSC coordinates the activities of all the base stations and connects the entire cellular system to PSTN.
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