In the following explanation, a cellular telephone or any other device that can connect to a cellular radio network will be referred to as a mobile station. This is in keeping with the literature on the subject.
A cellular network consists of both land and radio based sections. Such a network is commonly referred to as a PLMN - public land mobile network. The network is composed of the following entities:
- Mobile station (MS): A device used to communicate over the cellular network.
- Base station transceiver (BST): A transmitter/receiver used to transmit/receive signals over the radio interface section of the network.
- Mobile switching center (MSC): The heart of the network which sets up and maintains calls made over the network.
- Base station controller (BSC): Controls communication between a group of BSTs and a single MSC.
- Public switched telephone network (PSTN): The land based section of the network.
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