Mobile switching center (MSC)
A wireless network is divided geographically into a number of cells, each defined by a radio frequency (RF) radiation pattern from a respective base transceiver station (BTS) antenna. The BSC may be coupled to a mobile switching center (MSC) and a packet data serving node (PDSN). In typical circuit-switched wireless communication systems, the mobile switching center (MSC) connects the landline public switched telephone network (PSTN) system to the wireless communication system. The mobile switching center is typically split into a mobile switching center server and a media gateway, and incorporates the bearer independent call control (BICC). A mobile switching center includes a first database for storing location information and the call details of a mobile terminal. The MSC is also connected to a second database in which information about a subscriber registered in its mobile communication service is stored. The base stations route the communications to the MSC via a serving BSC. The MSC routes the communications to another subscribing wireless unit via a BSC/base station path or via the PSTN/Internet/other network to terminating destination. Between MSCs, circuit connections provide the handover mechanism that service calls as users roam from one service zone to another.
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