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| GSM architecture : Base Station Subsystem (BSS) |
Several BTSs are controlled by the Base Station Controller, or BSC.
This assigns free radio channels in the TRX for the link to the mobile station. It controls the
necessary output power for mobile station and TRX. It monitors the existing radio link to and
from the mobile station and controls handover between neighboring radio cells if they are
under its control. During an existing radio connection, the BSC monitors its quality and
controls disconnection of the radio link when the call is over. The BSC communicates with
the transcoder (TC) via the A-ter interface.
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