Base Station Controller (BSC) is located between BTS and Mobile service switching centre (MSC). BSC provides the control function between both BTS and MSC. Beside handover function, BSC provides cell configuration data and control of radio frequency (RF) power level in BTS. When the data sessions from mobile broadband services and others service comes to BTS than BSC will allocate Radio resource to this session before they reach the application layer which located on the core network or out side (internet)

BSC is acted as a concentrator where many different low capacity connections to BTS with various traffic and services become reduced to a smaller number of connections to MSC. It means the session from mobile telecommunication subscriber which land on many BTS will be concentrated on BSC and than deliver it to MSC with a high level of utilization. You can imagine what happen if each of BTS with low level of utilization will connect to MSC directly. There will be many connections from BTS to MSC but has low traffic. This is not good telecommunication architectures and high cost. BSC is a bridge between both

Since the function is very critical on the telecommunication infrastructures either GPRS or CDMA, BSC should be installed be fully redundancy. The redundancy includes dual power supply, database etc. This redundancy will guarantee that the service will be not interrupted while the primary BSC is going down

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