GSM: Base Station Subsystem (BSS)
Base Station Subsystem (BSS)
The BSS connects the Mobile Station and the NSS. It is in charge of the transmission and reception. The BSS can be divided into two parts:
· The Base Station Controller (BSC).
· The Base Transceiver Station (BTS) or Base Station.
Base Station Controller (BSC)
The central network element of BSS and it controls the radio network. The main responsibilities of BSC are connection establishment between Mobile subscriber and network switching subsystem.
The BSC controls a group of BTS and manages their radio resources. A BSC is principally in charge of handovers, frequency hopping, exchange functions and control of the radio frequency power levels of the BTSs.
Base Transceiver Station (BTS)
The BTS corresponds to the transceivers and antennas used in each cell of the network. A BTS is usually placed in the center of a cell. Its transmitting power defines the size of a cell. Each BTS has between one and sixteen transceivers depending on the density of users in the cell.
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