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Reply To: Inteference


GSM is based on FDMA : the frequency band is divided into channels of 200kHz each, with channels in downlink and channels in uplink.

A pair of channels UL+DL is represented by a number “ARFCN”. In GSM900 there are 124 channels, from ARFCN=1 to ARFCN=124.

ARFCN=1 correponds to UL=890.2 MHz and DL=935.2 MHz.

When a MS setups a call, it is allocated on one timeslot of one ARFCN (in case of NO HOPPING). The allocation is usually decided by the BSC, which chooses which ARFCN and which timeslot.