Base Station Identity Code or BSIC

Base Station Identity Code (BSIC)

BSIC allows a mobile station to distinguish between different neighboring base stations.
BSIC = NCC + BCC
NCC = Network Colour Code (3 bits), identifies the GSM PLMN.
Note that it does not uniquely identify the operator. NCC is primarily used to distinguish between operators on each side of border.
BCC = Base Station Colour Code (3 bits), identifies the Base Station to help distinguish between BTS using the same BCCH frequencies