Hi, Nguyen! BSIC consists of two 3-bit coded parts: NCC and BCC. NCC stands for Network color code, BCC – base station color code. BSIC planning is a part of RF planning. BSIC decoding helps mobile to distinguish between two cells if they use the same frequency channel. NCC part must be always in line with the parameter PLMN_permitted which is broadcast on BCCH. It means that NCC value must be in the PLMN_PERMITTED list otherwise mobile will not be able neither to camp on cell nor make a handover.