NCC is part of BSIC. MS uses it to
distinguish adjacent BTS that belong to different GSM PLMN. NCC is composed of 3 bits, with coding capacity of 8.
NCC and BCC
together constitute BTS identity code (BSIC), transmitted on synchronous
channel of each cell.
In many cases,
different GSM PLMN employs the same frequency resource. But their network
planning are independent from each other. To ensure that adjacent BTS with same
frequency have different BSIC, it is generally regulated that adjacent GSM PLMN
select different NCC.
Adjacent or
close cells with the same BCCH frequency must have different BSIC. Special
attention should be paid to the configuration of cells in boundary areas.
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