UTRAN Cell Identity returned by getCid()

Question

In UMTS I get a large number returned by getCid() (larger than the allowed value). Is this the UTRAN Cell Identity (UC-ID)?

UC-Id = RNC-Id + C-Id
         


        

Answer 1

If CID is > 65536, it's not actually the cell-ID, but a linear combination of the real cell-ID and RNC-ID:

UTRAN_CELL_ID = RNCID x 65536 + CellID

To extract the cellID, use the modulo operation:

CellID = UTRAN_CELL_ID % 65536

To extract the RNCID, get the integer part:

RNCID = UTRAN_CELL_ID / 65536