The UTRA Absolute Radio Frequency Channel Number (UARFCN) is a unique number given to each radio channel within the frequency bands used by the UMTS UTRA. The UARFCN can be used to calculate the carrier frequency.

The UARFCN is defined as follows:

NU = 5 * (FUL - FUL_Offset), with FUL_low ≤ FUL ≤ FUL_high

ND = 5 * (FDL - FDL_Offset), with FDL_low ≤ FDL ≤ FDL_high

NU and ND are the UARFCN for the uplink and the downlink.

For each operating band, FUL_Offset, FUL_low, FUL_high, FDL_Offset, FDL_low and FDL_high are defined in 3GPP TS 25 101.

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