ARFCN
The ARFCN ( A m pletely R adio F requency C hannel N umber) is a concept of the GSM -Mobilfunks. The uplink and downlink frequencies of a channel pair can be calculated from the ARFCN . In UMTS or. LTE network, the ARFCN is being replaced by the UARFCN ( UTRA Absolute Radio Frequency Channel Number ) or EARFCN ( E-UTRA Absolute Radio Frequency Channel Number ).
Calculation equations
Using this general formula, the carrier frequencies for the uplink and downlink direction can be calculated for the GSM bands with fixed ARFCNs, depending on the ARFCN and the frequency band used:
According to this general formula, the ARFCN for the GSM bands with fixed ARFCNs can be calculated from the carrier frequency of the uplink and downlink direction :
where the channel spacing is 200 kHz.
Surname | ARFCNs | Starting frequency |
Offset | distance | Uplink frequencies |
Downlink frequencies |
---|---|---|---|---|---|---|
GSM 450 | 259-293 | 450.6 MHz | 259 | 10 MHz | 450.6 - 457.4 MHz | 460.6-467.4 MHz |
GSM 480 | 306-340 | 479.0 MHz | 306 | 10 MHz | 479.0-485.8 MHz | 489.0 - 495.8 MHz |
GSM 850 | 128-251 | 824.2 MHz | 128 | 45 MHz | 824.2 - 848.8 MHz | 869.2 - 893.8 MHz |
P-GSM | 1 - 124 | 890.0 MHz | 0 | 45 MHz | 890.2 - 914.8 MHz | 935.2-959.8 MHz |
E-GSM | 0 - 124 | 890.0 MHz | 0 | 45 MHz | 890.0 - 914.8 MHz | 935.0-959.8 MHz |
... | 975-1023 | 890.0 MHz | 1024 | 45 MHz | 880.2 - 889.8 MHz | 925.2 - 934.8 MHz |
R-GSM | 0 - 124 | 890.0 MHz | 0 | 45 MHz | 890.0 - 914.8 MHz | 935.0-959.8 MHz |
... | 955-1023 | 890.0 MHz | 1024 | 45 MHz | 876.2 - 889.8 MHz | 921.2 - 934.8 MHz |
DCS 1800 | 512-885 | 1710.2 MHz | 512 | 95 MHz | 1710.2-1784.8 MHz | 1805.2-1879.8 MHz |
PCS 1900 | 512-810 | 1850.2 MHz | 512 | 80 MHz | 1850.2-1909.8 MHz | 1930.2-1989.8 MHz |
Example: E-GSM
In the E-GSM band, ARFCNs can occur in the range 0 to 124 and 975 to 1023. The calculation for the uplink frequency of the ARFCN 42 is:
The downlink frequency follows from this:
The calculation for ARFCN 1001 is analogous:
The downlink frequency follows from this
The calculation of the ARFCN from the uplink frequency is:
See also
Web links
- ARFCN to Frequency Calculator / Table ( Memento from December 17, 2009 in the Internet Archive )
- GSM spectrum (Austria)