UTRA Absolute Radio Frequency Channel Number

The uarfcn shortly UARFCN is an integer from the transmission frequency of a UMTS - carrier is calculated. UTRA is the abbreviation for UMTS Terrestrial Radio Access.

The main difference to the ARFCN in GSM is that within the UTRAN, even within the individual bands, no fixed duplex spacing is prescribed and therefore different UARFCN are used for the uplink and downlink direction. The EARFCN ( E-UTRA Absolute Radio Frequency Channel Number ) is used in LTE networks .

Only the UARFCN is used within the UMTS cellular network. The conversion into a transmission or reception frequency only takes place in the end device or the base station ( NodeB ).

Calculation equations

It applies   and   ${\displaystyle f_{\mathit {UplinkLow}}\leq f_{Uplink}\leq f_{\mathit {UplinkHigh}}}$ ${\displaystyle f_{\mathit {DownlinkLow}}\leq f_{\mathit {Downlink}}\leq f_{\mathit {DownlinkHigh}}}$

The UARFCN is then calculated as follows:

${\displaystyle {\mathit {UARFCN}}_{\mathit {Uplink}}=5\cdot (f_{\mathit {Uplink}}-f_{\mathit {OffsetUp}})}$

${\displaystyle {\mathit {UARFCN}}_{\mathit {Downlink}}=5\cdot (f_{\mathit {Downlink}}-f_{\mathit {OffsetDown}})}$

Since the step size of the channels in UMTS is 200 kHz, the factor 5 was chosen so that the UARFCN results in a whole number.

The uplink and downlink frequency are calculated from the UARFCN as follows:

${\displaystyle f_{\mathit {Uplink}}={\frac {{\mathit {UARFCN}}_{\mathit {Uplink}}}{5}}+f_{\mathit {OffsetUp}}}$

${\displaystyle f_{\mathit {Downlink}}={\frac {{\mathit {UARFCN}}_{\mathit {Downlink}}}{5}}+f_{\mathit {OffsetDown}}}$

The values ​​in this table apply to the parameters in the individual bands:

tape	f OffsetUp	f UplinkLow	f UplinkHigh	f OffsetDown	f DownlinkLow	f DownlinkHigh	ARFCN uplink	ARFCN downlink
I.	0	1922.4	1977.6	0	2112.4	2167.6	9612-9888	10562-10838
II	0	1852.4	1907.6	0	1932.4	1987.6	9262-9538	9662-9938
III	1525	1712.4	1782.6	1575	1807.4	1877.6	937-1288	1162-1513
IV	1450	1712.4	1752.6	1805	2112.4	2152.6	1312-1513	1537-1738
V	0	826.4	846.6	0	871.4	891.6	4132-4233	4357-4458
VI	0	832.4	837.6	0	877.4	882.6	4162-4188	4387-4413
VII	2100	2502.4	2567.6	2175	2622.4	2687.6	2012-2338	2237-2563
VIII	340	882.4	912.6	340	927.4	957.6	2712-2863	2937-3088
IX	0	1752.4	1782.4	0	1847.4	1877.4	8762-8912	9237-9387
X	1135	1712.4	1767.6	1490	2112.4	2167.6	2887-3163	3112-3388
XI	733	1430.4	1450.4	736	1478.4	1498.4	3487-3587	3712-3812
XII	−22	700.4	713.6	−37	730.4	743.6	3612-3678	3837-3903
XIII	21st	779.4	784.6	−55	748.4	753.6	3792-3818	4017-4043
XIV	12	790.4	795.6	−63	760.4	765.6	3892-3918	4117-4143
XIX	770	832.4	842.6	735	877.4	887.6	312-363	712-763

In Germany, Band I is used in FDD mode.

See also

• UMTS Terrestrial Radio Access Network (UTRAN)
• Transmission frequency

Web links

• Article "UMTS frequency allocation in Austria" on umtslink.at (last accessed on December 13, 2009)

Individual evidence

1. ↑ 3GPP TS 25.104: Base Station (BS) radio transmission and reception (FDD); Cape. 5.4.3 Channel number ( English , ZIP / DOC; 505 KB) September 30, 2009. Accessed December 13, 2009.
2. ↑ 3GPP TS 25.104: Base Station (BS) radio transmission and reception (FDD); Cape. 5.3: Tx-Rx frequency separation ( English , ZIP / DOC; 505 KB) September 30, 2009. Accessed on December 13, 2009: "The use of other transmit to receive frequency separations in existing or other frequency bands shall not be precluded"