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The LTE standards have very little to say about the actual frequencies used for the LTE carriers. However in practice it is necessary to restrict the locations of the carrier centres to standardisation purposes.

It is assumed that within each supported band, LTE carriers exist on a 100kHz raster or grid.. In this way the frequency of the carrier frequency, i.e. the centre frequency of the radio channel can be expressed as m . 100 kHz, where is an integer.

To provide a means of identifying the different channels available a schme known as the EARFCN has been adopted.

LTE EARFCN

LTE EARFCN stands for E-UTRA Absolute Radio Frequency Channel Number. EARFCN number is within range 0 to 65535 .

${F}_{\mathrm{downlink}}={\mathrm{FDL}}_{\mathrm{Low}}+0.1\left(\mathrm{NDL}-{\mathrm{NDL}}_{\mathrm{Offset}}\right)$

${F}_{\mathrm{uplink}}={\mathrm{FUL}}_{\mathrm{Low}}+0.1\left(\mathrm{NUL}-{\mathrm{NUL}}_{\mathrm{Offset}}\right)$

Where:
NDLoffset = offset used to calculate downlink EARFCN
NULoffset = offset used to calculate uplink EARFCN

LTE EARFCN channel / band chart

To provide a view of the EARFCN channel calculations, the table below provides a good indication of the ranges for many of the LTE frequency bands.

It can be seen that the downlink EARFCN starts at 0 and the Uplink starts at 18000.

EARFCN Chanel Numbers for Channels 1 - 14
(NUL)
1211000-59919201800018000-
18599
21930600600-119918501860018600-
19199
3180512001200-194917101920019200-
19949
4211019501950-239917101995019950-
20399
586924002400-26498242040020400-
20649
687526502650-27498302065020650-
20749
7262027502750-344925002075020750-
21449
892534503450-37998802145021450-
21799
91844.938003800-41491749.92180021800-
22149
10211041504150-474917102215022150-
22749
111475.947504750-49991427.92275022750-
22999
1272850005000-51796982300023000-
23179
1374651805180-52797772318023180-
23279
1475852805280-53797882328023280-
23379

The table above provides a good indication of the EARFCN channel numbers for several LTE bands and provides a useful indication of the ranges of channel numbers.

Wireless & Wired Connectivity Topics:
Mobile Communications basics2G GSM3G UMTS4G LTE5GWiFiIEEE 802.15.4DECT cordless phonesNFC- Near Field CommunicationNetworking fundamentalsWhat is the CloudEthernetSerial dataUSBSigFoxLoRaVoIPSDNNFVSD-WAN

Watch the video: - TDD vs FDD in 4G LTE (July 2022).

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