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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 stands for E-UTRA Absolute Radio Frequency Channel Number. EARFCN number is within range 0 to 65535 .
NDL = downlink EARFCN
NUL = uplink EARFCN
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|
|E-UTRA band||FDL_Low (MHz)||NDL_Offset||downlink EARFCN(NDL)||FUL_Low(MHz)||NUL_Offset||uplink EARFCN|
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.
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