User guide

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10 NB-IOT devices
10.1 Stand alone cell
When using standalone NB-IOT cell, only dl earfcn has to be set in ue.cfg file. The ul earfcn is
automatically deduced
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Note : If Uplink Downlink spacing doesn’t follow standard values, ul earfcn must be set as well
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10.2 Guard band and in band cell
In in-band and guard band modes, RB used for NB-IOT in uplink and downlink are configured
by the network. Uplink EARFCN and frequency offset values used are broadcasted via SIB2.
UE SIM can not change dynamically the UL Freq based on SIB2 parameters. It’s then required
to set those values (ul_earfcn and ul_carrier_freq_offset) manually in the ue.cfg file
Example of SIB2 message:
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Note : If Amarisoft eNodeB is used, command cell can be used to display dl_earfcn
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Example of ue.cfg file:
bandwidth: 1.4,
multi_ue: true,
multi_ue_type: "nbiot",
rel13_5: true,
cells: [
{
dl_earfcn: 6309, /* 806 MHz (Band 20) */
n_antenna_dl: 1, /* number of downlink antennas */
n_antenna_ul: 1,
ul_earfcn: 24318,
ul_carrier_freq_offset: 0,
}