The set command sets the extra maximum TX power reduction.
The command can be given separately to the Narrowband Internet of Things (NB-IoT) and
LTE-M modes. If a band is not mentioned in the command, the
EMPR is zero for that band. The command cannot be used to increase transmission power.
%XEMPR should be given before the activation of the modem to be
effective. The command configuration is stored to Non-volatile Memory (NVM) approximately every 48 hours and when the modem is powered off with the
+CFUN=0
command. The configuration can be stored to NVM with the %XFSSYNC
command when the Production Test Image (PTI) modem firmware is
used. If a valid EMPR configuration exists,
the reduction is automatically applied to the applicable transmissions.
Syntax:
%XEMPR=<system_mode>,<k>,<band0>,<pr0>,<band1>,<pr1>,…,<bandk-1>,<prk-1>
or
%XEMPR=<system_mode>,0,<pr_for_all_bands>
The set command parameters and their defined values are the following:
The following command example reduces the maximum TX power on all bands in the NB-IoT mode by 1 dB:
AT%XEMPR=0,0,2
OK
The following command
example reduces the maximum TX power on three (<k>=3
) bands in the LTE-M
mode (<system_mode>=1
). The maximum TX power is reduced by 1 dB on bands
5 and 8 and by 0.5 dB on band
13:
AT%XEMPR=1,3,5,2,8,2,13,1
OK
The following command example deletes the existing configuration by sending the command without any parameters:
AT%XEMPR
OK