The set command sets the requested network time support.
Network time support is enabled by default. 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.
Active %XPOFWARN warning blocks the storing to
NVM.v1.3.x≥2The network time may be received
in NITZ IE as a part of EMM information message or from SIB16. If both are available, the
SIB16 time is prioritized due to higher accuracy. SIB16 reception has its own control
options in addition to the network time support. If optional parameter for SIB16 support is
not set, the functionality is as specified in parameter value
2.
Syntax:
%XNETTIME=<network_time_support>[,<sib16_support>]
The
set command parameter and its defined values are the following:
- <network_time_support>
- 0 – Disable network time support.
- 1 – Enable network time support.
- <sib16_support>v1.3.x≥1
- 0 – Support for time information from SIB16 is disabled.
- 1 – The modem supports time information from SIB16. When a cell is changed before
starting idle mode operations or entering a connection, the modem attempts to receive
SIB16 until it is received successfully. The cell selections might take more time, but
the time information from SIB16 is more likely available for applications after a cell
has been selected, for example, during the first connection that is established after
modem activation.
- 2 – The modem supports time information from SIB16. The SIB16 reception does not cause
delays in cell selections, but the time information from SIB16 is available only after
the modem has been in RRC idle mode long enough to capture the broadcast message.
Note:
- Setting <sib16_support> to 1 might cause a
delay in establishing a connection after modem activation. The delay can be up to 40
seconds in LTE-M and up to 5 minutes 30 seconds in
Narrowband Internet of Things (NB-IoT) in every cell where connection is attempted until
time information from SIB16 is received.
- Setting <sib16_support> to 1 or
2 does not stop the modem from selecting a cell if SIB16 reception
fails, for example, due to poor radio conditions. The modem makes more attempts later to
receive time information from SIB16 during normal idle mode operation before
establishing a connection.
The following command example disables network time
support:
AT%XNETTIME=0
OK