4.4 Speed up registration
The registration process in CAT-M1 and NB-IoT technologies could require some minutes to
complete. This happens especially in the case of very first registration: new SIM, new location,
new module. This is due to the IoT technology itself and cellular network deployment factors.
To speed up the process you can reduce the set of supported technologies and bands. This
will reduce the radio scanning time of the module. The example below refers to NB-IoT, the
same can be applied to CAT-M1.
1. Check with operator if:
a. the SIM you have is enabled for NB-IoT or CAT-M1; the majority of operators
provides specific SIM for IoT services and technology
b. an APN has to be set for registration/attach and data traffic
2. Turn on the module and set the APN if required, in the majority of cases you'll have to
set it on 1st context: e.g. AT+CGDCONT=1,"IP","NB IoT APN"
3. Set the module for NB IoT only support: AT+WS46=28 , AT#WS46=1
4. Use AT#BND to reduce the set of supported bands. E.g. set support for band 3 and 8
only: AT#BND=0,0,132 (132 decimal ► 0010 1000 binary )
5. Reboot the module to apply the changes above
6. When the module is back on, wait some seconds and run manual registration through
AT+COPS=1,2,"MCCMNC"
7. Poll AT+CEREG? to check the registration status or enable unsolicited indication
through AT+CEREG=2
The same will apply for CAT-M1 using AT#WS46=0.
The reboot is required only once to apply the AT#WS46 setting. Subsequent registrations are
usually faster (e.g. after power cycle): the module store radio link information about previous
registration and use this information to start a new registration.
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