Power Saving Mode not working in BG96

IoT Modules LPWA Module
1

Hi,

We are testing power saving mode with BG96/BG95:
However after active time expiry the device enters in PSM mode.
Expectations are that it will exit from PSM when periodic timer expire and will send TAU Request.
Unfortunately every time the device exits with Attach Request instead of TAU Request.
The device is directly connected to a laptop with USB.

The at command sequence is below.
Any advise is appreciated.
Thanks,
Svetlin

[13:14:06.070] AT+COPS?
[13:14:06.070]
[13:14:06.070] +COPS: 1,2,“xxxxxx”,9
[13:14:06.070]
[13:14:06.070] OK
[13:14:23.991]
[13:14:23.991] AT+QPSMEXTCFG=14,2,120,5,120,3
[13:14:24.004]
[13:14:24.004] AT+QPSMEXTCFG=14,2,120,5,120,3
[13:14:24.004]
[13:14:24.004] OK
[13:14:34.210]
[13:14:34.210] AT+QPSMCFG=60,4
[13:14:34.234]
[13:14:34.234] AT+QPSMCFG=60,4
[13:14:34.234]
[13:14:34.234] OK
[13:14:41.365]
[13:14:41.365] AT+QCFG=“psm/urc”,1
[13:14:41.378]
[13:14:41.378] AT+QCFG=“psm/urc”,1
[13:14:41.378]
[13:14:41.378] OK
[13:14:52.008]
[13:14:52.008] AT+CEREG=4
[13:14:52.021]
[13:14:52.021] AT+CEREG=4
[13:14:52.021]
[13:14:52.021] OK
[13:15:07.823]
[13:15:07.823] AT+CPSMS=1,“10101010”,“00100101”
[13:15:07.837]
[13:15:07.837] AT+CPSMS=1,“10101010”,“00100101”
[13:15:07.837]
[13:15:07.837] OK
[13:15:09.259]
[13:15:09.259] +CEREG: 1,“2337”,“75B”,9,“00100101”,“10010100”
[13:15:09.368]
[13:15:09.368] +QPSMTIMER: 600,300
[13:15:21.816]
[13:15:21.816] AT+CEREG?
[13:15:21.830]
[13:15:21.830] AT+CEREG?
[13:15:21.830]
[13:15:21.830] +CEREG: 4,1,“2337”,“75B”,9,“00100101”,“10010100”
[13:15:21.830]
[13:15:21.830] OK
[13:15:39.436]
[13:15:39.436] AT+cpsms?
[13:15:39.445]
[13:15:39.445] AT+cpsms?
[13:15:39.445]
[13:15:39.445] +CPSMS: 1,“10010100”,“00100101”
[13:15:39.445]
[13:15:39.445] OK
[13:15:47.193]
[13:15:47.193] at+qpsms?
[13:15:47.206]
[13:15:47.206] at+qpsms?
[13:15:47.206]
[13:15:47.206] +QPSMS: 1,“600”,“300”
[13:15:47.206]
[13:15:47.206] OK
[13:15:55.709]
[13:15:55.709] at+cops?
[13:15:55.722]
[13:15:55.722] at+cops?
[13:15:55.722]
[13:15:55.722] +cops: 1,2,“xxxxx”,9
[13:15:55.722]
[13:15:55.722] OK

2

pls confirm , when the T3324 is time out , no data service is requested . for the detail we need the QXDM log for more analysis.

3

Hi Stephen.Li-Q,
After T3324 timer expiry the modem enters PSM. All communication to the modem is lost. Even the COM port. After periodic timer expiry the modem sends attach request to the network and the modem is again avaialble on the com port.

Thanks,
Svetlin