BC660, BC66 - PSM disabled with COPS=0 problem

IoT Modules LPWA Module
1

Hello,
We have observed a problem with automatic operator selection and PSM disabled and eDRX enabled. In these situations the BC66 or BC660 module is doing extra communication (looking for another operator?). This extra communication is started by receiving new data via UDP packet. We didn’t observe this when we set the PLNM operator code.

AT command sequence:

AT
OK

AT+CFUN=0
OK

+CPIN: NOT READY
AT+CGMR
Revision: BC660KGLAAR01A05

OK

AT+CPSMS=0
OK

AT+CEDRXS=2,5,"0011"
OK

AT+QICFG="dataformat",1,1
OK

AT+QCFG="slplocktimes",1
OK

AT+QCFG="wakeupRXD",0
OK

AT+CFUN=1
OK

+CPIN: READY
AT
OK

AT+QBAND=2,8,20
OK

AT+QCCID
+QCCID: 89882280666067897797

OK
AT+QCGDEFCONT="IP"
OK

AT+COPS=1,2,"23102"
//AT+COPS=0

OK
AT+CSQ
+CSQ: 99,99

OK

+CSCON: 1


+IP: 10.183.149.166

+CEDRXP: 5,"0011","0011","0011"

AT+CSQ
+CSQ: 31,0

OK
AT+CGATT?
+CGATT: 1

OK
AT+QIOPEN=0,0,"UDP SERVICE","10.66.213.189",2710,2710
OK

+QIOPEN: 0,0

AT+QENG=0
+QENG: 0,6154,12,232,"00008DCA",-65,-9,-56,1,20,"0263",0,-4,2

OK
AT+QENG=2
+QENG: 3,36,44,0

OK
AT+CSCON=1
OK

AT+QISEND=0,"10.66.213.189",2710,38,898822806660678977970100FFFF000000002C000000CA8D0000BF001000004118C926010000,2
OK

SEND OK

+CSCON: 1

+QIURC: "recv",0,5,"10.66.213.189",2710,"00be668165"

image
image685×639 45.3 KB

AT+COPS=1,2,“23102”

image
image1638×764 146 KB

AT+COPS=0

2

Are you currently using a roaming SIM card?

3

Yes, we use 1nce roaming SIM.

4

Roaming card under COPS=0(automatic search network), the module search network is slower, if you use AT+COPS=1,2,, initiate the registration network, then the search network will be faster

5

Problem is not with registration to the network, but after registration via AT+COPS=0, modem doing extra communication after received downlink message from server.

6

I have sent you tools and documents, please grab debug log for detailed analysis