I have tried the following in WP7608, module can wake up after 5 minutes.
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: WP7608
Revision: SWI9X07Y_02.37.03.00 73df45 jenkins 2020/04/08 10:59:14
IMEI: 352913090512345
IMEI SV: 14
FSN: XG207430712345
+GCAP: +CGSM,+DS
OK
at!powerwake=1,300
OK
AT!powermode=3