Documentation: https://wiki.mikrotik.com/wiki/Manual:Interface/LTE
Compare latest firmware: R11e-LTE-US v16.02.183961
Enable LOGs & Monitor changes in LTE parameters: http://forum.mikrotik.com/t/r11e-lte6-2ca-not-staying-connected/136004/22
In Script, Enable first line and disable second one to enable all parameters to log.