example of connecting to B3@20Mhz earfcn: 1650 phy-cellid: 359
I recomend to try FreqLock who lock band and ca B20/7 can be additional band, the Tower and sector can re-connect and give differ speeds.
/interface lte at-chat lte1 input=“at*cell=1,3,1650”
or a CellLock to specific tower with his specific antenna
/interface lte at-chat lte1 input=“at*cell=2,3,1650,359”
Try them !
You can use a Track LTE parameters script what is publish here: http://forum.mikrotik.com/t/sxt-lte-4g-cat6/134468/1