I have ab EM12 modem in a Mikrotik Chateau LTE12 router.
I have modem using B1, B3 and B7 but B7 signal is weak/fluctuating.
When LTE link is brought up, it created 3CA with B3 as primary and B1+B7 as aggregate bands.
After a little bit (few minutes) B7 is removed from the CA and the modem never adds it again,
in fact remains a 2CA until next disconnection and reconnection.
I suspect that the B7 band is selected even if weak at link initialization, but then is dropped
and never evaluated again. I think this is incorrect and B7 should be re-evaluated for CA
as soon as the signal improves.
Is there a modem option to tweak sensitivity for this?
primary-band: B1@10Mhz earfcn: 150 phy-cellid: 81 ca-band: B7@20Mhz earfcn: 3350 phy-cellid: 280,B3@20Mhz earfcn: 1650 phy-cellid: 81 Columns: PHY-CELLID, BAND, EARFCN, RSRP, RSRQ, RSSI, AGE PHY BA EARF RSRP RSRQ RSSI AG 81 B1 150 -95dBm -9dB -69dBm 2s 81 B3 1650 -94dBm -12dB -72dBm 2s 273 B7 3350 -117dBm -15dB -93dBm 2s 280 B7 3350 -111dBm -11dB -91dBm 2s <---- weak/fluctuating B7 399 B1 150 -106dBm -20dB -72dBm 2s 399 B3 1650 -104dBm -19dB -75dBm 2s 400 B1 150 -104dBm -12dB -83dBm 5s 400 B3 1650 -100dBm -15dB -75dBm 2s