I use the RUTX50 on the network of the Croatian telecom (deutsche telecom group) in combination with 2x2 MIMO external directional antennas.
The base station I am connecting to supports aggregations:
B1(15MHz)+B3(20MHz)+B3(10Mhz)+B20(15MHz)+B28(10Mhz) on the same eNB ID, 4x2 MIMO
Other devices measure speeds of 350+ Mbps, and the RUTX50 only connects to two aggregations, mostly B1+B3, and speeds reach 200-250 Mbps.
When I lock the main cell to B3(10Mhz), then it works 4CA (B1+B3+B3+B20/28 or B1+B3+B20+B28) but the speeds are still up to 200 Mbps, even lower than on 2CA.
5CA in DL never worked.
I noticed that the modem does not know how to aggregate upload bands when the main cell is B3 (10Mhz), the upload speed goes up to a maximum of 45 Mbps.
The technician from Croatian Telecom says that with this modem I should have speeds of at least 400 Mbps at the base station I connect to if 4CA or 5CA is used.
I also noticed in the webUI under Status > Network that it never says more than 3CA even though gsmctl -A ‘AT+QCAINFO’ shows that the modem is using 4CA.
Fw version: RUTX_R_00.07.04.5
Internal modem firmware version: RG501QEUAAR12A08M4G_04.200.04.200
Are you able to check this and adjust the modem for correct aggregation of bands on Croatian telecom networks?