I use RUTX09 with RUTX_R_00.02.06.01 FW.
I connect to an LTE BTS providing B28, B20 and B3. I get a very bad issue when B20 and B28 allowed at the same time.
When I select "auto" band selection or when in manual band selection I have both B20 and B28 selected, B28 cells never appear in neighbour cells (gsmctrl -I).
As soon as I use manual band selection and get B20 unselected, B28 cells appears in neighbour cells as expected.
As a consequence the best B28 cell is never used by the modem when B20 is selected regardless the closest B28 cells offer generally a significantly better radio link than the B20 ones.
And unfortunately manual B3 + B28 manual selection is not a workaround, as I then face to another issue where all B28 cells disappear after some time with no more possible carrier aggregation with B3, and I need a modem reset to get B28 reappear and getting B28+B3 carrier aggregation again, see the issue depicted here.
Following are some console captures to illustrate issue with B20+B28 selected at the same time. I just performed some gsmctl commands to print serving cell SINR, visible cells list and serving cell data:
I select in web UI "auto" band selection => no B28 cells visible and B20 PCI 404 selected as serving cell:
root@Teltonika-RUTX09:~# gsmctl --sinr ;gsmctl -I; gsmctl -K
3.5
+QENG: "neighbourcell intra","LTE",6400,404,-9,-96,-68,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,29,-18,-109,-78,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,45,-18,-109,-74,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,26,-19,-109,-74,0,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,230,-11,-116,-82,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,327,-18,-125,-97,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,143,-20,-125,-97,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,491,-20,-125,-97,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,14,-20,-125,-95,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,115,-20,-127,-96,0,-,-,-,-
+QENG: "servingcell","NOCONN","LTE","FDD",208,01,EDFA04,404,6400,20,3,3,3943,-96,-9,-71,13,-
Right after I select all bands except B20 => now B28 cells are there (and PCI 164 is very good !) and B28 PCI 164 selected as serving cell:
root@Teltonika-RUTX09:~# gsmctl --sinr ;gsmctl -I; gsmctl -K
11.5
+QENG: "neighbourcell intra","LTE",9310,164,-7,-98,-71,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",9310,366,-18,-108,-80,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",9310,186,-19,-113,-84,0,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,230,-7,-112,-83,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,327,-20,-127,-98,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,143,-16,-122,-98,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,48,-20,-125,-95,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,491,-20,-127,-98,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,0,0,0,0,0,-,-,-,-
+QENG: "servingcell","NOCONN","LTE","FDD",208,01,EDFA01,164,9310,28,3,3,3943,-98,-7,-73,16,-
Then selecting B3+B20+B28 => once again no B28 cells anymore and B20 is selected as serving cell:
root@Teltonika-RUTX09:~# gsmctl --sinr ;gsmctl -I; gsmctl -K
5.3
+QENG: "neighbourcell intra","LTE",6400,404,-10,-96,-67,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,45,-16,-105,-78,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,29,-20,-108,-77,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,202,-20,-108,-79,0,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,230,-9,-111,-81,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,327,-17,-124,-97,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,115,-16,-121,-96,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,14,-19,-125,-96,0,-,-,-,-
+QENG: "neighbourcell inter","LTE",1300,143,-20,-126,-97,0,-,-,-,-
+QENG: "servingcell","NOCONN","LTE","FDD",208,01,EDFA04,404,6400,20,3,3,3943,-96,-10,-70,12,-
Selecting only B20+B28 => still no B28 cells are visible and B20 is selected as serving cell:
root@Teltonika-RUTX09:~# gsmctl --sinr ;gsmctl -I; gsmctl -K
4.1
+QENG: "neighbourcell intra","LTE",6400,404,-11,-98,-69,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,45,-19,-108,-79,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,202,-20,-107,-78,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,29,-19,-107,-77,0,-,-,-,-,-
+QENG: "neighbourcell intra","LTE",6400,336,-18,-106,-77,0,-,-,-,-,-
+QENG: "servingcell","NOCONN","LTE","FDD",208,01,EDFA04,404,6400,20,3,3,3943,-98,-11,-67,11,-
Anyone having same issue or any workaround ?