For unknown reasons, Sierra still refuses to provide any detailed information about supported Carrier Aggregation and EN-DC band combinations.
Fortunately, the module provides this information itself, via the undocumented “AT!RFCOMBOS” command:
at!rfcombos?
B71A[2];A[1]+B2A[4]+B66A[4]+B66A[4]
...
B3A[4];A[1]+B1A[4]+B3A[4]+B7A[4]+B28A[2]
...
B3A[4];A[1]+B28A[2];A[1]+B1A[4]
...
B48E[2,2,2,2];A[1]+B13A[2]+n66A[4];A[1]
...
Total combos: 3571
OK
- Each line describes an allowed combination.
- Discontigous Bands are separated by ‘+’
- Each Band number is followed by the LTE Bandwidth Class, [A-E]
- Next is the number of MIMO layers, if the Bandwidth class allows multiple component carriers (e.g. 4 for ‘E’) there is one number per CC
- If a Band also supports an Uplink, this is separated by ‘;’ followed by bandwidth class and MIMO layers
I.e. for the “B3A[4];A[1]+B1A[4]+B3A[4]+B7A[4]+B28A[2]” entry above:
- 5 carriers total
- two discontigous component carriers in B3, i.e. there may be a frequency gap between the two
- the first four Bands each support 4 layer MIMO, B28 only 2 layer MIMO
- only one uplink with one MIMO layer
“B3A[4];A[1]+B28A[2];A[1]+B1A[4]”:
- 3 Bands
- 2 uplinks, B3 and B28
“B48E[2,2,2,2];A[1]+B13A[2]+n66A[4];A[1]”
- Four component carriers in B48, i.e. up to 4*20MHz bandwidth
- EN-DC with 5G-NR in Band 66, with four MIMO layers. 5G-NR Bandwidth class A. (Note: Bandwidth classes for LTE and 5G-NR are different).
