5G(NR) carrier aggregation bandwidth class definition

1、Carrier aggregation (CA) is used to increase the bandwidth of a terminal (UE) for wireless communications by combining multiple carriers, where each aggregated carrier is called a component carrier (CC). carrier aggregation (CA) for 5G (NR) systems supports up to 16 contiguous and non-contiguous component carriers with different subcarrier intervals; carrier aggregation configurations include the type of carrier aggregation (in-band, contiguous or non-contiguous, or inter-band) The carrier aggregation configuration includes the type of carrier aggregation (in-band or non-contiguous or inter-band), the number of frequency bands and the bandwidth category.

2、The aggregation bandwidth category is identified in 5G(NR) with a series of alphabetical identifiers that define the minimum and maximum bandwidth and the number of component carriers.
Among them:

• The 5G carrier aggregation CA supports up to 16 contiguous and non-contiguous component carriers with different SCSs;
• CA classes from A~O in FR1 (Release17);
• The maximum total bandwidth allowed by the CA in FR1 band is 400MHz;
• CA class from A~Q in FR2 (Release17) The maximum total bandwidth allowed for FR2 band CA is 800MHz;

3、FR1 carrier aggregation bandwidth

• Class A:Corresponds to Wireless Channel Carrier Aggregation 5G(NR) Configuration. The maximum BWChannel (carrier band) depends on the band number and the parameter set. The parameter set defines the SCS (Sub Carrier Spacing) between subcarriers.Class A belongs to all fallback groups and allows the UE to return to the basic configuration without aggregating carriers.
• Class B: corresponds to the aggregation of 2 radio channels to obtain a total bandwidth between 20 and 100 MHz; Class C: corresponds to the aggregation of 2 radio channels to obtain a total bandwidth between 20 and 100 MHz.
• Class C: corresponds to the aggregation of 2 radio channels to obtain a total bandwidth between 100 and 200 MHz; Class D: corresponds to the aggregation of 2 radio channels to obtain a total bandwidth between 20 and 100 MHz.
• Class D: the total bandwidth obtained by aggregating 3 wireless channels is between 200 and 300 MHz; Class E: the total bandwidth obtained by aggregating 4 wireless channels is between 300 and 400 MHz.

---- Classes C, D and E belong to the same fallback group 1.

• Class G: corresponds to the aggregation of 3 wireless channels to obtain a total bandwidth between 100~150MHz.
• Class H: corresponds to the aggregation of 4 radio channels with a total bandwidth between 150 and 200 MHz.
• Class I: corresponds to 5 radio channels aggregated into a total bandwidth between 200 and 250 MHz.
• Class J: corresponding to 6 radio channels aggregated into a total bandwidth between 250~300MHz
• Class K: corresponds to 7 wireless channels aggregated into a total bandwidth between 300~350MHz.
• Class L: corresponds to 8 wireless channels aggregated into a total bandwidth between 350~400MHz.

-----G~L class belongs to the same fallback group2

4、FR2 Carrier Aggregation Bandwidth

• Class A: Corresponds to the No Carrier Aggregation 5G (NR) configuration. The maximum BWChannel (carrier band) depends on the band number and the parameter set. The parameter set defines the SCS (Sub-Carrier Spacing) between subcarriers; ---- Class A belongs to all fallback groups and allows the UE to return to the basic configuration without aggregating carriers.
• Class B: corresponds to 2 wireless channels aggregated with a total bandwidth between 400 and 800 MHz
• Class C:Corresponds to 2 wireless channels aggregated with total bandwidth between 800~1200MHz.

---- Class B is the fallback group of Class C, both belong to the same fallback group 1.

• Class D: corresponds to 2 wireless channels with aggregated total bandwidth between 200~400MHz.
• Class E: corresponds to 3 wireless channels with aggregated total bandwidth between 400 and 600 MHz.
• Class F: corresponds to 4 wireless channels aggregated with a total bandwidth between 600 and 800 MHz.

----D, E and F classes belong to the same fallback group 2.

• Class G: corresponds to 2 wireless channels aggregated with total bandwidth between 100~200 MHz Class H: corresponds to 3 wireless channels aggregated with total bandwidth between 200~300 MHz
• Class I: corresponds to 4 wireless channels with aggregated total bandwidth between 300 and 400 MHz.
• Class J: corresponding to 5 wireless channels aggregated total bandwidth between 400~500MHz
• Class K: corresponding to 6 wireless channels aggregated with a total bandwidth of 500~600MHz
• Class L: corresponds to 7 wireless channels aggregated with total bandwidth between 600~700MHz
• Class M: corresponds to 8 wireless channels aggregated with a total bandwidth between 700 and 800 MHz.

----G, H, I, J, K, L and M classes belong to the same fallback group 3.