Hi Experts.
Anyone is aware of what is significance of Fallback group in below table?
This table explains NR CA bandwidth class
A fallback group is a set of carrier aggregation bandwidth classes that a user equipment (UE) can support. The UE will fallback to a lower order CA bandwidth class configuration within a fallback group if it is unable to support the current configuration. For example, if a UE is currently configured for CA bandwidth class A, which supports an aggregated channel bandwidth of up to 400 MHz, and it loses access to one of the component carriers, it will fallback to CA bandwidth class B, which supports an aggregated channel bandwidth of up to 200 MHz.
There are four fallback groups in 5G NR:
- Group 1: Supports CA bandwidth classes A and B.
- Group 2: Supports CA bandwidth classes C and D.
- Group 3: Supports CA bandwidth classes E and F.
- Group 4: Supports CA bandwidth classes G and H.
The UE will be assigned to a fallback group based on its capabilities and the capabilities of the available component carriers. For example, a UE that supports CA bandwidth class A will be assigned to group 1, while a UE that only supports CA bandwidth class G will be assigned to group 4.
Fallback groups are used to ensure that the UE can always maintain a connection to the network, even if it loses access to one or more component carriers. This is important for ensuring the reliability and availability of 5G NR services.
Thanks Ravi. But is there any 3GPP reference to this explanation?
I am still not able to understand…
Below table is of FR1, where Class A support Fallback group 1,2,3.
What does it means exactly?
Class A is basic class, class B and C are adding component carriers.
So actually fallback would happen from C->A or C->B for example. How is fallback from A->B?
@sadanandk2 fallbackgroup means that the UE has to support without explicitly including in the capability message