Does UE knows PDCCH format (1,2,3,4) before doing blind decoding?

Question

How PCEF decide which QCI_X(where X = 1,2,3,4,5,6,7,8,9,65,66,67,68,69,70) value need to be send to PCRF.
What is the significance of so many QOS-Class-Identifiers?
Even 3GPP 29.212 doesn't define any reason for classification between different QOS-Class-Identifiers.

Answer 1

No, UE doesn't know about PDCCH format before decoding, it tries all possible formats to decode the PDCCH data.