Question: In E-UTRA, what is the primary purpose of the `maxNumberUpdatedCSI-Proc-STTI-Comb22-Set2-r15` field for a User Equipment (UE) with more than 2 Component Carriers (CCs)?
Option 1: To limit the maximum number of serving cells for Carrier Aggregation (CA).
Option 2: To define the maximum number of CSI processes updated per UE for aperiodic CSI reporting on short TTI for CA with >2 CCs.
Option 3: To specify the minimum required bandwidth for short TTI transmissions in CA scenarios.
Option 4: To indicate UE support for MIMO schemes in conjunction with short TTI.
Explanation: This field is specifically related to configuring Channel State Information (CSI) reporting processes for UEs operating with more than two Component Carriers in Carrier Aggregation scenarios, focusing on short Transmission Time Interval configurations. The correct answer reflects its purpose in managing CSI updates efficiently in complex CA setups.