Question: In E-UTRA, what is a mandatory requirement for UEs supporting inter-band TDD carrier aggregation or dual connectivity with at least two TDD bands within the same cell group?
Option 1: Supporting simultaneous UL/DL on all aggregated carriers
Option 2: Supporting different UL/DL configurations for each TDD band
Option 3: Restricting to a single UL/DL configuration across all aggregated carriers
Option 4: Mandatory support for FDD bands in addition to TDD bands
Explanation: This is correct because UEs must handle different uplink (UL) and downlink (DL) configurations when aggregating or connecting with multiple TDD bands in inter-band scenarios, allowing the network to optimize resource allocation based on specific band needs and traffic conditions, enhancing user experience and network efficiency.