Question: In a carrier aggregation scenario involving both FDD and TDD bands, what capability must a UE (User Equipment) support for each band combination?
Option 1: Simultaneous reception and transmission on different bands
Option 2: Sequential switching between FDD and TDD bands for transmission and reception
Option 3: Reception only on FDD bands and transmission only on TDD bands
Option 4: Transmission only on FDD bands and reception only on TDD bands
Explanation: This correct answer reflects the requirement for UEs to handle simultaneous reception and transmission but specifically notes this is on different bands for each combination that includes at least one FDD band and one TDD band. This capability is crucial for efficient carrier aggregation, especially in mixed duplex mode scenarios, ensuring seamless communication without the need for switching between modes for different bands.