Question: What is a prerequisite for a User Equipment (UE) to mandatorily support the "ho-EUTRA-5GC-FDD-TDD-r15" field, indicating handover capability between E-UTRA/5GC FDD and TDD?
Option 1: The UE must support only E-UTRA/5GC FDD.
Option 2: The UE is of a release prior to the current specification.
Option 3: The UE supports another RAT (Radio Access Technology) exclusively.
Option 4: The UE supports eutra-5GC-r15 and both associated FDD and TDD RATs.
Explanation: For a UE to be required to support the handover field between E-UTRA/5GC FDD and TDD, it must fulfill specific conditions related to its capabilities. Supporting eutra-5GC-r15 is crucial, but equally important is the UE's capability with both FDD (Frequency Division Duplex) and TDD (Time Division Duplex) modes of the associated Radio Access Technologies (RATs). This ensures seamless handovers between these different duplexing modes, enhancing network efficiency and user experience.