Question: In a scenario where a User Equipment (UE) supports multiple Access Networks, what are the possible capabilities regarding simultaneous transmission and reception assumed by 3GPP for IMS Service Continuity?
Option 1: The UE can only transmit in one Access Network at a time but can receive from multiple networks simultaneously.
Option 2: The UE is limited to either transmitting or receiving (not both) across all connected Access Networks at any given time.
Option 3: The UE may either be capable of transmitting and receiving simultaneously in multiple Access Networks, or it may only support transmission and reception in one Access Network at a time.
Option 4: The UE must always transmit and receive simultaneously in all available Access Networks.
Explanation: This option correctly reflects the assumption that UEs can have varying capabilities - some might support simultaneous multi-network operations (transmitting and receiving in multiple networks at once), while others might only manage single-network operations (transmitting and receiving in just one network at a time). This aligns with practical telecom scenarios where device capabilities can vary widely.