Question: In mission critical (MC) services, as per 3GPP standards, what is the primary approach for a User Equipment (UE) to maintain service continuity when moving out of E-UTRAN coverage?
Option 1: Utilize a Proximity-based Services (ProSe) UE-to-network relay to support seamless handover.
Option 2: Automatically switch to Circuit Switched (CS) media flow for continued connectivity.
Option 3: Initiate a new session using only CS media flow upon approaching the edge of E-UTRAN coverage.
Option 4: Depend on external non-3GPP networks for temporary service continuation.
Explanation: Maintaining service continuity is crucial in mission-critical communications. According to 3GPP standards, when a UE is about to lose E-UTRAN coverage, leveraging ProSe UE-to-network relay capabilities is the preferred method to ensure uninterrupted service. This approach enables the UE to utilize another UE's network connection (acting as a relay) to maintain connectivity, thereby supporting service continuity for mission-critical services.