Question: Under what condition can a UE in enhanced coverage report its coarse location information to the eNodeB (eNB), and what is the expected accuracy of this location information?
Option 1: After AS security is established in connected mode, with an accuracy of approximately 2km, using most significant bits of GNSS coordinates.
Option 2: Immediately upon power-up, with an accuracy of about 100m, utilizing full GNSS coordinates.
Option 3: Only when handover is initiated, with variable accuracy based on available cell ID location.
Option 4: After completing a voice call, with an estimated accuracy of around 500m, relying on triangulation from nearby base stations.
Explanation: The reporting of coarse UE location information is contingent upon the establishment of AS security in connected mode, ensuring a secure environment for the exchange. The use of most significant bits of GNSS coordinates provides an efficient method to achieve an accuracy of about 2km, striking a balance between precision and data overhead, particularly relevant for Battery Life UEs and those in enhanced coverage scenarios.