Question: How does a Mobile Node (MN) convey updated Additional RRM Policy Index (ARPI)/Subscriber Profile ID for RAT/Frequency Priority (SPID) information in an EN-DC scenario?
Option 1: Via S1AP messages to the MeNB.
Option 2: Through NAS signaling with the core network.
Option 3: Using X2AP messages directly to the SeNB.
Option 4: By conveying it via X2AP messages to the SN.
Explanation: In an EN-DC (Evolved Universal Terrestrial Radio Access Network - Dual Connectivity) scenario, where a mobile node is connected to both Master eNodeB (MeNB) and Secondary eNodeB (SeNB), conveying updated ARPI/SPID information is crucial for efficient radio resource management. The correct method involves the MN sending this information via X2AP messages to the Serving Network (SN). This ensures that the SN has the most current policies and priorities, enabling it to make informed decisions regarding resource allocation and handovers.