Question: Over which interfaces does the load reporting function exchange cell-specific load information in an intra-LTE scenario and inter-RAT (or EN-DC) scenario, respectively?
Option 1: X2 for intra-LTE, S5 for inter-RAT/EN-DC
Option 2: X2 for intra-LTE, S1 for inter-RAT/EN-DC
Option 3: S1 for intra-LTE, X2 for inter-RAT/EN-DC
Option 4: S10 for intra-LTE, S11 for inter-RAT/EN-DC
Explanation: In an intra-LTE scenario, neighbor eNodeBs use the X2 interface for direct communication, including exchanging cell-specific load information. For inter-RAT or EN-DC scenarios, involving different radio access networks, the S1 interface is utilized for communication between the E-UTRAN and other network elements, facilitating load information exchange.