Question: What are the key factors considered by Inter-RAT Radio Resource Management (RRM) during an inter-RAT handover decision in a heterogeneous network deployment?
Option 1: Only the resource situation of the target RAT (Radio Access Technology)
Option 2: UE (User Equipment) capabilities, but not Operator policies
Option 3: The resource situation of only the serving RAT (Radio Access Technology)
Option 4: Both involved RATs' resource situations, UE capabilities, and Operator policies
Explanation: Inter-RAT RRM optimizes resource utilization during handovers between different radio access technologies. Considering both the serving and target RAT's resource situations ensures efficient allocation. Additionally, incorporating UE capabilities (e.g., supported frequencies) and Operator policies (e.g., load balancing strategies or service priorities) into the decision-making process enables a more informed, tailored, and effective handover management. This comprehensive approach is crucial for maintaining seamless connectivity and overall network performance in heterogeneous deployments.