Question: For which purpose is the E-UTRAN FDD RSRP (Reference Signal Received Power) absolute accuracy measurement primarily utilized in a network comprising both UTRAN FDD and E-UTRAN FDD?
Option 1: Handover between UTRAN FDD and E-UTRAN FDD
Option 2: Load Balancing within the same Radio Access Technology (RAT)
Option 3: Inter-RAT Cell Identification for LTE to UMTS Redirection
Option 4: Throughput Optimization for UE in Idle Mode
Explanation: The E-UTRAN FDD RSRP absolute accuracy measurement is crucial for ensuring seamless handovers between different radio access technologies (e.g., from UTRAN FDD to E-UTRAN FDD). This measurement's precision directly impacts the network's ability to make informed handover decisions, thereby affecting user experience. The other options, while relevant to network operations, do not directly relate to the primary purpose of RSRP absolute accuracy in the context of handovers between UTRAN FDD and E-UTRAN FDD.