Question: In a 5G network with an Interworking User Plane Function (I-UPF), why is measuring round-trip GTP packet delay on the N9 interface between PSA UPF and I-UPF particularly important?
Option 1: To optimize signaling protocols for voice services only.
Option 2: For evaluating, optimizing, and assuring performance of DL/UL data packets, considering their impact on end-to-end packet delay.
Option 3: Exclusively to manage UE (User Equipment) mobility between different Radio Access Networks (RANs).
Option 4: To prioritize GTP packets using DSCP without any performance measurement.
Explanation: Measuring round-trip GTP packet delay on the N9 interface is crucial for assessing and enhancing the performance of both downlink (DL) and uplink (UL) data packets. This is particularly significant because delays in these packets can noticeably affect the end-user experience, especially for services sensitive to latency. By evaluating this delay, network operators can optimize the performance of the N9 interface between PSA UPF and I-UPF, ultimately contributing to better end-to-end (e2e) packet transmission efficiency from UE to PSA UPF.