Question: What is the primary focus of an E-UTRAN Key Performance Indicator (KPI) for end-user service integrity, as defined by specification level requirements?
Option 1: To indicate E-UTRAN's contribution to end-user impact, focusing only on aspects within E-UTRAN's control, such as IP packet delivery.
Option 2: To measure and take responsibility for the entire end-to-end service integrity, including parts outside E-UTRAN's control.
Option 3: To exclusively monitor throughput for non-GBR services, disregarding other integrity measurements.
Option 4: To assess the overall network operator's service quality without considering specific E-UTRAN contributions.
Explanation: According to the specification level requirements, an E-UTRAN KPI for end-user service integrity should be defined to indicate only the contribution of E-UTRAN (e.g., delivery of IP packets) and not attempt to cover the entire end-to-end service integrity, which includes parts outside E-UTRAN's control. This ensures the KPI accurately reflects E-UTRAN's impact on service quality.