This document defines key performance indicators (KPIs) for the LTE radio access network (eRAN) to evaluate system performance. It includes KPIs in categories such as accessibility, retainability, mobility, service integrity, utilization, availability, and traffic. Formulas and measurement scopes are provided for each KPI. Related counters used in the calculations are defined in an appendix. The document is intended for network planners, administrators, and operators to monitor and optimize LTE network performance.