d the field results. CHAPTER 1 NETWORK PLANNING Key Performance Indicator Verification The KPIs are very important aspects for any network element because they determine the need and the nature of optimization that will be required. The 3GPP has standardized the areas for KPI validation in TS 32.425 as: Accessibility of KPI testing Retainability of KPI testing Integrity of KPI testing Availability of KPI testing Mobility of KPI testing Accessibility of KPI Testing Accessibility KPIs mainly determine how easy it is for the user to obtain service within specified tolerances and other given conditions. The radio resource control (RRC) establishment success rate is a common KPI in this category. Other examples include paging congestion rate, RRC reestablishment success rate, RRC reconfiguration success rate, initial E-UTRAN radio access bearer (E-RAB) setup success rate, additional E-RAB setup success rate, among others. In order to test accessibility KPI cases (i.e., the RRC establishment success rate), these considerations are required: The environment should consist of multiple UEs attempting RRC connections to move from the RRC_IDLE to the RRC_CONNECTED state. The UEs should attempt RRC connection setup at a higher rate of around 10 to 20 RRC connection setups per sector per second. In order to maintain a constant number of connected users per sector, it is also required to ensure a steady rate of users moving from the RRC_CONNECTED to the RRC_IDLE state per sector. At the end of the granularity period (which is known), the RRC establishment success rate KPI is derived using the following equation: RRCConnect ion Success RRCS SR = RRCConnectionAttempt The tests can be repeated for different rates of RRC connection setups per second and for different load conditions (e.g., 30% load, 50% load, 70% load, 90% load, etc.). Retainability of KPI Testing Retainability KPIs target evaluation of how easy it is for a user to retain an established service within specified tolerances and other given conditions. Examples for r