LTE Key Performance Indicator Optimization

The long‐term evolution (LTE) network performance measured by network or drive test key performance indicators (KPIs) can be perfected by parameter tuning. The most common KPIs which can be based on either network statistics or drive testing are random access setup success rate, call setup success rate (CSSR), evolved radio access bearer (E‐RAB)drop rate and intra‐LTE handover success rate. Drive testing effort can be directed towards coverage and performance verification following physical layer optimization and some parameter changes. The automatic neighbour relations (ANR) and mobility robustness optimization (MRO) algorithms should be utilized to optimize the neighbour plan, handover triggering parameters and user equipment (UE) mobility performance in general. This chapter discusses these algorithms and analyses the handover signalling and resource allocation for messages. Activation of third generation partnership project (3GPP)‐specified restricted cyclic shift set for random access preamble generation can improve the KPIs for the cells covering the high‐speed train.