Evaluation and Optimization of Quality of Service (QoS) of Mobile Cellular Networks was embarked on as a result of incessant complaints of substandard services by GSM users in Nigeria. It was carried out using a Drive Test aimed to access the live network over an air interface in Nigeria. Five KPIs was used as the metrics for the evaluation which includes: Call Setup Success Rate (CSSR), Call Completion Rate (CCR), Call Drop Rate (CDR), Call Handover Success Rate (CHSR) and Standalone Dedicated Control Channel (SDCCH). Data collated from these KPIs was analyzed against the regulators threshold levels. Chi-Square Test was later used to determine whether the KPI values collated differ significantly with the regulators threshold. However, the performance of these KPIs across the Networks was unfortunately found to be below standard with 30% deviation with respect to the regulators threshold levels especially on the CHSR during the Month of March, 2012, though the validation test carried out on April, 2012 showed 25% deviation. Hence, a holistic Network Optimization was carried out using an Adaptive Network-Based Fuzzy Inference System (ANFIS) Model. This was done to boost the performance of the KPIs to the expected level that could guarantee a better Quality of Service.
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