International Science Community Association Research Journal of Engineering Sciences 2278-9472 10 1 2021 01 26 Optimization of QoS key parameters in LTE network by using central composite design (CCD) 1 11 EN Bhagat Amit 1 Department of Electronics and Computer Engineering, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Nepal Adhikari Nanda Bikram 2 Department of Electronics and Computer Engineering, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Nepal > Research Paper 2020 7 29 2021 01 26 The quality of service is always desirable and challenging factor from generation to generation. In this research work optimization of QoS key parameters in LTE network using central composite design, different approach has been adapted to optimize quality of service. The motto of selecting this research work was for achieving better quality of service with limited power consumption. In addition, very few researches have been done in optimization and this can be gateway and matter of research for 5G too for focusing on optimizing network parameter for gaining better QoS. In this module, Central Composite Design is considered as fixed method for optimization among many other optimizations approaches available. In this module, both simulation and observation are considered as a system result. It is found that antennae height, antennae gain is impacting quality of service. Along with those antennae parameter other parameter is also taken in consideration. It is considered that these control parameters are impacting coverage, signal level, service area analysis and this research methodology try to check performance of the system on the basis of same performance parameters. The optimum value of azimuth angle, mechanical tilt, antennae gain and antennae height was achieved 8.7-degree, 0 degree, 20 dBi and 27.5m respectively. Performance test and validation of system was done using those optimum value by running simulation on Atoll and compare those result with existing network simulation result. The total coverage area was increased from 92.2% to 99.6% after optimization which was based on LTE band 3, 1800 MHz frequency. The average best signal coverage all over the computational region has risen from -78.56 dBm to -76.31 dBm and service area analysis based on modulation scheme also get enhanced. similarly, poor signal zone reduced from 4% to 0.27% after optimization. Copyright@ International Science Community Association