Implementation of VoLTE considering different QoS and QoE overall approaches

The main goal of this thesis is to study the impact in other services of deploying VoLTE over an existing LTE network while monitoring VoLTE call quality. The QoS performance of seven distinct services is analysed in terms of allocation delay, packet failure and throughput satisfaction. QoE for VoLTE users is assessed using the E-model. For that purpose, a single-cell model for the DL resource allocation in LTE was proposed and implemented on a time based simulator. Several parameters were analysed, namely number of users, type of environment, bandwidth and other service-related parameters. As VoLTE is the highest priority service, call quality is barely affected for realistic numbers of users. For the reference urban scenario being considered, one concludes that up to 60 and 36 simultaneous VoLTE users are supported for the AMR-WB and EVS codecs, respectively, without significant impact in other services. Regarding system bandwidth, 10 and 20 MHz bandwidths were compared, being observed that the offered throughput scales linearly with the system bandwidth. The cell throughput for the urban scenario is 38% above the rural one and no significant difference is observed between urban and suburban ones. Finally, the service penetration influence was analysed by defining a VoLTE centric scenario and a Video centric one. In the Video centric scenario, the percentages of satisfied users for the services with a lower priority than video streaming stay below 50%. For the VoLTE centric scenario, user satisfaction levels are above