Improving QoS of VoIP over 4G LTE

Abstract

4G Mobile communication system LTE is the recent 3GPP (3d generation partnership project) standard for Radio communications, it uses a full IP infrastructure and erase the older CS (Circuit Switched) systems by using only PS (Packet switched) in his EPC (Evolved Packet Core). This evolution posed a problem for operators to support Voice service in 4G LTE without depending on their 2G and 3G networks. 3GPP and GSMA (GSM Association) offered a wonderful solution for that to support voice over IP (VoIP), and that by installing an IMS (IP Multimedia Subsystem) infrastructure that offer voice service and connect LTE Network to it, we call that "VoLTE". Therefore, VoLTE is clearly the future of voice communications since it is over IP and it is compatible with NGN (Next Generation Network) in the fixed network part, also it can ensure a very good QoS (Quality of Service) because IP packet was designed to support high data throughput. This research paper analyzes the influence of link utilization and network congestion on end-to-end basis VoLTE performance. Different scenarios are simulated using LTE-Sim simulator tool in a good way. Finally, comparison among them is provided