This study evaluated the VoIP service throughput performance on a 4G LTE network using Network Simulator 3 (NS-3) with variations in the number of users. The simulation was conducted using a single eNodeB with user variations of 5, 10, 15, and 20 UEs. Traffic was generated using the UDP protocol with a packet size of 160 bytes and a send interval of 20 ms over 60 seconds. Measurements were done using NS-3, and results were displayed in the FlowMonitor on an Ubuntu terminal by observing the amount of data and packets successfully received as well as the total throughput in each scenario. The simulation results showed that the total throughput obtained for each user variation was 752.29 Kbps, 1,504.51 Kbps, 2,256.67 Kbps, and 3,008.83 Kbps. This increasing pattern indicates an almost linear relationship between the number of users and the aggregate throughput. Meanwhile, the average throughput, calculated by dividing the total throughput by the number of users, was around 150.44–150.46 Kbps. This research shows the characteristics of throughput in the traffic configurations and topologies tested. The results can serve as a basis for further testing with different traffic loads and other Quality of Service (QoS) parameters.
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