Long-term evolution (LTE) is becoming the first choice of mobile network operators (MNOs) when constructing a wireless\nnetwork infrastructure because of its high data rate, high throughput, and low latency. These significant advancements\nare necessary for satisfying the delivery of a wide-range of mobile applications and managed network resources.\nHowever, deploying a new LTE network or a transition from current legacy cellular networks to LTE can take several years\nto roll out. In the meantime, working in a heterogeneous wireless communication network looks inevitable. This paper\ninvestigates Voice over LTE (VoLTE) Quality of Service (QoS) under a heterogeneous wireless communication scenario. The\ncontributions of this paper are twofold. First, a novel downlink (DL) semi-persistent scheduling scheme is proposed to\nreduce VoLTE end-to-end delay and increase system capacity. Second, an extensive network simulation model has been\ndesigned and implemented to evaluate the proposed scheme. The performance of the proposed scheme is compared\nwith the performance of two relevant and well-known DL packet scheduling methods. The simulation results confirm\nthat the proposed scheme is able to reduce VoLTE end-to-end delay and achieve a better system capacity than current\nmethods, and maintain the desired VoLTE QoS.
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