The new technology is all-IP and is a pure packet-switched (PS) domain wireless network. The LTE core network, known as the Evolved Packet Core (EPC), lacks native support for circuit-switched (CS) connections.
As a result of these significant improvements, an explosive growth has started in LTE wireless multimedia traffic, which is characterized by different QoS requirements. LTE offers higher data rate, spectral efficiency and multiuser flexibility, and lower latency than the third-generation (3G) Universal Mobile Telecommunications System (UMTS). The fourth-generation (4G) long-term evolution (LTE) was standardized by the Third-Generation Partnership Project (3GPP) in Release 8 (R8) technical specification. The simulation results confirm that the proposed scheme is able to reduce VoLTE end-to-end delay and achieve a better system capacity than current methods, and maintain the desired VoLTE QoS. The performance of the proposed scheme is compared with the performance of two relevant and well-known DL packet scheduling methods. Second, an extensive network simulation model has been designed and implemented to evaluate the proposed scheme. First, a novel downlink (DL) semi-persistent scheduling scheme is proposed to reduce VoLTE end-to-end delay and increase system capacity. The contributions of this paper are twofold.
This paper investigates Voice over LTE (VoLTE) Quality of Service (QoS) under a heterogeneous wireless communication scenario. In the meantime, working in a heterogeneous wireless communication network looks inevitable. However, deploying a new LTE network or a transition from current legacy cellular networks to LTE can take several years to roll out. These significant advancements are necessary for satisfying the delivery of a wide-range of mobile applications and managed network resources. Long-term evolution (LTE) is becoming the first choice of mobile network operators (MNOs) when constructing a wireless network infrastructure because of its high data rate, high throughput, and low latency.
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