Simulation and Analysis of Quality of Service (QoS) Parameters of Voice over IP (VoIP) Traffic through Heterogeneous Networks

摘要

Identifying those causes and parameters that affect the Quality of Service(QoS) of Voice-over-Internet Protocol (VoIP) through heterogeneous networkssuch as WiFi, WiMAX and between them are carried out using the OPNET simulationtool. Optimization of the network for both intra- and intersystem traffic tomitigate the deterioration of the QoS are discussed. The average value of thejitter of the VoIP traffic traversing through the WiFi-WiMAX network wasobserved to be higher than that of utilizing WiFi alone at some points in time.It is routinely surmised to be less than that of transiting across the WiFinetwork only and obviously higher than passing through the increased bandwidthnetwork of WiMAX. Moreover, both the values of the packet end-to-end delay andthe Mean Opinion Score (MOS) were considerably higher than expected. Theconsequences of this optimization, leading to a solution, which can amelioratethe QoS over these networks are analyzed and offered as the conclusion of thisongoing research.