الفهرس 
Multi-Protocol Label Switching (MPLS)Only 14 pages are availabe for public view
 |  | from | 105 |  |  |
| | | from | 105 | | |
Abstract
Nowadays, real-time applications involve Voice over IP (VoIP) and video conferencing are gaining an increasing popularity. MPLS is considered as the most used packet switching technology that ensures QoS for real time applications with efficient use of network resources.VPN is used to connect different sites which belong to the same corporation to work as a single site. Enterprise customers moved to service providers that offer MPLS/VPN and the main reason for this shifting is the capability of MPLS/VPN to provide built-in security features and any-to-any connectivity.WiMAX is an emerging broadband wireless technology that is providing last-mile solutions with efficient QoS methods and is claimed as an alternative broadband rather than cable and Digital Subscriber Line (DSL).Real time applications need special QoS requirements; delay,throughput, and jitter. Powerful scheduling algorithms are essential for satisfying these requirements. In this thesis, QoS performance evaluation is presented based on three scheduling algorithms over MPLS/VPN/WiMAX networks. The used scheduling algorithms are Priority Queuing (PQ),Weighted Fair Queuing (WFQ), and Modified Weighted Round Robin(MWRR). We used the delay, throughput, and jitter as performance metrics to discuss the effect of each scheduling algorithm in satisfying the requirements of VoIP and video conferencing. The Opnet simulator is used in all studies.Simulation results reveal that PQ algorithm outperforms the other algorithms in VoIP. However, Weighted Fair Queuing WFQ exceeds the others in video conferencing application.