الفهرس 
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Abstract
Today, applications of real-time multimedia require heavily use of networks resources in which it affects the network performance. So, Quality of Service (QoS) of such networks is highly needed to be investigated and improved. VoWLAN is a VoIP system over Wi-Fi which offers a significantly extended operational range. In this thesis, we analyse the performance of Deficit Round Robin (DRR), Fair Queue (FQ), DropTail (FIFO), Stochastic Fair Queue (SFQ), and Random Early Discard (RED) queuing management schemes for VoIP over SCTP 802.11n in Wi-Fi n using NS2 network simulator based on QoS (throughput, delay, and jitter) to obtain a better call quality for the users. In the used simulator, we generate SCTP VoIP traffic over Wi-Fi n and measure the impact of each node with applying different queue management schemes. The results of our simulation showed that the DROP Tail and RED queuing schemes performed better than other queue management schemes, in which both give high throughput, less delay and less jitter.