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Performance Analysis and Research of Quality of Service for VoIP over WLAN

Author: ZhangWei
Tutor: ZuoLiLi
School: Liaoning University of Technology
Course: Communication and Information System
Keywords: VoIP WLAN QoS EDCA NS-2network simulation admission control
CLC: TN925.93
Type: Master's thesis
Year: 2014
Downloads: 16
Quote: 0
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Abstract


Recently, Wireless Local Area Networks is applied and disposed in large scale becauseof its easy disposition, flexibility and so on. The applications on WLAN range from standardInternet services to new fashioned real-time services (VoIP). VoIP could carry voice, video,data and other services, which is in line with the development trend of Internet multi-serviceand with lower expense in communication service. Therefore VoWLAN emerged. With thefurther development, VoWLAN (VoIP over Wireless LAN) will achieve convergence withother services inevitably, which would bring forward a higher requirement for networkperformance. The difference of service emphases on the whole converged network wouldaffect the measurement of network status.According to the QoS problems exist in VoWLAN, and under the premise of analyzingthe QoS guarantee, classical improvement schemes: EDCA (Enhanced Distributed ChannelAccess) and AEDCF (Adaptive EDCF) mechanism for VoWLAN QoS are studied in thispaper, and the existing improvement mechanism features are classified. On this basis, a novelservice-oriented QoS guarantee mechanism based on access category traffic is proposed inthis paper, which draw on the slot utilization factor to evaluate channel loading level andadjust contention window size adaptively. Combined with the concept of backoffdiscontinuation rate and in view of the backoff value of non-real-time traffic chosen randomly,in order to achieve further expansion of EDCA function, a situation of the lower limit ofnon-zero value associated with network load is set. In addition, the feasibility and efficiencyof SA-EDCA algorithm are proved by NS-2. The simulation results show that this algorithmcan improve the performance and QoS of the WLAN.At last, the up-to-date admission control algorithms in IEEE802.1le EDCA are studiedand analyzed in this paper. Then an admission control scheme based on CW is proposed, andan admission control model with QoS based on the admission control scheme is gave in thispaper.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications > Wireless subscriber loop ( Radio Access Network)
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