Quality of Service for Voice IP in Wireless Local Area... Wadheh Hafidh AL Manthari Abstract

Electrical and Computer Engineering Department-College of Engineering-Sultan Qaboos University
Quality of Service for Voice IP in Wireless Local Area Network
Wadheh Hafidh AL Manthari
Applying voice communication in Wireless Local Area network (WLAN) is a challenging task.
This is because of the strict requirement of voice communication in term of delay and bandwidth.
In order to fulfill these requirements, IEEE (Institute of Electrical and Electronic Engineers) has
developed the 802.1 l e standard to address the Quality of Service (QoS) requirements in WLAN.
This thesis utilizes OPNET modeler to program and simulate the Enhanced Distributed Channel
Access (EDCA); which is the traffic priority technique of the 802.lle IEEE standard. Four
priority levels were set for the different traffic types with the voice traffic having the highest
priority. Several scenarios of network setups were simulated in order to evaluate the performance
of the newly programmed QoS under different conditions. Assigning the highest priority to the
voice traffic allowed the voice traffic to have the smallest media access delay, lowest number of
backoff slots and retransmission attempts while maintaining high throughput. These results
helped utilizing the WLAN for voice communication.
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