scholarly journals Performance evaluation for IEEE 802.11e enhanced distributed coordination function

2004 ◽  
Vol 4 (6) ◽  
pp. 639-653 ◽  
Author(s):  
Yunli Chen ◽  
Qing-An Zeng ◽  
Dharma P. Agrawal
Keyword(s):  
Performance Evaluation ◽  
Ieee 802.11E ◽  
Distributed Coordination ◽  
Distributed Coordination Function ◽  
Coordination Function

scholarly journals A Novel Prioritization Scheme to Improve QoS in IEEE 802.11e Networks

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Navid Tadayon ◽  
Saadan Zokaei ◽  
Elaheh Askari
Keyword(s):  
Ieee 802.11E ◽  
Maintenance Cost ◽  
Distributed Coordination ◽  
Mac Layer ◽  
Distributed Coordination Function ◽  
Wireless Medium ◽  
802.11 Wlan ◽  
Well Differentiated ◽  
Coordination Function ◽  
Prioritization Scheme

IEEE 802.11 WLAN utilizes a distributed function at its MAC layer, namely, DCF to access the wireless medium. Due to its distributed nature, DCF is able to guarantee working stability in a wireless medium while maintaining the assembling and maintenance cost in a low level. However, DCF is inefficient in dealing with real-time traffics due to its incapability on providing QoS. IEEE 802.11e was introduced as a supplementary standard to cope with this problem. This standard introduces an Enhanced Distributed Coordination Function (EDCF) that works based on diff-Serve model and can serve multiple classes of traffics (by using different prioritizations schemes). With the emergence of new time-sensitive applications, EDCF has proved to be yet inefficient in dealing with these kinds of traffics because it could not provide network with well-differentiated QoS. In this study, we propose a novel prioritization scheme to improve QoS level in IEEE 802.11e network. In this scheme, we replace Uniform PDF with Gamma PDF, which has salient differentiating properties. We investigate the suitability and superiority of this scheme on furnishing network with well-differentiated QoS using probabilistic analysis. We strengthen our claims by extensive simulation runs.

scholarly journals Latency and Jitter Analysis for IEEE 802.11e Wireless LANs

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Sungkwan Youm ◽  
Eui-Jik Kim
Keyword(s):  
Local Area ◽  
Ieee 802.11E ◽  
Distributed Coordination ◽  
Mac Layer ◽  
Medium Access ◽  
Distributed Coordination Function ◽  
Packet Latency ◽  
Coordination Function ◽  
The Voice

This paper presents a numerical analysis of latency and jitter for IEEE 802.11e wireless local area networks (WLANs) in a saturation condition, by using a Markov model. We use this model to explicate how the enhanced distributed coordination function (EDCF) differentiates classes of service and to characterize the probability distribution of the medium access control (MAC) layer packet latency and jitter, on which the quality of the voice over Internet protocol (VoIP) calls is dependent. From the proposed analytic model, we can estimate the available number of nodes determining the system performance, in order to satisfy user demands on the latency and jitter.

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