scholarly journals MAC-Layer QoS Evaluation Metrics for IEEE 802.11e-EDCF Protocol over Nodes' Mobility Constraints

10.5772/38196 ◽  
2012 ◽  
Author(s):  
Khaled Dridi ◽  
Boubaker Daachi ◽  
Karim Djouani
Keyword(s):  
Evaluation Metrics ◽  
Ieee 802.11E ◽  
Mac Layer ◽  
Qos Evaluation

Simulation Implementation and Performance Analysis of IEEE 802.11e EDCA Protocol

2011 ◽  
Vol 58-60 ◽  
pp. 1429-1434
Author(s):  
Jin Hua Zhou ◽  
Lei Lei ◽  
Wei Kang Liu ◽  
Li Bin Tao
Keyword(s):  
Performance Analysis ◽  
Ad Hoc ◽  
Multimedia Applications ◽  
Ieee 802.11E ◽  
Mac Layer ◽  
Excellent Performance ◽  
Qos Guarantee ◽  
Mobile Ad Hoc ◽  
And Performance ◽  
Hoc Networks

In this paper, we focus on IEEE 802.11e enhanced distributed channel access (EDCA) protocol, which can provide QoS guarantee for multimedia applications in mobile ad hoc networks. First, we briefly explain the concept of EDCA protocol. Then we implement EDCA protocol in GloMoSim via configuring special contention parameters for multimedia applications and introducing a virtual collision disposal mechanism in the MAC layer. In the end, we provide performance analysis for EDCA protocol through plentiful simulations. The simulation results show an excellent performance of the EDCA protocol we proposed.

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 A Cross Video-MAC Layer Approach for Generating Adaptive FMO Map

1970 ◽  
Vol 6 (1) ◽  
pp. 58-63
Author(s):  
Tien Huu Vu ◽  
Supavadee Aramvith
Keyword(s):  
Video Transmission ◽  
Video Quality ◽  
Arrival Rate ◽  
Ieee 802.11E ◽  
Cross Layer ◽  
Cross Layer Design ◽  
Mac Layer ◽  
Medium Access ◽  
Error Resiliency ◽  
Map Generation

Recent researches in video transmission over heterogeneous networks move toward cross-layer design to realize the optimal video quality. In this work, we investigate the cross layer approach between H.264 video coding layer and IEEE 802.11e Medium Access Control (MAC) layer on the issues of how to improve error resiliency of H.264 video using Flexible Macroblock Ordering (FMO), and how to reduce packet dropping rate at MAC layer. We propose an adaptive FMO map generation to separate high and low important macroblocks to different priority queues based on the overflow state of MAC layer queues. The arrival rate of packets to queues is thus changed to reduce the queue overflow and to decrease of the packet droppingrates at queues. Experimental results show that using the proposed scheme can reduce the packet drop rate at the queues resulting in the reduction of packet loss rate and the improvement of the average PSNR.

scholarly journals Queuing Analysis for IEEE 802.11e Networks in Non-Saturation Environments

10.5772/50911 ◽  
2012 ◽  
Vol 9 (1) ◽  
pp. 12 ◽  
Author(s):  
Eui-Jik Kim ◽  
Sungkwan Youm ◽  
Hyo Hyun Choi
Keyword(s):  
Probability Distribution ◽  
Service Time ◽  
Mac Protocol ◽  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Distribution Model ◽  
Ieee 802.11E ◽  
Mac Layer ◽  
Traffic Loads

This paper presents an analytical model for the performance evaluation of an IEEE 802.11e network in non-saturation environments. We first characterize the probability distribution of the MAC layer packet service time. Based on the probability distribution model of the MAC layer packet service time, we then study the queuing performance of the wireless local area networks (WLANs) at different traffic loads based on the IEEE 802.11e MAC protocol. The numerical results show that we can choose a feasible number and bandwidth of the node which determines the system performance that a user demands.

scholarly journals A Comparison Performance Analysis of QoS WLANs: Approaches with Enhanced Features

2007 ◽  
Vol 2007 ◽  
pp. 1-13 ◽  
Author(s):  
Ioannis Papapanagiotou ◽  
Georgios S. Paschos ◽  
Michael Devetsikiotis
Keyword(s):  
Performance Analysis ◽  
Complexity Theory ◽  
Queuing Theory ◽  
Ieee 802.11E ◽  
Complex Frequency ◽  
The Novel ◽  
Scientific Interest ◽  
Mac Layer ◽  
Distance Method ◽  
First Order

The main contribution of this work is to compare and enhance known methods for performance analysis of the IEEE 802.11e MAC layer, such as the use of Markov chains, queuing theory, and probabilistic analysis. It is the first paper that bases its outputs upon comparison of metrics such as complexity, flexibility, and accuracy, leading to the novel use of a metamodeling comparison. For the analysis, complexity theory and theL-square distance method for accuracy are used. In addition, the proposed analyses carry by themselves scientific interest, because they are extended enhancements with the latest EDCA parameters. A form of the PMF of the MAC delay and first-order moments are found using the PGF complex frequency domain function. The analyses incorporate a Gaussian erroneous channel in order to reflect the real conditions of the MAC layer.

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