Fairness models to improve the quality of service in ad-hoc wireless networks

Abstract : This thesis aims to enhance the quality of service (QoS) in wireless ad-hoc networks with fairness. The QoS in wireless ad-hoc networks is referred to the standard IEEE802.11e (EDCA) to guarantee the high priority traffic (i.e. Multimedia and Real-time traffics). Further, the QoS is managed in each station by differentiating the packets in categories to be queued depending on their priorities. Then, these packets will access the channel in different waiting time. However, EDCA cannot control the heavy traffic caused by the ill-behaved users. So, if the traffic is regulated with fairness, it could resolve some of networks' problems like the congestion and starvation. These problems degrade the QoS guarantee, because the ill-behaved sources consume the majority of the allocated resources. That leads to some of source nodes suffer from the lack of bandwidth and unfairness. So, without a proper control mechanism, it could decrease the QoS guarantees. Therefore, we propose (FQ-EDCA) that is a Fairness Queuing model for EDCA. It enhances the QoS by implementing scheduling techniques and improving the architecture of EDCA. Thereby, the traffic is regulated between the source nodes by separating the ill-behaved sources. Thus, the resources are allocated fairly between all the source nodes. Further, a fairness model (F-EDCA) is proposed to differentiate between two source nodes. One of them is routing packets of its neighbors and the other is only sending its packets. Both of these models are implemented and evaluated with EDCA. As a consequence, each of them enhances EDCA, could allocate the resources with fairness in different conditions and increase the QoS guarantee
Document type :
Engineering Sciences [physics]. Ecole Centrale de Lille, 2009. English. <NNT : 2009ECLI0024>

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Submitted on : Thursday, March 24, 2011 - 3:14:07 PM
Last modification on : Monday, April 18, 2011 - 10:24:26 AM




  • HAL Id : tel-00579655, version 1



Hanal Abu Zanat. Fairness models to improve the quality of service in ad-hoc wireless networks. Engineering Sciences [physics]. Ecole Centrale de Lille, 2009. English. <NNT : 2009ECLI0024>. <tel-00579655>




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