A Multiple Path-Metrics Based Routing Protocol for Providing Differentiated QoS to Various Data Tracs in Mobile Ad hoc Network
아흐메드 엠디 소헬
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Mobile ad hoc networks (MANETs) have achieved much popularity due to their numerous advantages over wired communication such as mobility, scalabil-ity and cost eectiveness. These networks are self-organizing, self-conguring and instantly deployable in response to the application needs. However, along with the exibility, a lot of challenges arise such as low quality of transmission media, the scarcity of network resources and lack of ecient routing protocol. Therefore, providing sucient Quality of Service (QoS) over MANET is a challenging task. Since real-time communications such as video telephony, video game and voice over IP have gain much popularity, MANETs might be an increasing motivation on the introduction of Quality of Service (QoS) in such networks. In this thesis, we study the challenges of supporting QoS of various multime-dia tracs in mobile ad hoc networks. Various multimedia applications need to meet several service requirements. To meet the application requirements, ecient protocol design and harmonious cooperation among dierent layers are essential. This thesis describes this goal by proposing an ecient protocol architecture that supports the collaborative interactions among dierent layers and increase the QoS performance. We begin with conducting numerous experiments to observe the characteris-tics and motivating points of ad hoc networks for high speed multimedia trac. Our aim is to gain the major challenges and insight into the performance of the ad hoc networks. In order to support sucient QoS in network layer, we propose an ecient routing protocol for providing dierentiated services of various mul-timedia tracs based upon multiple path metrics. The proposed protocol allows ne tuning of priorities of path-metrics to support dierentiated QoS by using a weighted cost function. The overall cost of a path is estimated by considering multiple-metrics such as the available bandwidth, enhanced ETX (expected trans-mission count) and the end-to-end path length. Finally, we study the performances of our protocol and compare with other ad hoc routing protocols. Our proposed solution considerably improves in terms of throughput and end-to-end delay.