Computer Engineering

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Browsing Computer Engineering by Author "Abera, Dawit"

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    PACL-SDP: An efficient Cross-Layered Service Discovery Architecture for Mobile Ad Hoc Networks
    (Addis Ababa University, 2010-07) Abera, Dawit; Nouh, Sayed (Professor)
    Efficient service discovery is a key for any successful network communication. The necessity is even emphasized for mobile ad hoc networks that do not rely on any infrastructure to maintain connectivity. The process of resource discovery and the corresponding service acquisition should be carried out with optimum consumption of energy and within a reasonable response time period to keep the life of the battery operated devices. In this thesis work a new service discovery architecture is proposed following the guidelines of Service Location Protocol standard from IETF��. The new solution is a cross-layered protocol based on a distributed directory design that considers physical proximity of devices for service discovery. The new proposal has been compared with a traditional application layer based service discovery protocol with the same distributed directory architecture that was designed from the same standard, SLP. Both protocols were implemented in NS2 for comparison. The results of the findings are compelling in that the cross-layered approach yields a much better performance for various evaluation metrics used. Under the various scenarios considered, the new cross-layered protocol has an average energy saving ranging from 10.24 % to 13.73%. The observed packet delivery ratio shows an average increase from 3.49% to 5.76% for the recommended mobility models. The service availability has also increased on average from 8.14% to 67.47% for those mobility models. In addition, the average raise of throughput is observed in the range of 2.64% to 8.91%.