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Author: search.filters.author.Derhab, AbdelouahidStart date: 2008

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    Special Issue on Interconnections of Wireless Sensor Networks
    (InderScience, 2011-05) Derhab, Abdelouahid; Djenouri, Djamel; Jianguo, Ding
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    SQUIRREL: Self-Organizing Qos-roUting for IntRa-flow Contention in Ad-Hoc wiRELess Networks
    (Springer Berlin Heidelberg, 2008) Derhab, Abdelouahid
    In this paper, we use the self-organizing paradigms presented in [1] to design a new QoS-routing intra-flow contention-based protocol for wireless ad-hoc networks, called SQUIRREL. The admission control component of SQUIRREL, called: Scalable and Accurate Admission control (SAICAC), has two variants: SAICAC-Power and SAICAC-CS. SAICAC-Power estimates channel bandwidth availability through high power transmissions and SAICAC-CS through passive monitoring of the channel. Contrary to the existing intra-flow contention-based protocols, SQUIRREL can ensure all the properties of a self-organizing system and can achieve the best results in terms of of message overhead, delay, and scalability.
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    Low-Cost and Accurate Intra-flow Contention-Based Admission Control for IEEE 802.11 Ad Hoc Networks
    (Springer Berlin Heidelberg, 2008) Derhab, Abdelouahid
    In this paper, we propose a new admission control method for IEEE 802.11 ad hoc networks, called Low-cost and Accurate Admission control (LAAC). The proposed method has two variants: LAAC-Power and LAAC-CS. LAAC-Power estimates channel bandwidth availability through high power transmissions and LAAC-CS through passive monitoring of the channel. Due to the shared nature of the wireless medium, contention occurs among the nodes along a multi-hop path, which leads to intra-flow contention. LAAC accurately estimates the intra-flow contention. In addition, an analytical study demonstrates that LAAC achieves optimal results in terms of overhead and delay compared to the existing intra-flow contention-based admission control methods. LAAC also utilizes two criteria for accepting flows: one during the route request phase and the other during the route reply phase, which helps to reduce message overhead and avoid flooding route requests in hot spots. Simulation results show that LAAC-CS outperforms LAAC-Power in terms of packet delivery ratio, throughput, message overhead, and energy consumption.
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    A Comparison on MANETs’ Service Replication Schemes: Interest versus Topology Prediction
    (Springer, 2010) Derhab, Abdelouahid; Hamdy, Mohamed; König-Ries, Birgitta
    Mobile ad hoc networks (MANETs) are characterized by high dynamics in particular with respect to the formation of network partitions. The presence of unconnected partitions makes the deployed services inaccessible to some network participants. Service replication is employed as an approach to overcome this problem and to ensure higher service availability. Several protocols and algorithms for service replication in MANETs have been proposed. Most of these approaches apply topological analysis (like partitioning prediction) schemes to produce the required replication decisions. One approach, SDP, the Service Distribution Protocol, bases its decisions on analyzing interest in the service, an application layer concept. In this paper, we compare the performance of approaches based on these two criteria. First, we analyze protocols based on topology prediction and choose two typical representatives of this category, namely PSRP and SSRP. We then compare SDP as the only candidate using service interest to these two approaches. This comparison is based on an extensive set of simulation runs which are discussed in detail in the paper.