Browsing by Author "Mosisa, Ebsa"

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    Cooperative Communication in Mobile Ad-hoc Networks Using DSR Protocol
    (AAU, 2016-05) Mosisa, Ebsa; Murad, Ridwan (PhD)
    A mobile Ad-hoc network (MANET) is consists of mobile platforms which are simply referred to as "nodes" which are free to move about arbitrarily without requiring centralized administration or fixed network infrastructure. The nodes may be in or on airplanes, ships, trucks, cars, perhaps even on people or very small devices, and there may be multiple hosts per router. Through cooperatively forwarding packets for each other, nodes in mobile Ad-hoc networks can communicate with other nodes out of their direct transmission ranges. MANET nodes are equipped with wireless transmitters and receivers using antennas which may be omnidirectional (broadcast), highly-directional (point-to-point), possibly steerable, or some combination thereof. In many situations, such as military or emergency applications, nodes in an Ad-hoc network belong to the same authority and pursue the common goals. Under such circumstances, fully cooperative behavior, such as unconditionally forwarding packets for each other, can be assumed. We refer to such Ad-hoc networks as cooperative Ad-hoc networks. The common theme of most research in this area is to optimize physical layer performance measures without considering in much detail how cooperation interacts with higher layers and improves network performance measures. Because these issues are important for enabling cooperative communications to practice in real-world networks, especially for the increasingly important class of mobile Ad-hoc networks. Cooperative routing technology can efficiently improve the performance of the network by initiatively selecting cooperative nodes to forward the data. In this research, cooperative routing algorithms is proposed and implemented in mobile Ad-hoc networks and the performance of the proposed cooperative Ad-hoc algorithms are compared with noncooperative Ad-hoc dynamic-source-routing (DSR) protocol using the network simulator (NS2).