3 research outputs found
A Pheromone-Aided Multipath QoS Routing Protocol and its Applications in MANETs
In this paper, we present an ant-based multipath QoS routing protocol that utilizes a single link metric combiningmultiple weighted criteria. The metric is applied to the proposed energy efficient multipath algorithm that considers both energy and latency. Energy efficiency is an important issue in mobile ad hoc networks (MANETs) since node energy supplies are stored in batteries. In order to increase the network lifetime it is important to maximize the minimum node energy along a path. As the network topology changes, failures may occur on active routes,resulting in the need for new route discoveries if only singleroutes per flow are maintained. Frequent new route discovery would, however, increase routing overhead and increase mean and peak packet latency. Using multiple routes simultaneously per flow can be a solution to these problems. Also, a special case of the multipath QoS routing protocol that considers throughput is applied to a security context. A compromised node can obstruct network communication by simply dropping packets that are supposed to be forwarded. In our approach, messages aredistributed over multiple paths between source and destination using ant-based QoS routing. In proportion to the throughput of each path, a pheromone-aided routing table is updated and, subsequently, paths that contain malicious nodes are naturally avoided
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Hardware assisted misbehaving nodes detection in mobile ad hoc networks
The mobility feature leads to the proliferation of wireless networks. Among all kindsof wireless networks, the peer-to-peer nature of Mobile Ad hoc Networks (MANET)makes such networks very promising. Unlike traditional wired networks, MANETs donot need infrastructure to work properly. The most commonly used routing protocols formobile ad hoc networks do not take into consideration security, assuming all the mobilenodes will coordinate with each other. Such routing protocols along with the absence ofinfrastructure make MANETs prone to a variety of faults such as packet dropping, packetmisrouting, etc.This dissertation addresses the security issues of MANET by presenting the hardwareassisted misbehaving nodes detection. In such a scheme, the hardware is responsible fordetecting the misbehaving nodes. The detection results are sent to software layer ofmobile nodes. Upon receiving the detection results, the software layer can exclude themisbehaving nodes from the networks.This dissertation presents two hardware detection schemes. Two-timer is a low-costdetection scheme. There are only two timers utilized in the scheme. The two-timerscheme can be used to detect simple packet dropping with good detection performance.The other detection scheme, cache scheme, can detect both packet dropping and packetmisrouting. The cache scheme needs more resource than the two-timer scheme alongwith better detection performance