ShanNatarajan - Network Management in a Heterogeneous and...

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Network Management in a Heterogeneous and Sparsely Populated Mobile Ad Hoc Network By Shanmugasundaram Natarajan Submitted to Dr. Dan Marinescu School of Electrical Engineering and Computer Science University of Central Florida Orlando FL
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1. INTRODUCTION Mobile ad hoc network consists of wireless mobile hosts that communicate with each other, in the absence of a fixed infrastructure. These networks have no fixed routers. All the nodes are capable of movement and can be connected dynamically in an arbitrary manner. Nodes of these networks act as routers, which discover and maintain routes to other nodes in the network. Due to the movement of the hosts, the network’s wireless topology may change rapidly and unpredictably. Due to transmission distance limitations, the nodes may not be able to communicate with each other directly. Hence a multihop scenario occurs, and several hosts may need to relay a packet before it reaches the destination. Mobile ad hoc networks commonly referred to as MANETs have applications in situations like battlefields, rescue operations, festival grounds, assemblies or major disaster areas where users need to deploy networks immediately without the benefit of base stations or fixed network infrastructures. Here we are concerned with a special class of ad hoc networks, those where communicating entities range from primitive devices with a very limited communication range, power, and processing capabilities to considerably more sophisticated devices with a far greater range and virtually unlimited power as well as computing capabilities. 1.1Characteristics of MANETs Dynamic topologies: Nodes are free to move arbitrarily. Thus the network topology, which is typically multihop, may change rapidly at unpredictable times, and may consist of both bi- directional and unidirectional links. Bandwidth Constrained: Wireless links have significantly lower capacity than the hardwired links. Often the realized throughput is much less than the medium’s maximum transmission rate. Usually in this scenario congestion is a norm than exception. Energy Constrained Operation: Some or all of the nodes in a MANET may rely on batteries or other exhaustible means for their energy. For these systems the most important design criteria may be energy conservation. Limited Physical Security: Mobile wireless networks are generally more prone to physical security threats than the fixed cable networks. The increased possibility of eavesdropping, spoofing and denial of service attacks should be considered. 1.2 Classification of MANETs MANETs can be typically classified into Sparsely populated and Densely populated Each of these types has specific characteristics. Sparsely populated MANETs, due to lesser number of nodes have less competition to the available limited resources. But the lesser number of nodes may result in the partition of the network and some of the nodes may become unreachable due to host mobility. In a densely populated network, on the other hand there is a stiff competition to the
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ShanNatarajan - Network Management in a Heterogeneous and...

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