Evaluation of Various Routing Protocols for Mobile Ad-Hoc Networks (Manets
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Date
2004-09
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Addis Ababa University
Abstract
Mobile Ad-hoc NETwork (MANET), which is a concept of mobile
communication without a fixed communication infrastructure, is one of the
current emerging technologies gaining much attention from both researchers and
users. Because there is no as such a fixed responsible device router, each
computing node is to act as a router and should be willing to forward other’s
packets.
Routing in mobile computing is a difficult task as we have a very dynamic
network topology. Another problem is, the nodes in ad-hoc network are usually
laptops and personal digital assistants and are often very limited in resources
such as CPU capacity, storage capacity, battery power and bandwidth. This
means, any routing protocol running on a mobile node should try to minimize
routing or control packets and also be reactive.
A research work group established by IETF, has set a number of requirements to
be met by an ad-hoc routing protocol. According to these requirements, a
number of routing protocols have been proposed broadly into two main
categories, proactive and reactive.
In this thesis, a detailed discussion of routing protocols from both proactive and
reactive group is presented followed by simulation work using a discrete event
Network Simulator called NS-2. Because these groups of routing protocols fail
to satisfy all the requirements of MANET under all conditions such as high
mobility, big network size and large number of traffic sources, a new scheme of
hybrid routing protocol is proposed. This new routing protocol, called ZRP, is to
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take advantages from both proactive and reactive group of protocols. It
alleviates scalability problem of other routing protocols by classifying the
network into manageable sizes called zones.
ZRP combines two different routing schemes in one protocol. IntrAzone routing
uses a proactive protocol to maintain up-to-date routing information to all nodes
within its routing zone. By contrast intErzone route discovery is based on a
reactive route request and reply scheme. Simulation results of this thesis work
shows that ZRP performs well under all conditions especially when we have
large network size.
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Networks