Performance Based Routing Protocol Mechanism for Wireless Ad-hoc Network

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Vinod Mahor
Anil Fatehpuria


The use of TCP for several Internet applications today mandates its adoption as a transport layer protocol in heterogeneous networks
comprised of both wire-line and wireless links. However, the congestion control mechanisms of TCP cause the losses over the wireless channel
to be perceived as an indication of congestion and the data transfer rate of TCP to be adversely impacted. The solutions that have been proposed
over the years to troubleshoot the problem have their share of drawbacks. The use of adaptive link layer techniques in emerging wireless
technologies opens up the possibility of a cross-layer approach for TCP performance enhancement. In our work we outline an optimization
framework based on the congestion control dynamics of a bulk-transfer TCP flow. By identifying TCP window evolution patterns in the
dynamics, we develop a generic optimization framework for throughput enhancement via adaptive link layer measures. We demonstrate the
performance increase on application of the optimization approach. We next investigate a cross-layer multi-hop routing approach based on link
connectivity assessment in mobile ad-hoc networks. We suggest a framework for proactive enhancements to the Optimized Link State Routing
(OLSR) protocol and implement the proposed measures within the protocol format. We finally address efficient packet scheduling for multipleinterface
wireless systems. The demand for bandwidth aggregation in such systems has resulted in a pronounced need for appropriate packet
scheduling measures. In this thesis we can achieve reduction in buffer lengths, packet delays, multi-user interference, and device energy



Keywords- Wireless Network, OLSR Protocol, TCP.


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