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Please use this identifier to cite or link to this item: http://hdl.handle.net/1812/901

Title: Using ACK reply to improve performance of dynamic source routing protocol for mobile ad hoc networks
Authors: Qi, Han
Keywords: Mobile Ad Hoc networks
Routing protocol
Dynamic Source Routing
Issue Date: Mar-2010
Publisher: University of Malaya
Abstract: This thesis reports on the research to develop of a routing protocol to solve the problem of connection establishment in Mobile Ad Hoc networks. As an On-Demand routing protocol, Dynamic Source Routing (DSR) protocol establishes routes only when the source node is going to send data packets to a destination node. This saves a lot of resources, power supply and bandwidth while maintaining stability in routing in a network where the topology frequently changes. In the DSR protocol, a backup route will be initiated to transfer data (in route cache) when the initial route is broken. However, a backup route affects the overall network performance such as end-to-end delay, etc. To solve this problem, the method developed in this research is used to reroute the data traffic and improve the performance of DSR protocol by using ACK reply path as a backup route whenever there is a route failure. The proposed method, called Modified DSR protocol (MDSR), is developed by modifying the DSR protocol. The method creates new flags in the routing message, so that as long as the source node can still receive ACK reply from the destination node when an original route is broken, it uses the forwarding path of ACK as a backup route to transfer the rest of the data packets. MDSR also incorporates features of the TCP-BuS scheme to solve unnecessary resending of lost data packets. The MDSR protocol was implemented in a simulated Ad Hoc network using Network Simulator 2 (NS2). The simulation results show that compared to the original DSR, the end-to-end delay, using MDSR protocol, was reduced from 18.3ms to 13.9ms, and packet delivery ratio improved from 97.8% to 98.4%.
Description: Dissertation (M.C.S.) -- Faculty of Computer Science & Information Technology, University of Malaya, 2010
URI: http://dspace.fsktm.um.edu.my/handle/1812/901
Appears in Collections:Masters Dissertations: Computer Science

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