The Terminal Node Controlled Routing Protocol for Mobile Ad Hoc Networks

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Title: The Terminal Node Controlled Routing Protocol for Mobile Ad Hoc Networks
Author: Raghavan, Sudarshan Narasimha
Advisors: Dr. Rudra Dutta, Committee Member
Dr. Arne A. Nilsson, Committee Chair
Dr. Mihail Sichitiu, Committee Member
Abstract: The purpose of the research has been to study the influence of unidirectional links on routing in mobile ad hoc networks (MANET) and to develop a new protocol for routing in ad hoc networks with unidirectional links. In this thesis, we propose and discuss a Terminal Node Controlled Routing Protocol (TNCR) for mobile ad hoc networks. TNCR is based on the concept of source routing and provides optimal routes on an on-demand basis by utilizing unidirectional links in the network. Unlike existing protocols, TNCR uses an end-to-end probing technique for discovering path failures. Propagation of stale route information is accomplished using a source initiated token passing mechanism. A source tagging technique is used for caching routes to enable nodes to learn new routes and flush stale routes from the cache. The protocol uses a reverse caching technique to reduce the number of network-wide broadcasts required for route establishment and a broadcast limiting mechanism to reduce the overhead due to broadcast messages. In order to decrease the per packet overhead due to source routing, TNCR employs a route stripping technique for forwarding unicast packets. The protocol avoids the use of link layer acknowledgements and the intervention of intermediate nodes in route maintenance. Thus it provides a highly efficient, link layer independent framework for routing in ad hoc networks in the presence of unidirectional links. This framework is best suited for ad hoc networks composed of heterogeneous mobile nodes with varying transmission ranges. In addition, the protocol can be configured to operate in a bi-directional mode in which it uses a path reversal mechanism for further optimization and overhead reduction. This makes the protocol well suited for all network topologies. We evaluate the performance of the proposed protocol through detailed simulation, measurements and comparison with existing protocols.
Date: 2003-04-20
Degree: MS
Discipline: Computer Science

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