Date of Award

12-2006

Degree Type

Thesis

Degree Name

M.S.

Degree Program

Computer Science

Department

Computer Science

Major Professor

Deng, Jing

Second Advisor

Tu, Shengru

Third Advisor

Depano, Adlai

Abstract

The Request-To-Send (RTS)/Clear-To-Send (CTS) mechanism is used to combat Hidden/Exposed node problems in Mobile Ad Hoc Networks (MANETs). The popular implementation of the RTS/CTS mechanism may lead to virtual blocking of the wireless medium. Problem arises if a malicious node randomly sends out a large number of spurious CTS frames in order to falsely block regular nodes in its neighborhood. Such an attack is termed as spurious CTS attack. In this thesis, we investigate the effects of such spurious CTS attacks and propose a solution to mitigate the problem. Our proposed solution, Carrier Sensing based Deferral (CSD) mechanism, asks nodes to perform carrier sensing in their deferral state. Therefore, when deferring nodes do not sense any carrier (of data packet transmission) after CTS packets, the CTS packet will be treated as spurious and they will not defer further. Simulation results are presented in the thesis.

Rights

The University of New Orleans and its agents retain the non-exclusive license to archive and make accessible this dissertation or thesis in whole or in part in all forms of media, now or hereafter known. The author retains all other ownership rights to the copyright of the thesis or dissertation.

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