Date of Award


Degree Type


Degree Name


Degree Program

Computer Science


Computer Science

Major Professor

Deng, Jing

Second Advisor

Tu, Shengru

Third Advisor

Depano, Adlai


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.


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