• PAVITHRAN A
• RAJA A

In wireless network, every node accesses the network in a cooperative manner and randomly delays transmissions to avoid collisions by following a common backoff rule. However, in such a distributed environment without a centralized controller, a malicious node may deliberately choose a smaller backoff timer and selfishly gain an unfair share of the network throughput at the expenses of other normal nodes channel access opportunities. The distributed nature of the CSMA/CA-based wireless protocols allows malicious nodes to deliberately manipulate their backoff parameters and, thus, unfairly gain a large share of the network throughput. This paper designs a real-time backoff misbehavior detector, termed as the fair share detector (FS detector), which exploits the nonparametric cumulative sum (CUSUM) test to quickly find a selfish malicious node without any a priori knowledge of the statistics of the selfish misbehavior. While most of the existing schemes for selfish misbehavior detection depend on heuristic parameter configuration and experimental performance evaluation, the papers develop a Markov chain-based analytical model to systematically study the performance of the FS detector in real-time backoff misbehavior detection. The paper quantitatively computes the system configuration parameters for guaranteed performance in terms of average false positive rate, average detection delay, and missed detection ratio under a detection delay constraint. We present thorough simulation results to confirm the accuracy of the theoretical analysis as well as demonstrate the performance of the developed FS detector. In addition, this paper systematically studies the generic scenario with multiple misbehaving nodes in a multihop wireless network.

Backoff, Fair share detector, Markov chain based Analytical Model, Multihop.

"REAL-TIME MISBEHAVIOR DETECTION IN WIRELESS NETWORKS WITH FALSE POSITIVE RATE REDUCTION ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 3, page no.628-636, March-2019, Available :http://www.jetir.org/papers/JETIR1903C88.pdf

"REAL-TIME MISBEHAVIOR DETECTION IN WIRELESS NETWORKS WITH FALSE POSITIVE RATE REDUCTION ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 3, page no. pp628-636, March-2019, Available at : http://www.jetir.org/papers/JETIR1903C88.pdf