Jamming attacks can severely interfere with the normal operation of wireless networks and, consequently, mechanisms are needed that can cope with jamming attacks. No single measurement is sufficient for reliably classifying the presence of a jammer is an important observation. Various detection schemes are developed based on measurements which can remove ambiguity when detecting a jammer. But the major drawback of the existing approaches is that the complete processing and decision making while detecting the jammer is done at the node level where nodes are resource-starved and so nodes may not be able to communicate with others during jamming. In this paper, we propose an anti-jamming mechanism where detection is done network level means at base station. Here, the base station computes a Jamming Index (JI) for each node and asserts its validity and then decide the lower cut-off value of JI to conclude that all nodes whose JIs are greater than the lower cut-off value are ‘Jammed’ while the others are ‘Not Jammed’. Our proposed mechanism is robust and economical.
