Analysis of Jamming effects on IEEE 802.11 Wireless Networks

摘要

IEEE 802.11 wireless transmissions suffer from a big security flaw as they are vulnerable to Denial of Service (DoS) attacks which can degrade severely their performance, especially their achieved throughput. One of the most harmful forms of these attacks is the jamming. In this paper, we provide an analytical model to study the effect of jamming on WLANs. Hence, we implement a physical layer jamming to show the effect at the MAC layer level (i.e. cross-layer jamming). Different jamming scenarios, with different modulation techniques such as Direct Sequence Spread Spectrum (DSSS) and Orthogonal Frequency Division Multiplexing (OFDM), are distinguished in order to evaluate the most accurately possible the effect of jamming on WLANs performance. Our validation model is confirmed by means of simulations under ns-3 simulation tool. We show that low rates (e.g. 1Mbps) are more resistant to jamming than high rates (e.g. 27Mbps). We also show that energy consumption when jamming depends on transmission time rather than other factors. These results allow to derive solutions for jamming.