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The authors address a unique security threat that arises due to channel fragmentation (or aggregation or bonding) in Dynamic Spectrum Access (DSA) based IEEE 802.22 networks. Typically, channel fragmentation, aggregation and bonding have been studied in the literature as a means to enhance the spectrum utilization. However, the loss of orthogonality between the spectrum bands due to channel fragmentation, aggregation or bonding can be exploited by malicious attackers to cause a cognitive service disruption. They present an analysis of such a threat. They determine the optimal transmit powers a malicious attacker transmits on each fragment, so as to create maximum service disruption.
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