MCAST: Mobility-aware Channel-Availability based Channel Selection Technique

摘要

A key issue in cognitive radio networks is the designudof a channel selection technique that guarantees to utilize theudhighest available channel in presence of the dynamic activityudof primary users. Usually, the channel selection techniques thatudoperate in this kind of network are based on the channelavailabilityudprobability. In the static primary user’s scenario,udthis probability can be a priori known or simply estimated fromudthe channel occupancy history. However, in the mobile primaryuduser’s scenario, this probability dynamically varies in time dueudto the changes of the primary user’s position. In order to exploitudthe dynamic variation of the channel availability, in this paperudwe design a novel Mobility-aware Channel-Availability basedudchannel Selection Technique (MCAST) that ensures to selectudthe channel with the highest channel availability probability inuda given temporal interval. The simulation results highlight theudbenefits of the proposed technique in presence of primary user’sudmobility. Moreover, we evaluate the effectiveness of MCAST inuda scenario of practical interest by adopting this technique in audrecently proposed routing metric designed for this network.