This article studies the performance of a wireless sensor network with cognitive radio capabilities to gather information\nabout structural health monitoring of buildings in case of seismic activity. Since the use of the local area network is intensive\nin office and home environments, we propose the use of empty cellular channels (primary system). As such, the\nstructural health monitoring does not degrade the local communications. Thus, the wireless sensor network for structural\nhealth monitoring acts as secondary network. Two discrete-time analytical approaches are proposed and developed\nto evaluate the system performance in terms of both the average packet delay and average energy consumption. The first\none is an approximation suitable for the case when the time slot duration is small relative to the mean call inter-arrival\ntime. The second model is accurate for any time slot duration and inter-arrival times
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