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In this paper, the authors propose an analytical model for the Distributed Reservation Protocol (DRP), which is defined in the WiMedia specification for Ultra-WideBand (UWB)-based Wireless Personal Area Networks (WPANs). They model the tagged user as a discrete-time queue with vacations, which captures the joint behavior of a queue length variation and a time-varying UWB channel due to shadowing under a given reservation pattern. Furthermore, they consider two reservation methods: hard reservation and soft reservation. With the hard reservation, a time slot is exclusively used by the owner, whereas the unused time slots can be accessed by other users using the soft reservation.
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