A performance modeling of WiMedia UWB MAC

The WiMedia Ultra-Wide Band (UWB) specifications include physical layer and distributed Medium Access Control (MAC) layer. Physical layer offers a range of coded data rates from 53.3 Mb/s to 480 Mb/s. WiMedia MAC consists of Beacon period (BP), Distributed Reservation Protocol (DRP) and Prioritized Contention Access (PCA). DRP allows access to the medium through reservation, while PCA provides access to the bandwidth not utilized by DRP through contention. In this paper, we present an integrated performance analysis of the DRP and PCA schemes which includes the multi-rate transmission at the physical layer. We assume DRP traffic with several classes and PCA traffic with multi-priority levels. We determine the call blocking probabilities for DRP classes of traffic, throughput and mean packet delay for PCA traffic and bandwidth utilization of the system. The numerical results show that under heavy traffic throughput of low priority traffic drops and its delay increases sharply.