Abstract
T he UWB (Ultra Wide Band) technology can play an effective role in FCS ( Fieldbus Control System ). But the channel acquisition time of UWB is high , and a lot of packets are short in FCS. So the efficiency of FCS based on UWB will significantly reduce. In this paper, a CSMA/CA protocol with D-UF (Dynamic Length Mechanism for Unite Frame) is proposed. The characteristics of U W B and size of data packets in FCS are take n into account in the CSMA/CA protocol with D-UF . First, the characteristics of UWB and FCS are discuss ed, and the slot utilization of CSMA/CA protocol is analyzed in different FCS. Finally, t he packet assembly policy is designed. A t the same time , t he performance of the CSMA/CA protocol with D-UF is evaluated in FCS based on UWB by modeling and simulation. Simulation results show that the CSMA/CA protocol with D-UF is effective to increase slot utilization , and improve t hroughput , and reduce average delay i n the FCS based on UWB. It is useful to engineer for designing the FCS based on UWB.
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