A MAC protocol for low-rate UWB wireless sensor networks using directional antennas
Computer Networks: The International Journal of Computer and Telecommunications Networking
A joint PHY/MAC cross-layer design for UWB under power control
Computers and Electrical Engineering
Cross-layer QoS-aware communication for ultra wide band wireless multimedia sensor networks
IEEE Journal on Selected Areas in Communications
Performance evaluation of impulse radio ultra wide band wireless sensor networks
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Location-aided medium access control for low data rate UWB wireless sensor networks
Wireless Communications & Mobile Computing
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Ultra wide band (UWB) technology has received increasing recognition in recent years for its potential applications beyond radar technology to communication networks. UWB is a spread spectrum technology that requires careful coordination among communicating nodes to jointly control link power and transmission rates. Here, we present ultra wide band MAC (U-MAC), an adaptive medium access control (MAC) protocol for UWB in which nodes periodically declare their current state, so that neighbors can proactively assign power and rate values for new links locally in order to optimize global network performance. Simulations comparing U-MAC to the reactive approach confirm that U-MAC lowers link setup latency and control overhead, doubles the throughput and adapts better to high network loads. Simulations also reveal that the basic form of U-MAC favors nodes that are closer to the receiver. As a result, we also introduce novel mechanisms that control the radius around a receiver within which nodes can have fair access to it. We show through simulations the effect of the mechanisms on the tradeoff between network throughput and fair access. Copyright © 2005 John Wiley & Sons, Ltd.