U-MAC: a proactive and adaptive UWB medium access control protocol

Raja Jurdak*, Pierre Baldi, Cristina Videira Lopes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)551-566
Number of pages16
JournalWireless Communications and Mobile Computing
Issue number5
Publication statusPublished - Aug 2005
Externally publishedYes


  • Ad hoc networks
  • Medium access control
  • Proactive protocols
  • Quality of service
  • Sensor networks
  • Ultra wide band


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