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Z-MAC: a Hybrid MAC for Wireless Sensor Networks

By Injong Rhee, Ajit Warrier, Mahesh Aia and Jeongki Min


This paper presents the design, implementation and performance evaluation of a hybrid MAC protocol, called Z-MAC, for wireless sensor networks that combines the strengths of TDMA and CSMA while offsetting their weaknesses. Like CSMA, Z-MAC achieves high channel utilization and lowlatency under low contention and like TDMA, achieves high channel utilization under high contention and reduces collision among two-hop neighbors at a low cost. A distinctive feature of Z-MAC is that its performance is robust to synchronization errors, slot assignment failures and timevarying channel conditions; in the worst case, its performance always falls back to that of CSMA. Z-MAC is implemented in TinyOS

Topics: General Terms, Algorithms, Design, Performance Keywords, MAC, CSMA, TDMA, wireless sensor networks
Publisher: ACM Press
Year: 2005
OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
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