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Z-MAC: A Hybrid MAC for Wireless Sensor Networks

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5 Author(s)
Injong Rhee ; Comput. Sci. Dept., North Carolina State Univ., Raleigh, NC ; Warrier, A. ; Aia, M. ; Jeongki Min
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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 low latency 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 time-varying channel conditions; in the worst case, its performance always falls back to that of CSMA. Z-MAC is implemented in TinyOS.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:16 ,  Issue: 3 )