Z-MAC: Performance Evaluation and Enhancements

Abstract Most of the hybrid wireless sensor networks MAC protocols are based on conventional Carrier Sense Multiple Access (CSMA) wireless protocols. Z-MAC is an efficient hybrid protocol which alternates between CSMA and TDMA. It utilizes CSMA in low channel contention and switch to TDMA mode in high channel contention. In this paper, we show that Z-MAC does not perform well under high traffic load. It also proposes few enhancements to achieve better performance.

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