Journal article

A new analytical model for the IEEE 802.15.4 CSMA-CA protocol

Feng Shu, Taka Sakurai



We give new analytical results for the performance of a wireless sensor network using the energy-conserving CSMA-CA MAC protocol of IEEE 802.15.4. We derive the throughput both under saturation and under a nonsaturation scenario in a star network involving periodic traffic, and validate the accuracy of our results using simulation for both acknowledgement and non-acknowledgement modes. Our analysis relies on the solution of a fixed point equation, and we prove the existence and uniqueness of the fixed point for the saturated case. The initial backoff window that maximizes saturation throughput is derived, and shown to be an approximately linear function of the number of active nodes. We also..

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