Performance analysis of unsaturated slotted IEEE 802.15.4 medium access layer

In this paper, we analyze the uplink performance of unsaturated slotted IEEE 802.15.4 medium access layer using the Markov chain model and the theory of M/G/1 queues. In our treatment the emphasis is paid to retransmission due to collision of packets, since it plays a very important role in the behavior of the slotted CSMA-CA algorithm. The validity of the proposed model is demonstrated by good agreements between the model results and Network Simulator 2 (ns-2) simulations.