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IEEE 802.15.4 standard is designed for low power and low data rate applications with high reliability. It operates in beacon enable and non-beacon enable modes. In this paper, the authors analyze delay, throughput, load, and end-to-end delay of non-beacon enable mode. Analysis of these parameters are performed at varying data rates. Evaluation of non beacon enabled mode is done in a 10 node network. They limit their analysis to non beacon or unslotted version because, it performs better than other. Protocol performance is examined by changing different Medium Access Control (MAC) parameters. They consider a full size MAC packet with payload size of 114 bytes. In this paper, they show that maximum throughput and lowest delay is achieved at highest data rate.
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