| Summary: | 碩士 === 國立臺灣大學 === 資訊工程學研究所 === 93 === IEEE 802.15.4 is a new standard uniquely designed for low rate wireless personal area
networks (LR-WPANs). It targets ultra-low complexity, cost, and power for low-datarate
wireless connectivity among inexpensive fixed, portable, and moving devices. The
standard allows GTS (Guaranteed Time Slots) for the optional use of high-priority transmissions,
which provides the devices with high-priority data a specific duration of time
to send their frames within a superframe. By using GTS, some applications such as medical
alerts or security systems can benefit from the dedicated use of network bandwidth.
Based on standard IEEE 802.15.4 GTS specification, we propose a new GTS scheduling
scheme to support low-latency transmissions and to retain fairness among low and high
prority transmissions. Performance evaluation shows that in terms of the delay time and
fairness, our proposed scheme significantly outperforms the original scheme proposed in
IEEE 802.15.4 standard.
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