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ABSTRACT IEEE 802.15.4 reserves transmission time to support real-time transport by sending GTS request packets to the PAN coordinator in advance. This paper introduces GTS-FAT technique to reduce the reservation time by giving a higher sending priority to GTS request packets than data packets. Differently from the conventional scheme where these two kinds of packets share a single transmission queue, GTS-FAT scheme allocates two queues with two different contention window sizes like IEEE 802.11e. This paper also proposes an analytical GTS delay model by combining the two legacy models for 802.15.4 and 802.11e to accurately predict the GTS-FAT delay over a given network topology. Our analysis shows that GTS-FAT reduces GTS service delay by up to 50% at the expense of the data delay by only up to 6.1% when GTS request packets four times outnumber data packets.Keywords:GTS-FAT, 802.15.4, real-time applications, priority, GTS request, delay 1.   1)     (LR-WPANs: Low Rate Wireless Personal Area Networks)   (IEEE: Institute of Electrical and Electronics Engineers) 802.15.4 [1] . 802.15.4  802.11[2]

An Analytical Model for GTS Service Delay of IEEE 802.15.4 with Two Priority Queues