Abstract
The challenge of the IEEE 802.15.4 beacon-enabled mode is how to improve throughput and bandwidth utilization in contention access period (CAP) and contention free period (CFP), respectively. This article proposes a scheme to improve IEEE 802.15.4 medium access control, called superframe duration adjustment scheme (SUDAS), which analyzes the overall of the IEEE 802.15.4 not only CAP but also CFP. SUDAS is expected to effectively allocate guaranteed time slot to the requested devices, it adjusts the length of the slot in superframe duration based on the length of the packet data. This article also presents a comprehensive Markov chain analysis for SUDAS, especially for star topology, to predict the probability of successful transmission, network goodput, average bandwidth utilization, as well as total network energy consumption. The validity of the analytical model is proven by closely matching the simulation experiments. SUDAS performs better than other algorithms in terms of the probability of successful packet transmission, network goodput, average bandwidth utilization, and total energy consumption.
Highlights
The Institute of Electrical and Electronics Engineers (IEEE) 802.15.4 standard has been designed to specify the physical layer (PHY) and medium access control (MAC) sublayer for low power consumption, short transmission range, and low-rate wireless personal area network (LR-WPAN) [1]
IEEE 802.15.4 can operate on beacon- and non-beacon-enabled modes and has three kinds of topologies: star, peer-to-peer, and cluster tree topologies
The network coordinator transmits beacon to synchronize and provide necessary information to the devices in beacon enabled-mode, while the unslotted carrier sense multiple access with collision avoidance (CSMA/ CA) protocol is used in non-beacon-enabled mode
Summary
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