Springer Science+Business Media
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 paper proposes a scheme to improve IEEE 802.15.4 medium access control, called SUper frame 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 super frame duration based on the length of the packet data. This paper also presents a comprehensive Markov chain analysis for SUDAS, especially for star topology, to predict the probability of successful transmission, network good put, average bandwidth utilization, as well as total network energy consumption.