Analysis of superframe duration adjustment scheme for IEEE 802.15.4 networks

The challenges of the IEEE 802.15.4 beacon-enable mode are how to improve throughput and bandwidth utilization in contention access period and contention free period, respectively. This article proposes a scheme to improve IEEE 802.15.4 medium access control, called superframe duration adjustment scheme (SUDAS). 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 of IEEE 802.15.4, especially for star network, to predict the probability of successful transmission, average bandwidth utilization as well as total network energy consumption. The analytical model and simulation experiments show that the performance of SUDAS is better than that of IEEE 802.15.4 standard in term of the probability of successful packet transmission, average bandwidth utilization and total energy consumption.