Study on a Dynamic Superframe Adjustment Algorithm for IEEE 802.15.4 LR-WPAN

IEEE 802.15.4 can optionally use the superframe structure for data transmission. However, the duty cycle of the superframe structure cannot be dynamically adjusted according to the situation of the entire network. Thus, when the traffic load of the network is high, the insufficient active periods will decrease the transmission opportunities of devices and increase the collision probability. In order to solve this problem, we propose the dynamic superframe adjustment algorithm (DSAA) to dynamically adjust the duty cycle of the superframe according to the channel opportunity and collision ratio observed by the coordinator. Simulation results show that the proposed algorithm outperforms the IEEE 802.15.4 standard and ECAP in terms of goodput, delay and power consumption.