Receiver beacon transmission interval design for multi-stage wireless sensor networks

U-Bus Air is the protocol that can transmit packets via multi-stages, and is introduced to the smart meter in the medium-high rise apartment house. While it has the feature of asynchrony and power-saving, the interference power increases as the number of nodes increases. In a prior study, Intermittent Receiver-Driven data Transmission (IRDT) MAC has been proposed with finding the appropriate transmission cycle and the communication performance is improved by the derivation of the collision probability. In this paper, we introduce a collision probability analysis of IRDT-MAC to U-Bus Air. However there is a problem that it cannot correspond to a change of link topology. We propose a protocol for controlling receiver beacon transmission interval by the Fusion Center (FC). In this protocol, the link topology of each smart meter is sent to the FC and the FC calculates the suitable transmission cycle from this individual topology. Finally, this suitable transmission cycle is fed back to each node from the FC. By using the computer simulations, the improvement of packet delivery ratio (PDR), the throughput and the reduction of power consumption are confirmed.