Intermittent Interval Feedback Design for Multi-Stage Wireless Sensor Networks
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Smart meters are needed for realizing energy savings and automatic meter reading. As smart meters used for the gas or water supply infrastructure cannot always receive supplied power, a low-power-consumption communication protocol for battery-powered smart meters is required. The U-Bus Air protocol is standardized for gas meters in mid- and high-rise buildings. U-Bus Air has the features of low power consumption using time asynchronous communication and multi-hop communication among nodes. However, the interference power increases as the number of nodes increases. In order to solve the problem, intermittent receiver-driven data transmission media access control (IRDT-MAC) was proposed; it finds the appropriate transmission cycle (intermittent interval); the communication performance is improved using the derivation of the collision probability. On the other hand, IRDT-MAC cannot correspond to a change of link topology. In this paper, we propose a protocol for controlling the receiver beacon transmission interval using the fusion center (FC) for solving the above problem. In this protocol, the link topology of each smart meter is sent to the FC and the FC calculates the suitable transmission cycle for this specific topology. Finally, the suitable transmission cycle is fed back to each node from the FC. Using computer simulations, improvements of the packet delivery ratio (PDR), the throughput, and the power consumption are confirmed in two topologies. Specifically, the improvements are confirmed in the case of two stages or more in the building-wide square topology.
KeywordsWireless sensor networks MAC protocol Wi-SUN U-Bus Air Smart mater Intermittent interval
This work contains the results of joint research with Tokyo Gas Co., Ltd.
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