Efficient multiple gateway system for WSN management in BEMS

Among various application scenarios of Internet of Things (IoT) technology, Building Energy Management System (BEMS) is one of the most promising applications considering the sustainable development trend in the world. With progress of related technologies, the BEMS can gather more and more applications into itself. But the development also involves an issue which is huge data transferring and processing. This paper provides a multiple gateway system for wireless sensor network (WSN) management in BEMS, and also provides an efficient data transmission method for sensor data collection. The multiple gateway system includes at least a main gateway, several terminal gateway and more sensor nodes. These sensor nodes find a nearest terminal gateway and access to its LAN, and send data to it. The terminal gateway with a control module on it, can collect information of every neighbor gateway including gateway buffer size and distance to itself, and then optimize routing according to gateway information, and finally sends data to main gateway timely. The main gateway can process data like data fusion, and users can access these data via LAN or Internet. Using these multiple gateway system, the network power consumption and data delay can be both decreased, thereby promoting the system working efficiency.