Research And Implementation Of A Multilayer Lite Lowpower WSN Protocol

Wireless sensor network is wireless system with a large number of sensor nodes and they can form together through self-organizing via single or multi hop communication mode. Each sensor node has certain capability of sensing, computing, wireless communication and limited energy. They can associate and cooperate with each other, and then transmit the perception of temperature, humidity sensing information to the observer. The research of wireless sensor network has been transformed by the current theory to industrial application. Now, it’s going into the large-scale application stage.Warehouse monitoring is an essential part in modern logistics supply chain. It is an important means to ensure quality of goods and to prevent the occurrence or worsening of a disaster. Warehouse monitoring has several characteristics, such as high stacking density of goods, random turnover cycle, a large number of sensor nodes. These characteristics have brought challenges for wireless sensor network based on warehouse monitoring application. This paper studied and implemented the WSN protocol for warehousing monitoring field and on this basis, a set of hardware platform with practical value was designed. It effectively solved the limitation the wireless sensor network in warehousing monitoring applications.This paper discussed the message avoidance mechanism, network topology, network mode, data fusion method and time slot assignment algorithm in detail. In this paper, the protocol realized sleep routing and data downlink via WOR. The platform was composed of gateway node and sensor nodes and gateway node could control sensor nodes in real-time. The protocol combined time slot allocation and CSMA-CA in the MAC layer to avoid data collision effectively, formed tree-cluster topology in the network layer with data fusion in the cluster head node, simplified node routing algorithm and reduced the transmission energy loss, proposed a slot allocation algorithm basing on subtree weight to balance the network energy.The sensor node in this monitoring system realized low power management in hardware, and provided low power consumption data display function. The gateway node translated protocols between WSN and TCP/IP. In addition, it provided three modes to access internet: Ethernet, Wi-Fi and GPRS.The protocol stack and hardware platform has been successfully deployed in tobacco alcoholization warehouse of China Tobacco Chuanyu Industrial Corporation, the actual operation shows that. The results indicated that network could be established rapidly and systems ran stably with good scalability and high energy saving. The network life was up to23.5months expectedly.