Abstract
This paper proposes and implements a new TDMA-based MAC protocol for providing timely and reliable delivery of data and command for monitoring and control networks. In this kind of network, sensor nodes are required to sense data from the monitoring environment periodically and then send the data to a sink. The sink determines whether the environment is safe or not by analyzing the acquired data. Sometimes, a command or control message is sent from the sink to a particular node or a group of nodes to execute the services or request further interested data. The proposed MAC protocol enables bidirectional communication, controls active and sleep modes of a sensor node to conserve energy, and addresses the problem of load unbalancing between the nodes near a sink and the other nodes. It can improve reliability of communication significantly while extending network lifetime. These claims are supported by the experimental results.
Highlights
Context-aware safety monitoring and control applications that collect data from the target environment using Wireless Sensor Networks (WSNs), analyze the collected data, and judge the situation of the environment are in a growing need in industrial fields
We identify the problems of the existing MAC protocols, and in particular we analyze the effect of slot reuse in small control networks
We proposed the demand-based slot assignment (DSA) algorithm [23] which does not take into account slot reuse and generates a graceful schedule suitable for filtering and aggregation that takes the pattern of sending-after-receiving such that all receiving slots are followed by all sending slots
Summary
Context-aware safety monitoring and control applications that collect data from the target environment using Wireless Sensor Networks (WSNs), analyze the collected data, and judge the situation of the environment are in a growing need in industrial fields. A series of Liquefied Petroleum Gas (LPG) tanks are built inside an LPG tank that has to be kept at the extremely low temperature, less than −47 °C In this building process, people perform work to shield the outer wall of a tank with some thermal insulation materials such as styrofoam, urethane, or glass wool, etc. Each sensor communication device can be integrated with various sensor modules such as a thermal sensor module, a gas sensor module, an oxygen sensor module, a smoke sensor module, and a flame sensor module that have different power consumption level They obtain data from environment periodically and send the data to a server via a WSN. The server collects data and analyzes the data to judge whether the target environment is safe or not If it detects a dangerous situation, it warns the workers of the situation. This kind of system is referred to as a Safety
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