A Novel Energy Efficient for Wireless Hart Applications

Over the past few years, Wireless HART (WHART) is a fast growing wireless sensor network protocol. In this study, we propose a novel Power predicting, Association and Transmission (PpAT) algorithm for improving the overall power consumption in wireless sensor network. This objective is achieved by means of maintaining, equilibrium among the overall throughput required by the system and the power consumed for receiving and transmitting the information. Here, the power required for transmission is selected by the novel algorithm without the influence of repeated power level measurement in the received signal. This power management is designed in three levels, (i) Cluster Scanning, (ii) Sub-node Association and (iii) Beacon Transmission. Cluster scanning is the process of discovering a new neighborhood cluster for the association of nodes and data transfer. During the association process for achieving robustness, a sub node is associated with the head node. PpAT algorithm gives an opportunity to transmit beacon signals at two different power levels (0 and -20 dBm), so that when both the signals are received successfully a node estimates that it is nearest region of the head node and selects low transmission power. In the other case conventional techniques choose the high transmission power. But, PpAT selects high transmission power only if no near head node is visited by the sub node. Beacon transmission is done based on timestamp synchronization between master and slave nodes. Simulation results show that the proposed algorithm extends the network lifetime. With these proposals there is scope for increasing their autonomy in wireless sensor networks.

並列關鍵字

Beacon ； cluster scanning ； lifetime ； power ； wireless HART

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