Abstract
One of the major challenges in design of wireless sensor networks (WSNs) is to reduce energy consumption of sensor nodes to prolong lifetime of finite capacity batteries. In this paper, we propose energy-efficient adaptive scheme for transmission (EAST) in WSNs. EAST is an IEEE 802.15.4 standard compliant. In this scheme, open-looping feedback process is used for temperature-aware link quality estimation and compensation, wherea closed-loop feedback process helps to divide network into three logical regions to minimize overhead of control packets. Threshold on transmitter power loss ([Formula: see text]) and current number of nodes ([Formula: see text]( t)) in each region help to adapt transmit power level ([Formula: see text]) according to link quality changes due to temperature variation. Evaluation of the proposed scheme is done by considering mobile sensor nodes and reference node both static and mobile. Simulation results show that the proposed scheme effectively adapts transmission [Formula: see text] to changing link quality with less control packets overhead and energy consumption as compared to classical approach with single region in which maximum transmitter [Formula: see text] assigned to compensate temperature variation.
Highlights
wireless sensor networks (WSNs) are currently being considered for many applications, including industrial, security surveillance, medical, environmental, and weather monitoring
As sensor nodes usually operate on limited battery, each sensor node communicates using a low power wireless link, and link quality varies significantly due to environmental dynamics like temperature and humidity
To efficiently compensate link quality changes due to temperature variations, we propose a new scheme for power level (Plevel) control efficient adaptive scheme for transmission (EAST) that improves network lifetime while achieving required reliability between sensor nodes
Summary
WSNs are currently being considered for many applications, including industrial, security surveillance, medical, environmental, and weather monitoring. As sensor nodes usually operate on limited battery, each sensor node communicates using a low power wireless link, and link quality varies significantly due to environmental dynamics like temperature and humidity. To efficiently compensate link quality changes due to temperature variations, we propose a new scheme for Plevel control EAST that improves network lifetime while achieving required reliability between sensor nodes. This scheme is based on combination of open-loop and closed-loop feedback processes in which we divide network into three regions on basis of threshold on RSSIloss for each region. Estimated link quality degradation is effectively compensated using closed-loop feedback process by applying the proposed scheme.
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