Abstract
Increasing amount of Wireless Sensor Network (WSN) applications require low network delays. However, current research on WSNs has mainly concentrated on optimizing energy-efficiency omitting low network delays. This paper presents a novel WSN design targeted at applications requiring low data transfer delays and high reliability. We present the whole design flow from user requirements to an actual pilot deployment in a real hospital unit. The WSN includes multihop low-delay data transfer and energy-efficient mobile nodes reaching lifetime of years with small batteries. The nodes communicate using a low-cost low-power 2.4GHz radio. The network is used in a security application with which personnel can send alarms in threatening situations. Also, a multitude of sensor measurements and actuator control is possible with the WSN. A full-scale pilot deployment is extensively experimented for performance results. Currently, the pilot network is in use at the hospital.
Highlights
Wireless Sensor Networks (WSNs) are one of the main building blocks in ambient intelligence, where tiny nodes are embedded into our everyday life objects making them smart
This paper presents a novel WSN design targeted at applications requiring low data transfer delays and high reliability
With the hospital security WSN, personnel can send wireless alarms in threatening situations, receive acknowledgements telling that help is on its way, make various different kind of measurements, and use actuators
Summary
Wireless Sensor Networks (WSNs) are one of the main building blocks in ambient intelligence, where tiny nodes are embedded into our everyday life objects making them smart. WSNs consist of densely deployed, independent, and collaborating microsensor nodes which are highly resource-constrained in terms of energy, processing, and data storage capacity [1, 2]. The nodes are capable of sensing, data processing, and communicating over multiple short distance wireless hops. Most WSN designs concentrate on improving energy-efficiency leaving network delays to low priority [3]. This makes them unsuitable for time-critical applications. Other application areas requiring low communication latencies include surveillance applications and real-time localization
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