Abstract-In this paper we propose a QoS based routing protocol for wireless sensor network applications that support both periodic and event-based data reporting. A geographic routing mechanism combined with QoS support is used to forward packets in the network. Data is routed based on the packet type. To route packets with different priorities, multiple transmission queues are used. In choosing the next hop, the node that is closer to the sink, has high residual energy, high link quality, and low load is selected. Congestion control is achieved by using a ring or barrier mechanism that captures and aggregates messages that report the same event to the same sink. We present the main operations of the barrier mechanism, including barrier formation, repair, enlarge, shrink, and termination. Simulation results using JIST/SWANS simulator show the performance of our routing protocol compared with other related works.

A wireless sensor network can detect single (or atomic) events or composite events. Since sensors are battery powered and in general, it is hard to recharge them, energy management is always an important issue. In this paper, we study the SCED problem; given a wireless sensor network deployed for watching a composite event x 1 , x 2 , . . . , x M , design a sensor scheduling mechanism such that the set of active sensors ensure the coverage and connectivity conditions and WSN lifetime is maximized. Network lifetime is organized in rounds. Each round has two phases: initialization and data collection. In the initialization phase, the goal is to choose a set of active sensors as sensing nodes or relay nodes such that to achieve both coverage and connectivity requirements. Sensors which are not chosen to be active go to sleep to save energy. In the data collection phase, active sensors perform sensing and data relaying. When another round begins, a new set of active sensors are determined. Two solutions are proposed for the SCED problem, a grid-based distributed algorithm and a localized algorithm. We analyze their performance through simulations.

Abstract-In the United States, there has been a high incidence of hurricanes over the past decade. Before a hurricane makes landfall it is important, for safety, that people who live in potentially dangerous areas, such as along the coast, evacuate. Nursing homes have an even greater concern during an evacuation as the patients are primarily elderly or disabled, and require additional assistance. In this paper we investigate the characteristics and challenges associated with hurricane evacuation of health care centers, such as nursing homes. Then, we propose a patient centric hurricane evacuation management system that allow healthcare providers to continuously monitor and track patients. The hardware and software architecture, and the main operations are presented. The proposed system is able to operate in difficult conditions, such as lack of basic communication services such as cellular and Internet, temporary network partition, and scarce energy resources.Keywords: wireless body area network, architecture design, hurricane evacuation management system, energy efficiency.

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