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Wireless sensor networks (WSN) are practical implementations of distributed computing ad-hoc wireless networks. Typically empowered with scarce energy resources and limited computing power, they are mainly used for in situ data acquisition and monitoring of the deployment area. As such, they are susceptible to various forms of jamming, at the physical and data link layer. Of special interest are the...
Recent technological advances in sensors, low power integrated circuits, and wireless communications have enabled the design of low-cost, lightweight, and intelligent physiological sensor nodes. The IEEE 802.15.4 is a new wireless personal area network standard designed for wireless monitoring and control applications. The fast progress of research on energy efficiency in wireless sensor networks,...
Efficiency of the medium access protocol is crucial for wireless sensor networks. For sensor nodes that are battery powered, it is sometimes difficulty or impractical to charge or replace exhausted battery. The sensor nodes collaborate for a common application such as environmental monitoring. The low sensing ranges result in dense networks. The medium access protocol (MAC) for wireless sensor network...
Energy is scarce in sensor nodes. Therefore wireless sensor networks aim to transmit as few packets as possible. An often used technique is to aggregate data coming from multiple sensor nodes into a single packet. In this paper, we broaden this approach so that control information can also be sent together with other (control) information. The benefits of this broadened aggregation approach are discussed,...
Energy consumption is one of the most important design criteria in wireless sensor networks. Sensor nodes are expected to be battery-equipped. Due to their working environments, recharging or replacing batteries for each node is difficult and uneconomical. So prolonging the service lifetime of sensor nodes is a critical issue. The MAC protocol for WSNs plays a very important role in the control of...
Body sensor networks are an interesting emerging application of wireless sensor networks to improve healthcare and the quality of life. Current research has mainly focused on single-hop networks, although some works clearly show advantages of multi-hop architectures. In this paper, we model probabilistic connectivity in such multi-hop body sensor networks. Instead of using a circular coverage area,...
A typical wireless sensor network (WSN) operates under the harsh constraints of limited power resources, which poses challenging problems in its network design process. As a result, the energy consumption characteristics of the WSN need to be precisely studied across different layers of the communication protocol stack. In this paper, we present a thorough investigation on the energy consumption of...
In the wireless sensor networks (WSNs), Synchronous approaches share the schedule information that specifies the cycle of active and sleep period by the control packets. On the other hand, asynchronous approaches do not exchange the synchronization information to send or receive data. Instead, they employ preamble sampling to do that. In this paper, we compare and analyze synchronous and asynchronous...
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