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In Wireless Sensor Networks (WSNs), sensor nodes are often deployed in large quantity and high density. Due to dense deployment, the sensed data are often redundant and highly correlated. Transmitting redundant data is not practical in the resource-constrained WSNs particularly from the viewpoint of energy conservation. Data aggregation offers a key solution to curtail the network loads and hence...
Scheduling or allocation of resources becomes one of the fundamental problems in wireless networks when several nodes contend to access a single and a common medium. To design a scalable wireless network, the slot scheduling algorithm must be computationally simple and distributive. In the past, many scheduling algorithms were proposed. However, when these techniques were implemented in dense networks,...
Wireless Body Area Networks (WBANs) are gaining significant attention because they can be very essential for the daily life applications in hospitals, schools, sports centers and gaming centers. In WBANs, reliability is a major factor that affects the system performance. Interference and inefficient routing can make a WBAN unreliable. However, an opportunistic routing technique can help to overcome...
The data forwarding technique via contention among receiving nodes has become a prevalent cross-layer solution for multihop Wireless Sensor Networks (WSNs). In this opportunistic access/routing technique, a next-hop node is selected dynamically on a per-packet basis without knowing a priori of a relay node. As such, the mechanism is robust to frequent network topology changes, scalable to large-scale...
One of the primary mechanisms to mitigate idling energy consumption and reduce communication activities in Wireless Sensor Networks (WSNs) is to put nodes to low duty cycle operation as long as possible. Keeping a small time window (the listen period) is a challenging task, and thus requires appropriate tailoring of duty cycle so as not to compromise network performance. In this work, we explore an...
In large scale single-sink wireless sensor networks (WSNs), scalability of access and routing protocol becomes an issue when the number of hops to reach the sink increases. As one consequence, nodes close to the sink deplete their energy quickly and the energy consumption may not be as efficient as in the small size network. Multi-sink usage can circumvent the problem and reduce the pressure of data...
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