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—We study the rendezvous data collection problem for the mobile sink in wireless sensor networks. We introduce to jointly optimize trajectory planning for the mobile sink and workload balancing for the network. By doing so, the mobile sink is able to efficiently collect network-wide data within a given delay bound and the network can eliminate the energy(More)
Recent studies in wireless sensor networks (WSN) have observed that the irregular link quality is a common phenomenon, rather than an anomaly. The irregular link quality, especially link asymmetry, has significant impacts on the design of WSN protocols. In this paper, we propose two asymmetry-aware link quality services: the neighborhood link quality(More)
We present <i>Score</i>, a sensor core framework for cross-layer design in wireless sensor networks. Network components running in the context of <i>Score</i> have the ability to collaborate without the need for pair-wise interfaces. This collaboration promotes protocol optimization in the resource constrained wireless sensor networks, a technique widely(More)
Acoustic alarms have been credited with saving thousands of lives from fires, gas leakage and electric leakage each year. By broadcasting sound with different tones, loudness and timbres, acoustic alarms keep people aware of surroundings, inform them of serendipitous events, and notify them critical information. However, maintaining the safety awareness(More)
For some sensor network applications, the problem of sweep coverage, which periodically covers POIs (Points of Interest) to sense events, is of importance. How to schedule minimum number of mobile sensors to achieve the sweep coverage within specified sweep period is a challenging problem, especially when the POIs to be scanned exceeds certain scale and the(More)
—We study the heterogeneous data collection problem for a Mobile Element (ME) in a WSN. Different from previous efforts, we consider a more practical network scenario where the link quality is instable, the data generation rates on different sensor nodes are distinct, and the sensory data cannot be aggregated in transmission. We propose to minimize the(More)
—We study the rendezvous data collection problem for the Mobile Element (ME) in heterogeneous sensor networks where data generation rates of sensors are distinct. Different from previous efforts, the link quality is instable in our network model and the sensory data cannot be aggregated when transmitting. We introduce to optimize the energy consumption on(More)
As more and more real Wireless Sensor Network's (WSN) applications have been tested and deployed over the last five years, the research community of WSN realises that several issues need to be revisited from practical angles, such as reliability and security. In this paper, we address the reliability issue by designing a general energy-efficient, load(More)
In this paper, we combine coarse-grained software pipelining with DVS (Dynamic Voltage/Frequency Scaling) for optimizing energy consumption of stream-based multimedia applications on multi-core embedded systems. By exploiting the potential of multi-core architecture and the characteristic of streaming applications , we propose a two-phase approach to solve(More)
Motivated by realistic sensor network scenarios that have fading environment and opportunistic transmission, we propose a novel routing protocol, OMR, which integrates routing and MAC protocols to improve the packet delivery ratio, reduce the packet delivery latency, and decrease the energy consumption in multi-hop wireless sensor networks. OMR chooses a(More)