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PlantCare: An Investigation in Practical Ubiquitous Systems
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Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
Age matters: efficient route discovery in mobile ad hoc networks using encounter ages
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
A delay-tolerant network architecture for challenged internets
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WICON '07 Proceedings of the 3rd international conference on Wireless internet
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ICIRA '08 Proceedings of the First International Conference on Intelligent Robotics and Applications: Part I
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EWSN '09 Proceedings of the 6th European Conference on Wireless Sensor Networks
EWSN '09 Proceedings of the 6th European Conference on Wireless Sensor Networks
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ADHOC-NOW '09 Proceedings of the 8th International Conference on Ad-Hoc, Mobile and Wireless Networks
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IEEE Communications Letters
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ACM Transactions on Sensor Networks (TOSN)
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WONS'10 Proceedings of the 7th international conference on Wireless on-demand network systems and services
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IEEE/ACM Transactions on Networking (TON)
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Computer Networks: The International Journal of Computer and Telecommunications Networking
Pervasive and Mobile Computing
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We discuss the use of mobility to enhance network performance for a certain class of applications in sensor networks. A major performance bottleneck in sensor networks is energy since it is impractical to replace the batteries in embedded sensor nodes post-deployment. A significant portion of the energy expenditure is attributed to communications and, in particular, the nodes close to the sensor network gateways used for data collection typically suffer a large overhead as these nodes must relay data from the remaining network. Even with compression and in-network processing to reduce the amount of communicated data, all the processed data must still traverse these nodes to reach the gateway. We discuss a network infrastructure based on the use of controllably mobile elements to reduce the communication energy consumption at the energy constrained nodes and, thus, increase useful network lifetime. In addition, our approach yields advantages in delay-tolerant networks and sparsely deployed networks. We first show how our approach helps reduce energy consumption at battery constrained nodes. Second, we describe our system prototype which utilizes our proposed approach to improve the energy performance. As part of the prototyping effort, we experienced several interesting design choices and trade-offs that affect system capabilities and performance. We describe many of these design challenges and discuss the algorithms developed for addressing these. In particular, we focus on network protocols and motion control strategies. Our methods are tested using a practical system and do not assume idealistic radio range models or operation in unobstructed environments.