Development of the domain name system
SIGCOMM '88 Symposium proceedings on Communications architectures and protocols
Hierarchically-organized, multihop mobile wireless networks for quality-of-service support
Mobile Networks and Applications - Special issue: mobile multimedia communications
Mobile IP; Design Principles and Practices
Mobile IP; Design Principles and Practices
GHT: a geographic hash table for data-centric storage
WSNA '02 Proceedings of the 1st ACM international workshop on Wireless sensor networks and applications
Peer-to-Peer Spatial Queries in Sensor Networks
P2P '03 Proceedings of the 3rd International Conference on Peer-to-Peer Computing
Multi-dimensional range queries in sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
Robust distributed network localization with noisy range measurements
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Combs, needles, haystacks: balancing push and pull for discovery in large-scale sensor networks
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Rapid Development and Flexible Deployment of Adaptive Wireless Sensor Network Applications
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
Energy Efficient Processing of K Nearest Neighbor Queries in Location-aware Sensor Networks
MOBIQUITOUS '05 Proceedings of the The Second Annual International Conference on Mobile and Ubiquitous Systems: Networking and Services
TSAR: a two tier sensor storage architecture using interval skip graphs
Proceedings of the 3rd international conference on Embedded networked sensor systems
Range-free localization and its impact on large scale sensor networks
ACM Transactions on Embedded Computing Systems (TECS)
EnviroSuite: An environmentally immersive programming framework for sensor networks
ACM Transactions on Embedded Computing Systems (TECS)
Collaborative in-network processing for target tracking
EURASIP Journal on Applied Signal Processing
Energy-quality tradeoffs for target tracking in wireless sensor networks
IPSN'03 Proceedings of the 2nd international conference on Information processing in sensor networks
Agimone: middleware support for seamless integration of sensor and IP networks
DCOSS'06 Proceedings of the Second IEEE international conference on Distributed Computing in Sensor Systems
Open framework middleware: an experimental middleware design concept for wireless sensor networks
MUCS '09 Proceedings of the 6th international workshop on Managing ubiquitous communications and services
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Many location based services, such as a those used in healthcare facilities to track medical personnel and equipment, need to keep track of mobile entities across wide areas. These services can be realized in a cost-effective and efficient manner using tiered sensor networks comprised of multiple wireless sensor networks connected by an IP network. To simplify the realization of such services, we present MLDS, a Multi-resolution location directory service for tiered sensor networks. MLDS provides a rich set of spatial query services ranging from simple queries about entity location, to complex nearest-neighbor queries. Furthermore, MLDS supports multiple query granularities which allow an application to achieve the desired tradeoff between query accuracy and communication cost. We implemented MLDS on Agimone, a unified middleware for sensor and IP networks. We then deployed and evaluated the service on a tiered sensor network testbed consisting of tmotes and PCs. Our experimental results show that, when compared to a centralized approach, MLDS achieves significant savings in communication cost while still providing a high degree of accuracy, both within a single sensor network and across multiple sensor networks.