Clock synchronization in distributed real-time systems
IEEE Transactions on Computers - Special Issue on Real-Time Systems
GPS-based Clock Synchronization in a Mobile, Distributed Real-Time System
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part I
Data on Air: Organization and Access
IEEE Transactions on Knowledge and Data Engineering
The D-Tree: An Index Structure for Planar Point Queries in Location-Based Wireless Services
IEEE Transactions on Knowledge and Data Engineering
Spatial queries in wireless broadcast systems
Wireless Networks - Special issue: Pervasive computing and communications
Monitoring k-Nearest Neighbor Queries over Moving Objects
ICDE '05 Proceedings of the 21st International Conference on Data Engineering
Conceptual partitioning: an efficient method for continuous nearest neighbor monitoring
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
DSI: A Fully Distributed Spatial Index for Location-Based Wireless Broadcast Services
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
An efficient and scalable approach to CNN queries in a road network
VLDB '05 Proceedings of the 31st international conference on Very large data bases
MobiEyes: A Distributed Location Monitoring Service Using Moving Location Queries
IEEE Transactions on Mobile Computing
Continuous nearest neighbor monitoring in road networks
VLDB '06 Proceedings of the 32nd international conference on Very large data bases
PCC '02 Proceedings of the Performance, Computing, and Communications Conference, 2002. on 21st IEEE International
On Reducing Communication Cost for Distributed Moving Query Monitoring Systems
MDM '08 Proceedings of the The Ninth International Conference on Mobile Data Management
Location-Based Spatial Query Processing in Wireless Broadcast Environments
IEEE Transactions on Mobile Computing
An Adaptive Control Method in the Hybrid Wireless Broadcast Environment
MDM '07 Proceedings of the 2007 International Conference on Mobile Data Management
Dynamic range query in spatial network environments
DEXA'06 Proceedings of the 17th international conference on Database and Expert Systems Applications
A P2P technique for continuous k-nearest-neighbor query in road networks
DEXA'07 Proceedings of the 18th international conference on Database and Expert Systems Applications
What drives global ICT adoption? Analysis and research directions
Electronic Commerce Research and Applications
Event history, spatial analysis and count data methods for empirical research in information systems
Information Technology and Management
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Location-based services is emerging as an important application area for mobile devices. Mobile users can issue location-based queries to probe their surroundings. The interested objects could be either static, such as gas stations, or moving, such as vehicles. We focus on the moving monitoring queries on moving objects. Due to the continuous nature of the query, existing solutions require the query issuer and the objects to frequently update their locations. This leads to high communication cost. We propose a hybrid solution, which employs two ways of communicating: on-demand access and a broadcast channel. We also design two different indexes: the Grid Index and the Direction Index, to facilitate data retrieval from the broadcast channel. We compare the hybrid solution to an existing distributed solution using simulation and analysis. Our solution achieves 30-60% savings in communication cost. We conclude that the hybrid solution with the is more scalable and desirable for medium-to-large-scale deployments.