Communications of the ACM - Internet abuse in the workplace and Game engines in scientific research
Practical robust localization over large-scale 802.11 wireless networks
Proceedings of the 10th annual international conference on Mobile computing and networking
Reducing MAC layer handoff latency in IEEE 802.11 wireless LANs
Proceedings of the second international workshop on Mobility management & wireless access protocols
Using smart triggers for improved user performance in 802.11 wireless networks
Proceedings of the 4th international conference on Mobile systems, applications and services
Statistical learning theory for location fingerprinting in wireless LANs
Computer Networks and ISDN Systems
Data Mining: Practical Machine Learning Tools and Techniques, Second Edition (Morgan Kaufmann Series in Data Management Systems)
Improving layer 3 handoff delay in IEEE 802.11 wireless networks
WICON '06 Proceedings of the 2nd annual international workshop on Wireless internet
Overhearing the Wireless Interface for 802.11-Based Positioning Systems
PERCOM '07 Proceedings of the Fifth IEEE International Conference on Pervasive Computing and Communications
Loc{lib,trace,eva,ana}: research tools for 802.11-based positioning systems
Proceedings of the second ACM international workshop on Wireless network testbeds, experimental evaluation and characterization
PERCOM '08 Proceedings of the 2008 Sixth Annual IEEE International Conference on Pervasive Computing and Communications
Automatic mitigation of sensor variations for signal strength based location systems
LoCA'06 Proceedings of the Second international conference on Location- and Context-Awareness
Mobility detection using everyday GSM traces
UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
Location sensing and privacy in a context-aware computing environment
IEEE Wireless Communications
Improving Location Fingerprinting through Motion Detection and Asynchronous Interval Labeling
LoCA '09 Proceedings of the 4th International Symposium on Location and Context Awareness
A study on user acceptance of error visualization techniques
Proceedings of the 5th Annual International Conference on Mobile and Ubiquitous Systems: Computing, Networking, and Services
Fundamental services for context-sensitive mobile applications
Proceedings of the 5th Annual International Conference on Mobile and Ubiquitous Systems: Computing, Networking, and Services
Inferring motion and location using WLAN RSSI
MELT'09 Proceedings of the 2nd international conference on Mobile entity localization and tracking in GPS-less environments
Energy-aware resource sharing with mobile devices
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Using 802.11 concurrently for communications and positioning is problematic, especially if location-based services (e.g., indoor navigation) are concurrently executed with real-time applications (e.g., VoIP, video conferencing). Periodical scanning for measuring the signal strength interrupts the data flow. Reducing the scan frequency is no option because it hurts the position accuracy. For this reason, we need an adaptive technique to mitigate this problem. This work proposes ComPoScan which, based on movement detection, adaptively switches between light-weight monitor sniffing and invasive active scanning to allow positioning and to minimize the impact on the data flow. The system is configurable to realize different trade-offs between position accuracy and the level of communication interruption. We provide extensive experimental results by emulation on data collected at several sites and by validation in several real-world deployments. Results from the emulation show that the system can realize different trade-offs by changing parameters. Furthermore, the emulation shows that the system works independently of the environment, the network card, the signal strength measurement technology, and number and placement of access points. We also show that ComPoScan does not harm the positioning accuracy of a positioning system. By validation in several real-world deployments, we provided evidence for that the real system works as predicted by the emulation. In addition, we provide results for ComPoScan's impact on communication where it increases throughput by a factor of 122, decreases the delay by a factor of ten, and the percentage of dropped packages by 73 percent.