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Location-based services (LBSs) are attracting more and more attentions with the increasing popularity of mobile devices and online social networking. In LBSs, users can conveniently obtain their interested information by sending queries to the LBS server. However, users' queries include their identities, locations, interests, etc, which may result in the leakage of users' trajectory and other sensitive...
Location-aware smart phones support various location-based services (LBSs): users query the LBS server and learn on the fly about their surroundings. However, such queries give away private information, enabling the LBS to identify and track users. We address this problem by proposing the first, to the best of our knowledge, user-collaborative privacy preserving approach for LBSs. Our solution, MobiCrowd,...
The large scale adoption of mobile phones brings a merging mobile commerce market. Most wireless applications are based on GPRS to provide services in wide areas, while some location based services are based on Bluetooth to enable mobile users to enjoy proximity services. However, very few systems marry the two communication technologies together to provide a more pervasive wireless system with which...
Data broadcasting is an effective way to disseminate information to a large amount of mobile clients in wireless mobile environments. The k nearest neighbor (kNN) search is one of the important location-based services. In this paper, we propose kNN search protocols using data broadcasting. We consider how the server generates the broadcast schedule with a Voronoi diagram and how the client can efficiently...
Because of recent advances in both client devices and wireless communications, industry has started to look at the potentially relevant market of Location Based Services (LBSs). IP Multimedia Subsystem (IMS) and IMS-based presence service are putting together and standardizing the needed support for location data dissemination in industry-level LBS applications. However, the deployment of presence-based...
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