Sharing of location data enables numerous exciting applications, such as location-based queries, location-based social recommendations, monitoring of traffic and air pollution levels, etc. Disclosing exact user locations raises serious privacy concerns, as locations may give away sensitive information about individuals’ health status, alternative lifestyles, political and religious affiliations...

Location-Based Services (LBS) provide more useful, intelligent assistance to users by adapting to their geographic context. For some services that context goes beyond a location and includes further spatial parameters, such as the user’s orientation or field of view. Here, we introduce Gaze-Informed LBS (GAIN-LBS), a novel type of LBS that takes into account the user’s viewing direction. Such a...

Location-based services and applications are especially useful in mobile computing environments. However, mobile computing environments are intrinsically heterogeneous, since different network technologies could be used and integrated, like GPRS and 802.11. The challenge for researches and industry is to build a common infra-structure that enable the development of mobile applications despite s...

Advances in wireless networks and mobile devices have motivated an intensive research effort in mobile computing and mobile data services. The goal is to provide users with anywhere and anytime connectivity to the Internet and access to services that are valuable according to the context of the user. One of the most interesting context factors is the location of the user. Thus, context-awarenes...

Location-Based Services (LBS) are gaining importance due to the advances in mobile networks and positioning technologies. Nevertheless, the wide deployment of LBS can jeopardise the privacy of their users, so ensuring user privacy is paramount to the success of those services. This article surveys the most relevant techniques for guaranteeing location privacy to LBS users. The rigid dichotomy b...