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The proliferation of sensor-equipped smartphones has enabled an increasing number of context-aware applications that provide personalized services based on users' contexts. However, most of these applications aggressively collect users sensing data without providing clear statements on the usage and disclosure strategies of such sensitive information, which(More)
—The surging deployments of Wi-Fi hotspots in public places drive the blossoming of location-based services (LBSs). A recent measurement reveals that a large portion of the reported locations are either forged or superfluous, which raises security issues such as bogus alibis and illegal usage of restricted resources, and leads to some initial investigation(More)
Recent years have seen the proliferation in versatile mobile devices and application services that demand different data rates and latencies. Fixed channelization configuration in today's wireless devices fall inefficient in the presence of such dynamic demands. In this regard, fine-grained spectrum management designs have been advocated by the research(More)
A typical scenario for public WLANs is large audience environment where Wi-Fi hotspots serve scores of mobile devices. The performance of those Wi-Fi hotspots is extremely poor in terms of low goodput and severe delay due to heavy contention and MAC inefficiency. After carefully investigating the traffic patterns in public WLANs, we propose(More)
The continuing advances in the storage and transmission abilities of user equipment have made it possible to share videos through device-to-device communications, which may be an efficient way to enhance the capacity of cellular network to provide wireless video services. In adaptive D2D video streaming, user experience is greatly influenced by the quality(More)
—The vision of Self-Organizing Networks (SON) has been drawing considerable attention as a major axis for the development of future networks. As an essential functionality in SON, cell outage detection is developed to autonomously detect macrocells or femtocells that are inoperative and unable to provide service. Previous cell outage detection approaches(More)
As the demands for mobile phone access to the data services are expanding, advantages in cellular services can be gained by offering enhanced user experience through cost-effective broadband mobile. By reducing the distance between base stations and end users, femtocells provide higher data rates and better indoor coverage. The small size of a femtocell(More)
—In cognitive radio networks (CRNs), collaborative sensing has been considered as an attractive means to improve spectrum sensing performance. However, privacy issues arise when multiple service providers (SPs) collaborate on learning the spectrum availabilities. Specifically, sharing sensing data may enable malicious SPs or secondary users (SUs) to(More)
Many operators have launched femtocell service for ubiquitous indoor coverage. In late March 2010, AT&T announced nationwide roll-out of its 3G Femtocell (named as MicroCell). Both Sprint and Verizon upgraded to 3G CDMA femtocells during 2010. Many operators have launched femtocell service for ubiquitous indoor coverage. In late March 2010, AT&T announced(More)
Much of today's Internet ecosystem relies on online advertising for financial support. Since the effectiveness of advertising heavily depends on the relevance of the advertisements (ads) to user's interests, many online advertisers turn to targeted advertising through an ad broker, who is responsible for personalized ad delivery that caters to user's(More)