Mobile wireless environments present new challenges to the design and validation of system supports for facilitating development of mobile applications. This dissertation concerns two major system-support mechanisms in mobile wireless networks, namely, location management and service management. We address this research issue by considering three topics: location management, service management,...

As more services become available on networks, and as ad hoc network grows in popularity, the problem of service location will grow. Service location is the detection of a service through automated means, and the subsequent configuration of the service user to use that service. A number of service discovery protocols currently exist, but there is no known framework for the evaluation and compar...

The goal of the Nexus Event Service is to detect state change in services including the distributed Nexus Location Service. So far only state change on an isolated location service node can be detected. This work presents a model for distributed observation of events tailored to Nexus. With this model state change in a distributed set of location service nodes can be detected.

Location privacy is of utmost concern for location-based services. It is the property that a person’s location is revealed to other entities, such as a service provider or the person’s friends, only if this release is strictly necessary and authorized by the person. We study how to achieve location privacy for a service that alerts people of nearby friends. Here, location privacy guarantees tha...

Location-based services (LBSs), such as location-specific contents-providing services, presence services, and E-911 locating services, have recently been drawing much attention in wireless network community. Since LBSs rely on the location information in providing services and enhancing their service quality, we need to devise a framework of directly using the location information to provide a ...

| Location information about mobile users or other mobile objects is a valuable input for many applications in mobile computing and wireless communications. As this information is used by an increasing number of applications it is not practical for them to gather the location information themselves, as most systems do now. These applications could be developed much easier if they were based on ...

Today’s location-sensitive service relies on user’s mobile device to determine its location and send the location to the application. A location-based service is a service that determines the location of a mobile device and uses this to provide functionalities and information specific to that location. With the growth of the importance and of the audience of location-based services, questions o...

Location-based services (LBS) to date offer information and specific services tailored to the current geographic usage environment. The “location service” delivering the required location information in turn is provided by a location platform using specific positioning technologies and geodetic data (e.g. maps). Currently no single positioning technology or location platform can provide a locat...

Location-based services or LBS refers to value-added service by processing information utilizing mobile user location. For this kind of LBS, the role of security service is very important in the LBS that store and manage the location information of mobile devices and support various application services using those location information. And in all phases of these functions that include acquisit...