No abstract

Fourth generation mobile networks will allow end-users to roam over different network technologies, such as UMTS, CDMA2000 and Wi-Fi. These mobile networks make it possible to determine the location of the mobile terminal, which can be used by applications to provide enhanced services. Each mobile network technology has its specific way to determine the terminal's location, and to provide this information to the end-user or mobile application. Mobile application developers should not be exposed to the peculiarities of the different network technologies, and should be offered a network technology independent API to obtain user location information. In this paper we propose an architecture that provides 3 rd party mobile application developers with a secure API to obtain the user's location over heterogeneous networks that are managed by different parties. The proposed architecture is validated by a proof-ofconcept implementation using UMTS and Wi-Fi networks.

Web Services fail to deliver on the promise of ubiquitous deployment and seamless interoperability due to the lack of a uniform, standards-based approach to all aspects of security. In particular, the enforcement of access policies in a Service Oriented Architecture is not addressed adequately. We present a novel approach to the distribution and enforcement of credentials-based access policies for Web Services (3PAC) which scales well and can be implemented in existing deployments.

In the beyond third-generation (3G) technologies. We focus primarily on the interworking of wireless local area networks (WLANs) (with data rates of 1 Mb/s to 54 Mb/s and a cover range of up to 100 meters) and third generation (3G) mobile networks (with data rates of 64 Kb/s to 2.4 Mb/s and a cover range of a few kilometers), because these networks (which have complementary characteristics) will coexist and will compete to offer network access to end users. However, the issues, principles, and solutions we outline may be applicable to the integration of other wireline and wireless technologies as well.