Towards a general location service for mobile environments

With the advent of mobile computing devices and cheap location sensing systems, location information has become an important resource both for mobile and `desktop´ users. We describe some key concepts a scalable ubiquitous location service should be based on. Firstly, we discuss the general problem of client-server computing in mobile environments. Secondly, we describe the theoretical and design framework for a general location service. We address the use of multiple sources of location information. Further, we describe location domains as a powerful framework for presenting and protecting location information