Achieving service portability in ICEBERG

There is a growing trend toward service access through heterogeneous devices from diverse networks. It thus becomes crucial to provide support for mobility and portability at the application and service level to enable seamless service access from any end devices and access networks. Such support allows transparent roaming and ubiquitous service access. In the ICEBERG project (Wang et al. 2000), our goal is to develop such a service infrastructure to integrate a variety of telephony and data services spanning diverse access networks reaching heterogeneous end users. In this paper, we discuss our techniques for achieving the goals of personal and service mobility, transparent network- and device-independent service access, as well as highly scalable and fault-tolerant access to composed service entities across a wide area. We evaluate our implementation through applications such as Universal In-box, Interactive Voice Room Control, MP3-Jukebox access using a cell-phone, and realtime video delivery to wireless clients