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Aura: an Architectural
Framework
for User Mobility in Ubiquitous Computing
Environments
João Pedro Sousa, David Garlan
Software Architecture:
System Design, Development, and Maintenance
(Proceedings of the 3rd Working IEEE/IFIP
Conference on Software Architecture)
Bosch, Gentleman, Hofmeister, Kuusela (Eds),
Kluwer Academic Publishers, pp. 29-43, August 2002.
@inproceedings{
author = "Jo\~{a}o Sousa and David Garlan",
title = "Aura: An Architectural Framework for User
Mobility in Ubiquitous Computing Environments",
booktitle = "Software Architecture: System Design,
Development, and Maintenance (Proceedings of the 3rd Working IEEE/IFIP
Conference on Software Architecture)",
month = Aug,
year = 2002,
pages = {29--43},
address = "Montreal,
Canada"
}
Abstract
Ubiquitous computing poses a number of challenges for
software architecture. One of the most important is the ability to design
software systems that accommodate dynamically-changing resources. Resource
variability arises naturally in a ubiquitous computing setting through user
mobility (a user moves from one computing environment to another), and
through the need to exploit time-varying resources in a given environment
(such as wireless bandwidth). Traditional approaches to handling resource
variability in applications attempt to address the problem by imposing
uniformity on the environment. We argue that those approaches are inadequate,
and describe an alternative architectural framework that is better matched to
the needs of ubiquitous computing. A key feature of the architecture is that
user tasks become first class entities. User proxies, or Auras, use
models of user tasks to set up, monitor and adapt computing environments
proactively. The architectural framework has been implemented and is
currently being used as a central component of Project Aura, a campus-wide
ubiquitous computing effort.
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