POLICY-BASED COOPERATION OF SERVICES IN UBIQUITOUS ENVIRONMENTS Tosbio Tonouchi, Tomohiro Igakura, Naoto Maeda, Yasuyuki Beppu, and Y osbiaki Kiriha Network Laboratories, NEe Abstract: Various kinds of nodes, including cellular phones and information appliances. are to become popular and are expected to provide a variety of services. Cooperation of these services will result in more convenient services than keeping them isolated would. A ubiquitous network is characterized by changeable system configurations. Because of this and the fact that a node is so frequently connected to and disconnected from the network. the global cooperation of services is difficult to describe in flow languages such as Web Services Flow Language (WSFL). One of the solutions to this problem is a policy technology. A policy attached to a node can be added or removed when the node is connected or disconnected. The policies can re-configure a changed system. Keywords: Management of Grid Computing. Clusters, Peer-to-Peer Applications. and Ubiquitous Computing Environments. Policy. Message-oriented system 1. INTRODUCTION The ubiquitous network environment is maturing. Cellular phones with Internet access, personal data assistants (PDAs), and wireless local area networks (LANs) are becoming more and more popular. About 10 years ago, Weiser developed an original PDA called 'Tab' and invented a proprietary protocol for wireless communication [1]. The original version of this chapter was revised: The copyright line was incorrect. This has been corrected. The Erratum to this chapter is available at DOI: 10.1007/978-0-387-35674-7_66 © IFIP International Federation for Information Processing 2003 G. Goldszmidt et al. (eds.), Integrated Network Management VIII