A pervasive computing system has to be context-aware because it cannot distract users. However, user's context information can be quite rich and unpredictable. Therefore, how to design an extensible protocol to achieve these requirements and implement a context-aware Internet service is very important. In this paper, we propose a SIP-compatible protocol for context-aware services, and this protocol is easy to understand, implement, and deploy. We also demonstrate some scenarios about this protocol to show transactions between client and server as well as behaviors of proxy/redirect servers. Finally, our projects implemented by this protocol are introduced. This study also provides a further insight on the issues of context-aware concept in pervasive computing, and demonstrates a referable methodology to propose and implement a context-aware framework in pervasive computing, which can promote the technology of future Internet.
Wireless Communications and Networking, 2003. WCNC 2003. 2003 IEEE, pp.2058~2063(vol.3)