中文摘要：

随着下一代网络（NGN）各种技术的遥步发展，如何在NGN中使用户不受干扰地享受各种业务将成为未来应用的热点，目前研究的上下史感知（context—aware）技术正好可以实现这个目的，因此，设计一种协议来实现各种基于context的自适应业务是至关重要的。考虑到SIP协议灵活且易于扩展，结合当前一些广泛应用的context—awsre业务，提出了一个基于SIP扩展的CASIP。通过对context的研究，引入context服务器，给出了增强的网络架构，详细阐述了基于CASIP协议的上下文感知业务的实现技术。

英文摘要：

With the gradually development of various technologies for NGN, how to make users receive diverse services with minimal i ：trusiveness becomes a popular issue in future. The current research on context-aware technology just answers for such issue. The context information is very rich. It can be obtained by various devices. Therefore, it is very important for us to design a protocol based on context information for various adaptive services. Considering SIP which is flexible and extensible together with some context-aware services to have been widely used now, the authors propose a protocol based on the extension of SIP. At first, this paper does some research into the context, secondly, introduce the context server, and then propose the enhanced network framework.. Finally, the authors depict the CASIP in details.