Service mobility support for pervasive grid based on SIP

The goal of Next Generation Grid and pervasive computing models are two of the new models that attract a lot attention in last few years. The current trend is to integrate the two domains, called pervasive grid, where mobile devices can access and provide services. Most current researches adopt the concept that services run in a device and migrate with the device. System developers deal with the problems respectively. They adopt device mobility method to handle the former and service registry system to solve the latter, the traditional manner misses the situation that services may migrate from one device to another and will limit the development of pervasive grid application, ex. personal computing, load balance, etc. In this paper, we transfer the focus from mobile device to mobile service and view each service as an individual network node. We adopt Session initiation Protocol (SIP) to build pervasive grid communication environment and propose a hierarchical SIP architecture to reduce the hand-off frequency caused by the increasing network nodes. Operation details are given and application scenario is presented as a proof of the concept.