The Research Of Application Model Supporting Software Migration Used For Resource-Constrained Devices

As the development of computing and communication, smart terminal equipments with communication and computing capability will become ubiquitous. They will provide convenience service for everyone, but people have to face the capacity limitation of their mobile phone. Ubiquitous computing is a new generation of computer after workstation and desktop computer. It's most important character are highly integrated and interaction. Smart space is concentration of these two characters of ubiquitous computer. It is an environment that integrates computing, communication and awareness capability. Ubiquitous computing is target to let anyone to access information anytime, anywhere. How to augment the capability of handheld mobile device by adopting the resources in the environment absorbs a lot of research interest.Pervasive computing equipment is usually device of limited resources. How to strengthen the ability of resource-constrained devices by using abundant resources in the environment is an important topic. Internet provide good platform for reuse of service component .Several calculation entities( service components, progress) help each other, in the resources limited equipments how to aggregate service components together to complete the new mission . For mobile device, how to discovery various service components in the environment. Based on mobile agent, propose the model of service discovery based on P2P. This paper mainly focuses on the research and the application of these problems.The main contributions include:1. The architecture intends to solve the contradiction between the diversity of services to be provided by pervasive computing devices and the resource limitation of the computers embedded in them. By virtue of the idea implementing embedded Internet, software architecture is therefore proposed to be configurable statically and dynamically, and application model supporting software migration used for resource-constrained devices is given in the smart space computing environment, discusses some key technologies and describes an architecture supporting the application mode. In building up the foundation of the environment ontology, we propose the framework of application model for resource-constrained devices .And then we describe its function structure.2. In the platform of Internet, software entity will exists on each node of internet with the state in dynamic and independent way. Each software entity can pass a certain method to release under the open environment, and carry on with other software entities to across the network to connect with each other in various way, mutual communication, cooperation and alliance, thus constitute the new application .The resource-constrained devices need the software entity which run on it has a capacity of adaptive. By studying the foundation of reflect the mechanism, this paper presents a reflective coordination mechanism based on mobile agent.It dynamically adapts both its binding and discovery protocol to allow interoperation with heterogeneous services by uploading different functional components.3. The mobile customer needs to know that which services own in the current environment in order to make use of. currently,there has been criterion and protocol which aims at the fixed conjunction, wired network mostly, and unfit for the complicated dynamic network environment. Under the condition of the wireless network bandwidth limited resources, how to make resource-constrained device to discover various service is an important research. The paper analyses scarcity in traditional mechanism of web service discovery .For the specific problem of the mobile embedded environment,it proposes a web service discovery mechanism based on mobile agent above P2P network .The architecture and key technology of designing the framework are discussed.