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Mobile agent technologies are effective ways of deploying applications in wireless sensor networks (WSN). There are currently several different approaches for enabling communication between agents operating on a WSN, but none of them allows for dynamic agent location determination. This introduces some restrictions which severely limit the usefulness of mobile agents on WSNs. In this paper, we propose a name-based location service for mobile agents in a WSN. The approach is largely implemented through the regular placement of landmark nodes across the WSN. We show that our approach can enable communication with the nearest target agent and maintains a constant level of communication among mobile agents over the whole WSN.

In pervasive computing environment (Satyanarayanan, 2001), common context management system, that make context of the real world be shared among the context-aware applications, is required to reduce development cost of each context-aware applications. A wireless sensor network (WSN) will be a key infrastructure for the context management system. Towards pervasive computing, a WSN integrated into context management system should be open infrastructure. In an open WSN should (1)handle various kinds of tasks, (2)manage tasks at runtime, (3)save resource consumption, and (4)adapt to changes of environments. To develop such an open WSN, middleware supports are needed, and our XAC project tries to develop a middleware for the open WSN. The XAC project is a research project to develop a middleware for open WSN. In this chapter, the auhors show research issues related to open WSN from the viewpoints of task description language, runtime task management, self-adaptability, and security.

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