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Recently, various ubiquitous services interacting with the surrounding physical environment have been attempted using wireless sensor network (WSN). However, these services have still remained in a centralized service architecture in which it is difficult to support real-time response for a large number of mobile sensor nodes. To address this problem, this paper proposes a dynamic reconfigurable agent space (DRAS), which is a dynamically reconfigurable middleware of service agents. The DRAS is designed for indoor WSN which is collaborating with stationary nodes and mobile nodes simultaneously. In the DRAS, service agents can dynamically expand and contract their service areas according to the location of service consumers. To demonstrate the feasibility and performance of the DRAS middleware, the voting service which is an archetypical service was implemented under the DRAS. The results show that the proposed architecture can support fast response for a large number of mobile nodes by effective network traffic distribution and appropriate service processing.

A MIDDLEWARE ARCHITECTURE FOR DYNAMIC RECONFIGURATION OF AGENT SERVICE SPACE IN IN-DOOR LOCATION-AWARE SYSTEM