Service search technology in autonomous decentralized community system for timeliness

Information services in accordance with users' preference, utilization place and time are required more and more. Autonomous Decentralized Community System (ADCS) has been proposed to provide such services. ADCS consists of many autonomous stationary nodes and its network covers lands. In ADCS various services are provided on the network and their locations are unpredictable. To utilize these services, distributive service discovery technology is available. However, it has problem on response time. This paper proposes the Autonomous Service Search Technology which consists of two techniques. One is search area restriction technique that does not limit request propagation area, but broadcast reply message. The reply follows and catches up with request message propagation, and consequently request forwarding area is restricted. The other is termination detection technique that enables each node to detect termination autonomously by recursive judgment. The effectiveness of proposal on response time is shown by simulation.