Design and evaluation of scalable ubiquitous discovery system

Some future advanced applications such as contextaware communication and object status tracing require a mechanism to collect detailed sensor data from the real world and distribuite it in real time. This paper describes design of SUDS (Scalable Ubiquitous Discovery System) which adopts flat ID management so that an end user can flexibly assign unique IDs to objects. Though previous P2P protocols are appropriate for discovery of IDs that have flat architecture, peers in mobile network suffer from frequent routing table update. Previous protocols triger unnecessary routing table update whenever a node is disconnected from the network, because a temporarily disconnected peer is regarded as a peer that leaves the P2P network. We propose a wireless-aware P2P protocol for SUDS, which assures responsiveness against temporal network disconnection by multiple path function instead of pruning the disconnected peer away from the P2P network. The proposed protocol is implemented and evaluation results show that the multiple path routing function is effective for the realtime discovery of information with an acceptable increase in network traffic.