RETINA: a real-time traffic navigation system Kam-yiu Lam, Edward Chan, Tei-Wei Kuo, S. W. Ng, and Dick Hung   View Paper (PDF)   Return to Demostrations Abstract The objective of RETINA is to study the important issues in the design of a high-performance soft-real-time information system over a wireless network, where the real-time constraints of data items can be met, and the critical queries can be processed within the system/user requirements. The design of the system involves the technologies developed in the fields of real-time systems and mobile computing, such as data similarity, mobile transaction management, the processing of location-dependent queries, and the processing of continuous queries. The two basic services of RETINA are: (1) to provides real-time traffic information to mobile clients according to their current locations, and (2) to provide path-searching and navigation functions to mobile clients so that they can arrive at their destinations within the deadlines. In the system, the best path to a destination is calculated based on the roads connecting the starting location and the destination, and the real-time traffic conditions of the roads. In the calculation of the road traffic, future traffic conditions are predicted and used. DiSC'02 © 2003 Association for Computing Machinery