m PLACE*: A Distributed Spatio-temporal Data Stream Management System for Moving Objects

Moving objects equipped with locating devices can re-port their locations periodically to data stream sewers. With the pervasiveness of moving objects, one single sewer cannot support all objects and queries in a wide area. As a result, multiple spatio-temporal data stream management systems must be deployed and thus result in a sewer net-work. It is vital for sewers in the network to collaborate in query evaluation. In this paper; we introduce PLACE*, a distributed spatio-temporal data stream management sys-tem for moving objects. PLACE * supports continuous mov-ing queries that hop among multiple regional sewers. To minimize the execution cost, a new Query-Track-Participate (QTP) query processing model is proposed inside PLACE*. In the QTP model, a query is continuously answered by