A Continuous Query Index for Processing Queries on RFID Data Stream

RFID middleware systems collect and filter RFID streaming data gathered continuously by numerous readers to process requests from applications. These requests are called continuous queries because they are executed continuously during tag movement. To enhance the performance of the middleware, an index must be built to process these continuous queries efficiently. Several approaches to building an index on queries rather than data records, called query index, have been proposed and are widely used to evaluate continuous queries over streaming data. EPCglobal proposed an Event Cycle Specification (ECSpec) model, which is a de facto standard query interface for RFID applications. Continuous queries based on ECSpec consist of a large number of segments that represent the query conditions. The problem when using any of the existing query indexes on these continuous queries is that it takes a long time to build the index because it is necessary to insert a large number of segments into the...

• Type: Conference
• Year: 2007
• Where: RTCSA
• Authors: Jaekwan Park, Bonghee Hong, ChaeHoon Ban
• Keywords: Continuous Queries, Query Index, Query Indexes, Real-Time Computing, RTCSA 2007