Research On RFID Complex Event Processing Technology

Radio Frequency Identification (RFID) as an efficient data collection and automatic identification technology has broad application prospects in manufacturing, logistics, medical, transportation and retail etc. But with the rapid development of RFID technology and its expanding application scale, RFID systems will produce large amounts of data, the data volume exceeds the capacity of present information systems. Therefore, RFID complex event processing technology has become one of key technologies in RFID, and complex event processing mechanism is to be recognized as an effective method of RFID data processing.This paper mainly studies the RFID complex event processing method and the problem of timestamp out-of-order in the process of RFID event processing. After summarizing previous RFID event processing methods, this paper presents a RFID complex event processing method ERD, which combines the detected event and intermediate results sharing mechanism organically, and on this basis propose a method GOM to solve the problem of timestamp out-of-order in the process of RFID event processing. Main work of this paper include:Firstly, this paper summarizes the composite structure of RFID system , working principle, and characteristics of RFID data. Research the essential theory of complex event processing technology. On this basis, compares the current popular and representative RFID complex event processing methods and analyzes their advantages and disadvantages, providing a theoretical and experimental basis for the follow-up study.Secondly , in accordance with the feature for the RFID data ,comparing to the existing RFID complex event processing methods, this paper proposes a RFID complex event processing method ERD based on pattern matching theory, which focuses on intermediate results sharing problem in the process of event detection, using complex events identifying network to detect composite events, and employing active query command mechanic to achieve detection of non-spontaneous event. Simulation results show that the intermediate result sharing mechanism effectively improve the efficiency of RFID complex event processing.Thirdly , Based on the method of ERD, this paper proposes a method GOM to solve the problem of timestamp out-of-order in the process of RFID event processing. The method introduces a special punctuation event OME, on this basis proposes the space collection algorithm which can delete invalid event instances safely, achieve to solve the problem of mistaken deletion of event instances. In addition, by improving the detection algorithm of non-spontaneous event in ERD method, proposes a anti-forgery detection algorithm AFD to solve the problem of forgery event caused by timestamp out-of-order. Simulation results show that the method has obvious advantages in terms of real-timing and efficiency of space collection.