Research Of Key Technologies In RFID Middleware Which Based On Event-Driven Model

RFID (Radio Frequency Identification), which is also called radio frequency identification technology, has been a long time, in-depth, large-scale applied to all areas of social and natural sciences. It grows towards maturity in many directions and applications. Such as logistics, intelligent transportation, animal tracking research, asset tracking, access control of multiple insurance system, small-scale positioning system, various industries (such as canteens, supermarkets, public transport) pament system and the direction of military goods transportation and many other applications. Along with the hardware technology continuously updating, non-contact identification model solution from the original high-frequency-based hardware technology gradually extended to ultra-high frequency-based hardware technology. HF RFID tags typically have the operating frequency of 13.56MHz, mostly are passive tags, that means tag needs to get into the readable region to get electric energy from the power of reader. Reading distance of high-frequency RFID tag is less than 1 m,that's suitable for access control cards, public transportation card applications, etc.. Working frequency of UHF RFID is between 860MHz to 960MHz, and inclueds active tags and passive tags, active tag has battery inside to supply the energy to interact with reader. Under UHF RFID reader, the passive tag's read range can be 10 meters and it's suitable for the supply chain applications and production line automation applications.As RFID technology becomes more widespread, protocols of products based on RFID technology are various, and readers are in a wide range, in this case, a relatively unified RFID middleware protocols: EPCglobal ALE middleware protocol is released. ALE middleware protocol is designed to shield the differences between the various card readers, making different types of readers working together and having efficient interaction and co-operation between readers possible. ALE middleware protocol would also like to filter, integration, packaging the data and then unified provide interfaces to the upper layer, that allows the upper layer can subscribe or receive packaged data in real-time through the interface. In this article, there will be detailed and specific elaboration in the specific details of the ALE protocol, an innovative extension of the agreement, the ALE middleware protocol implementations, and event-driven model theory. In the middleware implementation issues, this paper conducted in-depth discussion, focusing on presentation of the AC, EC, LR, TM, CC concrete realization of these five modules and the way to manage a lot of the details of the technical elaboration and clarification. In addition to the five modules, they also need necessary modules to help all the major functional implementations. For instance,Middleware trigger realized by the JAVA timer technology, event-driven model and read and write controls of card reader applied the state transition model, using rights of middleware interfaces used secure access mode of EJB management application. For the reader of management, we have extended a new module, this module seamlessly converge on the LR module,and becomes a module which actually interact with the physical readers, this module is designed to be extendible, which is good for the future facilitating of Reader Network program implementation. Currently, different high-frequency of RFID technology products generally set different protocol interface, and there are no protocols and layered basic concepts of some products, which has led to interaction of all levels(such as interactions between physical reader and software business logic) mixed together, it's bad for the entire system, maintainability and extendibility. In this paper, while discussing the idea of the software layer, we also proved the applicability of standardization of high-frequency RFID technology development.For the differences between the various readers, ALE middleware has done a very good integration. but each layer of enterprise business differences still exist, and there are satuations such as a number of businesses between enterprises, the internal data can be open and ways of businesse handling are similar between enterprises. In concern of these satuations, over ALE middleware protocols, EPCglobal gives an EPCIS protocol which is related to the businesses of enterprises. Company each has its own reader, data, and can share resources. Under the EPCIS specification protocol, the various companies joined a EPCIS network, which is a hardware guarantee of checking and updating data on the supply chanin.Enterprises can do longitudinal data access through the interfaces provided by EPCIS protocol, so the coupling of data exchange between enterprises could be reduced. In addition, EPCIS can be extended in senior complex queries, high level of data integration, data mining and complex event-driven processing model, etc.. This article will introduce the basic EPCIS protocol and on this basis, some innovative ideas would be put forward: under the business relevant EPCIS protocol, the applications of some creative extension, complex event handling and data mining theorys in EPCIS extension are necessary. For the actual work time complex event processing of Staff Attendance System, an improved clustering method of data mining application is proposed in this paper. we are inclined to make the attendance system more intelligent and more human.After discusions of the middleware theory and the theory of complex event processing, this article would be led to an application-oriented system to apply the theory discussed by the aim to better interpretation of the various theoretical innovation we discussed. The application system is a credit card attendance system. It has now been put into small-scale normal use. the system is based on ultra-high frequency RFID reader system, informations could be get when cardholders walk through the readable region. The system also extended the protocol, solved problems such as: handling of duplicate reading when the tag is in readable area, the judgement of tag in and tag out, etc.. This article also researched on complex problem such as the actual calculation of-the-job time, statistics of activity level of staff through the study of EPCIS protocol.This paper presents a idea of high-frequency RFID technology development standardization and internationalization,makes the actual application system,and also puts forward new and improved methods for the deficiencies of the system.More over, according to the characteristics of the project, we put forward a cutting-edge idea of data mining which is rarely concerned in attendance checking system. The current attendance checking system has some problem in information collection and analyzing. The direct result of the problem is causing the differeces between the real situation and the data. In this paper, we use UHF RFID technology to frequently sample information on the activities of employees in distance. Then we use data mining technic to analyze the massive information. And then we can make the results be closed to the real situations.In summary, in this paper, we implemented the middleware according to one of the international protocols. Then we put the middleware in use and we proposed an idea of analyzing informations using data mining.