The Research Of RFID Network Based On Publish/Subscribe System

In recent years, RFID has been widely applied to logistics, retail, transportation system.Early RFID application mostly use data centric model, all labels in network has been centralized to a few nodes,and on these nodes to storage and process, this greatly limits the treatment efficiency of the whole system. Because RFID system need the large-scale popularization and application,we must construct it in large distributed system. Large distributed system require each node can handle complex business events, and will sharing data which have processed with high speed in the network. This requires the nodes should not only have a middleware which can deal with complex events, but also have a message routing mechanism which can accurately delivery of processed events to the client with high speed. Due to publish/subscribe features asynchronous,distributed,loose coupling, and many-to-many communications, it is a suitable method for large-scale distributed computing and communication. In order to meet the needs of practical RFID application, this paper puts forward the RFID network architecture based on publish/subscribe system, and make further analysis and discussion about the key theory and method.This paper make the main work as follows:1. Put forward the RFID network architecture based on publish/subscribe systemThis paper give some related definitions and key descriptions of the RFID network model, emphatically discusses the events agency node in the overlay network, it is the basic component of network, it is not only the event handling middleware,which is to filter, polymerize and count labels, but also is a message router, which is responsible for forward the events that has been processed to interest subscribers. The main purpose of this paper is to make RFID network basing on publish/subscribe system accurately and efficiently process and transmit events, through the realization of the complex event handling middleware and efficient routing algorithm.2. The structure, function and realization of the event handling middlewareEvent agency middleware is the core component of RFID network. This paper design and develop a RFID middleware system, the system realized collection and treatment of events, analyse and conclude original labels data into complex events, eventually submit useful data to overlay network.The development of middleware system is based on OSGI Equinox, this technology can not only apply the middleware in a distributed network, but also organize various modules loose coupling and easy to unified management. The complex events middleware processing by the use of the technology of event processing engine Esper, it support for complex business events of the filter, detection and classification. Through the system function and performance tests, the results show that the middleware system realize functions of event filtering and complex events processing.3. Put forward the routing algorithm of RFID networkThe paper constructs the logic layer structure and model of RFID network, in the bottom network use Chord loop which can organize event agency node, in the top network use content routing algorithm base on rally point, which can avoid global message broadcast. Upon this mode, this paper design and realize the key publish/subscribe routing algorithm. Through the experiment shows that the publish/subscribe routing algorithm improve the traditional routing algorithm, meanwhile,assure efficiency and lasting performance of the network communication.