Contributions To Several Issues Of Radio Frequency Identification Network Based On Peer-to-Peer Computing

Because of overcoming the traditional two-dimensional bar code technology which is vulnerability to pollution and needs to constraints such as line of sight to read, RFID technology (Radio Frequency Identification, RFID) has been concerned by both academia and industry research. Due to the simplicity of the early RFID application scenarios, academia and industry focus on the RFID data to obtain reliability, low-cost tags, tag and reader collision, the tag antenna technology and packaging technology, its application network architecture has been little studied. The deployment of RFID applications toward the development of large-scale, networked, distributed trend has brought new challenges to the RFID system architecture and RFID data management. RFID application architecture and RFID data processing can not meet the large-scale distributed network of RFID system needs. How to deal with massive RFID data collected from multiple readers in distributed RFID network, and extract RFID data which are interested by people from these huge amounts of data has become a key issue for RFID enterprise applications.Aiming at demanding for networked RFID application, this thesis focuses on the contents of the integration of P2P computing technology for RFID network, making full use of the advantages of P2P technology, which has load balancing, scalability, etc. The RFID network reader system, redundancy readers removed, tracking, object name services and security exist in current RFID network application using P2P computing technology to solve.The main contributions of this paper are as follows:(1) Propose a new P2P-RFID reader network system architecture, which extends the reading distance between the tag and the RFID reader system, and improve the multi-tag read speed;(2) Propose a coverage-based RFID network redundancyelimination algorithm, and also propose a reliability-based RFID network reader redundancy elimination optimization model, which uses the ant colony optimization algorithm for solving the optimization model. Simulation results show the effectiveness of the proposed algorithms and models;(3) Build RFID tracking network model, propose a new RFID data processing model, and then propose a P2P-based RFID network tracking recognition algorithm; With use of the spatial continuity of the Hilbert curve, propose a new distributed hash table (H2Chord) structure, by analyzing and comparisons, H2Chord has better performance than that of Chord in lookup performance. In addition, H2Chord RFID tracking network analysis and experimental results show that the proposed H2Chord can improve the query efficiency of the RFID tracking network and reduce the network load; provide the foundation for developing large-scale distributed environment using the P2P-based RFID tracking network applications;(4) Present a P2P-based ONS, which provides RFID tag’s object name service based on the super-node P2P network; H2Chord algorithm is proposed for data storage and search algorithms on the ONS network. Experimental results show that the mentioned P2PONS mechanism has advantages of load balancing, scalability, and tolerate a single point of failure;(5) Design and implement a P2P-based RFID network of smart materials management prototype system. In the implementation of the system, we use mobile agent to realize P2P communications and interaction with RFID system, which has the task of asynchronous execution, reduce network load, robustness, parallel processing, and intelligent routing features. Among agent-based P2P-RFID middleware technology, we can see the implementation system can be well compatible with the automatic acquisition of the items of information, automatic processing and exchange and sharing, as well as goods tracking, traceability of goods, thus to achieve intelligent materials, visualization and safety management.