The Research On The Key Technologies Of RFID In The Intelligent Logistics System

With the fast development of E-commerce in our country, the traditional way of logistics has becoming increasingly difficult to meet the needs of society. The concept of intelligent logistics comes into being in this background. It collects real-time information in various aspects of the logistic work through intelligent transport systems. The intelligent logistic system processes and analyzes that information in order to provide customers with value-added logistics services in the operating environment of e-commerce.Logistics systems generally use conventional bar code on the article to be tracked, but obviously it cannot meet the current demand of customers for more items, faster speed and higher service quality. RFID tag has a lager storage capacity than bar code and RFID technology has a fast, non-contact, multi-target reading and other technical advantages which is very helpful for reading and writing data to improve supply chain visibility, inventory turnover and quality of service for customers. Moreover, RFID has a better capability in anti-fake. So it is suitable for RFID to be applied in intelligent logistics system.Because RFID technology was originally a open technology which has consider little in security issues. This has limited RFID’s development. Intelligent logistics system consists of information related to much corporate information such as sales, personnel, finance, etc., and therefore needs a higher standard of security. This paper analyzes the RFID system security threats, sums up RFID system security requirements and the both advantages and disadvantages of existing security mechanisms, based on which, proposes a no server supporting RFID authentication protocol. The core technology of this protocol are hash function and bitwise-computing. It can be conducted simply but it can effectively resist attacks, providing good security and privacy. And this feature of no server supporting greatly helps intelligent logistics services in some of the applications far away from the server.Tags collision problem is another problem faced by the RFID system. Collision makes reading efficiency of the RFID slower and even leads to misread or missed tag, which limits the practical application of RFID technology. This paper summarize the current existing RFID tag anti-collision mechanism such as the space division multiplexing, frequency division multiplexing, code division multiplexing and time division multiplexing. Then focuses on the two time division multiplexing algorithm:Aloha-based probabilistic algorithms and binary tree deterministic based algorithms. On the basis of these two algorithms, this paper proposes a hybrid RFID query tree protocol, which reduces collision cycle through query algorithm and reduces the idle cycles by slots Aloha mechanism. Simulation experiment shows that it is useful to improve the reading efficiency of the RFID system.