Tag collision is one of the most important issues in RFID systems and many tag anti-collision protocols were proposed in literature. But some kind of these protocols like Tree-based protocols (specifically Query tree) which its performance depends on tag ID length and construction, have some issues like ID distribution. In this paper we discuss about Query tree protocol which may influenced by ...

Article history: Received 25 January 2014 Received in revised form 12 March 2014 Accepted 14 April 2014 Available online 25 April 2014

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With RFID technology being applied in more and more applications nowadays, many researchers have focused on how to manage and analyze RFID data efficiently. Obviously, location information, which is an important part of RFID data, has the characteristic of multiple conceptual levels. Existing methods of RFID data management mainly deal with the cases of non-hierarchy (single hierarchy) or multi...

Kyle Rector, Evan Welbourne, Magdalena Balazinska University of Washington School of Computer Science and Engineering Seattle, Washington 98195 {rectorky, evan, [email protected]}

In a multi-reader environment, RFID system performance will be limited by the reader collision problem. RFID readers use different channels to minimise collision. However, with limited channels, the in-channel collision will happen. Using a path loss model, this paper predicts the safe distance between the readers before collisions occur in a same channel. This paper also explores the complicat...