Cmiljanic Nikola, Landaluce Hugo, Perallos Asier, Arjona Laura
DeustoTech-Fundación Deusto, Avda. Universidades, 24, 48007 Bilbao, Spain.
Faculty of Engineering, University of Deusto, Avda. Universidades, 24, 48007 Bilbao, Spain.
Sensors (Basel). 2017 Aug 17;17(8):1891. doi: 10.3390/s17081891.
In recent years, Radio Frequency Identification (RFID) has become very popular. The main feature of this technology is that RFID tags do not require close handling and no line of sight is required between the reader and the tags. RFID is a technology that uses radio frequencies in order to identify tags, which do not need to be positioned accurately relative to the reader. Tags share the communication channel, increasing the likelihood of causing a problem, viz., a message collision. Tree based protocols can resolve these collisions, but require a uniform tag ID distribution. This means they are very dependent of the distribution of the IDs of the tags. Tag IDs are written in the tag and contain a predefined bit string of data. A study of the influence of the tag ID distribution on the protocols' behaviour is proposed here. A new protocol, called the Flexible Query window Tree (FQwT) is presented to estimate the tag ID distribution, taking into consideration the type of distribution. The aim is to create a flexible anti-collision protocol in order to identify a set of tags that constitute an ID distribution. As a result, the reader classifies tags into groups determined by using a distribution estimator. Simulations show that the FQwT protocol contributes to significant reductions in identification time and energy consumption regardless of the type of ID distribution.
近年来，射频识别（RFID）变得非常流行。这项技术的主要特点是RFID标签不需要近距离操作，并且读写器与标签之间不需要视线接触。RFID是一种利用射频来识别标签的技术，标签无需相对于读写器精确放置。标签共享通信信道，增加了引发问题的可能性，即消息冲突。基于树形的协议可以解决这些冲突，但需要标签ID均匀分布。这意味着它们非常依赖于标签ID的分布情况。标签ID写入标签中，包含预定义的数据位串。本文提出了一项关于标签ID分布对协议行为影响的研究。提出了一种名为灵活查询窗口树（FQwT）的新协议，以考虑分布类型来估计标签ID分布。目的是创建一种灵活的防冲突协议，以便识别构成ID分布的一组标签。结果，读写器使用分布估计器将标签分类成组。模拟表明，无论ID分布类型如何，FQwT协议都有助于显著减少识别时间和能耗。
