Recent
research has been focused on ?¬?nding solutions for some of these issues. To overcome
privacy concerns, research groups have proposed novel solutions such as blocker tags [15]
and authentication using novel encryption techniques [16]. A survey of the state of RFID
security can be found in Chapter 33. Recent advancements in tag hardware contribute to
improved range and power consumption [17], improved tag antenna design [18,19],
packaging, and tag orientation. For the performance characterization of the RFID systems
under active interference, a test protocol has been presented by Porter et al. [20] and its
effectiveness is veri?¬?ed. For RFID readers, a solution is developed for the problem of Tx=Rx
isolation at the physical layer [21].
The existence of multiple RFID standards calls for comparative studies that can help
the end user in choosing the suitable approach for implementing the communication
between interrogator and tag. There has been some previous work discussing the features
of the ISO 18000 Part 6C (previously Gen 2) protocol and their implications for asset
management [22]. The features discussed are tag memory, security techniques, operational
modes, communication methods, global applicability, and other improvements with
respect to the EPC class 0 and class 1 generation 1 protocols. The necessity for a uniform
organization of user memory and the related omissions in the EPC protocols are addressed
by Harmon [23].
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