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ISO/IEC 18000-3:2015 specifies the physical and logical requirements for a passive-backscatter, Interrogator-Talks-First (ITF) systems. The system comprises Interrogators, also known as readers, and tags, also known as labels. An Interrogator receives information from a tag by transmitting a continuous-wave (CW) RF signal to the tag; the tag responds by modulating the reflection coefficient of its antenna, thereby backscattering an information signal to the Interrogator. The system is ITF, meaning that a tag modulates its antenna reflection coefficient with an information signal only after being directed to do so by an Interrogator.
In detail, ISO/IEC 18000-3:2015 contains Type C.
Type C uses PIE in the forward link and a random slotted collision-arbitration algorithm.
ISO/IEC 18000-3:2015 specifies
- physical interactions (the signalling layer of the communication link) between Interrogators and tags,
- logical operating procedures and commands between Interrogators and Tags,
- the collision arbitration scheme used to identify a specific tag in a multiple-tag environment,
- optional security commands that allow the use of crypto suites of ISO/IEC 29167.