Information technology -- Automatic identification and data capture techniques -- Air interface specification for Mobile RFID interrogators

ISO/IEC 29143:2011 provides an air interface specification for Mobile radio frequency identification (RFID) interrogators being part of a passive backscatter system. This system comprises one or more mobile interrogators, also known as Mobile RFID interrogators, and an undefined number of tags, also known as labels.

Interrogators are not required to support channel sensing, i.e. do not need to implement Listen Before Talk (LBT), and transmit commands on the off chance under the risk of colliding with one or more peer-interrogators. Moreover, interrogators compliant to ISO/IEC 29143:2011 are not obliged to synchronize by any means (wired or wireless), i.e. no control channel dedicated to coordinating Time Division Multiplexing (TDM) is provided.

Tags are powered by the RF signal provided by the interrogator and respond to an interrogator by modulating the reflection coefficient of its antenna, thereby backscattering data to the interrogator. The working mode adopted by the tags is purely passive, i.e. tags do not actively initiate any kind of RF communication.

In ISO/IEC 29143:2011, collision arbitration and collision avoidance for Mobile RFID applications are defined by specifyi