5. Anti-collision protocols
In RFID, collisions can be classified into three categories:
collision tags to interrogator. These collisions occur when several tags are in the area illuminated by an interrogator and attempt to respond (simultaneously) to the interrogator's commands;
collision between interrogators and tags. In this case, an RFID tag is in the interrogation zone of several readers. The tag then tries to respond to several requests, which may be contradictory. The most likely result is that the tag becomes undetectable by the interrogators;
interrogator-to-interrogator collisions. This is "classic" interference between several transmitters seeking to use the same radio resource. The methods used to avoid this type of collision are frequency-hopping spread spectrum (FHSS), listen-before-talk...
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Anti-collision protocols
Encoding passive UHF RFID tags
Bibliography
Standards and norms
- Information Technology – Radio frequency identification (RFID) for object management – Part 7: Active communications parameters for a 433 MHz radio interface. - ISO/IEC 18000-7 - 2014
- Information technology – Radio frequency identification for item management – Part 4 : Parameters for air interface communications at 2,45 GHz. - ISO/IEC 18000-4 - 2015
- IEEE Standard For Low-Rate Wireless Personal Area Networks...
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3M : http://www.3m.com
Alien technology: http://www.alientechnology.com
ASK : http://www.ask-rfid.com
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