An RFID system comprises at least one reading device (1) and at least one transponder (2, 2′, 2″, 2′″), which are configured for non-contact communication by means of modulated electromagnetic signals (SS), which contain data and/or commands packed in data frames, in which the reading device...http://www.google.fr/patents/US8036329?utm_source=gb-gplus-shareBrevet US8036329 - Sychronization during anti-collision
