Method for RF card detection in a contactless system

Details Method for RF card detection in a contactless system Method for RF card detection in a contactless system

2007-09-25

2007-09-25

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S010100, C340S010400, C340S572200, C340S572400, C235S451000

Reexamination Certificate

active

11051015

ABSTRACT:
A method and processor-readable storage medium for performing the method of identifying RF cards in a card reader's field. Polling requests are sent to cards in a card reader's field. Where a clear response from the sent command is received from a responding card, the response is saved, the responding card moved to an Active state, and the timeslot number incremented if possible and the above steps repeated until no clear response is received. Where no clear response is received, a determination of whether a collision has occurred is made. If no collision occurred, the timeslot number is incremented; if a collision did occur, another polling request is sent. Discovered cards are returned when no cards or collisions are detected after every timeslot is polled.

REFERENCES:
patent: 5698837 (1997-12-01), Furuta
patent: 6354500 (2002-03-01), Gercekci et al.
patent: 6388562 (2002-05-01), Takiguchi et al.
patent: 6469618 (2002-10-01), Gaultier
patent: 6690263 (2004-02-01), Grieu
patent: 2004/0116074 (2004-06-01), Fujii et al.
STMicroelectronics Datasheet, “SRIX4K”, Apr. 2004, pp. 1-43.
ISO/IEC 14443-3 standard, Part 3: Initial-ization and Anticollision, Jun. 11, 1999, pp. 1-44.

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