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  1. #1
    Registered User
    Join Date
    May 2008
    Posts
    17

    Does NFC tag protocol support anti collision

    Hi,

    please if you have answer let we know.

    I will use Nokia 6131 NFC as RFID reader (because high price of RFID reader,and another issue).

    My question is:

    Does NFC tag protocol avoid collision i.e Nokia 6131 NFC can read all tags that exist around it.

    another Question:
    How many tags can be readied at the same time ?

    for example:
    some RFID reader support EPC Gen2 class A/B tag protocol ,this protocol guarantee that no collision will occur(that what i know)

  2. #2
    Regular Contributor
    Join Date
    Jan 2008
    Posts
    173

    Re: Does NFC tag protocol support anti collision

    Question #1: NFC devices use Single Device Detection through time slots, so yes: it can

    Question #2: Don't know

  3. #3
    Registered User
    Join Date
    May 2008
    Posts
    17

    Re: Does NFC tag protocol support anti collision

    thanks alixwarnke

    thus if there are more than one tag surrounding the cell phone
    ,cell phone can read all of them at the same time?

    or i must near cell phone to each tag individually?

  4. #4
    Regular Contributor
    Join Date
    Jan 2008
    Posts
    173

    Re: Does NFC tag protocol support anti collision

    Hello again!
    NFC is point-to-point so: one at a time, however you can browse the detected tags until you find what you are looking for and then establish a connection.
    Last edited by alixwarnke; 2008-05-17 at 16:00.

  5. #5
    Nokia Developer Expert
    Join Date
    Dec 2003
    Posts
    113

    Re: Does NFC tag protocol support anti collision

    It depends completely on the technology. Some tags will work nicely together with anticollision, and some don't. E.g. Type 3 and Type 4 are detected in different stages of polling, so you will only pick one or the other.

    So you will need to try it out...

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