Re: Improving RFID reader throughput!


Bill Knight wrote:
On 29 Aug 2006 07:53:20 -0700, "Ali" <abdulrazaq@xxxxxxxxx> wrote:


Folks,

I'm doing performance measurements on our MCU based RFID
reader. The very problem I'm facing is redundancy of tag ID (say 12
bytes) transmission, every time my MCU receives a tag ID; will just
push that ID to UART without any prior knowledge of that it is sending
the same ID again and again. (Due to poor designs of RFID tag protocols
single tag can response its ID repeatedly unless some other tag steps
in). Is it possible to implement some AI or data structure technique to
avoid that? And to decide that this tag id was pushed before so no use
to resend go-on to process another incoming IDs.

I just can't ignore the incoming tags while executing some complex
comparison or say search algorithm even assuming that I have 2K free
memory.


Thanks for your time
ali

Ali
What tag formats are you trying to read? If it is one or more of
the EPC Global formats, all of them (Class 0, Class 1, and Class 1 Gen
2) have a means within the protocol to silence a tag once it has
reported its ID. If it is some other tag protocol, I'm afraid I
cannot help you.

Reards
-Bill Knight
R O SoftWare


Hello Bill,
Our reader is supporting ISO 18000 Type B and C, where as we
are supporting Class 1 from Gen2. Well as a original developer of these
protocols I don't know if there is a way to make these tags silence!
But I remember there was a sleep command in Gen1.
Lets take an example of ISO Type B, do you think there is a way to make
these tags silence? Well if you say that using GROUP_SELECT_X commands
(where X is EQUAL , LESS or GREATER etc..) can solve the problem then
question is; what to do with tags that are exposed very first time to
reader?

And how about Gen2 say we are in inventory process how to do that? How
one can command the tags not to retransmit their IDs? my anti-collision
design is using Query(x)[Where x is less than equal to 15 and greater
than equal to 0] , QueryAdjust(x) [Where x is Q+1 , Q and Q-1] in a
loop


Thanks for your time and I'm glad that I got company here;-) can you
point some rfid related useNet places?

ali

.

Relevant Pages

  • Re: Government RFID busted
    ... What can one do with the tag? ... Also, the reader at ... The technology will transmit only a number between the card and the ... be no personal information written to the RFID chip." ...
    (Pen-Test)
  • new babe to RFID design want to ask some question
    ... RFID reader that can read ISO-18000-6 tag. ... Is directional coupler really used in a typical UHF RFID ...
    (rec.radio.amateur.antenna)
  • Re: Authentication Algorithm for embedded RFID device
    ... > I have a reader and a tag and I want to authenticate that the tag is an ... > original one (there is no need to authenticate the reader for the ... The secret number will be put in manufacturing. ...
    (comp.arch.embedded)
  • Authentication Algorithm for embedded RFID device
    ... I have a reader and a tag and I want to authenticate that the tag is an ... original one (there is no need to authenticate the reader for the ... The secret number will be put in manufacturing. ...
    (comp.programming)
  • Authentication Algorithm for embedded RFID device
    ... I have a reader and a tag and I want to authenticate that the tag is an ... original one (there is no need to authenticate the reader for the ... The secret number will be put in manufacturing. ...
    (comp.arch.embedded)