Local processing of received RFID tag responses
First Claim
1. An RFID reader system for receiving and processing RFID tag responses, comprising:
- a first layer; and
a second layer, in which the first layer is configured to;
receive a postselect mask from the second layer;
inventory a tag population at a transmit power;
receive a tag response;
if the response does not meet a preselect criterion, then discard the response;
elsereport the response; and
apply a postselect criterion by comparing the response to the postselect mask;
if the response meets the postselect criterion thenpause the inventory and handing off control from the first layer to the second layer;
receive instructions from the second layer; and
if the instructions include performing an access operation on the tag, then;
determine an amount by which to increase the transmit power for the access operation;
increase the transmit power by the determined amount;
perform the access operation based on the instructions;
then decrease the transmit power;
then continue to inventory the tag population.
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Abstract
Radio frequency identification (RFID) tags are selected for inventorying using a combination of preselect and/or post select criteria. The selection commands can be for selecting according to a tag memory content, by invoking the mask address or by comparing other tag characteristics. Selection criteria can be determined locally at a modem block of a reader or provided to the modem block by higher layers of the reader. Tags meeting the selection criteria are reported to the higher layers for further actions. Some tags may be held while waiting for instructions from the higher layer block(s). The instructions may involve one or more access operations, which may be performed using a higher transmit power than other operations.
15 Citations
18 Claims
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1. An RFID reader system for receiving and processing RFID tag responses, comprising:
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a first layer; and a second layer, in which the first layer is configured to; receive a postselect mask from the second layer; inventory a tag population at a transmit power; receive a tag response; if the response does not meet a preselect criterion, then discard the response;
elsereport the response; and apply a postselect criterion by comparing the response to the postselect mask; if the response meets the postselect criterion then pause the inventory and handing off control from the first layer to the second layer; receive instructions from the second layer; and if the instructions include performing an access operation on the tag, then; determine an amount by which to increase the transmit power for the access operation; increase the transmit power by the determined amount; perform the access operation based on the instructions; then decrease the transmit power; then continue to inventory the tag population. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a first layer of a multilayer RFID reader system to process a plurality of received RFID tag responses, the method comprising:
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receiving a postselect mask from a second layer; inventorying a tag population at a transmit power; receiving a response from a tag; if the response does not meet a preselect criterion, then discarding the response;
elsereporting the response and applying a postselect criterion by comparing the response to the postselect mask; if the response meets the postselect criterion then pausing the inventory and handing off control from the first layer to the second layer; receiving control and instructions back from the second layer; and if the instructions include performing an access operation on the tag, then; determining an amount by which to increase the transmit power for the access operation; increasing the transmit power by the determined amount; performing the access operation on the tag based on the instructions; then decreasing the transmit power; then continuing to inventory the tag population. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification