Radio frequency identification readers, methods and computer program products for adjusting a query command slot-counter parameter Q

摘要

RFID readers and methods for adjusting a query command slot-count parameter Q for use by radio frequency identification (RFID) tag reader in an RFID tag inventory round are provided. A method for adjusting a query command slot-count parameter Q for use by an RFID tag reader includes setting an initial value for Q for a first inventory round, issuing a query command to a population of RFID tags, and monitoring replies from the population of RFID tags. The value of Q is decreased by a first amount if no reply is received, and the value of Q is increased by a second amount different from the first amount if a tag collision reply is received.

主权项

1. A method, comprising: setting, via a processor, an initial value for a query command slot-count parameter for a first inventory round; issuing, via the processor, a query command comprising the initial value for the query command slot-count parameter to a plurality of radio frequency identification tags; identifying, via the processor, replies from the plurality of radio frequency identification tags; and adjusting, via the processor, the initial value of the query command slot-count parameter for use in a second inventory round by a first amount if no reply is received for the query command that is issued, and by a second amount different from the first amount if a tag collision reply is received for the query command that is issued, wherein the second amount is a lesser of 1.0 and a value of a formula (0.1)*(Ave_Tcoll/Ave T_idle), wherein Ave_Tcoll is an average duration of a collided reply from the plurality of radio frequency identification tags, and wherein Ave_Tidle is an average duration of no reply from the plurality of radio frequency identification tags, wherein the Ave_Tcoll is in the range of 581 microseconds to less than 1456 microseconds.