RFID group selection method

摘要

The invention describes a selection and arbitration method for reading a population of RFID transponders (tags). The transponders are selected or de-selected individually, or in one or more groups, using one or more command signals from a reader. The command signals from the reader include selection or de-selection criteria for selecting or de-selecting transponders by moving them between different states by setting or resetting a command flag, such as a flip-flop, in the transponders. The different transitional states include a Ready state, an Active state, a Standby state, a Singulated state and a Quiet state.

主权项

1. A method of selecting or de-selecting one or more groups of transponders, using a selection process comprising one or more select commands from an interrogator, the one or more groups of transponders being within a field of interrogation, the method comprising:
transmitting from the interrogator a select command that includes selection or de-selection criteria of the one or more groups of transponders, whereby if a transponder meets selection or de-selection criteria in the select command, the transponder is selected or deselected while remaining in a first state; and transmitting from the interrogator at least one arbitration command, wherein the at least one arbitration command comprises a select parameter, wherein transponders within the one or more groups of transponders participate in an arbitration sequence, by transitioning from the first state to a second state to transmit a reply, in response to the at least one arbitration command and in an instance in which the transponder is selected and the select parameter is set to selected, and wherein transponders within the one or more groups of transponders participate in an arbitration sequence, by transitioning from the first state to a second state to transmit a reply, in response to the at least one arbitration command and in an instance in which the transponder is deselected and the set parameter is set to deselected.