Patent ID: 7423535

Claim:
A method for monitoring one or more objects each having an RFID device associated therewith, said method comprising: transmitting at least two messages at different respective power levels from the RFID device, wherein each of the at least two messages includes information uniquely identifying the RFID device and information representing the power level at which the message is transmitted; relaying the at least two messages transmitted by each RFID device to a processor; and processing the relayed messages for determining the location of each RFID device, said processing comprising: processing the unique identifying information and the power level information from each relayed message for associating the relayed messages from each RFID device and the power level thereof, and selecting the relayed messages from a particular RFID device that are at the lowest power level that produces at least two corresponding relayed messages for determining the location of that particular RFID device and its associated object therefrom.