×

Tag communication protocol & system

  • US 6,329,944 B1
  • Filed: 05/12/2000
  • Issued: 12/11/2001
  • Est. Priority Date: 05/12/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of establishing communication between a radar and an RF tag having a sleep stage and a scan stage, the method comprising the steps of:

  • a) alternating the RF tag between the sleep stage and the scan stage;

    b) transmitting a wake-up call to the RF tag via the radar;

    c) receiving the wake-up call from the radar when the RF tag is in the scan stage;

    d) transmitting a downlink message to the RF tag via the radar;

    e) sending an uplink message to the radar via the RF tag upon receipt of the downlink message; and

    f) returning the RF tag to the sleep stage.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×