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RFID tag and communication protocol for long range tag communications and power efficiency

  • US 7,401,740 B2
  • Filed: 03/09/2006
  • Issued: 07/22/2008
  • Est. Priority Date: 09/05/2002
  • Status: Expired due to Fees
First Claim
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1. An electrical signal transmitted between a reader and RFID tags, wherein the electrical signal contains a message divided into frames, wherein each frame contains a frame header transmitted by the reader and a plurality of time slots, wherein at least one of the time slots contains data transmitted by a corresponding RFID tag, wherein each of the time slots in a frame comprises a slot header, wherein each of the slot headers contains a frequency in a hop sequence to be used by at least one of the RFID tags in transmitting data, and wherein the frame header contains a frequency in a hop sequence to be used by at least one of the RFID tags in transmitting data.

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