RFID tag and communication protocol for long range tag communications and power efficiency
AssigneeHoneywell International Inc.
InventorsRobert C. Becker, David W. Meyers, Sabera Kazi
Life of this patent
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Abstract
An RFID tag has a frequency agile RF transceiver that transmits data from the RFID tag to a reader and a direct sequence spread spectrum RF receiver that receives communications from the reader. Messages between the reader and the RFID tag are divided into frames, and each frame contains a frame header transmitted by the reader and at least one time slot containing data transmitted by the RFID tag. The frame header contains a hop sequence and a frequency in a hop sequence to be used by the RFID tag in transmitting data to the reader.
Claims29
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.
A method of transmitting information contained in a plurality of frames between a reader and a plurality of tags comprising:
- transmitting a frame header in each of the frames from the reader to the tags;
- and
- transmitting a slot header in each of the time slots from the reader to the tags, wherein each of the slot headers contains a frequency in a hop sequence to be used in transmitting data from the tags to the reader.
Dependencies are inferred from the claim text.