RFID readers transmitting preambles denoting communication parameters and RFID tags interpreting the same and methods
First Claim
Patent Images
1. An RFID reader adapted to at least:
- transmit to an RFID tag a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion that encodes a first communication parameter other than a transmission data rate of the reader; and
then exchange data with the tag according to the first communication parameter.
1 Assignment
0 Petitions
Accused Products
Abstract
RFID readers transmit data to query RFID tags. Before transmitting the data, the RFID readers also transmit special preambles that inform of parameters of communication that are to be used. RFID tags decode the preamble, and adjust accordingly to optimize the communication. The preambles of the invention start with a delimiter that has a substantially constant duration regardless of the communication parameters that will be used, such as transmission data rate.
-
Citations
123 Claims
-
1. An RFID reader adapted to at least:
-
transmit to an RFID tag a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion that encodes a first communication parameter other than a transmission data rate of the reader; and
then exchange data with the tag according to the first communication parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A device comprising:
-
means for transmitting to an RFID tag a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion that encodes a first communication parameter other than a transmission data rate of the reader; and
means for exchanging data with the tag according to the transmitted first communication parameter. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
-
-
43. A method for an RFID reader, comprising:
-
transmitting to an RFID tag a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion that encodes a first communication parameter other than a transmission data rate of the reader; and
then exchanging data with the tag according to the first communication parameter. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
-
-
64. An RFID tag adapted to at least:
-
receive from an RFID reader a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion;
decode from the protocol portion a first communication parameter other than a transmission data rate of the reader; and
then exchange data with the reader according to the decoded first communication parameter. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83)
-
-
84. A device comprising:
-
means for receiving from an RFID reader a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion;
means for decoding from the protocol portion a first communication parameter other than a transmission data rate of the reader; and
means for exchanging data with the reader according to the decoded first communication parameter. - View Dependent Claims (85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103)
-
-
104. A method for an RFID tag, comprising:
-
receiving from an RFID reader a preamble that includes a delimiter portion of a duration substantially equal to a preset delimiter duration, and a protocol portion;
decoding from the protocol portion a first communication parameter other than a transmission data rate of the reader; and
then exchanging data with the reader according to the first communication parameter. - View Dependent Claims (105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123)
-
Specification