Communication And Distance Measurements In An Addressed Wide Band RFID System
First Claim
1. In a radio frequency identification system of elements including at least one reader and a plurality of tags, including a first tag and a second tag, a method for communicating between the at least one reader and the tags, the method comprising:
- addressing a wide-band-message signal by including in said signal a first-tag identifier of the first tag, thereby producing an addressed wide-band-message signal with a destination being the first tag, along with other tag identifiers for respective other tags forming a first set of addressed tags;
transmitting said addressed wide-band-message signal by the reader;
waiting to receive by the first tag said addressed wide-band-message signal; and
upon receiving said addressed wide-band message signal and recognizing said identifier, detecting the presence of radio frequency activity in a time window and in the absence of said radio frequency activity responding to said addressed wide-band-message signal by transmitting by the first tag an addressed wide-band response signal and in the presence of said radio frequency activity during said time window waiting for a new time window to detect again for radio frequency activity.
4 Assignments
0 Petitions
Accused Products
Abstract
A method for communicating between elements including a reader and tags of a radio frequency identification system. The method includes addressing a wide-band-message signal by including in the signal an identifier of the first tag. The addressed wide-band-message signal is transmitted by the reader. A first tag waits to receive the addressed wide-band-message signal; and upon receiving the addressed wide-band-message signal and recognizing the identifier, the first tag responds to the addressed wide-band-message signal by transmitting an addressed wide-band response signal either back to the reader or to a relaying tag. The tag relays to another element of the system by transferring at least one datum of the query from the addressed wide-band-message signal to the addressed wide-band response signal, where the elements are readers or tags. The system and method allow for many parallel wide band addressed links, and for position determination using at least two tags with known locations.
9 Citations
29 Claims
-
1. In a radio frequency identification system of elements including at least one reader and a plurality of tags, including a first tag and a second tag, a method for communicating between the at least one reader and the tags, the method comprising:
-
addressing a wide-band-message signal by including in said signal a first-tag identifier of the first tag, thereby producing an addressed wide-band-message signal with a destination being the first tag, along with other tag identifiers for respective other tags forming a first set of addressed tags; transmitting said addressed wide-band-message signal by the reader; waiting to receive by the first tag said addressed wide-band-message signal; and upon receiving said addressed wide-band message signal and recognizing said identifier, detecting the presence of radio frequency activity in a time window and in the absence of said radio frequency activity responding to said addressed wide-band-message signal by transmitting by the first tag an addressed wide-band response signal and in the presence of said radio frequency activity during said time window waiting for a new time window to detect again for radio frequency activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 28)
-
-
17. In a radio frequency identification system of elements including at least one reader and a plurality of tags, wherein at least one of said elements includes a wide-band wireless transceiver comprising:
-
an addressing mechanism which addresses a wide-band message signal by including in said message signal an identifier of at least one element of the system, and thereby produces an addressed wide-band message signal, along with other tag identifiers for respective other tags forming a first set of addressed tags, and a transmitter which transmits said addressed wide band message signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 29)
-
-
24. In a radio frequency identification system of elements including at least one reader and a plurality of tags, a method for communicating between the elements using wide-band signals, the method comprising:
-
addressing at least one query from the reader to at least one of the plurality of tags; receiving the at least one query from the reader at one of the tags acting as a relaying element; relaying the at least one query from the relaying element to another element by transferring at least one datum of said at least one query from said relaying element to said another element, wherein said at least one query is carried in a single cell using said wide-band signals without causing interference with other tag communications. - View Dependent Claims (25, 26, 27)
-
Specification