Method and device for obtaining item information using RFID tags
First Claim
1. A method for obtaining from an item information source item information relating to an item, said item having associated therewith an item identification means providing item identification information and an RFID response means arranged to provide a predetermined RFID response on being subjected to a currently applicable RFID trigger signal;
- said method comprising;
establishing from said item identification means item identification information;
using said item identification information to determine from said item information source a currently applicable RFID trigger signal for said RFID response means;
subjecting said RFID response means to said currently applicable RFID trigger signal;
receiving a predetermined RFID response from said RFID response means; and
using said predetermined RFID response to obtain item information from said item information source;
wherein the RFID response means is arranged to generate a new currently applicable RFID trigger signal and a new predetermined RFID response associated therewith following the subjecting of said RFID response means to said currently applicable RFID trigger signal;
wherein the RFID response means and the item information source are each arranged to generate the new currently applicable RFID trigger signal in step with one another by performing at least one of the following;
selecting and using a next member from a predetermined sequence of currently applicable RFID trigger signals;
applying a predetermined one-way function or hash-function to the currently applicable RFID trigger signal; and
applying a pseudorandom function to the currently applicable RFID trigger signal; and
wherein the RFID response means and the item information source are each arranged to generate the predetermined RFID response associated with the new currently applicable RFID trigger signal in step with one another by performing at least one of the following;
selecting and using a next member from a predetermined sequence of predetermined RFID responses;
applying a predetermined one-way function or hash-function to an existing predetermined RFID response; and
applying a pseudorandom function to an existing predetermined RFID response.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and devices for enabling a user to obtain item information relating to an item (10), the item having associated therewith an item identification means (12) and an RFID response means (14) arranged to provide a predetermined response on being subjected to a currently applicable trigger signal; the method comprising steps of: establishing from the item identification means (12) item identification information; using the item identification information to determine from an item information source (30) a currently applicable trigger signal for the RFID response means (14); subjecting the RFID response means (14) to the currently applicable trigger signal; receiving a predetermined response from the RFID response means (14); and using the predetermined response to obtain item information from the item information source (30); wherein the RFID response means (14) is arranged to generate a new currently applicable trigger signal and a new predetermined response associated therewith following subjecting of the RFID response means (14) to the currently applicable trigger signal.
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Citations
24 Claims
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1. A method for obtaining from an item information source item information relating to an item, said item having associated therewith an item identification means providing item identification information and an RFID response means arranged to provide a predetermined RFID response on being subjected to a currently applicable RFID trigger signal;
- said method comprising;
establishing from said item identification means item identification information; using said item identification information to determine from said item information source a currently applicable RFID trigger signal for said RFID response means; subjecting said RFID response means to said currently applicable RFID trigger signal; receiving a predetermined RFID response from said RFID response means; and using said predetermined RFID response to obtain item information from said item information source; wherein the RFID response means is arranged to generate a new currently applicable RFID trigger signal and a new predetermined RFID response associated therewith following the subjecting of said RFID response means to said currently applicable RFID trigger signal; wherein the RFID response means and the item information source are each arranged to generate the new currently applicable RFID trigger signal in step with one another by performing at least one of the following; selecting and using a next member from a predetermined sequence of currently applicable RFID trigger signals; applying a predetermined one-way function or hash-function to the currently applicable RFID trigger signal; and applying a pseudorandom function to the currently applicable RFID trigger signal; and wherein the RFID response means and the item information source are each arranged to generate the predetermined RFID response associated with the new currently applicable RFID trigger signal in step with one another by performing at least one of the following; selecting and using a next member from a predetermined sequence of predetermined RFID responses; applying a predetermined one-way function or hash-function to an existing predetermined RFID response; and applying a pseudorandom function to an existing predetermined RFID response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- said method comprising;
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13. A device for enabling a user to obtain from an item information source item information relating to an item, said device comprising an item identification means for providing item identification information, and an RFID response means, wherein:
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said item identification means comprises means from which can be established item identification information in dependence on which a currently applicable RFID trigger signal for said RFID response means can be determined from said item information source; and said RFID response means comprises means arranged to provide a predetermined RFID response on being subjected to said currently applicable RFID trigger signal, in dependence on which predetermined response item information can be obtained from said item information source; said RFID response means further comprising means arranged to generate a new currently applicable RFID trigger signal and a new predetermined RFID response associated therewith following the subjecting of said RFID response means to said currently applicable RFID trigger signal; said RFID response means being arranged to generate the new currently applicable RFID trigger signal in step with said item information source by performing at least one of the following; selecting and using a next member from a predetermined sequence of currently applicable RFID trigger signals; applying a predetermined one-way function or hash-function to the currently applicable RFID trigger signal; and applying a pseudorandom function to the currently applicable RFID trigger signal; and wherein said RFID response means is arranged to generate the predetermined RFID response associated with the new currently applicable RFID trigger signal in step with said item information source by performing comprises means arranged to perform at least one of the following; selecting and using a next member from a predetermined sequence of predetermined RFID responses; applying a predetermined one-way function or hash-function to an existing predetermined RFID response; and applying a pseudorandom function to an existing predetermined RFID response. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification