Method and apparatus for discrimination of RFID tags

• US 9,213,872 B2
• Filed: 02/18/2010
• Issued: 12/15/2015
• Est. Priority Date: 02/18/2010
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Nokia Technologies Oy (Nokia Corporation)
• Inventors: Karttaavi, Timo Petteri, Hakala, Ilkka Hermanni
• Primary Examiner(s): BEE, ANDREW W.
• Application Number:
  US13/579,558
• Publication Number:
  US 20120319821A1
• Time in Patent Office: 2,126 Days
• Field of Search: 340/10.1, 340/10.2, 340/10.3, 340/10.4, 340/10.5, 340/539.11
• US Class Current: 1/1
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10019 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. collision between the communication channels used by wireless communication devices, where the solution is not particularly adapted for RFIDs or the like, H04W74/08
• CPC Class Codes: G06K 7/10089 the interrogation device using at least one directional antenna or directional interrogation field to resolve the collision direction or location finding, such as triangulation techniques, G01S13/00
• CPC Class Codes: G06K 7/10346 the antenna being of the far field type, e.g. HF types or dipoles

Abstract

In one or more embodiments described herein, there is provided an apparatus that is configured to determine respective signal strengths of radio frequency identification signalling received from multiple sources by a directional antenna. The apparatus is also configured to discriminate the radio frequency identification signalling from a particular source based on the particular signal strength of the radio frequency identification signalling received from that source.

Claims

1. An apparatus comprising:

a directional antenna configured to receive high frequency radio frequency identification signalling from multiple sources when the directional antenna is oriented in the direction of a particular source of the multiple sources and operating in both a directional antenna mode and a monopulse antenna mode, the multiple sources each configured to provide their respective high frequency radio frequency identification signalling at a frequency of at least 60 GHz and at different times;

a determination circuit configured to determine respective signal strengths of the high frequency radio frequency identification signalling received from the multiple sources by the directional antenna; and

a discrimination circuit configured to discriminate the high frequency radio frequency identification signalling from the particular source based on a greatest difference in signal strength between the directional and monopulse antenna modes for that particular source as a result of the orientation of the directional antenna.

2. The apparatus of claim 1, wherein the apparatus is configured to receive high frequency radio frequency signalling from radio frequency identification tags.

3. The apparatus of claim 1, wherein the apparatus is configured to allocate transmission times to each of the multiple sources such that they provide their respective high frequency radio frequency identification signalling at different times.

4. The apparatus of claim 3, wherein the apparatus is configured to allocate transmission times in accordance with a synchronous time-division multiplexing protocol.

5. The apparatus of claim 3, wherein the apparatus is configured to include a buffer period in the allocated transmission times.

6. The apparatus of claim 1, wherein the apparatus is one or more of a processor, a portable electronic device and an RFID tag reader.

7. A system comprising the apparatus of claim 1, and one or more high frequency radio frequency identification signalling sources.

8. The system of claim 7, wherein the one or more high frequency radio frequency identification signalling sources are RFID tags.

9. An apparatus comprising:

means for directionally receiving high frequency radio frequency identification signalling from multiple sources when the means for directionally receiving are oriented in the direction of a particular source of the multiple sources and operating in both a directional antenna mode and a monopulse antenna mode, the multiple sources each configured to provide their respective high frequency radio frequency identification signalling at a frequency of at least 60 GHz and at different times;

means for determining respective signal strengths of the high frequency radio frequency identification signalling received from the multiple sources by the means for directionally receiving; and

means for discriminating the high frequency radio frequency identification signalling from the particular source based on a greatest difference in signal strength between the directional and monopulse antenna modes for that particular source as a result of the orientation of the means for directionally receiving.

10. A method comprising:

receiving high frequency radio frequency identification signalling from multiple sources using a directional antenna oriented in the direction of a particular source of the multiple sources and operating in both a directional antenna mode and a monopulse antenna mode, the multiple sources each configured to provide their respective high frequency radio frequency identification signalling at a frequency of at least 60 GHz and at different times;

determining respective signal strengths of the high frequency radio frequency identification signalling received from the multiple sources by the directional antenna; and

discriminating the high frequency radio frequency identification signalling from the particular source based on a greatest difference in signal strength between the directional and monopulse antenna modes for that particular source as a result of the orientation of the directional antenna.

11. A non-transitory computer readable medium having computer program code stored thereon, wherein the code is configured to, upon being executed:

determine respective signal strengths of high frequency radio frequency identification signalling received from multiple sources by a directional antenna oriented in the direction of a particular source of the multiple sources and operating in both a directional antenna mode and a monopulse antenna mode, the multiple sources each configured to provide their respective high frequency radio frequency identification signalling at a frequency of at least 60 GHz and at different times; and

discriminate the high frequency radio frequency identification signalling from the particular source based on a greatest difference in signal strength between the directional and monopulse antenna modes for that particular source as a result of the orientation of the directional antenna.