Mechanism for proximity detection based on Wi-Fi signals

• US 8,824,316 B2
• Filed: 10/13/2010
• Issued: 09/02/2014
• Est. Priority Date: 10/13/2010
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Lipman, Justin, Pering, Trevor, Zhao, Chengxue, Lyons, Kenton Michael
• Primary Examiner(s): CHAN, SAI MING
• Application Number:
  US12/999,629
• Publication Number:
  US 20130229928A1
• Time in Patent Office: 1,420 Days
• Field of Search: 370/252, 370/332
• US Class Current: 370/252
• CPC Class Codes: G01S 11/06 using intensity measurements
• CPC Class Codes: G01S 11/14 using ultrasonic, sonic, or infrasonic waves
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor

Abstract

A mechanism is described for proximity detection based on Wi-Fi signals. A method of embodiments of the invention includes determining strength of one or more signals being communicated between one or more antennae of a first device and two or more antennae of a second device. The one or more signals are associated with a broadcast packet. The method further includes determining proximity of the first device and the second device based on the determined strength of the one or more signals.

Claims

1. A method comprising:

determining, via a processing device, strength of one or more signals being communicated between one or more antennae of a first device and two or more antennae of a second device, wherein determining the strength includes calculating an amount of signal drop associated with each of the one or more signals communicated over one or more paths between the one or more antennae and the two or more antennae; and

determining, via the processing device, proximity between the first device and the second device based on the determined strength of the one or more signals.

2. The method of claim 1, wherein the determined strength is based on Received Signal Strength Indicator (RSSI) between an antenna of the first device and an antenna of the second device, wherein determining the proximity includes determining physical placement of the first device with respect to the second device.

3. The method of claim 1, further comprising:

detecting an embedded time within a signal being communicated between an access point and the first device; and

communicating an audio signal between the first device and the second device, and determining a reception time of the audio signal.

4. The method of claim 1, further comprising determining the proximity of the first and second devices based on the reception time and the speed of sound.

5. The method of claim 1, further comprising determining Wi-Fi interference caused by a Liquid Crystal Display (LCD) backlight, wherein the proximity is further determined based on the determined interference.

12. The method of claim 1, wherein the signal drop is performed gradually over the one or more paths and is directly proportional to the proximity of the first device with the second device, wherein a higher signal drop corresponds to a higher distance between the first and second devices and wherein a lower signal drop corresponds to a lower distance between the first and second devices.

13. The method of claim 1, wherein the one or more antennae and the two or more antennae are strategically placed at the first device and the second device, respectively.

6. An apparatus comprising:

a first logic to determine strength of one or more signals being communicated between one or more antennae of a first device and two or more antennae of a second device, wherein determining the strength includes calculating an amount of signal drop associated with each of the one or more signals communicated over one or more paths between the one or more antennae and the two or more antennae; and

a second logic to determine proximity between the first device and the second device based on the determined strength of the one or more signals.

7. The apparatus of claim 6, wherein the determined strength is based on Received Signal Strength Indicator (RSSI) between an antenna of the first device and an antenna of the second device, wherein determining the proximity includes determining physical placement of the first device with respect to the second device.

8. The apparatus of claim 6, further comprising:

a third logic to detect an embedded time within a signal being communicated between an access point and the first device; and

a forth logic to communicate an audio signal between the first device and the second device, and determining a reception time of the audio signal.

9. The apparatus of claim 6, further comprising a fifth logic to determine the proximity of the first and second devices based on the reception time and the speed of sound.

10. The apparatus of claim 6, further comprising a sixth logic to determine interference caused by a Liquid Crystal Display (LCD) backlight.

11. The apparatus of claim 10, further comprising a seventh logic to determine the proximity of the first and second devices based on the determined interference.

14. The apparatus of claim 6, wherein the signal drop is performed gradually over the one or more paths and is directly proportional to the proximity of the first device with the second device, wherein a higher signal drop corresponds to a higher distance between the first and second devices and wherein a lower signal drop corresponds to a lower distance between the first and second devices.

15. The apparatus of claim 6, wherein the one or more antennae and the two or more antennae are strategically placed at the first device and the second device, respectively.

16. At least one non-transitory machine-readable medium having stored thereon instructions that when executed cause a processing device to perform one or more operations comprising:

determining strength of one or more signals being communicated between one or more antennae of a first device and two or more antennae of a second device, wherein determining the strength includes calculating an amount of signal drop associated with each of the one or more signals communicated over one or more paths between the one or more antennae and the two or more antennae; and

determining proximity between the first device and the second device based on the determined strength of the one or more signals.

17. The machine-readable medium of claim 16, wherein the determined strength is based on Received Signal Strength Indicator (RSSI) between an antenna of the first device and an antenna of the second device, wherein determining the proximity includes determining physical placement of the first device with respect to the second device.

18. The machine-readable medium of claim 16, wherein the one or more operations comprise:

detecting an embedded time within a Wi-Fi signal being communicated between an access point and the first device; and

communicating an audio signal between the first device and the second device, and determining a reception time of the audio signal.

19. The machine-readable medium of claim 16, wherein the signal drop is performed gradually over the one or more paths and is directly proportional to the proximity of the first device with the second device, wherein a higher signal drop corresponds to a higher distance between the first and second devices and wherein a lower signal drop corresponds to a lower distance between the first and second devices.

20. The machine-readable medium of claim 16, wherein the one or more antennae and the two or more antennae are strategically placed at the first device and the second device, respectively.