Bluetooth based motion detection systems

Patent metadata

Field	Value
Publication number	US-10462633-B2
Application number	US-201715621914-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Mar 10, 2017
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

This disclosure provides systems, methods and apparatuses for detecting motion based on wireless signals. In some implementations, a receiving device may receive, from a transmitting device, a packet containing a sequence. In some aspects, the packet may be a Bluetooth packet, and the sequence may be contained in a supplemental information appended to the Bluetooth packet. The receiving device may estimate angle information of the packet based on the sequence, and determine a difference between the estimated angle information and a reference angle. The angle information may be an angle of arrival (AoA) or an angle of departure (AoD) of the packet. The receiving device may detect motion based on the determined difference.

First claim

What is claimed is:

1. An apparatus, comprising:
one or more transceivers configured to receive wireless signals from a transmitting device via a plurality of receive antennas;
one or more processors; and
a memory comprising instructions that, when executed by the one or more processors, cause the apparatus to:
receive, from the transmitting device, a reference packet containing a reference sequence;
determine phase differences between signal components of the reference sequence arriving via the plurality of receive antennas;
determine a reference angle based at least in part on the determined phase differences;
receive, from the transmitting device, a wireless signal via the plurality of receive antennas, the wireless signal including a packet containing a sequence known by the apparatus;
determine phase differences between signal components of the sequence arriving via the plurality of receive antennas;
determine at least one of an angle of arrival (AoA) or an angle of departure (AoD) of the packet based at least in part on the determined phase differences;
determine a difference between at least one of the AoA or the AoD and the reference angle; and
detect a presence or absence of motion of an object other than the apparatus or the transmitting device in the vicinity of the apparatus and the transmitting device based on the determined difference.

2. The apparatus of claim 1 , wherein execution of the instructions to detect motion causes the apparatus to:
detect the presence of motion based on the difference being greater than or equal to a value; and
detect the absence of motion based on the difference being less than the value.

3. The apparatus of claim 1 , wherein the packet comprises a Bluetooth packet, and the sequence is contained in a supplemental information appended to the Bluetooth packet.

4. The apparatus of claim 1 , wherein the sequence comprises a plurality of tones and wherein execution of the instructions further causes the apparatus to:
switch signal reception operations between the plurality of receive antennas based on an antenna switching schedule.

5. The apparatus of claim 1 , wherein the sequence is received from a plurality of transmit antennas of the transmitting device, wherein the sequence comprises a plurality of tones, and wherein execution of the instructions causes the apparatus to:
receive an antenna switching schedule from the transmitting device; and
determine from which of the plurality of transmit antennas each of the tones is transmitted based at least in part on the antenna switching schedule.

6. The apparatus of claim 1 , wherein execution of the instructions further causes the apparatus to:
determine a direction of motion of the object based at least in part on the determined difference.

7. The apparatus of claim 6 , wherein execution of the instructions further causes the apparatus to:
perform one or more operations based on at least one of the detected motion and the determined direction of motion.

8. A method of motion detection using wireless signals, the method performed by a receiving device and comprising:
receive, from a transmitting device, a reference packet containing a reference sequence;
determine phase differences between signal components of the reference sequence arriving via a plurality of receive antennas;
determine a reference angle based at least in part on the determined phase differences;
receiving, from the transmitting device via the plurality of receive antennas, a packet containing a sequence known by the receiving device;
determining phase differences between signal components of the sequence arriving via the plurality of receive antennas;
determining at least one of an angle of arrival (AoA) or an angle of departure (AoD) of the packet based at least in part on the determined phase differences;
determining a difference between at least one of the AoA or the AoD and the reference angle; and
detecting a presence or absence of motion of an object other than the receiving device or the transmitting device in the vicinity of the receiving device and the transmitting device based on the determined difference.

9. The method of claim 8 , wherein the detecting comprises:
detecting the presence of motion based on the difference being greater than or equal to a value; and
detecting the absence of motion based on the difference being less than the value.

10. The method of claim 8 , wherein the packet comprises a Bluetooth packet, and the sequence is contained in a supplemental information appended to the Bluetooth packet.

11. The method of claim 8 , wherein the sequence comprises a plurality of tones, and the method further comprises:
switching signal reception operations between the plurality of receive antennas based on an antenna switching schedule.

12. The method of claim 8 , wherein the sequence is received from a plurality of transmit antennas of the transmitting device, wherein the sequence comprises a plurality of tones, and wherein the method further comprises:
receiving an antenna switching schedule from the transmitting device; and
determining from which of the plurality of transmit antennas each of the tones is transmitted based at least in part on the antenna switching schedule.

13. The method of claim 8 , further comprising:
determining a direction of motion of the object based at least in part on the determined difference.

14. The method of claim 13 , further comprising:
performing one or more operations based on at least one of the detected motion and the determined direction of motion.

15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a receiving device, cause the receiving device to perform operations comprising:
receiving, from a transmitting device, a reference packet containing a reference sequence;
determine phase differences between signal components of the reference sequence arriving via a plurality of receive antennas;
determine a reference angle based at least in part on the determined phase differences;
receiving, from the transmitting device via the plurality of receive antennas, a packet containing a sequence known by the receiving device;
determining phase differences between signal components of the sequence arriving via the plurality of receive antennas;
determining at least one of an angle of arrival (AoA) or an angle of departure (AoD) of the packet based at least in part on the determined phase differences;
determining a difference between at least one of the AoA or the AoD and the reference angle; and
detecting a presence or absence of motion of an object other than the receiving device or the transmitting device in the vicinity of the receiving device and the transmitting device based on the determined difference.

16. The non-transitory computer-readable medium of claim 15 , wherein execution of the instructions for detecting motion causes the receiving device to perform operations further comprising:
detecting the presence of motion based on the difference being greater than or equal to a value; and
detecting the absence of motion based on the difference being less than the value.

17. The non-transitory computer-readable medium of claim 15 , wherein the packet comprises a Bluetooth packet, and the sequence is contained in a supplemental information appended to the Bluetooth packet.

18. The non-transitory computer-readable medium of claim 15 , wherein execution of the instructions causes the receiving device to perform operatio

Assignees

• Qualcomm Inc

Inventors

• Haverinen Anssi
• Zhang Xiaoxin
• Zhang Ning
• Kesireddy Sandeep

Classifications

• H04W84/18

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• H04B17/12

  of transmit antennas, e.g. of the amplitude or phase · CPC title

• H04B7/0822

  according to predefined selection scheme · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W4/80 Primary

  Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication · CPC title