Low power techniques for bluetooth low energy in scanning state

Patent metadata

Field	Value
Publication number	US-11330468-B2
Application number	US-202016832425-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 27, 2020
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, related to low power techniques for a BLE device during a scanning state. The BLE device is configured to scan for a preamble of a packet while in a first power mode and detect when a bit of the preamble is received. Upon detecting that the bit of the preamble is received, the BLE device switches from the first power mode to a second power having a higher operating power for the BLE device than the first power mode. The switch in power modes occurs while the preamble is being received or immediately after the preamble is received and before an access address of the packet is received. The BLE device, while in the second power mode, then scans for the access address of the packet.

First claim

What is claimed is:

1. A method of wireless communication at a communication device, comprising:
scanning while in a first power mode for a preamble of a packet;
detecting that a bit of the preamble is received;
switching from the first power mode to a second power mode upon detecting that the bit of the preamble is received, the second power mode having a higher operating power for the communication device than the first power mode, the switching occurring while the preamble is being received, or immediately after the preamble is received and before a first bit of an access address of the packet is received; and
scanning, while in the second power mode, for the access address of the packet.

2. The method of claim 1 , wherein the scanning for the access address of the packet comprises detecting whether the access address of the packet is received.

3. The method of claim 2 , further comprising receiving a payload of the packet upon detecting that the access address of the packet is received.

4. The method of claim 2 , further comprising:
starting a timer upon switching from the first power mode to the second power mode; and
detecting whether a second bit of the preamble is received upon detecting that the access address of the packet is not received.

5. The method of claim 4 , further comprising:
resetting the timer upon determining that the second bit of the preamble is received; and
scanning for the access address of the packet after resetting the timer.

6. The method of claim 4 , further comprising determining whether the timer has elapsed upon determining that the second bit of the preamble is not received.

7. The method of claim 6 , further comprising scanning for the access address of the packet after determining that the timer has not elapsed.

8. The method of claim 6 , further comprising:
switching from the second power mode to the first power mode upon determining that the timer has elapsed; and
scanning while in the first power mode for another preamble of a second packet.

9. The method of claim 6 , wherein the timer elapses after a timer threshold, the timer threshold corresponding to a time difference between detecting that the bit of the preamble is received and an end of the access address.

10. The method of claim 2 , further comprising:
starting a timer upon switching from the first power mode to the second power mode; and
determining whether the timer has elapsed upon detecting that the access address of the packet is not received.

11. The method of claim 10 , further comprising:
switching from the second power mode to the first power mode upon determining that the timer has elapsed; and
scanning while in the first power mode for another preamble of a second packet.

12. The method of claim 10 , further comprising detecting whether a second bit of the preamble is received upon determining that the timer has not elapsed.

13. The method of claim 12 , further comprising scanning for receiving the access address of the packet after determining that the second bit of the preamble is not received.

14. The method of claim 12 , further comprising:
resetting the timer upon determining that the second bit of the preamble is received; and
scanning for the access address of the packet after resetting the timer.

15. The method of claim 1 , wherein the communication device is a Bluetooth Low Energy (BLE) device and the packet is a BLE packet.

16. The method of claim 1 , wherein the preamble comprises n bits, and the preamble is detected after receiving nm bits of the preamble.

17. The method of claim 16 , wherein m is less than or equal to 2.

18. The method of claim 16 , wherein n is equal to 8.

19. An apparatus for wireless communication, the apparatus being a communication device, comprising:
means for scanning while in a first power mode for a preamble of a packet;
means for detecting that a bit of the preamble is received;
means for switching from the first power mode to a second power mode upon detecting that the bit of the preamble is received, the second power mode having a higher operating power for the communication device than the first power mode, the switching occurring while the preamble is being received, or immediately after the preamble is received and before an access address of the packet is received; and
means for scanning, while in the second power mode, for the access address of the packet.

20. The apparatus of claim 19 , wherein the means for scanning for the access address of the packet is configured to detect whether the access address of the packet is received.

21. The apparatus of claim 20 , further comprising means for receiving a payload of the packet upon detecting that the access address of the packet is received.

22. The apparatus of claim 20 , further comprising:
means for starting a timer upon switching from the first power mode to the second power mode; and
means for detecting whether a second bit of the preamble is received upon detecting that the access address of the packet is not received.

23. The apparatus of claim 22 , further comprising:
means for resetting the timer upon determining that the second bit of the preamble is received; and
means for scanning for the access address of the packet after resetting the timer.

24. The apparatus of claim 22 , further comprising means for determining whether the timer has elapsed upon determining that the second bit of the preamble is not received.

25. The apparatus of claim 24 , further comprising means for scanning for the access address of the packet after determining that the timer has not elapsed.

26. The apparatus of claim 24 , further comprising:
means for switching from the second power mode to the first power mode upon determining that the timer has elapsed; and
means for scanning while in the first power mode for another preamble of a second packet.

27. The apparatus of claim 24 , wherein the timer elapses after a timer threshold, the timer threshold corresponding to a time difference between detecting that the bit of the preamble is received and an end of the access address.

28. The apparatus of claim 20 , further comprising:
means for starting a timer upon switching from the first power mode to the second power mode; and
means for determining whether the timer has elapsed upon detecting that the access address of the packet is not received.

29. The apparatus of claim 28 , further comprising:
means for switching from the second power mode to the first power mode upon determining that the timer has elapsed; and
means for scanning while in the first power mode for another preamble of a second packet.

30. The apparatus of claim 28 , further comprising means for detecting whether a second bit of the preamble is received upon determining that the timer has not elapsed.

31. The apparatus of claim 30 , further comprising means for scanning for receiving the access address of the packet after determining that the second bit of the preamble is not received.

32. The apparatus of claim 30 , further comprising:
means for resetting the timer upon determining that the second bit of the preamble is received; and
means for scanning for the access address of the packet after resetting the timer.

33. The apparatus of claim 19 ,

Assignees

• Qualcomm Inc

Inventors

• Hosseini Seyed Mohammad Ehsan
• Luong Le Nguyen
• Kang Eunmo
• Kim Dongsik

Classifications

• Y02D30/70

  in wireless communication networks · CPC title

• H04W52/0216

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• H04W52/0235 Primary

  where the received signal is a power saving command · CPC title

• H04W8/005

  Discovery of network devices, e.g. terminals · CPC title

• H04W84/18

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