Wake-up radio roaming

Patent metadata

Field	Value
Publication number	US-10924995-B2
Application number	US-201816135767-A
Country	US
Kind code	B2
Filing date	Sep 19, 2018
Priority date	Sep 19, 2018
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

This disclosure is directed to controlling a wake-up radio (WUR) in a wireless station side client device (STA-device). In one example, after the STA-device has received negotiation parameters from a wireless access point (AP) to establish a wireless association as a network connection between the STA-device and the AP. The PCR may be disabled in favor of the WUR. The WUR, which may use less power than the PCR, may then monitor for Beacon Frames (e.g., in the disclosed beacon loop) and Discovery Frames (e.g., in the disclosed discovery loop). Based on a state machine, that may be implemented as computer instructions executed by a hardware processor of the STA-device. Generally, the STA-device may use the WUR and state machine implementation to determine a proper time to re-enable the PCR for communication with the AP.

First claim

What is claimed is:

1. A computer-implemented method of controlling a wake-up radio (WUR) in a wireless station side client device, the method comprising:
switching wireless network communication for a wireless station side client device from a primary communication radio (PCR) to a WUR;
initiating a beacon loop to detect if a beacon frame has not been received at the WUR within a first duration of the beacon loop;
exiting the beacon loop responsive to exceeding the first duration to enter a discovery loop;
processing the discovery loop to detect if a discovery frame has not been received at the WUR within a second duration of the discovery loop;
exiting the discovery loop responsive to exceeding the second duration or receiving a discovery frame; and
switching wireless network communication for the wireless station side client device from the WUR to the PCR.

2. The computer-implemented method of claim 1 , wherein the first duration is determined by a beacon timer (BT) and repeating monitoring for beacon frames until a count of missed consecutive beacon frames exceeds a beacon missed threshold.

3. The computer-implemented method of claim 1 , wherein the second duration is determined by a discovery timer (DT) and repeating monitoring for discovery frames until a count of missed consecutive discovery frames exceeds a discovery missed threshold.

4. The computer-implemented method of claim 1 , wherein the first duration is determined by a time period calculated based on a configurable number of missed beacon frames multiplied by an expected interval between beacon frames.

5. The computer-implemented method of claim 4 , wherein parameters to determine the first duration are included as part of a negotiation phase that includes exchange of negotiation parameters from a wireless access point (AP), the negotiation parameters including parameters sufficient to establish a wireless association as a network connection for wireless network communication between the wireless station side client device and the AP.

6. The computer-implemented method of claim 1 , further comprising:
changing the channel monitored by the WUR as part of exiting the beacon loop and entering the discovery loop.

7. The computer-implemented method of claim 1 , further comprising:
exiting the discovery loop responsive to receiving a discovery frame; and
changing the channel monitored by the WUR to a beacon monitoring channel prior to re-entering the beacon loop.

8. The computer-implemented method of claim 1 , further comprising:
reassociating a network connection for wireless network communication between the wireless station side client device and the AP after switching wireless network communication for the wireless station side client device from the WUR to the PCR.

9. A computer device, comprising:
a hardware processor;
a wireless network interface communicatively coupled to the hardware processor;
a wake-up radio (WUR) communicatively coupled to the hardware processor;
a primary communication radio (PCR) communicatively coupled to the hardware processor and the wireless network interface; and
an instruction memory area communicatively coupled to the hardware processor, wherein the instruction memory area stores instructions, that when executed by the hardware processor, cause the hardware processor to:
switch wireless network communication for the computer device from the PCR to the WUR;
initiate a beacon loop to detect if a beacon frame has not been received at the WUR within a first duration of the beacon loop;
exit the beacon loop responsive to exceeding the first duration to enter a discovery loop;
process the discovery loop to detect if a discovery frame has not been received at the WUR within a second duration of the discovery loop;
exit the discovery loop responsive to exceeding the second duration or receiving a discovery frame; and
switch wireless network communication for the computer device from the WUR to the PCR.

10. The computer device of claim 9 , wherein the first duration is determined by a beacon timer (BT) and repeating monitoring for beacon frames until a count of missed consecutive beacon frames exceeds a beacon missed threshold.

11. The computer device of claim 9 , wherein the second duration is determined by a discovery timer (DT) and repeating monitoring for discovery frames until a count of missed consecutive discovery frames exceeds a discovery missed threshold.

12. The computer device of claim 9 , wherein the first duration is determined by a time period calculated based on a configurable number of missed beacon frames multiplied by an expected interval between beacon frames.

13. The computer device of claim 12 , wherein parameters to determine the first duration are included as part of a negotiation phase that includes exchange of negotiation parameters from a wireless access point (AP), the negotiation parameters including parameters sufficient to establish a wireless association as a network connection for wireless network communication between the wireless station side client device and the AP.

14. The computer device of claim 9 , wherein the instruction memory area further comprises instructions, that when executed by the hardware processor, cause the hardware processor to:
change the channel monitored by the WUR as part of exiting the beacon loop and entering the discovery loop.

15. The computer device of claim 9 , wherein the instruction memory area further comprises instructions, that when executed by the hardware processor, cause the hardware processor to:
exit the discovery loop responsive to receiving a discovery frame; and
change the channel monitored by the WUR to a beacon monitoring channel prior to re-entering the beacon loop.

16. The computer device of claim 9 , wherein the instruction memory area further comprises instructions, that when executed by the hardware processor, cause the hardware processor to:
reassociate a network connection for wireless network communication between the computer device and the AP after switching wireless network communication for the computer device from the WUR to the PCR.

17. A non-transitory computer readable medium comprising computer executable instructions stored thereon that when executed by one or more hardware processors, cause the one or more hardware processors to:
switch wireless network communication for a device from a primary communication radio (PCR) to a wake-up radio (WUR);
initiate a beacon loop to detect if a beacon frame has not been received at the WUR within a first duration of the beacon loop;
exit the beacon loop responsive to exceeding the first duration to enter a discovery loop;
process the discovery loop to detect if a discovery frame has not been received at the WUR within a second duration of the discovery loop;
exit the discovery loop responsive to exceeding the second duration or receiving a discovery frame; and
switch wireless network communication for the device from the WUR to the PCR.

18. The non-transitory computer readable medium of claim 17 , wherein the computer executable instructions further comprise instructions to cause the one or more hardware processors to:
reassociate the network connection for wireless network communication between the computer device and the AP after switching wireless network communication for the computer device from the WUR to the PCR.

19. The non-transitory computer readable medium of claim 17 , wherein the first duration is determined by a time period calculated based on a configura

Assignees

• Hewlett Packard Entpr Dev Lp

Inventors

• Patwardhan Gaurav
• Perahia Eldad

Classifications

• H04W52/0229

  where the received signal is a wanted signal · CPC title

• H04W52/0225

  using monitoring of external events, e.g. the presence of a signal · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04W36/0011 Primary

  for data sessions of end-to-end connection · CPC title

• H04W76/11

  Allocation or use of connection identifiers · CPC title