Methods for efficient power saving for wake up radios

Patent metadata

Field	Value
Publication number	US-11076353-B2
Application number	US-201716347192-A
Country	US
Kind code	B2
Filing date	Nov 3, 2017
Priority date	Nov 3, 2016
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Exemplary embodiments disclosed herein provide procedures for power efficient and rapid access point (AP) discovery using wake up radios. Additional embodiments provide procedures for securely waking up stations (STAs) using wake up radios (WURs). Methods are further described herein for coverage range detection and STA roaming for wake up radios. Further embodiments relate to procedures for coexistence for wake up radios and primary connectivity radios.

First claim

What is claimed:

1. A method performed by a station (STA) capable of equipped with a wake-up radio (WUR) operations and a primary connectivity radio (PCR), the method comprising:
before the STA enters a sleep state, receiving a first security phrase; while the PCR STA is in a the sleep state, receiving a wake-up frame on the WUR, wherein the wake-up frame includes at least a security field derived from a Timing Synchronization Function (TSF) timer;
determining a second security phrase based on the received first security phrase and the received wake-up frame;
determining whether the wake-up frame is valid based at least in part on there is a match between the second security phrase and a value information in the security field of the wake-up frame; and
waking up the STA PCR only if based on a determination is made that there is a match between the second security phrase and the value in the field of the wake-up frame is valid.

2. The method of claim 1 , further comprising:
before the PCR STA enters the sleep state, transmitting a challenge phrase from the PCR;
wherein the waking up of the PCR STA is performed only if a response phrase in the security field corresponds to the transmitted challenge phrase.

3. The method of claim 1 , wherein the wake-up frame further includes an SSID/BSSID, and wherein the waking up of the PCR STA is performed only if the SSID/BSSID in the wake-up frame is an SSID/BSSID of the STA.

4. The method of claim 1 , wherein the STA is an access point, wherein the wake-up frame includes an uplink/downlink indicator, and wherein the waking up of the PCR STA is performed only if the uplink/downlink indicator indicates an uplink transmission.

5. The method of claim 1 , wherein the STA is a non-access-point STA, wherein the wake-up frame includes an uplink/downlink indicator, and wherein the waking up of the PCR STA is performed only if the uplink/downlink indicator indicates a downlink transmission.

6. The method of claim 1 , wherein the STA is an access point associated with a responding schedule, and wherein the waking up of the PCR STA is performed only if the wake-up frame is received during a scheduled responding time for the access point in the responding schedule.

7. The method of claim 1 , wherein the STA is an access point associated with a responding schedule, and wherein the waking up of the PCR STA is performed only if (i) the wake-up frame is received during a scheduled responding time for the access point or (ii) an SSID/BSSID received in the wake-up frame is an SSID/BSSID of the access point.

8. The method of claim 1 , wherein the STA is an access point and the wake-up frame includes a received access point configuration sequence number (CSN), the method further comprising:
in response to the received wake-up frame, sending from the PCR STA an indication of whether the received CSN is a current CSN.

9. The method of claim 1 , further comprising, in response to the received wake-up frame, sending a probe response frame from the PCRSTA.

10. The method of claim 1 , further comprising, in response to the received wake-up frame, transmitting a beacon from the PCRSTA.

11. The method of claim 1 , wherein the value in security field is derived from the a Timing Synchronization Function (TSF) timer.

12. The method of claim 1 , wherein the security field is contained in or associated with a Frame Check Sequence (FCS) field of the wake-up frame.

13. The method of claim 1 , wherein before the STA enters the sleep state or after the STA wakes up, the STA is capable of primary connectivity radio (PCR) operations.

14. A station (STA) capable of equipped with a wake-up radio (WUR) operations and a primary connectivity radio (PCR), the STA being configured to perform functions comprising:
before the STA enters a sleep state, receiving a first security phrase;
while the PCR STA is in a the sleep state, receiving a wake-up frame on the WUR, wherein the wake-up frame includes at least a security field derived from a Timing Synchronization Function (TSF) timer;
determining a second security phrase based on the received first security phrase and the received wake-up frame;
determining whether the wake-up frame is valid based at least in part on there is a match between the second security phrase and a value information in the security field of the wake-up frame; and
waking up the STA PCR only if based on a determination is made that there is a match between the second security phrase and the value in the field of the wake-up frame is valid.

15. The STA of claim 14 , wherein the STA is further configured to perform functions comprising:
before the PCR STA enters the sleep state, transmitting a challenge phrase from the PCR;
wherein the waking up of the PCR STA is performed only if a response phrase in the security field corresponds to the transmitted challenge phrase.

16. The STA of claim 14 , wherein the wake-up frame further includes an SSID/BSSID, and wherein the waking up of the PCR STA is performed only if the SSID/BSSID in the wake-up frame is an SSID/BSSID of an access point.

17. The STA of claim 14 , wherein the value in security field is derived from the a Timing Synchronization Function (TSF) timer.

18. The STA of claim 14 , wherein the security field is contained in or associated with a Frame Check Sequence (FCS) field of the wake-up frame.

19. The STA of claim 14 , wherein before the STA enters the sleep state or after the STA wakes up, the STA is capable of primary connectivity radio (PCR) operations.

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Wang Xiaofei
• Sun Li-Hsiang
• Oteri Oghenekome

Classifications

• H04W52/0235 Primary

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

• Y02D30/70

  in wireless communication networks · CPC title

• H04W52/0229 Primary

  where the received signal is a wanted signal · CPC title

• H04W52/0248 Primary

  dependent on the time of the day, e.g. according to expected transmission activity · CPC title

• H04W52/0251

  using monitoring of local events, e.g. events related to user activity · CPC title