Systems and methods to transmit configuration change messages between an access point and a station

• US 9,699,667 B2
• Filed: 01/07/2013
• Issued: 07/04/2017
• Est. Priority Date: 01/09/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sampath, Hemanth, Wentink, Maarten Menzo, Merlin, Simone
• Primary Examiner(s): Orgad, Edan
• Assistant Examiner(s): MAGLO, EMMANUEL K
• Application Number:
  US13/735,956
• Publication Number:
  US 20130176925A1
• Time in Patent Office: 1,639 Days
• Field of Search: 370311, 370338, 370328, 370254, 370329, 455423
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A particular method includes transmitting a frame from a station to an access point. The frame includes a beacon sequence number related to a configuration of the access point. The method also includes, in response to transmitting the frame, receiving an update frame from the access point. The update frame indicates at least one change in the configuration of the access point.

Claims

1. A method comprising:

receiving a first beacon frame at a station prior to entering into a low power mode, wherein the first beacon frame is configured to indicate first configuration parameters associated with an access point;

in response to transitioning out of the low power mode, transmitting, from the station to the access point, a frame requesting updated configuration parameters included in a beacon frame missed by the station while the station was operating in the low power, wherein the frame includes information associated with the first configuration parameters received from the access point prior to the station entering into the low power mode;

in response to transmitting the frame, receiving an update frame from the access point when the first configuration parameters are different than current configuration parameters associated with the access point, the update frame configured to indicate a change in at least one of the configuration parameters associated with the access point; and

updating configuration parameters at the station based on the change in the at least one of the configuration parameters.

2. The method of claim 1, further comprising:

in response to transmitting the frame, receiving an acknowledgement frame including an update bit field, wherein the update bit field indicates that the update frame is available at the access point.

3. The method of claim 1, wherein the low power mode includes one of a sleep mode and a power off mode, and wherein the information associated with the first configuration parameters includes a beacon sequence number associated with the first beacon frame, and wherein the first configuration parameters are different than the current configuration parameters when the beacon sequence number is different than a current beacon sequence number associated with a current beacon frame.

4. The method of claim 1, wherein the change in the at least one of the configuration parameters occurs while the station was operating in the low power mode, and wherein the change in the at least one of the configuration parameters includes a channel change, an operating mode change, or a combination thereof, and wherein the channel change includes a channel switch or an extended channel switch.

5. The method of claim 1, wherein the frame comprises a power save polling frame.

6. The method of claim 4, wherein the operating mode change includes at least one of modification of enhanced distribution channel access (EDCA) parameters, modification of a quiet information element, modification of a direct sequence spread spectrum (DSSS) parameter set, modification of a contention-free (CF) parameter set, modification of a frequency-hopping (FH) parameter set, and modification of a high-throughput (HT) operation element.

7. A method comprising:

transmitting a first beacon frame to a station prior to the station entering into a low power mode, wherein the first beacon frame is configured to indicate first configuration parameters associated with an access point;

in response to transitioning out of the low power mode, receiving, at the access point, a frame requesting updated configuration changes included in a beacon frame missed by the station while the station operated in the low power mode, the frame including information associated with the first configuration parameters; and

in response to determining that the first configuration parameters are different than current configuration parameters associated with the access point, transmitting to the station an update frame configured to indicate a change in at least one of the configuration parameters associated with the access point.

8. The method of claim 7, further comprising:

in response to determining that the first configuration parameters are different than the current configuration parameters associated with the access point, scheduling transmission of the update frame to the station during a scheduled transmission time; and

transmitting the update frame to the station during the scheduled transmission time, wherein the scheduled transmission time is a time when the station is not in a sleep mode and is not in a power off mode.

9. The method of claim 7, further comprising:

in response to determining that the first configuration parameters are different than the current configuration parameters associated with the access point, transmitting an acknowledgement frame including an update bit field, wherein the update bit field indicates that the update frame is available at the access point.

10. The method of claim 7, wherein determining that the first configuration parameters are different than the current configuration parameters includes comparing a beacon sequence number associated with the first configuration parameters to a current beacon sequence number associated with the current configuration parameters.

11. The method of claim 7, wherein the update frame is an expanded channel switch announcement frame indicating a channel change of the access point or a very high-throughput (VHT) notification frame indicating an operating mode change of the access point.

12. The method of claim 7, wherein the frame is received from the station in response to the station transitioning out of an asynchronous low power mode.

13. The method of claim 7, wherein the current configuration parameters are stored at the access point prior to receipt of the frame from the station.

14. A method comprising:

in response to transitioning out of an low power mode, transmitting, from a station to an access point, a frame requesting updated configuration changes included in a beacon frame missed by the station while the station operated in the low power mode, wherein the frame includes information associated with first configuration parameters received at the station from the access point prior to the station entering into the low power mode;

in response to transmitting the frame, receiving an update frame from the access point when the first configuration parameters are different than current configuration parameters associated with the access point, wherein the update frame is configured to indicate a change in at least one of the configuration parameters associated with the access point; and

updating configuration parameters at the station based on the change in the at least one of the configuration parameters.

15. The method of claim 14, wherein the configuration parameters are different than the current configuration parameters when a first beacon sequence number associated with the first configuration parameters is different than a current beacon sequence number associated with the current configuration parameters.

16. The method of claim 14, wherein the frame comprises a power save polling (PS-Poll) frame or a trigger frame that causes the access point to send data to the station.

17. The method of claim 14, wherein the frame includes uplink data sent from the station to the access point.

18. The method of claim 14, wherein the change in the at least one of the configuration parameters occurs while the station was operating in the low power mode and wherein the low power mode includes one of a sleep mode and a power off mode.

19. The method of claim 14, wherein the change in the at least one of the configuration parameters includes a channel change, an operating mode change, or a combination thereof, wherein the channel change includes a channel switch or an extended channel switch, and wherein the operating mode change includes at least one of modification of enhanced distribution channel access (EDCA) parameters, modification of a quiet information element, modification of a direct sequence spread spectrum (DSSS) parameter set, modification of a contention-free (CF) parameter set, modification of a frequency-hopping (FH) parameter set, and modification of a high-throughput (HT) operation element.

20. A method comprising:

receiving, at an access point from a station, a frame requesting updated configuration changes included in a beacon frame missed by the station while the station operated in a low power mode, wherein the frame includes information associated with first configuration parameters sent to the station from the access point prior to the station entering into a low power mode; and

in response to determining that the first configuration parameters are different than current configuration parameters associated with the access point, transmitting an update frame to the station, wherein the update frame is configured to indicate a change in at least one of the configuration parameters associated with the access point.

21. The method of claim 20, wherein the update frame includes a current beacon sequence number associated with current configuration of the access point, and further comprising incrementing, at the access point, the current beacon sequence number in response to an additional configuration change of the access point.

22. The method of claim 20, further comprising clearing a flag corresponding to information associated with the station after transmitting the update frame to the station.

23. The method of claim 20, further comprising refraining from transmitting the update frame to the station until the station exits a sleep mode or a power-save mode.

24. The method of claim 21, further comprising:

in response to determining that a beacon sequence number is not the same as the current beacon sequence number, transmitting an acknowledgement frame that includes the current beacon sequence number to the station, wherein the beacon sequence number is associated with the first configuration parameters sent to the station prior to the station entering into a low power mode.

25. A method comprising:

in response to transitioning out of a low power mode, transmitting, to an access point, a frame requesting updated configuration changes included in a beacon frame missed by a station while the station operated in the low power mode;

in response to transmitting the frame, receiving an acknowledgement frame configured to indicate information associated with current configuration parameters of the access point; and

in response to determining that a change in the configuration parameters of the access point occurred while the station operated in the low power mode, transmitting an update request frame to the access point;

receiving an update frame from the access point in response to transmitting the update request, the update frame configured to indicate a change in at least one of the configuration parameters of the access point; and

updating configuration parameters at the station based on the change in the at least one of the configuration parameters.

26. The method of claim 25, wherein the frame comprises a power save polling (PS-Poll) frame having a shorter length than a probe request frame.

27. A method comprising:

receiving, at an access point from a station, a frame requesting updated configuration parameters included in a beacon frame missed by the station while the station was operating in a low power mode;

in response to determining that the station operates in a low power mode, transmitting an acknowledgement frame that includes a configuration change indictor, the configuration change indicator configured to indicate that current configuration parameters associated with the access point are different than first configuration parameters sent to the station from the access point prior to the station entering into the low power mode; and

in response to transmitting the acknowledgement frame, receiving an update request frame from the station; and

in response to receiving the update request frame, transmitting an update frame to the station indicating a change in at least one of the configuration parameters of the access point.

28. The method of claim 27, wherein the configuration change indicator further indicates that a beacon sequence number associated with a current confirmation parameters is not the same as a beacon sequence number sent to the station from the access point prior to the station entering into the low power mode.

29. An apparatus comprising:

a processor; and

a memory storing instructions executable by the processor to;

in response to transitioning out of a low power mode, initiate transmission, to an access point, of a frame requesting updated configuration parameters included in a beacon frame missed by a station while the station was operating in the low power, the frame including information associated with first configuration parameters received at the station from the access point prior to the station entering the low power mode; and

in response to transmission of the frame, detect receipt of an update frame from the access point when the first configuration parameters are different than current configuration parameters associated with the access point, the update frame indicating a change in at least one of the configuration parameters associated with the access point; and

updating configuration parameters at the station based on the change in the at least one of the configuration parameters.

30. The apparatus of claim 29, wherein the instructions are further executable by the processor to:

in response to transmission of the frame, detect receipt of an acknowledgement frame including an update bit field, wherein the update bit field indicates that the update frame is available at the access point;

initiate transmission of an update request frame to the access point; and

in response to transmission of the update request frame, detect receipt of the update frame from the access point.

31. The apparatus of claim 29, wherein the processor is integrated into at least one of a mobile device, a camera, a multimedia player, an entertainment unit, a navigation device, a personal digital assistant (PDA), and a portable computer.

32. An apparatus comprising:

a processor; and

a memory storing instructions executable by the processor to;

detect, at an access point, receipt of a frame requesting updated configuration parameters included in a beacon frame missed by a station while the station was operating in a low power;

in response to determining that the station operates in an low power mode, initiate transmission of an acknowledgement frame that includes information associated with current configuration parameters of the access point;

in response to transmission of the acknowledgement frame, detect receipt of an update request frame from the station when the current configuration parameters are different than first configuration parameters sent to the station from the access point prior to entering into the low power mode; and

in response to receiving the update request frame, transmitting an update frame to the station indicating a change in at least one of the current configuration parameters associated with the access point.

33. The apparatus of claim 32, wherein the first configuration parameters are different than the current configuration parameters when a beacon sequence number associated with the first configuration parameters is not the same as a current beacon sequence number associated with the current configuration parameters.

34. An apparatus comprising:

means for receiving, at an access point, a frame requesting updated configuration parameters included in a beacon frame missed by a station while the station was operating in a low power mode, the frame including information associated with first configuration parameters sent to the station from the access point prior to the station entering a low power mode;

means for determining that the station has operated in the low power mode; and

means for transmitting, in response to determining that the first configuration parameters are different than current configuration parameters associated with the access point, an update frame that indicates at least one difference between the current configuration parameters and the first configuration parameters.

35. An apparatus comprising:

means for transmitting, in response to transitioning out of a low power mode, a frame from a station to an access point, the frame requesting updated configuration parameters included in a beacon frame missed by the station while the station was operating in the low power;

means for receiving an acknowledgement frame that includes a configuration change indictor, the configuration change indicator configured to indicate that current configuration parameters associated with the access point are different than first configuration parameters received at the station from the access point prior to the station entering into the low power mode; and

wherein the means for transmitting is further configured to transmit an update request frame to the access point based on the configuration change indicator.

36. A non-transitory computer-readable medium including program code that, when executed by a processor, causes the processor to:

in response to transitioning out of a low power mode, initiate transmission, from a station to an access point, a frame requesting updated configuration parameters included in a beacon frame missed by the station while the station was operating in the low power, the frame including information associated with first configuration parameters received at the station from of the access point prior to the station entering into the low power mode;

in response to transmission of the frame, detect receipt of an update frame from the access point when the first configuration parameters are different than current configuration parameters associated with the access point, the update frame configured to indicate a change in at least one of the configuration parameters of the access point; and

updating configuration parameters at the station based on the change in the at least one of the configuration parameters.

37. The non-transitory computer-readable medium of claim 36, further comprising program code that, when executed by the processor, causes the processor to:

in response to transmission of the frame, detect receipt of an acknowledgement frame including an update bit field, wherein the update bit field indicates that the update frame is available at the access point;

initiate transmission of an update request frame to the access point; and

in response to transmission of the update request frame, detect receipt of the update frame from the access point.

38. A non-transitory computer-readable medium comprising program code that, when executed by a processor, causes the processor to:

detect, at an access point, receipt of a frame requesting updated configuration parameters included in a beacon frame missed by a station while the station was operating in a low power mode;

in response to determining that the station operates in a low power mode, initiate transmission of an acknowledgement frame that includes information associated with current configuration parameters associated with the access point;

in response to transmission of the acknowledgement frame, detect receipt of an update request frame from the station when the current configuration parameters are different than first configuration parameters sent to the station from the access point prior to the station entering into the low power mode; and

in response to receiving the update request frame, transmitting an update frame to the station indicating at least one change in the configuration parameters associated with the access point.

39. The non-transitory computer-readable medium of claim 38, wherein the current configuration parameters are stored at the access point prior to the receipt of the update request frame from the station.