Multiple density configurations and algorithms for intelligent power savings infrastructure in wireless LANS

Patent metadata

Field	Value
Publication number	US-10251129-B2
Application number	US-201313968512-A
Country	US
Kind code	B2
Filing date	Aug 16, 2013
Priority date	Jul 3, 2008
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Described in example embodiments herein are techniques for implementing power savings in a wireless local area network (WLAN). In accordance with an example embodiment, a centralized controller can be employed to gather data about network activity and select access points to switch to power save mode. Optionally, the controller may designate certain access points to remain active so as to monitor for clients attempting to access the WLAN. An aspect of an example embodiment is that it allows the controller to configure and manage power consumption based on demands on the overall system. In an example embodiment, techniques for implementing power savings within individual hardware components, such as access points, are disclosed. An aspect of a technique described in an example embodiment is that it provides flexibility to balance power savings and performance.

First claim

The invention claimed is:

1. A system, comprising:
a controller; and
a first access point, the first access point comprising:
processing logic; and
at least one wireless transceiver in communication with the processing logic, wherein the wireless transceiver is configured to send data to, and receive data from, client devices;
wherein the processing logic is configured to:
determine a number of the client devices associated to the first access point, and
transmit the number to the controller; and

wherein the controller is configured to:
determine that at least one client device is associated with the first access point;
determine that the at least one client device is capable of associating with a second access point;
force the at least one client device to roam to the second access point; and
transmit a signal to the first access point to switch to a power save mode,
wherein at least one of the processing logic and the at least one wireless transceiver is configured to switch to the power save mode responsive to receiving the signal from the controller, wherein the signal represents a determination that no client device is associated with the first access point.

2. The system of claim 1 , wherein the processing logic switches to the power save mode responsive to the signal.

3. The system of claim 2 , wherein in response to receiving a wireless signal, the at least one wireless transceiver sends a wakeup signal to the processing logic; and
wherein the processing logic is responsive to the wakeup signal to leave the power save mode.

4. The system of claim 1 , wherein the at least one wireless transceiver switches to the power save mode responsive to the signal.

5. The system of claim 4 , wherein the processing logic is responsive to receiving a different signal from the controller to send a wakeup signal to the at least one wireless transceiver; and
wherein the at least one wireless transceiver is responsive to the wakeup signal to leave the power save mode.

6. The system of claim 1 , wherein the at least one wireless transceiver comprises at least two wireless transceivers; and
wherein in response to receiving the signal from the controller one of the two wireless transceivers enters the power save mode while the other of the two wireless transceivers remains operational.

7. The system of claim 1 , wherein the controller is external to the first access point and is configured to determine that no client device is associated with the first access point.

8. The system of claim 1 ,
wherein the processing logic is configured to determine that no client device is associated with the first access point.

9. A method of operation for an access point, comprising:
receiving, from a first access point metadata indicating a number of client devices associated with the first access point;
determining that at least one client device is associated with the first access point;
determining that the at least one client device is capable of associating with a second access point;
forcing the at least one client device to roam to the second access point; and
transmitting a signal to the first access point to switch to a power save mode, wherein the signal represents a determination that no client device is associated with the first access point.

10. The method of claim 9 , wherein processing logic in the first access point is selected to switch to the power save mode and the processing logic is switched to the power save mode responsive to the signal.

11. The method of claim 10 , further comprising, in response to receiving a wireless signal, sending, from at least one wireless transceiver in the first access point, a wakeup signal to the processing logic, and
in response to the wakeup signal, switching the processing logic out of the power save mode.

12. The method of claim 9 , wherein at least one wireless transceiver in the first access point is selected to switch to the power save mode and the at least one wireless transceiver is switched to the power save mode responsive to the signal.

13. The method of claim 12 , further comprising receiving, at processing logic in the first access point a different signal from a controller to send a wakeup signal to the at least one wireless transceiver;
sending, from the processing logic, the wakeup signal to the at least one wireless transceiver, and
in response to the wakeup signal, switching the at least one wireless transceiver out of the power save mode.

14. The method of claim 9 , wherein the first access point comprises at least two wireless transceivers, the method further comprising switching one of the two wireless transceivers into the power save mode and maintaining the other of the two wireless transceivers as operational in response to receiving the signal from a controller.

15. The method of claim 9 , further comprising determining, by processing logic in the first access point, that no client device is communicating with at least one wireless transceiver in the first access point.

16. A non-transitory computer readable medium comprising computer code that when executed by a processor is operable to:
receive, from a first access point, metadata indicating a number of client devices associated with the first access point;
determining that at least one client device is associated with the first access point;
determining that the at least one client device is capable of associating with a second access point;
forcing the at least one client device to roam to the second access point; and
transmitting a signal to the first access point to switch to a power save mode, wherein the signal represents a determination that no client device is associated with the first access point.

17. The non-transitory computer readable medium of claim 16 , further operable to select processing logic in the first access point to switch to the power save mode and to switch the processing logic to the power save mode responsive to the signal.

18. The non-transitory computer readable medium of claim 17 , further operable to, in response to receiving a different wireless signal, send, from at least one wireless transceiver in the first access point, a wakeup signal to the processing logic, and
in response to the wakeup signal, operable to switch the processing logic out of the power save mode.

19. The non-transitory computer readable medium of claim 16 , further operable to:
select wherein at least one wireless transceiver in the first access point to switch to the power save mode, and
switch the at least one wireless transceiver to the power save mode responsive to the signal.

20. The non-transitory computer readable medium of claim 19 , further operable to receive, at processing logic in the first access point, a different signal from a controller to send a wakeup signal to the at least one wireless transceiver;
send, from the processing logic, the wakeup signal to the at least one wireless transceiver, and
in response to the wakeup signal, switching the at least one wireless transceiver out of the power save mode.

Assignees

• Cisco Tech Inc

Inventors

• Carty Clark
• Metsker Corey
• Jones Chad
• Bowser Robert

Classifications

• G06F1/3253

  Power saving in bus · CPC title

• G06F1/3203

  Power management, i.e. event-based initiation of a power-saving mode · CPC title

• Y02D70/142

  Cross-Sectional Technologies · mapped topic

• H04W52/0235 Primary

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

• Y02D70/22

  Cross-Sectional Technologies · mapped topic