Method and apparatus for managing power in network interface modules

• US 7,340,615 B2
• Filed: 01/31/2003
• Issued: 03/04/2008
• Est. Priority Date: 01/31/2003
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Moore, Timothy M., Abhishek, Abhishek, Ruan, Jiandong, Krantz, Anton W., Ayyagari, Arun, Barkley, Warren V., Geiger, Avi R.
• Primary Examiner(s): Elamin; A.
• Assistant Examiner(s): Chen; Tse
• Application Number:
  US10/355,412
• Publication Number:
  US 20040153676A1
• Time in Patent Office: 1,859 Days
• Field of Search: 713/300, 713/320
• US Class Current: 713/300
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3209 Monitoring remote activity, e.g. over telephone lines or network connections
• CPC Class Codes: G06F 1/325 Power saving in peripheral device
• CPC Class Codes: H04M 2250/06 including a wireless LAN interface
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and system for managing power consumption in a portable computing device having a network interface module is presented. A power management module receives inputs from other modules and determines when the network interface module is to be put in a doze state for a predetermined number of beacon intervals to conserve power consumption in the network interface module. The network interface module in a device that is associated with a network is put in the doze state after an event has occurred including when a scan has been performed, after a delayed sleep timer has expired, and after a beacon transmission has been completed and no traffic is buffered for the device. The delayed sleep time is set based on the estimated round trip time of a packet.

Claims

1. A method for managing power in a network interface module in a mobile device, the method comprising the steps of:

receiving through a programming interface a tag from an application, the tag being associated with a packet and indicating a fast response is required;

determining if the mobile device is being powered from a limited energy power source;

if the mobile device is being powered from the limited energy power source;

determining if the mobile device is associated with an access point;

if the mobile device is associated with an access point operating the network interface module in a power saving mode that is the lower power of;

a power saving mode set based on an analysis of packet traffic;

or

a fast power save mode or a maximum power saving mode set in response to the tag;

if the mobile device is not associated with an access point;

determining if the network interface module is scanning;

operating the network interface module in a constant awake mode if the network interface module is scanning; and

setting the network interface module to a doze mode if the network interface module is not scanning,

wherein;

the fast power save mode comprises;

a1) setting the network interface module to the doze mode between beacon intervals; and

b1) setting the network interface module to an on state to receive a beacon for each beacon interval; and

the maximum power saving mode comprises;

a2) setting the network interface module to the doze mode between listening intervals; and

b2) setting the network interface module to an on state to receive a beacon for each listening interval.

2. A method for managing power in a network interface module in a mobile device, the method comprising the steps of:

receiving through a user interface of the mobile device user preference information relating to power conservation;

determining if the mobile device is being powered from a limited energy power source;

if the mobile device is being powered from the limited energy power source;

determining if the mobile device is associated with an access point;

operating the network interface module in a fast power save mode or a maximum power saving mode if the mobile device is associated with an access point, the operating comprising operating the network interface module in the fast power save mode at a first time and operating the network interface module in the maximum power save mode at a second time, the first time and the second time being determined based on the user preference information, the operating further comprising setting a power saving mode based on a packet traffic analysis to take precedence over the user preference information; and

if the mobile device is not associated with an access point;

determining if the network interface module is scanning;

operating the network interface module in a constant awake mode if the network interface module is scanning; and

setting the network interface module to a doze mode if the network interface module is not scanning,

wherein operating the network interface module in the fast power save mode comprises, during operation at the first time, the steps of;

a) determining when the network interface module can enter the doze mode;

b) sending a notification to an access point that the network interface module is being set to the doze mode;

c) setting the network interface module to the doze mode after the notification has been sent;

d) setting the network interface module to an on state to receive a beacon for each beacon interval;

e) repeating steps b-f if the beacon indicates that no packets are queued for the mobile device; and

f) repeating steps a-f if the beacon indicates that at least one packet is queued for the mobile device.

3. The method of claim 2 further comprising the step of repeating steps a-f until the mobile device is disassociated with the access point or operation of the network interface module has been changed to the constant awake mode or the maximum power saving mode.

4. The method of claim 2 wherein the step of determining when the network interface module can enter the doze mode comprises determining that a delayed sleep timer has expired.

5. The method of claim 2 wherein the step of determining when the network interface module can enter the doze mode comprises determining that of a delayed sleep timer has expired, a scan has been completed, the beacon indicates that no traffic is queued for the mobile device, or a power source switches from a limited energy power source to a power line source.

6. The method of claim 2 wherein the step of sending a notification to the access point that the network interface module is being set to the doze mode comprises the step of sending the notification after all pending packets have been transmitted.

7. The method of claim 2 wherein the step of setting the network interface module to the doze mode after the notification has been sent comprises setting a transmit path of the network interface module to the doze mode and keeping a receive path of the network interface module powered.

8. A method for managing power in a network interface module in a mobile device, the method comprising the steps of:

determining if the mobile device is being powered from a limited energy power source;

if the mobile device is being powered from the limited energy power source;

determining if the mobile device is associated with an access point;

operating the network interface module in a fast power save mode or a maximum power saving mode if the mobile device is associated with an access point, the operating comprising selecting between a maximum power save mode and a fast power save mode, the selecting being based at least in part on information received from an application through an API and/or information from a user received through a user interface of the mobile device, the operating further comprising setting a power saving mode based on a packet traffic analysis to take precedence over the information received from the application through the API and/or the information from the user; and

if the mobile device is not associated with an access point;

determining if the network interface module is scanning;

operating the network interface module in a constant awake mode if the network interface module is scanning; and

setting the network interface module to a doze mode if the network interface module is not scanning.

9. The method of claim 8 wherein the step of operating the network interface module in the fast power save mode or the maximum power save mode includes selecting maximum power saving mode and comprises the steps of:

a) determining when the network interface module can enter the doze mode;

b) sending a notification to an access point that the network interface module is being set to a doze mode;

c) setting the network interface module to the doze mode after the notification has been sent;

d) setting the network interface module to an on state to receive a beacon after a listening interval has passed;

e) repeating steps b-f if the beacon indicates that no packets are queued for the mobile device; and

f) repeating steps a-f if the beacon indicates that at least one packet is queued for the mobile device.

10. The method of claim 9 further comprising the step of repeating steps a-f until the mobile device is disassociated with the access point or operation of the network inter-face module has been changed to the constant awake mode or the fast power saving mode.

11. The method of claim 9 wherein the step of determining when the network interface module can enter the doze mode comprises determining that a delayed sleep timer has expired.

12. The method of claim 9 wherein the step of determining when the network interface module can enter the doze mode comprises determining that one a delayed sleep timer has expired, a scan has been completed, the beacon indicates that no traffic is queued for the mobile device, or a power source switches from the limited energy power source to a power line source.

13. The method of claim 9, further comprising the step of setting the network interface module to the constant awake mode if the mobile device is being powered from a power line source.

14. The method of claim 9, further comprising the step of setting the network interface module to one of the constant awake mode, the fast power save mode and the maximum power save mode in accordance with a user preference.

15. The method of claim 9, further comprising the step of setting the network interface module to the constant awake mode if one of the mobile device is associated with the access point and the scan has been requested.

16. A computer storage medium having computer executable instructions for performing the steps of claim 9.

17. The computer storage medium of claim 16 having further computer executable instructions for performing a step of setting the network interface module to a constant awake mode if the mobile device is being powered from a power line source.

18. The computer storage medium of claim 16 having further computer executable instructions for performing a step of setting the network interface module to one of the constant awake mode, the fast power save mode or the maximum power save mode in accordance with a user preference.

19. The computer storage medium of claim 16 having further computer executable instructions for performing a step of setting the network interface module to the constant awake mode if one of the mobile device is associated or the scan has been requested.

20. The computer storage medium of claim 16 having further computer executable instructions for performing a step of operating the network interface module in the fast power save mode if an application tags a packet to indicate a fast response is required.

21. The computer storage medium of claim 16 having further computer executable instructions for performing a step of sending a notification to an access point that the network interface module is being set to the doze mode after all pending packets have been transmitted.

22. The computer storage medium of claim 16 having further computer executable instructions for performing a step of setting the network interface module to the doze mode after the notification has been sent comprises setting a transmit path of the network interface module to a doze mode and keeping a receive path of the network interface module powered.

23. The computer storage medium of claim 16 wherein the computer-executable instructions for performing a step of operating the network interface module in the fast power save mode or the maximum power saving mode if the mobile device is associated with a network comprises further computer-executable instructions for operating the network interface module in the fast power save mode according to steps comprising:

a) determining when the network interface module can enter a doze mode;

b) determining a delayed sleep time;

c) sending a notification to an access point that the network interface module is being set to the doze mode;

d) setting the network interface module to the doze mode after the notification has been sent;

e) setting the network interface module to an on state to receive a beacon for each beacon interval;

f) repeating steps c-g if the beacon indicates that no packets are queued for the mobile device; and

g) repeating steps a-g if the beacon indicates that at least one packet is queued for the mobile device.

24. The computer storage medium of claim 23 having further computer executable instructions for performing the step of repeating steps a-g until the mobile device is disassociated with the access point or operation of the network interface module has been changed to one of the constant awake mode or the maximum power saving mode.

25. The computer storage medium of claim 23 wherein the step of determining when the network interface module can enter a doze mode comprises determining that a delayed sleep timer has expired.

26. The computer storage medium of claim 23 wherein the step of determining when the network interface module can enter a doze mode comprises determining that one of a delayed sleep timer has expired, a scan has been completed, a beacon indicates that no traffic is queued for the mobile device, or a power source switches from a limited energy power source to a power line source.

27. The computer storage medium of claim 16 wherein the step of operating the network interface module in the fast power save mode or the maximum power saving mode if the mobile device is associated with a network comprises operating the network interface module in a maximum power save mode, the step of operating the network interface module in a maximum power save mode comprises the steps of:

a) determining when the network interface module can enter a doze mode;

b) determining a delayed sleep time;

c) sending a notification to an access point that the network interface module is being set to a doze mode;

d) setting the network interface module to the doze mode after the notification has been sent;

e) setting the network interface module to an on state to receive a beacon after a listening interval has passed;

f) repeating steps c-g if the beacon indicates that no packets are queued for the mobile device; and

g) repeating steps a-g if the beacon indicates that at least one packet is queued for the mobile device.

28. The computer storage medium of claim 27 having further computer executable instructions for performing the step of repeating steps a-g until one of the mobile device is disassociated with the access point or operation of the network interface module has been changed to one of the constant awake mode or the fast power saving mode.

29. The computer storage medium of claim 27 wherein the step of determining when the network interface module can enter a doze mode comprises determining that one of a delayed sleep timer has expired, a scan has been completed, a beacon indicates that no traffic is queued for the mobile device, or a power source switches from a limited energy power source to a power line source.