Apparatus and method for adjusting a duty cycle to save power in a computing system

• US 8,264,995 B2
• Filed: 12/29/2009
• Issued: 09/11/2012
• Est. Priority Date: 12/23/2004
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Winterton, Richard R.
• Primary Examiner(s): Hailu, Kibrom T
• Assistant Examiner(s): Chery, Dady
• Application Number:
  US12/655,430
• Publication Number:
  US 20100115069A1
• Time in Patent Office: 987 Days
• Field of Search: 370/311, 370/318, 370/229, 370/231, 370/463, 370/419, 370/401, 370/465, 370/459, 370/458, 370/450, 370/394, 370/420, 370/522, 713/300, 713/320, 713/323, 713/324, 713/330, 713/340, 455/522
• US Class Current: 370/311
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 47/365 Dynamic adaptation of the packet size
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and system for adjusting a duty cycle to save power in a computing system is described. The system includes a network interface card (NIC) that has an active mode and a sleep mode. The NIC is coupled to an adjusting element that adjusts a duty cycle of the active time to the sleep time based at least in part on minimizing power consumption.

Claims

1. A method comprising:

receiving data on a computing device, the received data for consumption by an entity communicatively coupled to the computing device, the computing device having an active mode in which data are received and a sleep mode in which data are not received, wherein a duty cycle of the computing device is determined by a first time in which the computing device is in the active mode and a second time in which the computing device is in the sleep mode;

adaptively adjusting the duty cycle of the computing device, based at least in part on a rate at which the received data is utilized by the entity;

determining a signal strength for the computing device; and

determining a packet size for packet transfers to the computing device, based at least in part on the determined signal strength;

wherein adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device, based at least in part on the packet size; and

wherein determining the packet size for packet transfers to the computing device, based at least in part on the determined signal strength comprises checking a lookup table to determine which packet size is a best match for the determined signal strength.

2. The method of claim 1 wherein

adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device to minimize power consumption.

3. The method of claim 1 wherein

adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device, based at least in part on a type of content to be received by the computing device.

4. The method of claim 1 wherein

the active mode and the sleep mode operate in accordance with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 specification.

5. The method of claim 1 further comprising:

determining whether the computing device is communicatively coupled to a wireless network, wherein adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device based at least in part on whether the computing device is communicatively coupled to a wireless network.

6. A computing device comprising:

a memory;

a network interface card (NIC) coupled to the memory, the NIC to receive data on the computing device, the received data for consumption by an entity communicatively coupled to the computing device, the computing device having an active mode in which data are received and a sleep mode in which data are not received, wherein a duty cycle of the computing device is determined by a first time in which the computing device is in the active mode and a second time in which the computing device is in the sleep mode; and

an adjusting element coupled to the NIC to adaptively adjust the duty cycle of the computing device, based at least in part on a rate at which the received data is utilized by the entity;

wherein the adjusting element is configured to determine a signal strength for the computing device;

wherein the adjusting element is configured to determine a packet size for packet transfers to the computing device, based at least in part on the determined signal strength;

wherein adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device, based at least in part on the packet size; and

wherein determining the packet size for packet transfers to the computing device, based at least in part on the determined signal strength comprises checking a lookup table to determine which packet size is a best match for the determined signal strength.

7. The computing device of claim 6 wherein

adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device to minimize power consumption.

8. The computing device of claim 6 wherein

adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device, based at least in part on a type of content to be received by the computing device.

9. The computing device of claim 6 wherein

the active mode and the sleep mode operate in accordance with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 specification.

10. The computing device of claim 6 wherein the adjusting element further performs operations comprising:

determining whether the computing device is communicatively coupled to a wireless network, wherein adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device based at least in part on whether the computing device is communicatively coupled to a wireless network.

11. A computer program product comprising:

a non-transitory computer readable storage medium;

instructions in the computer-readable storage medium, wherein the instructions, when executed by a processor in a computing device, cause the computing device to;

receive data on the computing device, the received data for consumption by an entity communicatively coupled to the computing device, the computing device having an active mode in which data are received and a sleep mode in which data are not received, wherein a duty cycle of the computing device is determined by a first time in which the computing device is in the active mode and a second time in which the computing device is in the sleep mode;

adaptively adjust the duty cycle of the computing device, based at least in part on a rate at which the received data is utilized by the entity;

determine a signal strength for the computing device; and

determine a packet size for packet transfers to the computing device, based at least in part on the determined signal strength;

wherein adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device, based at least in part on the packet size; and

wherein determining the packet size for packet transfers to the computing device, based at least in part on the determined signal strength comprises checking a lookup table to determine which packet size is a best match for the determined signal strength.

12. The computer program product of claim 11 wherein

adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device to minimize power consumption.

13. The computer program product of claim 11 wherein

adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device, based at least in part on a type of content to be received by the computing device.

14. The computer program product of claim 11 wherein

the active mode and the sleep mode operate in accordance with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 specification.

15. The computer program product of claim 11 wherein the instructions further cause the computing device to:

determine whether the computing device is communicatively coupled to a wireless network, wherein adaptively adjusting the duty cycle of the computing device comprises adaptively adjusting the duty cycle of the computing device based at least in part on whether the computing device is communicatively coupled to a wireless network.

16. A method comprising:

receiving, at a computing device, data from an entity communicatively coupled to the computing device, the computing device having an active mode in which data are received and a sleep mode in which data are not received, wherein a duty cycle of the computing device is determined by a first time in which the computing device is in the active mode and a second time in which the computing device is in the sleep mode;

determining a signal strength for the computing device;

determining a packet size for packet transfers to the computing device, based at least in part on the determined signal strength;

determining whether the computing device is communicatively coupled to a wireless network; and

in response to a determination that the computing device is communicatively coupled to the wireless network, adaptively adjusting the duty cycle of the computing device, based at least in part on a rate at which the received data is utilized.

17. The method of claim 16, wherein the operation of adaptively adjusting the duty cycle of the computing device comprises:

adaptively adjusting the duty cycle of the computing device to minimize power consumption.

18. The method of claim 16, wherein the operation of adaptively adjusting the duty cycle of the computing device comprises:

adaptively adjusting the duty cycle of the computing device, based at least in part on a type of content to be received by the computing device.

19. The method of claim 16, wherein the active mode and the sleep mode operate in accordance with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specification.

20. A computer program product comprising:

a non-transitory computer readable storage medium; and

instructions in the computer-readable storage medium, wherein the instructions, when executed by a processor in a computing device, enable the computing device to;

receive data from an entity communicatively coupled to the computing device, the computing device having an active mode in which data are received and a sleep mode in which data are not received, wherein a duty cycle of the computing device is determined by a first time in which the computing device is in the active mode and a second time in which the computing device is in the sleep mode;

determine a signal strength for the computing device;

determine a packet size for packet transfers to the computing device, based at least in part on the determined signal strength;

determine whether the computing device is communicatively coupled to a wireless network; and

in response to a determination that the computing device is communicatively coupled to the wireless network, adaptively adjust the duty cycle of the computing device based at least in part on a rate at which the received data is utilized.

21. The computer program product of claim 20, wherein the operation of adaptively adjusting the duty cycle of the computing device comprises:

adaptively adjusting the duty cycle of the computing device to minimize power consumption.

22. The computer program product of claim 20, wherein the operation of adaptively adjusting the duty cycle of the computing device comprises:

adaptively adjusting the duty cycle of the computing device based at least in part on a type of content to be received by the computing device.

23. The computer program product of claim 20 wherein the active mode and the sleep mode operate in accordance with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 specification.

24. A computing device comprising:

a processor;

a non-transitory computer readable storage medium responsive to the processor; and

instructions in the computer-readable storage medium, wherein the instructions, when executed by the processor, enable the computing device to;

receive data from an entity communicatively coupled to the computing device, the computing device having an active mode in which data are received and a sleep mode in which data are not received, wherein a duty cycle of the computing device is determined by a first time in which the computing device is in the active mode and a second time in which the computing device is in the sleep mode;

determine a signal strength for the computing device;

determine a packet size for packet transfers to the computing device, based at least in part on the determined signal strength;

determine whether the computing device is communicatively coupled to a wireless network; and

in response to a determination that the computing device is communicatively coupled to the wireless network, adaptively adjust the duty cycle of the computing device based at least in part on a rate at which the received data is utilized.

25. The computing device of claim 24, wherein the operation of adaptively adjusting the duty cycle of the computing device comprises:

adaptively adjusting the duty cycle of the computing device to minimize power consumption.

26. The computing device of claim 24, wherein the operation of adaptively adjusting the duty cycle of the computing device comprises:

adaptively adjusting the duty cycle of the computing device based at least in part on a type of content to be received by the computing device.

27. The computing device of claim 24 wherein the active mode and the sleep mode operate in accordance with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 specification.