Method and system for supporting residual energy awareness in an ad hoc wireless communications network

• US 7,865,183 B2
• Filed: 12/01/2008
• Issued: 01/04/2011
• Est. Priority Date: 09/16/2003
• Status: Expired due to Fees

• Current Assignee: Intellectual Ventures I LLC (Intellectual Ventures LLC)
• Original Assignee: Spyder Navigations LLC (Intellectual Ventures LLC)
• Inventors: Reunamaki, Jukka, Kaaja, Harald, Celentano, Ulrico, Palin, Arto, Salokannel, Juha
• Primary Examiner(s): Gesesse; Tilahun
• Application Number:
  US12/325,906
• Publication Number:
  US 20090111532A1
• Time in Patent Office: 764 Days
• Field of Search: 455/41.1, 455/41.2, 455/426.1, 455/426.2, 455/574, 455/343.2, 455/343.4, 455/462, 455/465, 455/571, 455/343.1
• US Class Current: 455/426.1
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0277 according to available power supply, e.g. switching off when a low battery condition is detected
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of coordinating devices in a wireless network is provided. First capability data associated with a first type of power source and a first state of the power source of a first device is received at a second device. Second capability data is transmitted to the first device from the second device. The second capability data is associated with a second type of power source and a second state of the power source of the second device. The first capability data is compared with the second capability data at the second device. If the comparison indicates the first capability data is less desirable than the second capability data, the second capability data is transmitted again to the first device from the second device. If the comparison indicates the first capability data is more desirable than the second capability data, the first capability data is received again from the first device at the second device.

Claims

1. A method of coordinating devices in a wireless network, the method comprising:

receiving first capability data from a first device at a second device, the first capability data associated with a first type of power source in the first device and a first state of the power source of the first device;

transmitting second capability data to the first device from the second device, the second capability data associated with a second type of power source in the second device and a second state of the power source of the second device;

comparing the first capability data with the second capability data at the second device;

if the comparison indicates the first capability data is less desirable than the second capability data, transmitting the second capability data to the first device from the second device; and

if the comparison indicates the first capability data is more desirable than the second capability data, receiving the first capability data from the first device at the second device to determine a coordinator device to coordinate communications between the first device and the second device in a wireless network.

2. The method of claim 1, wherein receiving the first capability data is triggered by occurrence of an event.

3. The method of claim 2, wherein the event is a third device joining the wireless network.

4. The method of claim 3, further comprising the third device transmitting third capability data from the third device to the first device and to the second device, the third capability data associated with a third type of power source in the third device and a third state of the power source of the third device.

5. The method of claim 4, further comprising the third device receiving the first capability data from the first device and receiving the second capability data from the second device.

6. The method of claim 2, wherein the event is a current coordinator device leaving the wireless network.

7. The method of claim 2, wherein the event is a change in the second capability data.

8. The method of claim 7, wherein the change in the second capability data is a change in a residual energy status of the second device.

9. The method of claim 1, wherein transmitting the second capability data is triggered by occurrence of an event.

10. The method of claim 1, wherein the first capability data is less desirable than the second capability data if the first type of power source is a battery and the second type of power source is a fixed power supply.

11. The method of claim 1, wherein the first capability data is less desirable than the second capability data if the first state of the power source of the first device is less than the second state of the power source of the second device.

12. The method of claim 1, wherein the first capability data is received in a capability field format.

13. The method of claim 1, wherein the first capability data is repeatedly received.

14. The method of claim 1, further comprising determining the second capability data by identifying a value of a priority level based at least partially on the second type of power source in the second device and the second state of the power source of the second device.

15. The method of claim 1, further comprising determining the second capability data by determining a residual energy class based at least partially on the second type of power source in the second device and the second state of the power source of the second device.

16. The method of claim 15, wherein the residual energy class is determined as a first class if the second device receives power from a fixed power supply, as a second class if a residual energy percentage level of the second device is greater than a first percentage value, and as a third class if a residual energy percentage level of the second device is less than a second percentage value.

17. The method of claim 1, wherein the second capability data is transmitted in response to a handover command.

18. The method of claim 1, wherein the second capability data is transmitted in a handover command.

19. A memory including computer-readable instructions that, upon execution by a processor, cause a computing device to:

determine first capability data associated with a first type of power source in the computing device and a first state of the power source of the computing device;

transmit the determined first capability data to a second device;

receive second capability data from the second device, the second capability data associated with a second type of power source in the second device and a second state of the power source of the second device;

compare the first capability data with the second capability data at the computing device;

if the comparison indicates the first capability data is less desirable than the second capability data, transmit determined first capability data to the second device; and

if the comparison indicates the first capability data is more desirable than the second capability data, receive the second capability data from the second device to determine a coordinator device to coordinate communications between the computing device and the second device in a wireless network.

20. A device comprising:

an antenna configured to send and receive data in a wireless network;

a processor; and

a memory including computer-readable instructions that, upon execution by the processor, cause the device to

determine first capability data associated with a first type of power source in the device and a first state of the power source of the device;

transmit the determined first capability data to a second device in the wireless network;

receive second capability data from the second device, the second capability data associated with a second type of power source in the second device and a second state of the power source of the second device;

compare the first capability data with the second capability data at the computing device;

if the comparison indicates the first capability data is less desirable than the second capability data, transmit determined first capability data to the second device; and

if the comparison indicates the first capability data is more desirable than the second capability data, receive the second capability data from the second device to determine a coordinator device to coordinate communications in the wireless network.