Method and system for conserving battery power of mesh points in a mesh network

• US 20060253735A1
• Filed: 03/09/2006
• Published: 11/09/2006
• Est. Priority Date: 03/11/2005
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Rudolf, Marian, Kwak, Joseph
• Application Number:
  US11/371,592
• Publication Number:
  US 20060253735A1
• Time in Patent Office: Days
• US Class Current: 714/12
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: H04L 45/42 Centralised routing
• CPC Class Codes: H04W 40/10 based on available power or energy
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• 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: Y02D 30/70 in wireless communication networks

Abstract

A method and system for conserving power of battery-powered mesh points (MPs) in a mesh network are disclosed. In one embodiment, a centralized controller is provided in the mesh network. Each of the MPs signal information associated with conserving MP battery power and provide indications of battery power levels associated with the respective MPs to the centralized controller. The centralized controller optimizes the configuration of the mesh network based on the signaling information for conserving MP battery power and the battery power level indications. In an alternate embodiment, each of the MPs individually monitor traffic flowing through the respective MP and a level of battery power associated with the respective MP. Each of the MPs determine whether to activate a power saving function associated with the respective MP and signal information associated with conserving MP battery power to neighboring MPs in the mesh network.

Claims

1. In a mesh network including a plurality of battery-powered mesh points (MPs) and a centralized controller, a method for conserving the battery power of the MPs, the method comprising:

(a) the MPs signaling information associated with conserving MP battery power to the centralized controller or to peer MPs;

(b) the MPs providing indications of battery power levels associated with the respective MPs to the centralized controller or to peer MPs; and

(c) the centralized controller or MPs optimizing the configuration of the mesh network based on the signaling information for conserving MP battery power and the battery power level indications.

2. The method of claim 1 further comprising:

(d) the centralized controller activating a power saving function in at least one of the MPs.

3. The method of claim 1 further comprising:

(d) the centralized controller coordinating the MPs to operate in a power saving mode during predetermined time periods.

4. The method of claim 1 wherein the centralized controller commands unused MPs to activate a power saving function.

5. The method of claim 1 wherein the centralized controller resides in a mesh portal connected to a backbone network.

6. The method of claim 5 wherein the backbone network is the Internet.

7. The method of claim 1 wherein the centralized controller configures the mesh network to minimize the number of MPs that do not have a power saving function activated.

8. The method of claim 2 wherein the activated power saving function is deactivated on a periodic basis such that the MP can listen for mesh beacons to determine whether the centralized controller or a peer MP desires to assign the MP to a routing path.

9. The method of claim 1 further comprising:

(d) at least one of the MPs signaling information associated with conserving MP battery power to another MP in the mesh network.

10. The method of claim 9 wherein the information signaled to the other MP indicates an intended power saving action.

11. The method of claim 9 wherein the information signaled to the other MP includes MP doze/awake cycle timing information.

12. The method of claim 1 wherein the information associated with conserving MP battery power includes at least one of a power source, a power save capability, a power save need, power saving features implemented by the MP and intended power saving actions.

13. The method of claim 1 wherein the information associated with conserving MP battery power is sent via layer 2 (L2) or layer 3 (L3) signaling.

14. The method of claim 1 wherein the information associated with conserving MP battery power is included in a capability field in a medium access control (MAC) header.

15. The method of claim 1 wherein the information associated with conserving MP battery power is sent in response to a request from the centralized controller.

16. The method of claim 1 wherein the information associated with conserving MP battery power is sent from the MPs to the centralized controller on a periodic basis.

17. The method of claim 1 wherein at least one of the MPs is configured to operate on two frequency channel s but conserves battery power by turning off at least one frequency channel to save battery power.

18. The method of claim 1 wherein at least one of the MPs enter a doze state to conserve battery power in accordance with the service period interval.

19. The method of claim 18 wherein the service period interval is negotiated between the MP and the centralized controller.

20. In a mesh network including a plurality of battery-powered mesh points (MPs), a method for conserving the battery power of the MPs, the method comprising:

(a) each of the MPs individually monitoring traffic flowing through the respective MP and a level of battery power associated with the respective MP;

(b) each of the MPs determining whether to activate a power saving function associated with the respective MP; and

(c) the MP signaling information associated with conserving MP battery power to neighboring MPs in the mesh network.

21. The method of claim 20 wherein the information associated with conserving MP battery power is sent by layer 2 (L2) or layer 3 (L3) signaling.

22. The method of claim 20 wherein the information associated with conserving MP battery power is included in a capability field in a medium access control (MAC) header.

23. A power efficient mesh network comprising:

(a) a plurality of battery-powered mesh points (MPs); and

(b) a centralized controller for conserving the battery power of the MPs, wherein the MPs signal information associated with conserving MP battery power and provide indications of battery power levels associated with the respective MPs to the centralized controller, and the centralized controller optimizes the configuration of the mesh network based on the signaling information for conserving MP battery power and the battery power level indications.

24. The mesh network of claim 23 wherein the centralized controller activates a power saving function in at least one of the MPs.

25. The mesh network of claim 23 wherein the centralized controller coordinates the MPs to operate in a power saving mode during predetermined time periods.

26. The mesh network of claim 23 wherein the centralized controller commands unused MPs to activate a power saving function.

27. The mesh network of claim 23 further comprising:

a mesh portal in which the centralized controller is incorporated therein, wherein the mesh network provides wireless transmit/receive units (WTRUs) with access to a backbone network via the mesh portal.

28. The mesh network of claim 27 wherein the backbone network is the Internet.

29. The mesh network of claim 23 wherein the centralized controller configures the mesh network to minimize the number of MPs that do not have a power saving function activated.

30. The mesh network of claim 24 wherein the activated power saving function is deactivated on a periodic basis such that the MP can listen for mesh beacons to determine whether the centralized controller desires to assign the MP to a routing path.

31. The mesh network of claim 23 wherein at least one of the MPs signals information associated with conserving MP battery power to another MP in the mesh network.

32. The mesh network of claim 31 wherein the information signaled to the other MP indicates an intended power saving action.

33. The mesh network of claim 31 wherein the information signaled to the other MP includes MP doze/awake cycle timing information.

34. The mesh network of claim 23 wherein the information associated with conserving MP battery power includes at least one of a power source, a power save capability, a power save need, power saving features implemented by the MP and intended power saving actions.

35. The mesh network of claim 23 wherein the information associated with conserving MP battery power is sent by layer 2 (L2) or layer 3 (L3) signaling.

36. The mesh network of claim 23 wherein the information associated with conserving MP battery power is included in a capability field in a medium access control (MAC) header.

37. The mesh network of claim 23 wherein the information associated with conserving MP battery power is sent in response to a request from the centralized controller.

38. The mesh network of claim 23 wherein the information associated with conserving MP battery power is sent from the MPs to the centralized controller on a periodic basis.

39. The mesh network of claim 23 wherein at least one of the MPs is configured to operate on two frequency channel s but conserves battery power by turning off at least one frequency channel to save battery power.

40. The mesh network of claim 23 wherein at least one of the MPs enter a doze state to conserve battery power in accordance with the service period interval.

41. The mesh network of claim 40 wherein the service period interval is negotiated between the MP and the centralized controller.

42. In a power efficient mesh network, a plurality of battery-powered mesh points (MPs) for routing traffic, each MP comprising:

(a) a monitoring unit configured to monitor traffic flowing through the respective MP and a level of battery power associated with the respective MP; and

(b) a power save controller, wherein the respective MP determines whether to activate a power save function controlled by the power save controller and signal information associated with conserving MP battery power to neighboring MPs in the mesh network.

43. The MP of claim 42 wherein the information associated with conserving MP battery power is sent by layer 2 (L2) or layer 3 (L3) signaling.

44. The MP of claim 42 wherein the information associated with conserving MP battery power is included in a capability field in a medium access control (MAC) header.

45. In a power efficient mesh network, a plurality of battery-powered mesh points (MPs) for routing traffic, each MP including an integrated circuit (IC) comprising:

(a) a monitoring unit configured to monitor traffic flowing through the respective MP and a level of battery power associated with the respective MP; and

(b) a power save controller, wherein the respective MP determines whether to activate a power save function controlled by the power save controller and signal information associated with conserving MP battery power to neighboring MPs in the mesh network.

46. The IC of claim 45 wherein the information associated with conserving MP battery power is sent by layer 2 (L2) or layer 3 (L3) signaling.

47. The IC of claim 45 wherein the information associated with conserving MP battery power is included in a capability field in a medium access control (MAC) header.

48. In a mesh network including a plurality of battery-powered mesh points (MPs), an MP configured for conserving battery power, the MP comprising:

a monitoring unit, the monitoring unit configured for monitoring the power requirements and the remaining battery power of the MP; and

a power save controller, the power save controller configured for triggering a power save mode if the power requirements exceed a predetermined threshold.

49. The MP of claim 48 wherein the predetermined threshold is based on the remaining battery power.

50. The MP of claim 48 wherein the power requirements include at least one of radio environment, and traffic flowing through the MP.

51. The MP of claim 48 wherein the monitoring unit is further configured for storing the traffic history and anticipating near term traffic flows.

52. The MP of claim 51 wherein the power requirements include the anticipated near term traffic flows.

53. The MP of claim 48 wherein triggering a power save mode includes notifying neighboring MPs of the triggering of the power save mode.

54. The MP of claim 53 wherein the MP notifies the neighboring MPs of the triggering of the power save mode by sending a null-data frame.

55. The MP of claim 48 wherein the power save controller is further configured to activate the MP at a predetermined time in order to listen to beacons.

56. The MP of claim 55 wherein the MP deactivates at the end of a service period.

57. The MP of claim 48 wherein the power save controller is further configured for activating the MP when the MP has traffic to transmit.