Device synchronization on a communication network

• US 7,912,033 B2
• Filed: 01/04/2006
• Issued: 03/22/2011
• Est. Priority Date: 05/31/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Olympus Corporation
• Inventors: Heidari-Bateni, Ghobad, Czaja, Stanislaw
• Primary Examiner(s): PHAN, HUY Q
• Application Number:
  US11/325,763
• Publication Number:
  US 20060268891A1
• Time in Patent Office: 1,903 Days
• Field of Search: 370/350, 370/311, 370/324, 370/298, 370/503, 370/509, 370/510, 370/512
• US Class Current: 370/350
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method to enable scheduling communications activities for an electronic communication device configured to communicate across a communication network is provided. The method comprises the steps of scheduling a communication activity during a scheduling window such that the communication activity is scheduled to occur toward the end of a communication window; entering a power-save mode after the scheduling step; and transitioning from the power-save mode prior to the scheduled communication activity. In one embodiment the method can further include a step of conducting the scheduled communication activity and transitioning back to the power-save mode after a next communication activity is scheduled or be implemented to allow the step of conducting the scheduled communication activity and transitioning back to the power-save mode at the end of the next communication window. In one embodiment the transitioning step comprises the steps of awakening from the power-save mode and synchronizing with the communication network, wherein synchronizing can comprise the step of synchronizing with electronic communication device associated with the communication network.

Claims

1. A method of scheduling communications activities for an electronic communication device configured to communicate across a communication network, the network temporally organized into communication windows for network activities, a communication window comprising a scheduling window and a plurality of media access slots for data transmission, the method comprising the steps of:

a first electronic communication device scheduling a communication activity with second electronic communication device during a scheduling window by reserving a first media access slot;

the first electronic communication device entering a power-save mode after the scheduling step;

during a scheduled synchronization period prior to the scheduled communication activity, the first electronic communication device transitioning from the power-save mode into an active state, to perform synchronization with the second electronic communication device to synchronize with the network, wherein the scheduled synchronization period comprises a second media access slot reserved to occur prior to the first media access slot; and

the first electronic communication device remaining in the active state to conduct the scheduled communication activity.

2. The method of claim 1, wherein the scheduling step is performed such that the communication activity is scheduled to occur toward the end of a communication window.

3. The method of claim 1, wherein the scheduling step is performed such that the communication activity is scheduled to occur in temporal proximity to at least one other network activity.

4. The method of claim 1, further comprising the steps of conducting the scheduled communication activity and transitioning back to the power-save mode after a next communication activity is scheduled.

5. The method of claim 1, further comprising the steps of conducting the scheduled communication activity and transitioning back to the power-save mode at the end of the next communication window.

9. The method of claim 1, wherein the step of scheduling further comprises the step of scheduling the synchronization period with the second electronic communication device for synchronization, and the method further comprises the step of the first electronic communication device requesting assistance in resynchronization from the second electronic communication device, wherein the second electronic communication device transmits dummy frames during the synchronization period to assist in synchronization.

10. The method of claim 1, wherein the first and second electronic communication devices communicate regarding resynchronization through private handshaking.

11. The method of claim 1, wherein the power-save mode is at least one of a sleep mode and a deep-sleep mode, and wherein during the power-save mode the first device does not maintain network synchronization.

12. The method of claim 1, wherein the scheduling window is a beacon period.

13. The method of claim 1, wherein the communication window is a superframe.

6. The method of claim wherein the step of scheduling includes a step of scheduling the synchronization period with the second electronic communication device for synchronization with the communication network by reserving the second media access slot, and the method further comprises the steps of:

the first electronic communication device requesting assistance in synchronization from the second electronic communication device, and

the first electronic communication device relinquishing the reservation of the scheduled synchronization period to the second electronic communication device to enable the second electronic communication device to communicate information used for resynchronization to the first electronic communication device during the synchronization period.

7. The method of claim 6, wherein the synchronization period and the communication activity are scheduled in successive media access slots if multiple media access slots are available for reservation.

8. The method of claim 6, wherein the first and second electronic communication devices use a distributed reservation protocol reservation to coordinate their slots.

14. An electronic communication device configured for communication across a communication network, the network temporally organized into communication windows for network activities, a communication window comprising a scheduling window and a plurality of media access slots for data transmission, comprising a non-transitory medium having control logic embodied thereon, the control logic configured to cause the electronic communication device to perform the steps of:

performing a communication activity with a second electronic communication device;

scheduling the communication activity during a scheduling window by reserving a first, media access slot;

entering a power-save mode after the communication activity is scheduled;

during a scheduled synchronization period prior to the scheduled communication activity, transitioning from the power-save mode into an active state, to perform synchronization with the second electronic communication device to synchronize with the network, wherein the scheduled synchronization period comprises a second media access slot reserved to occur prior to the first media access slot; and

remaining in the active state to conduct the scheduled communication activity.

15. The electronic communication device of claim 14, wherein the control logic is further configured to cause the electronic communication device to schedule the communication at the end of a communication window.

16. The electronic communication device of claim 15, wherein the communication window is a superframe.

17. The electronic communication device of claim 14, wherein the control logic is further configured to cause the electronic communication device to schedule the communication in temporal proximity to at least one other network activity.

18. The electronic communication device of claim 14, wherein the control logic comprises at least one of hardware, software and a combination of hardware and software.

19. The electronic communication device of claim 14, wherein the control logic is configured to cause the electronic communication device to transition from the power-save mode for the scheduled communication activity and to transition back to the power-save mode after a next communication activity is scheduled.

20. The electronic communication device of claim 14, wherein the control logic is further configured to cause the electronic communication device to schedule the synchronization period with the second electronic communication device for synchronization with the communication network by reserving the second media access slot, request assistance in synchronization from the second electronic communication device, and relinquish the reservation of the scheduled synchronization period to the second electronic communication device to enable the second electronic communication device to communicate information used for resynchronization to the first electronic communication device during the synchronization period.

21. The electronic communication device of claim 14, wherein the control logic is further configured to cause the electronic communication device to schedule the synchronization period for synchronization with the communication network, request assistance in resynchronization from the second electronic communication device to enable the first electronic communication device to receive dummy frames from the second electronic communication device during the synchronization period to assist in synchronization.

22. The electronic communication device of claim 14, wherein the power-save mode is at least one of a sleep mode and a deep-sleep mode, and wherein during the power-save mode the first device does not maintain network synchronization.

23. In a distributed wireless communication network, a method of scheduling a communication activity for an electronic communication device associated with the network, the network temporally organized into communication windows for network activities, a communication window comprising a scheduling window and a plurality of media access slots, the method comprising the steps of:

a first electronic communication device scheduling a network communication activity for a communication window, the scheduling occurring during the scheduling window associated with that communication window, wherein, media access slots are available for reservation, the communication activity is scheduled to occur in one or more media access slots in temporal proximity to a second scheduling window associated with a second communications window;

the first electronic communication device entering a power-save mode after the communication activity and the second scheduling window; and

the first electronic communication device remaining in the power-save mode until prior to a next scheduled network activity.

24. The method of claim 23, wherein, media access slots are available for reservation, the communication activity is scheduled to occur during the media access slot closest to the end of the communication window;

the first electronic communication device enters a power-save mode after the communication activity is scheduled; and

the first electronic communication device remains in the power-save mode until prior to the scheduled communication activity.

25. The method of claim 23, wherein the second communication window is the same as the first communication window and, if multiple media access slots are available for reservation, the communication activity is scheduled to occur during the media access slot closest to the beginning of the communication window;

the first electronic communication device enters a power-save mode after the communication activity is conducted; and

the first electronic communication device remains in the power-save mode until prior to a next scheduling activity.

26. The method of claim 23, wherein the step of scheduling includes a step of the first electronic communication device scheduling one or more media access slots prior to the scheduled communication activity for synchronization of the first electronic communication device with the communication network, and the method further comprises the steps of:

the first electronic communication device requesting assistance in synchronization from a second electronic communication device associated with the communication network, and

the first electronic communication device relinquishing the scheduled synchronization slots to the second electronic communication device to communicate information used for synchronization.

27. The method of claim 26, wherein the synchronization period and the communication activity are scheduled in successive media access slots.

28. The method of claim 26, wherein the first and second electronic communication devices use a distributed reservation protocol reservation to coordinate their slots.

29. The method of claim 23, wherein the step of scheduling includes a step of the first electronic communication device scheduling one or more media access slots prior to the scheduled communication activity for synchronization of the first electronic communication device with the communication network, and the method further comprises the steps of:

the first electronic communication device offering assistance in synchronization to a second electronic communication device associated with the communication network, and

the first electronic communication device relinquishing the scheduled synchronization slots to the second electronic communication device to communicate information used for synchronization.

30. The method of claim 23, wherein the step of scheduling further comprises the step of the first electronic communication device scheduling a synchronization period comprising one or more media access slots, and the method further comprises the step of the first electronic communication device requesting assistance in resynchronization from a second electronic communication device associated with the communication network, wherein the second electronic communication device transmits dummy frames during the synchronization period to assist in synchronization.

31. The method of claim 23, wherein the step of scheduling further comprises the step of the first electronic communication device scheduling a synchronization period comprising one or more media access slots, and the method further comprises the step of the first electronic communication device offering assistance in resynchronization to a second electronic communication device associated with the communication network, wherein the second electronic communication device transmits dummy frames during the synchronization period to assist in synchronization.

32. In a distributed wireless communication network, a method of scheduling a communication activity for an electronic communication device associated with the network, the network temporally organized into superframes for network activities, a superframe comprising a scheduling window and a plurality of media access slots, the method comprising the steps of:

a first electronic communication device reserving a network communication activity time slot comprising one or more media access slots during a superframe, the reservation made on behalf of a second electronic communication device,

the first electronic communication device communicating information regarding the reservation to the second electronic communication device; and

the reservation including a reservation of one or more additional media access slots for the second electronic communication device to transmit information for device synchronization to the first electronic communication device.

33. The method of claim 32, wherein the reservation is communicated through handshaking between the first and second electronic communication devices.