Time-scheduled multichannel direct link

• US 20050157674A1
• Filed: 06/30/2004
• Published: 07/21/2005
• Est. Priority Date: 10/31/2003
• Status: Abandoned Application

• Current Assignee: Xocyst Transfer AG LLC (Intellectual Ventures LLC)
• Original Assignee: GlobespanVirata, Inc. (Synaptics Incorporated)
• Inventors: Wentink, Menzo
• Application Number:
  US10/880,325
• Publication Number:
  US 20050157674A1
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/2126 using a reference station
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Disclosed herein are exemplary techniques for communicating information in a wireless system using multiple wireless channels. A direct link between two or more wireless devices may be established by performing a direct link setup between two or more wireless devices using an access point. The two or more wireless devices may switch to a parallel channel and use the established direct link to communicate information directly without the access point as an intermediary. Switching the wireless devices between a base channel and one or more parallel channels may be accomplished using one or more predetermined channel schedules.

Claims

1. In a wireless network comprising an access point wirelessly connected to a plurality of wireless devices, each of the wireless devices having a wireless direct link with at least one other wireless device, the method comprising:

scheduling, at each of the wireless devices, a plurality of channel switches for the wireless device during a first interval based at least in part on channel scheduling information for the first interval;

wherein at least one channel switch includes a switch to a parallel channel to communicate information via a wireless direct link on the parallel channel for a first portion of the first interval.

2. The method as in claim 1, wherein at least one channel switch includes a channel switch to a base channel to communicate information with the access point on the base channel for a second portion of the first interval.

3. The method as in claim 2, wherein the first portion occurs prior to the second portion.

4. The method as in claim 2, wherein the second portion occurs prior to the first portion.

5. The method as in claim 2, wherein the channel switch to the parallel channel includes a channel switch from the base channel.

6. The method as in claim 1, further comprising:

providing, from the access point, the channel scheduling information to the wireless devices.

7. The method as in claim 6, wherein the first interval is a beacon interval and providing the channel scheduling information comprises:

providing a beacon frame having the channel scheduling information at a beginning of the beacon interval.

8. The method as in claim 1, wherein the channel scheduling information for the first interval includes a start time and a stop time for the first portion of the first interval.

9. The method as in claim 1, further comprising:

scheduling, at each of the wireless devices, a plurality of channel switches for the wireless device during a second interval based at least in part on channel scheduling information for the second interval;

wherein at least one channel switch includes a switch to a parallel channel to communicate information via a wireless direct link on the parallel channel for a first portion of the second interval.

10. In a wireless network comprising an access point wirelessly connected to at least two wireless devices, a method comprising:

receiving, at a first wireless device, channel scheduling information for a first interval;

tuning the first wireless device to a first channel for a first portion of the first interval;

communicating information between the first wireless device and at least a second wireless device via a wireless direct link on the first channel during the first portion of the first interval; and

tuning the first wireless device to a second channel for a second portion of the first interval;

wherein a timing of the first portion of the first interval and a timing of the second portion of the first interval are based at least in part on the channel scheduling information.

11. The method as in claim 10, further comprising:

communicating information between the first wireless device and the access point via the second channel during the second portion of the first interval.

12. The method as in claim 10, wherein receiving the channel scheduling information includes receiving a beacon frame including the channel scheduling information from the access point at a start of a beacon interval.

13. The method as in claim 10, wherein the channel scheduling information includes a start time and a stop time for the first portion of the first interval.

14. The method as in claim 13, wherein the second portion of the first interval includes a remaining portion of the first interval.

15. The method as in claim 10, further comprising:

tuning the first wireless device to a third channel for a third portion of the first interval; and

communicating information with at least the second wireless device via a second wireless direct link on the third channel during the third portion of the first interval;

wherein a timing of the third portion of the first interval is based at least in part on the channel scheduling information.

16. The method as in claim 10, further comprising:

tuning the first wireless device to a third channel for a first portion of a second interval;

communicating information between the first wireless device and at least the second wireless device via a wireless direct link on the third channel during the first portion of the second interval;

tuning the first wireless device to the second channel for a second portion of the second interval; and

communicating information between the first wireless device and the access point via the second channel during the second portion of the second interval.

17. The method as in claim 16, wherein a timing of the first portion of the second interval and a timing of the second portion of the second interval are based at least in part on the channel scheduling information for the first interval.

18. The method as in claim 16, further comprising:

receiving, at the first wireless device, channel scheduling information for the second interval;

wherein a timing of the first portion of the second interval and a timing of the second portion of the second interval are based at least in part on the channel scheduling information for the second interval.

19. The method as in claim 10, further comprising:

receiving, at a third wireless device, channel scheduling information for the first interval;

tuning the third wireless device to the second channel for the first portion of the first interval;

communicating information between the third wireless device and the access point on the second channel during the first portion of the first interval;

tuning the third wireless device to the first channel for the second portion of the first interval; and

communicating information between the third wireless device and at least a fourth wireless device via a second wireless direct link on the first channel during the second portion of the first interval.

20. The method as in claim 10, further comprising:

receiving, at a third wireless device, channel scheduling information for the first interval;

tuning the third wireless device to the second channel for the first portion of the first interval;

communicating information between the third wireless device and the access point on the second channel during the first portion of the first interval;

tuning the third wireless device to a third channel for the second portion of the first interval; and

communicating information between the third wireless device and at least a fourth wireless device via a second wireless direct link on the third channel during the second portion of the first interval.

21. The method as in claim 10, wherein the first portion occurs before the second portion.

22. The method as in claim 10, wherein the second portion occurs before the first portion.

23. In a wireless network comprising an access point wirelessly connected to a plurality of wireless devices, wherein each of the wireless devices has a wireless direct link with at least one other wireless device, the method comprising:

determining a channel schedule for each of the wireless direct links for a first interval, wherein the channel schedule information for a wireless direct link provides for at least one channel switch for the wireless devices associated with the wireless direct link during the first interval and where at least one of the channel switches includes a channel switch to a parallel channel to communicate information via the wireless direct link on the parallel channel for a first portion of the first interval; and

providing channel schedule information to the wireless devices for scheduling one or more channel switches during the first interval.

24. The method as in claim 23, wherein at least one of the channel switches includes a channel switch to a base channel to communicate information with the access point on a base channel for a second portion of the first interval.

25. The method as in claim 24, wherein the first portion occurs prior to the second portion.

26. The method as in claim 24, wherein the second portion occurs prior to the first portion.

27. The method as in claim 23, wherein the first interval is a beacon interval and providing the channel scheduling information comprises:

providing a beacon frame having the channel scheduling information from the access point at a beginning of the beacon interval.

28. The method as in claim 23, wherein the channel scheduling information for the first interval includes a start time and a stop time for the first portion of the first interval.

29. In a wireless network, a wireless device comprising:

a transceiver; and

a direct link module operably connected to the transceiver and being adapted to;

receive channel scheduling information for a first interval;

tune the transceiver to a first channel for a first portion of the first interval;

communicate information with at least one other wireless device via a wireless direct link on the first channel during the first portion of the first interval; and

tune the transceiver to a second channel for a second portion of the first interval;

wherein a timing of the first portion of the first interval and a timing of the second portion of the first interval are based at least in part on the channel scheduling information.

30. The wireless device as in claim 29, wherein the direct link module is further adapted to communicate information with an access point via the second channel during the second portion of the first interval.

31. The wireless device as in claim 29, wherein the channel scheduling information is received as part of a beacon frame transmitted from the access point at a start of a beacon interval.

32. The wireless device as in claim 29, wherein the channel scheduling information includes a start time and a stop time for the first portion of the first interval.

33. The wireless device as in claim 32, wherein the second portion of the first interval includes a remaining portion of the first interval.

34. The wireless device as in claim 29, wherein the direct link module is further adapted to:

tune the transceiver to a third channel for a third portion of the first interval; and

communicate information with at least one other wireless device via a second wireless direct link on the third channel during the third portion of the first interval;

wherein a timing of the third portion of the first interval is based at least in part on the channel scheduling information.

35. The wireless device as in claim 29, wherein the direct link module is further adapted to:

tune the transceiver to a third channel for a first portion of a second interval;

communicate information with at least one other wireless device via a wireless direct link on the third channel during the first portion of the second interval;

tuning the first wireless device to the second channel for a second portion of the second interval; and

communicating information with the access point via the second channel during the second portion of the second interval.

36. The wireless device as in claim 29, wherein the first portion occurs before the second portion.

37. The wireless device as in claim 29, wherein the second portion occurs before the first portion.

38. The wireless device as in claim 29, further comprising at least one processor operably connected to the transceiver, and wherein the direct link module comprises executable instructions adapted to manipulate the at least one processor to:

receive the channel scheduling information for the first interval;

tune the transceiver to the first channel for the first portion of the first interval;

communicate information with at least one other wireless device via the wireless direct link on the first channel during the first portion of the first interval;

tune the transceiver to the second channel for the second portion of the first interval.

39. The wireless device as in claim 38, wherein the executable instructions are further adapted to manipulate the one or more processors to communicate information with the access point via the second channel during the second portion of the first interval.

40. An access point wirelessly connected to a plurality of wireless devices, wherein each of the wireless devices has a wireless direct link with at least one other wireless device, the access point comprising:

a transceiver; and

a channel scheduling module operably connected to the transceiver and adapted to;

determine channel schedule information for the wireless direct links for a first interval, wherein the channel schedule information for a wireless direct link provides for at least one channel switch for the wireless devices associated with the wireless direct link during the first interval and where at least one of the channel switches includes a channel switch to a parallel channel to communicate information via the wireless direct link on the parallel channel for a first portion of the first interval; and

provide the channel schedule information to the wireless devices for scheduling one or more channel switches during the first interval via the transceiver.

41. The access point as in claim 40, wherein at least one of the channel switches includes a channel switch to a base channel to communicate information with the access point on the base channel for a second portion of the first interval.

42. The access point as in claim 40, wherein the first interval is a beacon interval and the channel scheduling module is adapted to provide the channel scheduling information by providing a beacon frame having the channel scheduling information at a beginning of the beacon interval.

43. The access point as in claim 40, wherein the channel scheduling information for the first interval includes a start time and a stop time for the first portion of the first interval.

44. The access point as in claim 40, further comprising at least one processor operably connected to the transceiver, and wherein the channel scheduling module includes executable instructions adapted to manipulate the at least one processor to:

determine the channel schedule information for the wireless direct links for the first interval; and

provide the channel schedule information to the wireless devices for scheduling channel switches during the first interval via the transceiver.