Event-based multichannel direct link

• US 20050036469A1
• Filed: 06/30/2004
• Published: 02/17/2005
• Est. Priority Date: 06/12/2002
• Status: Active Grant

• Current Assignee: Ozmo Licensing LLC
• Original Assignee: Globespan Virata, Inc.
• Inventors: Wentink, Menzo
• Granted Patent: US 7,251,235 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 7/2126 using a reference station
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• 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: H04W 92/18 between terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Disclosed herein are exemplary techniques for the communication of information in a wireless system by 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, where the direct link setup is conducted over a base channel and the direct link is established on a parallel channel. The two or more wireless devices may switch to the parallel channel and use the established direct link to communicate information directly without the access point as an intermediary. In anticipation of a predetermined event, such as the transmission of a delivery traffic indication map (DTIM) beacon frame by the access point, the two or more wireless devices may switch back to the base channel so that uplink, downlink and/or peer-to-peer information may be transmitted and/or received.

Claims

1. In a wireless network comprising an access point logically connected to at least a first wireless device and a second wireless device, a method comprising:

communicating information directly between the first and second wireless devices.

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

switching the first and second wireless devices from a first channel to a second channel in anticipation of a predetermined event; and

communicating information between the access point and at least one of the first and second wireless devices via the second channel for at least a portion of a second period.

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

switching the first and second wireless devices from the second channel to the first channel prior to the first period.

4. The method as in claim 2, further comprising:

switching the first and second wireless devices to a third channel; and

communicating, for a third period, information between the first and second wireless devices via the second wireless direct link.

5. The method as in claim 4, wherein switching the wireless devices to the third channel comprises:

providing a setup confirmation from the first wireless device to the second wireless device via the access point, the setup confirmation confirming the suitability of a wireless direct link on the third channel;

switching the first wireless device to the third channel subsequent to the transmission of the setup confirmation; and

switching the second wireless device to the third channel subsequent to the receipt of the setup confirmation.

6. The method as in claim 5, wherein establishing the second wireless direct link on the third channel comprises:

providing, on the second channel, a setup request from the first wireless device to the second wireless device via the access point, the setup request including one or more identifiers of the third channel; and

providing, on the second channel, an affirmative setup response from the second wireless device to the second wireless device via the access point in response to a receipt of the setup request at the second device;

wherein the setup confirmation is provided in response to a receipt of the affirmative setup response at the first wireless device.

7. The method as in claim 6, wherein the one or more identifiers of the third channel includes a center frequency and a channel width.

8. The method as in claim 7, further comprising:

scanning at least one channel to identify an unused channel, the unused channel being selected as the third channel.

9. The method as in claim 7, further comprising:

randomly selecting one of a plurality of channels as the third channel.

10. The method as in claim 2, wherein the predetermined event includes a substantially periodic event.

11. The method as in claim 10, wherein the predetermined event includes a periodic transmission of an indication of information buffered at the access point, wherein at least a portion of the buffered information is intended for receipt by at least one of the first and second wireless devices.

12. The method as in claim 11, wherein the indication from the access point includes a delivery traffic indication map (DTIM) beacon frame.

13. The method as in claim 10, wherein the predetermined event includes the delivery of broadcast and multicast data.

14. The method as in claim 1, wherein the second channel includes a base channel for communicating information between the access point to at least the first and second wireless devices.

15. In a wireless network comprising an access point operably connected to at least a first wireless device and a second wireless device, a method comprising:

providing information between the access point and at least one of the first and second wireless devices via a first channel for at least a portion of a first period;

providing a channel change request from the first wireless device to the second wireless device on the first channel;

providing an affirmative response to the channel change request from the second wireless device to the first wireless device on the first channel;

switching the second wireless device to a second channel subsequent to the receipt of the acknowledgement to the provision of the affirmative response to the channel change request;

switching the first wireless device to the second channel subsequent to the transmission of the acknowledgement to the receipt of the affirmative response to the channel change request; and

communicating information directly between the first and second wireless devices via the second channel for at least a portion of a second period.

16. The method as in claim 15, wherein the channel change request includes an indication of a proposed center frequency and channel width for the second channel and wherein the affirmative response to the channel change request includes an affirmation of the proposed center frequency and channel width for the second channel.

17. The method as in claim 15, wherein the information communicated during at least a portion of the second period includes information buffered at the access point during the first period and having at least one of the first and second wireless devices as an intended recipient.

18. The method as in claim 15, wherein the first and second wireless devices switch from the first channel to the second channel in anticipation of a predetermined event.

19. The method as in claim 18, wherein the predetermined event includes a substantially periodic event.

20. The method as in claim 19, wherein the predetermined event includes a periodic transmission of an indication of information buffered at the access point, wherein at least a portion of the buffered information is intended for receipt by at least one of the first and second wireless devices.

21. The method as in claim 20, wherein the indication from the access point includes a delivery traffic indication map (DTIM) frame.

22. In a wireless network having an access point, a wireless device comprising:

a transceiver; and

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

facilitate an establishment of a wireless direct link between the wireless device and another wireless device via a second channel;

communicate information with the other wireless device via the wireless direct link for at least a portion of a first period;

switch the transceiver from the first channel to a second channel in anticipation of a predetermined event; and

communicate information with the access point via second channel for at least a portion of a second period.

23. The wireless device as in claim 22, wherein the direct link module is adapted to facilitate the establishment of the wireless direct link by:

providing a channel setup request to the other wireless device via the access point and the second channel;

receiving an affirmative response to the setup request from the other wireless device via the first channel;

providing a setup confirmation to the other wireless device via the first channel; and

tuning the transceiver to the second channel subsequent to the provision of the setup confirmation.

24. The wireless device as in claim 23, wherein the setup request includes an indication of a proposed center frequency and channel width for the second channel.

25. The wireless device as in claim 22, wherein the direct link module is adapted to facilitate the establishment of the wireless direct link by:

receiving a channel setup request from the other wireless device via the access point and the first channel;

providing an affirmative response to the setup request to the other wireless device via the first channel;

receiving a setup confirmation from the other wireless device via the first channel; and

tuning the transceiver to the second channel subsequent to the receipt of the setup confirmation.

26. The wireless device as in claim 25, wherein the setup request includes an indication of a proposed center frequency and channel width for the second channel.

27. The wireless device as in claim 26, wherein the direct link module is adapted to facilitate the establishment of the wireless direct link by:

providing a channel change request to the other wireless device via the access point;

receiving an affirmative response to the channel request from the other wireless device via the access point;

tuning the transceiver to the second channel subsequent to the receipt of the affirmative response.

28. The wireless device as in claim 22, wherein the direct link module is adapted to facilitate the establishment of the wireless direct link by:

receiving a channel change request from the other wireless device via the access point;

providing an affirmative response to the channel request to the other wireless device via the access point; and

tuning the transceiver to the second channel subsequent to the provision of the affirmative response.

29. The wireless device as in claim 22, wherein the predetermined event includes a substantially periodic event.

30. The wireless device as in claim 29, wherein the predetermined event includes a periodic transmission of an indication of information buffered at the access point during the first period, wherein at least a portion of the buffered information is intended for receipt by at least one of the first and second wireless devices.

31. The wireless device as in claim 30, wherein the indication from the access point includes a delivery traffic indication map (DTIM) frame.

32. The wireless device as in claim 22, further comprising:

at least one processor; and

wherein the direct link module includes executable instructions adapted to manipulate the processor to;

facilitate the establishment of the wireless direct link;

communicate information with the other wireless device via the wireless direct link;

switch the transceiver from the first channel to the second channel in anticipation of the predetermined event; and

communicate information with the access point via the wireless direct link on the second channel.

33. A wireless system comprising:

an access point; and

at least a first wireless device and a second wireless device;

wherein the first wireless device and the second wireless device are adapted to;

communicate information via a wireless direct link on a first channel during at least a portion of a first period;

switch to a second channel in anticipation of a predetermined event; and

communicate information with the access point on the second channel during at least a portion of a second period.

34. The wireless system as in claim 33, wherein the predetermined event includes a substantially periodic event.

35. The wireless system as in claim 34, wherein the predetermined event includes a periodic transmission of an indication of information buffered at the access point during the first period, wherein at least a portion of the buffered information is intended for receipt by at least one of the first and second wireless devices.

36. The wireless system as in claim 35, wherein the indication from the access point includes a delivery traffic indication map (DTIM) frame.