Systems and methods for implementing an enhanced multi-channel direct link protocol between stations in a wireless LAN environment

• US 7,542,452 B2
• Filed: 04/09/2004
• Issued: 06/02/2009
• Est. Priority Date: 04/09/2004
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Penumetsa, Sitarama
• Primary Examiner(s): Jackson; Blane J
• Application Number:
  US10/821,420
• Publication Number:
  US 20050226183A1
• Time in Patent Office: 1,880 Days
• Field of Search: 370/328, 370/329, 370/346, 370/338, 455/452.2, 455/67.11, 455/452.1, 455/445, 455/453
• US Class Current: 370/338
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

Systems and methods for implementing an enhanced multi-channel direct link protocol between wireless stations in a wireless LAN environment are disclosed. An exemplary method is implemented in a first wireless station that is part of an infrastructure basic service set network. The infrastructure basic service set network also includes an access point and a second wireless station. The wireless stations of the infrastructure basic service set network communicate on an infrastructure frequency channel. The method involves determining that at least one condition is satisfied for establishing a direct link with the second wireless station for transmission of data from the first wireless station to the second wireless station. The direct link is established with the second wireless station on a direct link frequency channel that is different than the infrastructure frequency channel. The data is transmitted to the second wireless station via the direct link.

Claims

1. A computer-readable medium for storing program data, wherein the program data comprises executable instructions for implementing a method in a first wireless station that is part of an infrastructure basic service set network, the infrastructure basic service set network also comprising an access point and a second wireless station, the wireless stations of the infrastructure basic service set network communicating on an infrastructure frequency channel, the method comprising:

determining that a number of consecutive frames generated at the first wireless station have a same destination address and exceed a threshold value;

a with the second wireless station on a direct link frequency channel that is different than the infrastructure frequency channel based on the determination; and

transmitting the data to the second wireless station via the direct link.

2. The computer-readable medium of claim 1, wherein after the data has been transmitted to the second wireless station the method further comprises:

terminating the direct link; and

rejoining the infrastructure basic service set network.

3. The computer-readable medium of claim 1, wherein while the direct link is established between the first wireless station and the second wireless station the method further comprises periodically tuning to the infrastructure frequency channel to receive beacons from the access point.

4. The computer-readable medium of claim 3, wherein the method further comprises:

receiving a beacon that comprises a notification about downlink data for the first wireless station that is buffered at the access point;

determining whether a condition is satisfied for terminating the direct link;

if the condition is satisfied, terminating the direct link and rejoining the infrastructure basic service set network; and

if the condition is not satisfied, tuning to the infrastructure frequency channel at scheduled time intervals to receive the downlink data from the access point.

5. The computer-readable medium of claim 3, wherein the method further comprises:

periodically tuning to the infrastructure frequency channel to receive every nth beacon; and

if the first wireless station does not see any buffered downlink data advertised in the beacons, increasing the value of n.

6. The computer-readable medium of claim 1, wherein the method further comprises:

obtaining unused frequency channels information about unused frequency channels near the first wireless station;

sending the unused frequency channels information to the access point; and

receiving the direct link frequency channel from the access point.

7. The computer-readable medium of claim 1, wherein the method further comprises:

determining that the destination address is in the infrastructure basic service set network.

8. A computer-readable medium for storing program data, wherein the program data comprises executable instructions for implementing a method in a second wireless station that is part of an infrastructure basic service set network, the infrastructure basic service set network also comprising a first wireless station and an access point, the wireless stations of the infrastructure basic service set network communicating on an infrastructure frequency channel, the method comprising:

determining that a number of consecutive frames received at the second wireless station have a same source address and exceed a threshold value;

a with the first wireless station on a direct link frequency channel that is different than the infrastructure frequency channel based on the determination; and

receiving the data from the first wireless station via the direct link.

9. The computer-readable medium of claim 8, wherein the method further comprises:

determining that the source address is in the infrastructure basic service set network.

10. In a first wireless station that is part of an infrastructure basic service set network, the infrastructure basic service set network also comprising an access point and a second wireless station, the wireless stations of the infrastructure basic service set network communicating on an infrastructure frequency channel, a method comprising:

determining that a number of consecutive frames generated at the first wireless station have a same destination address and exceed a threshold value;

a with the second wireless station on a direct link frequency channel that is different than the infrastructure frequency channel based on the determination; and

transmitting the data to the second wireless station via the direct link.

11. The method of claim 10, wherein after the data has been transmitted to the second wireless station the method further comprises:

terminating the direct link; and

rejoining the infrastructure basic service set network.

12. The method of claim 10, wherein while the direct link is established between the first wireless station and the second wireless station the method further comprises periodically tuning to the infrastructure frequency channel to receive beacons from the access point.

13. The method of claim 12, further comprising:

receiving a beacon that comprises a notification about downlink data for the first wireless station that is buffered at the access point;

determining whether a condition is satisfied for terminating the direct link;

if the condition is satisfied, terminating the direct link and rejoining the infrastructure basic service set network; and

if the condition is not satisfied, tuning to the infrastructure frequency channel at scheduled time intervals to receive the downlink data from the access point.

14. The method of claim 12, further comprising:

periodically tuning to the infrastructure frequency channel to receive every nth beacon; and

if the first wireless station does not see any buffered downlink data advertised in the beacons, increasing the value of n.

15. The method of claim 10, further comprising:

obtaining unused frequency channels information about unused frequency channels near the first wireless station;

sending the unused frequency channels information to the access point; and

receiving the direct link frequency channel from the access point.

16. The method of claim 10, wherein the method further comprises:

determining that the destination address is in the infrastructure basic service set network.

17. In a second wireless station that is part of an infrastructure basic service set network, the infrastructure basic service set network also comprising a first wireless station and an access point, the wireless stations of the infrastructure basic service set network communicating on an infrastructure frequency channel, a method comprising:

determining that a number of consecutive frames received at the second wireless station have a same source address and exceed a threshold value;

a with the first wireless station on a direct link frequency channel that is different than the infrastructure frequency channel based on the determination; and

receiving the data from the first wireless station via the direct link.

18. The method of claim 17, wherein the method further comprises:

determining that the source address is in the infrastructure basic service set network.

19. A first wireless station that is configured to be part of an infrastructure basic service set network, the infrastructure basic service set network also comprising an access point and a second wireless station, the wireless stations of the infrastructure basic service set network communicating on an infrastructure frequency channel, the first wireless station comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to implement a method comprising;

determining that a number of consecutive frames generated at the first wireless station have a same destination address and exceed a threshold value;

a with the second wireless station on a direct link frequency channel that is different than the infrastructure frequency channel based on the determination; and

transmitting the data to the second wireless station via the direct link.

20. The first wireless station of claim 19, wherein after the data has been transmitted to the second wireless station the method further comprises:

terminating the direct link; and

rejoining the infrastructure basic service set network.

21. The first wireless station of claim 19, wherein while the direct link is established between the first wireless station and the second wireless station the method further comprises periodically tuning to the infrastructure frequency channel to receive beacons from the access point.

22. The first wireless station of claim 21, wherein the method further comprises:

receiving a beacon that comprises a notification about downlink data for the first wireless station that is buffered at the access point;

determining whether a condition is satisfied for terminating the direct link;

if the condition is satisfied, terminating the direct link and rejoining the infrastructure basic service set network; and

if the condition is not satisfied, tuning to the infrastructure frequency channel at scheduled time intervals to receive the downlink data from the access point.

23. The first wireless station of claim 21, wherein the method further comprises:

periodically tuning to the infrastructure frequency channel to receive every nth beacon; and

if the first wireless station does not see any buffered downlink data advertised in the beacons, increasing the value of n.

24. The first wireless station of claim 19, wherein the method further comprises:

obtaining unused frequency channels information about unused frequency channels near the first wireless station;

sending the unused frequency channels information to the access point; and

receiving the direct link frequency channel from the access point.

25. The first wireless station of claim 19, wherein the method further comprises:

determining that the destination address is in the infrastructure basic service set network.

26. A second wireless station that is configured to be part of an infrastructure basic service set network, the infrastructure basic service set network also comprising a first wireless station and an access point, the wireless stations of the infrastructure basic service set network communicating on an infrastructure frequency channel, the second wireless station comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to implement a method comprising;

determining that a number of consecutive frames received at the second wireless station have a same source address and exceed a threshold value;

a with the first wireless station on a direct link frequency channel that is different than the infrastructure frequency channel based on the determination; and

receiving the data from the first wireless station via the direct link.

27. The second wireless station of claim 26, wherein the method further comprises:

determining that the source address is in the infrastructure basic service set network.