Direct wireless client to client communication

• US 7,577,125 B2
• Filed: 07/08/2005
• Issued: 08/18/2009
• Est. Priority Date: 07/08/2005
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Huitema, Christian, Kuehnel, Thomas W., Hassan, Amer A., Abhishek, Abhishek, Ruan, Jiandong, Duong, Francis, Anderson, Noel W.
• Primary Examiner(s): Pérez-Gutiérrez; Rafael
• Assistant Examiner(s): VIANA DI PRISCO, GERMAN
• Application Number:
  US11/177,515
• Publication Number:
  US 20070008922A1
• Time in Patent Office: 1,502 Days
• Field of Search: 370/329
• US Class Current: 370/338
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

A wireless station is connected to a wireless network through an access point and can establish a direct client-to-client connection to a second wireless station. The wireless station can communicate directly with the second wireless station without involving the access point. The wireless station communicates with the wired network and with other wireless stations through the access point. The second wireless station may have an infrastructure connection to the access point or may be independent.

Claims

1. A method for communication in a wireless network, comprising;

establishing an infrastructure channel between a first wireless station and a wireless access point connected to a network;

establishing a direct link channel between the first wireless station and a second wireless station without action by the access point, wherein the infrastructure channel and the direct link channel are in operation concurrently and have a common basic service set and a common basic service set ID;

the first wireless station selecting a channel from the direct link channel and the infrastructure channel in the absence of central control; and

communicating on the selected channel.

2. A method as defined in claim 1, wherein establishing a direct link channel comprises:

sending from the first wireless station to the second wireless station a probe request packet containing capability information of the first wireless station;

receiving from the second wireless station a probe response packet containing capability information of the second wireless station; and

establishing a direct link state based on the received capability information, the direct link state defining the direct link channel between the first and second wireless stations.

3. A method as defined in claim 2, wherein establishing a direct link channel further comprises validating security credentials of the second wireless station.

4. A method as defined in claim 1, wherein communicating comprises transmitting and receiving on the direct link channel and checking at intervals for traffic from the access point.

5. A method as defined in claim 1, wherein selecting a channel comprises performing a throughput test of the direct link channel and the infrastructure channels and transmitting data packets between the first and second wireless stations in accordance with the result of the throughput test.

6. A method as defined in claim 1, further comprising terminating the direct link channel when the direct link channel is inactive for a predetermined time period.

7. A method as defined in claim 1, further comprising transmitting data packets at intervals on the direct link channel to keep the direct link channel active.

8. A method as defined in claim 1, further comprising responding to a direct link discovery request from another wireless station.

9. A method as defined in claim 1, establishing a direct link channel comprises transmitting a discovery request to identify a wireless station having direct link capability.

10. A computer-readable medium encoded with instructions for execution in a wireless network, the instructions when executed, performing a method as defined in claim 1.

11. A wireless station for operation in a wireless network, comprising:

a first component that establishes an infrastructure channel to an access point of the wireless network;

a second component that establishes a direct link channel to a second wireless station without action by the access point, wherein the infrastructure channel and the direct link channel are in operation concurrently and have a common basic service set and a common basic service set ID;

a third component that selects a channel from the direct link channel and the infrastructure channel in the absence of central control; and

a fourth component that communicates on the selected channel.

12. A wireless station as defined in claim 11, wherein the third component comprises a quality of service component to perform a throughput test, wherein data packets are transmitted through the infrastructure channel or through the direct link channel according to the result of the throughput test.

13. A wireless station as defined in claim 11, further comprising a timeout component to terminate the direct link channel when the direct link channel is inactive for a predetermined time.

14. A wireless station as defined in claim 11, further comprising an RF selection component to transmit over the infrastructure channel on a first RF channel and to transmit over the direct link channel on a second RE channel.

15. A wireless station as defined in claim 11, further comprising a security validation component to validate security credentials of the second wireless station.