Spatial reuse in directional antenna systems

• US 20090059890A1
• Filed: 04/16/2008
• Published: 03/05/2009
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Li, Guoqing, Cordeiro, Carlos
• Granted Patent: US 8,089,947 B2
• Time in Patent Office: Days
• US Class Current: 370/348
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 28/26 Resource reservation

Abstract

In directional antennas, spatial reuse involves enabling two communications to occur on the same link at the same time. The communications may be in the same or opposite directions. If no link of sufficient bandwidth is available that does not already have an active communication, a link with an active communication of sufficient bandwidth is located. Then an antenna training sequence may be implemented. A check determines whether the antenna training sequence was successful. If there was interference during the antenna training sequence, then the spatial reuse is not permitted. Otherwise, spatial reuse may be permitted.

Claims

1. a method comprising:

determining whether to allow spatial reuse in a directional antenna system upon receipt of a request for a communication between two devices.

2. The method of claim 1 including determining, in response to said request, whether bandwidth exists for a communication in a given time period.

3. The method of claim 2 including providing a primary reservation in response to said request if an available channel has resources available.

4. The method of claim 3 including, if there is no available channel time of sufficient length without communications, finding a channel with sufficient duration with only one active communication.

5. The method of claim 4 including creating a second reservation on a channel with another ongoing communication, where the first and second reservations are time overlapping.

6. The method of claim 5 including performing antenna training on a link after providing the second reservation on the channel.

7. The method of claim 6 including determining whether the training was successful.

8. The method of claim 7 including determining whether the training was successful based at least in part on whether there was interference between devices on the same link.

9. The method of claim 8 including revoking the second reservation if the training was not successful.

10. The method of claim 8 including allowing spatial reuse by two communications on the same channel if training was successful.

11. The method of claim 1 receiving a report of a link quality change and determining whether to continue spatial reuse based on said quality change.

12. A wireless device comprising:

a processor to determine whether to allow spatial reuse upon receipt of a request for a communication between two devices; and

a directional antenna coupled to said processor.

13. The device of claim 12, said processor to determine, in response to said request, whether bandwidth exists for a communication in a given time period.

14. The device of claim 13, said processor to provide a primary reservation in response to said request if an available channel has resources available.

15. The device of claim 14, said processor to find a channel with sufficient duration with only one act of communication if there is no available channel of sufficient length without communications.

16. The device of claim 15, said processor to create a second reservation in a channel with another ongoing communication, where the first and second reservations are time overlapping.

17. The device of claim 16, said processor to antenna train on a link after providing the second reservation on the channel.

18. The device of claim 17, said processor to determine whether the training was successful.

19. The device of claim 18, said processor to determine whether the training was successful based, at least in part, on whether there was interference between devices on the same link.

20. The device of claim 19, said processor to revoke the second reservation if the training was not successful.

21. The device of claim 19, said processor to allow spatial reuse by two communications on the same channel if training was successful.

22. The device of claim 12, said processor to use a report of a link quality change to determine whether to continue spatial reuse.