SPATIAL REUSE IN DIRECTIONAL ANTENNA SYSTEMS

• US 20120099582A1
• Filed: 01/02/2012
• Published: 04/26/2012
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Carlos Cordeiro, Guoqing Li
• Original Assignee: Carlos Cordeiro, Guoqing Li
• Inventors: CORDEIRO, Carlos, LI, Guoqing
• Granted Patent: US 8,644,291 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:

identifying that insufficient free time exists in a millimeter wave (mm wave) wireless communications channel for a planned wireless communication, the planned communication between a first device and a second device;

reserving a spatial reuse time in the mm wave communications channel, the spatial reuse time having a portion that overlaps with an existing wireless communication in the mm wave communications channel;

determining whether the planned wireless communication during the spatial reuse time will interfere with the existing communication; and

performing said planned wireless communication during the spatial reuse time when said determining fails to indicate interference with the existing communication.

2. The method of claim 1, including performing antenna training during the spatial reuse time.

3. The method of claim 2, including determining whether the training was successful.

4. The method of claim 3, including determining whether the training was successful based at least in part on whether there was interference in the mm wave communications channel.

5. A method comprising:

determining whether sufficient free time exists in a millimeter wave (mm wave) wireless communications channel for a planned wireless communication, the planned wireless communication between a first device and a second device;

when sufficient free time exists, reserving a time for the planned wireless communication within said sufficient free time; and

when insufficient free time exist, reserving a spatial reuse time in the mm wave communications channel, the spatial reuse time having a portion that overlaps with an existing wireless communication in the mm wave communications channel, and determining whether the planned wireless communication during the spatial reuse time will interfere with the existing communication.

6. The method of claim 5, including performing said planned wireless communication during the spatial reuse time when said determining fails to indicate interference with the existing communication.

7. The method of claim 5, including performing antenna training during the spatial reuse time.

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

9. The method of claim 8, including determining whether the training was successful based at least in part on whether there was interference in the mm wave communications channel.

10. The method of claim 5, wherein said reserving a spatial reuse time comprises providing a secondary reservation.

11. The method of claim 5, including 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 identify that insufficient free time exists in a millimeter wave (mm wave) wireless communications channel for a planned wireless communication, the planned communication between a first device and a second device, said processor to reserve a spatial reuse time in the mm wave communications channel, the spatial reuse time having a portion that overlaps with an existing wireless communication in the mm wave communications channel, and said processor to determine whether the planned wireless communication during the spatial reuse time will interfere with the existing communication; and

a directional antenna coupled to said processor.

13. The device of claim 12, said processor to perform said planned communication during the spatial reuse time.

14. The device of claim 13, said processor to perform said planned communication during the spatial reuse time when said processor fails to determines an indication of interference with the existing communication.

15. The device of claim 12, said processor to antenna train on a link after providing the second reservation on the channel.

16. The device of claim 12, said processor to perform antenna training during the spatial reuse time.

17. The device of claim 16, said processor to determine whether the training was successful.

18. The device of claim 17, said processor to determine whether the training was successful based at least in part on whether there was interference in the mm wave communications channel.