System and method for allocating spectrum using dynamically adjusted separation distances for mitigating interference
Allocating spectrum to a secondary radio device includes determining a contour separation distance for the secondary radio device. The contour separation distance is a function of a minimum separation distance from protected areas of primary radio devices and an accuracy variance for the secondary radio device. The accuracy variance is specified as a distance and is a function of accuracy information for a reported location of the secondary radio device. If a distance between a contour of a protected area for a primary radio device and the reported location for the secondary radio device is less than the contour separation distance, a channel used by the primary radio device is not available for use by the secondary radio device for wireless communications. Otherwise the channel used by the primary radio device is available for use by the secondary radio device for wireless communications.
1. A method of allocating spectrum to a secondary radio device, comprising:
receiving a reported location of the secondary radio device and accuracy information for the reported location, the secondary radio device having a minimum separation distance from protected areas of primary radio devices;
determining an accuracy variance for the secondary radio device, the accuracy variance specified as a distance and is a function of the accuracy information for the reported location;
determining a contour separation distance for the secondary radio device, the contour separation distance comprising a sum of the minimum separation distance and the accuracy variance; and
if a distance between a contour of a protected area for a primary radio device and the reported location for the secondary radio device is less than the contour separation distance, determining that a channel used by the primary radio device is not available for use by the secondary radio device for wireless communications, otherwise the channel used by the primary radio device is determined to be available for use by the secondary radio device for wireless communications.
2. The method of claim 1 , further comprising, upon determining that the channel used by the primary radio device is available for use by the secondary radio device for wireless communications, transmitting a spectrum allocation to the secondary radio device containing data indicating that the channel used by the primary radio device is available for use by the secondary radio device for wireless communications.
3. The method of claim 2 , wherein the spectrum allocation is a white spaces channel list.
4. The method of claim 1 , wherein the minimum separation distance is set by regulation.
5. The method of claim 1 , wherein the minimum separation distance is determined as a function of at least one of capabilities or configuration of the secondary radio device.
6. The method of claim 1 , wherein the accuracy variance is an accuracy value received from the secondary radio device as part of the accuracy information minus a location accuracy threshold that is used as a factor in establishment of the minimum separation distance.
7. The method of claim 1 , wherein the accuracy variance is determined as a function of a technique used to determine the location of the secondary radio device.
8. The method of claim 1 , wherein the contour separation distance further comprises a confidence factor that is specified as a distance and is added to the sum of the minimum separation distance and accuracy variance.
9. The method of claim 8 , wherein the confidence factor is a function of one or more of a level of confidence in an accuracy value received from the secondary radio device as part of the accuracy information, a setting of the secondary radio device, or a location determination error for the secondary radio device.
10. The method of claim 1 , wherein the contour separation distance further comprises a distance between an installation location of the secondary radio device and a location at which the reported location is determined.
11. A spectrum management server system for allocating spectrum to a secondary radio device, comprising:
a communications interface over which a reported location of the secondary radio device and accuracy information for the reported location is received, the secondary radio device having a minimum separation distance from protected areas of primary radio devices; and
a processor that executes logical instructions to:
determine an accuracy variance for the secondary radio device, the accuracy variance specified as a distance and is a function of the accuracy information for the reported location;
determine a contour separation distance for the secondary radio device, the contour separation distance comprising a sum of the minimum separation distance and the accuracy variance; and
determine that a channel used by a primary radio device is not available for use by the secondary radio device for wireless communications if a distance between a contour of a protected area for the primary radio device and the reported location for the secondary radio device is less than the contour separation distance, otherwise determine that the channel used by the primary radio device is available for use by the secondary radio device for wireless communications.
12. The spectrum management server system of claim 11 , wherein upon determining that the channel used by the primary radio device is available for use by the secondary radio device for wireless communications, the spectrum management server system transmits a spectrum allocation to the secondary radio device containing data indicating that the channel used by the primary radio device is available for use by the secondary radio device for wireless communications.
13. The spectrum management server system of claim 12 , wherein the spectrum allocation is a white spaces channel list.
14. The spectrum management server system of claim 11 , wherein the minimum separation distance is set by regulation.
15. The spectrum management server system of claim 11 , wherein the minimum separation distance is determined as a function of at least one of capabilities or configuration of the secondary radio device.
16. The spectrum management server system of claim 11 , wherein the accuracy variance is an accuracy value received from the secondary radio device as part of the accuracy information minus a location accuracy threshold that is used as a factor in establishment of the minimum separation distance.
17. The spectrum management server system of claim 11 , wherein the accuracy variance is determined as a function of a technique used to determine the location of the secondary radio device.
18. The spectrum management server system of claim 11 , wherein the contour separation distance further comprises a confidence factor that is specified as a distance and is added to the sum of the minimum separation distance and accuracy variance.
19. The spectrum management server system of claim 11 , wherein the confidence factor is a function of one or more of a level of confidence in an accuracy value received from the secondary radio device as part of the accuracy information, a setting of the secondary radio device, or a location determination error for the secondary radio device.
20. The spectrum management server system of claim 11 , wherein the contour separation distance further comprises a distance between an installation location of the secondary radio device and a location at which the reported location is determined.