System and method of exploiting location awareness to improve wireless cognitive radio

• US 8,295,859 B1
• Filed: 02/02/2011
• Issued: 10/23/2012
• Est. Priority Date: 01/23/2007
• Status: Active Grant

• Current Assignee: University of South Florida (State University System of Florida)
• Original Assignee: University of South Florida (State University System of Florida)
• Inventors: Yarkan, Serhan, Arslan, Huseyin
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US13/019,689
• Time in Patent Office: 629 Days
• Field of Search: 455/67.1, 455/414.1, 4554561-457, 455 6711- 6716, 455423-425, 342/450
• US Class Current: 455/456.6
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/04 based on user or terminal location or mobility data, e.g. moving direction, speed
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

The present invention provides a system and method for exploiting location awareness to improve the communication performance in a wireless cognitive radio system. The invention includes determining the absolute position information for the cognitive radio system, receiving digital topographical data related to the absolute position information, classifying the environment of the cognitive radio system based on the absolute position and the topographical data, matching the classified environment with corresponding statistical parameters and improving the communication performance of the cognitive radio system by adapting the cognitive radio system according to the corresponding statistical parameters.

Claims

1. A method of exploiting location awareness to improve communication performance in a wireless cognitive radio system, the system having at least one cognitive radio capable of obtaining its location information and at least one cognitive radio incapable of obtaining its own location information and incapable of having its location information determined by the at least one cognitive radio capable of obtaining its location information, the method comprising:

determining absolute position information for the at least one cognitive radio capable of obtaining its location information;

receiving digital topographical data related to the absolute position information;

classifying the environment of the cognitive radio system based on the absolute position and the topographical data;

matching the classified environment with corresponding statistical parameters to identify propagation characteristics of the system;

disseminating the propagation characteristics of the system to the at least one cognitive radio incapable of obtaining its own location information and incapable of having its location information determined by the at least one cognitive radio capable of obtaining its location information; and

improving the communication performance of the cognitive radio system by adapting the at least one cognitive radio capable of obtaining its location information and the at least one cognitive radio incapable of obtaining its own location information and incapable of having its location information determined by the at least one cognitive radio capable of obtaining its location information according to the propagation characteristics.

2. The method of claim 1, wherein determining the absolute position information for the at least one cognitive radio capable of obtaining its location information further comprises determining the absolute position information using a global positioning system technology.

3. The method of claim 1, wherein receiving digital topographical data further comprises receiving digital topographical data using digital elevation models.

4. The method of claim 1, wherein the cognitive radio system is a centralized cognitive radio system and disseminating the propagation characteristics to the at least one cognitive radio incapable of obtaining its own location information in the centralized cognitive radio system further comprises, the at least one cognitive radio incapable of obtaining its own location information requesting the propagation characteristics from a center cognitive radio of the centralized cognitive radio system.

5. The method of claim 4, wherein the center cognitive radio of the centralized cognitive radio system is capable of obtaining its own location information and wherein disseminating the propagation characteristics to the at least one cognitive radio incapable of obtaining its own location information further comprises, the center cognitive radio forwarding the propagation characteristics to the at least one cognitive radio incapable of obtaining its own location information.

6. The method of claim 4, wherein the center cognitive radio of the centralized cognitive radio system is incapable of obtaining its own location information and wherein disseminating the propagation characteristics to the at least one cognitive radio incapable of obtaining its own location information further comprises, the center cognitive radio broadcasting the location information of the at least one cognitive radio incapable of obtaining its own location information to at least one other cognitive radio in the system capable of obtaining its own location information, receiving the propagation characteristics from the at least one other cognitive radio at the center cognitive radio and the center cognitive radio forwarding the propagation characteristics to the at least one cognitive radio incapable of obtaining its own location information.

7. The method of claim 1, wherein the cognitive radio system is a decentralized cognitive radio system and disseminating the propagation characteristics to the at least one cognitive radio incapable of obtaining its own location information in the decentralized cognitive radio system further comprises, the at least one cognitive radio incapable of obtaining its own location information broadcasting it'"'"'s a request for location information and waiting for at least one other cognitive radio capable of obtaining its own location information to respond with the propagation characteristics.

8. The method of claim 1, wherein the environment classification is selected from the group consisting of urban, suburban, rural, hilly terrain, open, street, dense, large, corridor, outdoor, indoor, macrocell, microcell and picocell.

9. The method of claim 1, wherein the statistical parameters are selected from the group consisting of path-loss, delay spread, Doppler spread, angular spread, line-of-sight, non-line-of-sight and noise characteristics.

10. The method of claim 1, wherein disseminating the propagation characteristics of the system to the at least one cognitive radio incapable of obtaining its own location information method further comprises, disseminating the propagation characteristics utilizing an information dissemination protocol.

11. The method of claim 10, wherein the information dissemination protocol is Radio Knowledge Representation Language (RKRL).

12. The method of claim 1, wherein improving the communication performance of the cognitive radio system by adapting the at least one cognitive radio capable of obtaining its location information and the at least one cognitive radio incapable of obtaining its own location information according to the propagation characteristics further comprises, adapting the at least one cognitive radio capable of obtaining its location information and the at least one cognitive radio incapable of obtaining its own location information through empirical models.

13. A system for exploiting location awareness to improve communication performance in a wireless cognitive radio system, the system comprising at least one cognitive radio capable of obtaining its location information having a location sensor to determine the absolute position information for the cognitive radio system capable of obtaining it'"'"'s its location information;

at least one cognitive radio incapable of obtaining its location information and incapable of having its location information determined by the at least one cognitive radio capable of obtaining its location information;

a topographical database to provide digital topographical data related to the absolute position information for the cognitive radio system capable of obtaining its location information;

a cognitive engine to classifying the environment of the cognitive radio system based on the absolute position for the at least one cognitive radio capable of obtaining its location information and the topographical data, and to match the classified environment with corresponding statistical parameters to identify propagation characteristics of the system; and

an information dissemination protocol to disseminate the propagation characteristics of the system to the at least one cognitive radio incapable of obtaining its own location information and incapable of having its location information determined by the at least one cognitive radio capable of obtaining its location information.

14. The system of claim 13, wherein the location sensor is a global positioning system technology sensor.

15. The system of claim 13, wherein the topographical database uses digital elevation models.

16. The system of claim 13, wherein the environment classification is selected from the group consisting of urban, suburban, rural, hilly terrain, open, street, dense, large, corridor, outdoor, indoor, macrocell, microcell and picocell.

17. The system of claim 13, wherein the statistical parameters are selected from the group consisting of path-loss, delay spread, Doppler spread, angular spread, line-of-sight, non-line-of-sight and noise characteristics.

18. The system of claim 13, wherein the at least one cognitive radio incapable of obtaining its own location information is adapted according to the corresponding statistical parameters utilizing empirical models.

19. The method of claim 13, wherein the information dissemination protocol is Radio Knowledge Representation Language (RKRL).