Method and apparatus for spectrum sharing between an incumbent communications system and a cognitive radio system

• US 7,881,726 B2
• Filed: 07/31/2007
• Issued: 02/01/2011
• Est. Priority Date: 07/31/2007
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Rao, Yadunandana N., Chaudhri, Apoorv, Gurney, David P., Simms, Matthew E.
• Primary Examiner(s): TRINH, TAN H
• Application Number:
  US11/831,601
• Publication Number:
  US 20090034508A1
• Time in Patent Office: 1,281 Days
• Field of Search: 455/501, 455/454, 455/412.1, 455/414.1, 455/177.1, 455/186.1, 455/509, 455/62, 455/450, 455/414.2, 455/420, 370/351, 370/278, 370/280, 370/281, 370/462, 370/454, 370/338, 375/240.03, 375/260, 375/132, 375/224, 709/224, 386/83, 725/87
• US Class Current: 455/454
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition

Abstract

Efficient frequency spectrum sharing between at least one incumbent communication system(s) (102, 152) and at least one cognitive radio (CR) system (105) is provided. The incumbent system'"'"'s system parameters and CR system'"'"'s operational requirements are copied to a mirrored database (106B). The mirrored database (106B) is controlled by a either a central authority (108) or a database manager having delegated authority (508). The mirrored database (106B) is accessed by the CR system (105). The mirrored database (106B) can be modified and updated by the central authority (108) or delegated database manager (508) to correct for interference detected in the incumbent system caused (152) by the cognitive radio system (105). The cognitive radio system (105) utilizes the updated mirrored database (106B) to avoid interfering with the incumbent system (102, 152) to determine CR system operating parameters thus enhancing the ability to share spectrum.

Claims

1. A spectrum sharing communication network, comprising:

an incumbent communication system;

a cognitive radio (CR) communication system with geo-location information;

a reference database containing at least incumbent system geo-location information;

a mirrored database having a copy of at least a portion of the reference database; and

a database manager maintaining and updating the mirrored database, the CR communication system utilizing the CR system geo-location information to access the updated mirrored database to obtain CR system operating parameters to share spectrum with the incumbent communication system without interference, wherein the database manager comprises a delegated authority and wherein the delegated authority is designated by a central authority.

2. The spectrum sharing communication network of claim 1, wherein the reference database comprises incumbent system parameters of the incumbent communication system.

3. The spectrum sharing communication network of claim 1, wherein the reference database comprises incumbent system parameters of the incumbent communication system and CR operating requirements.

4. The spectrum sharing communication network of claim 1, wherein the mirrored database comprises CR operating requirements and incumbent system parameters.

5. The spectrum sharing communication network of claim 4, wherein the incumbent system parameters comprise one or more of:

a transmitter power level, a transmitter antenna pattern, a transmitter antenna height, a transmitter protected service contour.

6. The spectrum sharing communication network of claim 1, wherein the cognitive radio communication system comprises a public safety communication system.

7. The spectrum sharing communication network of claim 1, wherein the central authority comprises a designated management body.

8. The method of claim 1, wherein the database manager maintains a service priority associated with the incumbent communication system and the CR communication system, and the service priority is utilized to determine a priority for spectrum sharing.

9. The method of claim 1, wherein the database manager computes CR system operating parameters based on the incumbent system geo-location information contained in the mirrored database and the CR system geo-location information.

10. A spectrum sharing communication network, comprising:

an incumbent communication system;

a cognitive radio (CR) communication system;

a reference database;

a mirrored database having a copy of at least a portion of the reference database; and

a database manager maintaining and updating the mirrored database, the CR communication system utilizing the updated mirrored database to share spectrum with the incumbent communication system, wherein the incumbent communication system comprises a public safety communication system, and wherein the database manager updates the mirrored database to provide priority access to the public safety system during a time of emergency.

11. A spectrum sharing communication network, comprising:

an incumbent communication system;

a cognitive radio (CR) communication system;

a reference database;

a mirrored database having a copy of at least a portion of the reference database; and

a database manager maintaining and updating the mirrored database, the CR communication system utilizing the updated mirrored database to share spectrum with the incumbent communication system, wherein the cognitive radio communication system comprises a public safety communication system, and wherein the database manager updates the mirrored database to provide priority access to the public safety system during a time of emergency.

12. A spectrum sharing communication network, comprising:

an incumbent communication system;

a cognitive radio (CR) communication system;

a reference database;

a mirrored database having a copy of at least a portion of the reference database; and

a database manager maintaining and updating the mirrored database, the CR communication system utilizing the updated mirrored database to share spectrum with the incumbent communication system, wherein the database manager updates the mirrored database to reserve spectrum for public safety users.

13. A spectrum sharing communication network, comprising:

an incumbent communication system;

a cognitive radio (CR) communication system;

a reference database;

a mirrored database having a copy of at least a portion of the reference database; and

a database manager maintaining and updating the mirrored database, the CR communication system utilizing the updated mirrored database to share spectrum with the incumbent communication system, wherein the mirrored database reserves spectrum for temporary usage by predetermined high priority users.