TRANSMISSION POWER CONTROL METHOD AND DEVICE FOR COGNITIVE RADIO DEVICE

• US 20120100883A1
• Filed: 04/29/2010
• Published: 04/26/2012
• Est. Priority Date: 04/29/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Hwang, Sung-Hyun, Ko, Gwangzeen, Kim, Chang-Joo, Song, Myung-Sun, Choi, Min-Sheo, Um, Jung-Sun
• Granted Patent: US 9,215,661 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/04 TPC

Abstract

A method and an apparatus for controlling transmit power of a CR device are provided. The method includes acquiring CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device; determining a transmit power value of the CR device using the CR environment information; and generating transmit power control information including the transmit power value. The method and apparatus guarantee reliable communication of the CR device and minimize interference with the licensed user.

Claims

1. A method for controlling transmit power of a Cognitive Radio (CR) device, comprising:

acquiring CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device;

determining a transmit power value of the CR device using the CR environment information; and

generating transmit power control information comprising the transmit power value.

2. The method of claim 1, wherein the CR environment information is acquired by at least one of a geolocation function, a database function, a spectrum sensing function, and a cognition pilot channel function.

3. The method of claim 1, wherein the CR environment information comprises at least one of user existence/nonexistence information, user type information, user number information, and user frequency position information.

4. The method of claim 1, wherein said determining a transmit power value of the CR device using the CR environment information comprises:

decreasing the transmit power value when a licensed user or an unlicensed user occupies the adjacent channel or the adjacent cell.

5. The method of claim 1, wherein said determining a transmit power value of the CR device using the CR environment information comprises:

determining the transmit power value, when a licensed user occupies the adjacent channel or the adjacent cell, to be smaller than or equal to a value when an unlicensed user occupies the adjacent channel or the adjacent cell.

6. The method of claim 1, further comprising:

adjusting transmit power of the CR device using the transmit power control information.

7. An apparatus for controlling transmit power of a CR device, comprising:

an information acquisition unit configured to acquire CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device;

a power determination unit configured to determine a transmit power value of the CR device using the CR environment information; and

an information generation unit configured to generate transmit power control information comprising the transmit power value.

8. A method for controlling transmit power of a CR device, comprising:

acquiring at least one of CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device, transmission scheme information regarding the CR device, and signal quality information regarding the CR device;

determining a transmit power value of the CR device using at least one of the CR environment information, the transmission scheme information, and the signal quality information; and

generating transmit power control information comprising the transmit power value.

9. The method of claim 8, wherein the CR environment information is acquired by at least one of a geolocation function, a database function, a spectrum sensing function, and a cognition pilot channel function.

10. The method of claim 8, wherein the CR environment information comprises at least one of user existence/nonexistence information, user type information, user number information, and user frequency position information.

11. The method of claim 8, wherein the transmission scheme information comprises at least one of modulation scheme information regarding the CR device and coding scheme information regarding the CR device.

12. The method of claim 8, wherein said determining a transmit power value of the CR device using at least one of the CR environment information, the transmission scheme information, and the signal quality information comprises:

decreasing the transmit power value when a licensed user or an unlicensed user occupies the adjacent channel or the adjacent cell.

13. The method of claim 8, wherein said determining a transmit power value of the CR device using at least one of the CR environment information, the transmission scheme information, and the signal quality information comprises:

determining the transmit power value, when a licensed user occupies the adjacent channel or the adjacent cell, to be smaller than or equal to a value when an unlicensed user occupies the adjacent channel or the adjacent cell.

14. The method of claim 8, wherein said determining a transmit power value of the CR device using at least one of the CR environment information, the transmission scheme information, and the signal quality information comprises:

determining the transmit power value, when the CR device uses a high-order modulation scheme, to be larger than a value when the CR device uses a low-order modulation scheme.

15. The method of claim 8, further comprising:

adjusting transmit power of the CR device using the transmit power control information.

16. An apparatus for controlling transmit power of a CR device, comprising:

an information acquisition unit configured to acquire at least one of CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device, transmission scheme information regarding the CR device, and signal quality information regarding the CR device;

a power determination unit configured to determine a transmit power value of the CR device using at least one of the CR environment information, the transmission scheme information, and the signal quality information; and

an information generation unit configured to generate transmit power control information comprising the transmit power value.