METHOD AND APAPRATUS FOR CONTROLLING TRANSMISSION POWER OF COGNITIVE RADIO ENVIRONMENT

• US 20080170539A1
• Filed: 05/30/2007
• Published: 07/17/2008
• Est. Priority Date: 01/11/2007
• Status: Active Grant

• Current Assignee: INHA Industry Partnership Institute, Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Yoo, Sang Jo, HYON, Tae In, Chung, Jae Hak, Kwon, Yang Soo, Kim, Jae Myoung
• Granted Patent: US 7,877,109 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A method and apparatus of controlling a transmission power of a cognitive radio (CR) environment, the method including: sensing an incumbent user that uses a same channel as the CR environment; detecting signal quality information of the sensed incumbent user; calculating, using the detected signal quality information, a maximum transmission power value that corresponds to a maximum transmission power that may be transmitted by a CR base station in the CR environment; and controlling a communication of the CR environment to be performed within the calculated maximum transmission power value.

Claims

1. A method of controlling a transmission power of a cognitive radio (CR) environment, the method comprising:

sensing an incumbent user that uses a same channel as the CR environment;

detecting signal quality information of the sensed incumbent user;

calculating, using the detected signal quality information, a maximum transmission power value that corresponds to a maximum transmission power that may be used by a CR base station in the CR environment; and

controlling a communication of the CR environment to be performed according to the calculated maximum transmission power value.

2. The method as claimed in claim 1, wherein the controlling of the communication comprises:

dividing the CR environment into a first sector that uses a first channel and a second sector that uses a second channel;

controlling the communication of the CR environment to be performed within the calculated maximum transmission power value in the first sector only when the first channel is the same channel used by the incumbent user; and

controlling the communication of the CR environment to be performed within the calculated maximum transmission power value in the second sector only when the second channel is the same channel used by the incumbent user.

3. The method as claimed in claim 1, further comprising:

transmitting the detected signal quality information of the sensed incumbent user by a CR user of the CR environment.

4. The method as claimed in claim 1, wherein the calculating of the maximum transmission power value comprises:

calculating the maximum transmission power value according to an equation;

5. The method as claimed in claim 1, wherein the controlling of the communication comprises:

controlling the communication of the CR environment to be performed within the calculated maximum transmission power value.

6. The method as claimed in claim 1, wherein the signal quality information is a signal-to-noise ratio.

7. The method as claimed in claim 1, wherein the detecting of the signal quality information comprises:

measuring a signal quality of the sensed incumbent user.

8. The method as claimed in claim 1, wherein the controlling of the communication comprises:

ending a communication of a CR user with the CR base station when the CR user does not receive a signal from the CR base station.

9. The method as claimed in claim 1, wherein the controlling of the communication comprises:

attempting to retrieve another channel, different from the same channel used by the incumbent user, for a CR user when the CR user does not receive a signal from the CR base station.

10. An apparatus for controlling a transmission power of a CR environment, the apparatus comprising:

a sensing unit to sense an incumbent user that uses a same channel as the CR environment;

a detection unit to detect signal quality information of the sensed incumbent user;

a calculation unit to calculate, using the detected signal quality information, a maximum transmission power value that corresponds to a maximum transmission power that may be used by a CR base station in the CR environment; and

a control unit to control a communication of the CR environment to be performed according to the calculated maximum transmission power value.

11. The apparatus as claimed in claim 10, wherein the control unit:

divides the CR environment into a first sector that uses a first channel and a second sector that uses a second channel;

controls the communication of the CR environment to be performed within the calculated maximum transmission power value in the first sector only when the first channel is the same channel used by the incumbent user; and

controls the communication of the CR environment to be performed within the calculated maximum transmission power value in the second sector only when the second channel is the same channel used by the incumbent user.

12. The apparatus as claimed in claim 10, wherein the calculation unit calculates the maximum transmission power value according to an equation:

13. The apparatus as claimed in claim 10, wherein the control unit controls the communication of the CR environment to be performed within the calculated maximum transmission power value.

14. The apparatus as claimed in claim 10, wherein the signal quality information is a signal-to-noise ratio.

15. The apparatus as claimed in claim 10, wherein the control unit ends a communication of a CR user with the CR base station when the CR user does not receive a signal from the CR base station.

16. The apparatus as claimed in claim 10, wherein the control unit attempts to retrieve another channel, different from the same channel used by the incumbent user, for a CR user when the CR user does not receive a signal from the CR base station.

17. A CR user that communicates with a CR base station in a CR environment, the CR user comprising:

a sensing unit to sense an incumbent user that uses a same channel as the CR environment;

a detection unit to detect signal quality information of the sensed incumbent user; and

a transmission unit to transmit the detected signal quality information to the CR base station of the CR environment.

18. The CR user as claimed in claim 17, wherein the signal quality information is a signal-to-noise ratio.

19. The CR user as claimed in claim 17, wherein the CR user ends a communication with the CR base station when the CR user does not receive a signal from the CR base station.

20. The CR user as claimed in claim 17, wherein the CR user attempts to retrieve another channel, different from the same channel used by the incumbent user, when the CR user does not receive a signal from the CR base station.

21. The CR user as claimed in claim 17, wherein the CR user is a mobile phone.

22. A CR base station that communications with a CR user in a CR environment, the CR base station comprising:

a receiving unit to receive signal quality information, detected by the CR user, of an incumbent user;

a calculation unit to calculate, using the received signal quality information, a maximum transmission power value that corresponds to a maximum transmission power that may be used by the CR base station; and

a control unit to control a communication of the CR environment to be performed according to the calculated maximum transmission power value.

23. The CR base station as claimed in claim 22, wherein the control unit:

divides the CR environment into a first sector that uses a first channel and a second sector that uses a second channel;

controls the communication of the CR environment to be performed within the calculated maximum transmission power value in the first sector only when the first channel is the same channel used by the incumbent user; and

controls the communication of the CR environment to be performed within the calculated maximum transmission power value in the second sector only when the second channel is the same channel used by the incumbent user.

24. The CR base station as claimed in claim 22, wherein the calculation unit calculates the maximum transmission power value according to an equation:

25. The CR base station as claimed in claim 22, wherein the control unit controls the communication of the CR environment to be performed within the calculated maximum transmission power value.

26. The CR base station as claimed in claim 22, wherein the signal quality information is a signal-to-noise ratio.

27. A method of controlling a transmission power of a CR environment, the method comprising:

sensing an incumbent user that uses a same channel as the CR environment;

calculating a maximum transmission power value that corresponds to a maximum transmission power that may be used by a CR base station in the CR environment without causing an inadmissible interference for the incumbent user; and

controlling a communication of the CR environment to be performed according to the calculated maximum transmission power value.

28. The method as claimed in claim 27, wherein the controlling of the communication comprises:

dividing the CR environment into a first sector that uses a first channel and a second sector that uses a second channel;

controlling the communication of the CR environment to be performed within the calculated maximum transmission power value in the first sector only when the first channel is the same channel used by the incumbent user; and

controlling the communication of the CR environment to be performed within the calculated maximum transmission power value in the second sector only when the second channel is the same channel used by the incumbent user.

29. The method as claimed in claim 27, wherein the controlling of the communication comprises:

attempting to retrieve another channel, different from the same channel used by the incumbent user, for a CR user when the CR user does not receive a signal from the CR base station.

30. A method of determining a transmission power of a CR environment, the method comprising:

obtaining signal quality information of an incumbent user that uses a same channel as the CR environment; and

calculating, using the signal quality information, a maximum transmission power value that corresponds to a maximum transmission power that may be used by a CR base station in the CR environment.

31. The method as claimed in claim 30, wherein the obtaining of the signal quality comprises:

receiving the signal quality of the incumbent user from a CR user of the CR environment.

32. The method as claimed in claim 30, wherein the calculating of the maximum transmission power value comprises:

calculating the maximum transmission power value according to an equation;

33. The method as claimed in claim 30, further comprising:

controlling a communication of the CR environment to be performed within the calculated maximum transmission power value.

34. The method as claimed in claim 30, wherein the signal quality information is a signal-to-noise ratio.