COGNITIVE RADIO COMMUNICATION APPARATUS AND METHOD WHICH ADAPTABLY CONTROLS SENSING REFERENCE LEVEL

• US 20090170545A1
• Filed: 07/07/2008
• Published: 07/02/2009
• Est. Priority Date: 01/02/2008
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group), Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group), Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Jang, Kyung Hun, Kim, Youngsoo, Hyon, Tae In, Choi, Hyun Ho, Lee, In Sun
• Granted Patent: US 8,086,186 B2
• Time in Patent Office: Days
• US Class Current: 455/513
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal

Abstract

A cognitive radio communication apparatus and method which adaptably controls a sensing reference level based on a transmission power of a transmitter is provided. A cognitive radio communication apparatus includes a sensing reference level control unit to adaptably control a sensing reference level based on a transmission power of a secondary transmitter included in a secondary network, and a fast sensing unit to determine whether a signal received for a predetermined time period exists based on the controlled sensing reference level.

Claims

1. A cognitive radio communication apparatus, comprising:

a sensing reference level control unit to adaptably control a sensing reference level based on a transmission power of a secondary transmitter included in a secondary network; and

a fast sensing unit to determine whether a signal received for a predetermined time period exists based on the controlled sensing reference level.

2. The cognitive radio communication apparatus of claim 1, wherein the sensing reference level control unit predicts an amount of interference which can occur in a primary receiver included in a primary network, and controls the sensing reference level based on the predicted interference amount.

3. The cognitive radio communication apparatus of claim 1, wherein the sensing reference level control unit controls the sensing reference level based on a minimum signal to interference and noise ratio (SINR) required by a primary receiver included in a primary network.

4. The cognitive radio communication apparatus of claim 3, wherein the sensing reference level control unit predicts a minimum possible distance between the secondary transmitter and the primary receiver, and controls the sensing reference level based on the predicted minimum possible distance, the minimum possible distance being a distance where an actual SINR of the primary receiver is identical to the minimum SINR.

5. The cognitive radio communication apparatus of claim 4, wherein the sensing reference level control unit controls the sensing reference level further based on a coverage radius of a primary transmitter included in the primary network.

6. The cognitive radio communication apparatus of claim 1, wherein the sensing reference level control unit controls the reference sensing reference level based on a previously identified power of a signal transmitted from a primary transmitter included in a primary network.

7. The cognitive radio communication apparatus of claim 1, further comprising:

a fine sensing unit to determine, when it is determined that the received signal exists, whether the received signal is transmitted from a primary transmitter included in a primary network according to a fine sensing scheme.

8. The cognitive radio communication apparatus of claim 1, wherein the fast sensing unit determines whether the received signal exists according to a fast sensing scheme which compares the controlled sensing reference level and power of the received signal.

9. The cognitive radio communication apparatus of claim 1, further comprising:

a transmission power determination unit to determine the transmission power of the secondary transmitter based on a distance between the secondary transmitter and secondary receiver included in the secondary network.

10. The cognitive radio communication apparatus of claim 9, wherein the transmission power determination unit increases the transmission power of the secondary transmitter when the distance between the secondary transmitter and secondary receiver increases, and decreases the transmission power of the secondary transmitter when the distance between the secondary transmitter and secondary receiver decreases.

11. A cognitive radio communication method, comprising:

adaptably controlling a sensing reference level based on a transmission power of a secondary transmitter included in a secondary network; and

determining whether a signal received for a predetermined time period exists based on the controlled sensing reference level.

12. The cognitive radio communication method of claim 11, wherein the controlling predicts an amount of interference which can occur in a primary receiver included in a primary network, and controls the sensing reference level based on the predicted interference amount.

13. The cognitive radio communication method of claim 11, wherein the controlling controls the sensing reference level based on a minimum SINR required by a primary receiver included in a primary network.

14. The cognitive radio communication method of claim 13, wherein the controlling predicts a minimum possible distance between the secondary transmitter and the primary receiver, and controls the sensing reference level based on the predicted minimum possible distance, the minimum possible distance being a distance where an actual SINR of the primary receiver is identical to the minimum SINR.

15. The cognitive radio communication method of claim 11, further comprising:

determining, when it is determined that the received signal exists, whether the received signal is transmitted from a primary transmitter included in a primary network according to a fine sensing scheme.

16. The cognitive radio communication method of claim 11, further comprising:

determining the transmission power of the secondary transmitter based on a distance between the secondary transmitter and secondary receiver included in the secondary network.

17. A computer-readable recording medium storing a program for implementing a cognitive radio communication method, comprising:

adaptably controlling a sensing reference level based on a transmission power of a secondary transmitter included in a secondary network; and

determining whether a signal received for a predetermined time period exists based on the controlled sensing reference level.

18. A cognitive radio communication apparatus for a cellular communication system, the cognitive radio communication apparatus comprising:

a sensing reference level control unit to adaptably control a sensing reference level based on a transmission power of a base station or terminal included in a secondary network corresponding to the cellular communication system; and

a fast sensing unit to determine whether a signal received for a predetermined time period exists based on the controlled sensing reference level.

19. The cognitive radio communication apparatus for a cellular communication system of claim 18, wherein the sensing reference level control unit predicts an amount of interference which can occur in a primary receiver included in a primary network, and controls the sensing reference level based on the predicted interference amount.

20. The cognitive radio communication apparatus for a cellular communication system of claim 18, wherein the sensing reference level control unit controls the sensing reference level based on a minimum SINR required by a primary receiver included in a primary network.

21. The cognitive radio communication apparatus for a cellular communication system of claim 20, wherein the sensing reference level control unit predicts a minimum possible distance between the primary receiver and any one of the base station and terminal, and controls the sensing reference level based on the predicted minimum possible distance, the minimum possible distance being a distance where an actual SINR of the primary receiver is identical to the minimum SINR.

22. The cognitive radio communication apparatus for a cellular communication system of claim 21, wherein the sensing reference level control unit controls the sensing reference level further based on a coverage radius of a primary transmitter included in the primary network.

23. The cognitive radio communication apparatus for a cellular communication system of claim 18, wherein the sensing reference level control unit controls the reference sensing reference level based on a previously identified power of a signal transmitted from a primary transmitter included in a primary network.