Method for dynamic frequency selection and system supporting the same in a cognitive radio wireless communication system

• US 20070117517A1
• Filed: 11/06/2006
• Published: 05/24/2007
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: INHA Industry Partnership Institute, Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: INHA Industry Partnership Institute, Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Yoo, Sang-Jo, Kim, Jae-Myeong, Cho, Kyoung-Jin, Hwang, Duck-Dong, Chung, Jae-Hak, Hui, Junhong
• Granted Patent: US 8,055,213 B2
• Time in Patent Office: Days
• US Class Current: 455/67.110
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Dynamic frequency selection based on CR is provided. A CR BS detects an interference-free and unused frequency band. When sensing a new BS that has great signal strength and requires the frequency band during communications in the frequency band, the CR BS releases the frequency band and dynamically selects another frequency band to avoid interference.

Claims

1. A method of dynamically selecting a frequency band for use in a Customer Premise Equipment (CPE) in a Cognitive Radio (CR) wireless communication system, comprising the steps of:

monitoring reception of a signal from a neighboring primary Base Station (BS) in a current frequency band now in use; and

sending a sensing report message including information about the current frequency band to a CR BS, upon receipt of the signal from the primary BS.

2. The method of claim 1, further comprising:

receiving a band monitoring request message from the CR BS;

monitoring reception of a signal from the primary BS in frequency bands indicated by the band monitoring request message; and

sending a sensing report message including a result of the monitoring to the CR BS.

3. The method of claim 1, further comprising:

receiving a band move message broadcast from the CR BS, when receiving a signal from the primary BS in the current frequency band;

monitoring reception of a signal from the primary BS in a new frequency band indicated by the band move message;

sending a sensing report message reporting that the CPE will move to the new frequency band, if the signal from the primary BS is not received in the frequency band; and

moving from the current frequency band to the new frequency band.

4. The method of claim 3, further comprising:

searching for an available frequency band, upon receipt of a signal from the primary BS in the new frequency band indicated by the band move message;

sending a band move message including information about the detected frequency band to the CR BS;

receiving a band move acknowledgement (ACK) message from the CR BS in response to the band move message; and

moving from the current frequency band to the detected frequency band.

5. The method of claim 4, wherein the search step comprises:

searching for an available frequency band among frequency bands listed in a current frequency band list broadcast in each frame from the CR BS; and

searching for an available frequency band among frequency bands listed in a candidate frequency band list broadcast intermittently from the CR BS, if no available frequency bands are detected in the current frequency band list.

6. A method of dynamically selecting a frequency band for use in a Base Station (BS) in a Cognitive Radio (CR) wireless communication system, comprising the steps of:

sending a band move message including information about an available frequency band to a Customer Premise Equipment (CPE), when determining from a sensing report message received from the CPE that a current frequency band needs to be changed; and

changing the current frequency band to an available frequency band, upon receipt of a sensing report message in response to the band move message from the CPE.

7. The method of claim 6, further comprising:

receiving a band move message from the CPE; and

sending a band move acknowledgement (ACK) message to the CPE, the band move ACK message acknowledging movement to a new frequency band indicated by the band move message.

8. The method of claim 7, wherein the new frequency band indicated by the band move message sent by the CPE is determined from frequency bands listed in a current band list broadcast in each frame and frequency bands listed in a candidate band list broadcast intermittently.

9. A Cognitive Radio (CR) wireless communication system for dynamically selecting a frequency band for use in a CR scheme, comprising:

a Customer Premise Equipment (CPE) for monitoring reception of a signal from a neighboring primary Base Station (BS) in a current frequency band now in use, and requesting changing the current frequency band, upon receipt of the signal from the primary BS; and

a CR BS for selecting an available frequency band upon receipt of the request of changing the current frequency band from the CPE, and notifying the CPE of the selected frequency band.

10. The CR wireless communication system of claim 9, wherein the CR BS notifies the CPE of a frequency band to be monitored to determine whether the primary BS uses the frequency band by a band monitoring request message.

11. The CR wireless communication system of claim 10, wherein the CPE receives the band monitoring request message from the CR BS, monitors reception of a signal from the primary BS in the frequency band indicated by the band monitoring request message, and reports a result of the monitoring to the CR BS.

12. The CR wireless communication system of claim 9, wherein the CR BS sends information about the selected frequency band to the CPE, and changes the current frequency band to the selected frequency band, upon receipt of a report indicating that the selected frequency band is available from the CPE.

13. The CR wireless communication system of claim 12, wherein the CPE receives the information about the selected frequency band from the CR BS, reports to the CR BS that the selected frequency band is available, if the CPE does not receive a signal from the primary BS in the selected frequency band, and changes the current frequency band to the selected frequency band.

14. The CR wireless communication system of claim 13, wherein the CR BS broadcasts a current band list in each frame and a candidate band list intermittently.

15. The CR wireless communication system of claim 14, wherein the CPE receives the current band list and the candidate band list, requests movement to an available frequency band in the current frequency band list to the CR BS, if the selected frequency band is in use for the primary BS, and changes from the current frequency band to the available frequency band, if the CR BS allows the movement to the available frequency band.

16. The CR wireless communication system of claim 15, wherein the CPE requests movement to an available frequency band in the candidate frequency band list to the CR BS, if there is no available frequency band in the current band list, and changes from the current frequency band to the available frequency band, if the CR BS allows the movement to the available frequency band.