Communication initialization method at medium access control layer in a cognitive radio wireless communication system

• US 20070104140A1
• Filed: 11/03/2006
• Published: 05/10/2007
• Est. Priority Date: 11/05/2005
• Status: Active Grant

• Current Assignee: INHA Industry Partnership Institute, Samsung Electronics Co. Ltd.
• Original Assignee: INHA Industry Partnership Institute, Samsung Electronics Co. Ltd.
• Inventors: Kim, Jae-Myeong, Hwang, Duck-Dong, Ashish, Pandharipande, Chung, Jae-Hak, Yoo, Sang-Jo, Seo, Chang-Gun
• Granted Patent: US 8,005,480 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning

Abstract

A communication initialization method at a MAC layer in a CR wireless communication system is provided. The use or non-use of a frequency band is sensed over a broadband with a minimized sensing time in a non-interfering manner with existing communication systems.

Claims

1. A communication initialization method in a Cognitive Radio (CR) communication system having a service area overlapped with the service area of at least one licensed communication system which provides communication service in a licensed frequency band, comprising the steps of:

sensing all available frequency bands for providing communication service from a Base Station (BS);

detecting unused frequency bands that are not used for a licensed communication system or other CR communication systems; and

preparing for providing the communication service to Customer Premise Equipments (CPEs) in the unused frequency bands.

2. The communication initialization method of claim 1, wherein the preparing step comprises:

sending a first ready-to-use (RTU) signal in the unused frequency bands;

receiving channel report signals from the CPEs in response to the first RTU signal; and

selecting a channel for providing the communication service according to the channel report signals.

3. The communication initialization method of claim 2, wherein the first RTU signal includes a Base Station Identification (BSID), a Training Frequency Set (TFS), and a Training Sequence Signal (TFS).

4. The communication initialization method of claim 3, wherein each of the channel report signals includes an ID of a CPE, a Current Band Channel Metric (CBCM) indicating the channel status of each of the frequency bands in which the first RTU signal was sent from the BS, and a Not Available Training Frequency Set (NA-TFS).

5. The communication initialization method of claim 4, wherein the preparing step further comprises:

sending a second RTU signal in frequency bands except for frequency bands used for the licensed communication systems or the other CR communication systems, and the selected channel;

receiving channel report signals from the CPEs in response to the second RTU signal; and

selecting a channel for providing the communication service according to the channel report signals.

6. The communication initialization method of claim 5, wherein the second RTU signal includes a BSID, a Current Band List (CBL), a TFS, and a TFS.