Monitoring for radio frequency activity violations in a licensed frequency band

• US 7,620,396 B2
• Filed: 02/02/2006
• Issued: 11/17/2009
• Est. Priority Date: 02/08/2005
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Floam, D. Andrew, Sugar, Gary L., Diener, Neil R.
• Primary Examiner(s): D AGOSTA, STEPHEN M
• Application Number:
  US11/345,391
• Publication Number:
  US 20060178145A1
• Time in Patent Office: 1,384 Days
• Field of Search: 455/63.1, 455/67.13, 455/67.14, 455/418, 455/422.1, 455/434, 455/446, 455/501, 455/515
• US Class Current: 455/434
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

Techniques for monitoring radio frequency (RF) activity in a frequency band where licensed spectrum service is occurring. One or more monitoring devices are deployed at one or more locations in the coverage area of a licensed spectrum service provider. For example, the monitoring device may be integrated into a base station of a licensed spectrum service provider. Each monitoring device receives RF energy and detects whether the radio frequency energy contains activity not associated with the licensed spectrum service provider and whether there is a violation of a secondary usage policy.

Claims

1. A method comprising:

at a receiver device, receiving radio frequency (RF) energy at a location in a coverage area of a licensed service provider;

at a computing device;

detecting whether received RF energy includes activity not associated with the licensed service provider in a frequency band; and

measuring an impact on the licensed service provider for activity determined not to be associated with the licensed service provider, wherein measuring comprises determining whether the activity not associated with the licensed service provider is a signal from an unlicensed device that is occurring at substantially the same time as a signal associated with service of the licensed service provider in violation of a secondary usage policy.

2. The method of claim 1, and further comprising capturing and storing data representing detected RF energy that impacts the licensed service provider in the coverage area.

3. The method of claim 1, and further comprising generating a report containing data derived from said measuring and sending the report to the licensed service provider and/or to a spectrum regulation authority.

4. The method of claim 1, wherein receiving, detecting and measuring are performed in a monitoring receiver device that is coupled to an antenna of a base station associated with the licensed service provider.

5. The method of claim 1, wherein measuring comprises determining whether the activity not associated with the licensed service provider exceeds a threshold.

6. The method of claim 1, wherein detecting comprises analyzing one or more of:

average power, duty cycle and/or maximum power of energy in a particular sub-band; and

bandwidth, duration, center frequency and/or power level of pulses of energy detected.

7. The method of claim 1, wherein detecting comprises analyzing the received energy to classify a signal contained in said energy.

8. The method of claim 1, wherein receiving comprises receiving RF energy at a plurality of different locations in the coverage area of the licensed service provider.

9. An apparatus comprising:

a radio receiver that is configured to receive radio frequency (RF) energy;

a spectrum monitoring unit coupled to the radio receiver that is configured to analyze energy received by said radio receiver to produce data representing time domain and frequency domain characteristics associated with received energy; and

a processor connected to said spectrum monitoring unit that analyzes the data produced by said spectrum monitoring unit to determine whether the received energy includes activity not associated with a licensed service provider in a frequency band, wherein the processor is configured to measure an impact on the licensed service provider for activity determined to be associated with the licensed service provider and to determine whether the activity not associated with the licensed service provider is a signal from an unlicensed device that is occurring at substantially the same time as a signal associated with service of the licensed service provider in violation of a secondary usage policy.

10. The apparatus of claim 9, wherein the processor is configured to capture and store in a memory data represented detected energy that impacts the licensed service provider in the coverage area.

11. The apparatus of claim 9, wherein the processor is configured to determine whether the activity not associated with the licensed service provider exceeds a threshold.

12. The apparatus of claim 9, wherein said spectrum monitoring unit is configured to produce said data that includes one or more of:

average power, duty cycle and/or maximum power of energy in a particular frequency sub-band; and

bandwidth, duration, center frequency and/or power level of pulses of energy detected.

13. The apparatus of claim 9, wherein said processor is configured to analyze the data produced by said spectrum monitoring unit to classify a signal contained in said energy.

14. The apparatus of claim 9, wherein said processor is configured to generate a report containing data derived from the captured data and to send the report to the licensed service provider and/or to a spectrum regulation authority.

15. A processor readable medium storing instructions, that when executed by a processor, cause the processor to:

analyze data representing received RF energy at a location in a coverage area of a licensed service provider to determine whether the received RF energy includes activity not associated with the licensed service provider;

measure an impact on the licensed service provider for activity determined not to be associated with the license service provider to determine whether the activity not associated with the licensed service provider is a signal from an unlicensed device that is occurring at substantially the same time as a signal associated with service of the licensed service provider in violation of a secondary usage policy.

16. The processor readable medium of claim 15, and further comprising instructions that, when executed by the processor, cause the processor to generate a report containing data derived the measured impact on the licensed service provider, and to send a report to the licensed service provider and/or to a spectrum regulation authority.

17. The processor readable medium of claim 15, wherein the instructions that cause the processor to measure comprise instructions that cause the processor to determine whether the activity not associated with the licensed service provider exceeds a threshold.

18. The processor readable medium of claim 15, wherein the instructions that cause the processor to analyze and measure are performed with respect to data for received RF energy at a plurality of different locations in the coverage area of the licensed service provider.