Analyzing a particular wireless signal based on characteristics of other wireless signals

Patent metadata

Field	Value
Publication number	US-9319156-B2
Application number	US-201314097198-A
Country	US
Kind code	B2
Filing date	Dec 4, 2013
Priority date	Dec 4, 2013
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

The present disclosure discloses a system and method for classifying Wi-Fi signals from Fourier transform samples. Generally, classifying Wi-Fi signals from Fourier transform samples includes: collecting and dividing Fourier transform samples into frequency blocks; determining the bandwidth for the Fourier transform sample; and determining whether the Fourier transform sample corresponds to a narrowband signal. Further, if a determination is made that the Fourier transform sample does not correspond to a narrowband signal, channel utilization is calculated based on a determination that the FFT sample corresponds to a Wi-Fi signal. If it is determined that the Fourier transform sample corresponds to a narrowband signal, then a determination is made that the FFT sample corresponds to a Wi-Fi signal based on certain criteria. The certain criteria may include one or more of a slope value, a number of sub-peak bins, an analysis of adjacent channels, characteristic matching, or other criteria.

First claim

What is claimed is:

1. A non-transitory computer readable medium comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising:
obtaining samples corresponding to a first wireless signal, wherein the first wireless signal is received in a first time period;
determining a signal strength of the first wireless signal from the samples corresponding to the first wireless signal received in the first time period;
obtaining samples corresponding to a second wireless signal, wherein the second wireless signal is received in a second time period different than the first time period;
determining a signal strength of the second wireless signal from the samples corresponding to the second wireless signal received in the second time period;
responsive to determining that a difference between the signal strengths of the first and second wireless signals is greater than a threshold, determining that the first wireless signal is transmitted from a first source and that the second wireless signal is transmitted from a second source different from the first source;
obtaining samples corresponding to a third wireless signal received in a third time period;
determining a signal strength of the third wireless signal from the samples corresponding to the third wireless signal received in the third time period;
determining a difference between the signal strengths of the first and third wireless signals is less than the threshold; and
estimating that a duration of a wireless signal burst from the first source is longer than the first time period.

2. The computer readable medium of claim 1 , wherein the wireless signal burst is estimated to exceed the first and second time periods.

3. The computer readable medium of claim 1 , further comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising:
determining that the first wireless signal is a Wi-Fi signal based on the samples for the first wireless signal; and
determining that the second wireless signal is a different type of signal than the first wireless signal based on the samples for the second wireless signal.

4. The computer readable medium of claim 1 , further comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising:
determining that a characteristic associated with the first wireless signal matches that of the third wireless signal, wherein the third wireless signal was previously classified as a Wi-Fi signal; and
classifying the first wireless signal as a Wi-Fi signal based on the determination that the characteristic associated with the first wireless signal matches that of the third wireless signal.

5. A computer-implemented method, comprising:
obtaining samples corresponding to a first wireless signal, wherein the first wireless signal is received in a first time period;
determining a signal strength of the first wireless signal from the samples corresponding to the first wireless signal received in the first time period;
obtaining samples corresponding to a second wireless signal, wherein the second wireless signal is received in a second time period different than the first time period;
determining a signal strength of the second wireless signal from the samples corresponding to the second wireless signal received in the second time period;
responsive to determining that a difference between the signal strengths of the first and second wireless signals is greater than a threshold, determining that the first wireless signal is transmitted from a first source and that the second wireless signal is transmitted from a second source different from the first source;
obtaining samples corresponding to a third wireless signal received in a third time period;
determining a signal strength of the third wireless signal from the samples corresponding to the third wireless signal received in the third time period;
determining a difference between the signal strengths of the first and third wireless signals is less than the threshold; and
estimating that a duration of a wireless signal burst from the first source is longer than the first time period.

6. The method of claim 5 , wherein the wireless signal burst is estimated to exceed the first and second time periods.

7. The method of claim 5 , further comprising:
determining that a characteristic associated with the first wireless signal matches that of the third wireless signal, wherein the third wireless signal was previously classified as a Wi-Fi signal; and
classifying the first wireless signal as a Wi-Fi signal based on the determination that the characteristic associated with the first wireless signal matches that of the third wireless signal.

8. A computing device, comprising:
one or more processors; and
a memory having instructions stored thereon, which when executed by the one or more processors, cause the computing device to perform operations including:
obtaining samples corresponding to a first wireless signal, wherein the first wireless signal is received in a first time period;
obtaining samples corresponding to a second wireless signal, wherein the second wireless signal is received in a second time period different than the first time period;
determining a signal strength of the first wireless signal from the samples corresponding to the first wireless signal received in the first time period;
obtaining samples corresponding to a second wireless signal, wherein the second wireless signal is received in a second time period different than the first time period;
determining a signal strength of the second wireless signal from the samples corresponding to the second wireless signal received in the second time period;
responsive to determining that a difference between the signal strengths of the first and second wireless signals is greater than a threshold, determining that the first wireless signal is transmitted from a first source and that the second wireless signal is transmitted from a second source different from the first source;
obtaining samples corresponding to a third wireless signal received in a third time period;
determining a signal strength of the third wireless signal from the samples corresponding to the third wireless signal received in the third time period;
determining a difference between the signal strengths of the first and third wireless signals is less than the threshold; and
estimating that a duration of a wireless signal burst from the first source is longer than the first time period or the second time period.

9. The computing device of claim 8 , wherein the wireless signal burst is estimated to exceed the first and second time periods.

10. The computing device of claim 8 , further comprising instructions, which when executed by the one or more processors, cause the computing device to perform operations including:
determining that the first or second wireless signal is a Wi-Fi wireless signal based on comparing the duration of the wireless signal burst to a threshold.

11. The computing device of claim 8 , further comprising instructions, which when executed by the one or more processors, cause the computing device to perform operations including:
determining that the first wireless signal is a Wi-Fi signal based on the samples for the first wireless signal; and
determining that the second wireless signal is a different type of signal than the first wireless signal based on the samples for the second wireless signal.

12. The computing device of claim 8 , further comprising instructions, which when executed by the one

Assignees

• Aruba Networks Inc

Inventors

• Ponnuswamy Subbu
• Muniyappa Nethra
• Sirigineni Kiranmaye

Classifications

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04B17/30 Primary

  of propagation channels · CPC title

• H04W16/14 Primary

  Spectrum sharing arrangements {between different networks} · CPC title

• H04W28/04

  Error control · CPC title

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title