Method and apparatus for distributed spectrum sensing for wireless communication
First Claim
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1. A method of providing information which can be used to determine if a wireless channel spectrum is available for unlicensed wireless use, the method comprising:
- performing multiple field strength measurements, over a time period, of a licensed signal in said wireless channel spectrum;
generating a measured field strength value from said multiple field strength measurements of the licensed signal;
generating an indication of a reliability of the measured field strength value, wherein said indication includes one of a variance or a standard deviation generated from the multiple field strength measurements, wherein the indication of the reliability of the measured field strength value is calculated based on;
σ
2=E[{tilde over (F)}2]=E[({circumflex over (F)}−
F)2],wherein {circumflex over (F)} denotes the multiple field strength measurements as measured at a spectrum sensor, F denotes an actual field strength at the spectrum sensor, {tilde over (F)} denotes an estimation error, σ
denotes the standard deviation in the estimation error, and σ
2 denotes the variance in the estimation error; and
transmitting the measured field strength value and said indication of the reliability of the measured field strength value to a control node to facilitate a determination as to whether the wireless channel spectrum is unused licensed wireless channel spectrum that is available for unlicensed wireless use.
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Abstract
Methods and apparatus for determining if a signal of interest, for example, a licensed signal having or exceeding a predetermined field strength, is present in a wireless spectrum and/or which facilitates such a determination are described. The signal of interest maybe, e.g., a television signal or a wireless microphone signal using licensed television spectrum. The predetermined field strength may be specified or by a government regulation or rule.
87 Citations
5 Claims
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1. A method of providing information which can be used to determine if a wireless channel spectrum is available for unlicensed wireless use, the method comprising:
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performing multiple field strength measurements, over a time period, of a licensed signal in said wireless channel spectrum; generating a measured field strength value from said multiple field strength measurements of the licensed signal; generating an indication of a reliability of the measured field strength value, wherein said indication includes one of a variance or a standard deviation generated from the multiple field strength measurements, wherein the indication of the reliability of the measured field strength value is calculated based on;
σ
2=E[{tilde over (F)}2]=E[({circumflex over (F)}−
F)2],wherein {circumflex over (F)} denotes the multiple field strength measurements as measured at a spectrum sensor, F denotes an actual field strength at the spectrum sensor, {tilde over (F)} denotes an estimation error, σ
denotes the standard deviation in the estimation error, and σ
2 denotes the variance in the estimation error; andtransmitting the measured field strength value and said indication of the reliability of the measured field strength value to a control node to facilitate a determination as to whether the wireless channel spectrum is unused licensed wireless channel spectrum that is available for unlicensed wireless use.
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2. An apparatus for providing information which can be used to determine if a wireless channel spectrum is available for unlicensed wireless use, the apparatus comprising:
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a field strength measurement module for performing multiple field strength measurements of a licensed signal; a measured field strength value generation module for generating a measured field strength value from said multiple field strength measurements of the licensed signal; a reliability indicator generation module for generating a reliability indicator value indicating a reliability of the measured field strength value, wherein said reliability indicator generation module generates one of; i) a variance, or ii) a standard deviation from said multiple field strength measurements, wherein the reliability indicator value is calculated based on;
σ
2=E[{tilde over (F)}2]=E[({circumflex over (F)}−
F)2],wherein {circumflex over (F)} denotes the multiple field strength measurements as measured at a spectrum sensor, F denotes an actual field strength at the spectrum sensor, {tilde over (F)} denotes an estimation error, σ
denotes the standard deviation in the estimation error, and σ
2 denotes the variance in the estimation error; anda transmitter for transmitting the generated field strength value and the reliability indicator value to a control node to facilitate a determination as to whether the wireless channel spectrum is unused licensed wireless channel spectrum that is available for unlicensed wireless use. - View Dependent Claims (3)
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4. An apparatus for providing information which can be used to determine if a wireless channel spectrum is available for use, the apparatus comprising:
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field strength measurement means for performing multiple field strength measurements of a licensed signal; means for generating a measured field strength value from said multiple field strength measurements of the licensed signal; means for generating a reliability indicator value indicating a reliability of the measured field strength value, wherein said generating the reliability indicator value generates one of; i) a variance, or ii) a standard deviation from said multiple field strength measurements, wherein the reliability indicator value is calculated based on;
σ
2=E[{tilde over (F)}2]=E[({circumflex over (F)}−
F)2],wherein {circumflex over (F)} denotes the multiple field strength measurements as measured at a spectrum sensor, F denotes an actual field strength at the spectrum sensor, {tilde over (F)} denotes an estimation error, σ
denotes the standard deviation in the estimation error, and σ
2 denotes the variance in the estimation error; andtransmitter means for transmitting the generated field strength value and the reliability indicator value to a control node to facilitate a determination as to whether the wireless channel spectrum is unused licensed wireless channel spectrum that is available for unlicensed wireless use.
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5. A non-transitory computer readable medium embodying computer executable instructions for controlling a device to provide information which can be used to determine if a wireless channel spectrum is available for unlicensed wireless use, the computer executable instructions, when executed by a processor, cause the device to perform operations comprising:
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performing multiple field strength measurements, over a time period, of a licensed signal in said wireless channel spectrum; generating a measured field strength value from said multiple field strength measurements of the licensed signal; generating a reliability indicator value indicating a reliability of the measured field strength value, wherein said generating the reliability indicator value generates one of; i) a variance, or ii) a standard deviation from said multiple field strength measurements, wherein the reliability indicator value is calculated based on;
σ
2=E[{tilde over (F)}2]=E[({circumflex over (F)}−
F)2],wherein {circumflex over (F)} denotes the multiple field strength measurements as measured at a spectrum sensor, F denotes an actual field strength at the spectrum sensor, {tilde over (F)} denotes an estimation error, σ
denotes the standard deviation in the estimation error, and σ
2 denotes the variance in the estimation error; andtransmitting the measured field strength value and the reliability indicator value to a control node to facilitate a determination as to whether the wireless channel spectrum is unused licensed wireless channel spectrum that is available for unlicensed wireless use.
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Specification