Method and apparatus for managing communications
First Claim
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1. A method comprising:
- sampling signals with a first device, the signals being from channels in a spectrum including a vacant channel;
identifying channels in the spectrum for which the sampled signal is below a minimum power level of a usable transmitted signal in the spectrum, the identified channels being vacant channels;
ranking the identified channels according to channel ranking rules favoring channels with higher and near equal power signals in adjacent channels;
receiving a ranking of channels for a second device;
choosing a channel over which the first device and the second device are to communicate, wherein choosing comprises;
comparing the ranking of identified channels for the first device with the ranking of channels for the second device; and
choosing a channel that is a highest ranked channel common to both the first device and the second device; and
controlling a signal transmitted from the first device on the chosen channel.
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Abstract
Controlling a signal transmitted from a device in a vacant channel in a spectrum.
48 Citations
19 Claims
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1. A method comprising:
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sampling signals with a first device, the signals being from channels in a spectrum including a vacant channel; identifying channels in the spectrum for which the sampled signal is below a minimum power level of a usable transmitted signal in the spectrum, the identified channels being vacant channels; ranking the identified channels according to channel ranking rules favoring channels with higher and near equal power signals in adjacent channels; receiving a ranking of channels for a second device; choosing a channel over which the first device and the second device are to communicate, wherein choosing comprises; comparing the ranking of identified channels for the first device with the ranking of channels for the second device; and choosing a channel that is a highest ranked channel common to both the first device and the second device; and controlling a signal transmitted from the first device on the chosen channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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receiving signals in a first device, the signals being received from channels in a spectrum; analyzing a received signal at a pilot frequency in each channel in the first device; identifying vacant channels for which the received signal at the pilot frequency has a power that is below a minimum power level of a usable transmitted signal in the spectrum; ranking vacant channels, the channel ranking rules favoring channels with higher and near equal power signals in adjacent channels; receiving a ranking of vacant channels for a second device ranked according to the channel ranking rules; comparing the ranking of vacant channels for the first device with the ranking of channels for the second device; choosing a ranked channel that is a highest ranked channel that is common to both the first device and the second device; transmitting a signal from the first device to the second device over the chosen ranked channel; and adjusting a power of the signal transmitted from the first device relative to a power of a signal in a channel adjacent to the selected vacant channel. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system comprising:
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a transmitter to transmit a signal in a vacant channel in a spectrum with a power adjusted relative to a power of a signal in a channel adjacent to the vacant channel; and a receiver to identify vacant channels in the spectrum and to rank vacant channels in the spectrum according to channel ranking rules, the channel ranking rules favoring channels with higher and near equal power signals in adjacent channels; a device to communicate with the transmitter and the receiver over the vacant channel wherein; the receiver comprises a circuit to measure a power of a pilot tone of a carrier in each channel adjacent to the vacant channel; and the transmitter comprises a circuit to adjust the power of the transmitted signal relative to a power of a lowest power pilot tone in a channel adjacent to the vacant channel; and the vacant channel is a highest ranked channel that is common to the receiver and the device, the device including a ranking of channels. - View Dependent Claims (17, 18, 19)
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Specification