Radio terminal
First Claim
1. A radio terminal which carries out data transmission using a plurality of frequency bands including frequency bands licensed to other licensed radio terminals, comprising:
- a detection section configured to detect a radio signal for each frequency band;
a judging section configured to carry out a modulation analysis by sampling the detected radio signal and calculating frequency and time statistical values of the detected radio signal;
to judge, based on a pattern recognition method, whether or not the calculated statistical values match statistical features of a modulation scheme of a licensed radio terminal; and
thereby to judge whether the detected radio signal is a radio signal from a licensed radio terminal or not;
a selection section configured to select frequency bands in which periods that no radio signal from licensed radio terminals are detected are equal to or exceed a first threshold and in which frequency band utilization rates by unlicensed radio terminals are equal to or lower than a second threshold, as a plurality of frequency bands to be used for data transmission based on the judgment result;
a schedule generation section configured to generate a schedule for intermittent data transmissions using the plurality of selected frequency bands by determining a continuous data transmission time in each intermittent data transmission such that the utilization rate falls to or below the second threshold for each of the selected frequency bands;
a data generation section configured to generate data for the intermittent data transmissions;
a data transmission section configured to transmit the generated data according to the schedule;
a carrier sensing section configured to carry out carrier sensing on a frequency band in which data is transmitted before data transmission for each of the intermittent data transmissions; and
a control section configured to stop, when the carrier sensing result shows that a radio signal from a licensed radio terminal is detected in a certain frequency band, data transmission using at least the certain frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided with a radio terminal which carries out data transmission using frequency bands licensed to other licensed radio terminals, including: a judging section configured to carry out a modulation analysis on a radio signal for each frequency band to judge whether the radio signal is a radio signal from a licensed radio terminal or not; a selection section configured to select a plurality of frequency bands; a schedule generation section configured to generate a schedule for intermittent data transmission; a data transmission section configured to transmit data according to the schedule; a carrier sensing section configured to carry out carrier sensing on a frequency band in which data is transmitted before data transmission for each the intermittent data transmission; and a control section configured to stop, when a radio signal from a licensed radio terminal is detected in a certain frequency band, data transmission using at least the certain frequency band.
33 Citations
14 Claims
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1. A radio terminal which carries out data transmission using a plurality of frequency bands including frequency bands licensed to other licensed radio terminals, comprising:
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a detection section configured to detect a radio signal for each frequency band; a judging section configured to carry out a modulation analysis by sampling the detected radio signal and calculating frequency and time statistical values of the detected radio signal;
to judge, based on a pattern recognition method, whether or not the calculated statistical values match statistical features of a modulation scheme of a licensed radio terminal; and
thereby to judge whether the detected radio signal is a radio signal from a licensed radio terminal or not;a selection section configured to select frequency bands in which periods that no radio signal from licensed radio terminals are detected are equal to or exceed a first threshold and in which frequency band utilization rates by unlicensed radio terminals are equal to or lower than a second threshold, as a plurality of frequency bands to be used for data transmission based on the judgment result; a schedule generation section configured to generate a schedule for intermittent data transmissions using the plurality of selected frequency bands by determining a continuous data transmission time in each intermittent data transmission such that the utilization rate falls to or below the second threshold for each of the selected frequency bands; a data generation section configured to generate data for the intermittent data transmissions; a data transmission section configured to transmit the generated data according to the schedule; a carrier sensing section configured to carry out carrier sensing on a frequency band in which data is transmitted before data transmission for each of the intermittent data transmissions; and a control section configured to stop, when the carrier sensing result shows that a radio signal from a licensed radio terminal is detected in a certain frequency band, data transmission using at least the certain frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification