| 摘要 |
PROBLEM TO BE SOLVED: To enable a secondary user unauthorized in using spectra to find a primary system spectrum utilization situation in a cognitive radio system.SOLUTION: An electronic device includes a circuit, and the circuit receives a radio telecommunication signal from another device 102. The circuit estimates the energy value of the received radio telecommunication signal, determines whether prescribed relation is satisfied between the estimated energy value and a first threshold value set on the basis of first maximum emission power in a first transmission scheme, uplink transmission, and second emission power in a second transmission scheme, downlink transmission, identifies a characteristic capable of reflecting difference between the first transmission scheme and the second transmission scheme 104, and determines whether the radio telecommunication signal is used for the first transmission scheme or the second transmission scheme according to the characteristic 106.SELECTED DRAWING: Figure 1 |
