| 摘要 |
The second radio communication system selects one or more of the sub-carriers S21 to be used in accordance with a condition of the sub-carriers S11. The second radio communication system transmits a radio signal by using the sub-carriers S21 selected. In the selection of sub-carrier, the sub-carrier S21 located between the plurality of sub-carriers S11 radiated in the frequency band BW2.
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