| 摘要 |
When a channel for micro cell is assigned to a mobile station PS1 of a micro cell, one carrier frequency whose reception level is lower than a threshold level is selected from a plurality of up carrier frequencies and down carrier frequencies which a macro cell system holds, an up channel and a down channel for micro cell are set on the selected carrier frequency, the above channels are assigned to the mobile station PS1 of the micro cell to permit radio communication based on the TDD scheme between the mobile station PS1 and a micro cell base station BSb1.
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