| 摘要 |
In conditions of low data traffic, such as during the night, when transmitting pilots in a downlink radio transmission zone, sub frames are divided into (1) first sub frames that transmit common pilots over a whole transmission band, and (2) second sub frames that transmit common pilots over a specified narrow band of a whole transmission band, where first sub frames are transmitted at a specified period, and second sub frames are transmitted for period of time except the specified period. |
