| 摘要 |
A base station includes a multicast group administration unit administering a multicast group to which a mobile station belongs, a timing determination unit determining an inter-frequency measurement timing when the mobile station measures a signal having a frequency different from a frequency for a residing cell of the mobile station, and a transmission unit transmitting data. The timing determination unit assigns an uniform inter-frequency measurement timing for at least two mobile stations belonging to the same multicast group. The transmission unit transmits data to a mobile station within the multicast so as to avoid the inter-frequency measurement timing.
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