| 摘要 |
A base station and a mobile unit and method for controlling them can retransmit a request for transition without any useless transmission. The base station receives from the mobile unit a request for transition of the mobile unit to a semi connected state in which the mobile unit comes into a power saving state, while holding a mobile unit identifier assigned for identifying the mobile unit by the base station, and the base station determines the state of the base station in response to the request. The base station transmits to the mobile unit a response to the request together with a reason for disallowance attached to the response when the request for transition is not allowable as a result of the determination of the state of the base station. The mobile unit controls the transmission of the request for transition according to the reason for disallowance.
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