Ntt Docomo, Inc.

Tomoki Sao

Hiroyuki Ishii

Takehiro Nakamura

Akihito Hanaki

Shinya Tanaka

A target base station transmits a traffic assignment signal a plurality of times to a control station for notifying a traffic amount of downlink data that can be processed by the target base station, after a notified cell change timing in which the mobile station changes a communicating base station.

Base station, mobile communication system, and mobile communication control method

A radio communication control system controlling a transmission power of a shared control channel for transmitting a control signal to a plurality of mobile stations. The system includes a transmission power lower limit value setting section configured to set a lower limit value of the transmission power of the shared control channel, and to set the transmission power of the shared control channel at the lower limit value when the transmission power of the shared control channel is lower than the lower limit value.

Radio communication control system, radio base station and radio communication control method

A data flow amount control device in a mobile communication system includes a plurality of mobile stations, a control station relaying packets to each of the plurality of mobile stations, and a base station temporarily storing the packets transmitted from the control station in a buffer and transmitting the packets to each of the plurality of mobile stations. The data flow amount control device includes a radio condition acquisition unit configured to acquire a radio condition of each of the plurality of mobile stations; a packet transmission frequency calculation unit configured to calculate a transmission frequency of the packets transmitted from the base station to each of the plurality of mobile stations; and a packet transmission amount control unit configured to control a transmission amount of the packets transmitted from the control station to the base station.

Data flow amount control device and method

To provide a base station, a control station, and a radio communication control method which can prevent occurrence of breakage of data sending toward a mobile station or data loss at a cell change. An inflow amount controlling functionof a source base stationcontrols the amount of inflow data from a control stationto the source base stationby sending an inflow amount control signal indicating 'inflow amount zero' to the control stationat a timing earlier than a cell change timing Tc by a cell change waiting time tw.

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Yokohama, Japan

Tomoki Sao