Ntt Docomo, Inc.

Koji Furutani

Hiroyuki Ishii

Akihito Hanaki

Takahiro Hayashi

Yoshikazu Goto

Junichiro Kawamoto

The present invention relates to a mobile communication system which includes a base station, a mobile station for performing a communication with the base station, and a radio network controller for controlling the communication between the base station and the mobile station. The mobile communication system comprises a controller configured to control a communication state of the communication between the base station and the mobile station according to a congestion state of an uplink.

Mobile communication system and communication controlling method

A data flow amount control device in a mobile communication system which includes a plurality of mobile stations, a control station relaying packets addressed 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 comprises a determination unit configured to determine an initial value of an amount of packets which are addressed to a mobile station newly starting a communication in the mobile communication system and are transmitted from the control station to the base station, according to the number of mobile stations which are performing the communication in the mobile communication system.

Data flow amount control device and data flow amount control method

A communication control method includes the step of restricting the number of communication channels used dedicatedly by each of mobile stations or a resource of communication channels used dedicatedly by each of the mobile stations when both communication channel shared by the mobile stations and communication channels used dedicatedly by each of the mobile stations are simultaneously used in a mobile communication system.

Communication control method, radio base station, and radio control station

A radio control method is arranged to use a mobile station, an active setto perform radio communication with the mobile station, and a radio control apparatusfor controlling the radio communication between the mobile stationand the active set, and the radio control method has a determination step wherein in a situation where the mobile station, while performing radio communication through A-DPCH with the active set, performs radio communication through HS-PDSCH with one radio base station included in the active set, the radio control apparatusmakes a determination of maintenance to perform a process of maintaining the radio communication through the HS-PDSCH, on the occasion when the mobile stationgives a change command to change a configuration of the active setso as to result in failure in maintenance of the radio communication through the HS-PDSCH.

Radio control method and radio control apparatus

A communication control method for a mobile communication system having a plurality of mobile stations, a radio base station, and a radio control station comprises a measurement step, an evaluation step, and a control step. In the measurement step, a plurality of congestion parameters related to factors generating congestion is measured in a mobile communication system. In the evaluation step, the radio control station evaluates a congestion degree corresponding to each of the plurality of congestion parameters. In the control step, a communication setting between the radio base station and at least one of the plurality of mobile stations is controlled in accordance with a control instruction transmitted from the radio control station to the radio base station when at least one of the plurality of congestion degrees is a prescribed level or more.

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Yokohama, Japan

Koji Furutani