Nec Corporation

Nahoko Kuroda

Jinsock Lee

Kojiro Hamabe

Kojirou Hamabe

Yoshikazu Kakura

Kenji Koyanagi

Akihisa Ushirokawa

Takahiro Nobukiyo

Mitsuyuki Nakamura

Koujirou Hamabe

Jinsook Lee

Akihisa c/o Nec Corporation Ushirokawa

A base station is provided which notifies a mobile station of transmission power information for an uplink RACH, the mobile station transmits transmission delay estimation information on the RACH to the base station over the RACH at a transmission power based on the transmission power information, and the base station changes the transmission power information according to the transmission delay estimation information and notifies the mobile station of the changed transmission power information. The mobile station retransmits data or a preamble if the mobile station does not receive a notification that the base station has received the data or the preamble correctly after a predetermined time. The base station transmits the transmission power information over a BCH and a CPICH transmitted to a plurality of mobile stations.

Wireless communication system and method of controlling a transmission power

Methods of selecting a transport format combination are provided. For example, a method comprises calculating the transmission power of a first physical channel using each of first TFCs, and determines whether a mobile station is in a transmission capable state. The method also comprises calculating the sum of the transmission power of first and second physical channels using first and second TFCs, with respect to each of combinations of first and second TFCs, and determines whether the mobile station is in the transmission capable state. The method also comprises selecting first TFC from the first TFCs wherein the mobile station is in the transmission capable state and selecting a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC. The data is transmitted using the selected first and second TFCs, respectively.

Transport format combination selecting method, wireless communication system, and mobile station

There is provided a wireless communication system which can synchronize a mobile station with a destination base station in response to the mobile station determining to switch base stations. Each base station generates synchronization information to synchronize the mobile station with the base station from a reverse pilot signal received from the mobile station, generates reverse propagation quality information from the reverse pilot signal, and generates and transmits a control signal including the synchronization information and the reverse propagation quality information. A mobile station generates and transmits a reverse pilot signal, receives a signal including the control signal from each of the base stations.

Synchronization system and synchronizing method for plurality of base stations and mobile station in a reverse link wireless transmission

The mobile station-determines whether a current maximum transmission rate is sufficient or not in a predetermined cycle by using a maximum transmission rate R indicated by a pointer, a volume Q of data accumulated in the buffer-and a requested delay T determined according to service of data. The mobile station-transmits a determination result as an RR signal in a predetermined control signal field within an uplink E-DPCH to the base station. The base stationreceives an RR signal from the mobile station-, determines an increment/decrement of the maximum transmission rate allowed for the mobile station-to use such that a noise rise fails to exceed a predetermined threshold value and notifies the mobile station-of the determination as an RG signal by a downlink E-DPCCH. The mobile station-ups or downs the position of the pointer according to the RG signal.

Radio communication system, mobile station, base station, radio communication system control method used for the same, and program of the same

A wireless communication system of the present invention achieves improvement of reliability of communication of control data while suppressing the decrease in the communication throughput of data blocks and/or control data. The wireless communication system of the present invention is provided with a base station () and a mobile station (). The mobile station () is configured to transmit a plurality of data blocks to the base station () at predetermined transmission time intervals. One of the base and mobile stations is configured to generate a plurality of control data used for control of transmission of said plurality of data blocks, to generate a plurality of control messages from said plurality of control data, and to transmit said plurality of control messages to the other of the base and mobile stations. Each of the control data is used for generation of M control messages out of the plurality of control messages, and each of the control messages is generated from M control data out of the plurality of control data.

Wireless communication system, wireless communication method, and wireless communication apparatus

A mobile station calculates the transmission power of a first physical channel using each of first TFCs, and determines whether the mobile station is in a transmission capable state or not. Then, the mobile station calculates the sum of the transmission power of first and second physical channels, with respect to each of combinations of the first and second TFCs, and determines whether the mobile station is in the transmission capable state or not. Then, the mobile station selects a first TFC from the first TFCs wherein the mobile station is in the transmission capable state. Then, the mobile station selects a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC. Thereafter, data is transmitted using the selected first and second TFCs, respectively.

There is provided a radio communication method capable of reducing inter-cell interference. In a radio communication system in which each of a plurality of base stations performs radio communication with a mobile station by using one of frequency blocks, the base stations transmit pilot signals using frequency blocks and the mobile station measures the reception quality of the pilot signals of the first base station, measures the reception quality of the pilot signals transmitted by the second base station, generates channel quality information for the frequency block according to the reception quality of the pilot signal of the first base station and the reception quality of the pilot signal of the second base station, and transmits the channel quality information to the first base station.

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Tokyo, Japan

Nahoko Kuroda