Ntt Docomo, Inc.

Masafumi Usuda

Anil Umesh

Takehiro Nakamura

Hiroyuki Ishii

Minami Ishii

Akihito Hanaki

Sung Uk Moon

Yoshihiro Ishikawa

Seizo Onoe

Hidehiro Ando

Yoshimasa Imamura

Yukihiko Okumura

Takuya Sato

Mayu Yamada

Shinya Tanaka

Sadayuki Abeta

Yasuhiro Kato

Kouji Makino

Shinichi Sasaki

It is an objective of the present invention to suppress an influence on a downlink and to appropriately control a transmission rate of uplink user data. A mobile communication system according to the present invention includes: a transmission section for transmitting to a mobile station an exclusive channel for notifying a mobile station of transmission rate information regarding a transmission rate of user data of an uplink channel; and a transmission rate control section for determining transmission rate information to be used by the mobile station and to instruct the mobile station to receive the exclusive channel for notifying the determined transmission rate information. The transmission section transmits, to the mobile station, the exclusive channel for notifying the determined transmission rate information.

Mobile communication system, wireless control station, wireless base station, mobile station, and mobile communication method

A radio resource control method of controlling a radio resource for transmitting user data by a mobile station via an uplink, including: sending, from a radio base station, a signal indicative of a reduction of a maximum allowable transmission rate of the user data signaled to the mobile station connected to the radio base station, to a radio network controller; and controlling, at the radio network controller, the radio resource based on the reported signal indicative of the reduction of the maximum allowable transmission rate.

Radio resource control method, radio base station, and radio network controller

A transmission rate control method for controlling a transmission rate of uplink user data which is transmitted from a mobile station located in a predetermined cell to a radio base station, includes: notifying, from the radio base station to the mobile station, a transmission power offset of an Enhanced Dedicated Physical Data Channel to a Dedicated Physical Control Channel using a Common Absolute Grant transmission rate control signal which is transmitted through an E-DCH Absolute Grant Channel; transmitting, at the mobile station, the uplink user data based on the notified transmission power offset, at a determined portion of HARQ process after receiving the Common Absolute Grant transmission rate control signal.

Transmission rate control method, mobile station, radio network controller, and radio base station

The present invention relates to a mobile communication system which applies a high-speed downlink packet transmission scheme (HSDPA scheme) in a downlink and an enhanced uplink packet transmission scheme (EUL scheme) in a uplink between a mobile station and a base station. In the mobile communication system according to the present invention, a serving cell in the high-speed downlink packet transmission scheme for a specified mobile station and a serving cell in the enhanced uplink packet transmission scheme for the specified mobile station are modified so as to become the same cell.

Mobile communication system, mobile device, and control device

A transmission power control method for controlling a transmission power of an E-AGCH including an absolute transmission rate of uplink user data, which is transmitted from a cell controlled by a radio base station to a mobile station, includes: notifying, from a radio network controller to the radio base station which controls a serving cell, an offset between the transmission power of the E-AGCH and a transmission power of a DPCH, when the mobile station is performing a soft-handover with the serving cell and non-serving cells; determining, at the serving cell to which the offset is notified, the transmission power of the E-AGCH based on the notified offset; and transmitting, at the serving cell, the E-AGCH to the mobile station using the determined transmission power.

Transmission power control method, and mobile communication system

A radio network controller includes: a determination unit configured to determine a transmit diversity method to be used to transmit a signal from a base station to a mobile station, in accordance with a soft handover status of the mobile station; and an instruction/notification unit configured to instruct the transmit diversity method to the base station, in accordance with the determination result by the determination unit.

Radio network controller, base station, mobile station, mobile communication system and mobile communication method

It is an object of the present invention, in a mobile communication system using the Enhanced Uplink, to maximize a capacity of a radio resource for use in a circuit switching channel, and to provide a data communication as a best effort service using an available radio resource. The present invention includes, in the mobile communication system, a step of measuring an enhanced noise rise within a predetermined frequency bandwidth, a step of measuring a total interference noise rise within the predetermined frequency bandwidth, and a step of determining whether or not to set a new channel within the predetermined frequency bandwidth based on the enhanced noise rise and the total interference noise rise in response to a setup request for the new channel from a mobile station UE.

Mobile communication method, base station and wireless line control station

A transmission rate control method for controlling a transmission rate of user data transmitted by a mobile station via a logical channel, include: notifying, at a radio network controller, a guaranteed bit rate of the logical channel to the mobile station; and controlling, at the mobile station, a transmission rate of uplink user data to be transmitted via the logical channel without following a command in a relative rate grant channel received from a cell to which the mobile station connects.

Transmission rate control method, and mobile station

The present invention enables, in a mobile communication system using 'EUL', to enhance radio quality by certainly allocating hardware resources at a radio base station. A transmission rate control method according to the present invention includes a step of transmitting, from the radio base station to a mobile station, an RGCH for instructing to increase the transmission rate of uplink user data, only when the radio base station has successfully received the uplink user data transmitted from the mobile station.

Transmission rate control method, mobile station and radio base station

A user data transmission method for transmitting uplink user data via an E-DPDCH, including: determining, at a radio network controller, that the mobile station transmitting the E-DPDCH to only a first cell transmits the E-DPDCH to the first cell and a second cell; notifying, at the radio network controller, E-HICH decoding information for decoding a E-HICH for the uplink user data to be transmitted by the second cell, to the mobile station based on the determination; transmitting, at the mobile station, the E-DPDCH to the first cell and the second cell, after the E-HICH decoding information is received; and decoding, at the mobile station, the E-HICH for the uplink user data to be transmitted from the second cell based on the E-HICH decoding information, and performing a retransmission control of the uplink user data toward the second cell based on the decoded E-HICH for the uplink user data.

User data transmission method, and radio network controller

An uplink radio resource allocation method allocates, at a radio base station, an uplink radio resource used for uplink user data transmission to a mobile station. The method includes: allocating, at the radio base station, the uplink radio resource, so that total received power in an particular cell of the radio base station is equal to a first target value assigned by a radio network controller; and allocating, at the radio station, the uplink radio resource, so that a ratio of first received power from a serving mobile station to second received power from a non-serving mobile station is equal to a second target value assigned by the radio network controller, a serving cell of the serving mobile station being the particular cell, a non-serving cell of the non-serving mobile station being the particular cell.

Uplink radio resource allocation method, radio base station, and radio network controller

A transmission power control method for controlling a transmission power of an E-DPCCH, includes: determining, at a radio network controller, that a mobile station transmitting the E-DPCCH to only a first cell should transmit the E-DPCCH to the first cell and a second cell; determining, at the radio network controller, an E-DPCCH Transmission Power Offset which is an offset from a transmission power of a DPCCH based on the determination; notifying, at the radio network controller, the E-DPCCH Transmission Power Offset to the mobile station; determining, at the mobile station, the transmission power of the E-DPCCH to be transmitted to the first cell and the second cell, based on the notified E-DPCCH Transmission Power Offset; and transmitting, at the mobile station, the E-DPCCH to the first cell and the second cell using the determined transmission power.

Transmission power control method, and radio network controller

A transmission power control method for controlling a transmission power of an E-RGCH for uplink user data transmitted from a cell controlled by a radio base station to a mobile station, includes: notifying, from a radio network controller to at least one radio base station controlling a first cell and a second cell, offsets between the transmission power of the E-RGCH and a transmission power of a DPCH, when a mobile station is performing a soft-handover with the first and second cell; determining, at the first cell, a transmission power of a first E-RGCH based on a notified offset, and transmitting the first E-RGCH to the mobile station using the determined transmission power; and determining, at the second cell, transmission power of a second E-RGCH based on a notified offset, and transmitting the second E-RGCH to the mobile station using the determined transmission power.

Transmission power offset arbitration between base stations during soft handoff

A transmission rate control method for controlling a transmission rate of uplink user data, based on a received relative transmission rate of the uplink user data which is transmitted via an E-RGCH, includes: transmitting, at a radio base station, any one of Up command which instructs to increase the transmission rate of the uplink user data, Down command which instructs to decrease the transmission rate of the uplink user data, or Don't care command which instructs to maintain the transmission rate of the uplink user data, to the mobile station via the E-RGCH, as the relative transmission rate; and maintaining, at the mobile station, the transmission rate of the uplink user data, when the mobile station receives the Down command or the Don't care command, and when the uplink user data to be transmitted become empty in a transmission buffer of the mobile station.

The present invention relates to a channel allocating method for an IP multimedia subsystem which connects a radio access network and an IP network to provide voice communication and non-voice communication. In the channel allocating method according to the present invention, an enhanced dedicated channel is allocated to a channel for voice communication in a radio uplink, so as to improve a utilization efficiency of radio resources (hardware resources) and to prevent degradation of network capacity, in the channel for voice communication in the IMS.

Growing community of inventors

Tokyo, Japan

Masafumi Usuda