Ntt Docomo, Inc.

Ntt Mobile Communications Network, Inc.

Ntt Decomo, Inc.

Takehiro Nakamura

Minami Ishii

Masafumi Usuda

Anil Umesh

Sung Uk Moon

Hiroyuki Ishii

Seizo Onoe

Mikio Iwamura

Yasuhiro Kato

Masayuki Motegi

Sadayuki Abeta

Etsuhiro Nakano

Wuri Andarmawanti Hapsari

Yoshihiro Ishikawa

Akihito Hanaki

Shinya Tanaka

Takahiro Hayashi

Mayu Yamada

Motohiro Tanno

Koji Ohno

Hiroshi Kawakami

Motoshi Tamura

Kouji Ohno

Junichiro Hagiwara

Yoshiaki Ofuji

Akihiro Higashi

Masatomo Nakano

Hiroki Morikawa

Koichi Okawa

Satoshi Nagata

Takaaki Sato

Yoshitsugu Shimazu

Masayuki Koshino

Yoshimasa Imamura

Takuya Sato

Hideaki Takahashi

Atsushi Harada

Shinji Uebayashi

Shinji Ueda

Yoshihisa Kishiyama

Kazuaki Takeda

Takashi Suzuki

Narumi Umeda

Katsuhiko Yamagata

Hidehiro Ando

Tomoki Sao

Tetsushi Abe

Yuki Inoue

Masafumi Masuda

Akihiro Maebara

Takuya Hamajima

Yutaka Ohto

Yoshitaka Hiramoto

Akira Hiroike

Noriteru Shinagawa

Yoshiaki Oofuji

Takaaki Satoh

Jyunichiro Hagiwara

A system for supporting smooth mobility of a mobile terminal apparatus between a plurality of local areas that are arranged in a wide area is disclosed. The system includes a wide area base station apparatus that covers a wide area, a local area base station apparatus that covers a local area arranged in the wide area, and a mobile terminal apparatus that can communicate with the wide area base station apparatus and the local area base station apparatus, and is configured to scramble a data signal and a reference signal by a scrambling sequence that is common between a plurality of local areas in communication between the local area base station apparatus and the mobile terminal apparatus.

Communication system, mobile terminal apparatus, local area base station apparatus and communication method

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 mobile communication method according to the present invention includes the steps: transmitting, from an exchange (MME) to a first radio base station (eNB), a location information reporting instruction which provides an instruction to report location information on a mobile station (UE); reporting, the first radio base station (eNB) to the exchange (MME), the location information on the mobile station (UE), in accordance with the location information reporting instruction; transmitting, the location information reporting instruction to a second radio base station (eNB), in a handover procedure of the mobile station (UE) from the first radio base station (eNB) to the second radio base station (eNB); and reporting, from the second radio base station (eNB) to the exchange (MME), the location information on the mobile station (UE), in accordance with the location information reporting instruction.

Mobile communication method and radio base station

The present invention is designed to provide highly efficient small cell radio access. In a communication system to include a macro station (), a local station (), and a mobile terminal apparatus (), the local station () generates measurement signals that are used in measurements in the mobile terminal apparatus () based on user an identifier or a user group identifier, and transmits this signal to the mobile terminal apparatus (). The mobile terminal apparatus () receives the measurement signals transmitted from the local station () and carries out with measurements with respect to the measurement signals based on the user identifier or the user group identifier.

Communication system, base station apparatus, mobile terminal apparatus and communication method

A communication control device includes a parameter acquisition unit which acquires a first parameter determined on the basis of the number of mobile stations connected to the first cell or the number of mobile stations connected to the second cell, a parameter determination unit which changes the number of mobile stations connectable to the first cell or the number of mobile stations connectable to the second cell on the basis of the first parameter, and a parameter notification unit which notifies at least any one of the first base station and the second base station of the determined second parameter.

Communication control device and communication control method

The present invention is designed to make effective use of radio resources in VSEC to output a plurality of beams of varying tilt angles for sectorization in vertical directions. A radio communication method for a radio base station that outputs a plurality of beams of varying tilt angles and forms a plurality of cells that are sectorized vertically, and a user terminal that establishes wireless connection with the radio base station, provides the steps in which the radio base station acquires information about the communication capacity of each of the plurality of cells, and controls the vertical plane beam width and/or transmission power of each cell and sets the coverage area of each cell so that differences in communication capacity between the plurality of cells are reduced.

Radio base station, radio communication system and radio communication method

A mobile communication method according to the present invention includes: notifying, from a network node () to a mobile station (), a communication service provided by a target radio access technology in which the mobile station () is to be in idle mode; storing, at the mobile station (), the communication service notified by the network node (); and starting, at the mobile station (), a connection procedure on the basis of the stored communication service.

Mobile communication method, mobile exchange station, radio base station and mobile station

A mobile communication system is provided that performs bi-directional communications between a mobile station and a wireless access network device. The mobile station includes a connection set-up signal reception timing calculation unit for calculating a reception timing of a connection set-up signal when a connection request signal is transmitted, and a connection set-up signal reception determination unit that determines, according to the reception timing, whether the connection set-up signal is received, and performs a signal reception operation based on the determination. The wireless access network device includes a connection set-up signal scheduling unit that, after receiving a connection request signal from the mobile station, performs a connection set-up signal transmission assignment based on a reception timing of the connection request signal, a connection set-up signal generation unit that generates a connection set-up signal to be sent to the mobile station; and a connection set-up signal transmission unit that transmits the connection set-up signal based on the connection set-up signal transmission assignment.

Mobile station, wireless access network device, mobile communication system, and communication method

In a mobile communication system according to the present invention, the mobile communication system is configured to manage a specific mobile station which is allowed to communicate through a CSG cell under the control of a home base station (Home-eNB); and a general mobile station (UE) other than the specific mobile station is configured to be capable of using the CSG cell as a camped cell, only when broadcast information indicating an allowance of a camping in the specific cell is received.

Mobile communication system, home base station, and mobile 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 handover method according to the present invention includes the steps of: forwarding, at a handover-source radio base station (eNB), user data (A) for a mobile station (UE) to a handover-target radio base station (eNB) when it is determined that a handover processing is to be performed, the user data (A) being stored in the handover-source radio base station (eNB); activating, at the handover-target radio base station, a predetermined timer when transmitting a path switch request to a path control apparatus, and storing second user data for the mobile station received from the path control apparatus until the predetermined timer expires; and forwarding, at the handover-target radio base station, the stored second user data to the mobile station after the predetermined timer expires.

Handover method and radio base station

It is an object of the present invention to provide a mobile station which enables transmission of control information on broadcast communication or multicast communication to a radio network controller without establishing a dedicated channel in broadcast communication or multicast communication. The mobile station related to this invention includes a control information generating unit () for generating control information on broadcast communication or multicast communication, a control information identifier adding unit () for adding a control information identifier for specifying a type of the control information to the control information, and a transmitting unit () for transmitting the control information to a radio network controller (RNC) via a common channel.

Broadcast communication or multicast communication-capable mobile station

A cell selection method includes steps of: (A) determining, at a mobile station (UE), whether or not a first CSG cell satisfies a predetermined condition, when using a first macro cell as a camped cell; and (B) changing, at the mobile station (UE), the camped cell from the first macro cell to a first CSG cell, when determined that the first CSG cell satisfies the predetermined condition.

Cell selection method and mobile station

A tracking area setting apparatus is disclosed that includes a service request measurement unit measuring a frequency of occurrence of a service request transmitted by a user equipment terminal to a cell where the user equipment terminal is located based on a paging channel transmitted in all cells belonging to a tracking area where the user equipment terminal is located, the user equipment terminal being a target user equipment terminal to receive a call, the tracking area including one or more cells and a tracking area determination unit determining whether a number of the frequency of occurrence of the service request in a predetermined cell is equal to or greater than a predetermined threshold value based on the frequency of occurrence of the service request and, when determining yes, separate the predetermined cell from the tracking area to which the predetermined cell belongs.

Tracking area setting apparatus, user equipment, and tracking area setting method

Embodiments of the present invention make it possible to reduce loss and delay of downlink user data transmitted at regular time intervals in a mobile communication system employing a hard handover method, and make it possible to easily perform high-quality handover solely by a handover-starting base station. A base station for transmitting downlink user data at regular time intervals to a mobile station is disclosed. The base station is configured to transmit a handover-command signal immediately after transmitting the downlink user data to the mobile station.

Base station and handover control method

Growing community of inventors

Yokohama, Japan

Takehiro Nakamura