Ntt Docomo, Inc.

The University of Tokyo

Nanocarrier Co., Ltd.

Atsushi Harada

Minami Ishii

Sadayuki Abeta

Anil Umesh

Xiaolin Hou

Mikio Iwamura

Satoshi Nagata

Chongning Na

Hiroyuki Ishii

Takehiro Nakamura

Anxin Li

Kazunori Kataoka

Shigeto Fukushima

Keiji Itaka

Naoki Kanayama

Chunyi Wang

Kazuki Takeda

Mamoru Sawahashi

Hidetoshi Kayama

Yukio Nagasaki

Masayuki Motegi

Masao Kato

Xiaohang Chen

Yasuo Sato

Daisuke Wakebayashi

The embodiments of the present invention provide an uplink resource scheduling method, a wireless base station and a mobile station. The method comprises: generating group dedicated signaling respectively for mobile station groups managed by the wireless base station, wherein group dedicated signaling of each mobile station group indicates uplink resources allocated to the mobile station group; multiplexing the generated group dedicated signaling into different positions of a first channel and transmitting the multiplexed group dedicated signaling; generating mobile station dedicated signaling for each mobile station in each of the mobile station groups, wherein the mobile station dedicated signaling at least includes group information indicating the mobile station group to which the mobile station belongs; and multiplexing the generated mobile station dedicated signaling into a second channel and transmitting the multiplexed mobile station dedicated signaling.

Uplink resource scheduling method, wireless base station and mobile station

The present disclosure provides a base station, a communication system and a method thereof. The communication system includes three base stations adjacent to each other, and each base station serves at least one UE. The method includes: acquiring, by each base station, a channel matrix of a channel from the base station to an adjacent base station; calculating an interference alignment-based transmission precoding matrix for each base station based on the channel matrices of the channels between the base stations; and precoding, by each base station, data to be transmitted with the interference alignment-based transmission precoding matrix.

Base station, communication system and method thereof

A radio base station capable of reducing the impact of interference and improving the efficiency of the use of radio resources even when different DL/UL configurations are employed between neighboring transmitting/receiving points is disclosed. The radio base station can communicate with user terminals via time division duplex and is able to change and control DL/UL configurations, has a subframe type determining section that classifies subframes into fixed subframes or flexible subframes, in accordance with the relationship between the DL/UL configurations that are employed in the radio base station and the DL/UL configurations that are employed in other radio base stations, and a frequency allocation control section that applies mutually different frequency allocation methods to the fixed subframes and the flexible subframes.

Radio base station, user terminal and radio communication method

The present invention is designed to feed back feedback signals such as delivery acknowledgement signals properly even when the DL/UL configuration is reconfigured in TDD. A user terminal communicates, in time division duplexing, with a radio base station that reconfigures the DL/UL configuration, and has a judging section that judges a delivery acknowledgement in response to each DL subframe, and a feedback control section that allocates a delivery acknowledgement signal in response to each DL subframe to a UL subframe and sends feedback, and, when the number of DL subframes that correspond to a UL subframe is greater than a predetermined value in a radio frame after the reconfiguration of the DL/UL configuration, the feedback control section bundles at least part of the delivery acknowledgement signals for a plurality of DL subframes corresponding to the UL subframe, and sends feedback.

User terminal, radio base station and radio communication method

In order to avoid interference efficiently and control the amount of radio resources that are not used for interference avoidance, the present invention provides a radio base station connected to a neighbor radio base station via inter-radio base station interface. The radio base station has: a radio communication section that performs radio communication with a user terminal using a UL/DL configuration indicating a configuration of uplink and downlink subframes in a radio frame; an interference detecting section that measures and detects interference that the radio base station suffers from; and a selecting section that uses an interference detection result as a basis to determine which to apply to each subframe, between a resource allocation-unrestricted scheme and an inter-cell uplink/downlink orthogonalization scheme.

Radio base station, radio communication system and radio communication method

The present invention is designed to reduce the impact of interference even when different DL/UL configurations are applied between neighboring transmission points (radio base stations). A radio base station which can communicate with a user terminal by means of time division duplexing, and furthermore change and control the DL/UL configuration, has an interference measurement section that measures the interference level from other radio base stations in at least a UL subframe, and a scheduling control section that changes the feedback method of uplink control signals, which the user terminal feeds back in the UL subframe in response to downlink signals that have been transmitted in DL subframes, based on the measured interference level.

The embodiments of the present invention provide a mobile communication method, a wireless base station and a mobile station. The mobile communication method according to the embodiment of the present invention is applied to the wireless base station. The method comprises: determining resource group offset information used for a mobile station; offsetting an initial physical channel resource group allocated to the mobile station according to the resource group offset information; determining cyclic shift information of demodulation reference signal used for the mobile station according to unused physical channel resources in the offset physical channel resource group; and transmitting the resource group offset information and the cyclic shift information to the mobile station.

Mobile communication method, wireless base station and mobile station

A method for transmitting control information in a wireless communication system includes: determining a link adaptation method of a user group according to quality of channels of each user in the user group; generating first control information according to common control information of all users in the user group and the link adaptation method corresponding to the user group, and transmitting the first control information to each user in the user group; obtaining contents of second control information according to particular control information of each user in the user group; performing link adaptation process for the contents of the second control information according to the link adaptation method corresponding to the user group, generating the second control information, and transmitting the second control information to each user in the user group. Corresponding to the above-described method, a method for receiving control information in a wireless communication system and corresponding devices are also disclosed.

Method and device for transmitting control information in wireless communication system

The transmitter and a mobile terminal based on interference alignment use pre-coding and pre-decoding methods. An antenna mapping matrix is computed according to a downlink channel state information, wherein the antenna mapping matrix is used for antenna mapping for the current transmitter to perform interference alignment. A multi-cell pre-coding matrix according to the downlink channel state information and the antenna mapping matrix; a single cell multi-user pre-coding matrix and pre-coding user data using the single cell multi-user pre-coding matrix and the multi-cell pre-decoding matrix and performing an antenna mapping using the antenna mapping matrix are computed. A system which cannot use the interference alignment method directly may be transformed to use the interference alignment method directly. In addition, the interference suppression between cells and the interference management inside cells are two separate processes, in which different linear pre-coding and decoding methods may be used.

Pre-coding method, pre-decoding method, transmitter and mobile terminal based on interference alignment

A mobile station is configured to send a base station a buffer status report explicitly indicating that the amount of a transmission signal in a buffer of the mobile station has become zero. This configuration makes it possible to efficiently allocate radio resources of an uplink shared channel and thereby to increase uplink capacity.

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

A communication control method used by a base station to allocate a radio resource to a user terminal which performs different-frequency measurement includes the steps of transmitting to the base station, by the user terminal, a request indicating whether a measurement gap for different-frequency measurement is needed, when a need for data communications between the user terminal and the base station arises while the user terminal is performing discontinuous reception; and controlling, by the base station, the radio resource allocated to the user terminal based on whether the measurement gap is needed.

Communication control method, base station, and user terminal

A base station apparatus includes a unit configured to determine a discontinuous reception pattern for a user apparatus that is classified according to a channel state of a radio link; and a unit configured to report the discontinuous reception pattern to the user apparatus. The discontinuous reception pattern specifies at least a cycle of discontinuous reception.

Base station apparatus and method used for mobile communication system

In a mobile communication method by which a mobile station (UE) transmits a control signal to a radio base station (eNB) in an uplink by using an uplink dedicated resource, different methods for determining whether or not a synchronization state is established in the uplink, are used depending on whether or not the uplink dedicated resource is set up.

Mobile communication method and radio base station

A user apparatus in a mobile communication system includes: a unit configured to receive a downlink control signal using a frequency of a residing cell; and a unit configured to perform cell search using a frequency different from the frequency of the residing cell during an interval between reception timings of the downlink control signal in response to an occurrence of a predetermined event for different frequency measurement in the user apparatus or a base station apparatus. When the reception timing interval of the downlink control signal is not longer than the threshold reported from the base station apparatus, and when the predetermined event for different frequency measurement occurs in the user apparatus or the base station apparatus, different frequency measurement is performed in a cycle, different from the reception timing interval, reported from the base station apparatus.

User apparatus, base station apparatus and method used in mobile communication system

A mobile station performing a voice communication by using a radio resource, including a determination unit configured to determine whether an inputted packet is in a talk-spurt state or in a silent state; a message generating unit configured to generate a resource release request, when the determination unit determines that the inputted packet is in the silent state; and a transmitting unit configured to transmit the resource release request to a radio base station.

Growing community of inventors

Kawasaki, Japan

Atsushi Harada