Nec Corporation

Nec Coproration

Yasushi Maruta

Yassin Aden Awad

Duong Pham

Toshifumi Sato

Shousei Yoshida

Akihisa Ushirokawa

Caroline Liang

Arun Gurung

Yi Jiang

Hisashi Futaki

Sampath Rangarajan

Hiroaki Aminaka

Narayan Prasad

Robert Arnott

Naoto Ishii

Takahiro Nobukiyo

Takahiro Sasaki

Shinya Muraoka

Satoshi Oura

Daisuke Nose

Patricia Wells

A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focused spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Communication system

In order to improve communication in a radio access network, a base stationincludes: a first communication processing unitconfigured to communicate with a terminal apparatusA; and a second communication processing unitconfigured to receive, from base stationsandrespectively communicating with terminal apparatusesB andC, radio resource time length information for specifying a time length of a radio resource for the terminal apparatusesB andC, and hopping pattern information for specifying a frequency hopping pattern for the terminal apparatusesB andC. The first communication processing unitis configured to determine the frequency hopping pattern for the terminal apparatusA, based on the radio resource time length information and the hopping pattern information, and communicate with the terminal apparatusA in accordance with the determined frequency hopping pattern.

Base station, method, program, and recording medium

An object of the present disclosure is to provide a base station, a system, a method, and a program capable of improving DL MU-MIMO characteristics. A base station according to the present disclosure includes: a calculation unit that calculates a spatial multiplexing antenna weight Vof each of a plurality of antennas owned by the base station based on information about at least one spatial multiplexing terminal and Down Link (DL) channel information of the at least one spatial multiplexing terminal; and an interference elimination unit that calculates an interference elimination antenna weight Wthat reduces interference power with respect to other terminals to a desired level or lower based on the spatial multiplexing antenna weight V, and calculates a desired signal power loss PLof the at least one spatial multiplexing terminal based on the spatial multiplexing antenna weight Vand the interference elimination antenna weight W.

Base station, system, method, and non-transitory computer readable medium

Even if the channel reciprocity established between the uplink and the downlink is deteriorated, control the transmission in the downlink is performed properly. A base stationincludes: an information obtaining unitconfigured to obtain downlink channel information based on a downlink channel estimate, and uplink channel information based on an uplink channel estimate; and a control unitconfigured to perform control related to transmission in downlink channel based on a correlation between the downlink channel information and the uplink channel information.

Base station, method, program and recording medium

A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

A relay communications system is described in which a base station is able to support both Frequency diversity Relay Physical Downlink Control Channel (R-PDCCH) transmission and Frequency selective R-PDCCH transmission either within different cells, or within the same cell but not the same sub-frame or within the same cell and within the 5 same sub-frame.

Relay communication system

To provide a communication terminal capable of suppressing an increase in power consumption of a UE during multi-subframe scheduling, a communication terminal () includes a monitoring unit () that monitors control information containing allocation information of at least one subframe where downlink data is transmitted, and a control unit () that determines monitoring timing to monitor the control information in accordance with a decoding result of downlink data transmitted using the at least one subframe. The monitoring unit () monitors the control information at the determined monitoring timing.

Communication terminal, base station, monitoring method, transmission method, and non-transitory computer-readable medium

A MIMO system () and a method of generating a precoder for use in a MIMO system (), when communicating with a UE (), are provided. The method comprises receiving, from the UE (), channel information relating to a channel on which data is transmitted; decomposing the channel information into components representing a transmission component and a signal strength component; and generating the precoder according to the transmission component and the signal strength component.

Method and system for MIMO communication

A method and system for data communication in a Multi-user Multiple-Input and Multiple-Output (MU-MIMO) system is provided. The method includes receiving, from a first UE of the plurality of UEs, first and second channel information relating to first and second subsets of antennae; generating first and second sub-precoders according to the first and second channel information; generating a precoder according at least in part to the first and second sub-precoders; and transmitting data to the first UE using the precoder.

Method and system for MU-MIMO communication

A system includes an eNB which is operable to communicate with one or UEs and a set of multiple transmit antennas associated with the eNB. The antennas are partitioned into multiple antenna subsets. In a first form of the method, one of the antennas is designated as a reference antenna and the reference antenna forms part of each antenna subset. In a second form of the method, one of the subsets is designated as a reference subset. The UE(s) are operable to compute multiple PMIs for the respective multiple subsets and to report the multiple PMIs to the eNB for the eNB to use in precoding. The first form involves computing a PMI for a given antenna subset independently of the PMIs of any of the other antenna subsets. The second form involves computing a PMI for a given subset based on or using the PMI for the reference subset.

Computing PMIs, particularly in wireless communications systems having three-dimensional communications channels, using a reference antenna or a reference antenna subset

Provided is a wireless communication system that efficiently carries out communications between a wireless control device and a wireless device. A wireless control device () has a wireless resource allocation unit () and a wireless resource instruction unit (). The wireless resource allocation unit () allocates wireless resources that are used by a wireless device () when wirelessly communicating with a wireless terminal (). The wireless resource instruction unit () sends, to the wireless device (), instructions for causing the allocated wireless resources to be used. The wireless device () has a wireless signal processing unit () and a wireless transmission unit (). On the basis of the instructions from the wireless control device (), the wireless signal processing unit () performs processing, for performing wireless communications using the allocated wireless resources, on data to be sent to the wireless terminal (). The wireless transmission unit () converts signals processed by the wireless signal processing unit () to wireless signals, and transmits the wireless signals to the wireless terminal ().

Wireless communication system and wireless communication method

A method and system for data communication in a Multiple-Input and Multiple-Output (MIMO) system is provided. The method includes receiving, from a first UE, first channel information relating to a first subset of a plurality of antennae of the MIMO system and second channel information relating to a second subset of a plurality of antennae. The method further includes generating first and second sub-precoders according to the first and second channel information, respectively. A precoder is then generated according at least in part to the first sub-precoder and the second sub-precoder, and data is transmitted to the first UE using the precoder.

Growing community of inventors

Tokyo, Japan

Yasushi Maruta