Ntt Docomo, Inc.

Baicells Technologies Co. Ltd.

Xiang Yun

Lan Chen

Satoshi Nagata

Xiaoming She

Jianchi Zhu

Mingju Li

Yu Jiang

Jing Wang

Hirohito Suda

Yang Song

Hiroyuki Ishii

Yoshihisa Kishiyama

Kazuaki Takeda

Yuichi Kakishima

Juejia Zhou

Anass Benjebbour

Shimpei Yasukawa

Ozgun Bursalioglu

Bijun Zhang

Chen Lan

The present disclosure relates to an emergency communication method and device. The emergency communication method includes: receiving an emergency communication request issued from a calling device to a called device; searching for communication devices within a set range of the called device; selecting, from the communication devices found in the searching, communication devices having an emergency communication auxiliary function which is in an on state as auxiliary devices; and establishing a communication connection between the calling device and the auxiliary devices, so that a user of the calling device communicates with a user of the called device through the auxiliary devices. The present disclosure can realize emergency communication in real time, which is convenient and fast, and ensures the timely establishment of emergency communication.

Emergency communication method and apparatus

Various embodiments of the present disclosure provide a demodulation method, device, terminal, and system. The demodulation method includes: obtaining communication information of a cell; blindly demodulating a synchronization signal in the communication information to obtain a blind-demodulation result; determining time range information carried by the communication information according to the blind-demodulation result; and demodulating the communication information according to the time range information.

Demodulation method, device, terminal and system

The present disclosure discloses a transmission processing method and device. The transmission processing method includes: performing uplink scheduling for a User Equipment (UE) in accordance with an uplink scheduling criterion, and determining whether to apply puncturing in accordance with an uplink scheduling result and/or determining whether to instruct the UE to apply the puncturing via signaling in accordance with the uplink scheduling performed for the UE. The uplink scheduling criterion is preset and is for limiting the uplink scheduled UE to reduce a number of puncturing operations. In the prior art, an uplink scheduled UE that is transmitting data needs to be instructed to apply puncturing in a fixed position of a subframe whenever a new uplink scheduled UE appears in a wireless communication system, resulting in a technical problem of a low transmission rate, which is solved in the present disclosure.

Transmission processing method and device

The present invention is designed so that it is possible to feed back channel state information (CSI) that is suitable for downlink communication in which 3D beams are used. The radio communication method of the present invention is a radio communication method to allow a radio base station to carry out downlink communication with a user terminal by using a 3D beam that is formed with a horizontal beam having directivity in a horizontal plane and a vertical beam having directivity in a vertical plane, and has the steps in which the radio base station transmits a plurality of measurement reference signals that are pre-coded using different precoding weights between a plurality of vertical beams, and the user terminal transmits channel state information that is generated based on the plurality of measurement reference signals, to the radio base station.

Radio communication system that feeds back channel state information (CSI)

The present invention is designed to feed back a plurality of pieces of CSI with respect to each transmission point, when CoMP transmission is applied in the framework of carrier aggregation. The radio communication method according to the present invention is a radio communication method in a radio communication system including a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multi-point transmission/reception with the plurality of radio base station apparatuses, and, in this radio communication method, when coordinated multi-point transmission is applied, the radio base station apparatus, transmits CSI set information on a set including at least one CSI through higher layer signaling, and also transmits CSI request information in DCI, and the user terminal feeds back CSI based on the CSI set information and the CSI request information.

Radio communication system and method for feeding back a plurality of pieces of channel state information under coordinated multi-point transmission

The present invention is designed to use radio resources effectively and improve the throughput of a radio communication system even when a plurality of small cells are placed densely. A radio base station controls the connecting cell of a user terminal, and has a selection section that selects candidate cells, the received power and/or the received quality of which in the user terminal is equal to or greater than a predetermined value, and a determining section that calculates the amount of data to transmit to serving user terminals, for each candidate cell, by taking into account the frequency band that is used, and determines a candidate cell where the amount of data is small, as the connecting cell of the user terminal.

Radio base station, user terminal and radio communication method

A radio communication system including a plurality of radio base stations and a user terminal that is capable of coordinated multiple point transmission with the plurality of radio base stations is provided, and, in this radio communication system, a radio base station has a generating section that generates parameter information related to downlink signals, a control information generating section that generates downlink control information that includes an indicator to represent specific parameter information, a control section that controls whether or not to configure a bit field for the indicator of the parameter information in the downlink control information, and a transmission section that transmits information as to whether or not the bit field for the indicator of the parameter information is configured, to the user terminal, by higher layer signaling.

Radio communication method, radio communication system, radio base station and user terminal

To make it possible to feed back channel state information adequately even when a plurality of pieces of channel state information are generated in a user terminal, a user terminal that is configured to be able to conduct coordinated multi-point transmission/reception with a plurality of radio base stations has a generating section that generates a plurality of kinds of channel state information using channel state measurement reference signals transmitted from each radio base station, a selection section that selects predetermined channel state information to feed back, from the plurality of kinds of channel state information, and a transmission section that feeds back the predetermined channel state information to the radio base station via an uplink control channel, and the selection section selects the predetermined channel state information based at least on the priorities assigned to the resource indices of channel state measurement reference signals corresponding to each channel state information.

User terminal, radio communication system, radio communication method and radio base station

To perform rate matching appropriately even when downlink signals are transmitted from a plurality of transmission points to a user terminal, a radio communication system having a user terminal capable of coordinate multi-point transmission and reception with several radio base stations is provided. A radio base station transmits downlink control information including bit information defining a predetermined rate matching pattern to the user terminal. The user terminal receives the downlink control information and performs rate matching based on the bit information defining the rate matching pattern. A combination of a cell-specific reference signal pattern and an interference measurement reference signal pattern in the case of transmission from several radio base stations each using an MBSFN subframe or NCT is defined in predetermined bits. The user terminal performs rate matching based on the bit information and the subframe configuration and interference measurement reference signal pattern of the radio base station.

Radio communication system, radio communication method, user terminal and radio base station

A base station receives channel state information corresponding to each of spare coordinated groups from each of user devices. A first group includes a plurality of coordinated groups arranged in advance. The spare coordinated groups corresponding to each user device are such as selected from the first group and include at least a service sector of best channel quality obtained measurement by the user device. The base station specifies a user device group corresponding to each of coordinated groups contained in each of coordinated group patterns. The user device group corresponding to the coordinated group is formed of user devices having the coordinated group in their spare coordinated groups. The base station uses channel state information reported from the user devices of the user device group corresponding to the coordinated group as a basis to perform user scheduling on the coordinated group.

Communication processing method and base station

The present invention is designed to prevent the decrease of throughput and also reduce the overhead of CSI feedback when CoMP transmission is applied. A radio base station is configured to be able to perform coordinated multiple-point transmission/reception with a user terminal, and includes a detection section configured to detect a retransmission control signal fed back from the user terminal, and a CQI updating section configured to update a CQI for coordinated multiple-point transmission/reception using received quality information in each cell, and the CQI updating section updates the CQI using a calculating formula that is defined with the received quality information in each cell and a variable which changes the value depending on the content of the retransmission control signal.

Radio base station, user terminal, radio communication method and radio communication system

The present invention is designed to, upon updating CQIs that are fed back, prevent the increase of the overhead of feedback information, and still improve the accuracy of the updated CQIs when CoMP transmission is applied. The radio communication system of the present invention is formed with a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, and the user terminal acquires channel state information of multiple cells, generates feedback information such that the channel state information of multiple cells is allotted and transmitted in a plurality of subframes, and feeds back the generated feedback information to the radio base station apparatus of one of the multiple coordinated points, using a physical uplink shared data channel.

Radio communication system, user terminal, radio base station apparatus and radio communication method

To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized by including, in a user terminal measuring quality information for each of cells to perform Coordinated Multi-Point transmission, and notifying a radio base station apparatus of the quality information, in the radio base station apparatus calculating a quality difference between the cells to perform Coordinated Multi-Point transmission, by using the quality information for each the cells from the user terminal, determining granularity of inter-cell channel state information for each of the cells based on the quality difference, and notifying the user terminal of the granularity, and, in that the user terminal generating inter-cell channel state information for each of the cells according to the granularity from the radio base station apparatus, and transmitting the inter-cell channel state information for each of the cells to radio base station apparatuses of cells to perform Coordinated Multi-Point transmission.

Radio communication system, radio base station apparatus, user terminal and radio communication method

In order to signal information that is required in rate matching efficiently, even when CoMP transmission/reception techniques are employed, CoMP transmission is scheduled, in which a plurality of radio base station apparatuses (eNBs) serve as transmission points and carry out coordinated multi-point transmission with respect to a user terminal (UE), downlink control information is generated, in which a rate matching pattern is incorporated, in a physical downlink control channel, based on a table, in which rate matching patterns that are required are mapped to bit data in association with transmission modes in CoMP transmission, a physical downlink control channel is transmitted and also a physical downlink shared data channel is transmitted, to the user terminal (UE), and in the user terminal (UE), the rate matching pattern incorporated in the downlink control information, is specified, based on a table of the same contents as in the radio base station apparatuses (eNBs).

Radio communication system, radio base station apparatus, user terminal and communication control method

In order to recognize a relatively accurate channel state of each UE, a channel of the UE is reconfigured based on channel phase information and channel quality information reported from the UE to obtain a channel matrix of the UE. Besides, a channel of the UE is reconfigured based on channel phase information and channel quality information reported from the UE to obtain a channel matrix of the UE, a precoding matrix of the UE is determined based on the channel matrix of the UE, and precoding is performed on data to transmit to the UE, using the precoding matrix.

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Beijing, China

Xiang Yun