China Academy of Telecommunications Technology

Datang Mobile Communications Equipment Co., Ltd.

Other

Wenhong Chen

Qiubin Gao

Hui Li

Runhua Chen

Ying Peng

Rakesh Tamrakar

Rui Zhao

Tamrakar Rakesh

Shanzhi Chen

Shaohui Sun

Xuejuan Gao

Xueming Pan

Ranran Zhang

Deshan Miao

Guojun Xiao

Yu Ding

Hao Ni

Chun Luo

Quibin Gao

Ya'nan Lin

Ya′nan Lin

A CSI feedback method and a CSI feedback device are provided. The CSI feedback method includes: determining a first precoding matrix in a set of first precoding matrices, and determining a first precoding matrix index value corresponding to the first precoding matrix; determining a second precoding matrix in a set of second precoding matrices, and determining a second precoding matrix index value corresponding to the second precoding matrix, the second precoding matrix including a beam selection section for selecting beams from the beam groups for each antenna group and a phase adjustment section for adjusting phases among the plurality of antenna groups; and feeding back the first precoding matrix index value and the second precoding matrix index value to an access device, so as to enable the access device to select corresponding precoding matrices from the set of first precoding matrices and the set of second precoding matrix in accordance with the first precoding matrix index value and the second precoding matrix index value, and implement calculation on the selected precoding matrices to obtain a precoding matrix for data transmission.

Channel state information feedback method and device

A data transmission method and a data transmission device are provided. The data transmission method includes steps of: determining, by a transmitting end, a first precoding matrix and a second precoding matrix, the first precoding matrix being selected from a predefined first codebook, the second precoding matrix being acquired on the basis of CSI; performing, by the transmitting end, precoding processing on a data stream in accordance with the first precoding matrix and the second precoding matrix; and transmitting, by the transmitting end, the data streamed acquired after the precoding processing to a receiving end.

Data transmission method and device

The present disclosure provides a pilot mapping method, a pilot signal transmission method and apparatus, a base station and a terminal. In each PRB of one PRB group, the positions at which a pilot of each antenna port is mapped to resource elements (RE) in the PRB is determined according to an antenna port index and an index of the PRB in the PRB group or the whole system bandwidth, so that support is provided for implementation of power borrowing, so as to make full use of transmit power of a base station end, improve the coverage range of the pilot signal and channel estimation quality of a reception end.

Pilot mapping method, pilot signal transmission method and apparatus, base station and terminal

The present disclosure provides a CSI acquisition method. A network side device indicates a CSI feedback configuration group for aperiodic CSI feedback to a UE, and transmits DCI to the UE, the DCI configured to indicate the UE to perform the aperiodic feedback in accordance with an optimum CSI feedback configuration in the CSI feedback configuration group.

Channel state information acquisition method and device

Disclosed are methods and apparatuses for transmitting coding indication information and determining a pre-coding matrix, for use in resolving the problem that the resolution of code words in a codebook generated by using a combination of a beam vector subgroup and column selection cannot be flexibly adjusted. The method comprises: user equipment determines first pre-coding indication information and second pre-coding indication information, the first pre-coding indication information corresponding to a first-stage pre-coding matrix, the first-stage pre-coding matrix comprising beam vectors in different polarizations, the second pre-coding indication information corresponding to a second-stage pre-coding matrix, the second-stage pre-coding matrix being used for performing amplitude weighting and phase adjusting on all beam vectors in each polarization in the first-stage pre-coding matrix, and the first-stage pre-coding matrix and the second-stage pre-coding matrix being used for generating a pre-coding matrix. Amplitude weighting and phase adjusting are performed on all beam vectors in each polarization in a first-stage pre-coding matrix, so that the resolution of a pre-coding matrix is flexibly adjusted, and the system performance is improved.

Methods and apparatuses for transmitting pre-coding indication information and determining pre-coding matrix

The embodiments of the present disclosure provide a method and a device for constraining a codebook subset. The method includes steps of: determining codebook subset constraint parameters for all or parts of matrix sets for constructing a codebook respectively, each codebook subset constraint parameter indicating an available matrix in a corresponding matrix set; and transmitting the determined codebook subset constraint parameters to a UE. The number of the matrices in each matrix set for constructing the codebook is far less than the number of precoding matrices in the codebook.

Method and device for constraining codebook subset

Disclosed in the present invention are a channel state information (CSI) feedback method, a precoding method, a terminal and a base station. The channel state information (CSI) feedback method disclosed in the present invention comprises: a terminal selects a channel state information-reference signal (CSI-RS) resource or a CSI-RS port on a convention subband from among a CSI-RS resource set as configured in a base station according to downlink channel information; the terminal measures a channel quality indicator (CQI) according to the selected CSI-RS resource or CSI-RS port and a precoding matrix set corresponding to the selected CSI-RS resource or CSI-RS port, wherein the precoding matrix set includes one or more preceding matrices, and a physical resource on the convention subband corresponds to a precoding matrix in the precoding matrix set; and the terminal feeds back the CQI and indication information of the selected CSI-RS resource or CSI-RS port. According to the present invention, the matching degree between CSI and channel state may be improved.

CSI feedback method, precoding method, terminal and base station

Disclosed are channel state information feedback and data transmission method and apparatus. The method comprises: determining a first codebook on a base station side, the first codebook being a set composed of precoding matrixes; determining a first codebook on a terminal side, the first codebook being a set composed of precoding matrixes; calculating channel state information according to the first codebooks; and feeding back the channel state information to a base station. Data transmission is performed on the terminal on the base station side, and in the data transmission process, some or all of the precoding matrixes in the first codebooks are utilized to perform processing, over a resource allocated to a terminal, on data to be transmitted. By using the present application, precoding matrixes needed for open-loop AMMO calculation can be determined, traversing of whole space is avoided, difficulties in system design and implementation are reduced, and the system performance is improved.

Channel state information feedback and data transmission method and apparatus

The present application provides a method and a device for transmitting feedback information. The method includes: determining, by a transmitting terminal, a first code book in accordance with a channel measurement result, precoding matrices included in the first code book being obtained through transformation of a same construction matrix; calculating, by the transmitting terminal, to obtain a first CQI in accordance with all or part of the precoding matrices in the first code book; and transmitting, by the transmitting terminal, first indication information for indicating the first code book and second indication information for indicating the first CQI to a receiving terminal.

Method and device for transmitting feedback information

Disclosed are a channel state information (CSI) feedback method, a precoding method, and an apparatus. In the present invention, a terminal obtains, according to the number of downlink transport layers, a first precoding matrix set that is located on a first subband and that is corresponding to the number of the downlink transport layers, the first precoding matrix set comprising one or more precoding matrices, and a physical resource in the first subband being corresponding to a precoding matrix in the first precoding matrix set; the terminal determines a channel quality indicator (CQI) on a second subband according to downlink channel information and the first precoding matrix set on the first subband; and the terminal feeds back the CSI, the CSI comprising one or more of the following information: an RI used for indicating the number of the downlink transport layers, a PMI used for indicating the first precoding matrix set on the first subband and the CQI on the second subband. The technical solution disclosed in the resent invention can reduce signaling overheads of feeding back CSI by a terminal.

CSI feedback method, precoding method, and apparatus

A channel state information receiving method, a channel state information feedback method, a device, a base station and a terminal are provided. It is related to telecommunication field. The receiving method includes: obtaining group identifiers of groups into which multiple terminals having accessed to a base station are classified; transmitting a triggering signaling to one group of terminals having an identical group identifier; and receiving, on a pre-configured resource block, pieces of channel state information respectively fed back by the group of terminals having the identical group identifier in response to the triggering signaling. With the above technical solution, consumption of downlink signalings of the base station can be reduced and feedback efficiency of channel state information can be improved.

Channel state information receiving method, channel state information feedback method, device, base station and terminal

A reference signal mapping method and a reference signal mapping device are provided. The reference signal mapping method includes steps of: determining a position of a RE to which a CSI-RS has been mapped in accordance with an N-port reference signal pattern, N being equal to 12 or 16; and performing a resource mapping operation on the CSI-RS in accordance with the determined position of the RE. The position of the RE to which the CSI-RS has been mapped in the N-port reference signal pattern being determined in accordance with a position of the RE to which the CSI-RS has been mapped in one or more of a 2-port reference signal pattern, a 4-port reference signal pattern and an 8-port reference signal pattern. As a result, it is able to achieve the 12-port or 16-port CSI-RS mapping, thereby to achieve the 12-port or 16-port CSI-RS transmission.

Reference signal mapping method and device

A method and a device for determining a CSI-RS transmission resource are provided. The method includes: acquiring, by a UE, uplink/downlink subframe configuration information for determining a position of a CSI-RS resource; determining, by the UE, a type of a subframe within which the CSI-RS is to be transmitted in accordance with the uplink/downlink subframe configuration information; and determining, by the UE, the position of the CSI-RS resource within the subframe within which the CSI-RS is to be transmitted in accordance with the determined type of the subframe.

Method and device for determining channel state information-reference signal transmission resource

The disclosure discloses a method and apparatus for feeding back channel state information, and a method and apparatus for transmitting data. The method for feeding back channel state information includes: calculating channel state information according to a first codebook, where the first codebook is a set of elements and each of the elements is a set of pre-coding matrixes; and feeding back the channel state information.

Method and apparatus for feeding back channel state information, and a method and apparatus for transmitting data

The present disclosure provides in some embodiments pilot signal configuration methods and pilot signal configuration devices. The pilot signal configuration method includes steps of: determining configuration information about a pilot signal to be transmitted within a special downlink subframe for a UE; and transmitting the configuration information to the UE. According to some embodiments of the present disclosure, it is able to achieve the configuration of the pilot signal to be transmitted within the special downlink subframe.

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Beijing, China

Wenhong Chen