Data transmission method and device

A data transmission method and data transmission technology, which are applied in the field of data transmission methods and devices, and can solve the problems of precoding performance degradation, precoding matrix data channel mismatch, etc.

Active Publication Date: 2017-10-24
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] In the scene where the UE moves at high speed, the data channel changes rapidly. When the data channel changes, the phase difference in the second precoding matrix will change. However, the eNB calculates the precoding matrix according to the second precoding matrix and...

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Embodiment Construction

[0289] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0290] In the downlink transmission mode 9 or 10, when the eNB transmits data to the UE, it first transmits the CSI-RS to the UE, and the CSI-RS is used to obtain the channel state information of the data channel; the UE receives the CSI-RS sent by the eNB, and Measure the first precoding matrix and the second precoding matrix according to the CSI-RS, the first precoding matrix is ​​a block diagonal matrix composed of a plurality of column vectors; the second precoding matrix includes columns from the first precoding matrix The indication of the vector selection and the phase difference between the two groups of polarized antennas send the first PMI and the second PMI to the eNB, the first PMI includes the first precoding matrix, and th...

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Abstract

The invention discloses a data transmission method and device, and belongs to the technical field of wireless communication. The data transmission method comprises the steps that an evolved node B (eNB) receives a rank index (RI) and a first precoding matrix index (PMI), which are sent by user equipment (UE), of a data channel, determines a precoding matrix set of data to be transmitted of the UE according to the RI and the PMI, wherein the precoding matrix set comprises a plurality of precoding matrixes; precoding matrixes are selected from the precoding matrix set according to a transmitting order of the data to be transmitted in the frequency domain and time domain, different precoding matrixes in the precoding matrix set are selected when the data to be transmitted is transmitted on the position of at least two resource elements (RE) existing in one resource block (RB) used for transmitting the data to be transmitted; and the data to be transmitted is subjected to weighting processing through the selected precoding matrixes and then transmitted to the UE. The data transmission device comprises a first receiving module, a first determination module, a first selection module and a first transmission module. The data transmission method and device can improve the precoding performance.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data transmission method and device. Background technique [0002] A Multiple Input Multiple Output (MIMO) wireless communication system can obtain diversity and array gain through precoding. Therefore, how to perform data transmission in the MIMO wireless communication system is the focus of the industry. [0003] At present, when the base station transmits data to the user terminal, the base station (Evaluated NodeB, eNB) sends the channel state information reference symbol (Channel State Information Reference Signal, CSI-RS) to the user terminal (Use Equipment, UE), and the UE according to the CSI- The RS obtains the first precoding matrix and the second precoding matrix of the current data channel. The first precoding matrix consists of multiple column vectors, and the second precoding matrix consists of column vectors selected from multiple column ve...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/0413H04B7/06
CPCH04B7/0413H04B7/0486H04B7/0639H04B7/04H04B7/06
Inventor 张瑞齐曲秉玉
Owner HUAWEI TECH CO LTD
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