3D MIMO communication method and apparatus

A reference signal and A-CSI technology, applied in channel estimation, signaling allocation, signaling as a feature, etc., can solve the problem of unacceptable air interface overhead

Active Publication Date: 2016-04-20
SHANGHAI LANGBO COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For FD-MIMO, if the UE directly feeds back the CSI for all physical antennas, the resulting air interface overhead is almost unacceptable when the number of antennas is large

Method used

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  • 3D MIMO communication method and apparatus
  • 3D MIMO communication method and apparatus
  • 3D MIMO communication method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Embodiment 1 is a flowchart of CSI feedback, as attached figure 2 Shown. Attached figure 2 Among them, one cell maintained by the base station N1 is the serving cell of UEU2. Attached figure 2 , The steps in the box identified by F1 are optional steps.

[0101] For the base station N1, in step S11, the downlink reference signal is sent in the first RS resource and the second RS resource; in step S12, the first CI and the first index are received; in step S13, the downlink channel parameters are determined.

[0102] For UEU2, in step S21, the downlink reference signal is received in the first RS resource and the second RS resource; in step S22, the target RS resource is determined, and the target RS resource is the first RS resource or the second RS resource; In step S23, the first CI and the first index are fed back.

[0103] In Embodiment 1, the first RS resource includes N1 RS ports, and the second RS resource includes N2 RS ports, where N1 is a positive integer greater...

Embodiment 2

[0110] Embodiment 2 is the pattern of the first RS resource and the second RS resource in the PRBP, as shown in the appendix image 3 As shown, the RE identified by the number x corresponds to the RS port x-two REs on the same subcarrier adjacent in the time domain adopt OCC (Orthogonal Covering Code). Attached image 3 In, the first RS resource and the second RS resource occupy the CSI-RS resource in LTE, as shown in the appendix image 3 Shown in the square marked by the slash.

[0111] In Embodiment 2, the first RS resource includes RS ports {1, 2, 3, 4}, and the second RS resource includes RS ports {5, 6, 7, 8}. The first RS resource and the second RS resource respectively occupy the time, frequency, and code domain resources of a group of 4 CSI-RS ports in LTE.

Embodiment 3

[0113] Embodiment 3 is the mapping diagram from the 4X4 cross-polarized antenna array configured on the base station side to the RS port, as attached Figure 4 Shown. Attached Figure 4 In, a small square represents a physical antenna, and the number in it represents the RS port index corresponding to the physical antenna.

[0114] As attached Figure 4 As shown, the four transmit antennas in the first polarization direction of the same row are mapped to the same RS port by precoding (that is, the four transmit antennas respectively transmit the signals of the RS sequence of the same RS port after phase rotation, and the UE A virtual antenna is formed on the side). Similarly, the four transmit antennas in the second polarization direction in the same column are mapped to the same RS port in a precoding manner.

[0115] In Embodiment 3, the base station first sends downlink reference signals to the UE in the first RS resource and the second RS resource; the UE then determines the t...

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Abstract

The invention provides a 3D MIMO (Multiple Input Multiple Output) communication method and apparatus. In one embodiment of the 3D MIMO communication method and apparatus, UE (User Equipment) receives a downlink reference signal in a first RS (reference signal) resource and a second RS resource in the step 1; in the step 2, the UE determines a target RS resource which is the first RS resource or the second RS resource; and in the step 3, the UE feeds back a first CI (Codebook Index) and a first index, wherein the first RS resource includes N1 RS ports; the second RS resource includes N2 RS ports; the reference RS of the first CI is the target RS resource; the first index indicates the target RS resource; N1 is a positive integer which is greater than 1; and N2 is a positive integer which is greater than 1. By means of the technical scheme of the 3D MIMO communication method and apparatus, the UE can utilize the limited air interface resource to feed back the most effective CI information so that the cost for the air interface resource is saved or the feedback efficiency of the CI is improved.

Description

Technical field [0001] The present invention relates to a channel information feedback scheme in the field of mobile communication technology, in particular to a downlink channel information feedback scheme in a mobile communication system adopting FD (Full Dimension) MIMO (Multiple Input Multiple Output) technology. Background technique [0002] In the traditional 3GPP (3rdGenerationPartnerProject, third-generation partnership project) LTE (LongTermEvolution, Long Term Evolution) system, there are two main ways to feedback CSI (ChannelStatusInformation, channel status information) of the MIMO channel [0003] ●Feedback implicit CSI [0004] UE (User Equipment) obtains CIR (Channel Impulse Response, channel impulse response) by detecting CRS (Cellspecific Reference Signal) or CSI-RS (CSI Reference Signal, channel state indication reference signal) and maps it to implicit CSI. The implicit CSI includes PMI (Precoding Matrix Indicator, precoding matrix indicator), CQI (Channel Quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L1/00H04L1/06
CPCH04L1/16H04B7/0421H04B7/0469H04B7/0478H04L1/0026H04L5/0053H04L5/0023H04L5/005H04L5/0057H04B7/0417H04B7/0632H04B7/0479H04B7/0452H04B7/0626H04L25/023
Inventor 张晓博
Owner SHANGHAI LANGBO COMM TECH CO LTD
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