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3D MIMI transmission method and device

A reference resource and signaling technology, applied in the field of channel state measurement and feedback, downlink channel state measurement and feedback solutions, can solve the problems of large number of physical antennas, unacceptable air interface overhead, and time-frequency resource occupation

Active Publication Date: 2016-03-23
SHANGHAI LANGBO COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of physical antennas in MassiveMIMO (the number of traditional CSI-RS ports is not more than 8), the downlink measurement RS may occupy most of the time-frequency resources in the subframe-and thus cannot satisfy the orthogonality between cells
Furthermore, if the UE directly feeds back the CSI for all physical antennas, the resulting air interface overhead is also unacceptable

Method used

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  • 3D MIMI transmission method and device
  • 3D MIMI transmission method and device
  • 3D MIMI transmission method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Embodiment 1 is a CSI feedback flow chart, as attached figure 2 shown. attached figure 2 In , base station N1 is the serving base station of UEU2. The steps identified in box F1 are optional steps.

[0102] For UEU2, in step S21, the first CSI is sent; in step S21, the second CSI is sent; in step S23, the downlink signal after the precoding operation is received.

[0103] For the base station N1, in step S11, the first CSI is received; in step S12, the second CSI is received; in step S13, the precoded downlink signal is sent.

[0104] In Embodiment 1, the reference resource of the first CSI is the first RS, the first CSI includes the first PMI, and the first RS is broadband; the reference resource of the second CSI is the second RS, and the second CSI includes the second PMI and At least one of the second CQI, the second RS is narrowband. The first RS and the second RS are sent by the same cell, and the cell is maintained by the base station N1. The precoding ma...

Embodiment 2

[0109] Embodiment 2 is a schematic diagram of the time domain positions of the first RS and the second RS, as shown in the attached image 3 shown. attached image 3 In , the squares marked with oblique lines are the subframes in the CSI subframe set to which the first RS belongs, and the squares marked with bold lines are the subframes in the CSI subframe set to which the second RS belongs.

[0110] The CSI subframe set to which the first RS belongs is the first CSI subframe set (composed of squares marked with slashes), and the CSI subframe set to which the second RS belongs is the second CSI subframe set (squares marked with thick lines). composition). The first CSI subframe set and the second CSI subframe set are configured by high layer signaling.

[0111] As a sub-embodiment of Embodiment 2, the first RS is sent on all subframes in the first CSI subframe set, and the second RS is sent on only one subframe in the second CSI subframe set.

[0112] The essence of the ab...

Embodiment 3

[0114] Embodiment 3 is a schematic diagram of the time-frequency position of the second RS, as shown in the attached Figure 4 shown. attached Figure 4 , the squares marked with slashes are PRBP groups, and the squares marked with bold lines are PRBP groups occupied by the second RS.

[0115] The base station first sends the first signaling to indicate L PRBP groups; then, according to the time domain position of the second RS, it is determined that one target PRBP group in the L PRBP groups is the PRBP occupied by the second RS.

[0116] The UE first receives the first signaling to determine L PRBP groups; then determines that one target PRBP group in the L PRBP groups is the PRBP occupied by the second RS according to the time domain position of the second RS.

[0117] In Embodiment 3, the first signaling is high-level signaling, and the L is a positive integer greater than 1. The PRBP group includes a positive integer number of continuous PRBPs in the frequency domain. ...

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Abstract

The invention brings forward a 3D MIMI (Massive Multiple Input Multiple Output) transmission method and device. In the first step, UE sends a first CSI (Channel Status Indicator), and a reference resource of the first CSI is a first RS (Reference Signal). In the second step, the UE sends a second CSI, and a reference resource of the second CSI is a second RS. The first CSI includes a first PMI (Precoding Matrix Indicator), and the first RS is a broadband RS. The second CSI includes at least one of a second PMI and a second CQI (Channel Quality Indicator), the second RS is a narrowband RS, and the first RS and the second RS are sent by the same cell. According to the scheme, the UE estimates the second CSI according to a narrowband measurement RS sent by precoding, the estimation precision of the second CSI is improved, and the air interface cost brought by measuring of the RS is reduced. Moreover, a conventional LTE design is utilized as much as possible, and compatibility with a conventional system is kept to the maximum.

Description

technical field [0001] The present invention relates to a channel state measurement and feedback scheme in the technical field of mobile communication, in particular to a downlink channel state measurement in a mobile communication system using FD (FullDimension, full dimension)-MIMO (MassiveMultipleInputMultipleOutput, large-scale multiple input and output) technology and feedback programs. Background technique [0002] In the traditional 3GPP (3rdGenerationPartnerProject, third-generation partnership project) LTE (LongTermEvolution, long-term evolution) system, there are two main ways for the CSI (ChannelStatusIndicator, channel status indicator) feedback of the downlink MIMO channel [0003] ● Feedback implicit CSI [0004] UE (UserEquipment, user equipment) obtains CIR (ChannelImpulseResponse, channel impulse response) by detecting CRS (CellspecificReferenceSignal, cell-specific reference signal) or CSI-RS (CSIReferenceSignal, channel state indication reference signal) ...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L5/00
Inventor 张晓博
Owner SHANGHAI LANGBO COMM TECH CO LTD
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