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CSI feedback method and device in FD-MIMO communication

A technology of A-CSI and reference signal, which is applied in the direction of preventing/detecting errors through diversity reception, using return channels for error prevention/detection, space transmission diversity, etc., and can solve problems such as unacceptable air interface overhead

Active Publication Date: 2016-04-27
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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  • CSI feedback method and device in FD-MIMO communication
  • CSI feedback method and device in FD-MIMO communication
  • CSI feedback method and device in FD-MIMO communication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Embodiment 1 is a flowchart of CSI feedback, as attached figure 2 shown. attached figure 2 In , one cell maintained by base station E1 is the serving cell of UEU2. attached figure 2 In , the steps in the box marked by F0 are optional steps, and the steps in the box marked by F1 are optional steps.

[0105] For the base station E1, in step S11, transmit downlink reference signals on the first RS resource and the second RS resource; receive the first PMI in step S12; determine downlink channel parameters in step S13.

[0106] For UEU2, in step S21, the downlink reference signal is received on 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 PMI is fed back.

[0107] In Embodiment 1, the first RS resource includes N1 RS ports, and the second RS resource includes N2 RS ports, and both N1 and N2 are positive integer...

Embodiment 2

[0117] Embodiment 2 is the pattern of the first RS resource and the second RS resource in the PRBP, as shown in the attached image 3 As shown, the RE identified by the number x corresponds to the RS port x, and the two REs on the same subcarrier adjacent to each other in the time domain adopt OCC (Orthogonal Covering Code, Orthogonal Covering Code). attached image 3 In the subframe, the first RS resource and the second RS resource respectively reuse the CSI-RS corresponding to one CSI-RS configuration in LTE-the first RS resource includes RS ports {1, 2, 3, 4, 5, 6 , 7, 8}, the second RS resource includes RS ports {9, 10, 11, 12}. The RS port corresponds to time, frequency and code domain resources of a CSI-RS port in LTE.

Embodiment 3

[0119] Embodiment 3 is a mapping diagram of the 4X4 cross-polarized antenna array configured on the base station side to the RS port, as shown in the 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.

[0120] as attached Figure 4 As shown, the 4 transmit antennas in the first polarization direction of the same row are mapped to the same RS port in the way of antenna virtualization (that is, the 4 transmit antennas respectively transmit the phase-rotated signals of the RS sequence of the same RS port, form a virtual antenna on the receiver 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.

[0121] In Embodiment 3, the base station first sends downlink reference signals to the UE on the first RS resource and the second RS resource; the UE...

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Abstract

The invention provides a CSI feedback method and a CSI feedback device in FD-MIMO communication. The CSI feedback method comprises the steps that: step 1, UE receives downlink reference signals on a first RS resource and a second RS resource; step 2, a target RS resource is determined, and the target RS resource is the first RS resource or the second RS resource; step 3, a first PMI is fed back, and a reference RS of the first PMI is the target RS resource. According to the CSI feedback method, the reference RS of the first PMI is the target RS resource, the first PMI is periodic CSI, a codebook space of the first PMI is a combined codebook, and each codon in the combined codebook corresponds to a unique PMI. By adopting the CSI feedback method and the CSI feedback device provided by the invention, the UE utilizes limited air interface resource to feed back most efficient CI information, saves expenditure of the air interface resource or to improves feedback efficiency of the CSI.

Description

technical field [0001] The present invention relates to a channel information feedback scheme in the technical field of mobile communication, in particular to CSI (ChannelStatusInformation, channel state information) feedback in a mobile communication system that adopts FD (FullDimension, full dimension) MIMO (MultipleInputMultipleOutput, multiple input and output) technology Program. Background technique [0002] In the traditional 3GPP (3rdGenerationPartnerProject, third-generation partnership project) LTE (LongTermEvolution, long-term evolution) system, there are two main ways for CSI feedback of MIMO channels [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) and maps it to implicit CSI. The implicit CSI includes PMI (PrecodingMatr...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/16
CPCH04B7/04H04L1/06
Inventor 张晓博
Owner SHANGHAI LANGBO COMM TECH CO LTD
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