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Method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by PDSCH (Physical Downlink Shared Channel)

A transmission method and precoding technology, applied in the field of LTE communication, to achieve the effect of improving the effect of precoding

Inactive Publication Date: 2016-08-03
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above-mentioned two-dimensional antenna array situation, the base station not only needs to transmit the CSI-RS of the horizontal dimension, but also needs to transmit the CSI-RS of the vertical dimension. Obviously, RE resources have not been configured for the CSI-RS of the vertical dimension in the prior art.

Method used

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  • Method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by PDSCH (Physical Downlink Shared Channel)
  • Method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by PDSCH (Physical Downlink Shared Channel)
  • Method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by PDSCH (Physical Downlink Shared Channel)

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Embodiment 1

[0023] This embodiment describes the CSI-RS transmission method when the PDSCH performs two-dimensional precoding, and the steps are as follows figure 2 As shown, specifically:

[0024] 1. The base station notifies the UE of the CSI-RS in the horizontal dimension and the CSI-RS port number in the vertical dimension;

[0025] 2. The base station precodes the CSI-RS in the horizontal dimension, and the precoding matrix used is the same as the precoding matrix used in the vertical dimension of the current PDSCH channel;

[0026] 3. The base station sends the CSI-RS in the vertical dimension and the horizontal dimension on the RE resource corresponding to the CSI-RS port number;

[0027] 4. The UE receives the CSI-RS in the vertical dimension and the horizontal dimension on the RE resource corresponding to the CSI-RS port number;

[0028] 5. The UE obtains the channel state information of the vertical dimension and the horizontal dimension by estimating the information of the C...

Embodiment 2

[0035]In step 3 of Embodiment 1, the base station needs to transmit the CSI-RS of the vertical dimension and the horizontal dimension on the RE resource corresponding to the CSI-RS port number. In practical applications, the RE resource configuration of the CSI-RS of the vertical dimension and the horizontal dimension can be There are many schemes, and this embodiment specifically describes one of the configuration schemes. In order not to affect the resource mapping of the CSI-RS in the horizontal dimension configured in the existing LTE system, this embodiment adopts a method of additionally configuring new RE resources for the CSI-RS in the vertical dimension. Suppose there are 12 CSI-RS ports in total, including 8 CSI-RS ports in the horizontal dimension (port numbers are marked as 0-7), and 4 CSI-RS ports in the vertical dimension (port numbers are marked as 8-11), Then the RE resource mapping of these ports is as follows image 3 As shown, the CSI-RS ports in the horizo...

Embodiment 3

[0037] The difference between this embodiment and Embodiment 2 lies in that this embodiment adopts a method of configuring existing RE resources for CSI-RSs in the vertical dimension. The RE resource mapping of 12 CSI-RS ports is as follows Figure 4 As shown, the number of configuration sets of CSI-RS ports in the horizontal dimension is reduced, and only 4 sets of configurations of the original LTE system are used. The 8 RE resources in the remaining 1 set of configurations are divided into 2 sets and allocated to the CSI-RS ports in the vertical dimension. , since the 2 sets of resources in the vertical dimension are included in the original 5 sets of resources in the horizontal dimension, there is no need to add new RE resources in this embodiment.

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Abstract

The invention provides a method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by a PDSCH (Physical Downlink Shared Channel). The method comprises the step that a base station sends CSI-RSs at the horizontal dimension and CSI-RSs at the vertical dimension to UE (User Equipment), wherein the CSI-RSs at the horizontal dimension are subjected to precoding in advance, and the precoding adopts a precoding matrix at the vertical dimension of the current PDSCH. The method provided by the invention can greatly improve precoding effects at the horizontal dimension of the PDSCH.

Description

technical field [0001] The present invention relates to the field of LTE communication, in particular to a method for sending CSI-RS under the condition of two-dimensional precoding of PDSCH. Background technique [0002] The Long-Term Evolution advanced system (LTE-Advance for short) defines two pilot frequencies, namely, Channel State Information-Reference Signals (CSI-RS for short) and Demodulation Reference Signals (DMRS for short). The current LTE system adopts a one-dimensional antenna structure. The base station sends CSI-RS at the CSI-RS port. After receiving the CSI-RS, the UE can obtain channel state information in the horizontal dimension according to the channel estimation result and feed it back to the base station. When the physical shared channel (PDSCH, PhysicalDownlinkSharedChannel) performs the precoding operation of the horizontal dimension, the channel state information fed back by the UE includes channel quality indication (CQI, ChannelQualityIndication)...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00
Inventor 周欢孙鹏
Owner BEIJING XINWEI TELECOM TECH
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