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MU-MIMO (Multi-User Multi-Input Multi-Output) transmission method

A transmission method and multi-input technology, applied in the field of multi-user multi-input multi-output transmission, can solve the problems of not knowing the channel information, not knowing whether there is a paired UE, not knowing the DMRS density, etc.

Active Publication Date: 2015-04-08
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in transparent MU-MIMO, the i-th UE cannot know the channel information, and even does not know whether there is a paired UE, so the IRC receiver cannot be used
[0012] (2) Lack of DMRS density information
However, when the number of ports occupied by a certain UE is not greater than 2, the UE cannot know the DMRS density

Method used

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  • MU-MIMO (Multi-User Multi-Input Multi-Output) transmission method

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Embodiment Construction

[0057] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0058] figure 1 It is a flowchart of a method for MU-MIMO transmission in an embodiment of the present invention, including the following steps.

[0059] Step 101: The base station sets demodulation pilot signal ports for more than one user terminal that performs MU-MIMO transmission in cooperative transmission.

[0060] Step 102: Map the DMRS symbols and user data of each coordinated transmission user terminal to each resource block according to the total number of allocated DMRS ports and the set DMRS ports.

[0061] Step 103: Send the DMRS port information of the i-th user terminal among the one or more coordinated transmission user terminals to the i-th user terminal.

[0062] Step 104: The i-th user terminal receives user data and its own DMRS sy...

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Abstract

Embodiments of the present invention provide a method and system for MU-MIMO transmission. The method includes: configuring, by a base station, Demodulation Reference Signal (DMRS) ports for coordinated transmission UEs performing an MU-MIMO transmission, and mapping DMRS symbols and user data of each coordinated transmission UE to each Resource Block (RB) according to the total number of allocated DMRS ports and configurations of the configured DMRS ports; transmitting DMRS port information of the i th UE of the coordinated transmission UEs to the i th UE; and receiving, by the i th UE, the user data and the DMRS symbols o fthe i th UE from each RB according to the DMRS port information of the i th UE. The method and system provided by the present invention can achieve a better system performance without increasing signaling overhead of MU-MIMO.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a multi-user multiple-input multiple-output (MU-MIMO) transmission method. Background technique [0002] According to the evaluation results of International Mobile Telecommunications Advanced (IMT-A) obtained by ITU Radiocommunication Sector (ITU-R), single-cell enhanced multi-user multiple-input multiple-output (Multi-User MIMO , MU-MIMO) has been regarded as an important technology of LTE-A, because this technology can improve the system performance well. In LTE Rel-8, the semi-static configuration of the transmission mode is performed by the upper layers to support Single-User MIMO (Single-User MIMO, SU-MIMO) and MU-MIMO. In LTE Rel-9, the concept of transparent MU-MIMO is proposed, and it can support the total number of DMRS port allocation T rank ≤2 transmission, T rank It refers to the number of DMRS ports actually allocated to the UE. With the development of LTE Re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/06
CPCH04L5/003H04B7/0452
Inventor 朱剑驰云翔张碧军佘小明陈岚
Owner NTT DOCOMO INC