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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 problems such as inability to use IRC receivers, lack of DMRS density information, and inability to know DMRS density

Active Publication Date: 2011-07-13
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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Embodiment Construction

[0060] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0061] figure 1 It is a flowchart of a MU-MIMO transmission method in an embodiment of the present invention, and includes the following steps.

[0062] Step 101: The base station sets up demodulation pilot signal ports for more than one cooperative transmission user terminal performing MU-MIMO transmission.

[0063] Step 102: Map the DMRS symbol and user data of each cooperative transmission user terminal to each resource block according to the total number of DMRS port allocations and the set DMRS port.

[0064] Step 103: Send the DMRS port information of the i-th user terminal among the one or more cooperative transmission user terminals to the i-th user terminal.

[0065] Step 104: The i-th user terminal receives user data and its own DMRS symbol fro...

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Abstract

The invention discloses an MU-MIMO (Multi-User Multi-Input Multi-Output) transmission method. The method comprises the following steps: a base station sets a DMRS (Demodulation Reference Signal) port for more than one cooperative transmission user terminal (UE) which performs MU-MIMO transmission, and maps DMRS symbols and user data of each cooperative transmission user terminal to each resource block RB according to the total distribution number of the DMRS ports and the set DMRS port; DMRS port information of the ith user terminal in the more than one cooperative transmission user terminals is transmitted to the ith user terminal; and the ith user terminal receives the user data and the DMRS symbol of the ith user terminal from each RB according to the DMRS port information of the ith user terminal. The method has better system performance under a condition of not increasing signaling cost of the MU-MIMO.

Description

Technical field [0001] The present 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 the ITU-R, the 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 well improve system performance. In LTE Rel-8, the transmission mode is semi-statically configured through the upper layer 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 Transmission of ≤2, T rank Refers to the number of DMRS ports actually allocated to the UE. With the unfolding of LTE Rel-10, the research on transparent MU-MIM...

Claims

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Application Information

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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
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