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Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station

A transmission method and multi-input technology, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve problems such as unpaired UEDMRS port information

Active Publication Date: 2011-07-13
NTT DOCOMO INC
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Problems solved by technology

However, in transparent multi-user MIMO, the i-th UE does not have the DMRS port information of the paired UE, so only the maximum ratio combining (MRC) algorithm can be used in decoding

Method used

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  • Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station
  • Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station
  • Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station

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Embodiment Construction

[0074] 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.

[0075] The present invention proposes a specific implementation of non-transparent multi-user MIMO. figure 2 It is a flowchart of MU-MIMO transmission in an embodiment of the present invention.

[0076] On the base station side:

[0077] Step 201: Schedule user terminals 1, 2, and 3 on the same RB. That is to say, these three UEs form a coordinated transmission group, for example, UE2 and UE3 are paired UEs of UE1.

[0078] Step 202: Precoding and superimposing the transmitted data symbols and DMRS symbols of each UE. Specifically: use the precoding vector g1 to precode UE1's x1 / s1, use g2 to precode UE2's x2 / s2, use g3 to precode UE3's x3 / s3, and then superimpose the precoded data .

[0079] Step 203: Generate downlink control signaling (DL contr...

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Abstract

The invention discloses a multi-user multi-input multi-output (MU-MIMO) transmission method and a base station. The method comprises the following steps: the base station configures a demodulation reference signal (DMRS) port for more than one cooperative transmission user equipment (UE) used for MU-MIMO transmission, generates downlink control signaling for ith UE in the more than one cooperative transmission UE, and recods the DMRS port information of the ith UE and the DMRS port information of the UE paired with the ith UE in the downlink control signaling; and the base station frames the precoding data of the more than one cooperative transmission UE and the downlink control signaling and then sends the framed precoding data of the more than one cooperative transmission UE and downlink control signaling to the more than one cooperative transmission UE. The method provided by the invention supports a non-transparent MU-MIMO transmission mode configured by the base station so that the UE has better receiving performance.

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, a wireless communication system and a base station. Background technique [0002] In a wireless communication system, non-transparent multi-user MIMO (non-transparent MU-MIMO) technology is currently a hot technology concerned by standardization organizations (such as 3gpp, WiMAX, etc.). The difference between non-transparent multi-user MIMO and transparent multi-user MIMO is that if any one of a group of cooperative transmission user terminals (UEs) participating in MU-MIMO transmission can know the demodulation pilot signal (DMRS) information of its paired UE , such as the occupied DMRS port (port), port number (rank), etc., it is non-transparent multi-user MIMO; if it cannot be known, it is transparent multi-user MIMO. Wherein, a group of coordinated transmission UEs refers to more than one ...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04B7/06
Inventor 张碧军朱剑驰佘小明陈岚云翔
Owner NTT DOCOMO INC
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