Downlink data transmission method, device and system

A technology of downlink data and transmission method, applied in the field of communication, can solve the problems of increasing equipment complexity and cost, etc.

Inactive Publication Date: 2017-05-03
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] This method can reduce the number of optical fibers required, b

Method used

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  • Downlink data transmission method, device and system
  • Downlink data transmission method, device and system
  • Downlink data transmission method, device and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0156] First, the first device performs beamforming on the data of the scheduled terminal according to the beamforming vector, or performs precoding processing on the data of the scheduled terminal according to the precoding matrix, and performs beamforming or precoding processing on the scheduled terminal Subcarrier mapping is performed on the data of the terminal.

[0157] Among them, the first device performs beamforming on the data of the scheduled terminal according to the beamforming vector, or performs precoding processing on the data of the scheduled terminal according to the precoding matrix, that is, the virtual antenna port-TX / RU in the airspace preprocessing Port mapping.

[0158] In a possible implementation, the first device performs subcarrier mapping on the data of the scheduled terminal after beamforming or precoding processing, that is, the first device maps the data of each scheduled terminal on each TX / RU port according to the scheduling situation. The inf...

specific Embodiment approach

[0204] First, the second device 302 performs first airspace preprocessing on the baseband data of the scheduled terminal, specifically: performing scrambling and modulation on the baseband data of the scheduled terminal;

[0205] The first device 301 performs second airspace preprocessing on the data of the scheduled terminal, specifically:

[0206] Map the data of the scheduled terminal to multiple data layers according to the number of parallel data streams that can be supported, and map the data of the scheduled terminal from the data layer to the reference according to the mapping relationship between the data layer and the reference symbol port The symbol port performs beamforming on the data of the scheduled terminal according to the beamforming vector, or performs precoding processing on the data of the scheduled terminal according to the precoding matrix, and performs beamforming or precoding Subcarrier mapping is performed on the processed data of the scheduled termin...

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PUM

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Abstract

The invention discloses a downlink data transmission method, device and system, and aims at reducing the data transmission burden of a data fronthaul interface. The method comprises that a first device receives data of a scheduled terminal from a second device via the fronthaul interface, and the second device carries out first spatial-domain preprocessing on baseband data of the scheduled terminal to obtain the data of the scheduled terminal; the first device carries out second spatial-domain preprocessing on the data of the scheduled terminal; and the first device converts the data obtained after second spatial-domain preprocessing into an RF signals, and sends the RF signal.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a downlink data transmission method, device and system. Background technique [0002] In view of the important role of MIMO (Multi-Input Multi-Output) technology in improving the peak rate and system spectrum utilization, LTE (Long Term Evolution, long-term evolution) and LTE-A (LTE-Advanced, the evolution of LTE ) and other wireless access technology standards are built on the basis of MIMO combined with OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology. [0003] The performance gain of MIMO technology comes from the spatial freedom obtained by multi-antenna systems. Therefore, one of the most important evolution directions of MIMO technology in the standardization development process is the expansion of dimensions. [0004] In the base station antenna system adopting the traditional PAS (Passive Antenna Syst...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/06H04L1/06
CPCH04B7/0456H04B7/0617H04L1/06H04B7/0473H04B7/0697H04W88/085H04W72/27H04B7/0639H04L1/0606H04L5/001
Inventor 苏昕宋扬李传军
Owner CHINA ACAD OF TELECOMM TECH
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