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Method, system, terminal device and base station device of multi-point cooperative transmission

A multi-point cooperative, transmission method technology, applied in the direction of transmission modification based on link quality, electrical components, prevention/detection of errors through diversity reception, etc., can solve the adverse effects of time delay No specific solution is given, JT Difficult to play advantages and other issues

Active Publication Date: 2012-12-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of different arrival delays between cells has been deeply studied, but in fact, this problem will actually cause JT's advantages to be difficult to play, and requires focused research and analysis and effective solutions
However, in the current coordinated multi-point solution, no specific solution is given for the adverse effects of the delay problem.

Method used

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  • Method, system, terminal device and base station device of multi-point cooperative transmission
  • Method, system, terminal device and base station device of multi-point cooperative transmission
  • Method, system, terminal device and base station device of multi-point cooperative transmission

Examples

Experimental program
Comparison scheme
Effect test

application example 1

[0123] Such as Figure 5 As shown, for the target terminal, there are 3 cells considered for measurement, and its primary serving cell is Cell#0 (for simplicity, the cell whose cell ID is n is described as Cell#n), and the other measurement cells are Cell #1 and Cell #2. The implementation steps are as follows:

[0124] In the first step, the target terminal performs measurement to obtain the power P from the measurement cell including the main serving cell to the terminal 0 , P 1 , P 2 , and the sum N of interference and noise of cells outside the measurement set 0 , and the time delay t from Cell#1 and Cell#2 to the terminal relative to the main serving cell Cell#0 1 , t 2 ;

[0125] In the second step, the target terminal calculates the feedback coefficient α 0 , α 1 , α 2 ,in Calculate the time delay t 1 , t 2 Corresponding to the quantized index value;

[0126] In the third step, the target terminal will α 0 , α 1 , α 2 And the index value after dela...

application example 2

[0132] The difference from the previous application example is that the main serving cell Cell#0 is selected as the service data transmission point, such as Image 6 As shown, the selected optimal transmission points are Cell#0 and Cell#1, and the main serving cell Cell#0 transmits the control channel to the terminal, and Cell#1 transmits the DM-RS logical port information sent by Cell#0 to the DM-RS RS performs mapping, and Cell#1 performs operations such as modulation, coding, scrambling, frequency domain compensation and mapping on TB1 according to the modulation and coding scheme of TB1 sent by Cell#0, and the terminal CRNTI. For the precoded data S of TB1 1 , the data after frequency domain compensation is The main serving cell Cell#0 transmits TB2, and for the data S precoded by TB2 2 , since it is transmitted by the primary serving cell, no frequency domain compensation is required.

application example 3

[0134] The difference from application example 1 is that the main serving cell Cell#0, Cell#1, and Cell#2 are all selected as service data transmission points, such as Figure 7 As shown, the main serving cell Cell#0 transmits the control channel to the terminal, and the main serving cells Cell#0 and Cell#1 transmit the data of TB1. For the precoded data S of TB1 in the main serving cell 1 , no frequency domain compensation is required; for the TB1 precoded data transmitted by Cell#1, the frequency domain compensated data is Cell#2 transmits TB2 data, for TB2 precoded data S 2 , the data after frequency domain compensation is

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Abstract

The technical problem to be solved by embodiments of the present invention is to provide a coordinated multipoint transmission method, system, terminal device, and base station device. The method comprises: a terminal device performing measurement, and sending a measurement result to a base station; the base station estimating, according to the measurement result sent by the terminal device, a channel quality indication (CQI) value of a data stream transmitted by each measured cell when the measured cell coordinates with other measured cells, and selecting, according to the CQI value of each measured cell, a measured cell coordinating to send service data to the terminal device. The method and system can realize multi-stream coordinated transmission.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a coordinated multi-point transmission method, system, terminal device and base station device. Background technique [0002] In order to improve the throughput rate of the system and solve the interference problem at the cell edge, the long-term evolution advance (LTE-Advance) system considers introducing Coordinated multipoint transmission (CoMP for short), and has launched extensive discuss. [0003] Coordinated multi-point technologies may be classified into two types: joint processing (Joint Process, JP for short), joint scheduling (CS for short), or coordinated beamforming (CB for short). For JP, each node in the cooperative set can obtain data, and JP can be divided into joint transmission (Joint Transmission, referred to as JT) and dynamic cell switching (Dynamic cell switching, referred to as DCS); for CS / CB , the data can only be obtained in the servi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/08H04L1/06
CPCH04L1/0026
Inventor 贺抗生黄双红王文焕刘敏
Owner ZTE CORP