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Precoding method and device cooperating with multipoint transmission system

A multi-point transmission and precoding technology, applied in the field of communication, can solve the problems of large loss, interference, and influence on the demodulation of cooperative UEs, so as to ensure the quality of received signals, improve throughput, and reduce interference.

Active Publication Date: 2014-02-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current CoMP precoding generation method generally uses two extreme precoding methods. When the cooperation is performed, the interference of the coordinated UE will be suppressed to zero, and when the cooperation is not performed, the interference to the coordinated UE will not be considered.
The disadvantages of this method are: on the one hand, when performing cooperation, the interference to the coordinated UE is suppressed to zero, but the loss to the coordinated UE is relatively large
On the other hand, when there is no coordination, although there is no loss in the local cell, if the signal direction of the cooperating UE happens to be the direction that interferes the most with the coordinated UE, the coordinated UE will receive particularly large interference at this time, affecting the coordinated UE. Demodulation of cooperative UE

Method used

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  • Precoding method and device cooperating with multipoint transmission system

Examples

Experimental program
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Effect test

Embodiment 1

[0057] This embodiment provides a method for determining a precoding matrix, figure 1 It is a schematic flowchart of a method for generating a precoding matrix of a cooperative UE, specifically including steps 101-104:

[0058] Step 101, the coordinated base station collects the signal precoding information of the cooperating UE and the interference precoding information of the coordinated UE;

[0059] Wherein, the signal precoding information is obtained by matching in the codebook according to a certain principle by using the channel between the UE belonging to the coordinated base station (hereinafter referred to as the coordinated UE) and the coordinated base station (hereinafter referred to as the signal channel). The signal precoding information includes a precoding matrix index (Precoding Matrix Index, PMI for short) and a rank index (Rank Index, RI for short).

[0060] Among them, the interference precoding information is sent from other UEs allocated with the same fr...

Embodiment 2

[0098] This embodiment provides a method for calculating the precoding of the coordinated UE by using the coordinated multi-point transmission technology in the case of two cells. image 3 It is a scenario where coordinated multipoint transmission is adopted in two cells and two UEs in this embodiment. In this embodiment, the base station side uses 4 antennas to send data, and the UE side uses 2 antennas to receive data. UE1 belongs to eNB1, and UE2 belongs to eNB2. UE1 and UE2 are allocated the same frequency resources. UE1 is at the cell edge and is a coordinated UE, UE2 is a coordinated UE, eNB1 is a coordinated base station, and eNB2 is a coordinated base station. The channel between UE1 and eNB2 is H 12 , the channel between UE2 and eNB2 is H 22 . h 12 、H 22 Both are 2x4 matrices. Since the two UEs are allocated the same frequency resources and UE1 is at the cell edge close to eNB2, when eNB2 sends data to UE2, it will affect the data reception of UE1. Therefore,...

Embodiment 3

[0155] This embodiment provides a method for calculating precoding by using the coordinated multi-point transmission technology in the situation of 3 cells and 3 UEs. Figure 4 It is a scenario where coordinated multipoint transmission is adopted in 3 cells and 3 UEs. Wherein, the base station side uses 4 antennas to transmit data, and the UE side uses 2 antennas to receive data. UE1 belongs to eNB1, UE2 belongs to eNB2, and UE3 belongs to eNB3. UE1, UE2 and UE3 are allocated the same frequency resources. Both UE1 and UE2 are at the cell edge and are coordinated UEs, UE3 is a coordinated UE, both eNB1 and eNB2 are coordinated base stations, and eNB3 is a coordinated base station. The channel between eNB3 and UE1 is H 13 , the channel between eNB3 and UE2 is H 23 , the channel between eNB3 and UE3 is H 33 . h 13 、H 23 、H 33 Both are 2x4 matrices. Since the three UEs are allocated the same frequency resources and both UE1 and UE2 are located at the cell edge close to e...

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Abstract

The invention discloses a precoding method and device cooperating with a multipoint transmission system. Signal receiving quality of cooperation UE and cooperated UE is guaranteed. The method includes the steps that a cooperation base station collects signal precoding information of the cooperation UE and interference precoding information of the cooperated UE; the signal precoding information is adopted by the cooperation base station to find precoding matrixes in a codebook, and the precoding matrixes are used as signal vectors; the cooperation base station determines comprehensive interference null space by means of the interference precoding information; the cooperation base station determines the latest precoding matrix of the cooperation UE according to the spatial relationship between the signal vectors and the comprehensive interference null space. The device is located on the cooperation base station and comprises a collecting module, a signal vector obtaining module, an interference null space determining module and a precoding matrix determining module. By the adoption of the method and device, the signal receiving quality of the cooperation UE is guaranteed, interference of the cooperated UE is also reduced, and the signal receiving quality of the cooperated UE is ensured.

Description

technical field [0001] The present invention relates to the communication field, in particular to a precoding method and device for a coordinated multi-point transmission system. Background technique [0002] As the standard of the fourth generation communication system (4G), International Mobile Telecommunications Advanced (IMT-Advanced) puts forward higher requirements for system performance, especially for uplink and downlink frequency efficiency. Coordinated multi-point transmission / reception (CoMP) is a technology that improves high-speed transmission coverage, cell edge service quality and throughput, and system throughput, and has become an important technology for improving system spectrum utilization. , and thus has received extensive attention. The so-called coordinated multi-point transmission means that multiple base stations coordinate transmission to serve one or more user equipments (User Equipment, UE for short). CoMP defined by 3GPP includes two scenarios,...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 柳叶
Owner ZTE CORP
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