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A downlink coordinated multi-point transmission method and system

A technology of multi-point transmission and cooperative reception, applied in the field of communication, can solve problems such as undiscovered, and achieve the effects of reducing interference power, improving system performance, and improving signal-to-noise ratio

Inactive Publication Date: 2017-10-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the existing technology, a better solution to this problem has not been found

Method used

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  • A downlink coordinated multi-point transmission method and system
  • A downlink coordinated multi-point transmission method and system
  • A downlink coordinated multi-point transmission method and system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0056] figure 2 It is a schematic diagram of the interference elimination method between co-sited cells in the present invention; in this embodiment:

[0057] Cells 1, 2, and 3 are located on the same base station site, and information exchange between cells can be performed directly without the need to exchange information through a BackHaul (backhaul) link between cells.

[0058] For UE1, UE2 and UE3, their serving cells are cell 1, cell 2 and cell 3 respectively. When cell 2 serves UE2, the cooperative cells are cell 1 and cell 3, that is, UE2 is the target receiving end, UE1 and UE3 are respectively the cooperative receiving end, the base station of cell 2 is the serving transmitting end, and the base stations of cell 1 and cell 3 are Its cooperative transmitter.

[0059] Each UE feeds back the optimal PMI to its serving cell. For example, UE1, UE2, and UE3 feed back PMI1, PMI2, and PMI3 to cell 1, cell 2, and cell 3 respectively, and the corresponding precoding vectors...

Embodiment 2

[0076] image 3 It is a schematic diagram of an interference elimination method between different site cells in the present invention; in this embodiment:

[0077] Cells 1, 2, and 3 are located on the same base station site, and information exchange between cells can be performed directly without BackHaul.

[0078] The base station sites of cell 7 and cell 1 are different, and information exchange between cells needs to pass BackHaul.

[0079] For UE1, UE2, UE3 and UE7, their serving cells are cell 1, cell 2, cell 3 and cell 7 respectively. When cell 2 serves UE2, the coordinated cells are cell 1, cell 3 and cell 7.

[0080] Each UE feeds back the optimal PMI to its serving cell. For example, UE1, UE2, UE3, and UE7 feed back PMI1, PMI2, PMI3, and PMI7 to cell 1, cell 2, cell 3, and cell 7 respectively. The encoding vectors are: W PMI1 , W PMI2 , W PMI3 and W PMI7 .

[0081] Taking cell 2 serving UE2 as an example, in order to improve the receiving performance of UE2, i...

Embodiment 3

[0100] Figure 4 It is a schematic diagram of another method for eliminating interference between co-located cells in the present invention;

[0101] In this embodiment: cells 1, 2, and 3 are located on the same base station site, and information exchange between cells can be directly performed without BackHaul.

[0102] For UE1, UE2 and UE3, their serving cells are cell 1, cell 2 and cell 3 respectively. When cell 2 serves UE2, the coordinated cells are cell 1 and cell 3.

[0103] Each UE feeds back the optimal PMI to its serving cell. For example, UE1, UE2, and UE3 feed back PMI1, PMI2, and PMI3 to cell 1, cell 2, and cell 3 respectively, and the corresponding precoding vectors are: W PMI1 , W PMI2 and W PMI3 .

[0104] Taking cell 2 serving UE2 as an example, in order to improve the receiving performance of UE2, it is hoped to improve its receiving signal-to-noise ratio, the general CB method, as introduced in the background technology, UE2 will select a new precoding ...

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Abstract

The present invention provides a downlink coordinated multi-point transmission method, which is applied to a system including a service transmitter and multiple cooperative transmitters, including: when multiple coordinated transmitters of a target receiver send data to their respective coordinated receivers, the precoding used The vector is obtained by adjusting the precoding vector corresponding to the optimal precoding vector index fed back by the cooperative receiving end of each cooperative transmitting end, and the power or amplitude of the signals of multiple cooperative transmitting ends after being superimposed on the target receiving end is smaller than that of multiple Power or amplitude of signals superimposed at the target receiving end when the precoding vector of the cooperative transmitting end is not adjusted, and the adjustment includes phase adjustment. The invention also provides a coordinated multi-point transmission system. The invention realizes the interference cancellation among multiple interference vectors by adjusting the phase of the interference vector, or the phase and amplitude, and improves the signal-to-noise ratio of the received signal.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and system for Coordinated Multiple Point (Coordinated Multiple Point, CoMP) transmission in a Multiple-Input Multiple-Output (MIMO) system. Background technique [0002] With the rapid development of wireless communication technology, severely insufficient spectrum resources have gradually become the main factor restricting the development of wireless communication. How to make full use of limited spectrum resources and improve spectrum utilization is a major problem in wireless communication. MIMO technology is widely favored because it can improve transmission efficiency and spectrum utilization without increasing bandwidth. MIMO technology obtains space diversity gain through transmitting and receiving diversity, obtains antenna array gain through beamforming technology, and obtains space multiplexing gain through space multiplexing technology. Specifically, to obt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04B7/08
Inventor 关艳峰陈宪明鲁照华
Owner ZTE CORP
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