Inter-cell interference coordination method adopting three-dimensional beam forming in 3D-MIMO (three dimensional multiple-input multiple-output) system

A 3D-MIMO and 1.3D-MIMO technology, applied in the field of multi-cell interference coordination, can solve the problem that the interference coordination strategy cannot be applied to the 3D-MIMO system

Active Publication Date: 2015-07-15
XI AN JIAOTONG UNIV
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Problems solved by technology

Therefore, the previous interference coordination strategy cannot be applied to the new 3D-MIMO system at all. A new interference coordination method should be formulated according to the characteristics of the system, especially using the three-dimensional spatial distribution characteristics of users to reduce interference between users through additional spatial degrees of freedom.

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  • Inter-cell interference coordination method adopting three-dimensional beam forming in 3D-MIMO (three dimensional multiple-input multiple-output) system
  • Inter-cell interference coordination method adopting three-dimensional beam forming in 3D-MIMO (three dimensional multiple-input multiple-output) system
  • Inter-cell interference coordination method adopting three-dimensional beam forming in 3D-MIMO (three dimensional multiple-input multiple-output) system

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[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] figure 1 Indicates the cell topology structure of the scene where the 3D-MIMO system is located, and the specific description is as follows:

[0040] In the traditional cellular hexagonal cell structure, the base station is located in the center of each hexagonal cell, and the hexagonal cell will be divided into three diamond-shaped sectors, and the three sectors are served by directional antennas at intervals of 120° . In the cell topology of the 3D-MIMO system, each cell is a hexagon, the base station is located on the common vertices of the three cells, and each group of directional antennas serves a hexagonal cell, such as figure 1 As shown, the direction of the arrow is the main radiation direction of the antenna. Since the cell topology differs greatly from the previous interference coordination scheme, a corresponding new interference c...

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Abstract

The invention discloses an inter-cell interference coordination method adopting three-dimensional beam forming in a 3D-MIMO (three dimensional multiple-input multiple-output) system. Different types of users distributed in three-dimensional space are dispatched in different time slots, meanwhile, a three-dimensional beam forming transmission technique is used, and inter-cell same-frequency interference borne by the users is greatly reduced. The inter-cell interference coordination method comprises the following steps: (1) an apex angle from each base station to a direct-sight path of each user is calculated according to the distribution of the users in the three-dimensional space, and the users are separated into high-riser users and low-riser users accordingly; (2) the low-riser users are separated into cell edge users and cell center users according to the plane positions of the users in a cell; (3) the time slots of the dispatched users are divided into three kinds, the same kind of users are dispatched by all the base stations in each kind of time slots, the three-dimensional beam forming transmission technique is used to serve the users, power of useful signals received by the users is further increased, and interference is reduced. The inter-cell interference coordination method greatly improves the service quality of the cell edge users while improving the overall network throughput capacity.

Description

Technical field: [0001] The invention belongs to the field of wireless communication, and in particular relates to a multi-cell interference coordination method using three-dimensional beamforming in a cellular network multi-cell multi-user 3D-MIMO system. Background technique: [0002] In recent years, the amount of data required by smart mobile devices is far greater than before, so 3GPP (3rd Generation Partnership Project) is committed to researching cutting-edge technologies in its standards to improve spectrum efficiency and user experience. Three dimensional Multiple-Input Multiple-Output (3D-MIMO) is one of the key technologies currently being researched by 3GPP in the next generation Long Term Evolution (LTE) wireless communication system. 3D-MIMO does not require large-capacity backhaul links and more spectrum resources. It uses a large number of antennas arranged in a spatial antenna array for three-dimensional beamforming signal transmission, which greatly improve...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08H04W16/14H04W74/06
Inventor 任品毅张逸炎孙黎
Owner XI AN JIAOTONG UNIV
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