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Downlink interference elimination method based on scheduling and interference alignment in heterogeneous cellular network

An interference alignment and cellular network technology, applied in the field of interference management, to eliminate cross-layer interference and same-layer interference, and improve throughput

Active Publication Date: 2014-01-01
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a method for eliminating downlink interference based on scheduling and interference alignment in a heterogeneous cellular network, so as to optimize the transmission link in the heterogeneous cellular network according to the feasibility condition of interference alignment. Perform scheduling and use interference alignment to solve the interference problem between scheduled links

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  • Downlink interference elimination method based on scheduling and interference alignment in heterogeneous cellular network
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  • Downlink interference elimination method based on scheduling and interference alignment in heterogeneous cellular network

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[0033] The present invention will be further described below in conjunction with accompanying drawing.

[0034] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0035] Step 1: All users in the network measure the downlink channel state information CSI from each base station to themselves, and feed back to each base station.

[0036] The channel state information CSI includes path gain g ix and channel matrix Where i=0,1,...,I, 0 represents the macro base station, I is the number of smallcell base stations in the cell, x=1,2,...,X, X is the total number of users in the network, N Ris the number of receiving antennas of the user, N T is the number of transmitting antennas of the base station;

[0037] Step 2: each base station performs downlink transmission link scheduling according to the obtained channel state information CSI.

[0038] 2a) According to the channel state information CSI, the i-th base station looks for the ...

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Abstract

The invention discloses a downlink interference elimination method based on scheduling and interference alignment in a heterogeneous cellular network. The downlink interference elimination method mainly aims to solve the problem of downlink interference in the heterogeneous cellular network, and includes the steps that step 1, channel state information of each base station a user is measured by the user and fed back to each base station; step 2, downlink transmission link scheduling is carried out by each base station according to the channel state information; step 3, a sending beam forming matrix of a base station to be scheduled is constructed by a macro base station and sent to each base station through a backhaul; step 4, data are sent to the user by the base station to be scheduled through the constructed sending beam forming matrix; step 5, the beam forming matrix is received by the user, interference is eliminated, and the data are received. According to the downlink interference elimination method, the link which can achieve the maximum downlink throughout capacity is scheduled for transmission according to interference alignment feasible conditions, mutual interference between links to be scheduled is avoided through the interference alignment, network throughout capacity is improved, and the downlink interference elimination method can be used for heterogeneous cellular network communication.

Description

technical field [0001] The invention belongs to the field of wireless communication, relates to a downlink interference elimination method based on scheduling and interference alignment in heterogeneous cellular networks, and can be used for interference management in heterogeneous cellular networks. Background technique [0002] With the rapid increase of wireless users' demand for mobile services, wireless communication networks need to provide users with ubiquitous high-speed data access services. By deploying small cells, such as microcells, picocells, and femtocells, in hot spots and coverage blind spots in macro cells, the utilization efficiency of spectrum resources can be effectively improved, thereby increasing the capacity of wireless cellular networks. In this heterogeneous cellular network, the same spectrum resources are reused by the microcell and the macrocellular network, which makes the interference problem in the heterogeneous cellular network very serious....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12H04B7/06
Inventor 盛敏刘国庆王玺钧张琰史琰焦万果徐超王亮
Owner XIDIAN UNIV
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