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User access method for large-scale MIMO multi-cell network

An access method and multi-cell technology, applied in access restrictions, radio transmission systems, electrical components, etc., to achieve the effect of reducing pilot pollution

Inactive Publication Date: 2018-05-22
CHINA UNIV OF MINING & TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention proposes a user access method for a massive MIMO multi-cell network to alleviate the pilot pollution problem in a large-scale multiple-input multiple-output (MIMO) multi-cell network

Method used

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  • User access method for large-scale MIMO multi-cell network
  • User access method for large-scale MIMO multi-cell network
  • User access method for large-scale MIMO multi-cell network

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Embodiment

[0152] In order to verify the effect of the present invention, a simulation comparison experiment is carried out.

[0153] Massive MIMO multi-cell innovative user access scheme simulation experiment 1 shows the technical solution of the present invention in N The cumulative distribution function curve that minimizes the uplink interference plus noise ratio (Signal to Interference plus Noise Ratio) for each access user, figure 1 and figure 2 Among them, Random UA Scheme represents a random user access method, Proposed UAScheme represents a user access method proposed by the present invention, and Pilot Reassignment Scheme represents a pilot all reassignment user access method, figure 1 The middle abscissa is the minimum uplink interference plus noise ratio (Signal to Interferenceplus Noise Ratio), and the ordinate is the cumulative distribution (CDF); figure 2 The middle abscissa is the number of base station antennas, and the ordinate is the average uplink rate of users. ...

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Abstract

The invention discloses a user access method for a large-scale MIMO multi-cell network, and a dynamic user access scenario is introduced to alleviate the problem of pilot frequency pollution; considering the mobility of the user, some accessed users have the probability of leaving the network after the pilot frequency is distributed; at this time, the base station can allow a new user to access. The invention provides a novel user access scheme; the fairness degree of user access is measured by utilizing a harmonic progressive signal-to-noise ratio utility function comprising a pilot pollutionitem, the optimal user access problem is converted into a minimization ultra-mode function problem, and for the NP difficulty problem, an ultra-mode user access greedy algorithm is proposed to obtaina suboptimal user access scheme. By means of the user access scheme provided by the invention, pilot pollution between cells can be effectively reduced, and the base station does not need to re-allocate the pilot frequency to all the users.

Description

technical field [0001] The present invention relates to the fifth generation wireless communication technology (5G), in particular to a user access method for a massive MIMO multi-cell network. Background technique [0002] Massive multiple-output multiple-output MIMO (multi-input multi-output) technology is an emerging technology in the fifth generation mobile communication network (5G). Massive MIMO technology can greatly increase spectrum utilization and network capacity. However, in an actual multi-cell massive MIMO network, since the pilot sequence is reused by using orthogonality between multiple cells, the estimated channel state information (CSI, Channel State Information) not only contains the expected channel state information, but also At the same time, interference from adjacent cells is also included, and this interference is called pilot contamination (pilot contamination). Pilot pollution has always been a key issue in massive MIMO technology, even when the ...

Claims

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Application Information

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IPC IPC(8): H04W48/16H04B7/0413
CPCH04B7/0413H04W48/16
Inventor 马帅杜淳张凡贺阳李世银
Owner CHINA UNIV OF MINING & TECH
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