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A Method and System for Optimizing User Scheduling in Opportunity Interference Alignment

A technology of user scheduling and interference alignment, applied in the field of communication, can solve the problems of incompleteness, large amount of information interaction between base stations, and high precision requirements

Active Publication Date: 2016-07-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional IA technology also suffers from the performance degradation of degrees of freedom (DOF) under low signal-to-noise ratio (SignalNoiseRation, SNR), high accuracy of channel estimation and feedback, large amount of information exchange between base stations, large calculation overhead of CSI, and strict synchronization requirements , difficulties in collaborative operation, etc.
[0003] In addition, the existing user scheduling criterion is proposed using the OIAUS (Opportunistic Interference Aligned User Selection) criterion, and users whose interference signals are mostly aligned are selected. This criterion measures the alignment effect through the correlation of two interference signals. The criterion only considers maximizing the interference-interference correlation, but does not consider the signal-interference correlation, which leads to the incompleteness of this criterion
Especially in low signal-to-noise ratio, only the correlation of interference-interference is considered, and the optimal user cannot be accurately scheduled. Such a scheduling criterion will make the system unstable and reduce the robustness

Method used

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Embodiment 1

[0048] This embodiment provides an optimization method for user scheduling in interference-of-opportunity alignment, and the steps are as follows figure 1 As shown, it specifically includes the following steps:

[0049] Step S1, all base stations broadcast beamforming signals to users to be served respectively.

[0050] Step S2, calculating and obtaining simulation information for measuring the interference alignment effect according to the beamforming signal, and feeding back the simulation information to the first base station.

[0051] Step S3, the first base station determines the best communication user in the first user group according to the simulation information.

[0052] The user scheduling optimization method provided by the above steps can improve the robustness of the user scheduling method in the traditional opportunistic interference alignment technology under low signal-to-noise ratio, and can also change the phenomenon that the total system rate increase decr...

Embodiment 2

[0146] This embodiment provides an optimization system for user scheduling in opportunistic interference alignment, and the composition diagram is as follows Figure 7 As shown, it includes: a broadcast unit 71, a feedback unit 72 and a selection unit 73;

[0147] The broadcast unit 71 is used for all base stations to broadcast beamforming signals to users to be served respectively, all base stations include at least two base stations, each base station is uniquely corresponding to a user group, and one base station is selected from at least two base stations as the first base station, the first The user group corresponding to the base station is the first user group, and the base stations other than the first base station are the second base stations.

[0148] The feedback unit 72 is configured to calculate, according to the beamforming signal, simulated information for measuring an interference alignment effect, and feed back the simulated information to the first base stati...

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Abstract

The invention discloses an optimization method and system for user scheduling in opportunistic interference alignment. The method includes the following steps: all base stations broadcast beamforming signals to users to be served respectively, the base station is uniquely corresponding to the user group, and the user where the user to be served is located The group is the first user group, the base station corresponding to the first user group is the first base station, and the base stations other than the first base station are the second base station; the simulated information used to measure the interference alignment effect is calculated according to the beamforming signal, and The simulation information is fed back to the first base station; the first base station determines the best communication user in the first user group according to the simulation information. Through the user scheduling optimization method provided by the present invention, while ensuring the performance of the user selection system, the robustness of the user scheduling method in the traditional opportunistic interference alignment technology under low signal-to-noise ratio can be improved, and the system can also be changed as the number of users increases. The phenomenon that the overall speed increase is weakened.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an optimization method and system for user scheduling in opportunistic interference alignment. Background technique [0002] Interference Alignment (IA) technology, as a major breakthrough technology in interference management, can effectively combat interference in 4G communication systems. The basic idea of ​​IA technology is to coordinate the transmitter to align the interference signal in a limited subspace at the receiving end through precoding technology, and the receiving end can completely eliminate multi-cell interference through ZeroForcing (ZF) algorithm processing. The traditional IA technology needs to align the interference of multiple cells into the same space, and use the remaining space for interference-free communication, and the signal space must be located in the zero space of the interference space, but this can only be achieved under ideal con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04W72/12H04W74/08
Inventor 王忠勇朱政宇高向川张园园葛伟力张传宗
Owner ZHENGZHOU UNIV