User scheduling method and apparatus for TDD multi-input multi-output down emission system

Abstract

The invention provides a subscriber scheduling method for a time division duplex (TDD) multiple-input multiple-output (MIMO) downlink transmission system and a device thereof, and belongs to the field of communication. The method comprises the following steps: obtaining gain, obtaining a primary service sub-channel and obtaining a secondary service sub-channel, wherein, during the step for obtaining the gain, the effective gain of each of at least two available sub-channels can be obtained according to the channel gain of the at least two available sub-channels of an active subscriber and thecorrelation coefficient between the two available sub-channels; during the step for obtaining the primary service sub-channel, one available sub-channel is selected from the at least two available sub-channels as a service sub-channel according to the effective gain; and during the step for obtaining sub selected serving channel, the effective gain is re-calculated according to the related coefficient between the left available sub-channels and the recently selected service sub-channel. The invention ensures that the dynamic switch between SU-MIMO and MU-MIMO can be performed while the activesubscriber is efficiently scheduled for services.

Description

Technical field The present invention relates to a multiple-input multiple-output downlink transmission system, in particular to a user scheduling method and device of a time-division duplex multiple-input multiple-output downlink transmission system. Background technique MIMO (Multiple Input Multiple Output) systems can be divided into MU-MIMO (Multi-User Multiple Input Multiple Output) systems and SU-MIMO (Single User Multiple Input Multiple Output) systems. In FDD (Frequency Division Duplex, Frequency Division Duplex) system, if the base station adopts precoding transmission, the user needs to feed back CQI (Channel Quality Indicator), downlink channel information, and other necessary information to the base station through the feedback channel. The base station performs user scheduling and precoding processing based on this information, but the feedback channel reduces the spectral efficiency of the channel. How to reduce the amount of feedback information of the FDD system...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a user scheduling method and device for a time-division duplex multiple-input multiple-output downlink transmission system, which comprehensively considers the criteria 1) to 3) to perform user scheduling, and also solves the problem that the prior art cannot efficiently schedule Technical issues of ensuring dynamic switching between SU-MIMO and MU-MIMO while active users are serving

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