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Multi-input and multi-output channel adaptation method and device

A multi-output, self-adaptive technology, applied in the field of communication, can solve the problems of inaccurate determination and insufficient utilization of MIMO channel capacity, etc., and achieve the effect of full utilization

Active Publication Date: 2011-11-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for multiple-input multiple-output channel adaptation, which solves the problem of inaccurate determination of the MCS on the codeword when the number of layers of the MIMO channel changes, which leads to insufficient utilization of the MIMO channel capacity

Method used

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  • Multi-input and multi-output channel adaptation method and device

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Experimental program
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Effect test

Embodiment 1

[0058] Under the MIMO channel with 2 transmitting antennas and 2 receiving antennas, the closed-loop MIMO transmission mode is adopted for the user equipment, the RIreport layer of the channel represented by the rank reported by the user equipment recently, where RIreport is 3, and the most recently reported CQIreport is 8 and 5, refer to image 3 .

[0059] Step S1201, the base station receives and stores the RIreport layer of the channel represented by the rank indication reported by the user equipment recently, wherein the RIreport is 3, and each layer is Lr(0), Lr(1) and Lr(2); The number of codewords (or TB blocks) Ncwreport is 2, which are respectively CW(0) and CW(1) (or TB(0) and TB(1)); the channel quality indication CQIreport(0) received and stored by the base station is 8, CQIreport(1) is 5.

[0060] Step S1202, the base station performs adaptive processing on the RIreport to obtain the RIadaptive layer used by the current TTI of the user equipment, where RIadapti...

Embodiment 2

[0067] Under the MIMO channel with 4 transmit antennas and 4 receive antennas, the long-delay CDD transmission mode is adopted for the user equipment, and the RIreport layer of the channel represented by the rank indicator reported by the user equipment recently, where RIreport is 4, and the most recently reported CQIreport is 7, refer to image 3 .

[0068] Step S2201, the base station receives and stores the RIreport layer of the channel represented by the rank indication reported by the user equipment recently, where RIreport is 4, and each layer is Lr(0), Lr(1), Lr(2) and Lr(3) ; The code word (or TB block) number Ncwreport on RIreport is 2, is respectively CW (0) and CW (1) (or TB (0) and TB (1)); The channel quality indicator CQIreport ( 0) is 7, and CQIreport(1) is 7.

[0069] Step S2202, the base station performs adaptive processing on the RIreport to obtain the RIadaptive layer used by the current TTI of the user equipment, where RIadaptive is 2, and each layer is L...

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Abstract

The invention discloses a multi-input and multi-output channel adaptation method and a multi-input and multi-output channel adaptation device. The method comprises that: a base station receives and stores rank indicator (RI) report layers and channel quality indicator (CQI) report of a channel represented by an RI reported by user equipment (UE), wherein RIreport is the number of the RIreport layers; the base station performs adaptive processing on the RIreport to obtain RIadaptive layers used by a current transmission time interval (TTI) of the UE, wherein RIadaptive is the number of the RIadaptive layers; and the base station compares the RIadaptive and the RIreport, computes the spectral efficiency SpecEffa of the RIadaptive layers according to a comparison result and the CQIreport, determines layers corresponding to the RIadaptive layers on codewords according to correspondence between the numbers and the codewords to obtain the spectral efficiency SpecEffa of each layer on the codewords, takes mean values of the spectral efficiency SpecEffa of all the layers on the same codewords as the spectral efficiency on the codewords, and determines modulation and coding schemes (MCS) on the codewords according to the spectral efficiency on the codewords and mapping relationships between the spectral efficiency and the MCSs. In the method and the device, the MCSs of the adapted codewords are determined by the RIreport of the channel represented by the RI reported by the UE and the CQIreport, so the capacity of a multi-input and multi-output (MIMO) channel can be more fully utilized.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for multi-input multi-output channel self-adaptation. Background technique [0002] In a wireless communication system, in order to improve the data transmission rate and system throughput, a multiple-input multiple-output (Multi-Input and Multi-Output, MIMO) technology can be used to obtain the highest data transmission rate of the system The throughput of the system is achieved by transmitting one or more data streams via the MIMO channel to achieve good performance of the system. [0003] There are two main ways to realize MIMO technology: space diversity and space multiplexing. In the LTE system, for the spatial multiplexing mode, the user equipment (User Equipment, UE) needs to feed back the rank of the MIMO channel matrix to the network side, and the network side performs rank adaptive transmission according to the rank reported by the UE. Spati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
CPCH04B7/063H04L1/0003H04L1/0009
Inventor 谭源春彭佛才
Owner ZTE CORP
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