LTE Parameter - AMC

MIMO Mode Control

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Overview • Main contribution to high spectral efficiency • MIMO is the deployment of multiple antennas at Tx and Rx • 3GPP defines 7 DL transmission tr ansmission modes • RL30 allows for DL: - Transmission

on single antenna port (SISO/SIMO) - TX diversity (2x2)











Overview

MIMO

Data Transmission

Number of Antennas

Number of Users

Pre-Coding

SISO

SU-MIMO

(beamforming) single data stream sent over multiple input antennas

(Single Input Single Output)

(Single User MIMO)

X

g n i d o c e r p

MISO …

(Multiple Input Single Output)

…











Multiple-Input Multiple-Output MIMO Principle (1/2) Signal from jth Tx antenna

Sj

T1

R1

T2

R2

•

•

MIMO

Input

Processor

Output











MIMO Principle (2/2) Signal from jth Tx antenna

Signal at ith Rx antenna

h1,1

Sj

T1

hn,1 h1,2

h2,1

Yi h1,m

R1

h2,2

Input

T2

• •

hn,2

h2,m

MIMO

R2

• •

Processor

Output













3GPP Rel8 Transmission Modes (1/2)











3GPP Rel8 Transmission Modes (2/2)











RL30 supported transmission modes (DL)











Overview





























































































Dynamic Open loop MIMO Depending on Radio Conditions: switch between Transmit Diversity and Spatial Multiplexing M IMO Switch Algorithm - Open loop MIMO - Open loop adaptive MIMO Algorithm - Support of UE Capabilities - UE basis - CQI and Rank Information: used as switching criteria











Dynamic MIMO mode











Dynamic (Adaptive) OL Switching 5arious parameters are to support adaptive swit%'ing $etween 1-stream Transmit Diversity and 2-stream Spatial Multiplexing: +6I T'res'ol T'res'old d • mimoOlCqiThD  T'is de#ines t'e +6I #or #all$a%& to !pen ,oop MIM! diversity 7in +6I8.

• mimoOlCqiThU  T'is de#ines t'e +6I +6I T'res'old T'res'old #or a%tivation o# !pen ,oop MIM! Spatial +6I8. Ran& T'res'old T'res'old • mimoOlRiThD  T'is de#ines t'e Ran& #or #all$a%& to !pen ,oop MIM! diversity.

Downgrade Switch:: If mimoCQI <= mimoDivCqiThDownOL or

Multiple"ing 7in

mimoRANK <= mimoDivRiThDownOL Upgrade Switch : If mimoCQI > mimoSmCqiThUpOL











Dynamic Open Loop MIMO mode

CQI

SM

SM

mimoOlCqiThU mimoOlCqiThD

Time























MIMO Adaptive Closed Loop











Dynamic (Adaptive) CL Switching











Dynamic Close Loop MIMO mode





















Parameters Summary



































LTE Parameter - AMC

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