Security Level www huawei com Introduction to Key

Security Level: www. huawei. com Introduction to Key LTE TDD Features: Beamforming Documentation Dept 2014 -01

Introduction to Key LTE TDD Features: Beamforming l Definition l Benefits l Basic principles l Beamforming features and their characteristics l When to use beamforming l How to deploy beamforming Beamforming Feature Parameter Description Page 2

Definition With traffic beamforming, an e. Node. B weights downlink data before transmission to form a narrow beam toward target UEs, thereby increasing the SINR for demodulation and improving CEU experience. Page 3

Gains Offered By Beamforming offers array gains and multiplexing gains. l Array gains indicate an increase in the SINR at the receiver and the improvements of cell coverage. When channel quality is poor, an increase of the array gain indicates that user experience improves. l When channel quality is satisfactory, an e. Node. B uses the same time-frequency resource to process two data streams related to one user or the data streams related to two users, increasing cell throughputs and peak cell capacity. Page 4

Basic principles l In an LTE TDD system, the e. Node. B measures uplink channel quality using Weighting SRSs and estimates the downlink channel characteristics based on channel reciprocity between the uplink and downlink. l Based on the measurement and estimation results, the e. Node. B calculates the weight and then applies it to downlink signals to form a narrow beam toward target UEs. Page 5

Beamforming Features and Their Characteristics Beamforming covers the following features: Characteristics of Beamforming Features Page 6

When to Use Beamforming Adaptive selection between beamforming and MIMO in low-speed scenarios Page 7

How to Deploy Beamforming Feature Parameter Description describes how to deploy beamforming features and adaptation between beamforming and MIMO in the following chapters. Page 8

How to Obtain Beamforming Feature Parameter Description Log in to http: //support. huawei. com, and obtain Beamforming Feature Parameter Description from e. RAN TDD 6. 1 Feature Documentation 01(HDX). Page 9

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