PP R1-074852. November 2007. Additional RSRP reporting trigger for ICIC. © 2009 by Taylor & Francis Group, LLC Chapter 5 MIMO OFDM Schemes for 3GPP LTE Gang Wu and Xun Fan Contents Introduction 5.2 SU-MIMO 5.2.1 Layer Mapping for Spatial Multiplexing 5.2.2 Layer Mapping for Transmit Diversity 5.2.3 Precoding 5.2.3.1 Precoding for Transmission on a Single Antenna Port 5.2.3.2 Precoding for Spatial Multiplexing 5.2.3.3 Precoding for Zero- and Small-Delay CDD 5.2.3.4 Precoding for Large-Delay CDD 5.2.3.5 Codebook for Precoding 5.2.3.6 Precoding for Transmit Diversity 5.3 MU-MIMO Physical Channel Procedures Supporting MIMO 5.4.1 UE Procedure for Reporting Channel Quality Indication, Precoding Matrix Indicator, and Rank 5.4.2 Aperiodic/Periodic CQI Reporting Using PUSCH 5.4.3 Periodic CQI Reporting Using PUCCH Summary References © 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3GPP LTE Radio and Cellular Technology 5.1 Introduction Multiple-input, multiple-output (MIMO) techniques have been integrated as one of the key approaches to provide the peak data rate, average throughput, and sys- tem performance in 3rd Generation Partnership Project (3GPP) long term evolu- tion (LTE). Based on the function of the multiple transmission symbol streams in MIMO, the operation mode of multiple transmit antennas at the cell site (denoted as MIMO mode) have spatial division multiplexing (SDM), precoding, and trans- mit diversity (TD). Base on the allocation of the multiple transmission streams in MIMO, the MIMO mode is denoted as single user (SU)-MIMO if the multiple transmission symbol stream is solely assigned to a single UE and multiuser (MU)- MIMO if the SDM of the modulation symbol streams for different UEs use the same time-frequency resource [1]. The LTE downlink is an orthogonal frequency division multiplexing (OFDM) system, SO the MIMO modes proposed in LTE are MIMO OFDM schemes. In 3GPP LTE, the MIMO mode is restricted by the UE capability (e.g., num- ber of receive antennas) and is determined by taking into acco