Samsung LTE-A.pdf

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Uplink/Downlink MIMO June 28, 2011 Juho Lee Samsung Electronics juho95.lee@samsung.com KRnet2011

Table of Contents • LTE-Advanced Downlink MIMO • LTE-Advanced Uplink MIMO • Performance Evaluation • Real Life Deployment Issues 1 KRnet2011

DL MIMO Overall Procedure •PDCCH = Downlink Control •PDSCH = Downlink Data •CQI = Channel Quality Indicator •PMI = Precoding Matrix Indicator •RI = Rank Iindicator •ACK/NACK = feedback for Hybrid ARQ operation 2 KRnet2011

DL Transmission Chain Identity in LTE-Adv MIMO 3 KRnet2011 ScramblingModulation mapperLayermapperScramblingModulation mapperlayerscodewordsPrecodingResource element mapperOFDM signal generationResource element mapperOFDM signal generationantenna portslayers

DL MIMO Overview LTE LTE-Advanced (up to 4 TX antennas) (up to 8 TX antennas) Spatial •Closed-loop codebook based precoding Multiplexing •Open-loop Transmit diversity •SFBC for 2 TX antennas •SFBC+FSTD for 4Tx antennas Closed-loop non-codebook based precoding No additional transmit diversity defined for 8TX antennas (8 physical antennas virtualized to 2 or 4 logical antennas) PMI feedback Yes No Closed-loop Open-loop Set of precodings at transmitter Specified Not specified Codebook based Non-codebook based 4 KRnet2011

DL MIMO with 8 TX Antennas • MIMO with 8 Tx antennas – Peak spectral efficiency up to 30bps/Hz, i.e., 3Gbps @ 100MHz – Reference signal (=pilot) structure to reduce overhead • Common CSI-RS for downlink channel quality measurement – CSI-RS: Channel Status Indicator Reference Signal • Dedicated demodulation RS • Note: in LTE, only common RS is used – Feedback mechanism design • CQI (Channel Quality Indicator) • PMI (Precoding Matrix Indicator) • RI (Rank Indicator) 5 KRnet2011

MU-MIMO with 8 TX Antennas • Up to 8 Tx antennas and mostly 2 Rx antennas at UE • Favorable to MU-MIMO • 8Tx MU-MIMO provides • Both throughput and coverage gain • Cell edge performance gain of up to 150% against 4x2 case with 12 UEs/cell • SU-/MU-MIMO dynamic switching supported Cell edge user throughput Sector throughput 6 KRnet2011 0246810120.050.10.150.20.250.30.350.40.450.55% User Throughput (bps/Hz)# of UEs Baseline-1x2MUBF2x2MUBF4x2MUBF8x2024681012123456789System Throughput (bps/Hz)# of UEs Baseline-1x2MUBF2x2MUBF4x2MUBF8x2

Layer-to-Codeword Mapping •Maximum two codewords are transmitted to reduce the UL ACK/NACK feedback overhead •Multiple layers may be mapped to a single codeword depending on the rank value Number of layers Number of codewords Number of layers per codeword Note 1 2 3 4 5 6 7 8 1 1 2 1 2 1 2 2 2 2 2 1 2 (1, 1) 3 (1, 2) 4 (2,2) (2,3) (3,3) (3,4) (4,4) Only for retransmitted codeword Only for retransmitted codeword Only for retransmitted codeword Added in LTE-Advanced Added in LTE-Advanced Added in LTE-Advanced Added in LTE-Advanced 7 KRnet2011

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