System Level Performance of 8TX Measurement Pilot IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-09/0808 Date Submitted:

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System Level Performance of 8TX Measurement Pilot IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-09/0808 Date Submitted: Source: Jiann-An Tsai Jerry Pi, Bruno Clerckx David Mazzarese Samsung Electronics Venue: Re : TGm Call for Contributions and Comments on AWD and SDD for Session 61 Base Contribution: None Purpose: To discuss and adopt the proposed text in the revision of the m AWD and SDD Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and. 1

Background In the contribution, we evaluate the MU-MIMO system-level performance for 8TX measurement pilot MU-MIMO is evaluated using 4-bit rank-1 codebook in current AWD Three schemes are considered: – No interlaced measurement pilot pattern + fixed subframe transmission – Interlaced measurement pilot pattern only – Interlaced measurement pilot + non-fixed subframe transmission 2

Parameter Assumption Cellular LayoutHexagonal grid, 19 cell sites, 3 sectors per site Inter-site distance500m Distance-dependent path lossL=I log 10 (.R), R in kilometers I=128.1 – 2GHz, I= MHz [5] Shadowing standard deviation8 dB Correlation distance of Shadowing50 m Penetration Loss20dB Antenna pattern [4] (horizontal) (For 3-sector cell sites with fixed antenna patterns) = 70 degrees, A m = 20 dB Carrier Frequency / Bandwidth2GHz Channel modelSpatial Channel Model (SCM) simulations UE speeds of interest3km/h, Total BS TX power (Ptotal) 46dBm - 10MHz carrier Users dropped uniformly in entire cell Minimum distance between UE and cell>= 35 meters Base Station Simulation Parameters

4 System Simulation Parameters ParametersAssumptions OFDM parameters10 MHz (1024 subcarriers) Permutation / ChannelizationLocalized Number of total RU in one subframe48 Number of RU for PMI and CQI calculation4 CQI, PMI feedback periodEvery 1 frame (5ms) Full Sub-band feedback PMI Based on common pilot/midamble MIMO ModeMU-MIMO (8TX) MCS levels16 MCS level-QPSK, QAM16, QAM64 MIMO receiverLMMSE ChannelSCM-Urban Macro-15 degree Angle Spread 0.5 Data Channel EstimationIdeal channel estimation HARQ RetransmissionIR Combining, Maximum 4 re-transmissions. SchedulingProportional Fair

Summary – System-level MIMO simulation results show that the schemes of interlaced pattern and non-fixed subframe transmission provide system performance benefit over the case with interlaced and fixed subframe transmission 5

6 User Throughput

7 Sector/Cell Edge Throughput bps/HzNo Interlaced +Fixed subframe Interlaced OnlyInterlaced + Non- fixed subframe Cell Edge Throughput Sector Throughput