1. On E-MBS with Layered Transmission Document Number: IEEE C80216m/09_0355r1 Date Submitted: 2009-01-12 Source:Debdeep Chatterjee, Furuzan Atay, Jong-Kae (JK) Fwu, Huaning Niu, Hujun Yin Email: jong-kae.fwu@intel.com Venue: IEEE Session #59, San Diego Base Contributions: None Re: 802.16m-08/052, Call for Comments on 802.16m SDD (802.16m-08/003r6), Subject: EMBS Purpose: For TGm discussion and adoption of 802.16m SDD text Notice: This document does not represent the agreed views of the IEEE 802.16 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Layered Transmission (MCW Transmission) using SPC Transmission of two types of frames using superposition coding (SPC) to support hierarchical encoding –Basic frames (B) –Additional frames (A) Both types of frames are MBS frames –B-frames carry “coarse” information –A-frames carry “fine” or “enhanced” information Need to provide a larger coverage for the basic frames –Users with good channels and successive interference cancellation (SIC) receivers may use interference cancellation (IC) to decode the additional frames too. Total system capacity reflected by the sum-throughput for the two kinds of frames

3. System Level Simulation Multi-BS MBS with SFN No HARQ Adaptive MCS to provide: – 95% coverage for the basic frames – 40% coverage for the additional frames Transmission mode: 2-stream spatial multiplexing (SM) mode ISD = 1.5 km Channel Estimation: Ideal

4. System Level Simulation Parameters ParametersValue Number of Cells (3 sectors)19 Bandwidth10 MHz Operating Frequency2500 MHz Minimum Mobile-to-BS Distance35 m Test SectorCentre Cell any sector Sector OrientationBore-Sight Pointing BS Height32 m MS Height1.5 m Propagation ModeleITU PedB Log-Normal Shadowing Standard Deviation8 dB BS Shadowing Correlation2 ISD1500m MS Noise Figure7 dB BS Antenna Gain17 dB CPE Antenna Gain0 dBi

5. System Level Simulation Parameters (2) ParametersValue BS Maximum PA Power46 dBm Frequency Reuse Factor1x3x1 Antenna ConfigurationBS: 2tx, 2rx MS: 1tx, 2rx FFT Size1024 Cyclic Prefix1/8 MS Rx Combining SchemeMMSE, and MMSE-SIC Modulation and CodingQPSK ½, QPSK ¾, 16QAM ½, 16QAM¾, 64QAM ½, 64QAM 2/3, 64QAM ¾, 64QAM 5/6 Fast Fading Model100% PedB 3km/h Cyclic Prefix1/8 Permutation typePUSC Fast Fading Model100% PedB 3km/h BS and SS antenna correlation0.0

6. Geometry distribution for MBSFN with Layered Transmission 100 MS/sector. Power for B-frames 20dB more than that for A-frames 100 MS/sector. Power for B-frames 10dB more than that for A-frames For B-frames, the interference caused by signals corresponding to the A-frames (from all the BSs, including the home-BS) is treated as noise For A-frames, the B-frames are assumed to have been successfully decoded, and the SINR is computed as in a typical SFN scenario The geometry is affected by the power allocation between the two types of frames

7. Throughput Performance “X dB power diff.” = “Power for B-frames is X dB more than that for A-frames”. MCS Adaptation Target: 95% coverage for B-frames and 40% coverage for A-frames at PER of 1%

8. Summary For 1.5km ISD, the overall throughput gain over 2x2 SM with single layer transmission is about 17.7% (for 95% coverage). This assumes –Ideal channel estimation –Optimal power allocation between the two layers –All MSs have SIC receivers

9. Practical Considerations The effect of channel estimation errors (for the case of non-ideal channel estimation) is more pronounced for SIC receivers than for non-SIC receivers Considerably higher receiver complexity required (need to be able to perform SIC) to be able to decode the “enhanced” layer The performance heavily depends on the power allocation between the basic and additional frames, and this would require at least a semi-static adaptation to cope with variations in the large-scale fading The percentage of MSs in the actual system with SIC capability affects the overall coverage performance The throughput gains over 2x2 SM with SCW decreases with ISD. Thus, for real E-MBS systems that may have large ISDs, the throughput gain may not be significant