NonAdaptive Precoding for EMBS with MacroDiversity Support EMBS

Non-Adaptive Precoding for E-MBS with Macro-Diversity Support (E-MBS) Document Number: IEEE C 802. 16 m-09/1876 r 1 Date Submitted: 2009 -09 -20 Source: Chih-Yuan Lin (chihyuan. lin@mediatek. com), Pei-Kai Liao (pk. liao@mediatek. com ), Yu-Hao Chang (yuhao. chang@mediatek. com), and Paul Cheng (paul. cheng@mediatek. com) Media. Tek Inc. Venue: IEEE Session #63. 5, Hawaii, US Re: P 802. 16 m/D 1 E-MBS Base Contribution: N/A Purpose: Propose to be discussed and adopted by TGm for the use in Project 802. 16 m AWD 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: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

Background (1/1) ▪ SFN-based E-MBS – All neighboring BSs use same configuration • MCS level, MIMO configuration, and other system parameters • Subchannelization for E-MBS is not determined • Only unicast OL SU-MIMO scheme is defined ▪ Possible to further improve system performance, if subchannelization is subband-based CRU ▪ Randomization of precoder matrix/vector indices among BSs – Leverage more diversity gain – Make SFN coverage more complete

Non-Adaptive Precoding in E-MBS (1/2) ▪ Two-dimensional open-loop precoding assignment – Frequency-domain • Each BS changes precoding indices in frequency domain – BS-domain • Do cyclic shift operation on precoding indices of a base BS for other neighboring BSs – Precoding indices of neighboring BSs in a specific band are maximally kept different • Can base on Cell_ID

Non-Adaptive Precoding in E-MBS (2/2) ▪ Pseudo-random precoder matrices/vectors allocation in SFN-based E-MBS BS 0 BS 1 BS 2 BS 3 PMI #0 PMI #3 PMI #2 PMI #1 PMI #0 PMI #3 PMI #2 PMI #1 PMI #0

Simulation Results (1/3) ▪ Simulation parameters Channel model IMT-A UMa-n. LOS (0. 5 TX ant. sp. ) 30 km/hr System configuration Single-frequency network Bandwidth 10 MHz Number of cells and number of sectors per cell 19 / 3 Number of users per sector 30 (uniformly distributed) Sub-band based CRU Subchannelization Case 1: no subcarrier permutation Case 2: data is evenly distributed across all CRU Multi-antenna configuration # of BS antennas: 4 # of MS antennas: 2 Receiver type MMSE Scheduling Proportional Fair

Simulation Results (2/3) ▪ System level simulation – 2 -stream case – Case 1: no subcarrier permutation 0. 2~0. 4 d. B performance gain

Simulation Results (3/3) ▪ System level simulation – 2 -stream case – Case 2: data is evenly distributed across all subband CRU resources 0. 1~0. 3 d. B performance gain

Conclusion (1/1) ▪ Two-dimensional OL precoder randomization – Provide additional diversity over different resource blocks of different BSs in SFN ▪ No signaling overhead is induced

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