Non-Adaptive Precoding for E-MBS with Macro-Diversity Support (E-MBS) Document Number: IEEE C802.16m-09/1876 Date Submitted: 2009-08-28 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) MediaTek Inc. Venue: IEEE Session #63, Jeju, Korea Re: P802.16m/D1 E-MBS Base Contribution: N/A Purpose: Propose to be discussed and adopted by TGm for the use in Project 802.16m 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/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/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 Problem of fixing MIMO precoding among ABSs, if subchannelization is subband-based CRU If all BSs use identical precoding matrix/vector in a specific subband, spectral holes might happen Users in those holes might have poor signal reception quality

Non-Adaptive Precoding in E-MBS (1/2) Randomization of precoder matrix/vector indices among BSs Reduce spatial holes in SFN Make SFN coverage more complete 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 BS_ID

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

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

Text Proposal 15.3.7.4 MIMO Transmission Schemes for E-MBS …. Non-adaptive precoding for E-MBS without macro-diversity support With MEF=TBD, the matrix W changes every N1 PRUs according to Equation (213). Non-adaptive precoding for E-MBS with macro-diversity support With MEF=TBD, the matrix W changes every N1 PRUs. The PMI of a precoder matrix applied in the sth subband is derived by the following equation: (X) where BSID denotes the base station ID and is the number of subbands.