Discussion on Technologies for E-MBS Document Number: IEEE S802.16m-08/1134 Date Submitted: 2008-9-15 Source: Wang Yonggang, Chao Hua, Chen Yu, Wang He,

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Discussion on Technologies for E-MBS Document Number: IEEE S802.16m-08/1134 Date Submitted: Source: Wang Yonggang, Chao Hua, Chen Yu, Wang He, Zhang Bijun, Voice: Ext 7796 Li Ji, Yang Yuli, Hu Zhongji, Yang Hongwei Alcatel Shanghai Bell Co., Ltd. * Venue: IEEE m-08/033: Call for Contributions and Comments on Project m System Description Document (SDD) Contributions on topic: “PHY aspects of enhanced MBS” Base Contribution: IEEE C802.16m-08/1134 Purpose: For m discussion, adoption into the SDD and eventual adoption for standardization 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.

Introduction This document discusses the potential key technologies for E- MBS to achieve higher performance improvements comparing with 16e, which include –Increase the spectral efficiency of MBSFN transmission –Enlarge the capability of single cell transmission Five techniques are proposed for multicast broadcast enhancement: –Open-loop SM and enhanced MBSFN –Enhanced single cell transmission –MBMS transmission cooperative with Relay –Network coding in multicast retransmission –optimal unicast/MBMS integration

Spatial correlation statistics in SFN SFN could not increase decorrelation in the actual systems from the meaning of statistics When MS is far from BS, the channels corresponding to different antennas are random enough, although it can receive from more than one BS, the correlation is not improved in fact. Similarly, when MS is near the BS, maybe the channel is a typical LOS channel, but because the signal from other BS is vary weak, it could not impact the existent channel correlation. Statistics in the whole cell Statistics in cell centre

Linear pre-coding to improve robustness of open-loop SM to spatial correlation Approach 1: CDD pre-coding Approach 2: Golden Code where,,,

SFN open-loop collaborative MIMO SOLCo-MIMO Scenario 2 Inter BS SFBC/STBC + Intra BS SM, full MBSFN Scenario 1 Inter sector CDD + Intra sector SM, partial MBSFN

Enhanced single cell transmission MIMO, HARQ and AMC for SC E-MBS –Feedback signals CQI CSI –Codebook Based on the selection of the maximum antenna channel gain for the worst MS –HARQ and AMC MS sends NACK back to e-NB, the packet is re-transmitted on the common resource The MCS is selected according to the worst reported CQI

E-MBS transmission cooperative with Relay Repeat transmission pattern for inter-RS/BS SFN operation scheme Alternative transmission pattern for inter-RS/BS soft/selective combining scheme

Network coding for multicast retransmission Multicast retransmission with network coding is to retransmit the coded combination of several packets. At the receiver side, by canceling the known accurate received packet, the retransmission packet could be detected in required MS. For random network coding, BS chooses two required packets randomly, encodes them and transmits. With network coding multicast retransmission and keeping the same PER level, 25% of retransmission could be saved in size of users. Retransmission packets ratio Receiver PER ratio

Optimal unicast and E-MBS integration We propose to integrate unicast and E-MBS signal by using Dirty Paper Coding (DPC) DPC technique makes the interference not incur any loss in capacity MS receiving unicast signal do not need to decode E- MBS signal firstly as superposition method.