1. Non-Adaptive Precoding for E-MBS with Macro-Diversity Support (E-MBS)
Document Number: IEEE C802.16m-09/1876
Date Submitted:
Source:
Chih-Yuan Lin Pei-Kai Liao ), Yu-Hao Chang
and Paul Cheng
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 m AWD
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2. 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

3. 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

4. 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

5. 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

6. 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.