IEEE C802.16m-09/0269
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Codebook Subset for IEEE 802.16m Amendment
Date
Submitted
2008-01-07
Source(s)
Chih-Yuan Lin, I-Kang Fu, Pei-Kai Liao, chihyuan.lin@mediatek.com
Yu-Hao Chang, Paul Cheng
IK.Fu@mediatek.com
MediaTek Inc.
Re:
IEEE 802.16m-08/053r1, “Call for Comments and Contributions on Project 802.16m
Amendment Working Document.”
- DL MIMO
Abstract
In order to reduce the overhead by PMI reporting, the codebook can be categorized as predefined
subsets and AMS can only report the PMI based on the codebook subset. The codebook subset
can be purely a logical subset and will not impact on the codebook to be chosen by TGm.
According to the SDD text description on codebook subset, this contribution proposes to add the
corresponding sub-section and preliminary text into P802.16m amendment working document.
Purpose
For review and adoption by TGm members
Notice
Release
Patent
Policy
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1
IEEE C802.16m-09/0269
Codebook Subset for IEEE 802.16m Amendment
Chih-Yuan Lin, I-Kang Fu, Pei-Kai Liao, Yu-Hao Chang, and Paul Cheng
MediaTek Inc.
1. Overview
In Section 11.8.2.2.3.2 of SDD [1], the idea of codebook subsets had been already adopted in 802.16m
for codebook-based MU-MIMO: (line#6, page#104 in [1])
“…The MU MIMO codebook contains subsets of the unified codebook (including full set) to support both
unitary and non-unitary precoding. When codebook-based feedback is used, the ABS indicates which
codebook subset (including full set) will be used explicitly or implicitly.”
ABS can determine and broadcast which codebook subset to be used based on system conditions
(e.g. distribution of the AMS supporting MU-MIMO, inter-cell interference). In addition, ABS may
allow AMS to only choose the best precoding vector/matrix in the selected codebook subset, so as to
reduce the report overhead. Codebook subset management does not associate with the codebook design,
and thus can be applied to any kind of codebook as long as the subset signaling mechanism is
established.
In this contribution, it is recommended to have an individual subsection in Section 11.8 to describe the
definition of codebook subset. Only the preliminary definition and notation are suggested, the detail
management operation will depend on TGm’s decision on codebook format and member’s further discussion.
2. Proposed Text
We propose the following text for the P802.16m Amendment in Section 11.8
------------------------------- Start text proposal
15.3.6
---------------------------------------------------
DL MIMO Transmission
15.3.6.x MU-MIMO codebook subset
The MU-MIMO codebook contains subsets of the SU-MIMO codebook (including full set). The size of a
specific SU-MIMO codebook is denoted as N size . The number of subsets is denoted as N subset , the ith one
N
N element ,i . The
among which contains N element ,i precoding vectors/matrices. Therefore, N size is equal to  i subset
1
parameters N size , N subset , and N element ,i for each codebook subset configuration is defined as following [TBD].
When the MU-MIMO transmission is enabled, ABS shall explicitly inform the AMS the codebook subset to
be used for PMI reporting. Then the AMS shall report the PMI recommendations according to the index
associated to the predefined codebook subset informed by ABS.
------------------------------- End text proposal
---------------------------------------------------
References
[1] IEEE 802.16m-08/003r6, “The Draft IEEE 802.16m System Description Document”.
2