802.16m SDD Proposal
Document Number: S802.16m-07_240r3
Date Submitted: November 13 2007
Source:
Hokyu Choi, Jaeweon Cho, David Mazzarese
Jaehee Cho, Yungsoo Kim, DS Park
Samsung Electronics
Voice:
E-mail:
[Telephone Number (optional)]
choihk@samsung.com
Venue:
Atlanta, GA
Base Contribution:
C80216m-07_240r3
Purpose:
Discussion and approval by TGm for the 802.16m SDD
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 >.
Summary
•
•
Based on the joint SDD system architecture proposal [1],
four more issues are presented in this slides:
– Further thought on legacy support
– Self organization network, Multi-carrier support, MIMO architecture
Self organization function and multi-carrier support
– Included in the proposed joint SDD contribution [1]
– In this contribution, clarification is given for system architectural issues regarding
those features
•
Multi-carrier Support
– There are wide range of possible scenarios in single & multi-carrier support.
– Moreover, legacy support also adds up additional scenarios to multi-carrier support.
– In this contribution, we intend to show full range of possible scenarios so that initial
discussion can focus on discriminating unrealistic and unnecessary scenarios before
802.16m have detail solution.
•
Generic DL MIMO architecture
– The possible range of MIMO discussion would be very wide.
– A generic MIMO architecture can function as a place-holder of any kinds of
proposals while keeping overall architecture maintained.
– MIMO discussion in 802.16m will change the architecture more and more
specific and detail as discussion goes.
[1] IEEE 80216m-07/297 “Proposal for IEEE 802.16m System Architecture and Protocol Structure”
Further thoughts on Legacy Support
Further Thoughts on Legacy Support
•
Resources (time, frequency, space, code, …) can be divided for 16e and 16m
– Time or Frequency are most reasonable resources to divide
: TDM vs. FDM for multiplexing legacy (16e) and 16m signals
– Recommend to take a careful investigation in choosing TDM or FDM in
detail discussion phase based on proper evaluation.
DL subframe
Legacy (16e)
or
16m
OFDM symbols
OFDM symbols
<DL TDM>
<DL FDM>
UL subframe
UL subframe
16m
Legacy (16e)
or
16m
OFDM symbols
OFDM symbols
<UL TDM>
<UL FDM>
SubCH
Legacy
(16e)
SubCH
Uplink
16m
SubCH
•
Downlink
SubCH
•
Legacy
(16e)
DL subframe
4
Self Organizing Networks
5
Self Organizing Network Architecture
SO Network architecture
EMS
(SO)
It also requires network side work.
BS
(SO)
R1
BS
(SO)
Data Plane
R1
Control Plane
MS
MS
Management
Plane
Scope of 16m
•
•
•
•
Self Organization (SO) includes self-configuration and self-optimization.
Element Management System (EMS) performs SO functions over BSs.
– EMS is not in the scope of 16m
BS performs SO functions over neighboring BSs and MSs.
MS may perform measurement and report for SO operations.
6
Self Organization Mechanism
Management plane
Data/control plane
EMS
SON
Function
Higher Layer
BS
Convergence Sublayer
Self
Organization
SON
Function
MAC Common Part Sublayer
Fragmentation/Packing
Control Signaling
MAC PDU formation
Resource
Mapping
Encryption
Measurement
PHY Layer
Control
•
Management
Scope of 16m project
SO procedures & signaling
– Procedures may include measurement request/response for SO mechanism.
– SO reference signals may be defined to enhance the SO mechanisms.
• Control signaling block may send the SO reference signal under supervision
of SO block
7
Single & Multi-Carrier Support
8
Definitions
• Multi-carrier
• Multiple RF and PHY
• Packet aggregation in MAC layer
• Single-carrier
• Scalable Bandwidth
Scalable Bandwidth
• Same OFDM symbol length
• Same frequency subcarrier spacing
Multi-carrier
5MHz
5MHz
5MHz
10MHz
5MHz
10MHz
20MHz
Single-carrier
9
Possible Single/Multi-Carrier Scenarios
•
•
Single carrier BS
– BS, having a single wide band,
supports MSs with narrower BW
– For inter-working (roaming) among
scalable bandwidths
Multi carrier BS
– Contiguous or Non-contiguous bands
– Single or Multiple bandwidths
(BS1 = BS1’ or BS1 < BS1’)
– BS1/BS1’ = 16e/16m or 16m/16m
BS
BS1
MS1
MS1
MS2
MS3
BS1’
MS2
Possible scenarios
MS3
MS4
MS3
MS3
MS4
MS5
MS5
BS
BS RF+PHY
MS
MS RF+PHY
Frequency Overlay
10
MIMO Architecture
11
MIMO Architecture
iFFT
Buffer Data
Packets
selection
Resource block
parsing
Bit streams
Bit-level
processing
QAM
modulation
MIMO Encoding
and Mapping
(to a basic timefrequency
resource)
Codewords
Symbols per
transmit antenna
OFDMA
Framing
iFFT
User selection
Resource allocation
Number of
codewords
MCS setting
Space-time encoding
(STC, SM)
Closed-loop precoding
(vector, matrix)
Downlink control channels
RRM, Scheduler
Uplink feedback channels
CQI and CSI feedback
Retransmission success/failure indication
Feedback requests and
resource allocations to
mobile stations
Open-loop/closed-loop MIMO
adaptation
Single-user/multiuser MIMO
adaptation
12
MIMO Encoding and Mapping Block
• MIMO processing is uniquely described by the encoding and mapping:
– Input: codewords of modulated symbols
– Output: basic time-frequency resource block for each transmit antenna
• A specific MIMO mode only needs adapting the processing blocks
within the MIMO encoding and mapping block
• Selection of MIMO mode for adaptation to operating conditions may
be based (among other things) on feedback of
– Channel Quality Information (CQI)
– Channel State Information (CSI)
• CQI and CSI may both be used in the scheduler, but also:
– CQI: for modulation and coding rate adaptation in bit-level processing
– CSI: for signal processing within MIMO encoding and mapping block
13
MIMO Encoding & Mapping
MIMO Encoding & Mapping
Single-user / multiuser
Single / multiple
codewords
One codeword for
one MS
One codeword for
one MS
•
•
•
•
MIMO matrix construction
(layering, ST codeword)
Mapping of codeword
symbols to MIMO
matrix
OFDMA Framing
OL MIMO / CL MIMO
Precoder
Mapping matrix (or
vector) symbols to a
basic time-frequency
resource
Support of single and multiple codewords
Support of diversity, multiplexing, precoding
Support of SU/MU MIMO, OL/CL MIMO
Precoder support for closed-loop MIMO:
Mapping basic timefrequency resource
to subchannels
Other framing
processes
– Beamforming with one or several beams
– Beamforming to one or several users
– Adaptation to short-term and/or long-term CSI
14
Q&A
15