802.16m SDD Proposal
Document Number: 802.16m-07_240
Date Submitted: November 12, 2007
Source:
Hokyu Choi, Jaeweon Cho,
Samsung Electronics
Voice:
E-mail:
[Telephone Number (optional)]
choihk@samsung.com
jaeweon.cho@samsung.com
Venue:
Atlanta, GA
Base Contribution:
Call for Contributions on IEEE 802.16m System Description Document 802.16m-07_040
Purpose:
Discussion and approval by TGm for the 802.16m SDD
Notice:
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Self Organizing Networks
2
Self Organizing Network Architecture
SO Network architecture
EMS
(SO)
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.
•
•
BS performs SO functions over neighboring BSs and MSs.
MS may perform measurement and report for SO operations.
–
EMS is not in the scope of 16m
3
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
4
Multi-Carrier Support
5
Definitions
• Multiple RF and PHY
• Packet aggregation in MAC layer
Multi-carrier
Scalable Bandwidth
• Same OFDM symbol length
• Same frequency subcarrier spacing
5MHz
5MHz
5MHz
10MHz
5MHz
10MHz
20MHz
Single-carrier
6
Possible Single/Multi-Carrier Scenarios
•
•
Single carrier BS
Multi carrier BS
– Contiguous vs. Non-contiguous
– Single or multiple bandwidths
– Packet combined in MAC layer
BS
BS-1 BS-2
MS
MS
MS
MS
MS
MS
MS
MS
MS
MS
BS
BS RF+PHY
MS
MS RF+PHY
MS
Realistic case
Frequency Overlay
7
MIMO Architecture
8
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
Coordination among multiple base stations
Feedback requests and
resource allocations to
mobile stations
Open-loop/closed-loop MIMO
adaptation
Single-user/multiuser MIMO
adaptation
9
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
10
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
11
Q&A
12