5g enabling technologies - upm 5g/subsitio/novedades... · lte: k (4) symbols mapped to k (4)...
TRANSCRIPT
5G Enabling Technologies
An Unified Adaptive Software Defined Air Interface
Dr. Peiying Zhu
Huawei Fellow
Sept 3rd, 2014, PIMRC
5G World
Everything on Mobile Everything Connected Everything Virtualized
400MHz
100GHz
10GHz
D2D
VerticalsMBB
Open OTT
SDN-RAN
IoT
5G(Beyond Smartphone)
Capacity 1000X
(Capacity/km2)
Speed 100X
(10Gbps)
Latency Less than
1ms
Links 100x
Energy 1000X
Reduce
Auto-drive Medicare
Robots Meters Sensors
Transform the Industry Verticals
5G(Beyond Internet Access and APPs)
Latency (ms)
Links(Per/km2)
Speed(kbps/km2)
Unprecedented Performance Challenge
No-Cell Virtual RAN
Software Defined &Simplicity
Service Aware and Monetize
Stretched in 3 Dimensions
Speed
Links
Response
Spectrum Efficiency
All Spectrum Access
Networks Re-Architect Challenge
Cellu
lar
Ban
ds
Vis
ible
Lig
ht unlicensed unlicensed
10 20 30 40 50 60 70 80 90 5 GHz
50m 50-100m 0.5-2km 40GHz 2.5GHz 0.5GHz
Primary
Band
Complementary
Band
Macro 1Gbps~4Gbps
Micro 3Gbps~10Gbps
Local 10Gbps~100Gbps
Single & Unified Air-Interface
for All Spectrum Access
Foundational Technologies
Massive MIMO
5G mmWave
Full/ Flexible Duplex
5G RAN&Core
5G UE
5G Vertical
Product Development Phase
Standardization Phase
5G Air
Interface
(2014
-2018)
Research Phase
Air Interface Characteristics
Virtualized
& Software
Defined
RAN
Primitives
Variable
sub-Carrier
Tailored to
Applications
Ultra-narrow Bands for Internet of Things Applications
Ultra-wide-Bands for Virtual Reality Applications
Ultra-low Latency for Vertical Applications Capacity
X1000
Latency
X1/10
Links
X100
Coverage
30dB
Reliability
x1000
Mobility
500km/h Spectrum
Efficiency
X30
Sparse Code
Multiple Access
(SCMA)
F-OFDM
Spectral
Localization
Orthogonal-
free &
Synchronous
free
SCMA (Sparse Code Multiple Access)
A new frequency domain non-orthogonal
waveform Input bits are directly mapped to codewords and spread over multiple sub-carriers
Codewords can be assigned to same UE (SU-SCMA) or different UEs (MU-SCMA)
Non-orthogonal multiplexing of code layers
Over-Dimension to increase overall rate and
connectivity
Sparsity to limit Rx complexity for detection
Multi-dimensional codewords with shaping gain
Spreading for robust link-adaptation, coverage
UE1
UE2
UE3
UE4
UE5
UE6
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
FEC Encoder 1
FEC Encoder 2
FEC Encoder 3
FEC Encoder 4
FEC Encoder 5
FEC Encoder 6
b11b12…
b21b22…
b31b32…
b41b42…
b51b52…
b61b62…
f
SCMA block 1 SCMA block 2
SCMA: N (6) symbols mapped to K (4) sub-carriers
(N > K, overloading)
LTE: K (4) symbols mapped to K (4) sub-carriers
SCMA Code Book
UE1 UE2 UE3 UE4 UE5 UE6
(1,0) (0,0) (1,1) (0,1) (b1,b2) (1,0) (1,1)
16-point orthogonal lattice
in 4 real dimensions
Unitary
lattice
rotation
Rotated 16-point lattice
in 4 real dimensions
Mother
constellation
Projections on first and
second complex dimensions
QPSK 1 QPSK 2
0000
0000
SCMA codebook based on Multi-dimensional Lattice Constellation to exploit shaping gain and coding gain
Each UE/layer stores a unique codebook
Binary input data is mapped to a codeword of the corresponding codebook
Low PAPR and low projection codebooks possible
Scalable SCMA
with Adaptive System Parameters
System requirements
Network/UE
capabilities
SCMA Parameters
SCMA
Configuration SCMA Mode
Link-budget
Coverage
Connectivity
Throughput
Multiplexing gain
Processing
capabilities
……
SCMA
OFDMA (fall back mode)
NOMA (fall back mode)
……
Number of codewords of an SCMA codebook: M
Spreading factor: K
Max number of layers (or codebooks/signatures) : J
Number of nonzero elements of each codeword: N
……
Flexible and scalable SCMA based access scheme which can compromise among spectral
efficiency, coverage, detection complexity, connectivity, and link budget to adapt to different
application scenarios
Issues for OFDM Waveform
OFDM
FBMC
Spectrum not localized, need guard band
Frequency
Time
OFDM
sub-carrier
spacing=15 kHz
Not flexible to change sub-carrier spacing in Frequency
time
Ch. 1
Ch. 2
Ch. 3
freq.
OFDM
UE #1
OFDM
UE #2
OFDM
UE #3
time
FFTdata of all
UEs
Synchronous Tx, large overhead for time alignment
frame
10 ms
TTI-1 TTI-2 TTI-
10
1 ms
Slot-
1
Slot-
2
0.5 ms
Symbol-1 Symbol-2 Symbol-7
Cyclic prefix (4.7 s)
66.7 s
Cyclic prefix (5.2
s)
Normal CP
frame
10 ms
TTI-1 TTI-2 TTI-
10
1 ms
Slot-
1
Slot-
2
0.5 ms
Symbol-1 Symbol-2 Symbol-7
Cyclic prefix (16.7
s)
66.7 s
Cyclic prefix (16.2
s)
Extended CP
Fixed symbol duration, not flexible to change CP
Spectrum Filtered OFDM (f-OFDM)
1. Sub-band digital filter
is applied to shape the
spectrum of subband
OFDM signal.
2. Orthogonal
subcarriers within
each subband
3. Allow co-existence of
waveforms with
different OFDM
Primitives
Frequency
Time
OFDM
sub-carrier
spacing=15 kHz
OFDM
sub-carrier spacing=3
kHz
OFDM
sub-carrier
spacing=30 kHz
Spectrum Filtered OFDM (f-OFDM)
1. Sub-band digital filter
is applied to shape the
spectrum of subband
OFDM signal.
2. Orthogonal
subcarriers within
each subband
3. Allow different cyclic
prefix for each specific
sub-band
Frequency
Time
F-OFDM Supports Asynchronous
OFDMA
time
Ch. 1
Ch. 2
Ch. 3
Freq.
Filtered
OFDM
UE #1
Filter #1Freq. Short FFT
processing
for UE #1
Short FFT
processing
for UE #2
Short FFT
processing
for UE #3
Filtered
OFDM
UE #2
Filtered
OFDM
UE #3
Filter #2
Filter #3
1. Support
asynchronous
OFDMA
transmission
2. Non timing
advance
signal needed
Spectral Filtered OFDMA
Characteristics
1. Good out-of-band
leakage rejection
2. Similar spectrum
localization
performance
compared to
FBMC
3. Maintain all the
benefits of OFDM
4. Easy for m-MIMO
-8 -6 -4 -2 0 2 4 6 8-180
-160
-140
-120
-100
-80
-60
-40
-20
0PSD Spectrum
Frequency(MHz)
PS
D
OFDM
UFMC
Filtered-OFDM
FBMC
2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7
-140
-120
-100
-80
-60
-40
-20
PSD Spectrum
Frequency(MHz)
PS
D
Flexible Time-frequency Lattice
1. Co-existence of
different time-
frequency
granularities
2. Waveform
optimized for
different
transmission
condition and
applications
3. Regional
broadcasting, high
speed train, fixed
devices,……
4. Subband
spectrum filter to
control inter-block
interference
Spectrum filter
f
t
OFDM symbol
duration Guard time
Sub-carrier spacing
f
t
OFDM symbol
duration
Guard time
Sub-carrier spacing
Frequency
Time
An Unified Adaptive Software Defined Air
Interface to Meet Diverse Services Demand
Unified air interface to support
different waveform / multiple access schemes / flexible TTI
UE1
UE2
UE3
UE4
UE5
UE6
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
SCMA MODULATION
CODEBOOK MAPPING
FECEncoder 1
FECEncoder 2
FECEncoder 3
FECEncoder 4
FECEncoder 5
FECEncoder 6
b11b12…
b21b22…
b31b32…
b41b42…
b51b52…
b61b62…
f
SCMA block 1
TIME
FR
EQ
UE
NC
Y
IoT
Networks
Vehicular
Networks
HDV
Networks
Smart Life
Networks
HD Video
Surveillance
Meter &
Sensor
High Speed
Train
Automatic
Driving
Wireless
Cloud Office
Voice
Gaming
SCMA Prototype and Field Trial
5G Timeline