access evolution 211014 1700 haixiang liang huawei
TRANSCRIPT
Dr. Haixiang Liang
Technical Director, Access
Technology Research, Huawei
How Close Are We to
Realising G.fast Potential
Page 2 HUAWEI TECHNOLOGIES CO., LTD.
Content
G.fast functionalities & standard status
Field trial & test experiences
Page 3 HUAWEI TECHNOLOGIES CO., LTD.
Service provider requirements
• Low cost,low complexity
• Reverse powering
Low CAPEX
• Low power mode
• Remote management
Low OPEX
• Data rate:1Gbps@50m、500Mbps@100m、200Mbps@200m
• Loop length: 250m or longer
• Support 16 ports,or up to 48、96 ports
• Backwards compatibility to existing DSL
• Flexible US/DS ratio
Strong competitive edges
• Customer self-installed Modem
• SELT、DELT、MELT
Easy to install & maintenance
Page 4 HUAWEI TECHNOLOGIES CO., LTD.
G.fast key functionalities (1/6)
Duplexing method:
G.fast TDD vs. VDSL2 FDD
Flexible DS/US asymmetry ratio
Easily supports low-power
states
Discontinuous operation
Simpler AFE
Downstream transmission opportunity Upstream transmission opportunity
Tg1
TDD Frame
time
Tg2Tds Tus
Downstream-upstream-guard-time Upstream-downstream-guard-time
Page 5 HUAWEI TECHNOLOGIES CO., LTD.
G.fast key functionalities (2/6)
Bandwidth:
106 MHz profile in the 1st version
212 MHz profile in a future amendment
Configurable start and stop frequencies, PSD shaping and notching
G.9700(13)_F7-2
ft r2ft r1
PSD indBm/Hz
Frequencyin MHz
−79
−73
−65
−76
10630
Page 6 HUAWEI TECHNOLOGIES CO., LTD.
G.fast key functionalities (3/6)
Modulation:
Discrete multi-tone (DMT)
G.fast VDSL2 17a
Subcarrier Spacing 51.75kHz 4.3125kHz
Number of Subcarriers 2048 for 106MHz profile
4096 for 212MHz profile 4096
Symbol Rate 48k 4k
Max Bit-loading 12 15
Transmit Power 4dBm 14.5dBm
FEC Trellis + RS Trellis + RS
Page 7 HUAWEI TECHNOLOGIES CO., LTD.
G.fast key functionalities (4/6) Mandatory support for vectoring – FEXT cancellation
Linear precoding in the 1st version
Non-linear precoding in a future amendment for strong FEXT
0 20 40 60 80 100 120 -80
-60
-40
-20
0
20 Cable with mild xtalk
Frequency/MHz
Attenuation/d
B
Direct channel
Total FEXT channel
0 20 40 60 80 100 120 -60
-50
-40
-30
-20
-10
0 Cable with stronger xtalk
Frequency/MHz
Attenuation/d
B
Direct channel
Total FEXT channel
@>50MHz, direct signal is only
3-10db above crosstalk
@>40MHz, direct signal is similar to
or even lower than crosstalk
Page 8 HUAWEI TECHNOLOGIES CO., LTD.
G.fast key functionalities (5/6)
PHY layer
retransmission
Improved
robustness against
impulsive noise
events (up to 10ms
duration) without
loss of data while
maintaining low
latency
Upper layers of management protocol
stack
γ_MGMT
α reference point
PMS-TC_MGMT
δ reference pointFTU Management Entity
DTU encoder
PMS-TC Management Entity
Receiver
Data frame Data frame
DTU in DTU out
DTU Interleaver
DTU Scrambler
RTX queue
Padding
RMC encoder
RMC message
Data frame MUX
RTX MUX
RMC scrambler
DTU queue
RM
C fram
er
Page 9 HUAWEI TECHNOLOGIES CO., LTD.
G.fast key functionalities (6/6)
Fast rate adaptation (FRA)
@ TDD frame rates (< 1ms)
Expected rate for 24AWG
500 Mbps @ 100m
150 Mbps @ 250m
Provides 8kHz NTR
Support for ToD
IEEE 1588
Upper layers of data protocol stack (user data)
γR reference point
TPS-TC_MGMT
αR reference point
FTU Management Entity
Data packet-to-DTU mapper
TPS-TC Management Entity
DTU-to-data packet mapper
Tx DTU Rx DTU
Tx flow control
eoc in
eoc out
TX Enable
STREAMus
STREAMds
Upper layers of management protocol stack
γR_MGMT
ToDNTR
RX Enable
Page 10 HUAWEI TECHNOLOGIES CO., LTD.
G.fast comparison with VDSL2
TDD •Reducing PHY complexity, reducing AFE requirement
•Flexible US/DS ratio, easier for discontinuous mode for low power
106/212MHz Extend the frequency to 106/212MHz
•Bandwidth : 6/12 times of VDSL2 17a
•Symbols rate: 12 times higher than 17a
FEC
Change from FDD to TDD
Same as VDSL2: trellis + RS
Vectoring Both use vectoring to cancel FEXT
•Stronger FEXT due to higher frequency band, more difficult
•Smaller vector size
Page 11 HUAWEI TECHNOLOGIES CO., LTD.
G.fast standard current status
G.9701 Amd 1: low power modes
G.9701 Amd x: 212MHz profile, nonlinear precoding, etc
2013
Q1 Q2 Q3 Q4
2014
Q1 Q2 Q3 Q4
2015
Q1 Q2 Q3 Q4
2016
Q1 Q2 Q3 Q4
G.9700
Determined
G.9700
Approved
G.9701
Consented
Consent
G.9701
Amd 1
Approve
G.9701
Amd 1
Approve
G.9701
Amd x?
Approve
G.9701
Page 12 HUAWEI TECHNOLOGIES CO., LTD.
Content
G.fast functionalities & standard status
Field trial & test experiences
Page 13 HUAWEI TECHNOLOGIES CO., LTD.
Early concept prototype
Typical: 1Gbps @100m and 500Mbps @200m
World’s first G.fast prototype
demo in Nov 2011
Page 14 HUAWEI TECHNOLOGIES CO., LTD.
G.fast FFTD/FTTDp product
Item Description
Size • 320*200*140 mm
NNI • 1*GPON/10G GPON
• 1*GE
UNI • 4-8 ports G.fast with vectoring
Frequency • 106MHz profile
Maximum output power • 4 dBm
Scenario • Manhole, pole, wall
Water proof • IP68
Heat dissipation • Natural cooling
Power • -48V DC local
Page 15 HUAWEI TECHNOLOGIES CO., LTD.
G.fast CPE
Item Description
Size • 230*205*80 mm
NNI • G.fast
UNI • 4*GE
Frequency • 106MHz profile
Maximum output power • 4 dBm
Vectoring • Support vectoring
Heat dissipation • Natural cooling
Temperature • 0~40℃
PSE • Integrated PSE
Power • 220V/110V AC
Page 16 HUAWEI TECHNOLOGIES CO., LTD.
BT field trial in lpswich in Oct 2013
• G.fast trial with BT in Ipswich UK
• 3 trial users, 10GPON backhaul
Splitter
G.fast DPU
10GPON
OLT
1st G.fast live customer trial G.fast CPE
Copper
Total: 1.046Gbps = 806.7M down + 239.6M up
CPE In Home DPU In Manhole Power Pillar for DPU
Page 17 HUAWEI TECHNOLOGIES CO., LTD.
G.fast trial with TeliaSonera in Feb 2014
G.fast trial: Co-exist with ADSL2+, VDSL2
ODF Existing TeliaSonera’s
VDSL2 equipment
Existing other operators’
ADSL2+/VDSL2 service
from CO
DC Power
G.fast DPU
G.fast co-exist with ADSL2+ & VDSL2
23MHz -88MHz with 500Mbps in total
G.fast trial in Helsinki in Feb. 2014
Page 18 HUAWEI TECHNOLOGIES CO., LTD.
G.fast trial with Swisscom in July 2014
G.fast trial in Riggisberg: Focus on 400m long distance and strong
crosstalk over paper insulated cable
Page 19 HUAWEI TECHNOLOGIES CO., LTD.
G.fast lab tests with 10+ operators
8-port G.fast
G.fast CPE
G.fast lab test with more than 10 operators
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