g.fast - Irisa

Transcription

g.fast - Irisa

TRENDS IN HYBRID FIBER-COPPER ACCESS NETWORKS
Jochen Maes, Broadband Innovation, Bell Labs Alcatel-Lucent
Keynote @ IEEE Globecom Standards Workshop, 2014
COPYRIGHT © 2014 ALCATEL-LUCENT. ALL RIGHTS RESERVED.
FTTH
THE NEXT BIG THING SINCE DECADES
1989
Delays and unexpected cost increase due to
• Difficulties in mobilizing a large
workforce
• Delays in finalizing agreements among
parties involved
• Network turned out less fiber-ready
than expected
1988
1988
Kudelka
2
REALITY: GRADUAL EXPANSION OF THE FIBER NETWORK
Copper
Fiber
< 5 km
ADSL2+
< 2 km
VDSL2
Vectored
VDSL2
≈ 10−20 Mb/s
≈ 20−50 Mb/s
< 1 km
Vectoring
< 250 m
G.fast
Time
≈ 100−150 Mb/s
≈ 0.5−1 Gb/s
Vectoring
< 50 m
XG-FAST
≈ 5−10 Gb/s
Vectoring
Leverage legacy network for rapid nation-wide service upgrades
3
BROADBAND OVER A HYBRID FIBER-COPPER NETWORK
1010000
Gb/s
XG-FAST
G.fast 212MHz
1 1000
Gb/s
G.fast 106MHz
+ bonding & vectoring
+ vectoring
+ bonding
VDSL2 17a
VDSL(2) 8b
ADSL2+
100 Mb/s
100
10
10 Mb/s
ADSL2
ADSL
1
1 Mb/s
1995
2000
2005
2010
4
2015
2020
DRIVERS FOR BANDWIDTH
Applications
Competition
Regional incentives
ACCESS NETWORKS AROUND THE GLOBE CONTINUOUSLY
NEED TO TRANSFORM TO KEEP UP WITH BANDWIDTH
DEMANDS
EU Digital Agenda
30M for all, 100M for 50% by 2020
China 12th 5-year plan
FTTH (CT: 100M for 100M by 2015)
Connecting America
FCC National BB plan
100M for 100M by 2020
Australia NBN
100M for 90% by 2020
India National Backbone
Broadband for 90% by 2013
New Zealand UFB
Brasil Plano Nacional
100M for 75% by 2020
100 Mb/s tier driven by national incentives
6
GRADUAL FIBER DEPLOYMENT
CO deployment
CO
passive
cross-connect
cabinet
FTTCab
CO
mini
DSLAM
VDSL2 VECTORING CONCEPT
Vectoring performance
COPPER PAIRS INTERFERE WITH
EACH OTHER, REDUCING
BITRATES
Vectoring = noise cancellation headphones for your copper plant
8
Non-vectored
G.VECTOR: CROSS-WHISPERING
XTALK
Noise cloud
Transmitter
Channel
Vectored
Transmit
signal
-60
Received power (dBm/Hz)
99% worst case model
-80
Received signal
SNR
-100
Received crosstalk
-120
Modem noise floor
-140
-160
0
5
10
20
15
Frequency (MHz)
25
30
9
Receiver
Receive
signal
VECTORING IS ON THE RISE
HELPS OPERATORS GET MORE FROM THEIR DSL COPPER NETWORKS
ADSL
since B 1998
VDSL2
since M 2005
Vectoring
BBWF 2014
25+ CUSTOMER
LINES]
65+ TRIALS
9.4M VECTORING LINES
since E 2011
ALCATEL-LUCENT SHIPMENTS [MIO
BBWF 2013
17 CUSTOMER
55+ TRIALS
2.4M VECTORING LINES
ALU 1st to announce
vectoring product
BBWF 2012
6 CUSTOMER
20+ TRIALS
90K VECTORING LINES
connects 1st user
with VDSL2 vectoring
9
2011
12
2011
1st nationwide VDSL2
vectoring activation
3
6
9
12
3
6
2012 2012 2012 2012 2013 2013
9
12
3
6
9
12
2013 2013 2014 2014 2014 2014
10
GRADUAL FIBER DEPLOYMENT CONTINUES
CO deployment
CO
passive
cross-connect
cabinet
FTTCab
CO
mini
DSLAM
FTTdp
CO
micro
node
G.FAST: CROSS-SHOUTING
Transmit signal
above PSD mask
• Channel no longer
diagonally dominant
• Power constraints must be
met
• Alternatives to linear zeroforcing become interesting
Transmitter
Channel
Transmit
signal
Receiver
XTALK
Receive
signal
-70
Received power (dBm/Hz)
-80
Transmit
signal
-90
-100
Received signal
Received crosstalk
-110
-120
SNR
-130
-140
Modem noise floor
0
20
40
60
80
100
120
140
Frequency (MHz)
160
180
200
Precoder
User
signal
 x1   P11 P12 P13   u1 
 x  =  P P P  u 
 2   21 22 23   2 
 x3   P31 P32 P33  u3 
Power on line
Power of user signal
M. Guenach, et al., IEEE Globecom 2014
12
VECTOR 2.0
MEASURED
SIMULATED
2200
2.3 to 211.9 MHz
2.3 to 105.9 MHz
17.7 to 105.9 MHz
17.7 to 105.9 MHz
2000
Aggregate data rate
Flexible (dynamic?) allocation to
down or up
Aggregate data rate (Mb/s)
1800
no XT
no XT
no XT
with XT
1600
1400
1200
1000
800
600
400
Large crosstalk
Impact: gain scaling,
discontinuous operation,
non-linear precoding.
200
0
0
50
100
150
Loop length (m)
200
The numbers are in
Rate/reach
• Trials show huge impact of crosstalk
• And huge benefit of Vector 2.0
• High variability in cable quality, both single
user and crosstalk
• G.fast cable model (CAD55)
• One 99% worst case crosstalker
13
250
FTTDP ARCHITECTURE
1 to 48 users per remote network equipment
(X)GPON, P2P, copper backhaul
BBF WT-301 FTTdp
Aggregation
CPE
Passive
splitter
DPU
ITU-T
150 Mb/s vectored VDSL2 17a
(250 Mb/s with 30a)
1 Gb/s G.fast
DPU
G.fast
transceiver
Power
extraction
60 Vdc
DPU power
supply unit
Power
insertion
G.fast
transceiver
Power
source
DPU can be powered from the customer premises
ETSI TM6 101548 CPE powered network equipment
Timmers et al., IEEE ICC 2012 – workshop from reasearch to standards
power consumption as
function of # active lines
power that can be delivered
with reverse powering
REVERSE POWERING
Maximum power use
Local
Subtending
node
G.fast gateway
fiber
unused copper pairs
Forward
A
DPU
Single line power use
Reverse
C
B
•Persistent Management Agent (PMA)
•DPU with dying gasp
•Distribution point managed using
Yang data modeling language of the
NETCONF L2 protocol
Management
element
Max power
injected at
CPE
example
line
Max power
received at
access node
NETCONF
YANG
PMA
DPU
Reverse
power
DISCLAIMER:
indicative figures,
not product specification
15
Loop length
652 MBit/s US+DS TRAFFIC
(74m in-house cable)
Source: A1 in cooperation with ALU
17
G.FAST GIVES HUNDREDS OF MBIT/S OVER LEGACY TWISTED
PAIRS
ALSO WORKS ON COAX
G.fast end frequ configured to 65 MHz to
avoid interference with CATV signal
G.fast on twisted pair in overlay with VDSL2 17a
G.fast equally works on coax!
Source: BT Labs in cooperation with ALU
Source: test by ALU in operator lab
18
G.FAST OFFERS CONTROL OVER UP/DOWN BIT RATE RATIO
• G.fast makes use of Time Division
Duplexing allowing a flexible
configuration of the upstream /
downstream ratio
US
DS
US
DS
US
time
TDD frame
(e.g. 750µs)
MDS
MUS
• All G.fast lines in the same cable need
to be synchronized, with the same
up/down split
- In presence of crosstalk
Source (bit rate figure): Orange Labs in cooperation with ALU
19
G.FAST ALLOWS FOR END-USER SELF-INSTALLATION
SOME (MODEST) BIT RATE LOSS IN CASE OF BRIDGED TAPS IN-HOUSE
bridged tap 2m, 10m, 20m
100m
BT length
no
20m
10m
2m
DS loss
0%
-6%
-6%
-13%
US loss
0%
-5%
-4%
-8%
Bit rate loss may increase
if multiple bridged taps
Source: ChuangHwa Telecom Labs (CHT-TL) in cooperation with ALU
20
G.FAST ALLOWS CO-EXISTENCE WITH VDSL2 AND RADIO
SERVICES
• ITU-T G.9700 specifies power spectral
density (PSD) mask requirements for
G.fast and a set of tools to reduce the
transmit PSD mask for compliance
with:
- Regional requirements
- Operator requirements e.g. spectrum
compatibility and coexistence with other
xDSL access and home network
technologies
DS bit rate loss due to skipping bands: ~10%
(e.g. 558 Mb/s  500 Mb/s)
- Radio services
- EMC requirements
Source (PSD figure): BT Labs in cooperation with ALU
G.fast start frequency
(e.g. 23 MHz) for
compatibility with
VDSL2 in same cable
21
E.g. spectral notches or
tone masking for
protecting sensitive
radio bands
GRADUAL EXPANSION OF THE FIBER NETWORK
Copper
Fiber
< 5 km
ADSL2+
≈ 10−20 Mb/s
< 2 km
VDSL2
≈ 20−50 Mb/s
< 1 km
Vectored
VDSL2
≈ 100−150 Mb/s
Vectoring
< 250 m
G.fast
≈ 0.5−1 Gb/s
Vectoring
< 50 m
XG-FAST
Vectoring
Time
22
≈ 5−10 Gb/s
HOMES PASSED FIBER NETWORK
HOMES CONNECTED COPPER NETWORK
Distribution Point Unit
• Single or very few subscribers
• Very close to end user
SDN control
Fiber backhaul
PMA
Aggregation
Reverse powering
• User doesn’t need to power shared hardware
• Short cables have low resistive loss
23
Multiple pairs per subscriber
• No/little inter-user crosstalk
• High intra-user crosstalk
LEOPARD XG-FAST PLATFORM
WORLD RECORD SPEEDS
over 2 pairs
CAT5e
over 1 pair
2 pairs available
operator cable
CAT5e
Single pair
operator cable
W. Coomans et al., IEEE Globecom 2014, workshop From Research to Standards.
24
SPEED UP ADOPTION OF ULTRA BROADBAND SERVICES THROUGH
HYBRID FIBER-COPPER NETWORKS
FTT…
NODE
CURB
MANHOLE POLE
VDSL2 VECT
>200 METER
>100 SUBSCRIBERS
BUILDING DRIVEWAY FRONTDOOR
G.fast
<200 METER
10s OF SUBCRIBERS
25
XG-FAST
10s OF METERS
1 SUBSCRIBER

g.fast - Irisa

Transcription

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