from XG-COPPER to Future Remote - etouches XG-COPPER to Future Remote • Hungkei (Keith) Chow •...
Transcript of from XG-COPPER to Future Remote - etouches XG-COPPER to Future Remote • Hungkei (Keith) Chow •...
© 2017 Nokia1 Confidential
Future of Accessfrom XG-COPPER to Future Remote
• Hungkei (Keith) Chow
• 29-MAR-2017
© 2017 Nokia2
Nokia Bell Labs XG-FAST record-setting technology
Delivering 10G over telephone lines
Bell Labs prototypeJuly 2014
2 Gbps @ 70m
10 Gbps @ 30m (2 pair TDD)
British TelecomOctober 2015
1.8 Gbps @ 100 m (1pair FDX)
5.6 Gbps @ 35m (1 pair FDX)
Deutsche TelekomFebruary 2016
10.4 Gbps @ 40m (2pair TDD)
XG-FAST FDXSingle user, single pair XG-FAST with Full Duplex
XG-FAST TDDSingle user, single pair XG-FAST with Time Division Duplexing
2014 speed records
G.Fast (106 MHz)
Confidential
© 2017 Nokia3
Nokia XG-CABLE (Full Duplex DOCSIS) timeline
Start of XG-Cable
project in Bell Labs
Jan 2014
CableLabs target for 1st
version of FDX DOCSIS 3.1
End 2017
First FDX demo
to MSOs
Dec 2014 – Jan 2015
announces FDX
DOCSIS 3.1 initiative
Feb 2016
Bell Labs publicly
demonstrates XG-Cable at
INTX
May 2016
Various
improvements on
algorithmic and
prototype design
Nokia completes
Gainspeed acquisition
Aug 2016
CableLabs starts FDX
DOCSIS 3.1 spec
effort
Sep 2016
Nokia joins
CableLabs
Jul 2016
Confidential
© 2017 Nokia4
Nokia Bell Labs XG-CABLE
World-first 10 Gbps symmetrical on HFC cable plant
100m coaxmodem
XG-CABLE
PoC
Fiber-to-the-Last-Tap (Point-to-Point coax drop)
10 Gbps
symmetrical
coax 7.5 Gbps
symmetrical
modemXG-CABLE
PoC
10.1 Gbps 8.0 Gbps
10.1 Gbps
7.5 Gbps
0
5
10
15
20
25
FTT-Last-Tap(p2p coax)
FTT-Last-Amplifier(p2mp coax)
Net
data
thro
ughput
[Gbps]
Downstream Upstream
Fiber-to-the-Last-Amplifier (Point-to-MultiPoint coax)
May 2016
Confidential
© 2017 Nokia5
Key Innovations
Nokia Bell Labs XG-CABLE Solution
• Combined analog and digital echo cancellation
• Removes the self-interference signal (echo) from transmitter into receiver
• Inspired by Bell Labs Vectoring algorithms (crosstalk cancellation)
Echo
Cancellation
• Combined echo cancellation and nonlinear distortion compensation
• Pre-compensates and post-compensates nonlinear distortion introduced
by the power amplifier and hybrid circuit
Distortion
Compensation
Interference
Management
• Combined MAC/PHY scheduling to mitigate inter-modem interference
• Enables coexistence with legacy modems
• Full-time full duplex and Aggregate full duplex concept offer performance and
complexity flexibility
Confidential
© 2017 Nokia6
Full Duplex operation will be limited to a specific frequency band
Current FDX DOCSIS Proposal
Upstream: Multiple 96 MHz-wide (max.) OFDM channels
Downstream: Multiple 192 MHz-wide (max.) OFDM channels
US
1218
f [MHz]
0 85-108 684
DS
300 492
DSDSDS
US US US
Legacy
Upstream
5-85 MHz
FDX DOCSIS 3.1 band
108-684 MHz
Legacy
Downstream
684-1218 MHz
US US US
• A FDX DOCSIS 3.1 cable modem will also be able to send and receive in legacy DOCSIS 3.1 outside FDX band
• A FDX DOCSIS 3.1 cable modem will be able to bond its traffic over the legacy and the FDX bands
Confidential
© 2017 Nokia7
Self-interference
Main challenges in full duplex transmissionCombining the Tx and Rx at
same frequency causes self-
interference (echo) signalTX
RX
ECHO
TX
RX
PA
EC H
Confidential
• Bell Labs Combined analog/digital echo cancellation achieves ~80dB cancellation depth over entire band
NL/noise
Tx signal
@ PA outputPower
For high channel losses,
the echo signal will
dominate
(plant/connector reflection
+ hybrid isolation)
Analog echo
ADC noise floorΣ will determine system
performance
Desired Rx signalEcho
Cancellation
© 2017 Nokia8
Nonlinear Distortion
Main challenges in full duplex transmission
Intermodulation
Frequency
3rd order IM product
5th order IM product
• To satisfy target DS fidelity level at low power consumption, PA operates at near compression region.
• Nonlinearities & memory effect harmonic distortion, spectral regrowth and intermodulation distortion
affect Tx and Rx performance
• Digital pre-distortion compensation technique improves Tx performance, but not the echo and Rx path
• Bell Labs combined EC/post-distortion compensation offers further SNR improvement of 10dB+
Power Amplifier
Transfer functionIdeal PA
Confidential
© 2017 Nokia9
Inter-modem interference
Main challenges in full duplex transmission
• In FDX, US signals can interfere with
DS signals on the shared network
• Strong US signal from one modem can
drown weak DS signal from another
Interference management
US
Full Duplex
node
DS
Modem 1 Modem 2
US interference
Confidential
© 2017 Nokia10
Power spectral densities throughout the N+0 cable plant
Target Rx PSD
for all modems
Node Tx PSD Modem Tx PSD
Modem Rx PSD
Power[dBmV/6MHz]
Frequency
Interference from cable modems at other taps
Full Duplex
Interference
© 2017 Nokia11
Interference from cable modems at other taps
Resulting Signal-to-Noise-and-Interference-Ratio (SNIR)
The interference varies over frequency, and needs to be measured
Bell Labs Orthogonal Sequence Sounding protocol offers better speed and accuracy
Confidential
© 2017 Nokia12
Resulting Signal-to-Noise-and-Interference-Ratio (SNIR)
IG 1 IG 2 IG 3
/…
IG 4
One example of interference grouping
Confidential
© 2017 Nokia13
What are we working on…
FDX DOCSIS Prototype Roadmap
• Expand upon Bell Labs Technology Demonstration
– Phase 1 (2017): Prototype development and demonstration
– Phase 2 (2018): Product one-port node development
Phase Capability What this enables?
XG-CABLE
Demo
Symmetric 8Gbps PHY demo over 1.2GHz Showcases echo cancellation enabling technology
and establishes Nokia as technology leader
Phase 1
FDX
DOCSIS
Prototype
• Demonstrate symmetric 1Gbps DOCSIS service
with FDX CCAP
• Showcases N+0 deployment with legacy
D3.0/D3.1 CPE (CM, STB) plus “special” FDX
CPE
• To test FDX capability in real network
environment
• Foundational work for delivering FDX product in
Phase 2
Nokia Confidential
© 2017 Nokia14
2017 Base Technology Development
FDX DOCSIS Prototype Plan
• 2017 Prototype functionality – “pre-standard” FDX
– Legacy services – Video, D3.0 (up to 32x8) and D3.1 (1x192 MHz DS)
– 1GHz top-end frequency
– 2x96 MHz FDX sub-bands under 650 MHz
– 2 FDX transmission groups (TG) with 1 FDX CPE per TG
• Static mapping of US and DS transmission frequency for each TG
• TG1 TX in lower 96 MHz FDX sub-band, RX in upper 96 MHz FDX sub-band
• TG2 RX in lower 96 MHz FDX sub-band, TX in upper 96 MHz FDX sub-band
• Node TX and RX in both 96MHz FDX sub-bands
– Demonstrate 1Gbps symmetric service over FDX CPE
Nokia Confidential
© 2017 Nokia15
The converged access solution for the Future X Network
Future of Access
ANY-media: xDSL, DOCSIS, cm/mmWave and low-band radio
ANY-split: Support various arch, e.g. remote-PHY, remote-MAC/PHY, remote-PHY+Scheduler, …
ANY-haul: Cable backhauling wireless Radio Head (RRH), mmW backhauling LTE-RRH, …
AUTO-managed: Self-organized with dynamic slicing across edge cloud to Remote
Confidential
Delivers fully programmable, software-defined 10G access for any deployment
LTE
ConfigLT
LT
LT
TOR
SD-OLT
SD-OLT
SD-OLT
Future Edge cloud
NetUnix
CU-DSL
CU-RAN
CU-Cable
TOR Cable
Config
Programmable &
reconfigurable
DSP Datapath
AFE
Future Remote
xDSL
Config
GP
CoreHW
Accel
XG-Cable
5G mmWave
XG-FASTAFE
AFE
AFELTE-advance
mmW
Config
© 2017 Nokia17
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Confidential
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