Advantech - Novas tecnologia em redes VSAT que melhoram a escalabilidade e performance - Claudio Frugis

1. 111
SMALL STEPS TOWARDS
RISK MITIGATION
Claudio Frugis
Head manager
Advantech Wireless do Brasil
VSAT Day 2012 – Rio de Janeiro

2. 2
Scope
The VSAT industry is
continually changing as new
technologies, frequencies,
applications and platforms
are brought to market.
DVB-S→ DVB-S2→ DVB-S3(?)
Ka-Band →V Band
Hardware costs drop 30% every
10 years
Throughput increases x10 every
10 years
2
Small Steps Towards Risk Mitigation

3. 3
Scope
To what extent do costs have to be driven down
further?
Are there products in place that enable greater
innovation by service providers?
What are the market implications?
3
Small Steps Towards Risk Mitigation

4. 4
Ka & V Band Experience
Canadian Space Agency (CSA) program started in early 1990s for
communications for Canada in 2000 and beyond.
Advantech Wireless (part of Spar Aerospace) led Ka Band study in the early 1990s
with Telesat, Norsat, Comdev
Study identified Ka Band as the next major new technology
SES BBI (ARCS) Program
Delivered DVB-RCS system based on Ka Band inbounds and Ku Band outbounds
(2000)
CSA V Band Program
Advantech Wireless (with MDA, Telesat, Comdev) investigated use of V Band
Delivered 2 DVB-RCS Ka Band hubs
to Telesat for Vancouver and Winnipeg
Delivered 3 DVB-RCS Ka Band hubs
to DISA for WGS

5. DVB-RCS Experience
DVB-RCS Open
Standard
Advantech instrumental in
creation of air interface
Based on SES Astra BBI
Program delivered by
Advantech in 2000
Designed from top down
as broadband network
Original SES Astra BBI hub
capable of supporting 200K
subscribers
5

6. DVB-RCS Experience
DVB-RCS Multi-Carrier
Demodulator
World’s Most Advanced
Supports up to 96 carriers on
a single card
Throughput up to 24 Mbps
Multiple carrier rates on a single
card
Flexible architecture to optimize
MF-TDMA frame structures
Encapsulation formats
Signalling overhead
And much more!
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Advantech Wireless’ Industry-leading MCD2

7. 7
Introduction
Main driver to lower OPEX
Efficient use of satellite resources
Critical for efficiency
A satellite access technique well
matched to the network traffic and
applications
Increasing demand for improved
satellite efficiency
Scarcity of bandwidth in certain
markets
How can this be
achieved ?
7

8. 88888
Review of
Satellite Network
Access Technologies

9. 9
Network Access Review:
DVB-RCS TDMA Star/SCPC PTP Architecture
DVB-RCS Star Network with
SCPC point-to-point (PTP)
overlay
DVB-RCS hub station for RCS
signaling, synchronization, MF-
TDMA access and SCPC PTP
connection control/bandwidth
allocation (SCPC DAMA)
SCPC PTP overlay uses DVB-S2
coding and modulation
Satellite terminal indoor unit
(S6520) with second DVB-S2
demodulator
9

10. 1010
Comparison of SCPC vs TDMA
SCPC
Physical layer – SCPC is better than
TDMA (bits/Hz)
Bits/Hz→ Bits of information traffic per
Hz of satellite bandwidth
The higher the bits/Hz the more
efficient the access scheme
Less satellite resources required to carry
the traffic: less OPEX
TDMA
Bandwidth utilization – MF-TDMA is
better than SCPC or SCPC DAMA
Allows sharing (statistical multiplexing)
of a carrier by different sources of traffic
All satellite resources are used, nothing
is wasted: less OPEX
Burst-like traffic
(Internet browsing,
SCADA, transactional,
Banking Machines)
Continuous
streaming traffic
(video, trunking
data)
SCPC TDMA

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Problem
11
Issue
Define access scheme to be used at time of
purchase
Solution
An access scheme that adapts dynamically to the
requirements of the data to be transmitted from
remote terminals to hub station

12. 12
What is A-SAT™?
12
Adaptive Satellite Access Technology (A-SAT™)
Adapts to the type of traffic to be transmitted
Can dynamically switch its:
Access SCPC (FDMA) DAMA or MF-TDMA DAMA
Modulation QPSK, 8PSK, etc.
Coding FEC strength (LDPC, TCC) and Coding Rate (1/2,
2/3, ¾, 5/6, etc.)
Latency (64K, 16K, 4K LDPC block sizes vs. TCC)
Encapsulation/Access Scheme in Forward and Return Link

13. 1313
A-SAT™
Features

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A-SAT™ Features
Waveform & Network Topology Adaptability
TDMA
Best bandwidth assignment
efficiency
Flexibility for variable traffic
Voice, VoIP
Web access, etc.
GSM Abis, A-Ter
3G/4G Backhaul
SCPC
Best physical performance
Power-bandwidth efficiency
For difficult and high capacity links
Clear channel E1
Encapsulation Scheme
MPE/MPEG TS; ATM-1, ATM-2; FR/HDLC; GSE

15. 15
A-SAT™ Features
A-SAT™ Network Block Diagram
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16. 16
A-SAT™ Features
High Speed A-SAT™ Terminal
DVB-RCS
MF-TDMA
Modem
Ku-Band
Transceiver
Satellite
Signal Canceller
Option
High Speed
DVB-S2
Modulator
IP Encapsulator
Switch
IP
Ethernet
ASI
Interface
L-Band
L-Band
S6720 High Speed A-SAT IDU
L-Band
Combiner/
Divider
Tx
Sample
L-Band
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135 Mbps DVB-S2 Inbounds (FL)
128 Kbps to 8000 Kbps TDMA (RL)
128 Kbps to 135000 Kbps SCPC (RL)

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A-SAT™ Features
Network Block Diagram
Forward Link
Subsystem
FLS 100
Return Link
Subsystem
RLS 100
SCPC Demod Bank
S6040/AMT 34/
SBD 75e
Network Management System
Router
ForwardLink
Forward LinkM
F-TDM
A
Return
Link
SCPC
Return
Link
MF-TDMAReturnLink
SCPCReturnLink
Forward Link
SCPC Return Link
MF-TDMA Return
Link
Forward Outbound from
Gateway: up to 135 Mbps
Return Inbound MF-TDMA from
Terminal: up to 8 Mbps
Return Inbound SCPC from
Terminal: up to 45 Msps
MF-TDMA/SCPC
High Speed
Terminal
S6720
LAN/WAN
Gateway
MF-TDMA/SCPC
Terminal
S6520
Satellite Signal
Canceller
Option
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18. 18
A-SAT™ Features
Frequency plan is
made up of
building blocks
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Frequency Plan Management
One DVB-S2 forward (outbound) TDM
carrier shared by the terminals
operating in either DVB-RCS MF-TDMA
mode or DVB-S2 SCPC mode
DVB-S2 SCPC inbound carriers (an array
of carriers with defined frequency
composition)
DVB-RCS inbound carriers (an array of
carriers with defined timeslot
composition)

19. 19
A-SAT™ Features
Operational States
TDMA Transmission State
• No/minimal user traffic
• Logged into TDMA network
• Maintains network sync
Request State
• Traffic entering terminal reaches trigger level
• Terminal transmits request to NMS for SCPC carrier assignment
• NMS processes request and assigns SCPC carrier (frequency, symbol rate, etc.)
SCPC Transmission State
• Terminal switches from TDMA to DVB-S2 SCPC transmission
• Terminal transmits data from user data queue until a threshold is met indicating
minimal or no data to be transmitted
• Terminal reverts back to TDMA Transmission State
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20. 2020
A-SAT™
Performance

21. A-SAT™ Performance
Carrier Access Efficiency
Expressed as bits/Hz, i.e.,
throughput achieved in
available bandwidth.
SCPC is very efficient if
carrier is fully utilized. See
figure.
MF-TDMA is more efficient
than SCPC at 50%
utilization or less.
21

22. A-SAT™ Performance
Carrier Access Efficiency
Expressed as bits/Hz, i.e.,
throughput achieved in
available bandwidth.
SCPC is very efficient if
carrier is fully utilized. See
figure.
MF-TDMA is more efficient
than SCPC at 50%
utilization or less.
22

23. A-SAT™ Performance
Carrier Access Efficiency
Expressed as bits/Hz, i.e.,
throughput achieved in
available bandwidth.
SCPC is very efficient if
carrier is fully utilized. See
figure.
MF-TDMA is more efficient
than SCPC at 50%
utilization or less.
23

24. A-SAT™ Performance
Carrier Access Efficiency
Expressed as bits/Hz, i.e.,
throughput achieved in
available bandwidth.
SCPC is very efficient if
carrier is fully utilized. See
figure.
MF-TDMA is more efficient
than SCPC at 50%
utilization or less.
24

25. 25
A-SAT™ Performance
Measures access performance
(bits/Hz) in real networks with
mixed traffic sources
Compares network
throughput to required overall
bandwidth when statistical
multiplexing of incoming
traffic is considered
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Statistical Gain

26. A-SAT™ Performance
Statistical Gain: Ratio of inbound
network throughput to the occupied
bandwidth at various traffic
densities.
Traffic Density: Percentage of
terminal population operating at
peak data rate. Remainder of
terminals operating at average data
rate.
Average Data Rate: Data rate
assumed per terminal averaged
over extended time. Here, average
data rate is assumed to be 20% of
peak data rate.
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27. 27
A-SAT™ Performance
Statistical Gain
Conclusions drawn from chart
Traditional SCPC Bits/Hz Calculation
Assumes 100% Traffic Density
Does not account for typical Traffic Densities less than 100%
In varying traffic profiles equally important is the statistical
multiplexing gain
Considers traffic profile and ability to achieve statistical multiplexing gain of different
waveform/access modes
Achieves superior performance for both SCPC or TDMA
Traffic Density profile is continually changing due to
Applications
Time of the day
Geographical spread
Packet sizes: data or VoIP (Encapsulation)
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28. 28
A-SAT™ Performance
Transponder Lease Costs
Assumes 20 MHz per month for
SCPC as baseline
Assumes $4,000 per MHz per
month
A-SAT always most cost effective
in space segment lease.
Annual savings could exceed
$250K
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29. 29
A-SAT™ Performance
Percentage Improvement over
SCPC-Only Solution
TDMA-only solution not effective
when traffic density exceeds 50%
A-SAT™ solution always better than
or equal to SCPC-only solution
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30. 3030
A-SAT™
Summary

31. A-SAT™ Summary
Technology dynamically adapts the satellite physical link to
maximize efficiency based on application and traffic flow
Statistical multiplexing provides huge gains by sharing bandwidth among many users
Satellite efficiency is optimized using continuous carrier transmission (SCPC)
waveforms, such as DVB-S2 or TCC for low speed, low latency
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TDMA transmissionBurst-like traffic flow
SCPC transmissionConstant traffic flow

32. A-SAT™ Summary
32
Minimizes operation costs
Maximizes satellite
bandwidth efficiency
A-SAT™
Enables dynamic switching
between different access
technologies
Risk mitigated
by adopting a single platform
to efficiently support
changing traffic patterns
without equipment obsolescence

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Thank you!
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For more information please visit:
www.advantechwireless.com