Post on 12-Jun-2018
Multimedia SatelliteTelecommunications
Group
Prof. Michele LuglioIng. Cesare Roseti
Ing. Francesco Zampognaro
www.tlcsat.uniroma2.it
Sample Emulation outputs Real Applications traffic
TCP Reno CWND
Emulator Hardware
DIEDipartimento di Ingegneria
Elettronica
Web Interface
DIEDipartimento di Ingegneria
Elettronica
Cart_
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Cap
abili
ties
Res
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h an
d D
evel
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ent o
f Sol
utio
ns
End to end IP Multimedia traffic
Traffic shaping Deep Packet Inspection
QoS
IPsecTransport layer adaptation Vulnerabilities and countermeasures Key
management DVB RCS encapsulation
Security
ACM Channel modeling Link budget
Physical Layer
DAMA in DVB RCSResource assignement for
multibeam systems
Resource Management
Handover Channel impairments
countermeasures Mobile IP Protocol adaptation
Mobility
Satellite Telecomunications
Course
Teaching and training
Architecture and messaging Joint protocol optimizations
Cross Layer
Traffic analaysisNew web application
assessment Cloud Computing transmission optimization
Future Internet
Research and Development of Solutions
Cap
abili
ties
DIE
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VSAT Networks Heterogeneous networks DTN Emergency communications
Telemedicine Sat WSN
System architecture
Analysis Performance evaluation Design of efficient solutions (TCPN and TCPN+)
PEP
TCP/IP
Satcom Emulator
Orbital tool
Multidimension - Link Budget
NS 2- Simulator
Tools and Facilities
Capabilities
Tests on NS2 and the emulation platform OBP and transparent payloads
Lift Off
Dynamic Traffic shaping through Deep Packet Inspection
Implementation of static and dynamic QoS for satellite segment based on DiffServ
Telesal
Real Multimedia application (VoIP, skype, etc.) testing on the emulator
Key management• Design of efficient key management
system for data security in satellite communications
• Adaptation to DVB CA and IP• Simulations in NS2
Locksat (ESA Innovation Triangle)• LOCal Key Synchronization and generation
for data security in sATellite communications• Security key renewal algorithm with frequent key
renewal without exchanging data messages over the un- secure channel
Satnex Intersection
• Identify and classify vulnerabilitiesof interconnected infrastructures;
• Identify Deploy countermeasures;• Design and implement an integrated
security system;• Identify abnormal elements;• Respond to anomalies;• Provide a mechanism for intrusion prevention
Satellite Vulnerabilities• Identification classification and countermeasures
study (prevention, detection, reaction);• Test bed implementation• Linux implementation
CL- IPsec • IP Sec adaptation to UDP Lite
to provide secure multicastservices over satellite systems
• Linux implementation
Quality of Service
Secu
rity
Qua
lity
of S
ervi
ce
SecurityDIE - Dipartimento di Ingegneria Elettronica
NITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
Emersat
Link Budget (Matlab)• Interface with STK• Updated propagation
models• Complete set
of modulation andcoding schemes
• ACM• OBP and transparent
payloads
Channel modeling(railway environment)
• Simulations in NS2 and Matlab
Physical Layer
Phys
ical
Lay
er
Resource Management
EmersatPilot network set up for Civil Protection needs Network emulation, capacity dimensioning,STK interfacing
SensibleESA Artes 3/4
IP layer bandwidth management
DAMA for DVB- RCSStandards compliant
New algorithms NS2 simulations
Linux implementation
Dynamic efficient
assignment and network
dimensioning in multibeam
systems
Lift OffESA Artes 3/4
C2PDynamic resource management with connection control protocol
Res
ourc
e M
anag
emen
t
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
Cross Layer
Future Internet
Traffic modeling
Satnex III
Testbed set up to assessSPDY protocol performance
New Web traffic analysis
Cloud Computing transmission optimization • TCPN+Priority management at transport layer
Futu
re In
tern
etC
ross
Lay
er
Multiple cross- layer• MAC-PHY-Transport Layer mutual
information exchange for optimal TCPdata transfers
• Simulations in NS2
CAC- TCP in HAPS/Satellite scenario• Simulation
Satnex (I and II) EC FP6• Network of Excellence• 26 partners (DLR coordinator)• Goal: to achieve long- lasting
integration of the Europeanresearch in satellite communicationand to develop a common baseof research knowledge
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
TCP- Noordwijk• New burst- based approach• Outperform current SCPS- TP• Maximization of the capacity utilization, especially for Web- based traffic• Preservation of fairness among flows• Friendliness with TCP Reno
TOPESA Artes 1Develop and prototype a PEP-transportprotocol fully interoperable withSatlabs’ I- PEP specification Interoperable with SCPS- TP Fair sharing among competitive TCP flows Co- existing with UDP flows Compliant with DVB- RCS DAMA Optimized for web browsing applications Delivers short data bursts fast Keeps good performance for longer transfers (images, files)
Satnex IIIESA Adaptation to DTNNetworks
Satnex I and IIComparative Performance Analysis (Reno, Vegas, Westwood, Hybla, Noordwijk)
TCP/IP
Handover• MIP• Transport layer adaptation• Multi segment networks (satellite/terrestrial wireless)
Internet on high speed trains • Architecture definition• Trellis impairments characterization• Transport layer countermeasures• Performance evaluation
Mob
ility
TCP/
IP
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
DIE - Dipartimento di Ingegneria ElettronicaNITEL - Consorzio Nazionale Interuniversitario per i Trasporti e la Logistica
Mobility
Protocol architecture definition: Broadband on Vessels
Interface between ad hoc network and two satellite systems (Globalstar,
Eutelsat) segments for voice and data services
Integration of wireless terrestrial and satellite systems
SavionInterconnecting
ad hoc networks with satellite Emergency
scenario
Interface between analogical PMR
and digital telephony
Satnex IIIDelay Tolerant Networks Wireless
Sensor Networks
ImpulsoSensor Networksfor logistics
CadmoSensor networks for safety/security on public transportation bus
Design of telemedicineand emergency satellitebased architecturesOptimization of networkcapabilities for heterogeneousapplication includingelectroncefalography tranfers
Telesal
Emersat
Syst
em a
rchi
tect
ure
Sensible
System architecture
DIE
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ipar
timen
to d
i Ing
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lettr
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a
N
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- Con
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Inte
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i Tr
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rti e
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ogis
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Syst
em a
rchi
tect
ure
Satellite Telecomunications CourseUp to 50-60 hours class (organized in independent modules)
Adaptable to specific requirements
Main issues
Characteristics and performance of satellite systems
- Integration and Interworking in the Global Information Infrastructure (GII)- Security- Network integration- Examples of satellite systems
• Orbits• Physical layer• Multiple Access• Network issues• Spectrum• Design• Cost
• Equipment• Systems• Services &
applications• DVB RCS systems• Space and ground
segment
Architecture
Teaching and training
Application
Transport
Internet
Data link
Physical
Teac
hing
and
trai
ning
DIE
- D
ipar
timen
to d
i Ing
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lettr
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a
N
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- Con
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nale
Inte
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vers
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i Tr
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rti e
la L
ogis
tica
Telecommunication networks
• Introduction to communication networks• Basics on communication mechanisms
and protocols• Network architectures• Internet and the WWW• TCP/IP stacks• Web 2.0 and HTML5
Laboratory of Signal transmissions
• Signal generalities• Basics on Matlab programming• Signal sampling• Sampling applications• Discrete signal convolution• FFT• Signal processing
Broadcast communications (Transmission of Multimedia Data)• A brief history of the TV• Digital TV Systems• The MPEG Data Stream• IP Multimedia Subsystem (IMS)• IP TV• IPTV Functional Architecture• Cloud applications• IP Multicast
Telecommunications Fundamentals
Deterministic continuous-time signals
• Telecommunication systemsand services
• Definition of signals and idealtransmission
• Representation of signals in timeand frequency domain
• Affinity: cross correlationand autocorrelation between energyand power signals
• Linear and time invariant transformationbetween signals and linear time invariantsystems
• Multiplexing, analogue digital conversion,basics on channel coding, basicson modulation
Time continuous random variables and stochastic processes
• Random variables theory
• Stochastic processes, generalities,properties and moments
• Gaussian stationary noise not in baseband, white Gaussian noise in the signalspace
• Markov processes: properties,continuous and discrete time
Teaching and training
Teac
hing
and
trai
ning
DIE
- D
ipar
timen
to d
i Ing
egne
ria E
lettr
onic
a
N
ITEL
- Con
sorz
io N
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nale
Inte
runi
vers
itario
per
i Tr
aspo
rti e
la L
ogis
tica
Simulation activity
SatCom Emulator: configuration
Key features and standards supported
Satellite constellation tool Developed to perform analysis of satellite constellations.Able to evaluate coverage areas, delay, with extremely flexible capabilities to vary input parameters such as: orbit configuration (altitude, elevation, number of satellites), antenna patterns, user distribution on ground
Also able to implement and perform evaluations on double orbit constellations (composed of both LEO and GEO components). Hybrid constellations architecture foresees a bi directional communication with high capacity link between Earth Terminal (ET) and LEO satellites, which exchanges data with the GEO component, which exchanges data with the end user through the gateway and the terrestrial network.
For the hybrid architecture, it is possible to evaluate the visibility time (in term of cumulative distribu-tion and average value) and the amount of data transferred between the network elements. The hybrid configuration can include more LEO satellites and more GEO satellites (interconnected through IOL) ac-cording to the service and traffic requirements.
The tool is integrated in the network emulation platform.
Link budget tool Realized in Matlab is able to perform a multi- dimensional satellite link budget for tran-sponders (transparent and regenerative) operating in K (Ku/Ka) and EHF band for different communication sat-ellite scenarios (TV broad-casting, telemedicine, emer-gency scenarios, and others scenarios).
The LBT is able to be integrated into a confederation of simulators, such as STK (Satellite Tool Kit) tool, Satellite Network Emulator Platform, and external propagation models to realize a complex link budget calculator.
Considering a propagation model as external software, the output can be the antenna temperature and/or the total attenuation evaluated on the basis of the ITU models implemented in the own external software. These inputs drive the LBT to perform its functionality, to obtain link budget results. It is possi-ble to manage the LBT functionalities, thanks to a graphical user interface.
SatCom Emulator: description • Design and realization of PC/Linux based emulation platform• Real time operation • Star/mesh topology • Centralized control/management • Interfaced with real networks (Internet, WiFi, GSM, WiMax, etc.) • Interconnection with other test beds
• DVB- RCS2 access scheme has been implemented as core functionality of NS2 (satlink.cc)• Combinations of CRA, RBDC and VBDC or Random Access request schemes are available• Capacity: 2Mbit/s for Return and 10 Mbit/s for the Forward Link• TCP- Newreno is used as transport protocol over the satellite link
DIEDipartimento di Ingegneria
Elettronica
NITELConsorzio Nazionale
Interuniversitario per i Trasporti e la Logistica
Communication • Broadband mesh or star architecture • Simulation of narrow band and LEO links• Real IPv4/6 for uni-multicast/broadcast• Multiple Virtual Satellite Terminals• NAT or direct addressing of Virtual Sat Terminals• Acceleration with PEP selecting TCP versions• Fine tuning of SAT terminals profiles• Several Bandwidth Allocation Algorithms • Layer 3 (and above) security frameworks
(e.g.OpenVPN)• Connection Control Protocol C2P for resources
on demand
Error models• Quasi-Error Free (QEF) channel• Error distribution at the IP level (Ka/Ku bands)• Plug-in for custom error models and external
tools
Forward Link Characteristics• Adjustable maximum rate for broadcast channel• DiffServ profile for fwd link priority multiplexing• Multi spot support through separated subnets
Return Link Access Characteristics• Terminal login and synchronization• Fixed or variable bandwidth allocation:
• Constant (session-based pre-assignment or SCPC)• Dynamic (superframe-based BoD/DAMA)
• DiffServ to MAC mapping for fine-tuned QoS
External Interfaces• Web configuration and test execution GUIs• Real time probes for system monitoring• IP tunnel endpoints for remote connectivity to
other testbeds• VLAN switch for HW and 3rd parties testbeds
local interconnections• XML over TCP interface for configuration
and scenario updates
Simulation activity
SatCom Emulator: configuration
Key features and standards supported
Satellite constellation tool Developed to perform analysis of satellite constellations.Able to evaluate coverage areas, delay, with extremely flexible capabilities to vary input parameters such as: orbit configuration (altitude, elevation, number of satellites), antenna patterns, user distribution on ground
Also able to implement and perform evaluations on double orbit constellations (composed of both LEOand GEO components). Hybrid constellations architecture foresees a bi directional communication withhigh capacity link between Earth Terminal (ET) and LEO satellites, which exchanges data with the GEOcomponent, which exchanges data with the end user through the gateway and the terrestrial network.
For the hybrid architecture, it is possible to evaluate the visibility time (in term of cumulative distribu-tion and average value) and the amount of data transferred between the network elements. The hybrid configuration can include more LEO satellites and more GEO satellites (interconnected through IOL) ac-cording to the service and traffic requirements.
The tool is integrated in the network emulation platform.
Link budget tool Realized in Matlab is able toperform a multi-dimensionalsatellite link budget for tran-sponders (transparent andregenerative) operating in K(Ku/Ka) and EHF band fordifferent communication sat-ellite scenarios (TV broad-casting, telemedicine, emer-gency scenarios, and othersscenarios).
The LBT is able to be integrated into a confederation of simulators, such as STK (Satellite Tool Kit) tool, Satellite Network Emulator Platform, and external propagation models to realize a complex link budget calculator.
Considering a propagation model as external software, the output can be the antenna temperature and/or the total attenuation evaluated on the basis of the ITU models implemented in the own external software. These inputs drive the LBT to perform its functionality, to obtain link budget results. It is possi-ble to manage the LBT functionalities, thanks to a graphical user interface.
SatCom Emulator: description • Design and realization of PC/Linux based emulation platform• Real time operation• Star/mesh topology• Centralized control/management• Interfaced with real networks (Internet, WiFi, GSM, WiMax, etc.)• Interconnection with other test beds
• DVB- RCS2 access scheme has been implemented as core functionality of NS2 (satlink.cc)• Combinations of CRA, RBDC and VBDC or Random Access request schemes are available• Capacity: 2Mbit/s for Return and 10 Mbit/s for the Forward Link• TCP- Newreno is used as transport protocol over the satellite link
Communication • Broadband mesh or star architecture• Simulation of narrow band and LEO links• Real IPv4/6 for uni-multicast/broadcast• Multiple Virtual Satellite Terminals• NAT or direct addressing of Virtual Sat Terminals• Acceleration with PEP selecting TCP versions• Fine tuning of SAT terminals profiles• Several Bandwidth Allocation Algorithms• Layer 3 (and above) security frameworks
(e.g.OpenVPN)• Connection Control Protocol C2P for resources
on demand
Error models• Quasi-Error Free (QEF) channel• Error distribution at the IP level (Ka/Ku bands)• Plug-in for custom error models and external
tools
Forward Link Characteristics• Adjustable maximum rate for broadcast channel• DiffServ profile for fwd link priority multiplexing• Multi spot support through separated subnets
Return Link Access Characteristics• Terminal login and synchronization• Fixed or variable bandwidth allocation:
• Constant (session-based pre-assignment or SCPC)• Dynamic (superframe-based BoD/DAMA)
• DiffServ to MAC mapping for fine-tuned QoS
External Interfaces• Web configuration and test execution GUIs• Real time probes for system monitoring• IP tunnel endpoints for remote connectivity to
other testbeds• VLAN switch for HW and 3rd parties testbeds
local interconnections• XML over TCP interface for configuration
and scenario updates
Multimedia SatelliteTelecommunications
Group
Prof. Michele LuglioIng. Cesare Roseti
Ing. Francesco Zampognaro
www.tlcsat.uniroma2.it
Sample Emulation outputs Real Applications traffic
TCP Reno CWND
Emulator Hardware
DIEDipartimento di Ingegneria
Elettronica
Web Interface
DIEDipartimento di Ingegneria
Elettronica