Simware RTI Empowering hla with dds

HLA
DDS
What is HLA raised to the power of DDS?

SimWare RTI
Empowering HLA with
DDS

Confidential
3
© NEXTEL AEROSPACE DEFENCE & SECURITY S.L., 2014.
Reservados todos los derechos / All Rights Reserved
José Ramón Martínez
MSc Industrial Engineering
International Presales Director
NADS
Speaker
jrmartinez@nads.es
Camino Cerro de los Gamos,1
Edificio Negocenter
Pozuelo de Alarcón 28224
Madrid [SPAIN]
www.nads.es // www.simware.es

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SimWare portfolio

AGENDA
 Introduction
 How to evolve HLA
 Use case
 Future evolution of SimWare RTI
 How to get SimWare RTI
Total time 45 minutes

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Evolution of standards in simulation
SIMNET
• First Distributed Simulation for US Army.
• Developed by DARPA in the 80’s.
DIS
• Based on SIMNET
• IEEE 1278 std; NATO standard (STANAG 4482) until 2010
HLA
• Born in the 90’s
• IEEE 1516 standard since 2000
• NATO standard (STANAG 4603)
TENA
• HLA evolution for Test and training ranges.
• Design to improve reliability, interoperability and
performance over HLA
• An US DoD standard only
1980s
1990s
1990s
2000s

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HLA rationale
HLA was created as an answer to DIS limitations and an
evolution of it
• Common data
model
• Any time
representation
• Net is used under
demand and a
bare minimum
• …
Requirement DIS HLA
Create a distributed
simulation, allow
systems to join
Limited Yes
Support publish
and subscribe
information
management
No. Must support
either multicast,
broadcast, or
unicast packets
Dynamic
Transport Type Best effort Best effort and
reliable
Support multiple
message types
Limited Supports
interactions
and state
updates

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But DIS is still in use
DIS was retired in favour of HLA in 1998
Hasn´t been NATO standard since 2010
• But is still evolving:
DIS 7
• Still one the most
used standard

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Why is DIS still in use?
• Simplicity and Flexibility:
• Data model
distribution
• Fault tolerance
• HLA is used for standalone and distributed locally
• But… in distributed simulation over wide areas
• DMO uses DIS for real distribution
• HLA is used only in experiments/experiences

How to evolve HLA:
keeping it as is

Comparison of DDS and HLA standards
[Source 12F-SIW-027]
Very useful for
simulation
Useful for data
interoperability
Useful for
modularity
Simulation specific
services
Useful for live
simulation

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Two approaches to DDS vs HLA
• HLA has simulation services
• DDS has features for real time communication
Change HLA by DDS
SimWare
Framework Use DDS as HLA RTI
SimWare RTI

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 Started in 2011
 HLA Run Time Infrastructure designed for
real time performance in large federations
 IEEE 1516 HLA API for virtual and live
simulations
 Use DDS for Data Distribution: functionality
of an HLA RTI with the features,
performance, power and reliability of OMG
DDS standard
 Full HLA services support as required in
virtual & live simulations
SimWare RTI : The first RTI to join DDS with HLA RTI

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SimWare RTI rationale
Our HLA implementation is different in just one little
thing: we use DDS for the communication layer
COMMUNICATION
LAYER
HLA
SERVICES&API

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The reasons I: Use
of communication
HLA is good in local and small scenarios
But is not so good in distribution and heterogeneous
nets
 It tries to use net as less as possible: e.g. Can
update under demand
DDS is a pure communication standard
 Communication is running all the time
 DDS layer keeps communication going
 Communication is transparent to user

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The reasons II : Use of QoS
HLA simply can not control if data are properly
delivered
 You can decide some properties
 No guarantee
DDS is a centered in guaranteeing data delivery
 QoS referred to local resources
 QoS that affect side to side communication:
Control of data distribution

Peering inside QoS
Spatial control of data
• How data are delivered
 Reliable / best effort, order, redundancy ...
Time control of data
• Temporal determinism
 Latency
 Prioritization ...
• Data availability
 How long data are available on the
system.
 History, durability, etc ...
Resource Control
• Resources are limited
• Performance differences btw systems
Some QoS are applied per instance, others are
general

Changing QoS
You can change
general QoS for the
entire
communication
domain
You can change QoS
for the publishers and
subscribers
Changing QoS just by changing XML files

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The reasons III : Ad hoc solutions vs. standards
HLA uses solutions for LAN requisites
 Each vendor has its methods
 Solutions are particular and difficult to generalize
DDS is a standard
 Can be as good as ad hoc solutions
 Is much better in complex scenarios

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The reasons IV: DDS is open [DDSI]
One of the drawbacks of traditional HLA approaches is
that each vendor cannot communicate with the rest
(ok, by using gateways!)
DDS uses DDSI for interoperation between every vendor
1 2 3
4 5 6 7

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The reasons V: Used in action
SimWare RTI has been
used for connecting HLA
COTS like VRForces, VBS2
and Stage
Every kind of net has
been used: LAN, WIFI,
WAN
We can use any medium
where TCP-IP is available:
e.g. WebSockets in
browsers, Android, etc.

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Real case I: Rome to Madrid
We use SimWare RTI in our connection between
Rome and Madrid: 1300 km as the crow flies
Problems to solve were related with QoS, not with
code
• For each instance:
• Deciding reliability and persistence
• For the entire connection:
• Setting general QoS in terms of Resolution,
Partitions, Retries, etc.

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Real case II: Rome to Madrid
Two phases connection
• Over Public networks
 Latency changed wildly: 400-1200 ms
 QoS was established and RTI reached
 It was difficult to guarantee one configuration
valid for all latencies
• Over dedicated VPN
 Latency was more stable
 QoS were set and RTI reached
SAME SimWare RTI, SAME federates connecting, ONLY QoS
changed

Future evolution of
SimWare RTI

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Evolution of SimWare RTI
SimWare RTI is evolving
• Creating HLA-Evolved API
• Using DDS security layer: using the standard to
have MLS
• QoS predefined profiles

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SimWare RTI towards LSA
SimWare RTI future evolution goes towards LSA:
• New developments in model reusability
• Distribution of data model
• Open services layer
• DDS standard for security

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LSA: evolution without revolution

How to get
SimWare RTI:
get it for free

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SimWare RTI
• SimWare RTI can be obtained for free
 Up to 4 federates
 Every single feature included
 No time limit
Send us an email: info@nads.es
Or read more in: www.simware.es
HLA
DDS

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Versions, versions, versions
SimWare RTI comes in different versions
 32 bits
 64 bits
 Linux
 Windows
• Vs 2005/2008/2010
• Non-secure/secure SCL

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SimWare RTI Pro: Going Pro
• SimWare RTI Pro just in case you need more
 No limit of federates
 Full support
Send us an email: info@nads.es
Or read more in: www.simware.es
HLA
DDS

Please address any questions about this presentation to:
José Ramón Martínez Salio
Technical Presales Director
jrmartinez@nads.es
@NADS_news /NEXTELADS Nextel Aerospacejrmses

Simware RTI Empowering hla with dds

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