The document discusses the integration of High-Level Architecture (HLA) and Data Distribution Service (DDS) in simulation environments, highlighting their respective strengths and limitations. While HLA is a widely accepted standard for interoperable simulators, it faces challenges in scalability, performance, and security, whereas DDS excels in real-time data distribution and fault tolerance. Simware RTI combines these frameworks, offering enhanced capabilities for simulators with improved communication and no need for gateways.

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

2. SimWare RTI
where HLA meets DDS

3. Simulation today: Use of different standards
 HLA and DIS cover more than the 70%
TENA of the demand. Both are standards
OO design embraced by IEEE and SISO and
Information management known worldwide
Ownership
transfer  These architectures have significant
Save & Restore
overlap in capabilities and
Initialize a Pass interactions requirements
federation
DIS
QOS Support
options Multiple message types
Resign Unreliable
Synchronize Networks
Event CTIA
ordering
Persistent
HLA Database

4. An assessment of HLA present capabilities
 Wire protocol does not exist
 A IEEE and NATO (Stanag 4603)
standards  The entire standard tries to
limit communication
 An accepted standard for
interoperating simulators  QoS are very limited.
 Has meta-data model (OMT)  Lack of plug&play capacities.
 Define rules for interoperability  Performance is not enough for
massive data distribution
 Many COTS from different across heterogeneous
vendors networks.
 Services are part of HLA  API is hard to use
 No security standard
 Model is rigid

5. Meet DDS
in simulation

6. DDS was born in 2003 as the real time backbone in Frigates…
… has now a full spectrum of applications
DDS en otros ámbitos industriales
– In simulation
– In RTES
– In Scada
– In Smart grids
Real time systems in
– In BI
Frigates
– In Medicine
2003 2012

7. Why use DDS in Simulation?
Data
Data
COMMUNICATION Write
r
Reader
Data Data
Write Reader
r
• DDS is centered in controlling the TOPIC “D”
Data
TOPIC “A”
communication Write
r Data
[DDS Global Data Space] Reader
• HLA tries to minimize the TOPIC “B”
communication. It cannot control it Data
TOPIC “C” Data
Write
•
Write
DIS trust the communication r
r
SCALABILITY and FAULT TOLERANCE
• DDS has automatic discovery, is fully
publish-subscriber, no single point of
failure
• HLA is central server based: scalability
and fault tolerance are difficult

8. Why use DDS in Simulation?
LESS-THAN-PERFECT COMMUNICATIONS
• DDS has been proved over small
bandwidth (4800 bps in digital network
radios)
• DDS can cope with heterogeneous
networks
REAL TIME SIMULATION
• Military platforms use DDS as the
communication backbone
• Simulating with DDS can incorporate
this data in real time

9. When worlds collide

10. HLA and DDS; DDS and HLA: the odd couple?
SimWare has put
together the
simulation stardard
–HLA- plus the best
communication in
real time –DDS-
The result is called
SimWare RTI

11. SimWare RTI : The first RTI to join DDS with HLA RTI
 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
 No gateways needed to connect HLA to DDS
 Full HLA services support as required in virtual & live
simulations :
 federation management
 declaration management
 object management
 ownership management

12. Try now SimWare RTI 1.2!!!
• Includes complete SimWare 4.2
• Also include the new SimWare RTI 1.2; HLA running over DDS
without data bridges

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