The document discusses the evolution of simulation standards, highlighting the transition from early distributed simulations developed by DARPA to the advanced integration of HLA and DDS standards for real-time data performance. Simware HLA RTI combines the capabilities of HLA with DDS, providing enhanced performance, reliability, and interoperability without the need for gateways. It emphasizes the importance of quality of service in data communication for heterogeneous networks.

1. SimWare HLA RTI: the next frontier

2. Evolution of standards in simulation
• First Distributed Simulation for US Army.
SIMNET • Developed by DARPA in the 80’s. 1980s
•Based on SIMNET
DIS •NATO standard (STANAG 4482) until 2010, IEEE 1278 standard 1990s
• IEEE 1516 standard since 2000
HLA • NATO standard (STANAG 4603) 1990s
• HLA evolution for Test and training ranges.
TENA • Design to improve reliability, interoperability and performance over HLA 2000s
•Service-oriented paradigm. Provide some level of service even in unreliable
communication networks
CTIA • Advanced service capabilities. Developed by Looked Martin 2000s
• Convergence of services between HLA, TENA and CTIA
THE
FUTURE • Common object model, Common interoperability mechanism, Security requirements ????

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

5. OMG DDS: a perfect complement to HLA
 Designed for Real Time Data
performance.
 The Wire Protocol is part of the
standard (DDSi).
 Great scalability: from parallel
computing to large scale
networks.
 Offers a complete suite (22) of
QoS for the spatial and time
managing in data distribution.
 Very Low and predictable
latencies.
 Built-in robustness for fault
tolerance
 Plug&Play capabilities.
 Security standard

6. DDS: Data Distribution Service
DDS is a suit of standards of the
OMG
 DDS provides and manages real
time comunication based on
publication and subscription
 Architecture is based on data
diffusion. Data are based on the
net. There is no data coupling.
 For controlling the details of the
communication it has 22 quality
of services (QoS)

7. The OMG Data Distribution Service (DDS)
• DDS v1.2 API Standard
Language Independent, OS and HW
architecture independent
– DCPS. Standard API for Data-
Centric, Topic-Based, Real-Time
Publish/Subscribe
– DLRL. Standard API for creating
Object Views out of collection of
Topics
• DDSI/RTPS v2.1 Wire Protocol
Standard
– Standard wire protocol allowing
interoperability between different
implementations of the DDS
standard
– Interoperability demonstrated
among key DDS vendors since
2009

8. Global data space
 All communication is data decoupled: participants only need to know the data they
want to send to the net –publish- and the data they want to receive –subscribe-.
 Don t know previously who is sending or receiving these data
 Don t know when these data will arrive
 Publishers and subscribers are adjusted automatically and dinamically by DDS
dynamic discovery
Data space

9. Quality of services (QoS)
 Are communication qualities,
characteristics associated with the
distribution of information. There are
four general categories:
o Control of local resources.
o Spatial control of the data distribution.
o Lifecycle information.
o Time-related characteristics of the
information.
 Many QoS are adjusted according to a
model of supply and demand.
Subscribers request a minimum quality
and the publishers offer a quality when
sending. If both coincide, data is
received.

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 HLA 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

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