SimWare Rti: HLA raised to the power of DDS
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This document compares and contrasts the High Level Architecture (HLA) and Data Distribution Service (DDS) standards for distributed simulation. It notes that HLA focuses on minimizing communication while DDS actively controls communication through its global data space and publish-subscribe model. The document then introduces SimWare RTI, which combines HLA services with DDS communication capabilities to leverage the benefits of both standards for real-time performance in large simulations over heterogeneous networks.
![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
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• HLA tries to minimize the TOPIC “B”
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TOPIC “C” Data
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•
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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](https://image.slidesharecdn.com/simwarertiwebinar-121220055649-phpapp02/85/SimWare-Rti-HLA-raised-to-the-power-of-DDS-7-320.jpg)
SimWare Rti: HLA raised to the power of DDS
- 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
- 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
- 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