Systems of Systems Simulation using the High Level Architecture

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Systems of Systems Simulation using the High
Level Architecture

• Anthony Cramp

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Introduction

• Systems of Systems Simulation
• High Level Architecture
• Case Study Virtual Election
• Problems
• Solutions
• Local Data Filtering
• Data Distribution Management
• Federation Communities
• Performance
• Future

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Systems of Systems Simulation

• Simulation A computation that models a real or
  imagined system over time
• Systems of Systems Simulation Simulation of a
  system via the collaboration of the simulations
  of the systems subcomponents
• Potentially hierarchical
• Natural mapping to distributed simulation

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High Level Architecture (HLA)

• Framework allowing distributed simulation
• Complete simulation termed a federation
• Individual simulation components termed federates
• Distributed simulation services provided by a
  Runtime Infrastructure (RTI)
• Simulation data documented in a Federation Object
  Model (FOM)
• Object Classes (things with persistance)
• Interaction Classes (things that are transient)

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Case Study Federal Election

• Election of the Australian Federal Government
  resembles a system of systems process
• Politically, Australia is subdivided into
  geographics regions called electorates
• Registered voters cast votes for candidates
  standing for an electorate
• Votes are cast at ballot stations
• Local votes
• Absentee votes
• Candidates have a party affiliation or are
  independent
• The party, or coalition of parties, holding a
  majority of electorates forms government

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Virtual Election

• Federates representing Ballot Stations
• Simulate the casting of votes
• Participate in the vote tallying for an
  electorate
• Federates representing Electorates
• Receive absentee votes
• Coordinate the vote tallying for the electorate
• Report results of the electorate
• Federate representing the Election
• Receive electorate results
• Compile and report election results

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Virtual Election
Ballot Station
Electorate
Election
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Virtual Election Data

• Inter-system data
• Absentee votes
• Electorate results
• Election results
• Intra-system data
• Ballot station information
• Messages related to tallying electorate votes

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Problem Multiple Systems per Federation
Solid lines represent inter-system data Dashed
lines represent intra-system data
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Solution Local Data Filtering

• Augment intra-system information with a system
  identifier
• Virtual Election
• System identifier is the name of the electorate
• Data model augmented with the electorate name

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Solution Local Data Filtering
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Solution Data Distribution Management

• Allows definition of routing spaces which are
  partitioned based on simulation requirements
• Routing spaces defined by dimensions
• Partitions are termed regions
• Regions defined by extents of dimensions
• Virtual Election
• Define routing space that spans the electorates
• Single dimension spanning the electorates
• Regions defined per electorate
• Intra-system data sent via the electorate regions

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Solution Data Distribution Management
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Solution Federation Communities

• Grouping of federations and RTIs working together
  to achieve a common goal
• Single federation simulates a single system
• Multi-system simulation enabled via
  interoperation of multiple federations
• Virtual Election
• Single electorate per federation
• Data model of each federation same as for the
  general case
• Data model for the federation interconnect
  consists of just the inter-system data

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Solution Federation Communities
System 1
RTI 1
Interconnect
RTI 2
System 2
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Performance

• Qualitative Performance
• Programming Complexity
• Architecture Complexity

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Future

• Quantitative Performance
• Simulation Speed
• Network Utilisation
• Local Area
• Wide Area
• Second Case Study Virtual Maritime System

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Questions
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