HLA-based Adaptive Distributed Simulation of Wireless Mobile Systems
Proceedings of the seventeenth workshop on Parallel and distributed simulation
Application of the RESTART/Splitting technique to network resilience studies in NS2
MS '08 Proceedings of the 19th IASTED International Conference on Modelling and Simulation
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The design and engineering of networks requires theconsideration of many possible configurations (differentnetwork topologies, bandwidths, traffic and policies). Networkengineers may use network simulation to evaluatechanges in network configuration; but detailed, packet-levelsimulation of many alternatives would be extremely timeconsuming. This paper introduces the concept of scenariopre-filtering rather than perform detailed simulation ofeach scenario, we propose to quickly evaluate (pre-filter)all scenarios in order to select only the relevant scenarios,and discard those that are clearly too over- or under-provisioned.To rapidly evaluate scenarios, we have developedseveral new analytical techniques to quickly determinethe steady-state behavior of the network with bothbulk and short term TCP ows. These techniques applyto arbitrary topologies and routers that use both drop-tailand RED queuing policies. Since we are only interestedin selecting the interesting scenarios for detailed simulation,the answers need only be approximate. However, weshow that accuracy is typically within 10% of detailed simulation.More importantly, these techniques are 10 300 脳faster than detailed simulation, and, hence, pre-filtering isa promising technique to reduce the total simulation timewhen many scenarios must be considered.