Networked Simulation with Hla and Modsim

This paper describes a networked simulation application using HLA (The High Level Architecture) and MODSIM III, a commercial off-the-shelf (COTS) object-oriented simulation language. The Department of Defense (DoD) developed HLA for training simulation exercises, but HLA is applicable to a wide range of simulation work far beyond wargames. HLA is documented in terms of C++ and Java while Discrete-Event Simulations are often developed in a simulation language such as MODSIM III, SIMSCRIPT II.5, or SLX, or by using a graphical, domain-specific simulator such as COMNET III, SIMPROCESS or ProModel. The requirement addressed by this paper is to interface an existing Discrete-Event Simulation model to the HLA, in order to evaluate that task and to set directions for future work. To further direct focus on interfaces between HLA and a Discrete-Event Simulation, we deliberately chose a small simulation application developed in MODSIM III. Real simulations are, of course, more detailed, but will still use the same interfaces.