Synchronous vs Asynchronous calls and Flow Control for HLA 4

Abstract: HLA is a standard for distributed simulations where many small simulations connect to each other to create a bigger simulation. As networking technologies have evolved the requirements for the simulations. This includes running certain simulations to communicate over Wide Area, 4G, and 5G networks. The Federate Protocol has been purposed as a solution giving the simulations a client-server model. Currently simulations send requests and wait for the responses which results in performance losses as the simulation waits for the Round Trip of the request. Therefore an Asynchronous solution has been purposed to solve this performance issue. To make sure the simulations do not send to many requests and overwhelm the server Flow Control is needed. This paper will compare the performance of Synchronous and Asynchronous modes and look at what kinds of Flow Control methods can be used and their behaviors