Abstract: A channel emulator generates radio channel conditions of live cellular base station signals in a simulation of a radio environment of a fielded cellular network, based on a record of captured radio signal data of a plurality of cellular base stations in the fielded cellular network. A generates a simulation of a fielded cellular network. In one aspect, the radio channel conditions in the simulation of the radio environment are synchronized with events in the simulation of the fielded cellular network. In another aspect, an event handling state machine directs configurable events in the simulation of the fielded cellular network in response to radio channel conditions in the simulation of the radio environment.