Abstract
Degano et al. (1989) introduced AC/E systems (augmented C/E systems) to give a true concurrency semantics to CCS. But the true concurrency was not complete. There was no true concurrency for recursive agents (like < x>. e 1| e 2) and nondeterminant agents (like e 1| e 2+ e 3| e 4). Also the concept of bisimulation has not been transplanted to AC/E systems. This paper defines a complete true concurrency model of CCS by exploiting the potential concurrency of any CCS agent to its full strength. It introduces a kind of multilayered Petri nets, called NP/R nets, to define the processes on AC/E systems. We also introduced the notion of bisimulation of groups of NP/R nets and proved that this bisimulation relation can determine the CCS bisimulation uniquely.
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