Performance analysis of predictive p-persistent CSMA protocol for control networks

Performance analysis of predictive p-persistent CSMA algorithm, employed in the MAC sublayer of the LonTalk protocol (ANSI/EIA 709.1, ENV 13154-2), designed for local operating networks (LonWorks) has been developed. The simulation approach based on the channel-centric discrete-event method has been chosen. The performance is evaluated on the basis of the most important measures used in random access networks: the channel throughput, the channel capacity, the collision rate and the mean packet delay versus the offered load. The simulation results for collision rate under heavy steady-state load condition confirm the analytical solution based on a probabilistic calculation.