摘要：Different from synchronous mode, asynchronous p-CSMA has no timeslot. As a result, the propagation delay between nodes can not be ignored and will have heavy effect on the probability of packets collision. From the view of the packets collision, the paper for the first time establishes a preemptive asynchronous p-CSMA probability model with consideration of the propagation delay and reveals the essence of interaction within multi-nodes. The network performance can be evaluated through the targets of throughput and packets delay with the probability model. Based on a typical asynchronous p-CSMA network -- VDL2, simulations are also carried out to verify the correctness of this model in this paper. Finally, trends of key targets are given.
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