CSMa/CD with two persistence factors: a unified performance model for CSMA/CD

Abstract

CSMA/CD (carrier-sense multiple-access with collision detection) protocols with two persistence factors is presented. One factor is used to define the protocol action if a station becomes ready when the channel is busy, and the other one is the normal persistence factor used to determine transmission rights. A family of new protocols is described which corresponds to different values of the persistence factors. The performance model of this protocol also acts as a unified performance model for the slotted CSMA/CD protocol with finite population. The non-persistent, 1-persistent and p-persistent variants of the CSMA/CD protocol can all be modeled as special cases of this general model. In addition to average performance measures, the output process and the packet delay time distributions are evaluated.<>