The Simulation Research Based On A Novel CSMA/CD Protocol

Carrier Sense Media Access (CSMA) protocol is a widely used algorithm to control the access of a computer to the shared media channel. There are several variants derived from this Media Access Control (MAC) method, such as non-persistent CSMA, 1-persistent CSMA, and p-persistent CSMA etc. These algorithms are successful in low load network, such as the CSMA/CD protocol used in Ethernet, but in the high load system, they are no longer adequate.To meet the high load requirements, this dissertation proposed a novel CSMA/CD algorithm, the dynamic Predictive P-Persistent CSMA/CD protocol. The main work and research in this dissertation includes three hereinafter aspects:(1) Introducing the development and drawback of the CSMA/CD protocol, studying on the solution for this drawback: CSMA/CD-DCR, CSMA/CD-MDCR, the solution Based on switches, the solution Based on prolonging the jam size. Anatomizing the drawback and excellence of these four solutions.(2) Studying on how to create network models and execute simulation under the Modeler, and setting up the respective network model of ALOHA protocol, CSMA protocol, and CSMA/CD protocol. Consequently , executing the model and analyzing the performance of correspond with its protocol.(3) As a solution to the problem of the standard CSMA/CD protocol, the paper propose a dynamic and predictive p-persistent CSMA/CD algorithm, which can dynamically adjust the probability of sending data according to the load of network. Integrated the standard CSMA/CD protocol with the dynamic and predictive p-persistent protocol, this article propose a novel CSMA/CD protocol. Extensive simulation studies by comparing the novel CSMA/CD protocol with the standard CSMA/CD protocol. The simulation results indicate the superiority of the proposed protocol.