Performance Analysis Of A CSMA/CD With Prioritized Access Waiting Time
Zai-ming Shen, S. Muro, Takatoshi Hasegawa · 2005
We propose a new CSMA/CD protocol with priority called PW-CSMA/CD. In the PW-CSMA/CD, the prioritized scheme is realized by introducing the basic access waiting time such that the higher the priority level of message packets, the shorter the access waiting time. Characteristics of the PWCSMA/CD such as the average throughput and the number of times of retransmission, are theoretically analyzed. Compared to the original CSMA/CD, the obtained results for the PW-CSMA/CD show that the number of times of retransmission of highly prioritized packets is remarkably reduced for every t hroughput value and is also reduced to some extent for the case of packets with low priority. The mechanism and performance of the PW-CSMA/CD are further compared with those of the Priority Ethernet which is another CSMA/CD protocol with priority.