A Collision Avoidance Protocol for Supporting All-Optical Ring Network

Recently, the number of multimedia applications in the Internet has grown enormously, and massive IP packets of variable-length are being made. There is a vast bandwidth requirement at the backbone network, such as wavelength division multiplexing (WDM) metro ring networks, to satisfy the demand; however, most of the current WDM metro ring networks are ineffective or complex. We propose a simple and effective MAC protocol named carrier senses multiple access with idle detection (CSMA/ID) to handle variable-length packets over an all-optical metro ring network. For numerically evaluating performance, an analytical model was developed by pre-classification queue with weighted round robin (PCQ_WRR) architecture and random algorithm. Further, there are two kinds of different MAC protocols: CSMA/CP and CSMA/ID are also examined and compared. By the simulation results show that our protocol has better throughput than CSMA/CA and CSMA/CP protocols under symmetric load on all-optical ring networks.