关键词: 排队 优先级 丢包率 QoS

Abstract:

According to the queueing theory and practical applications, this paper conducts the quantitative analysis and study on cell scheduling strategies of   priority class. After these , we derive the formula of the average cell delay and the cell loss ratio. Through computer simulation and contrastive analsis, we conclude that we must enhance the cell service ratio when we want to reduce the average cell delay and the cell loss ratio. Based on the formula ,we can also determine the cell service ratio which curbs the average cell delay and the cell loss ratio in the permissive range. Furthermore, we deduce the situation with more priority classes. We can say that, this analytical approach in this paper overcomes the calculation complexity of the probabili ty generation function approach and numerical methods.

Key words: （queue, priority class, cell loss mtio, QoS）