Diffserv Dynamic Priority Queue Achieved

The traditional IP network is an oriented connected network, it does not provider the quality of service (QoS) guarantees for network application, but provides a "do one's best" network services. With the rapid development of Internet technology and the rapid emergence of various real-time applications, such as IP telephone, video conference, video on demand, these applications have high request for real-time, end-to-end delay and bandwidth. So the key of research of IP network is that how to distribute cyber source reasonably and improve service quality. The main research work is as follows:Firstly, competition access mechanism used in the common queue scheduling mechanism is discussed in detail and summary, detailly analysis the advantages and disadvantages of the scheduling mechanism. I obtain the analytic expression of the priority queue for each information packet average length of queue and the average of waiting time through mathematical analysis and deduction on the non preemptive priority scheduling policy.The preemptive priority scheduling strategy is insufficient, combining analytic hierarchy process analysis to differentiate services based dynamic priority queue, obtain selection decision strategy of priority and length of queue of the dynamic priority queue system in the whole system evaluation system.The paper based on non-preemptive priority scheduling strategy and based on differentiated services of dynamic priority scheduling strategy, simulate and compare the program performance, Indicate that based on differentiated service dynamic priority scheduling strategy is better in the average waiting time.