基于门限优先级的业务模型及性能仿真分析

随着网络访问用户的增加，如何合理分配网络资源，减少网络通信阻塞具有十分重要的意义。该文运用了排队理论对门限优先的业务进行了分析，建立了数学模型。利用排队模型，通过计算机仿真对门限优先业务中门限不同对两类信元的平均逗留时间、信元丢失率的影响进行了分析。结果表明如果门限值选取适当，门限优先级策略降低了高优先级信元的丢失率，同时使低优先级信元的丢失率尽量减小，从而提高了对高优先级信元的服务质量。

Operation Model and Performance Analysis Based on Threshold Priority

With frequent access to network from users,it is important to allocate reasonably the network resources and to reduce the channel burden.This paper analyzes threshold priority's operation and establishes a mathematic model with the theory of queue.And through computer simulation,it gets different threshold's effect to two kinds of cell average residence time and cell losing ratio.The computer simulation results show that threshold priority scheme is able to decrease high-priority cell losing ratio while allowing the low-priority cell losing ratio to be as low as possible if appropriate threshold is chosen.This is able to improve the quality of service for high-priority cell.