中文摘要：

网络控制系统的信号以分组的形式在网络中传输,引起了传输时延、丢包等问题;为了更好地研究网络控制系统的性能,利用NS2搭建了网络控制系统的网络传输模型.并以其中的优先级业务分组为研究对象,设计了优先级队列管理算法;在DropTail算法的基础上进行改进,继承了原有算法的优势,并加入了业务优先级识别和弃包选择机制;通过调用两种算法进行实验,从时延、丢包以及吞吐量方面进行分析与对比,验证了PDropTail算法的有效性.

英文摘要：

The signals of network control system are transmitted in internet by the grouping form, which causes the problems such as time delay, packet dropout and so on in the transmission, as a result, in order to study the performance of the network system, this paper uses NS2 to set up network transmission model of network control system, and designs preferential queuing management algorithm by taking its preferential business grouping as research object. This algorithm is improved on the basis of DropTail algorithm, inherits the advantages of original algorithm, and contains business preference authentication and packet dropout selection mechanism. The validity of PDropTail algorithm is tested by using the two algorithms to do experiment for the analysis and comparison from the perspective of time delay, packet dropout and throughput.