广义随机Petri网对交换机过载控制机理研究

Study on overload control schemes in digital exchanges using generalized stochastic Petri networks

在分析阻塞呼叫控制机理的基础上 ,用广义随机 Petri网 (GSPN)对数字交换机中另一种常用过载控制机理——延时呼叫控制 ,进行了描述与分析 ,建立了其 GSPN模型。通过对模型求解 ,得出了采用控制后系统性能的解析表达式 ,以及与控制严密程度之间的关系 ,从而定量分析并评价了这种控制机理的控制特性。最后 ,对两种控制机理的结果进行了比较。

Based on blocking call control scheme, another overload control scheme called delaying call control is described and analyzed using generalized stochastic Petri networks (GSPN) with its model construction. By solving the model, the analytic formula of the system performance under this control, the relationship between performances indexes and control strictness are obtained. The overload control property can be analyzed and evaluated in a qualitative way. Finally the results of the two control schemes are compared with each other.