基于资源优化的QoS路径选择模糊算法

A RESOURCE OPTIMIZATION-BASED FUZZY ALGORITHM FOR QoS PATH SELECTING

文中讨论了在ＩＰ网络中支持ＱｏＳ路径时优化网络资源的模糊方法，对ＱｏＳ路径选择中出现的多目标路径费用函数进行了合理的描述．该方法综合考虑了路径中的带宽、时延和路径条数，从初选出来的若干条路径中选择更安全，又节约网络资源的路径．仿真结果表明，模糊算法既兼容普通方法，又比普通方法更合理．同时，模糊方法计算简单迅速，用 ＶＬＳＩ（ｖｅｒｙ ｌａｒｇｅ ｓｃａｌｅ ｉｎｔｅｇｒａｔｉｏｎ）硬件很容易实现．

In lP networks, QoS is becoming very important. Before a call is accepted, a suitable QoS path should be decided. In this paper, a new QoS path selecting algorithm for IP networks is presented. With fuzzy logic, a multi-objective cost function for path selecting is given. Bandwidth on the path, delay of the path, and hop count of the path are used as input variables. The membership shapes of the fuzzy variables and the fuzzy QoS path selecting rules are determined experimentally. The trade-off between bandwidth, delay, and hop count of a path brings about more reasonable results. The simulated results show that the path obtained by a fuzzy method is safer for users and more efficient for network resource. Moreover, the fuzzy method is easy and rapid in computing, and can easily be implemented in VLSI(very large scale integration ).