基于NS2的RPR带宽分配算法参数确定方法  

NS2-based Determination of Best parameters in Bandwidth Allocation Algorithm of RPR

作　　者：饶宁[1] 谢高岗[2] 李俊娥[1] 李忠诚[2] 

机构地区：[1]武汉大学计算中心,武汉430072 [2]中国科学院计算技术研究所,北京100080

出　　处：《系统仿真学报》2004年第5期992-997,共6页Journal of System Simulation

基　　金：受国家863项目资助(2002AA121032);中国科学院计算技术研究所青年基金项目资助(20026180-14)

摘　　要：RPR(resiliencepacketring)是一种MAC层的环网络协议,具有全双工,空间可重用,自我护的特点,IEEE正在致力于RPR标准化。带宽分配算法是整个协议(RPRDraft1.0)讨论的重点之一,在分析了RPRDraft1.0中定义的参数Lpcoef和Rampcoef对带宽分配算法效率的影响之后,分别用25种不同的关键参数配置NS2RPR模拟器,模拟经典的两种背景压力情景,综合考虑收敛时间和振荡波形可以选出最优的关键参数组合。实验结果发现Lpcoef=32且Rampcoef=64在收敛时间与振荡方面都优于草案中建议的Lpcoef=64且Rampcoef=64。IEEE is currently standardizing a spatial reuse ring topology network called the RPR (Resilient Packet Ring), which works in MAC layer, with peculiarities of duplex, spatial reuse, and self-protection. Bandwidth allocation algorithm is one of the key algorithms in protocol (RPR Draft1.0). After analyzing the influence of the key parameters of bandwidth allocation algorithm on the algorithm efficiency in RPR draft 1.0 by using 25 pairs of key parameters to configure NS2 RPR simulator, two classical back-pressure scenarios are simulated, and convergence time and oscillations in each case are comprehensively considered. The results of experiment indicate that when Lpcoef equals 32 and Rampcoef equals 64 it is better than that in the case when Lpcoef equals 64 and Rampcoef equals 64 advised in the draft.

关 键 词：RPR 带宽分配算法 参数选择 网络模拟 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]