Based on the Hybrid Optical Switching (HOS) networks, combining the advantages of Optical Circuit Switching (OCS) and Optical Burst Switching (OBS), a new method was proposed to address the problem of designing optimization routing for HOS networks under traffic demand uncertainties. Given the number of wavelength, this paper first reserved several wavelengths for OBS; and then constructed an OCS virtual topology; finally, the reserved wavelengths and optimization method were adopted to achieve OBS routing. In this paper, the network performance optimization metrics is minimizing packet loss probability. The simulation results show that, in the case of the given number of wavelength, this optimal routing method can more effectively reduce packet loss probability of the whole network than the shortest path routing;at the same time, in order to describe the uncertainty of traffic, the authors introduced the uncertainty factor. With the uncertainty factor decreasing, the optimal routing method has less packet loss probability.%在结合了OCS和OBS优点的混合光交换网络背景下,提出了一种业务矩阵不确定的情况下的优化路由方案.在给定的波长数目下,该方案首先给OBS预留若干个波长;然后构建OCS虚拓扑;最后利用预留的波长,采用优化方法得到OBS路由.以最小化丢包率作为优化网络性能指标.仿真结果表明,在给定波长数目的情况下,与最短路由相比,采用优化路由能有效地减少整个网络的丢包率;同时,为了描述业务矩阵的不确定性,引入了不确定因子.随着不确定因子的减小,优化路由下整个网络的丢包率就越小.
展开▼
