基于网络编码的机密业务多路径光传输方法

A Network Coding-Based Multipath Optical TransmissionMethod for Secret Traffic

随着互联网应用发展,越来越多具有安全需求的机密业务在空分复用弹性光网络中传输时,面临被攻击或窃听的安全风险.为了确保机密业务的传输安全性和减少频谱资源的浪费,提出一种空分复用弹性光网络中基于网络编码的机密业务多路径光传输方法 .在机密业务的路由阶段,该方法通过设计评估链路被窃听概率、路径跳数和路径上空闲频谱资源的路径代价函数,为机密业务选择最小路径代价的两路径或三路径传输策;在纤芯选择中,设计路径碎片率和负载失衡的评估值,为机密业务选择满足业务带宽需求的碎片率低和负载均衡的纤芯;在频谱分配中,设计满足网络编码条件的频谱碎片和负载感知的频谱分配方法,通过滑动频谱窗方法,为机密业务寻找能网络编码、且导致纤芯的频谱碎片化程度小和负载均衡的频谱块.仿真结果表明,与其他采用网络编码的路由频谱分配算法相比,在负载大于200爱尔兰时,本文所提方法能有效降低机密业务阻塞率和提高频谱资源使用率.

With the development of Internet application,more and more secret traffics with secret requirements face security challenge in terms of being attacked or eavesdropped,when they transmitted in space division multiplexing elastic optical network(SDM-EON).To ensure the transmission security of secret traffic and reduce the waste of spectrum resourc⁃es,a network coding-based multipath optical transmission for security traffic(NC-MOTS)is proposed for SDM-EON.In the routing stage,we design a path cost function which can evaluate the probability of link eavesdropping,the number of path hops and the idle spectrum resources on the path.So,the NC-MOTS selects two paths or three paths transmission strat⁃egy with the minimal route cost.In fiber core selection,we design an evaluation value to evaluate the path’s spectrum frag⁃mentation and load imbalance.Then,we select the fiber core with low spectrum fragmentation and load balancing which meets the bandwidth requirements of secret traffic.In the stage of spectrum allocation,a spectrum fragmentation and loadsensing spectrum allocation method is designed to meet the network coding conditions.Through the sliding spectrum win⁃dow,the spectrum block that can be network encoded and causes the low spectrum fragmentation and makes load balance between fiber cores is found.Compared with other routing spectrum allocation algorithms using network coding,the simula⁃tion results show that the proposed NC-MOTS can effectively reduce the secret traffic’s blocking probability and improve spectrum resource utilization when the network load is greater than 200 Erlang.