基于频谱切片的弹性光网络中可调度请求资源分配算法

针对确定业务开始时间和结束时间特性的可调度请求加重了弹性光网络的资源碎片率和带宽阻塞率的问题，设计了一种配置频谱切片机的弹性光网络节点结构，并提出一种基于频谱切片的可调度请求路由频谱和时间分配(SS-RSTA)算法。在路由选择阶段，设计了一种综合考虑路径长度、路径碎片率和节点可用频谱切片机数量的路径权重值的路由选择策略，为可调度请求选择路径权重值最大的路由;在资源分配阶段，采用链路的资源碎片感知方法为可调度请求选择可用的频谱和时间资源窗口;当资源分配失败时，采用频谱切片准则将可调度请求切分为多个子带宽请求，以增加可调度请求频谱分配成功的概率，提高频谱-时间碎片的利用率。仿真结果表明，所提算法可改善网络的带宽阻塞率和提高网络的频谱利用率。

Resource allocation algorithm for scheduled lightpath demands in elastic optical networks based on spectrum slicing

Aiming at the problem that schedulable requests that determine the characteristics of service start time and end time increase the resource fragmentation rate and bandwidth blocking rate of resilient optical networks, a node architecture for resilient optical networks with spectrum slicers is designed, and a routing spectrum and time allocation algorithm based on spectrum-slicing is designed (SS-RSTA). In the routing selection phase of SS-RSTA, a path weight value-based routing strategy is proposed, which integrates path length, path fragmentation probability, and the number of available spectrum slicers at nodes. The route with the most path weight value is selected for the demand. In the resource allocation phase of SS-RSTA, the available spectrum, and time resources windows are selected for the scheduled lightpath demands by using link resource fragmentation-aware approach. When the resource allocation fails, the spectrum-slicing criterion is used to slice the scheduled lightpath demand into multiple sub-bandwidth requests to increase the probability of successful spectrum allocation for scheduled lightpath demands and improve the utilization of spectrum time fragmentation. Simulation results show that the proposed algorithm can reduce the bandwidth blocking probability of networks and enhance the resource utilization of networks.