摘要
针对弹性光网络中业务分割的资源分配策略消耗更多保护带与设备端口,浪费频谱资源和增加网络能耗的问题,该文提出一种频谱感知的业务分割再合并的资源分配策略。为新业务分配频谱资源时,先计算路径上总链路剩余频谱连续度,选择使剩余频谱连续度最大频谱块传输业务;当路径上频隙数不满足业务传输需求空闲频谱块时,将该业务分割为多个子业务,尽可能选取使剩余频谱连续度最大的多个频谱块承载各子业务。当监视到子业务传输路径上有可用频隙数满足业务传输所需空闲频谱块时,计算剩余频谱连续度作为子业务合并触发的判决条件,将子业务再合并后继续传输。仿真结果表明该文提出的策略能有效降低网络的带宽阻塞率,并节约网络的能耗。
Traffic split provisioning scheme leads to extra guard band and equipment ports occupation, which decreases the spectrum utilization and increases the energy consumption for elastic optical networks. To address the problem, a spectrum-aware traffic split-merge spectrum resource allocation strategy is proposed. When a new request comes, the total link spectrum consecutiveness for each path is calculated. And the spectral block with the highest spectrum consecutiveness is selected to transmit the request. If the number of frequency slots required by the request exceeds the size of any available spectral block in all paths, the demand is split into multiple sub-demands and allocates them into multiple spectral blocks with relatively higher spectrum consecutiveness. When an available spectral block which meets the requested number of frequency slots is detected on the transmission path, the sub-demands are merged. And spectrum consecutiveness is introduced in the decision criterion for the traffic merge operation. Simulation results indicate that the proposed strategy can significantly reduce the bandwidth blocking probability and save the energy consumption for the elastic optical networks.
出处
《电子与信息学报》
EI
CSCD
北大核心
2016年第4期892-898,共7页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61275077)
重庆市教委自然科学基金(KJ1140421)
重庆市科委自然基金(2015jcyj A40024)~~
关键词
弹性光网络
路由频谱分配
业务分割合并
带宽阻塞率
能耗
Elastic optical networks
Routing and spectrum allocation
Traffic split-merge
Bandwidth blocking probability
Energy consumption
