弹性光网络中基于自适应调制的碎片感知共享通路保护算法  

Fragment-aware shared path protection algorithm based on adaptive modulation in elastic optical networks

作　　者：刘鑫 何荣希[1] 陈晓静[1,2] LIU Xin;HE Rongxi;CHEN Xiaojing(College of Information Science and Technology,Dalian Maritime University,Dalian Liaoning 116026,China;Dalian University of Science and Technology,Dalian Liaoning 116052,China)

机构地区：[1]大连海事大学信息科学技术学院,辽宁大连116026 [2]大连科技学院,辽宁大连116052

出　　处：《光通信技术》2020年第2期52-58,共7页Optical Communication Technology

基　　金：国家自然科学基金项目（61371091,61801074）资助;大连海事大学“十三五”重点科研项目（3132016318）资助;中央高校基本科研业务费专项资金（3132017078）资助

摘　　要：为了提高弹性光网络(EON)的频谱利用率,提出一种基于自适应调制的碎片感知共享通路保护算法。该算法利用频谱块承载权重(SBBW)衡量不同频谱块接纳业务的能力,优先选择SBBW大的链路构成候选工作路径,并利用分配前、后SBBW差值最小的频谱块建立工作路径。然后选择可用频谱块和保护频谱块承载能力大的链路构成候选保护路径,建立保护路径时优先使用分配前、后SBBW差值最小的保护频谱块,建立失败时才选择分配前、后SBBW差值最小的可用频谱块。仿真结果表明:该算法可以降低带宽阻塞率、频谱碎片率和备用容量冗余。In order to increase the spectrum utilization in elastic optical networks(EON),an adaptive modulation and fragment-aware shared path protection algorithm is proposed.The proposed algorithm uses the spectrum block bearing weight(SBBW)to measure the ability of connection establishment for different spectrum blocks,and prefers the paths including links with larger SBBW as candidate working paths.The working path is established by choosing the spectrum block with the minimum difference of SBBW before and after the allocation.Then,the proposed algorithm selects the paths containing links with larger weight of both available spectrum block and protection spectrum block as candidate protection paths.The proposed algorithm prefers to use the protection spectrum block with the smallest SBBW difference before and after the allocation to establish the protection path.When the establishment fails,the available spectrum blocks with the minimum difference of SBBW before and after the allocation are selected to establish the protection path.Simulation results show that the proposed algorithm can reduce the bandwidth blocking probability,spectrum fragmentation ratio and spare capacity redundancy.

关 键 词：弹性光网络 共享通路保护 自适应调制 空闲碎片 保护碎片 

分 类 号：TN929.11[电子电信—通信与信息系统]