基于负载均衡的卫星光网络路由与波长分配方法研究  

Routing and Wavelength Assignment Based on Load Balance for Optical Satellite Network

作　　者：王蔚龙 李勇军[1] 赵尚弘[1] 辛宁[2] 赵海燕[1] Wang Weilong;Li Yongjun;Zhao Shanghong;Xin Ning;Zhao Haiyan(Communication System Department,Information and Navigation College,Air Force Engineering University,Xi'an,Shaanxi 710038,China;Institute of Telecommunication Satellite,China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]空军工程大学信息与导航学院通信系统教研室,陕西西安710038 [2]中国空间技术研究院通信卫星事业部,北京100094

出　　处：《激光与光电子学进展》2021年第7期149-159,共11页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(91638101);国家自然科学基金青年科学基金(61701522)。

摘　　要：提出基于用户业务分布的卫星光网络负载均衡路由与波长分配(LBRWA)算法,利用蚁群算法寻找最优光路径,实现了卫星光网络负载平衡。建立基于全球用户业务分布的卫星光网络LBRWA优化模型,根据链路持续时间和波长空闲率搜寻下一跳链路,同时引入随机扰动,避免局部最优。利用全球用户流量强度分布模型修正统计平均光路径成本,实现链路状态更新,将流量引向非热点区域卫星节点,为用户请求寻找负载均衡的最优光路径。研究结果表明,与传统基于链路状态的弹性负载均衡(ELB)算法相比,LBRWA算法将拥塞率降低了20.49%,且在资源利用率、业务分布指数和最大归一化星间链路负载方面具有更好的性能,有效地实现了卫星光网络负载均衡。A load balancing-routing wavelength assignment(LBRWA)algorithm based on user traffic distribution for satellite optical networks(OSNs)is proposed.The ant colony algorithm is employed to find the optical path so that the OSNs can achieve effective load balancing.The LBRWA optimization model in the OSNs based on global user traffic distribution is established.It searches for the next-hop link according to the link duration and wavelength idle rate and introduces random disturbance to avoid local optimum.The statistical average optical path cost corrected by the user traffic intensity is employed to update the link status;the traffic is directed to the satellite nodes in the non-hot spot area to find the load balancing optimal optical path for user requests.Numerical simulation results show that compared with traditional elastic load balancing(ELB)algorithm based on link-state,LBRWA algorithm reduces the congestion rate by 20.49%.In addition,LBRWA has better performance in terms of resource utilization,traffic distribution index,and max normalized inter-satellite link load,thereby effectively realizing load balancing in OSNs.

关 键 词：光通信 卫星光网络 路由与波长分配 波分复用 负载均衡 LEO卫星星座 蚁群算法 

分 类 号：TN929.1[电子电信—通信与信息系统]