空天地一体化网络基于服务功能链的资源分配

Resource Allocation Based on Service Function Chain in Space-Air-Ground Integrated Networks

空天地一体化网络是6G通信愿景的重要组成部分,该网络借助广域覆盖优势,通过对网络中异构多级资源进行统一管理和综合处理,实现通信服务的全球无缝覆盖。但空天地一体化网络结构复杂且空时大尺度变化,异构网络节点时空跨度大,易引发高时延、动态路由等问题,难以保障不同业务的服务等级。同时,网络拓扑具有高度动态性,因而无法保障适配资源的服务连续性。端到端网络切片和服务功能链技术(Service Function Chain,SFC)作为一种有效方案,能够为不同类型的业务提供定制化服务,具有提升网络性能的潜力。针对上述问题,研究基于网络切片和SFC的天地一体化网络架构;构建多源业务模型,并根据业务种类划分不同的资源切片;提出一种基于可靠性感知的服务功能链映射方法,通过计算部署路径可靠度选择SFC映射路径。仿真结果表明,基于可靠性感知的SFC映射算法相比较传统的SFC映射方案,链路资源利用率高出41.9%,节点资源利用率高出28.4%,服务接受率提高19.7%。

The space-air-ground integrated network is an important part of 6G network.Through the unified management and comprehensive processing of heterogeneous multi-level network resources,global seamless coverage of communication services can be achieved.However,the space-air-ground integrated network is complex and time-varying,and network nodes have large space-time span,which leads to high time delay and other problems.So it is difficult to guarantee the quality of services.End-to-end network slicing and service function chain technology(SFC),as the new solutions,can provide customized services and have the potential to improve network performance.To solve above problems,the integrated satellite terrestrial network architecture based on network slicing and SFC is studied,a multi-source service model is constructed,different resource slices are divided according to service types,and a service function chain mapping method based on reliability aware is proposed.The SFC mapping path is selected by calculating the reliability product,which not only improves the resource utilization of nodes and links,but also improves the service acceptance rate.Simulation results show that,compared with the traditional SFC mapping scheme,the SFC mapping algorithm based on reliability aware has 41.9%higher link resource utilization,28.4%higher node resource utilization and 19.7%higher service acceptance rate.