在基于SDN架构的混合卫星网络上讨论了服务功能链(Service Function Chain,SFC)的可靠性部署问题,首先对SFC可靠性保护的问题进行描述,建立了底层网络与SFC请求模型,然后建立了网络服务功能的可靠性需求模型与低轨卫星链路的可靠性需求模型,明确了优化目标与约束条件.接着提出基于可靠性的卫星服务功能链保护方法,包括基于深度强化学习的可靠性保护算法和基于低轨卫星节点与链路可靠性备份算法.实验表明,提出的基于可靠性的卫星服务功能链保护方法能在SDN架构的混合卫星网络上提高SFC请求接受率,减少平均时延,在不同的SFC可靠性需求的条件下也保持较高的请求接受率.
A satellite SFCs reliability protection method
This paper discusses the reliability deployment of Service Function Chain(SFC)on the hybrid satellite network based on SDN architecture.Firstly,this paper describes the reliability protection problem of SFC,establishes the underlying network and SFC request model,and then establishes the reliability requirement model of network service function and the reliability requirement model of LEO satellite link,and clarifies the optimization goals and constraints.Then,a reliability-based satellite service function chain protection method is proposed,including a reliability protection algorithm based on deep reinforcement learning and a reliability backup algorithm based on LEO satellite node and link.Experiments show that the proposed reliability-based satellite service function chain protection method can improve the SFC request acceptance rate,reduce the average delay,and maintain high request acceptance on hybrid satellite networks based on SDN architecture.
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维普
