面向可靠性的5G网络切片重构及映射算法

A Reliability-aware 5G Network Slice Reconfiguration and Embedding Algorithm

针对传统网络切片映射方法资源利用率低且可靠性差的问题,该文提出了可靠性感知的网络切片(NS)重构及映射策略(RNSRE)。首先,建立了面向可靠性和资源的网络切片可靠映射效用函数。其次,综合考虑虚拟网络功能(VNF)的资源需求和位置约束,提出了一种VNF可靠性需求的度量方法。在此基础上,以最大化VNF可靠部署收益的同时最小化链路带宽资源开销为目标,建立了切片可靠映射整数线性规划模型。最后,针对不同的网络切片类型,提出了基于邻域搜索的网络切片映射算法和关键VNF备份的网络切片重构映射算法。仿真结果表明,所提算法在满足VNF可靠性需求的同时,提高了资源利用率,降低了映射的开销。

Considering the problems of low resource utilization and poor reliability of traditional network slice embedding,a Reliability-aware Network Slice(NS)Reconfiguration and Embedding(RNSRE)strategy is proposed.Firstly,a utility function of reliable embedding oriented reliability and available resources is established.Then,considering the resource requirements and the location constraints of Virtual Network Function(VNF),a method is proposed to quantify the reliability requirement of VNF.Based on the above works,the reliable network slice embedding problem is formulated as an integer linear programming which maximizes the profits of reliable VNF deployment while minimizing the consumption of link bandwidth resource.Finally,according to different types of network slices,a network slice reliable embedding algorithm based on neighborhood search and a network slice reconfiguration embedding algorithm based on key VNF backup are proposed.Simulation results show that the proposed algorithms improve the resources utilization and reduce the embedding cost while meeting the reliability of VNF.