移动边缘计算网络下的服务功能链部署优化设计

Optimization design of service function chain deployment under mobile edge computing network

为解决移动边缘计算网络中面向用户的服务功能链部署算法系统成本支出过大、响应时间长的难题,提出了针对服务功能链成本与时延联合优化设计的方法。首先,在服务功能链构建阶段,根据节点位置和资源状况,选择当前最佳节点减少虚拟网络功能(virtualized network function,VNF)间的时延以提高服务功能链的响应时间。其次,在服务功能链部署阶段,由于映射资源有限,在服务映射节点时应用节点选取算法确定最佳节点映射排列顺序,并从中选取最短加权路径作为各VNF间的通信链路。实验仿真结果表明,相比于已有方案,该方法能有效降低时延和部署成本,并能显著提高服务功能链部署的成功率。

In order to solve the problems of excessive system cost and long response time of user-oriented service function chain deployment algorithm in mobile edge computing networks,this paper proposed a joint optimization design method for service function chain cost and delay.First,in the construction stage of the service function chain,accor-ding to the node location and resource status,the algorithm selected the current best node to reduce the delay between VNF to improve the response time of the service function chain.Secondly,in the service function chain deployment stage,due to the limited mapping resources,this paper used the node selection algorithm to determine the optimal node mapping order when serving the mapping nodes and selected the shortest weighted path as the communication link between VNFs.The experimental simulation results show that,compared with the existing solutions,the method can effectively reduce the delay and deployment cost,and can significantly improve the success rate of service function chain deployment.