Research On Network Slice Design And Management In SDN Scenario

With the continuous enrichment of Internet service types,the type of service reliability required for network applications has increased.It's one of the hot topics in the academic community to ensure the reliable contract transmission of network flows with different QoS,under the consideration of the characteristics of each service.Network slicing provides new ideas for QoS guarantee.Network resources are divided into different subnets according to the bearable characteristics.Each subnet has an independent logical topology view.Different services are transmitted using proper slicing to improve QoS performance guarantee.Software Defined Network(SDN)is an effective technical means for implementing network segmentation by decentralizing the control plane and the forwarding plane to centrally program and control the entire network topology and forwarding resources.Studying the network slice design and management mechanism under the SDN scene has important practical significance.The main research contents of this article are as follows.(1)A slice planning and adjustment method that adapts to the network state and user requirements is proposed.On the one hand,in order to make the network resources best match the user's QoS requirements,a slice planning method adaptive to the network state and user requirements is proposed.Through clustering,the different types of user traffic requirements are divided,the slice planning model is solved for each type of traffic,and the connectivity deployment scheme is obtained through the connectivity check.On the other hand,in order to avoid the idle or overload of the slice resources caused by the change of traffic demand and improve the slicing contract ratio,a slice resource adjustment algorithm that senses slice QoS changes is proposed.By deleting the slices with large default rate and low utilization rate,the network resources are released and new slices are created,and the service quality is guaranteed when the traffic characteristics dynamically change.Experimental results show that network slicing can effectively improve the user's contract rate;the slicing resource adjustment strategy inhibits the attenuation of the contract rate and maintains the contract rate at a high level.(2)An intra-slice traffic rerouting method with hotspot direction is proposed.In order to improve the load balancing degree of each link in the slice,this paper focused on the selection of network flow of which route path will be adjusted.Considering the path coupling of different ODs to the traffic,in the overloaded area,the OD flow load distribution in different directions is considered,and the network flow in the high load direction is preferentially rerouted to improve the effectiveness of rerouting.Experimental results show that the algorithm can improve the load balance better when the traffic has directional distribution.(3)A network slice experimental platform for ensuring multi-service QoS in an SDN scenario is designed.In order to respond to the user's real-time demand of QoS traffic,this paper designed each components or functions of this system,such as the network structure of the system,submission and response method of user's QoS request,network performance test method,and slicing management flow.All these modules were designed to build a practical and usable network slicing experimental platform for the research on network slice design and management algorithm research in the previous steps.