Research On Hybrid Heterogeneous Multi-Tenant Slicing Management For 5G Transport Networks

5G networks face a variety of business needs and changing application scenarios,such as enhanced mobile broadband services with higher bandwidth and lower latency,high reliability,ultra-low latency vertical industry applications and massive data Internet of Things business.To solve the huge challenge,NGMN released a 5G white paper and proposed an end-to-end network tiling solution.The white paper states that end-to-end network slicing should have at least the following functions:selecting transport network,configuring network functional entities,slicing isolation,and resource management.Previously,ITU-T Study Group 13 focused on slicing management and network softwarization of the network functional entities,but did not implement the slicing of the transport network.At the same time,the formation of 5G transport networks includes the use of multi-vendor equipment and multi-technology systems.To achieve end-to-end slicing management means that when designing a 5G slicing system,it is necessary to consider the differences between devices,and also need to consider the coordinated management of each network segment of the 5G architecture and the management of tenant slicing services in multiple scenarios.How to implement hybrid heterogeneous multi-tenant slicing for 5G transport networks and build an end-to-end slicing system is a challenge.On the other hand,5G Fronthaul2 and the Backhaul network segment carry a large number of services,and any failure will bring huge capital and massive data loss.5G transport network slicing dedicated to improving network quality should provide highly reliable slicing services.The reliability of the slicing refers to the ability of the slicing service to complete the function of carrying the slicing service under specified conditions and within a specified time.The high reliability slice indicates that the slicing network has a lower network blocking rate and a fast function recovery capability.However,there is no deeper reliability slicing study in the field of 5G transport network slicing with flexible control and isolation.At the same time,under the continuous improvement of network speed and lower charging requirements,operators are increasingly strict with the cost of providing network services.So how to provide a high-reliability slicing with good service quality and low cost is a big problem.In order to solve the above problems and realize hybrid heterogeneous multi-tenant slicing management for 5G transport networks,this paper will carry out innovative research from the end-to-end multi-tenant slicing system and high-reliability slicing management.First,in the construction of an end-to-end multi-tenant slicing system,an efficient hierarchical centralized management architecture is designed.The architecture adopts unified database management and cross-layer negotiation mechanism to ensure end-to-end slicing management and flexible access to multiple service scenarios,which helps to expand new services and provide customized services.At the same time,the reliable and inexpensive PON technology is used in the Fronthaull of the transmission network,and the SPTN technology based on Layer 2 switching and Layer 3 switching is used in Frontaul2 and Backhaul respectively.The flexible protocol expansion strategy is used to shield the differences between various technologies and different vendors' devices,and to solve the problem of mixed networking incompatibility.Then,based on the virtual network isolation policy,the on-demand resources are provided for the transport network slicing and the traffic interference between the slicing is reduced.On the other hand,in order to achieve high-reliability slicing with good service quality and low cost,a high-reliability slicing scheme based on partial protection strategy is designed.The "partial protection" in the scheme refers to decomposing the slicing service into multiple small slicing,and then providing partial resources to protect against single link failure of the service.The solution fully utilizes the advantages of flexible management and resource isolation of the transport network slicing,so that the protection resources can perf-orm fault recovery and directed protection more quickly.Based on the partial protection strategy,two key algorithms are proposed:"Equal slicing partial protection algorithm "and" Balanced slicing partial protection algorithm".The first one distributes service requests evenly across multiple paths,and has the advantages of quickly acquiring the shortest multipath set and intelligently implementing cost optimization.On the other hand,the "Balanced slicing partial protection algorithm" can allocate service resources more balanced and provide a lower bandwidth blocking rate by referring to the available capacity ratio of the link and selecting a better set method.Under the consideration of network blocking rate and cost,experiments show that partial protection strategies have great advantages compared with full protection strategies.