Research On Key Technologies Of Network Slicing For NO Stack Framework

In future,there are huge mobile data traffics,massive connectivity devices and plenty of new businesses and application scenarios.And the application scenarios have a wide range of differences in bandwidth,delay,reliability,mobility and other aspects.They are the challenges of 5G network.In order to support multiple application scenarios,the network slicing builds a complete logical network which is a network slice for the corresponding scenario on the same physical infrastructures.Meanwhile,based on the network function virtualization and software defined network technologies,not only stack(NO Stack)framework push down the vertically stacked protocol stack,and provides a mechanism to build a flexible,customized and management centralized network.Because of the flexibility and customization provided by NO stack,it is much easier for the implementation of network slices in the 5G network.At present,the research on the network slicing is mainly concentrated on the core network,but it is also important to implement network slicing on the radio access network(RAN).The issues of RAN network slicing architecture design,wireless resource allocation and network slicing deployment have not been resolved.In the considerations of the above problems,the main research in this thesis includes the following three aspects:Firstly,aiming at the design of RAN network slicing architecture,this thesis proposes a RAN network slicing architecture of U/C/M(User/Control/Management)plane separation.The flatted user plane protocol modules are used to handle the user flows in order to facilitate the modules update and system upgrade,as well as to support the heterogeneous networks convergence.According to business requirements,access network customizes the RAN network slice in the virtualization platform,which could be shared part of the control functions with other RAN network slices.It is conducive to shorten the network slice's creation time and reduce the creation of complex,and improve resource utilization.Secondly,as for the problem of wireless resource allocation,this thesis constructs the system model of RAN network slices,and analyzes three kinds of wireless resource allocation schemes based on the proportional fairness algorithm.It turns out that the fairness of the semi-static resource allocation scheme is superior to the dynamic and static resource allocation schemes.Thirdly,in regard to the problem of network slicing deployment,a mathematical programming model is proposed,which quantifies the deployment requirements of network slices.The simulation and evaluation for the target are carried out by simulating the three typical application scenarios' requirements in delay,capacity and processing capability.The simulation results show that the physical node's utilization rate of the enhanced mobile broadband slice is the highest,and the physical link's remaining bandwidth of the massive machine type communication slice is the largest.