A Research On Key Technologies Of The Reconfigurable Network Based On Not Only Stack

Recent years have witnessed the scarcity of spectrum resources,and the system capacity is approaching a circumscription due to the limitation of the evolution of the physical layer transmission technology.All those difficulties will challenge the upgrade of the next generation wireless telecommunication system.Hence,an advanced network architecture necessarily remains to be designed,which should guarantee large-capacity data transmission,lessen network overheads and enhance the scalability.NOS(Not Only Stack)enables the separation of the control plane and the user plane,and it is capable of the abstraction of network resources,contributing to an innovation of the next generation of wireless communication.Based on NOS,this paper investigates a NOS-based reconfigurable network architecture.Contributions are summarized as follows.Firstly,this paper studies the design paradigm of the NOS-RAN(NOS-based reconfigurable radio access network).NOS pushes down the fossilized protocol stacks,resulting in the flat user plane.It also centralizes the control logic of the network.NOS additionally introduces the management plane and global network view.The management plane abstracts the underlying resources and orchestrates them to different functional modules in the user plane and the control plane,according to the global information in the global network view.The mutual cooperation among those components causes intelligent network management and dynamic allocation for network resources.Secondly,this paper discusses the control signaling flows in the NOS-RAN.In the light of signaling procedures and information elements in LTE,X2 handover,initial attachment,detachment and service request are reconstructed in NOS-RAN.On the premise of the signaling procedures' integrity and validity,the centralization of the control logic simplifies the signaling interaction.The simulation results illustrate that the delay budget of handover is 24 ms,and initial attachment takes 160?s in the NOS-RAN.The two procedures respectively achieve the decline of signaling overheads by 28.8% and 42.5%,in comparison to LTE.Finally,this paper proposes a service offloading scheme in the NOS-RAN.A state/action-value network is built by the deep learning method to measure the performance of users' strategies in a distinct environment.A reward function in the reinforcement learning framework is used as the feedback of users' actions to amend the strategies.Users can obtain offloading strategies in various environment,aimed at completing an offloading task with lower energy consumption and overheads.The scenarios in simulation consist of the offloading with different service components,the offloading with various data size,and the offloading with/without handover control.The simulation results demonstrate that the proposed offloading scheme reduces energy consumption and handover rate.This dissertation evaluates the performance of the NOS-RAN on signaling strategies and the offloading scheme.It throws light on the paradigm of future wireless architecture.