Research On Integrated Management For Wireless Network Virtualization

With the rapid development of wireless communication technology,diversified services and expanded scale have made the deployment of the network denser and more heterogeneous.This leads to increased capital expenses and operation expenses of service operators.Wireless Network Virtualization(WNV)is a promising solution to this issue,because it can provide ways of flexibly control the physical hardware and fully utilize the network resource,by abstraction,sharing,allocation and re-construction of the resource,and by efficiently managing heterogeneous devices in ways of function decoupling and data control separation.This thesis investigates on~WNV targeting on variety and dynamic types of services to design efficient and effective schemes for on-demand joint control and resource management of UE and the network.The main contributions of this thesis are as follows:1.Proposed a VWNV-based integrated management infr-astructure.When designing the infrastructure,we not only take the traditional components into account including the decoupled air interface,virtual base station and software-defined radio access networks,but also different capabilities of different User Equipment(UE)and Multiple Endpoints Service(MES).Therefore,the proposed infrastructure has benefits for thr-ee key roles:for UE,it can decide the role that each UE takes in MES according to its capability and characteristics;for services development,service provider can focus on the design of the service rather than the distribution of UEs;for network service provider,the joint-optimization of both UE and the network can help a lot on dealing with dynamic and diversified service requirements and bring high r-evenue for them.2.Proposed a control plane reliability guaranteed dynamic resource allocation scheme.This thesis adopted the decoupled air interface technology to let macro base stations to provide UEs with continuous QoS-guaranteed control services wherever they are,in heterogeneous network where the resources of macro/pico cells are orthogonal to each other.Moreover,the allocation of the orthogonal frequency resource is done by a dynamic scheme:maximizing the available frequency resource of pico cells to guarantee the system throughput,under the constraint that the UE control signaling blocking probability should be less than the target probability in the coverage of macro base stations.We applied Markov decision process to derive the mathematical formula of the blocking probability.By applying the formula,we obtain the simulation results under different scenarios,and they demonstrate that the proposed resource allocation scheme can highly elevate the system throughput while guarantee the reliability of UE control plane in the mean time.3.Investigated Virtual Network Embedding(VNE)-based resource allocation scheme that implements the joint-optimization method in the proposed integrated management infr-astructure in the first contribution.This scheme adapts to the trend of more marginalization of network functionality and more diversified types of network services.Under this resource management architecture,all kinds of services are abstracted to Virtual Network Services(VNS).The network will provide services to them by the virtual network embedding of both Service Function Chain(SFC)and UE Traffic Graph(UT-Graph).To deal with the VNE challenges above,this thesis addresses the problem from two perspectives and solve them separately.First,we built the consumption models of various types of resources to fully optimize,and applied Leontief s principle to transform the original multi-objective VNE problem into mixed integer linear programming.Second,we incorporated multiple QoS of services into the system models to construct the VNE-based optimization problems under different scenarios,and maximized the system revenue by allocating resource for different services according to their own revenues while guarantee the QoS.Moreover,we proposed a Partial Staircase Search algorithm to prioritize different services and to effectively improve the computational efficiency of the algorithm.4.Proposed a VNS migration-based dynamic resource balancing scheme.Under the proposed integrated management infrastructure,the mobility of UE and instability of wireless links leads to discontinuous performa nce guarantee of the joint-optimization.To address this problem,we applied VNS migration to dynamically balance the network resource.We proposed an effective evaluation metric of VNS migration,and model the migration process as a non-convex optimization problem,taking into account the asymmetry of resource consumption and traffic flow in wireless networks.To solve the optimization problem,this thesis also proposed two different algorithms,and the simulation results illustrate that the proposed algorithms are much more effective on balancing the resource than the traditional heuristic algorithm of VN migration.