Research On Time-frequency Resource Allocation Algorithm In Wireless Network Virtualization

With the rapid growth of mobile data demands and the increasing maturity of wireless communication technology,the current network lacks an effective method to coordinate wireless communication technology,which leads to the contradiction between emerging technologies and network architecture and the drawbacks of internet have emerged.Wireless network virtualization technology is an effective method to solve the ossification of internet.Through abstracting and managing the physical resources uniformly,and shielding the differences between wireless communication technologies,wireless network virtualization technology can allocate and manage wireless network resources flexibly.In wireless network virtualization,current research for resource allocation mainly focuses on load balance and maximizing the revenue of physical network,while ignoring the importance of lifetime of virtual network request.And the dynamic of virtual network request may cause physical time-frequency resource fragmentation,which can not make full use of physical time-frequency resources.Therefore,a Dynamic Resource Allocation algorithm Based on Lifetime Priority(DRA-LP)is proposed,which configures the virtual network request with short lifetime preferentially.And the physical time-frequency resource fragmentation is considered in the proposed algorithm by using resource reallocation to maximize the utilization of time-frequency resources.Simulation results show that DRA-LP algorithm improves the acceptance rate of virtual network requests and the revenue of physical network due to making use of physical time-frequency resources effectively.In addition,various service types corresponding to the quality of service(QoS)of virtual network request are different,while the QoS of virtual network request is not fully considered in the existing wireless virtual resource allocation algorithm.In order to solve the above problems,a Dynamic Resource Allocation algorithm Based on Quality of Service(DRA-QoS)is proposed.First,the virtual network requests to be allocated are selected according to fairness,and the delay and the lifetime of virtual network request are fully considered to determine the order of allocating time-frequency resources for virtual network request.Then,the algorithm selects virtual network request to reallocate according to the remaining lifetime of allocated virtual network requests and the aggregation degree of idle time-frequency resources.Simulation results show that DRAQoS algorithm can not only make use of the physical resources,but also can improve the QoS of virtual network request.