Resource Allocation Mechanism In Virtual Cloud Wireless Access Network Based On TWDM-PON

The virtualized cloud radio access network(C-RAN)based on time and wavelength division multiplexing passive optical network(TWDM-PON)has become a mainstream network access solution.It not only fully combines the advantages of both optical and wireless networks,which provide users with high-capacity,high-reliability,low-loss,low-cost and flexible network access services,but also achieves resource sharing by using network virtualization(NV)technology.However,in the face of the growing demand for mobile wireless networks,the efficient virtualized resource allocation mechanism is essential for TWDM-PON which as a fronthaul support to improve network performance.Therefore,based on the network structure characteristics of TWDM-PON and C-RAN virtualized converged networks,this thesis proposes a virtualized resource allocation mechanism for energy consumption and latency sensing and an energy-aware virtualized resource allocation mechanism with hybrid energy supply for the purpose of making full use of network resources,reducing network energy consumption and improving user service quality.The virtualized base station(VBS)is often established in virtualized converged networks by allocating virtualized network resources and functional entities.However,the existing VBS construction strategies only improve energy efficiency in delay tolerant services,and are not suitable for delay sensitive services.Therefore,a virtualized resource allocation mechanism based on energy consumption and delay is proposed.According to the network and traffic characteristics of the virtualized converged network,considering the resource constraints and proportional fairness,an energy consumption and delay optimization model is established.Furthermore,a heuristic algorithm is used to allocate resources for different types of virtual cloud radio access networks(V-CRAN)and user virtual base stations to complete resource global optimization configuration.The results show that the proposed mechanism can effectively save energy by 62.99% and reduce the latency by 32.32% while improving the network resource utilization.Aiming at the problems of low resource utilization rate,high energy consumption and poor user service quality in the existing virtualized converged network,an energy-aware virtualized resource allocation mechanism with hybrid energy supply is proposed.According to the energy sources and energy consumption of different network devices,energy arrival and energy consumption models are established.Furthermore,under the premise of guaranteeing the quality of user services,considering proportional fairness and energy consumption optimization,distributed algorithms based on asynchronous update are designed to allocate resources and harvested energy for different types of V-CRAN and user VBS to effectively improve the energy efficiency of network.The results show that the proposed mechanism can reduce energy consumption while effectively reducing the latency and improving the throughput.