Research Of Technologies In Optical Access Network Virtualization And Agile Dedicated Line

With the rapid development of Internet services,users' bandwidth requirements are increasing.As a traffic entrance for all users,the optical access network faces a series of problems such as low resource utilization,weak management and control,rigid network business,and poor user experience.The introduction of virtualization technology and agile dedicated line technology into the optical access network can promote the development of the network to be flexible,intelligent and open.Network operators not only can provide services quickly,but also utilize network resources efficiently and reduce network operation costs.This paper focused on the optical access network resource management and service provision in the multi-tenant scenario.And then we studied the optical access network virtualization and service quality assurance technologies.Based on this,we further explored the bandwidth on demand method for high quality dedicated line services.The main work results are as follows.Firstly,we proposed a priority-based application-oriented access network bandwidth service quality assurance method.The method can reserve access bandwidth according to the historical distribution of applications traffic,and allocate and preempt the shared bandwidth according to the application priority,so as to implement the admission control and service quality guarantee for access bandwidth requests of applications.In the EPON network scenario with a split ratio of 1:64,the simulation results showed that the proposed method could provide differentiated bandwidth resource guarantee services according to the priority of the application.Secondly,we proposed a flexible provisioning and bandwidth on-demand allocation algorithm for dedicated line services based on bandwidth calendar.The algorithm could estimate the current and future bandwidth usage requirements of the dedicated line service according to the bandwidth calendar requests and perform route calculation and pre-allocate the bandwidth resources of the future time slot.At the same time,the algorithm could periodically optimize the bandwidth resources of the current time slot,and realize flexible on-demand provisioning of the dedicated line service and network bandwidth management control of the time dimension.Under the"ring+mesh" network structure consisting of 21 nodes and 33 bidirectional links,the simulation results showed that the acceptance rate of requests can be increased by up to 26%and the network throughput can be increased by up to 42%.Thirdly,we designed and implemented an optical access network infrastructure sharing experimental platform for multiple operators.We validated the functions of multi-operator leased bandwidth logical isolation and bandwidth on demand for network virtualization needs.