Research On Control Technology For IP And Optical Network Convergence

As people's life needs and technological development continue to change,information transmission in today's society has permeated every space of life.Small-granularity services such as real-time chat communication,online games,online streaming media and internet TV,and large-granularity services such as the backup of distribution data in different places,and contents delivery.Not only does the type of services carried by information networks continue to in-crease,but also business traffic is growing rapidly.In the face of this change,network service providers are looking for a solution that can improve the capa-bilities of network service delivery.Large service providers typically support two types of network infrastructure——an IP network at layer 3 and an optical transport network at layer 1/0.At present,different layers of networks are planned and designed by different groups of people and are operated separately.This is due to the different role of the network itself in terms of functions——layer 3 network is suitable for small-granularity large-scale distributed interactions.The optical transmission net-work focuses on high-reliability data transmission with large granularity and long distance.On the other hand,the technology of the two layer networks is also very different-IP networks use packet switching,while optical transport networks use circuit switching.However,using two different mechanisms to operate two networks in this way is obviously more expensive and inefficient than operating a unified network with a unified control architecture.This paper focuses on the integrated control of IP networks and optical networks,tries to implment the automatic and intelligent service provisioning considering different networks scenarios,from the three aspects:architecture design,implementation and control strategy in depth.Experiments and per-formance verifications were conducted on the software-defined heterogeneous network experimental platform and simulation platform.This paper specifi-cally includes the following points:(1)For the integrated control problem of IP-based networks and optical networks,a General Modular Hybrid Architecture(GMHA)is proposed,tak-ing into consideration the networking mode of multiple networks.A general controller model supporting this architecture was designed,as well as the con-trol mechanism and typical workflow under this architecture.Through the work of the open source project and the extended design,a general controller model is implemented.Furthermore,aiming at the smooth accessing of the optical transport network with a Generalized Multiprotocol Label Switching(GMPLS)control plane,a GMPLS network adaptor is proposed which can support the ab-stract mode and the global mode.By setting up a software-defined multi-layer heterogeneous network experimental and simulation platform,the feasibility and effectiveness of the General Modular Hybrid Architecture and the general controller model are verified.(2)In the context of service provisioning networks,the concept of virtu-alized transmission links(VTL)based on GroupTable control in OpenFlow is innovatively proposed for the dynamic optimization of differentiated service provisioning and resource allocation.Based on the VTL,a dynamic bandwidth adjustment method(VTL-DBA)is further proposed.The VTL can support the aggregation of heterogeneous optical transmission channels and provide the OpenFlow-enabled boundary IP layer devices as virtual links.Using VTL can greatly simplify the operation complexity brought by dynamic bandwidth ad-justment and simplify the operation and maintenance.The VTL-DBA improves the efficiency of the usage of network bandwidth resources by supporting dif-ferentiated service provisioning,sharing idle resources,and dynamically re-stricting the bandwidth used by low-level services.It also reduces the service blocking rate and reduces the occupation of transmission resources.(3)In the service provisioning network scenario,around the service provi-sion delay problem,it is important to study the impact of dynamic demolition of the optical layer transmission channel on service delivery performance.A Re-source Delay Release(RDR)strategy is proposed,that is delaying the release of the optical channel when the transmission channel is not carrying any service.It can be used to improve the performance of the service provisioning time.By analyzing the different service durations and different service type ratios,the impact of the set delay time on the strategy is affected.According to setting the influencing factor as a parameter,the value of the delay time to be set under different network conditions is calculated by the formula.The RDR strategy can low the service provision delay and reduce the network blocking rate.