Research On Transmission Technologies Of Deterministic Network Based On SDN Framework

With the increasing demand for business conditions and the development and innovation of mobile Internet technologies,low packet loss rates,strict upper bounds on delay and delay jitter boundaries,have all challenged the current network service providers.On the other hand,operators also hope to implement a differentiated fee-based business model depends on different user requirements through a new operational quality management mechanism.For this reason,the concept of deterministic networks was first proposed.The deterministic network emphasizes bounded forwarding delay and extremely low packet loss rate.So this article focuses on deterministic network services on the SDN architecture,especially on the Qo S routing algorithm and multipath transport mechanism in deterministic networks.The main research work of this paper is as follows:(1)First,the background of the deterministic network(Detnet)under the SDN architecture is introduced,and the basic network architecture of the SDN technology is described.Then the related concepts of the NP-hard multi-constraint routing problem are given,and the common multi-constrained routing algorithms such as ant colony and genetic algorithm are briefly introduced.(2)Based on the SDN architecture,it analyzes the three major technologies in the network(resource reservation,path determination,and seamless redundancy),and gives the Detnet system architecture model under the SDN system architecture.Through the collaborative work of the NME module and the PCE module,a real-time information feedback system is realized,which lays the foundation for subsequent multi-constraint routing and multi-path transmission.(3)A multi-constrained routing algorithm is proposed which combines the genetic algorithm and the ant colony algorithm.This algorithm is different from the previous routing algorithm by both preserving the fast convergence of the ant colony algorithm,and expanding the initial solution space by the genetic algorithm.And after the ant colony algorithm enters the early stagnation state,it is rapidly detected and identified,and then the genetic algorithm is used to jump out in time.In this paper,we also analyze and compare the performance of routing and the optimal solution success rate with other routing algorithms.The results prove the superiority of this algorithm.(4)In order to achieve seamless redundancy in deterministic networks,a new multi-path transmission mechanism is proposed.This mechanism introduces the concept of crossover multipath transmission innovatively.It guarantees determinism by using two or more paths to transmit redundant data packets at the same time and copying them at the relay nodes.The network packets can reach the target node on time even if some of the nodes fail.In this paper,we compare the advantages and disadvantages of this mechanism with other common multipath transport mechanism,which reflects the superiority of this mechanism in deterministic networks.