Research On Organization Method Of Multipath Relay Transmission Service Network Based On SDN

IMS multimedia standard system introduced by 3 GPP in the R5 version becomes the core technology of the next generation network.Based on traditional default route a single path transmission mode,IMS has end-to-end QoS guarantee difficult,low transmission efficiency and bandwidth bottleneck effect prominent,seriously restricted the IMS application development and innovation.Based on application-layer relay to construct multipath multimedia transmission of real-time service overlay network can realize the transmission of QoS guarantee by adding redundancy,in order to overcome the problem of inefficient,achieve IMS performance greatly improved.In the process of constructing the multipath relay transmission service network,the problems such as the organization mode,the route selection and the control of the network and the evaluation of QoE system are considered in the process of multipath relay transmission service network.On the basis of the service overlay network organization model and related algorithms,in the course of the study,the main progress in the following three aspects:firstly,in order to solve the problem of the relay node path selection,this thesis for service overlay network data transmission mode,put forward the node and path description method the two description method;secondly,SDN based technology thought,the controller and the transponder are separated,on the basis of traditional P2P model proposed a MR-Cluster model.The relay node points into super,cluster management and ordinary nodes three categories,and discusses the nodes join and leave and related algorithms of network topology;again,The OpenPath protocol is designed for the message interaction between the controller and the cluster management node,the cluster management node and the relay node,which can manage the service overlay network and relay path generation effectively.Finally,in the comprehensive analysis of each path category and QoS constraints based on proposed a meet QoS multipath transmission path selection algorithm.The algorithm demands the path of the path to meet the two requirements of bandwidth and delay,and selects the disjoint path to improvyaoe the redundancy of the path,thus improving the efficiency of the network operation.Finally,the thesis uses the network simulator OMNetT+ + for the MR-Cluster network model and the multipath transmission relay path selection algorithm for simulation testing,verification of the service network models and routing algorithms in related fields of application feasibility and effectiveness.