Research On Key Technology Of Video Transmission In Next Generation Network

The next generation network multimedia data communications business will be integrated into the unified IP network, to provide users with various services.In this paper, based on investigate of the IP network, integration of fixed and mobile video communication technology infrastructure, a research from network layer, transport layer and application layer of different angles on the key technology of the next generation of video transmission network is processed. Following is the innovative research work of thesis:(1) In the network layer, a method based on the ant colony optimization heuristics smart QoS multicast routing algorithms is proposed. From the standpoint of artificial intelligence, a method of IP multicast routing Wayfinding is put forward. A method based on the ant colony to meet multiple QoS of bound, such as bandwidth, delay, delay jitter, packet loss rate, cost, is proposed by the dynamic multicast routing algorithm (DM-ACA). Algorithm uses the reverse path mechanism. Ants start from the purpose nodes to find the source of nodes. And the dynamic change problem of multicast network is solved. Through the introduction of the information-inspired mechanism that flooding mechanism, initial group sieving mechanism, and additive increase multiplicative decrease (AIMD), to solve the weak local searching ability of ant colony algorithm, convergence slow and easy leading to local optimal result of the problem. The simulation results show that the algorithm is feasible and effective.(2) In the transport layer, based on complex networks, scale-free networks and small world network theory, the modeling problems of network have been studied, a network simulation model for the underlying network topology is proposed. Research shows that, degrees of nodes in the Internet follow the power-law distribution, and have characteristics of scale-free. The network simulation model established based on the scale-free networks can reflect more realistically of the application in the evolution of Internet. Based on the research of scale-free network, a non-steady growth model of logarithm relations is put forward, and the simulation of the application layer Gossip Multicast (ALM) is established. The simulation results show that, comparing with the uniform random network model, the scale-free networks based on this paper match with the actual Internet model. Comparing with Planetlab test bed and the reality test and measurement data, the simulation based on the scale-free network can simulate large-scale network applications effectively. (3) In the application layer, based on the study of P2P application layer multicast data distribution model, a mechanism of node management control based on Gossip is proposed. The effective data access and distribution method is used in distributed applications. An effective member management protocol called as Gomcast (Gossip-based Overlay Multicast) is made. Research shows that most of the traditional Gossip solutions work very well in small-scale node configuration, but in the case of large scale, transmission reliability and performance are reduced. This is because of lack of overall node information for single, over load flow and lack of flexibility and other reasons. This paper proposes the following strategy to provide a reliable local node view: obey the power law distribution and use of priority connections growth model; push-pull mechanism gossip; the optimization of the heart based on distributed hash table. Experimental results show that a better transport management performance in the case of more large-scale joint strategy.(4) The multimedia members management model of P2P SIP was discussed, a new type of multimedia transmission control mechanisms. A Chord algorithm is designed using the P2P model, using the SIP as a control signal transmission model. Then the start-up of nodes and registration issues are discussed in detail, the steps of the process are designed.(5) Convergence technology of fixed and mobile network in IMS is studied. Network integration in the IMS and PSTN signaling exchange mechanism is discussed. A sharing of IMS and PSTN reference model is proposed, the typical call conversation process from SIP to ISUP is discussed, the realization of SIP signaling and ISUP exchange information on mapping the structure and mechanism is given. On this basis, the paper designs and implements a specific MGCF, focus on the application layer modular design, and gives a specific message mapping implementation of the state machine.(6) In a heterogeneous network, an adaptive video streaming transmission mechanism is discussed. Using Click Modular Router module, a heterogeneous environment of wireless network and IP network is designed. When network parameters change, clients adaptive adjust video streaming quality of service. Experimental results show that, when the network parameters change, VideoLAN termination received video services, video streaming service quality can be assured, and the schedule is feasible and effective.