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P2P-based content distribution system streaming services and Implementation

Author: WangYingHui
Tutor: HanHong
School: University of Electronic Science and Technology
Course: Computer System Architecture
Keywords: P2P Content distribution Overlay network Load balancing
CLC: TP393.02
Type: Master's thesis
Year: 2009
Downloads: 138
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Abstract


The rapid development of the current network infrastructure and related hardware technology, given the considerable development of streaming media technology space. However, due to the existing Internet network infrastructure bandwidth still can not match the number of users and the size of the data of the increasingly large streaming, traditional C / S mode of service has been unable to reach a satisfactory quality of service P2P streaming media technology, in this case, to be shipped born. This technology is the services dispersed to each node in the network, using the client's network resources to service. However, due to the pure P2P network node leave or join the frequent and complex topology and routing mechanism, how efficient use of client resources to build efficient, stable and high player experience streaming service system has become difficult. At the same time, the content distribution network (Content Delivery Network) technology closer to the high heat of the media content caching to the edge of the network on customer service node achieve dispersion of Service. Edge service node in the traditional CDN networks, however, are still using C / S with clients interact, become the bottleneck of the system so that the edge of the service capacity of the service node. Therefore, by combining P2P technology and content distribution technology, the formation of edge service node client P2P interactive mode, it can give full play to the advantages of the two techniques. This paper presents a hybrid streaming media service system based on in-depth study of the above two techniques, the P2P-CDN. Mixed model of P2P content distribution constitutes a highly scalable, high playback experience streaming media distribution system. P2P-CDN system uses a two-tier structure, the upper cover the distribution network to build high-performance backbone mesh P2P structure to provide high-performance, large-scale streaming live and on-demand services, client nodes connected to the backbone network. For live service, live backbone distribution network topology optimization, a great degree of reduced playback delay to protect the system QoS. For on-demand services, the hybrid system uses a combination of push and pull distribution methods to improve the quality of service. Push initiated by the server to the high heat proactive caching media files to the service node, pull way initiated by the client to pull the media files into the edge of the node. System through intelligent released load control modules on the core network service nodes, and achieve better load balancing and efficient use of network resources. In this paper, the current pure P2P live streaming in loss of synchronization delay larger problem, a new genetic algorithm based on simulated annealing, to build a minimum with the right to have a limited spanning tree. By the reference simulated annealing mechanism of the fitness of the chromosome of a stretch. Proposed efficient algorithm crossover and mutation, and avoid the patch and the introduction of the punishment mechanism, in order to reduce the transmission delay on the backbone network. The simulation results show that the algorithm has better convergence and generated network topology is also improved compared with traditional greedy algorithm. Intelligent load balancing control module released, we propose a simple and effective dynamic prediction algorithm, namely dynamic acquisition overlay network node load, mixed consider the factors of the distribution file size, and the final decision-making cache node, to achieve on-demand services covering the load balancing of the network node. The simulation results show that it can achieve good load control.

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