Research Of The P2P Content Distribution Mechanism Based On Network Coding

As a prevailing communication technology for the Internet in recent years, P2P possesses many advantages, such as decentralization, load balance, expandability, which help to break through the constraints that the traditional C/S structure had. Furthermore, PSP has achieved great progress in distributed computing and instant communications. Content distribution as an important criterion for the development of network performance, how to improve the P2P content distribution mechanism so as to solve practical problems such as bandwidth utilization and network throughput is the primary purpose in the relevant field.In the P2P content distribution mechanism, how to use the network coding technology is the key research field. In this way, the problems that exist in the P2P content distribution software such as BT can be solved. Firstly, cut the large files into small pieces by segmentation method and encode the small file pieces. The encoding packets with small capacity can improve the network throughput in the limited bandwidth and reduce the transmission delay. Secondly, the file pieces as the smallest unit in the transmission can be distributed to the network quickly. In this way, the problem that the download success rate entirely depends on the online time and stability of seeds nodes can be solved. Lastly, the encoded packets divided in the coding area can be transmitted among the other nodes through new channels, so the nodes can acquire the information blocks that have not downloaded from the other nodes but not from the encoding area. The waste of time and download bandwidth due to repetitive downloading of the same resources can be solved.So, network coding technology as a new technology, once put forward, has attracted attention and provoked research in the field. After the research on network coding technology in theory and practice, this paper adopts the random linear network coding algorithm, which is combined with P2P content distribution technology. The experiment data obtained from the OverSim simulation platform show that the performance in the P2P content distribution mechanism combined with the network encoding technology can be enhanced. The robustness of the system, the resource download rate and success rate can be greatly improved, too.