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Improved video on demand (VOD) transmission method based on peer-to-peer computing core algorithm

A video-on-demand, computing core technology, applied in transmission systems, image communication, selective content distribution, etc., can solve the problems of huge network resource consumption, no economic scale, long duration, etc., and achieve an efficient video-on-demand transmission system. Effect

Inactive Publication Date: 2012-12-12
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the C / S mode, due to the large bandwidth and long duration of streaming media transmission, and the limited network bandwidth available on the server side, even if a high-end server is used, its system capacity is only a few hundred clients, which is not economical. Scale
In addition, due to the uncertainty of the Internet, if the client is far away from the server, the delay, jitter, bandwidth, packet loss rate and other indicators during streaming media transmission will also be more uncertain
The server sends streaming media content for each client individually, so the consumption of network resources is also very huge

Method used

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  • Improved video on demand (VOD) transmission method based on peer-to-peer computing core algorithm
  • Improved video on demand (VOD) transmission method based on peer-to-peer computing core algorithm
  • Improved video on demand (VOD) transmission method based on peer-to-peer computing core algorithm

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Embodiment Construction

[0049] The method of the present invention emphasizes the improvement of the core algorithm in BitTorrent, and introduces an adaptive sliding window mechanism to meet the real-time requirements of video on demand.

[0050] . Improved segment selection algorithm

[0051] In the BitTorrent system, the Local Rarest First (Local Rarest First) strategy is adopted, that is, the node only needs to know the distribution of the file slices of the shared file in its neighbor nodes (usually 50 nodes), in it and all its neighbors Implement the least file block first strategy in the node. This can reduce the system load and maintain a uniform distribution of file blocks locally. But BitTorrent has some problems in segment selection strategy: because local minimum priority is only based on local information, local minimum does not mean global minimum, so the selection of file blocks is blind to a certain extent.

[0052] The improved segment selection algorithm is: by improving the seed upload...

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Abstract

Disclosed is an improved VOD transmission method based on a peer-to-peer computing core algorithm. An adopted topological structure comprises a torrent file producing server, an electronic program guide (EPG), an improved tracker, a streaming media server and an improved BitTorrent client. According to the method, a piece selection algorithm and a node selection algorithm in the BitTorrent protocol are improved, a self-adaptive sliding window mechanism is introduced, efficient file distribution capacity of the BitTorrent protocol is fully used, and requirements of the VOD for timeliness can be satisfied simultaneously, not only the problems of single point of failure of the server and bottleneck of server connection are solved, but also the load pressure of the server can be reduced.

Description

technical field [0001] The present invention is an improved video-on-demand system transmission method based on the peer-to-peer computing core algorithm. The peer-to-peer computing protocol used is the BitTorrent protocol. It improves the segment selection algorithm and node selection algorithm in BitTorrent, and introduces an adaptive sliding window mechanism. Restricting slice selection requests to meet the real-time requirements of video on demand belongs to the field of peer-to-peer network applications. Background technique [0002] Video on demand technology is an important application technology of distributed streaming media. Video on demand is also known as VOD, the full name is Video on Demand, that is, video streaming on demand. Video-on-demand technology is a cutting-edge technology in the current streaming media communication application, and it is a new technology that combines future-oriented information, communication and other related technologies. At the...

Claims

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Application Information

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IPC IPC(8): H04N21/258H04N21/262H04N21/437H04N21/438H04L29/08
Inventor 王汝传裴双迎李致远孙力娟韩志杰邵星林巧民肖甫黄海平
Owner NANJING UNIV OF POSTS & TELECOMM
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