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Fixed data pre-access method in peer network order system

A technology of an on-demand system and a peer-to-peer network, which is applied in the field of data prefetching in a network on-demand system to achieve the effects of reducing drag delay, improving accuracy, and reducing data prefetching overhead.

Inactive Publication Date: 2008-08-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a data prefetching method in a peer-to-peer network on-demand system, which overcomes the problems of prefetching failure and bandwidth waste caused by inaccurate user behavior predictions, and effectively reduces the user's dragging process. The waiting delay encountered reduces the network bandwidth overhead and processing load of the media server, and improves the speed and efficiency of nodes obtaining prefetched data

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  • Fixed data pre-access method in peer network order system
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  • Fixed data pre-access method in peer network order system

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[0055] This method has been applied in the actual peer-to-peer network on-demand system, and the general situation and parameter settings of the specific system are shown in Table 1 and Table 2. Table 1 gives the server and scale of the whole system. The whole system provides more than 1,500 files, and uses the shared bandwidth of 100Mbps to provide streaming media on-demand services with a code rate of 500~600Kbps for about 400 concurrent clients. Table 2 shows the parameter settings of the fixed-point prefetching method used by the system. The time interval (M) between prefetch points is set to 300 seconds, that is, 5 minutes. The number of consecutive time slots (L) included in each prefetch point is set to 10, that is, 10 seconds. The data window size (H) for sequential prefetch during playback is set to 300 seconds. The number of time slots (L) to be buffered after starting playback or dragging each time is also set to 10, that is, 10 seconds of data.

[0056] ...

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Abstract

The invention discloses a prefetch method for fixed-point data in Peer-to-Peer on demand system, comprising the steps of: (1) the time interval of a pointing device is decided by analyzing user's behavior and experience improvement; a medial head file and a data file are resolved by a file analyzer, metadata information is recorded and a corresponding index file is created; (2) according to media index file information, in condition of acquiring current playing data, prefetching point data is acquired from partner node or source server on 'Minimum Redundancy First' principle with residual bandwidth,; and (3) according to the drag position, integrating the media acquiring data in current channel cache window, a client automatically adjusts the play position to the user-appointed time point, or nearest prefetching point. The invention is based on observation of user's behavior and makes full use of the characteristic of Peer-to-Peer, realizes effective share of fixed-point data, lowers bandwidth consumption of a stream media server, improves user's watch experience, and is suitable for large-scale application.

Description

technical field [0001] The invention belongs to the intersecting field of distributed processing technology and streaming media technology, and in particular relates to a data prefetching method in a peer-to-peer network on-demand system, aiming at reducing waiting delay during user dragging and improving user experience. This strategy is suitable for providing low-latency large-scale streaming media on-demand services within the scope of the wide area network. Background technique [0002] The application of streaming media technology has always been the main way of disseminating multimedia information on the Internet. With the increasing popularity of broadband networks, video-on-demand services, one of the killer applications of the Internet, have attracted widespread attention from academia and business circles. Due to its scalability limitation, the traditional streaming media on-demand system can no longer meet the ever-increasing performance requirements of users. At...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08H04L12/16G06F17/30
Inventor 金海廖小飞蒋文斌程斌张帆余洋黄翀周思炜
Owner HUAZHONG UNIV OF SCI & TECH
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