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A protocol named Threshold Bipolar (TB) is proposed as a fetching strategy atthe startup stage of p2p live streaming systems. In this protocol, chunks arefetched consecutively from buffer head at the beginning. After the buffer isfilled into a threshold, chunks at the buffer tail will be fetched first whilekeeping the contiguously filled part in the buffer above the threshold evenwhen the buffer is drained at a playback rate. High download rate, smallstartup latency and natural strategy handover can be reached at the same timeby this protocol. Important parameters in this protocol are identified. Thebuffer progress under this protocol is then expressed as piecewise linesspecified by those parameters. Startup traces of peers measured from PPLive arestudied to show the real performance of TB protocol in a real system. A simpledesign model of TB protocol is proposed to reveal important considerations in apractical design.

Fetching Strategy in the Startup Stage of p2p Live Streaming