A novel optimistic unchoking algorithm for bittorrent

Authors:
Zuhui Ma;Dongyu Qiu
Affiliations:
Electrical and Computer Engineering, Concordia University, Montreal, Quebec, Canada;Electrical and Computer Engineering, Concordia University, Montreal, Quebec, Canada
Venue:
CCNC'09 Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference
Year:
2009

Citing 2
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Abstract

Optimistic unchoking plays an important role in BitTorrent Peer-to-Peer (P2P) file sharing networks. Peers use optimistic unchoking to find upload bandwidth information about their neighbors. However, free-riders can also take advantage of optimistic unchoking and download from the network without uploading anything. In this paper, we propose a novel optimistic unchoking algorithm for BitTorrent. The main purposes of our algorithm are to prevent free-riding and to improve the efficiency of optimistic unchoking. We then propose a stochastic model to analyze the performance of our algorithm. We also verify the results by simulations. Both theoretical and simulation results show that our algorithm can effectively prevent free-riding and significantly improve the download rate of normal peers at the same time.