A Globaltrust-Based Differentiated Service Scheme in BitTorrent

Man Jingui; Wang Miao; Zhang Hanwen; Zhang Yujun

Journal of Computer Research and Development > 2012 > 49(6): 1204-1210.

Man Jingui, Wang Miao, Zhang Hanwen, Zhang Yujun. A Globaltrust-Based Differentiated Service Scheme in BitTorrent[J]. Journal of Computer Research and Development, 2012, 49(6): 1204-1210.

Citation:

Man Jingui, Wang Miao, Zhang Hanwen, Zhang Yujun. A Globaltrust-Based Differentiated Service Scheme in BitTorrent[J]. Journal of Computer Research and Development, 2012, 49(6): 1204-1210.

Citation:

Man Jingui, Wang Miao, Zhang Hanwen, Zhang Yujun. A Globaltrust-Based Differentiated Service Scheme in BitTorrent[J]. Journal of Computer Research and Development, 2012, 49(6): 1204-1210.

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A Globaltrust-Based Differentiated Service Scheme in BitTorrent

1(Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190) 2(Graduate School of Chinese Academy of Sciences, Beijing 100049) 3(DNSLAB, China Internet Network Information Center, Beijing 100190)

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Published Date: June 14, 2012

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Abstract

Abstract

BitTorrent system suffers from free-riding because free-riding behavior has negative effect on the performance of the system. However, existing mechanisms used to counter free-riding in BitTorrent are not effective enough. In this paper, we propose a global-trust-based differentiated service scheme to deal with free-riding problem. In our scheme, tracker serves as a computation agent to calculate peers' global trust values. With these values, tracker identifies free-riders and contributive peers, and then disseminates the information of free-riders to free-riders and the information of contributive peers to contributive peers. Through such isolation, free-riders will have no chance to connect with contributive peers to obtain resources. Moreover, contributive peers are divided into high-contributors and normal-contributors. Tracker provides differentiated service for these peers according to their return ratios, which makes high-contributors achieve faster download bandwidth. Simulations show that the proposed scheme can significantly isolate and penalize free-riders, thus incentivizing peers to donate more upload bandwidth for the system.
- BitTorrent,
- free-rider,
- global trust,
- differentiated service,
- return ratio

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