NDLI: On System Time Analysis for BitTorrent with Sharing Ratio Enforcement

Content Provider	IEEE Xplore Digital Library
Author	Yuh-Jzer Joung Chang, E.
Copyright Year	2013
Description	Author affiliation: Dept. of Inf. Manage., Nat. Taiwan Univ., Taipei, Taiwan (Yuh-Jzer Joung; Chang, E.)
Abstract	BitTorrent's built-in mechanism can effectively encourage peers to upload while they are downloading, but it lacks a mechanism to incentivize peers to continually upload to benefit others after they have completed downloading. As such, many private BitTorrent sites have enforced a {sharing ratio} on their members to demand the minimum amount a peer must upload with respect to the amount it has downloaded. In this paper we study how sharing ratio enforcement affects download time by addressing the following problem: {Given a flash crowd of peers downloading a file, what is the time required for the last peer to finish downloading?} We propose two models to estimate the download time. The first model is simpler in the sense that it does not need to know peers' actual download rates during the downloading process. However, it needs to assume that every peer can fully utilize its uplink capacity. This assumption may not hold when there are much more peers to upload than to download, a scenario that is not uncommon in a system with sharing ratio enforcement. The second model lifts the assumption by extending an existing model for estimating peers' actual download rates in a system with no sharing ratio enforcement. However, estimating peers' actual download rates becomes very complex when the number of peers of different bandwidths increases.
Sponsorship	IEEE Comput. Soc.
Starting Page	674
Ending Page	681
File Size	734031
Page Count	8
File Format	PDF
ISBN	9781467355506
ISSN	1550445X
e-ISBN	9780769549538
DOI	10.1109/AINA.2013.93
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-03-25
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Uplink Erbium Ash Biological system modeling Bandwidth Downlink Load modeling P2P Modeling Peer-to-Peer (P2P) BitTorrent Sharing Ratio Enforcement Download Time
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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