Research on Peer-to-Peer Content Delivery Network and Virtual Pricing for Content Sharing
Date Issued
2004
Date
2004
Author(s)
Li, Feng-Fan
DOI
zh-TW
Abstract
People can easily download various multimedia contents using peer-to-peer content delivery service over the Internet. In spite of the increase in needs for peer-to-peer content sharing, selfish user behavior of free riding, i.e., significantly more content downloads and service usage than content uploads and service provision, have had negative impact on the healthy growth of a Peer to Peer Content Delivery Network (PPCDN). The research of this thesis focuses on resolving the free riding problem for the growth of PPCDNs.
There are two aspects of free riding on a PPCDN. One is free riding on content, and the other is free riding on delivery service. In order to improve or even eliminate the free riding phenomena, a two-stage policy is adopted. At stage 1, users have to provide their contents for sharing when they log in a PPCDN. At stage 2, users trade contents and delivery services over a market with virtual pricing, where super peer checks if users have enough tokens to search or not and price is based on the reputation/ quality statistics of a provider. When users upload/download content to other people, central accounting server get tokens from users/issues tokens to users. To enable the two stages policy, we design a peer to peer network architecture by combining the ideas of super peer and hybrid mode PPCDNs which is named Super Peer Hybrid PPCDN (SPH PPCEN).First feature of SPH PPCDN is that super peer mode is better reliable on search, therefore super peer deal with search request. Second feature of SPH PPCDN is that hybrid mode is better on management, therefore central accounting server deal with management. In the thesis, two-stage policy is adopted in SPH PPCDN, where stage 1 is applied when users log into a super peer and stage 2 is applied when users send search requests to a super peer. To analyze users’response to the two stages strategy, At stage one, we consider user benefit and cost function when user joint SPHPPCDN with provided contents. Based on this utility function , we can analyze how many contents user have to provide and calculate total utility of the whole SPHPPCDN. At stage two, we consider the actual provision and usage of delivery service and establish delivery service utility model being the basis of price determination in virtual pricing.
Finally, we implement a simplified SPH PPCDN environment, which realizes the threshold mechanism of content contribution when users logged in PPCDN by Visual basic.NET. Through Visual basic.NET, We integrate the search and content delivery technology, and implement the content number threshold strategy on super peer. Due to eliminate central accounting server on implementation design, the implementation of stage two policy will be the future work.
Subjects
內容遞送網路
點對點
搭便車
虛擬計價
Virtual Pricing
Free Riding
P2P
CDN
Type
thesis
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