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Comparison of Robust Cooperation Strategies for P2P Content Distribution Networks with Multiple Source Download
- IN PROCEEDINGS OF THE SIXTH IEEE INTERNATIONAL CONFERENCE ON PEER-TO-PEER COMPUTING (P2P2006
, 2006
"... The performance of Peer-to-Peer (P2P) content distribution networks depends highly on the coordination of the peers. Sophisticated cooperation strategies, such as the multiple source download, are the foundation for efficient file exchange. The detailed performance of the strategies are determined ..."
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Cited by 5 (3 self)
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The performance of Peer-to-Peer (P2P) content distribution networks depends highly on the coordination of the peers. Sophisticated cooperation strategies, such as the multiple source download, are the foundation for efficient file exchange. The detailed performance of the strategies are determined by the actual peer characteristics and the peer behavior, such as the number of parallel upload connections, the selfishness, or the altruistic re-distribution of data. The purpose of this work is to evaluate and investigate different cooperation strategies for multiple source download and select the best one for a scenario for even leeching peers, i.e. peers which depart as soon as they have finished their download. The question arises whether the cooperation strategy can smoothen the overall performance degradation caused by a selfish peer behavior. As performance indicator the evolution of the numbers of copies of a chunk and the experienced download times of files is applied. The considered scenarios comprise best-case (altruistic peers) and worst-case scenarios (selfish peers). We further propose a new cooperation strategy to improve the file transfer even when mainly selfish peers are present, the CygPriM (cyclic priority masking) strategy. The strategy allows an efficient P2P based content distribution using ordered chunk delivery with only local information available at a peer.
Comparison of crawling strategies for an optimized mobile p2p architecture
- IN 19TH INTERNATIONAL TELETRAFFIC CONGRESS (ITC19
, 2005
"... Mobile networks differ from their wireline counterparts mainly by the high costs for air transmissions and by the mobility of the users. A new entity, denoted as the crawling peer, is suggested in order to optimize the resource mediation mechanism for a mobile P2P file sharing application. The crawl ..."
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Mobile networks differ from their wireline counterparts mainly by the high costs for air transmissions and by the mobility of the users. A new entity, denoted as the crawling peer, is suggested in order to optimize the resource mediation mechanism for a mobile P2P file sharing application. The crawling peer locates content on behalf of mobile peers. It is placed in the wireline part of the mobile network and thus, does not suffer from the above mentioned restrictions. The crawling peer is part of a comprehensive mobile P2P file sharing architecture [1] which is based on the popular eDonkey file sharing application. The performance of three querying strategies of the crawling peer is investigated with respect to banning at the index servers and the response time of requests, i.e. the time to find a file. The results show that the selection of an appropriate request strategy for the crawling peer maximizes the probability of locating a file while the probability to be banned by an eDonkey index server is minimized.
Mobile P2P: Turning Heterogeneity to an Advantage
"... Peer-to-peer content-distribution networks have a large user community in the fixed Internet today and cause a noticeable part of Internet traffic. Enabling popular peer-to-peer applications on mobile devices in cellular networks is an interesting opportunity for both, customers and operators. Howev ..."
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Peer-to-peer content-distribution networks have a large user community in the fixed Internet today and cause a noticeable part of Internet traffic. Enabling popular peer-to-peer applications on mobile devices in cellular networks is an interesting opportunity for both, customers and operators. However, when mobile devices join peer-to-peer networks, the networks become heterogeneous (e.g. differing link capacities, CPU power, etc.), leading to disadvantages for all peers in the network. Consequently, mobile devices need some kind of support to be integrated properly in content distribution networks. In this paper, the heterogeneity in peer-to-peer networks is not only considered as disadvantage but also as new opportunity. Mobile devices are identified as providers of advanced mobile features and services, being usually not available in the fixed Internet. Instead of considering mobile devices as bottlenecks, they are regarded as valuable partners in content distribution networks. Mobile features and services are made accessible to fixed peers, facilitating the integration of mobile devices into popular peer-to-peer networks.
Integration of Mobile Devices into Popular Peer-to-Peer Networks
"... Abstract—Peer-to-peer content-distribution networks are nowadays highly popular among users that have stationary computers with high-bandwidth Internet connections. Mobile devices (e.g. cell phones) that are connected to the Internet via cellular-radio networks, however, could not yet be launched in ..."
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Abstract—Peer-to-peer content-distribution networks are nowadays highly popular among users that have stationary computers with high-bandwidth Internet connections. Mobile devices (e.g. cell phones) that are connected to the Internet via cellular-radio networks, however, could not yet be launched into this field to a satisfactory extent. Although most mobile devices have the necessary hardware resources for joining peer-to-peer content-distribution networks, they are often not able to benefit from participation, due to limitations caused by mobility. In this work, mobile devices are identified as providers of advanced mobile features and services that are usually not available to computers in stationary networks. These mobile features and services can be exchanged for services in peer-to-peer networks, turning mobile devices into valuable trading partners. Partnership schemes are set up to define the way of a fair cooperation between mobile devices and other peers. A novel peer-to-peer architecture is suggested that applies partnership schemes to a well-established peer-to-peer content-distribution network and facilitates the integration of mobile devices. I.
Impact of Vertical Handovers on Cooperative Content Distribution Systems
, 2007
"... uni-wuerzburg.de We evaluate the performance of a P2P-based content distribution system in heterogeneous, wireless networks. The mobile users coordinate each other with cooperation strategies enabled by the multi-source download mechanism, as in eDonkey or BitTorrent. Due to the mobility, vertical h ..."
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uni-wuerzburg.de We evaluate the performance of a P2P-based content distribution system in heterogeneous, wireless networks. The mobile users coordinate each other with cooperation strategies enabled by the multi-source download mechanism, as in eDonkey or BitTorrent. Due to the mobility, vertical handovers between different wireless access technologies are required which may result in transmission delays and IP address changes of the switching peer. Hence, connections among users have to be reestablished and downloading users are requeued at a providing peer’s waiting queue. In detail, we investigate the impact of requeueing with each VHO as well as the use of mechanisms that preserve the IP address and connections beyond VHOs, like MobileIP. Another important phenomenon occurring with VHOs is the abrupt change of the available bandwidth, e.g., from a fast WLAN connection to a rather slow UMTS connection. We evaluate the download times for files by means of simulation while considering different load scenarios in today’s and future network layouts of the B3G network. As a result of the performance evaluation, we derive a new time-based cooperation strategy that counters the impact of mobility. Instead of downloading individual blocks of a file, a user gets a time slot at a providing peer. We show that this leads to a significant performance gain.
P2P‐based Network and Service Operation for the Emerging Future Internet
, 2007
"... Peer-to-Peer (P2P) computing is a networking and distributed computing paradigm which has become highly popular in the wired Internet. It permits users or entities to share their resources, e.g. bandwidth, files or CPU cycles, by direct, symmetric interaction. P2P services are end-user applications ..."
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Peer-to-Peer (P2P) computing is a networking and distributed computing paradigm which has become highly popular in the wired Internet. It permits users or entities to share their resources, e.g. bandwidth, files or CPU cycles, by direct, symmetric interaction. P2P services are end-user applications and P2P-based networking fundamentals. These services form
of Information Sharing Platforms
, 2005
"... Recently, centrally controlled information distribution systems are rapidly emerging to decentralized structures. This tendency can be observed in software distribution applications using BitTorrent or information sharing platforms based on distributed hash table structures like Chord or Kademlia. T ..."
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Recently, centrally controlled information distribution systems are rapidly emerging to decentralized structures. This tendency can be observed in software distribution applications using BitTorrent or information sharing platforms based on distributed hash table structures like Chord or Kademlia. To ensure that the emerging platforms will function properly with a growing number of users and services the issue of scalability turned into one of the hottest research topics. Traditionally, the term scalability often restricts to the functional scalability, which describes the scalability in terms of the system size. In this regard the basic structure is stationary, i.e. it does not fluctuate frequently. However, when the stochastic behavior of system components, the network structure, and user applications has to be taken into account, the stochastic scalability has to be investigated in the context of performance evaluation. In this paper we discuss the stochastic scalability of information sharing platforms. We give a classification of current information sharing platforms and define the terms functional and stochastic scalability in detail.
Time-Discrete Analysis of the Crawling Strategy in an Optimized Mobile P2P Architecture
, 2005
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Telecommunication Systems manuscript No. (will be inserted by the editor) Integrating Mobile Cellular Devices into Popular Peer-to-Peer Systems
"... Copyright and Reference Information: This material (preprint, accepted manuscript, or other author-distributable version) is provided to ensure timely dissemination of scholarly work. Copyright and all rights therein are retained by the author(s) and/or other copyright holders. All persons copying t ..."
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Copyright and Reference Information: This material (preprint, accepted manuscript, or other author-distributable version) is provided to ensure timely dissemination of scholarly work. Copyright and all rights therein are retained by the author(s) and/or other copyright holders. All persons copying this work are expected to adhere to the terms and constraints invoked by these copyrights. This work is for personal use only and may not be redistributed without the explicit permission of the copyright holder. The definite version of this work is published as [·] Andreas Berl and Hermann De Meer. Integration of mobile cellular devices into popular peer-to-peer networks. Telecommunication Systems, Volume 48, pages [NA], 2011. The original publication is available at www.springerlink.com.
