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Simulative performance evaluation of a mobile peer-to-peer file-sharing system
- In Next Generation Internet Networks NGI2005
, 2005
"... Abstract — Peer-to-Peer (P2P) file-sharing has become the killer application in the wired Internet and might also be highly attractive for mobile networks. In particular since UMTS operators are searching for new applications which do both: a) exploit the potential of the UMTS technology and b) moti ..."
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Abstract — Peer-to-Peer (P2P) file-sharing has become the killer application in the wired Internet and might also be highly attractive for mobile networks. In particular since UMTS operators are searching for new applications which do both: a) exploit the potential of the UMTS technology and b) motivate the user to adopt the new technology. In this work we are investigating the performance of an eDonkey-based mobile P2P file-sharing system by means of time-dynamic simulation. Mobile networks differ from wireline networks by the limited capacity of the radio link and the mobility of the users. P2P networks, in contrast, are overlays which consider the transport network in an abstract way. In a mobile environment, the question arises, whether the abstraction can be maintained and what will be the performance impact if there is any. We will show in detail how the mobile access technology (GPRS or UMTS), the churn behavior of mobile users, the file size of mobile specific content, and special infrastructure entities, such as a cache peer, influences the performance of the suggested mobile P2P file-sharing service. I.
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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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.
Towards a P2P-Based GeoCollaboration System for Disaster Management
- In Proceedings of the GI-Days 2007—Young Researchers Forum
, 2007
"... Abstract. GeoCollaborative applications used for disaster management are usually client/server architectures. As disaster management inherently hap-pens in highly dynamic environments, these applications suffer from defi-ciencies with respect to maintaining connections to the server representing the ..."
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Abstract. GeoCollaborative applications used for disaster management are usually client/server architectures. As disaster management inherently hap-pens in highly dynamic environments, these applications suffer from defi-ciencies with respect to maintaining connections to the server representing their sole source of information. We propose to exploit peer-to-peer net-works to interconnect field workers. Consequently, one active connection between one peer and the control room at a time is sufficient to perpetuate the disaster management system. The data can be further exchanged in the local network established by the peers, resulting in a consistent data set and an increased availability of the GeoCollaborative application. 1 PROBLEM STATEMENT Disaster management is highly complex. In the response phase (c.f. Leit-inger 2004) right after the emergency occurrence, the officer-in-charge situated in the disaster control room has to make fast and reliable decisions to rescue or help the affected population. To cope with this situation suc-
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.
Context-Aware P2P Middleware for Mobile Wellness Applications
"... Low amounts of physical exercise are known to expose people to many health hazards. Modern lifestyle involves a reduction in the amount of physical exercise we are required to take during our daily activities, which should be compensated with increased spontaneous exercise. However, people tend to m ..."
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Low amounts of physical exercise are known to expose people to many health hazards. Modern lifestyle involves a reduction in the amount of physical exercise we are required to take during our daily activities, which should be compensated with increased spontaneous exercise. However, people tend to make short-sighted decisions related to their way of life. In this work, we present a novel concept of a mobile application designed to motivate people to work out and to enable more e ¢ cient training. Sharing training programs and results within peer groups is at the heart of the concept. Potential users of the application include sports enthusiasts as well as professional athletes and their coaches. Development of a prototype of the application for the Series 60 smartphone platform is facilitated by utilizing a middleware of our own making. The middleware features peer-to-peer-oriented communication services with dynamic support for di¤erent communication protocols and connectivities. We discuss the architectures of both the application and the middleware at a detailed level, and compare the prototypes with existing research work and commercial applications. To gain knowledge of the feasibility of the concepts, we analyze the prototypes in various ways, including estimating the resource savings gained by utilizing the middleware and performing delay measurements. Furthermore, an end-user evaluation provides information about usability and utility mostly regarding the sports application. It was discovered that the user evaluation results were negatively a¤ected by shortcomings of the prototype implementations. However, the concepts were found feasible in all of our tests and the novel features of the middleware prototype work as expected.
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
HELSINKI UNIVERSITY ABSTRACT OF THE
, 2006
"... Since the beginning of the decade, a dominant part of Internet traffic has been generated by various Peer-to-Peer (P2P) applications. According to some studies, even 80 % of Internet traffic in the subscriber networks is peer-to-peer. Indeed, the peer-to-peer networking has established itself as the ..."
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Since the beginning of the decade, a dominant part of Internet traffic has been generated by various Peer-to-Peer (P2P) applications. According to some studies, even 80 % of Internet traffic in the subscriber networks is peer-to-peer. Indeed, the peer-to-peer networking has established itself as the killer application of the decade. As the mobile phones are getting more network bandwidth, processing power, and storage capacity, the mobile phone users are starting to lust after the services that have been traditionally available only in the fixed networks; one of these services is the peer-to-peer file sharing. The main objective of this thesis was to find out how a mobile peer-to-peer file sharing application could be implemented using the Session Initiation Protocol (SIP) as the underlying signaling protocol. The feasibility of the concept was evaluated by measuring the message sizes, signaling delays and transmission bandwidth in the network. The thesis is divided into two parts. First, in the literature part we review the work done on the peer-to-peer networking, and discuss special requirements posed by the mobile networks. Then, in the second part we present our implementation of a mobile
Geo-collaboration and P2P Geographic Information Systems: Current Developments and Research Challenges
"... Geo-collaboration appears when individuals or groups of individuals work together to solve spatial decision-making problems facilitated by geospatial information technologies. In this paper we focus on current developments in geo-collaboration where we take an example of public participatory geoinfo ..."
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Geo-collaboration appears when individuals or groups of individuals work together to solve spatial decision-making problems facilitated by geospatial information technologies. In this paper we focus on current developments in geo-collaboration where we take an example of public participatory geoinformation systems (PP GIS). This research field focuses on the issues related to the participation of the general public in democratic processes. PP GIS applications usually adhere to classical client/server architectures. In this paper we call for additional research in P2P computing related to its possible use in applications which support spatial decision-making processes. We conclude the paper with a summary of relevant research issues and our further research work. 1.
Time-Discrete Analysis of the Crawling Strategy in an Optimized Mobile P2P Architecture
, 2005
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