Otso Kassinen

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The phenomenon of churn has a significant effect on the performance of Peer-to-Peer (P2P) networks, especially in mobile environments that are characterized by intermittent connections and unguaranteed network bandwidths. A number of proposals have been put forward to deal with this problem; however, we have so far not seen any thorough analysis to guide(More)
In this paper, we present a system for the distributed management of user communities. The system utilizes multiple DHT overlay networks where nodes communicate in a peer-to-peer manner. Our system works on top of a P2PSIP protocol implementation that carries out the DHT signaling. The key idea behind our system is to use one overlay network per community;(More)
—We evaluate the battery life of mobile devices that act as full-fledged peer nodes in a Kademlia DHT based P2P overlay network. The motivation is to find out how long a mobile peer is able to function in a UMTS or WLAN access network, and how the different parameter settings affect this battery life; this is interesting as mobile access to P2P networks is(More)
This paper proposes an intelligent mobile middleware utilizing group-based content push with dynamic session startup and plug-and-play features. Solution enhances the distribution of mobile content, such as game applications or multimedia files, within a peer group community. It exploits the social relationships of the user community to enable instant(More)
We present the feasibility evaluation of a structured communication-oriented Peer-to-Peer (P2P) system being used in mobile environments in this paper. The different levels of churn are modeled by the exponential distribution with varied value of mean online time. Our system utilizes Kademlia with some modifications as the underlying Distributed Hash Table(More)
Contemporary ubiquitous information systems combine efficiently context-aware and peer-to-peer communication concepts. This paper introduces a novel mobile peer-to-peer (P2P) navigation application, NaviP2P. In addition to basic navigation functionalities such as GPS positioning, showing the user location on the map, scrolling and zooming of the map view,(More)
In this paper, we present the user evaluation results of a Community-centric Music Voting service that relies on a DHT-based P2P network. For each user community, an independent DHT-overlay is established. These separate DHT-overlays are then connected to specific commercial premises or larger areas. A user evaluation was conducted in a real usage(More)
—In this paper, we propose an advanced model, called e-Aware, for estimating how application layer protocol properties affect the energy consumption of mobile devices, operating in 3G (WCDMA) and WLAN (802.11) networks. The main motivation for the model is to facilitate designing energy-efficient networking solutions, by reducing the need for time-consuming(More)
—Despite the huge popularity of peer-to-peer distribution and yet again growing interest towards superdistribution, there is no consensus among researchers regarding the appropriate definition of superdistribution or its different types. There is a similar lack of consistence in the definition of the relation between superdistribution and peer-to-peer(More)
The performance metric is the request accomplishment success ratio in the overlay network. The evaluations are conducted in the presence of churn i.e. the peers' continuous activity of joining and leaving the overlay, which is crucial for realistic simulations. The online and offline time-periods of churning peers follow an exponential distribution. In(More)