The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, we analyze the end-to-end communication activities of a modern mobile phone, Nokia N95, to understand how much energy different communication alternatives consume. In particular, we investigate the interactions when multiple connections are used in parallel. Parallel connections save energy but the gains vary depending on the technology. TCP downloads during 3G voice calls result into...
In this paper we investigate the DHT performance for Peer-to-peer SIP. We analyze performance from the mobile phone perspective. This angle brings battery consumption and efficient use of the limited resources of the mobile devices to the focus. We develop an analytical model of Kademlia DHT performance and use it to analyze a number of different strategies to use peer-to-peer SIP with mobile devices...
BitTorrent-based file-sharing is already available for mobile phones; however, its energy profile makes it difficult to use it for transferring large amount of data. This paper analyzes an alternative cloud-based solution that uses a remote server to download content via BitTorrent and transfer it to the mobile device in a transparent and energy efficient way. The system is evaluated via measurements...
We studied consumer attitudes towards different aspects of mobile peer-to-peer services by administering questionnaires to Finnish consumers using advanced handsets (N = 196). Most of the intention to use non-established services did not materialize as actual usage. Music and software downloading attracted most payment willingness. Legal file sharing stood out as a promising new business model. Respondents...
To understand the technical feasibility and user perception of mobile video, we conducted a two-week trial where a student community used mobile phone and Web technologies to share the events of a campus festival. The questions we investigated included the capability of contemporary smart phones to capture and share the events via real time and stored video; the usage patterns that arise within mobile...
This paper presents a novel mechanism that enables mobile devices to efficiently participate in Distributed Hash Tables (DHTs). By selectively dropping messages, we can significantly reduce traffic and thus the energy consumption of mobile nodes with only minor performance degradation. The protocol extension preserves compatibility with existing widely used DHT systems. We evaluate the solution by...
LAMP is the widely used open source Web development stack for building dynamic Web sites. In this paper, we discuss PAMP (Personal AMP), which is a port of the stack to the Symbian/S60 mobile phone platform. We illustrate the possibilities of PAMP with a couple of examples, share our experiences in bringing the stack to resource-constrained devices, and discuss the lessons learned. The existence of...
Peer-to-peer applications are emerging into mobile devices. However, resource limitations of these devices introduce new challenges for P2P technologies. For instance, there is a need for incentive mechanisms, which address the free riding problem but do not waste devices' battery or communication resources. A centralized and user-identity based incentive mechanism enables mobile users to contribute...
Various incentive schemes have been proposed to force or encourage peers to contribute their resources to peer-to-peer networks. Such schemes are typically designed for peers with fixed Internet connections and do not take the special properties of wireless peers into account. In this paper we propose a P2P credit system especially targeted for the cases where mobile devices join P2P networks. Instead...
Distributed Hash Tables (DHTs) are widely studied from the fixed computer point of view, but very little research has been done on the performance of mobile clients. We have implemented a DHT client for mobile phones and carried out energy measurements to analyze the power profile of the application. By connecting to a widely deployed DHT, we were able to observe how mobile clients perform in a million...
This paper studies various techniques to overcome the barriers that firewalls and NATs cause to peer-to-peer connectivity. In the mobile context firewalls and NATs are typically managed by the mobile operator and are thus beyond the control of the mobile user. Therefore the focus of this paper is on techniques that take advantage of known behaviors of NATs and firewalls. Instead of studying how to...
Battery consumption is an important but not very widely studied aspect of peer-to-peer applications. This paper describes a series of experiments which obtained detailed measurements of BitTorrent energy consumption on handheld devices. The measurements that were carried out with SymTorrent client on three different models of Nokia S60 mobile phones indicate that peer-to-peer content sharing on handhelds...
We will demonstrate how a common mainstream web application development stack, the so-called AMP stack, can be installed on a mobile phone and used for creating a mobile website that utilize the unique characteristics of a mobile personal device. By providing a widely used web application development environment also on the mobile phone, we foresee that the threshold for developing mobile Web sites...
We will demonstrate how an existing content management system, Drupal, can be used on a personal Web site that is running on a mobile phone. It allows users to easily create and configure a Web site to their mobile devices that is able to take advantage of the wide set of normal functionality of the content management system and the context and data of the mobile phone. We estimate that very easy...
During the last years progress in Web search engines has been made to the point that relevant information can be reached easily most of the time. However very little empirical research has been carried to study Web search in highly dynamic social network environments composed of mobile devices. The aim of this work was therefore to investigate novel approaches that took advantage of the social network...
BitTorrent is an efficient peer-to-peer content sharing protocol. In this paper we investigate how this popular technology can be brought to mobile handheld devices. As handheld devices are increasingly used for music and video consumption it is reasonable to consider how a handheld device can join existing communities and be used to find, access, and play multimedia content. The paper is based on...
In this paper we investigate the use of mobile phone as an inspection tool for field force workers. The paper presents the architecture and our experiences with the development and use of a pilot solution for Nokia as a point of sale (POS) review tool. The main focus is on dealing with the special issues faced in the mobile environment and on providing the solution as a service. XForms and the underlying...
In this paper we describe four P2P applications developed for smart phones, ranging from distributed computing to content sharing and search in closed and open user groups. Their common feature relies in the communication interface which has been cellular data transmission (SMS, HSCSD, respectively GPRS). Through our examples we highlight various aspects that application development on smart phones...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.