Mobility management is an important task in wireless networks. The Mobile IP protocol provides a basic solution to the mobility management. However, Mobile IP suffers from several problems. In this paper, we propose an enhancing version of Mobile IP by using the Peer-to-Peer (P2P) network technology. We organize home agents into P2P networks and use the Domain Name System (DNS) to provide the u...

Firms in mobile telephone markets charge one another for delivering calls to subscribers. These so-called termination charges are controversial from a policy perspective since they are fairly high and stable. We present a model of consumer and firm behavior in mobile markets in order to identify the role of termination charges in determining the market equilibrium. We analyze three segments of ...

This paper examines the use of mobile telephony in public spaces. It looks into the issue of how and why mobile telephony is seen as being disturbing. The two major issues are first, the way in which the device disturbs the web of front and back channel interactions found in a social setting and second the difficulties of managing issues surrounding eavesdropping and courtesy. The paper bases i...

Infovox is marketing a speaker-dependent, pattern-matching word recognition system, developed at KTH. The algorithms in the system have been modified for noise immunity, and performance has been evaluated in moving cars. The main problems were word detection and noise compensation. After simulations we decided to use a close-talking microphone and a "noise addition" method, where we added the m...

Gaps in the rates of digital inclusion continue to plague certain socio-economic segments of the American economy. For these groups, the migration path towards mobile computing and digital inclusion may transpire from 2G voice centric mobile telephone to the data centric smartphone or wireless PDA. This study investigates what socio-economic factors are determinative to the diffusion of mobile ...

Models of mobile web user behavior have broad applicability in fields such as mobile network optimization, mobile web content recommendation, collective behavior analysis, and human dynamics. This paper proposes and evaluates URI model, a novel approach to analyze user mobile Web usage behavior, which combines user interest modeling with location analysis. The URI model takes as input mobile us...

Today most mobile telephones come equipped with a camera. This gives rise to interesting new possibilities for applications of computer vision, such as building recognition software running locally on the mobile phone. Algorithms for building recognition need to be robust under noise, occlusion, varying lighting conditions and different points of view. We present such an algorithm using local i...

This paper presents a double-digit system for textdependent speaker verification and text validation that can be accessed with security via a telephone network. A speech recognition and a user authentication scheme are proposed that utilize concatenated phoneme HMMs and operate in a sound-prompted mode. The recognition performance of the system is evaluated through extended simulations on Hidde...

This paper describes the design and implementation of an SMS transmission system using the PDU (Protocol Data Unit) mode of a GSM (Global System for Mobile Communications) modem. The system may be used in several applications: telemetry or remote control, using short messages from a standard GSM mobile phone, and in other application circuits. In order to perform these applications, coding and ...

While the conditions of the analysis, design, and growth of telephone mobile services have been studied extensively in the United States, Asia, and Europe, the same level of attention has not been given to these conditions in Latin America from an academic perspective. The principal objective of this study is to present a conceptual framework that permits understanding and design of different b...