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This paper presents a framework for multiuser distributed virtual environments (VEs) and explores its application to teleoperation of a mobile robot over the Internet. The proposed framework, incorporating the functional and the interconnection models, attempts to represent common functionality, communication issues, and requirements found in distributed(More)
A framework for multi-user distributed virtual environments (DVEs) has been proposed. The proposed framework, incorporating two models (the functional model and the interconnection model), attempts to represent the common functionality, communication issues and requirements found in multi-user DVEs. The functional model concentrates on the DVE's(More)
utonomous Underwater Vehicles (AUVs) share common A control problems with other air, land, and water unmanned vehicles. In addition to requiring high-dimensional and compu-tationally intensive sensory data for real-time mission execution, power and communication limitations in an underwater environment make it more difficult to develop a control(More)
The paper presents a model for Quality of Service (QoS) sig-naling for complex multimedia services in the next generation network (NGN), from establishing necessary QoS support at session setup, to further QoS modifications in response to dynamic changes during the session. The model aims to maximize user perceived quality, while taking into account(More)
The diameter base protocol, originally developed by the Internet Engineering Task Force (IETF), provides the authentication, authorization and accounting (AAA) functionality needed for network access and mobility in IP-based networks. Diameter has also been adopted by the Third Generation Partnership Project (3GPP) and other standards bodies as an AAA(More)
The IP Multimedia Subsystem (IMS) has been recognized as a reference next generation network architecture for offering multimedia services over an Internet Protocol (IP) based infrastructure. One of the key benefits of the IMS is efficient and flexible introduction of new services and access to third-party application providers, thanks to standard(More)
– Providing Massively Multiplayer Online Role-Playing Games (MMORPGs) is a big challenge for future mobile, IP-based networks. Understanding how the players' actions affect the network parameters, the game platform, and the overall perceived quality is highly relevant for the purposes of game design, as well as for the networking infrastructure and network(More)
E-Health services comprise a broad range of healthcare services delivered by using information and communication technology. In order to support existing as well as emerging e-Health services over converged next generation network (NGN) architectures, there is a need for network QoS control mechanisms that meet the often stringent requirements of such(More)
In this paper we present the modeling of player behavior for Massively Multiplayer Online Role-Playing Games (MMORPGs). We have performed action specific measurements of player sessions in terms of the previously defined action categories for MMORPGs (Trading, Questing, Dungeons, Raiding, and Player versus Player Combat). We explore the hourly trends in(More)