Technical and Usage Issues for Mobile Multiplayer Games.

This paper presents the results of an undergoing projectdealing with issues for mobile multiplayer games. First ittakes a technical point of view. It presents our work-inprogresson the following issues: Communicationmiddleware (through a prototype compliant to the OpenMobile Alliance specifications), high level communicationabstractions (which can be provided to multiplayer games),latency awareness (through a prototype mixing high latencyGPRS communications with low latency Bluetoothcommunications), consistency (taking into account mobilephone limited resources), and databases (investigating threesolutions based on grid DBMS). Our work also studiessociological and psychological aspects. After presenting themethodology used for the study, it shows how mobilegaming provides a second skin to its player (giving him theability to withdraw from others, or to stay present to them),and is a tool for socialisation and appropriating time (byfavouring a feeling of mastery). This last point suggests thatmobile multiplayer games can only be appreciated if theytake into account player’s time constraints

Enhancing context data distribution for the internet of things using QoC-awareness and attribute-based access control

International audienceThe Internet of Things (IoT) enables producers of context data like sensors to interact with remote consumers of context data like smart pervasive applications in an entirely decoupled way. However, two important issues are faced by context data distribution, namely providing context information with a sufficient level of quality-i.e. quality of context, QoC-while preserving the privacy of context owners. This article presents the solutions provided by the INCOME middleware framework for addressing these two potentially contradictory issues while hiding the complexity of context data distribution in heterogeneous and large-scale environments. Context producers and consumers not only express their needs in context contracts but also the guarantees they are ready to fulfil. These contracts are then translated into advertisement and subscription filters to determine how to distribute context data. Our experiments on a first open source prototype show that QoC-based filtering and privacy protection using attributed-based access control can be performed at a reasonable cos