Mobile Computing Activity

    New paradigms in wireless access and spectrum markets are being formed. This is accelerated even further by the advances in the dynamic spectrum access. The cognitive radio network (CRN) technology empowers devices with new degrees of flexibility, enabling new network architectures, access methods, and services, enriching the roles of service providers, and opening new opportunities for businesses cases. Unlike the traditional cellular-based markets, these spectrum markets have larger sizes, are more heterogeneous, and can offer an improved set of services. As wireless access and use increase, users are differentiated even more by their usage and data-rate requirement profile. The main objective of this research is the development of a /modular multi-level modeling framework and simulation platform/, that enables the business-driven comparative analysis of various spectrum and access markets and services. The analysis will consider a diverse set of customer populations and QoE-based performance metrics from the perspective of providers, customers, and regulators.

Representative publications:

• Georgios Fortetsanakis, Maria Papadopouli, Gunnar Karlsson, Manos Dramitinos, Emre A. Yavuz . To subscribe, or not to subscribe: Modeling and analysis of service paradigms in cellular markets. IEEE DySPAN, Bellevue, Washington, USA, October 16-19, 2012 [PDF]

    The u-map is a novel user-centric geo-database that supports wireless access markets. It enables clients to upload information about their profile, their quality-of-experience (QoE) feedback for a service, traffic demand, network/spectrum conditions (e.g., interference, coverage), providers, and their position (e.g., GPS-based measurements) in a spatio-temporal geo-database. To evaluate the impact of the u-map on wireless access markets and study the evolution of such markets, we have developed an economic-driven modeling framework. The framework integrates models of the channel, clients and network operators, wireless infrastructures, types of interaction, and price adaptation in a modular manner. The u-map was analyzed by simulating the evolution of a cellular-based duopoly, with various cellular users. The analysis demonstrates that the u-map can be beneficial to users in their network operator selection process.In addition, a proof-of-concept implementation of the u-map has been developed. Evaluation studies using this testbed is an on-going activity.

Representative publications:

• Georgios Fortetsanakis, Michalis Katsarakis, Maria Plakia, Nick Syntychakis, and Maria Papadopouli. "Supporting Wireless Access Markets with a User-centric QoE-based Geo-database", ACM MobiArch 2012, Istanbul, Turkey, August 22, 2012.[PDF] [video]