The UltraSAN modeling environment
Performance Evaluation - Special issue: performance modeling tools
Analysis of the Effects of Outages on the Quality of Service of GPRS Network Systems
DSN '01 Proceedings of the 2001 International Conference on Dependable Systems and Networks (formerly: FTCS)
Modeling and Analysis of the Behavior of GPRS Systems
WORDS '01 Proceedings of the Sixth International Workshop on Object-Oriented Real-Time Dependable Systems (WORDS'01)
Analyzing Quality of Service of GPRS Network Systems from a User's Perspective
ISCC '02 Proceedings of the Seventh International Symposium on Computers and Communications (ISCC'02)
On Petri Net-Based Modeling Paradigms for the Performance Analysis of Wireless Internet Accesses
PNPM '01 Proceedings of the 9th international Workshop on Petri Nets and Performance Models (PNPM'01)
Concepts, services, and protocols of the new GSM phase 2+ general packet radio service
IEEE Communications Magazine
General packet radio service in GSM
IEEE Communications Magazine
Broadband traffic modeling: simple solutions to hard problems
IEEE Communications Magazine
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Standard network QoS analysis usually accounts for the infrastructure performance/availability only, with scarce consideration of the user perspective. With reference to the General Packet Radio Service (GPRS), this paper addresses the problem of how to evaluate the impact of system unavailability periods on QoS measures, explicitly accounting for user characteristics. In fact, the ultimate goal of a service provider is user satisfaction, therefore it is extremely important to introduce the peculiarities of the user population when performing system analysis in such critical system conditions as during outages. The lack of service during outages is aggravated by the collision phenomenon determined by accumulated users requests, which (negatively) impacts on the QoS provided by the system for some time after its restart. Then, depending on the specific behavior exhibited by the variety of users, such QoS degradation due to outages may be perceived differently by different user categories. We follow a compositional modeling approach, based on the GPRS and user models; the focus is on the GPRS random access procedure on one side, and different classes of users behavior on the other side. Quantitative analysis, performed using a simulation approach, is carried out, showing the impact of outages on a relevant QoS indicator, in relation with the considered user characteristics and network load.