The UltraSAN modeling environment
Performance Evaluation - Special issue: performance modeling tools
Availability of CAUTRA, a Subset of the French Air Traffic Control System
IEEE Transactions on Computers
EDCC-2 Proceedings of the Second European Dependable Computing Conference on Dependable Computing
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)
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
Model-based evaluation of a radio resource management system for wireless networks
Proceedings of the 1st conference on Computing frontiers
Evaluation of the impact of congestion on service availability in GPRS infrastructures
ISAS'05 Proceedings of the Second international conference on Service Availability
A modular approach for model-based dependability evaluation of a class of systems
ISAS'04 Proceedings of the First international conference on Service Availability
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The General Packet Radio Service (GPRS) extends the Global System Mobile Communication (GSM) by introducing a packet-switched transmission service. This paper analyzes the GPRS behavior under critical conditions. In particular, we focus on outages, which significantly impact the GPRS dependability. In fact, during outage periods, the cumulative number of users trying to access the service grows proportionally over time. When the system resumes its operations, the overload caused by accumulated users determines a higher probability of collisions on resources assignment and, therefore, a degradation of the overall QoS. This paper adopts a Stochastic Activity Network modeling approach for evaluating the dependability of a GPRS network under outage conditions. The major contribution of this study lies in the novel perspective the dependability study is framed in. Starting from a quite classical availability analysis, the network dependability figures are incorporated into a very detailed service model that is used to analyze the overload effect GPRS has to face after outages, gaining deep insights on its impact on user's perceived QoS. The result of this modeling is an enhanced availability analysis, which takes into account not only the bare estimation of unavailability periods, but also the important congestion phenomenon following outages that contribute to service degradation for a certain period of time after operations resume.