The UltraSAN modeling environment
Performance Evaluation - Special issue: performance modeling tools
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)
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
On the Effects of Outages on the QoS of GPRS Networks under Different User Characterizations
EDCC-4 Proceedings of the 4th European Dependable Computing Conference on Dependable Computing
Service-Level Availability Estimation of GPRS
IEEE Transactions on Mobile Computing
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Abstract: The General Packet Radio Service (GPRS) extends the Global System Mobile Communications (GSM) by addressing packet-oriented traffic. Availability is the most important dependability requirement for such Communication Systems as GPRS. Focusing on the contention phase, where users compete for channel reservation, this paper analyses the GPRS with the objective to understand its behaviour under critical conditions, as determined by periods of outages, which significantly impact on the resulting dependability. In fact, during outages (service unavailability), users trying to access the service accumulate, leading to an overload of the system. When the system resumes its operations, the accumulated users determine a higher probability of collisions on resources assignment (and therefore a degradation of the QoS perceived by the users). Our analysis, performed using a simulation approach, allowed to gain insights on the impact of outages on the QoS and of the overload that GPRS systems have to face after outages.