Chair of Computer Networks and Computer Communications
Publication database

Publication database

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

Search

Author:  
All :: A, B, C, D, H, K, L, P, R, S, W 
All :: Barner, Berczes, Bolch 
Preferences: 
References per page: Show keywords Show abstracts

2014

Journal articles:

pdf
Tien V. Do, Patrick Wuechner, Tamas Berczes, Janos Sztrik and Hermann De Meer
A New Finite-source Queueing Model for Mobile Cellular Networks Applying Spectrum Renting
Asia Pacific Journal of Operational Research (APJOR), 31(2):1440004:1-19
2014

Keywords: Mobile cellular networks; Retrial queues; Finite-source; Impatience; Spectrum renting; Discount factor

Tags: MOSEL2, Socionical, EINS_NoE

Abstract: This paper proposes a retrial queueing model with the finite number of sources to evaluate the performance of spectrum renting in mobile cellular networks. The model incorporates necessary ingredients such as the finite number of subscribers, their impatience and a queue for the outbound service. To consider the specific feature of spectrum renting and the current mobile cellular technology, a variable number of servers that are switched on and off in groups is introduced. We present a novel way to take into account the renting fee, which can be used to fine-tune the operation of the spectrum renting procedure. Numerical results show that it is still profitable to initiate a spectrum renting request at high loads, even if no discount is offered by the frequency bands? owners.

Note: (c) World Scientific Publishing Co. & Operational Research Society of Singapore

2008

Booklets:

default
Patrick Wuechner, Christopher Auer, Gunter Bolch and Hermann De Meer
Queueing Networks and Markov Chains - 2nd Edition: Problems and Solutions
distributed by John Wiley & Sons
2008

Tags: MOSEL2

Abstract: In 2006, the second edition of our textbook on ?Queueing Networks and Markov Chains ? Modeling and Performance Evaluation with Computer Science Applications? was published. With completion of this solution manual, we are now pleased to offer additional support to lecturers who want to use the book for course work and assignments. In order to reserve the full benefit of the solution manual to lecturers, it may be worthwhile noting that access to the solution manual has been limited to lecturers only and access can only be gained through presentation of sufficient credentials to the publisher.

2007

Conference and workshop papers:

pdf
Patrick Wuechner, Hermann De Meer, Gunter Bolch, Janos Roszik and Janos Sztrik
Modeling Finite-Source Retrial Queueing Systems with Unreliable Heterogeneous Servers and Different Service Policies Using MOSEL
In Khalid Al-Begain, Armin Heindl and Miklos Telek, editor, Proc. of the 14th Int'l Conf. on Analytical and Stochastic Modelling Techniques and Applications (ASMTA 2007) , page 75--80.
2007
ISBN: 0-9553018-4-X (Print); 0-9553018-3-1 (CD)

Keywords: Performance and Reliability Evaluation; Retrial Queuing System Model; Unreliable Heterogeneous Servers

Tags: DFG_MathMod, EuroFGI, MOSEL2

Abstract: This paper deals with the performance analysis of multiple server retrial queueing systems with a finite number of homogeneous sources of calls, where the heterogeneous servers are subject to random breakdowns and repairs. The requests are serviced according to Random Selection and Fastest Free Server disciplines. The novelty of this investigation is the introduction of different service rates and different service policies together with the unreliability of the servers, which has essential influence on the performance of the system, and thus, it plays an important role in practical modeling of computer and communication systems. All random variables involved in the model construction are assumed to be exponentially distributed and independent of each other. The main steady-state performability measures are derived, and several numerical calculations are carried out by the help of the MOSEL tool (Modeling, Specification and Evaluation Language) under different service disciplines. The numerical results are graphically displayed to illustrate the effect of failure rates on the mean response time and on the overall system utilization.

2006

Journal articles:

pdf
Patrick Wuechner, Hermann De Meer, Joerg Barner and Gunter Bolch
A brief Introduction to MOSEL-2
Transactions Automated Control Systems, 1:210--214
2006
ISSN: 1512-3979

Tags: EuroFGI, EuroNGI, MOSEL2

Abstract: The versatile MOdeling, Specification and Evaluation Language is the core element of the MOSEL-2 tool. This description languages provides a high-level means for specifying models, performance measures, and the graphical presentation of results. The description languages is implemented in form of an evaluation environment that comprises translators to the modeling languages of several third-party performance evaluation tools that evaluate the specified model.

Conference and workshop papers:

pdf
Patrick Wuechner, Hermann De Meer, Joerg Barner and Gunter Bolch
A brief Introduction to MOSEL-2
In Reinhard German and Armin Heindl, editor, Proc. of the 13th GI/ITG Conf. on Measurement, Modelling and Evaluation of Computer and Communication Systems (MMB 2006) , page 473--476.
GI/ITG/MMB, University of Erlangen
Publisher: VDE Verlag,
2006
ISBN: 978-3-8007-2945-6

Tags: EuroFGI, EuroNGI, MOSEL2

Abstract: The versatile MOdeling, Specification and Evaluation Language is the core element of the MOSEL-2 tool. This description languages provides a high-level means for specifying models, performance measures, and the graphical presentation of results. The description languages is implemented in form of an evaluation environment that comprises translators to the modeling languages of several third-party performance evaluation tools that evaluate the specified model.

Technical reports:

pdf
Gunter Bolch, Janos Roszik, Janos Sztrik and Patrick Wuechner
Modeling Finite-Source Retrial Queueing Systems with Unreliable Heterogeneous Servers and Different Service Policies using MOSEL
Document number: MIP-0611
Faculty of Computer Science and Mathematics (FIM), University of Passau,
2006

Tags: DFG_MathMod, EPSRC_P2POpt, EuroFGI, EuroNGI, MOSEL2

Abstract: This paper deals with the performance analysis of multiple server retrial queueing systems with a finite number of homogeneous sources of calls, where the heterogeneous servers are subject to random breakdowns and repairs. The requests are serviced according to Random Selection and Fastest Free Server disciplines. The novelty of this investigation is the introduction of different service rates and different service policies together with the unreliability of the servers, which has essential influence on the performance of the system, and thus it plays an important role in practical modeling of computer and communication systems. All random variables involved in the model construction are assumed to be exponentially distributed and independent of each other. The main steady-state performability measures are derived, and several numerical calculations are carried out by the help of the MOSEL tool (Modeling, Specification and Evaluation Language) under different service disciplines. The numerical results are graphically displayed to illustrate the effect of failure rates on the mean response time and on the overall system's utilization.

2005

Conference and workshop papers:

pdf
Patrick Wuechner, Hermann De Meer, Joerg Barner and Gunter Bolch
MOSEL-2 - A Compact But Versatile Model Description Language And Its Evaluation Environment
Proc. of the Workshop MMBnet 2005
Publisher: University of Hamburg,
2005

Keywords: MOSEL-2; Model description language; Evaluation environment; Performance modeling

Tags: EuroNGI, MOSEL2

Abstract: In this paper we present the current version of the MOdeling, Specification and Evaluation Language MOSEL-2 and show its applicability for performance and reliability modeling and evaluation of systems with Markovian and non-Markovian behavior. The tool MOSEL-2 consists of two major components: the description language and the evaluation environment. The description language is the core element of MOSEL-2 and provides a high-level means for specifying models, performance measures, and the graphical presentation of the results of these measures. MOSEL-2?s evaluation environment includes a set of model translators that allow automatic translation of MOSEL-2 models to the model descriptions of several third-party performance evaluation tools. MOSEL-2 uses these tools to evaluate the model by numerical analysis or simulation. The results returned are collected by MOSEL-2 and presented in a unified textual and graphical form. This novel concept exempts the users from learning a new model specification language and rewriting all models each time they have to change a probability distribution within their models. A new and unique concept has been added that allows the automatic approximation of non-Markovian distributions by Markovian constructs. The goal of our ongoing research is to enhance the modeling and evaluation power of MOSEL-2 steadily. This paper aims to give an introduction to the current version of the MOSEL-2 language and its evaluation environment demonstrating the most recent improvements.

2004

Conference and workshop papers:

pdf
Patrick Wuechner, Khalid Al-Begain, Joerg Barner and Gunter Bolch
Modelling a single GSM/GPRS cell with delay tolerant voice calls using MOSEL-2
In David Al-Dabass, editor, Proc. of the 7th UK Simulation Conf. (UKSIM 2004) , page 88--94.
2004
ISBN: 1-84233-099-3

Keywords: MOSEL-2; System description language; GSM/GPRS; DeTVoC; non-Markovian distributions; IGL

Tags: MOSEL2

Abstract: In this paper we introduce the new version of the MOdelling, Specification and Evaluation Language -- now called MOSEL-2 -- and prove its applicability for performance modelling of mobile networks with non-Markovian models. Like its predecessor MOSEL [Al-Begain et al, 2001], MOSEL-2 was developed at the Institute for Operating Systems at the University of Erlangen-Nuernberg. In contrast to many specification languages of existing performance modelling and evaluation tools, which often tend to be too verbose, most MOSEL-2 specifications are compact but anyhow easy to understand. Moreover, MOSEL-2 provides means by which many interesting performance or reliability measures and the graphical presentation of them can be specified straightforwardly. It is especially easy to evaluate a model with different sets of system parameters. The benefit of MOSEL-2 -- especially for the practitioner from the industry -- lies in its modelling environment: A MOSEL-2 model is automatically translated into various tool-specific system descriptions and then analysed or simulated by the appropriate tools. This exempts the modeller from the time-consuming task of learning different modelling languages. The following tools and evaluation methods are currently supported by MOSEL-2: MOSES [Bolch et al, 1994] provides several iterative and direct methods (Jacobi, Gauss Seidel, LPU, Crout and Grassmann) for analysing Markovian models, SPNP [Hirel et al, 2000] provides several numerical methods for solving Markovian models and discrete event simulation for evaluating non-Markovian models like extended stochastic Petri nets (ESPNs) and TimeNET [Zimmermann et al, 1999] provides numerical methods for solving Markovian and a restricted class of models with non-exponentially distributed transitions and moreover is able to simulate extended deterministic stochastic Petri nets (eDSPNs). Nevertheless, currently more endeavours are made to include even more evaluation tools and pre-processor concepts to enhance the modelling and evaluation power of MOSEL-2. This Paper aims to give an introduction to the MOSEL-2 language and environment and describe how easily the air interface of a GSM/GPRS cell can be modelled.

Export as:
BibTeX, XML