Our Publications
Author: Piotr Zwierzykowski
Title: Modelowanie mechanizmów zarządzania ruchem w wielousługowych sieciach komórkowych (Modelling traffic management mechanisms in multiservice~mobile~networks)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 2014
ISBN: 9788377753422
Along with the development of mobile networks and their increasing technological capabilities, a need for a development of methods that would introduce effective and reliable methods for the evaluation of the traffic capacity of networks has become apparent. The introduction of advanced traffic management mechanisms implies, however, that new developments, or modifications to already existing methods for modelling of interfaces in the mobile network, are required.
The present monograph is devoted to the construction of analytical models of multirate mobile networks that would take into consideration not only traffic management mechanisms deployed in access network interfaces, but also a possibility of servicing a mixture of traffic with different properties and different quality requirements.
The most important results of the research studies presented in the monograph include a development of analytical multi-service systems in which the following traffic management mechanisms have been implemented: the mechanism of prioritization for all or some selected traffic classes, the non-threshold compression mechanism, unidirectional threshold compression mechanism, bidirectional threshold compression mechanism, and the mechanism of multiple hysteresis of calls.
This work also proposes a number of methods for a determination of the blocking probability in multirate mobile networks with multicast connections and the application of different traffic management mechanisms.
The effectiveness of the proposed methods for modelling multi-rate systems with management mechanisms has been verified by simulation methods. The conducted research study clearly indicates high accuracy of the results of the calculations obtained for all analytical models under scrutiny.
Authors: Maciej Stasiak, Mariusz Głąbowski, Arkadiusz Wiśniewski and Piotr Zwierzykowski
Title: Modelling and Dimensioning of Mobile Networks: From GSM to LTE.
Publisher: John Wiley & Sons
Year of publication: 2010
ISBN: 9780470665862
This book is a must-read for all network planners and other professionals wishing to improve the quality and cost efficiency of 3G and LTE networksIn this book, the authors address the architecture of the 2/3G network and the Long Term Evolution (LTE) network. The book proposes analytical models that make the analysis and dimensioning of the most important interfaces, i.e. WCDMA or Iub, possible. Furthermore, the authors include descriptions of fundamental technological issues in 2/3 G networks, basic traffic engineering models and frequent examples of the application of analytical models in the analysis and dimensioning of the interface of cellular networks. The specific knowledge included in the content will enable the reader to understand and then to prepare appropriate programming softwares that will allow them to evaluate quality parameters of cellular networks, i.e. blocking probabilities or call losses. Additionally, the book presents models for the analysis and dimensioning of the Wideband Code Division Multiple Access (WCDMA) radio interface and the Iub interface, both carrying a mixture of Release 99 traffic (R99) and High-Speed Packet Access (HSPA) traffic streams. Finally, the analytical models presented in the book can be also used in the process of modeling and optimization of LTE networks.
Author: Grzegorz Danilewicz
Title: Pola komutacyjne dla połączeń rozgłoszeniowych (Optimization of Multicast Nonblocking Switching Networks)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 2009
ISBN: 9788371438264
Consistent theory devoted to multi-plane space-division banyan-type multicast switching networks is presented in this thesis.
A log2(N, 0, p) and log2(N, m, p) structures up to now considered in the literature are presented. Graph representation of these structures is discussed. Such switching networks have some required properties and are considered as optical switching networks. Up to now, 2 x 2 directional couplers and other 2 x 2 switches are considered as optical switching elements and therefore log2(N, 0, p) and log2(N, m, p) switching networks were studied. A new technology will allow to build optical switching elements of larger capacity in the near future. This fact permits to focus on multi-plane banyan-type switching networks which are constructed of switching elements with more than 2 inlets and more than 2 outlets.
The new nonblocking conditions for multicast multi-plane logd(N, 0, p) and logd(N, m, p) switching networks are introduced in the study . Up to now, such conditions were not considered in the literature. Additionally , a control algorithm which is based on variable-size blocking windows is presented. Multicast logd(N, 0, p) and logd(N, m, p) switching networks are wide-sense nonblocking under presented algorithm.
An optimization of multi-plane banyan type switching networks constructed of symmetric switching elements of any capacity is considered. Optimal structures for minimum number of crosspoints and minimum number of switches are presented. Beside optimal structures also universal architectures are investigated. Such architectures depend only on one parameter - switching element’s capacity . It was shown that in the wide range of switching network capacities optimal structures are built of switches of capacity larger than 2 x 2.
Author: Mariusz Głąbowski
Title: Modelowanie systemów multi-rate ze strumieniami zgłoszeń BPP (Modelling of Multi-Rate Communication Systems Servicing BPP Call Streams)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 2009
ISBN: 9788371438363
The present work proposes a coherent methodology for modelling communications systems servicing Binomial-Poisson-Pascal (BPP) call streams.
In the first part of the work the author distinguishes four classes of communications systems, with the dependence of the admission process and the call arrival process on the occupancy state of the system as the identifying criterion. A critical overview of the methods for the analysis of multi-service multi-rate systems is presented. Then the class of product state-dependent systems is defined, for which a recursive effective algorithm for determining the occupancy distribution and the blocking/loss probability of offered call streams is proposed. Additionally, a hybrid algorithm for modelling state-dependent systems is proposed. The algorithm allows one to obtain a direct and simple dependence between occupancy distributions determined in a system with state-independent call admission process and in a system with state-dependent call admission process of new calls. The worked out methods for a determination of traffic characteristics of state-dependent systems were used to model a large group of link groups that are commonly used in communications networks.
The next part of the work proposes analytical methods for modelling multi-service hierarchical networks with traffic overflow. A new method for determining the parameters of multi-rate overflow traffic has been worked out both for finite and infinite number of traffic sources generating call streams. A method for determining the occupancy distribution and the blocking/loss probability in groups servicing multi-service overflow traffic is proposed.
The last part of the work puts forward new methods for modelling multi-stage switching networks with BPP traffic, threshold mechanisms and bandwidth reservation mechanisms. The proposed methods, that base on the concept of effective availability, make it possible to determine the blocking probability in networks with the point–group and point–point selection. A recursive method for a determination of the point–group and point–point blocking probability in switching networks servicing multi-service BPP traffic streams is subsequently proposed. The method guarantees a considerable simplification of the modelling process in multi-stage switching networks.
The effectiveness of the proposed methods for modelling multi-rate systems with BPP traffic has been verified by simulation methods. The conducted research study clearly indicates high accuracy of the results of the calculations obtained for all systems with multi-rate BPP traffic under scrutiny.
Authors: Maciej Stasiak, Mariusz Głąbowski, Sławomir Hanczewski and Piotr Zwierzykowski
Title: Podstawy inżynierii ruchu i wymiarowania sieci teleinformatycznych (An introduction to traffic engineering and dimensioning of telecommunications networks)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 2009
ISBN: 9788371433184
The textbook is the first educational material of its kind in Poland providing extensive insight into traffic engineering and network dimensioning. After a general introduction, consecutive chapters discuss the following issues: basics of traffic theory, the most important occupancy distributions of groups in systems with single-service traffic, modelling of systems with traffic overflow, the most widely used analytical models of switching networks, the concept of the model of effective availability, modeling of groups in systems with multirate traffic, methods for dimensioning of groups in broadband networks and models of transmission nodes in packet networks.
Authors: Maciej Stasiak, Mariusz Głąbowski and Piotr Zwierzykowski
Title: Modelowanie i wymiarowanie ruchomych sieci bezprzewodowych (Modelling and dimensioning of wireless mobile networks)
Publisher: Wydawnictwa Komunikacji i Łączności
Year of publication: 2009
ISBN: 9788320617221
This book is the first study In Poland to offer a comprehensive analysis of traffic engineering and dimensioning of wireless networks. The book discusses both basic issues, i.e., an introduction to traffic theory or single-rate (channel) systems with traffic overflow, and more advanced issues, such as models of systems with multi-rate traffic and queueing models. In addition, the book includes algorithms that provide solutions to practical dimensioning and optimization of selected interfaces in 2/3 G mobile networks.
Authors: Wojciech Kabaciński, Mariusz Żal
Title: Sieci telekomunikacyjne (Telecommunications networks)
Publisher: Wydawnictwa Komunikacji i Łączności
Year of publication: 2008
ISBN: 9788320617160
This book presents telecommunications networks of different types, from the historical, though still in operation, telephone network to state-of-the art packet networks (such as the internet) or optical networks. The textbook intends to provide a deeper understanding of basic principles that underlie the operation of telecommunications networks. Bearing in mind that it is not possible to include an overview of all networks and issues in just one publication, a number of multicast networks and the issues of traffic theory have been omitted in the textbook. The description of the basic operation of telecommunications networks of different type included in the textbook is to facilitate further understanding and study of the presented types of networks.
Authors: Grzegorz Danilewicz, Wojciech Kabaciński
Title: System sygnalizacji nr 7. Protokoły, standaryzacja, zastosowanie (Signalling system No. 7. Protocols, standardization and application)
Publisher: Wydawnictwa Komunikacji i Łączności
Year of publication: 2005
ISBN: 8320615976
The book provides a description of the set of telephony signalling protocols (Common Channel Signaling System 7) that are used to set up most of the world's public switched telephone network calls in common-channel signaling in digital communication. The protocols include a set of protocols enabling the exchange of controlling information in telecommunications networks. The book explains the functionality, structure and the set of signalling protocols of the CCSS 7, the rules for building and planning signalling networks, implementation of the system in fixed, ISDN and mobile telephony, the use of signaling in intelligent networks B-ISDN broadband networks, the development of signaling for its future use in next generation networks. Additionally, issues of broadly understood network management are also considered in the book.
Author: Wojciech Kabaciński
Title: Nonblocking Electronic and Photonic Switching Fabrics
Publisher: Springer
Year of publication: 2005
ISBN: 9780387265308
This state-of-the-art survey of switching fabric architectures gives special attention to combinatorial properties of switching fabrics – nonblockingness and rearrangeability. Also describing control algorithms proposed to control different architectures, it provides an overview of recent advances in combinatorial properties of switching fabrics, including many new results applicable to nonblocking operation of different switching fabric architectures mostly for multicast connections and multirate connections. It contains a considerable amount of published results, but organized into a coherent volume.
Author: Maciej Stasiak
Title: Efektywna dostępność w zagadnieniach modelowania pól komutacyjnych (Effective availability in modelling switching networks)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 2005
ISBN: 8371433611
The book discusses the fundamentals of traffic theory, i.e., models of call streams and service processes in telecommunications systems and groups, issues of modelling groups in multi-rate (integrated) traffic systems, as well as two most widely used analytical models of switching networks. The concept of the effective availability is presented followed by a presentation of a comparative analysis of the most important models of switching networks developed on the basis of the concept, such as the CIRB, CLIGS-A, CLIGS-B, PPL, PPLM, MRS and MB methods. Modelling of multi-service switching networks servicing multi-rate traffic in nodes of narrowband and broadband telecommunications networks is discussed, along with the concept of the equivalent network. The family of models within such an approach is presented, including the basic models such as PGBMT, PPBMT and PPD, models of networks with bitrate reservation in output and inter-stage links as well as models of switching networks with multicast switching .
Author: Wojciech Kabaciński
Title: Standaryzacja w sieciach ISDN (International standardization of ISDN)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 2001
ISBN: 9788371434820
Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. The book discusses the requirements and the rules of operation of digital networks with integrated services (ISDN). Feasible configurations of networks of this type, services available for users and the signalling issues in both subscriber access and in circuit-switched telephone network access are described and discussed. Additionally, end user’s devices, including multimedia devices, for ISDN networks, are discussed. This particular edition of the book has been revised and includes the author’s long-term experience in educational work with students of telecommunications and computer science and in training sessions on ISDN networks for staff members of operators of telecommunications networks. The information contained in the book can be also useful for non-professionals in telecommunications who are interested in using ISDN services in telecommunications networks.
Authors: Janusz Kleban, Mariusz Żal
Title: Techniki integracji usług (Service Integration Techniques)
Publisher: Instytut Elektroniki i Telekomunikacji, Politechnika Poznańska
Year of publication: 2000
The script entitled Service Integration Techniques has been written for 2nd-year students of Telecommunications majoring in IT and ICT Integration.
The authors' goal was to compile the material concerning the integration of telecommunication and packet networks.
The opening chapters describe the Open System Interconnection (OSI) model, reflecting the communication functions of data-exchange systems. The script also presents network devices used for the interconnection of networks, i.e., hubs, bridges, switches and routers. Much space was devoted to IP and IP-based integration. This part discusses internal and external routing protocols, issues connected with IP packet transfer through PPP, and TCP and UDP packet transfer through IPX. The following chapters focus on IP packet transmission through FDDI, X.25 and ISDN.
Attention was also given to the problems of Windows NT and Novell NetWare integration. The final chapters of the script describe the ways in which LANs can cooperate with ATM networks, as well as network solutions involving optical IP networks and HFC networks that may be used by cable TV operators to provide broadband services to home users.
Authors: Maciej Stasiak, Piotr Zwierzykowski
Title: Usługi w sieciach teleinformatycznych (Services in ICT Networks)
Publisher: Instytut Elektroniki i Telekomunikacji, Politechnika Poznańska
Year of publication: 1999
The script entitled Services in ICT Networks has been written for 2nd-year students of Telecommunications majoring in IT and ICT Integration. The authors’ goal was to compile and to present in a simple and logical manner the information about services in telephony-derived networks and packet networks. The intermingling of ICT and IT has also found its reflection in the field of services. Therefore, the division of services presented in the script is conventional, based on the existing standards in the area of service classification. The material has been organised into seven parts.
Author: Wojciech Kabaciński
Title: Wybrane problemy konstrukcji szerokopasmowych pól komutacyjnych (Selected problems of the construction of broadband switching networks)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 1999
ISSN: 05516528
The work deals with switching networks in broadband switching systems. Nonblocking conditions in two-sided switching networks and one-sided switching networks composed of triangular switches are considered. Strict-sense nonblocking conditions in digital switching networks with multi-slot connections are formulated and proved. Wide-sense nonblocking conditions for networks with such connections are also given. Wide-sense and strict-sense nonblocking for broadband ATM switching networks are also formulated and proved. Resultants obtained in this work have been compared with sufficient conditions known earlier form the literature.
Space-division switching networks in optical systems are also considered in this work. The switching network architecture is also proposed. This architecture enables to expand a switching network capacity without changing of earlier existing connections. Optical switching networks of a mixed architecture composed of optical splitters and directional couplers are proposed. Characteristics of the proposed architecture are derived. The proposed expandable architecture of switching networks is used also for expanding capacity of the mixed architecture.
Author: Maciej Stasiak
Title: Systemy ze stratami w sieciach z ruchem zintegrowanym (Loss systems in the networks with multi-rate traffic)
Publisher: Wydawnictwo Politechniki Poznańskiej
Year of publication: 1995
ISSN: 05516528
This work proposes a number of analytical methods for calculations of traffic characteristics of systems with losses in multiservice digital networks. The methods involve groups and switching networks carrying multiservice (integrated) traffic.
A combinatorial analysis of different types of groups with multi-channel traffic (full-availability group, EIG and non-full-availability group) is also carried out in the work. This analysis provides a basis for the derivation of the analytical methods presented in the work for calculations of the blocking probability and other probabilistic characteristics of the involved groups.
The work presents a number of approximate methods for calculations of the blocking probability in multi-stage switching networks with multirate traffic and the point-to-point selection, point-to-group selection, and point-to-group selection with a number of attempts to set up a connection. The proposed methods take into account centered and distributed methods for control of setting up connection paths in the network. The basic element in the considered methods is a model of the output group of the switching network and the notion of effective availability. Output groups are approximated by models of non-full-availability groups and Erlang’s Ideal Gradings with multirate traffic. The work defines and identifies the methods for calculations of all components of the effective availability for call streams of different classes.
The results of the analytical calculations for groups and switching networks with multirate traffic presented in the work are also compared with the data provided in the study by digital simulations. For this purpose, on the basis of the coerced Markov chains method, appropriate simulation models of systems with losses and multirate traffic have been developed. These models make it also possible to examine the influence of different connection path selection algorithms upon the traffic carrying capaFcity of the considered switching systems.
The dependences introduced in this work can be applicable in the analysis and designing of switching systems and nodes operating in ISDN and BISDN networks.