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International Symposium on communication Systems, networks and Digital Signal Processing, CNSDSP

作者： Adam Kaliszan Slawomir Hanczewski Mariusz Glabowski Maciej Stasiak Piotr Zwierzykowski Chair of Communication and Computer Networks Poznan University of Technology Poznan Poland

The article is devoted to an implementation of the Control Plane module (responsible for the routing) for the nodes of Parallel Internet IPv6 QoS network. The mentioned network is one out of three IIP System networks, built within the Future Internet Engineering project. A characteristic feature of the PI IPv6 QoS network is to provide an appropriate quality of services. This functionality is dependent on the routing as well. Therefore, the CP module must meet the numerous criteria. A way of applying the Control Plane module for the nodes of PI IPv6 QoS network, proposed by the authors of this article, has been implemented, tested and integrated with this network. The conducted tests have proved a correctness of the named assumptions.

关键词： Protocols Decision support systems TV

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The Control Algorithm and the FPGA Controller for Non-interruptive Rearrangeable Log2(N,0,p) Switching networks

The Control Algorithm and the FPGA Controller for Non-interr...

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IEEE International Conference on communications

作者： Wojciech Kabacinski Marek Michalski Poznan University of Technology Chair of Communication and Computer Networks Poznan Poland

This paper presents the control algorithm for non-interruptive rearrangements in Log2(N,0,p) switching networks. The proposed algorithm is able to find a plane for any new connection in the rearrangeable switching network with no more than three rearrangements. Moreover, these rearrangements can be realized in the switching network without interrupting transmission for existing connections. Rearrangements are done by setting up a new connecting path before the old connecting path for the rearranged connection is disconnected. We also describe the FPGA implementation of this algorithm for the Log2(N,0,p) switching network. This FPGA controller has been tested and verified.

关键词： Tin Joining processes Field programmable gate arrays Color Optical switches Hardware

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Convolution algorithm for overflow calculation in integrated services networks

Convolution algorithm for overflow calculation in integrated...

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Asia-Pacific Conference on communications

作者： Mariusz Glabowski Adam Kaliszan Chair of Communication and Computer Networks Poznan University of Technology Poznan Poland

The present article proposes a new method for modelling multi-service packet networks with implemented traffic overflow mechanisms. The basis for the proposed method is a special convolution algorithm that enables to determine the occupancy distribution and the blocking probability in network systems in which packet streams (calls) of individual traffic classes can be serviced by both direct and alternative resources. The algorithm worked out by the authors makes it possible to model systems with any type of traffic offered to direct groups. The methods that are to be found and are described in the literature of the subject permit the researcher to model systems in which direct groups are offered either Erlang or Engset streams.

关键词： Convolution Analytical models Mathematical model Equations Probability Accuracy IP networks

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FPGA controller for rearrangeable Log2(N, 0, p) fabrics with an even number of stages

FPGA controller for rearrangeable Log2(N, 0, p) fabrics with...

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IEEE Workshop on High Performance Switching and Routing

作者： Wojciech Kabaciński Marek Michalski Chair of Communication and Computer Networks Poznan University of Technology Poznan Poland

In this paper we present rearrangeable log 2 (N, 0, p) switching fabrics and the control algorithm for the case of an even number of stages. The main topic of this paper is the implementation of a hardware controller for such fabrics. The algorithm is described in VHDL code and realized in ML505 - the demo board for Virtex 5 - FGPA chip from the Xilinx Company. The implementation presented here works very fast, the controller can send out the set of actual signals just 20 nanoseconds after the request has been made.

关键词： Switches Field programmable gate arrays

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Modelling of the LTE radio interface for NRT traffic

Modelling of the LTE radio interface for NRT traffic

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networks International Telecommunications Network Strategy and Planning Symposium

作者： Sławomir Hanczewski Maciej Stasiak Piotr Zwierzykowski Chair of Communication and Computer Networks Poznan University of Technology Poznan Poland

In modern cellular networks the provision of higher priorities to Quality of Service (QoS) sensitive applications is the important task for cellular networks vendors and operators. In order to satisfy these requirements it is necessary to implement QoS mechanisms in the software and hardware used in multiservice cellular networks. QoS mechanisms in the LTE network can be implemented, for example, in the radio interface. In the article, a new analytical model for a determination of traffic characteristics of RT and NRT traffic streams serviced in the LTE radio interface is proposed. The model has been validated by a number of simulation experiments carried out by the authors. The conducted experiments have confirmed that the proposed analytical model can be used for engineering calculations.

关键词： Long Term Evolution Bit rate Quality of service Resource management Servers Analytical models Queueing analysis

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Modeling of Systems with Overflow Multi-Rate Traffic

Modeling of Systems with Overflow Multi-Rate Traffic

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Advanced International Conference on Telecommunications (AICT)

作者： Mariusz Glabowski Katarzyna Kubasik Maciej Stasiak Chair of Communication and Computer Networks Poznań University of Technology Poznan Poland

The article proposes an analytical method for determining traffic characteristics of systems which are offered overflow traffic composed of multi-rate traffic streams. Additionally, a method for determining parameters of the traffic overflowing from primary groups and an approximate method for dimensioning systems servicing multi-service switching networks with overflow traffic are also presented.

关键词： Traffic control Telecommunication traffic Bandwidth computer networks Exponential distribution Differential equations Poisson equations Telecommunication switching Telecommunication congestion control Telephony

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Modelling of the WCDMA Interface in the UMTS Network with Soft Handoff Mechanism

Modelling of the WCDMA Interface in the UMTS Network with So...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Maciej Stasiak Piotr Zwierzykowski Damian Parniewicz Chair of Communication and Computer Networks Poznan University of Technology Poznan Poland

The paper proposes an analytical approach to blocking probability calculation in the UMTS network carrying a mixture of multi-rate traffic, under the assumption that the part of resources of the interface is dedicated for servicing handoff traffic. In the proposed method, handoff connections are modeled on the basis of the fixed point methodology and dynamic reservation. The results of analytical calculation of the blocking probability in the group of cells carrying a mixture of different multi-rate traffic streams are compared with the results of the simulation experiments, which confirms a rather high accuracy of the method. The described calculation scheme is applicable for cost-effective resource management in 3G mobile networks and can be easily applied to network capacity calculations.

关键词： Multiaccess communication 3G mobile communication Traffic control Base stations Analytical models Telecommunication traffic Probability Packet switching communications technology Paper technology

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Modeling of Video on Demand Systems

Communications in Computer and Information Science

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communications in computer and Information Science 2014年 431卷 233-242页

作者： Hanczewski, Slawomir Stasiak, Maciej Poznan University of Technology Chair of Communication and Computer Networks Polanka 3 60-965 Poznan Poland

ISBN: (纸本)9783319079400

This paper presents a new, approximate method for modelling Video on Demand (VoD) systems. The proposed method is based on the multi-service model of Erlang's Ideal Grading (EIG). A comparison of the results obtained by the method with the results of a digital simulation has confirmed fair accuracy of all adopted theoretical assumptions. The method can be used to analyse, optimize and design VoD systems. © Springer International Publishing Switzerland 2014.

关键词： Grading

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Demo: The acoowee-framework

Demo: The acoowee-framework

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International Conference on Distributed Computing in Sensor Systems (DCOSS)

作者： Gerhard Fuchs Lorenz Büttner Christoph Damm Mirko Hansen Florian Heisig Tim Seyschab Reinhard German Computer Science Chair for Computer Networks and Communication Systems Universität Erlangen Nürnberg Erlangen Germany

Within the framework of the acoowee-project we want to improve the programming of Wireless Sensor networks (WSNs) by using and adapting the expressiveness of UML2 Activity Diagrams (UADs) to specify the behavior of the WSN. We expect that our proposal can simplify the way of programming the functional behavior of a WSN and so bring the programming closer to domain experts. We develop the acoowee-framework for Sun SPOTs (spots). The user of the acoowee-framework visually programs UADs and saves them. Afterwards, these UADs are converted into scripts and deployed to the spots e.g. over the air. Finally, the interpreter that runs on the spots executes the scripts. In this demo we present the usage of the acoowee-framework by means of a network consisting of 5 spots and a host with a connected base station. We present all steps listed above. Additionally, we show a rule based manipulation of already deployed scripts and give the attendees the possibilities to try this kind of programming by themselves.

关键词： Wireless sensor networks Programming Unified modeling language Sun Runtime Tin Proposals

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Identification of Delay Thresholds Representing the Perceived Quality of Enterprise Applications

Identification of Delay Thresholds Representing the Perceive...

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International Workshop on Quality of Multimedia Experience, QoMEx

作者： Kathrin Borchert Stanislav Lange Thomas Zinner Matthias Hirth Chair of Communication Networks Am Hubland Institute of Computer Science Würzburg Germany

Modern enterprise applications are often designed as distributed architectures, e.g., thin client computing and thus degradations in network related Quality of Service (QoS) parameters may also negatively impact the user-perceived Quality of Experience (QoE) of the application. In this work, we create a model to predict the perceived application quality based on measurements of objective technical parameters. For this, we gathered a data set in a cooperating enterprise over a timespan of nearly three months. As the obtained data set is subject to bias that originates from seasonal effects as well as a limited and predefined set of technical parameters, we further evaluate how to identify segments of the data that lead to misclassification. Last, we quantify the trade-off between the gain in the QoE prediction accuracy and the amount of filtered data.

关键词： Quality of experience Monitoring Tools Quality of service Delays Companies

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