Upozorenje
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| CTI Opening
Chairs: Stjepan Golubić et all. |
| CTI-8 Business Environment
Chair: Mislav Hebel, T-Croatian Telecom, Zagreb |
S. Hadzovic (Regulatorna agencija za komunikacije, Sarajevo, Bosnia and Herzegovina), N. Behlilović (Elektrotehnički fakultet u Sarajevu, Sarajevo, Bosnia and Herzegovina)
Aktuelni razvoj FTTC/VDSL i FTTH mreža sa aspekta državnih regulatora za komunikacije 
Sažetak — Nadolazeće širenje optički baziranih NGN mreža zahtjeva i brojne izmjene odnosa između sudionika obuhvaćenih tim procesom. Stoga se, unutar evropskog geografskog prostora, nameće potreba za izgradnjom zajedničkog pristupa, pri izradi novih strategije državnih regulatornih agencija za komunikacije. Pošto se neumitne promjene odnosa reflektuju u različitim segmentima komunikacione mreže, kako u fazi njene izgradnje, tako i u fazi njene eksploatacije, u radu se posebno elaboriraju refleksije, nastupajućih promjena u domenu korisničkih zahtjeva i mogućnosti, zatim u domenu pristupnih mreža, te u domenu jezgro mreže na koncept rada državnih regulatora za komunikacije.
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G. Ćuković Trapara (Regulatorna agencija za komunikacije, Sarajevo, Bosnia and Herzegovina)
Regulatorni okvir za implementaciju UMTS sistema u GSM opsegu
Mobilni GSM 900/1800 sistem implementiran u zadnjoj deceniji kao druga generacija mobilnih sistema nastavit će da egzistira zajedno sa trećom generacijom mobilnih sistema. Za UMTS sistem uvršten u familiju IMT-2000, treću generaciju mobilnih sistema, namijenjen je frekvencijski opseg 2 GHz kao osnovni opseg za implementaciju ovog sistema. U skladu sa WAPECS (Wireless Access Policy for Electronic Communications Systems) regulatornim okvirom, za IMT sisteme moguće je koristiti i radio frekvencijske opsege namijenjene za drugu generaciju mobilnih sistema (GSM 900/1800) što treba da doprinese racionalnijem korištenju frekvencijskog spektra, boljoj pokrivenosti, posebno u ruralnim oblastima, kao i mogućnosti pružanja novih multimedijalnih servisa.
Zbog gore navedenog potrebno je stvoriti ragulatorni okvir u kojem bi se omogućila implementacija UMTS sistema u GSM opsezima. U ovom radu dat je prijedlog korištenja opsega 900/1800 MHz od strane GSM operatora za UMTS sistem, migraciju druge generacije u treću generaciju mobilnih sistema i mogućnost njihovog zajedničkog rada. Zadatak regulatora je da u skladu sa planom namjene i korištenja radio frekvencijskog spektra osigura nesmetan rad ova dva sistema u istom frekvencijskom opsegu uz odredjena ograničenja za izbjegavanje štetnih smetnji.
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D. Markulin (HT-Hrvatske telekomunikacije d.d., Zagreb, Croatia), M. Kunštić (Faculty of Electrical Engineering and Computing in Zagreb, Zagreb, Croatia)
Formal modelling business management of public telecommunication network
This paper presents one of the possible ways of a formal modelling business management of the public telecommunication network. Like a tool which could be used in design of business management model has to present business processes precisely and unambiguously. Model has to contain all elements which are needed to describe system business support and its role in business management. Formal methods which will be examined in modelling are diagram-based methods (UML, SDL, Petri Nets). Formal model has to simulate business processes, data flow through the systems which are part of network management and data flow to network elements which are configured. Model has to define needed data for employees who are participants in business process too. Final, if none of formal methods gives satisfying results it is needed to define in which direction research has to go to get an adequate formal model.
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C. Krušlin (Hrvatska agencija za poštu i elektroničke komunikacije, Zagreb, Croatia)
Business Excellence in Non-profit Company
The success in achieving positive business results and employees satisfaction, which means overall company satisfaction, success and recognition on market, depends a lot on the quality of integrated business processes, their well estimated optimization and implemented measures for tracking and monitoring the processes. For this reason companies need much more time to dedicate not only to carry out routine jobs and procedures but also to analyze ways of performing them within the company and to note down each step in the jobs execution procedures, i.e. to record business processes, as the first step. The second step would be to analyze recorded processes and to optimize them as much as possible to become more efficient, to dissipate less time and give more satisfaction to employees. And the third step would be to introduce and establish the system for tracking and monitoring optimized processes, and to evaluate the results.
This article gives an overview of procedure for introducing the process management, integrated with/within information system in the non-profit company.
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I. Žaja (T-HT d.d., Zagreb, Croatia), M. Šišul, A. Bublić (T-HT, Zagreb, Croatia)
Optimizacija troškova poslovanja uvođenjem odgovarajućih IT rješenja
Sažetak – U vremenima koja su nam donijela krizu na globalnom i domaćem tržištu, kada smo postali svjedoci gotovo svakodnevnog stačaja kako privatnih tako i državnih tvrtki, više nego ikada nameće se pitanja kako uštedjeti. Ušteda ne znači nužno stopiranje uvođena novih tehnologija, ona se naprotiv u IT svijetu pokazala značajna kroz mogućnosti optimizacija koje pružaju same tehnologije. Telekom operatori u borbi za svoj dio tržišta svakodnevno razvijaju nove pakete različitih tehnološko – marketinških rješenja. Zajednički cilj je u konačnici imati zadovoljnog korisnika te zadržati,a po mogućnosti i povećati svoje prihode. Krajnim korisnicima međutim u vremenima krize modernizacija obično nije prioritet. Posebice ako osim poboljšanja funkcionalnosti ne donosi mogućnosti optimizacije u smislu uštede. Analizirajući potrebe i mogućnosti korisnika kroz projekcije očekivanih prihoda, operatori mahom predviđaju njegov pad. Potencijal se nalazi u migraciji tradicionalnih usluga na IP platformu, jeftiniju za održavanje samim operatorima, a time i povoljniju za ponudu prema krajnjim korisnicima, kao i u zajedničkim – partnerskim rješenjima operatora i drugih tvrtki iz IT svijeta koje će u zajedničkom nastupu prema korisniku omogućiti cjelovitu ponudu rješenja prihvatljivijih krajnjem korisniku.
Model poslovanja koji je HT prepoznao kao veoma atraktivan prema svojim krajnjim korisnicima je ponuda cjelovitih ICT rješenja. Ona se sastoje od dijela koji HT pruža samostalno i dijela za čiju realizaciju i koordinaciju surađuje sa svojim partnerima.
Drugo od niza rješenja koje Hrvatski telekom nudi svojim korisnicima, a koje se u svijetu pokazao uspješnim je omogućavanje svojim djelatnicima stalni ili povremeni rad od kuće. Tehničko rješenje koje omogućava potpunu funkcionalnost ureda u okruženju doma sastoji se od kombinacije korištenja podatkovnog prijenosa, telefoniranja te korištenja fax-a, na jednak način kao da se djelatnik nalazi u uredu.
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Ž. Mihoković, A. Carić, E. Jurić, I. Savić (Hrvatska agencija za poštu i elektroničke komunikacije, Zagreb, Croatia)
Application Program for Collecting and Analysing Electronic Communications Market in the Republic of Croatia
Liberalizacija hrvatskog tržišta elektroničkih komunikacija kao i posljedična harmonizacija s tržištem Europske unije je pred nacionalnog regulatora, HAKOM, postavila niz zadataka. Jedan od tih zadataka je promatranje tržišta u kvalitativnom i kvantitativnom pogledu kao podloga za donošenje adekvatnih odluka odnosno kao pretpostavka dobre liberalizacije i kvalitetne regulacije. Stoga je i obim podataka i pokazatelja koji se neprekidno prikupljaju i analiziraju u direktnom ili povezanom odnosu, postao toliko velik da je njegova automatizacija neophodna. U radu je dan prikaz sustavne analize, realizacije i prvih iskustava sustava podataka i pokazatelja.
Application program for collecting and analysing electronic communications market in the Republic of Croatia
Liberalisation of the Croatian electronic communications market and harmonisation with the market of the European Union has set an array of tasks before HAKOM as the national regulator. One of those tasks is quantitative and qualitative monitoring of the market as the basis for making relevant regulatory decisions that would contribute to the market liberalization and effective regulation. Consequently, the volume of data and indicators that are continually collected and analysed has significantly increased so the using of special application became necessary. The paper explains the method of the analysis, implementation process and first experiences in using the program.
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K. Kous (University of Maribor, Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia)
Comparative analysis of BPMN versions and its support with Workflow patterns
In this paper we will present the notation for modeling business processes called Bussines Process Modeling Notation (BPMN). Differences between the versions of notation (BPMN 1.0, BPMN 1.1, BPMN 1.2, and BPMN 2.0) will be briefly described. BPMN is used for the introduction of the business processes, which represents the starting point for the informatization of the unsupported work processes or optimization of existing work processes in organization. After description of the BPMN, the presentation of Workflow patterns will follow. Our research will be based on comparative analysis of elements of BPMN with Workflow patterns performance support. In the results of analysis comparison of BPMN versions will be included, also the review of Workflow patterns, which can be modeled with BPMN, will be conducted and illustration of the elements of BPMN, which can be supported by Workflow patterns, will be made.
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D. Robić (ERICSSON NIKOLA TESLA d.d., ZAGREB, Croatia)
Workflow testing
Workflow management systems become very popular in developing enterprise systems today. Workflow activities does not include only interaction with the human user but they also include interaction with other software applications and systems which functionalities are included in business process. As more and more workflow become important part of business applications, testing these workflows become increasingly important. However, supporting tools for workflow testing is very poor. This work addresses the problem of workflow testing and describes testing methods used on FileNet PE as workflow engine proving that testing in early phase of development is less expensive than later.
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| CTI-10 Infrastructure for New Services
Chair: Vlasta Hudek, T-Croatian Telecom, Zagreb |
I. Gagro (ERICSSON NIKOLA TESLA, ZAGREB, Croatia), R. Cavor (Ericsson Nikola Tesla d.d., Zagreb, Croatia)
SBC Implementation in Next Generation Networks (NGN)
Today's competitive enviroment, together with huge developement of IP networks used for delivering high-bandwidth services, forced telecom operators to simplify network topology, reduce operating costs, and have secure, high quality convergent network which can be easily managed and adopted according to future requirements. As a logical step with IP network developement was introduction of Voice over IP. For green-field operators it was an easy way to get in the business quickly with deployment of IMS based network, but for old telecom operators migration started with adaptation of old TDM based network used for old customers to new, IP network, together with deployment of IMS network.
One important, and we could almost say critical element of every VoIP network is Session Border Controler (SBC). In this article we will give a brief overview of major SBC functionalities and the way of implementation in next-generation networks (NGN).
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M. Skomeršić, N. Petrlik, N. Đurak (ISKON INTERNET d.d., Zagreb, Croatia)
Physical Layer End-to-End Availability in Next Generation Network
In this paper the end-to-end physical layer availability in NGN (Next Generation Networks) will be analyzed. The case study will be presented and physical layer availability for this case will be calculated. All typical NGN architecture entities are considered in availability calculation, such as core network availability, access network, softswitch, edge routers, etc. The influence on ETE (end-to-end) availability of some network elements will be discussed.
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S. Gavrilović (Ericsson Nikola Tesla d.d., Zagreb, Croatia)
Standards Based Solutions for Voice and SMS Services over LTE
LTE (Long Term Evolution) is the last step towards the 4th generation (4G) of radio technologies, designed to increase the capacity and speed of mobile telephone networks. Commercial LTE networks are scheduled to offer services to consumers in 2010. Most of today’s mobile voice network (2G/3G) is based on circuit switched technology. In LTE, the circuit connection has been dropped and the connection to the handset is purely packet. Thus, there is no native circuit voice or SMS capability built into LTE and operators must develop some type of overlay technology to provide voice calling.
This paper discusses different technologies for Voice over LTE, comparing the requirements and benefits for the operator as well as for the end-user. The Circuit Switched (CS) fallback functionality is used as an example of standardized solution for telephony, emergency calls and SMS. The main benefit from CS fallback is that it enables LTE roll-out including telephony without IMS deployment, while at the same time being a possible intermediate step before introducing IMS & MMTel.
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D. Markulin (HT-Hrvatske telekomunikacije d.d., Zagreb, Croatia), K. Musa (HT d.d., Zagreb, Croatia)
Proposal for Specification of Complex Processes for Telecommunication Service Provisioning in Existing IT Environment
Today, telecommunication services are becoming more and more complex and service management and support over information systems are becoming necessity. Implementation of complex orders with two or more work orders with coordination between them (manually or automatically) may cause long implementation time or(and) uncoordinated technician work at customer site. Consequence is dissatisfied customer. To avoid this business processes have to be optimal and answer on customer demand has to be quick and effective. Flexible and optimal complex process has to follow real realization in network. It can be possible with only one order which include all services for one customer or with better coordination and managing of simple orders which are used for complex services provisioning. The goal of this article is to propose specification that can model complex services provisioning without regard to IT architecture and kind of IT implementation.
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Z. Buljubasic (BH Telecom d.d.Sarajevo, Tuzla, Bosnia and Herzegovina), H. Šabanović (BH Telecoma, Sarajevo, Bosnia and Herzegovina), J. Mulabegović (BH Telecoma, Tuzla, Bosnia and Herzegovina)
Podrška korisnicima telekomunikacijskih usluga temeljena na truoble ticket sustavu
Sažetak - Cilj ovog rada je predstaviti najvažnije specifičnosti dinamičnog i zahtjevnog telekomunikacijskog tržišta u kontekstu ispunjavanja korisničkih zahtjeva za podrškom pri korištenju telekomunikacijskih usluga. Kroz ovaj cilj će se prikazati mogući informacijski model/rješenje za kvalitetno i brzo ispunjavanje korisničkih zahtjeva za podrškom pri pružanju telekomunikacijskih usluga pri čemu takav model nastoji ispuniti većinu korisničkih očekivanja.
Ključne riječi:
Trouble ticket, TTS-Trouble Ticket System, TEM, zahtjev za podrškom, korisnici telekomunikacijskih usluga, CRM (Customer Relationship Management).
Abstract - The aim of this paper is to present the most important particularities of demanding dynamic telecommunications market in the context of fulfilling user requests for support in the use of telecommunications services. The research goal is to investigate and to present the information model based on trouble ticket system for quality and quick fulfillment of user requests for support in the provision of telecommunications services with such a model seeks to meet customer expectations.
Key words:
Trouble ticket, TTS-Trouble Ticket System, TEM, customer support, users of telecommunication services, CRM (Customer Relationship Management).
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Ž. Hocenski (Elektrotehnički fakultet Sveučilišta u Osijeku, Osijek, Croatia), K. Popović (Siemens IT Solutions, Osijek, Croatia)
Cloud computing security issues and challenges
In the last few years, cloud computing has grown from being a promising business concept to one of the fastest growing segments of the IT industry. Now, recession-hit companies are increasingly realising that simply by tapping into the cloud they can gain fast access to best-of-breed business applications or drastically boost their infrastructure resources, all at negligible cost. But as more and more information on individuals and companies is placed in the cloud, concerns are beginning to grow about just how safe an environment it is. This paper discusses security issues, requirements and challenges that software engineers face during production environment engineering. Recommended practices to address these are suggested for system designers, architects, developers and testers.
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| CTI-4 Networks Interworking
Chair: Darko Markulin, T-Croatian Telecom, Zagreb |
V. Divkovic (Ericsson Nikola Tesla d.d., Zagreb, Croatia), T. Dumic (Ericsson Nikola Tesla, Zagreb, Croatia), A. Bazant (Fakultet elektrotehnike i racunarstva, Zagreb, Croatia)
Point-to-multipoint extensions for “Toolbox for Traffic Engineering Methods” (TOTEM)
Point-to-multipoint (P2MP) labeled switched paths (LSPs) are used for services such as video broadcast (IPTV), IP and Ethernet VPNs. Benefits of deploying P2MP LSPs are reduced bandwidth usage, improved performance and enhanced scalability. TOTEM (Toolbox for Traffic Engineering Methods) is an open source Traffic Engineering (TE) toolbox containing tools and algorithms for optimizing IP and (G)MPLS networks. In this work we have extended TOTEM to support constrained P2MP LSPs' setup. With these extensions TOTEM can be used as a basis for implementing and comparing different optimization algorithms for establishing and protecting P2MP LSPs in MPLS based networks.
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D. Oužecki (Ericsson Nikola Tesla d.d., Zagreb, Croatia), D. Jevtić (Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia)
Reinforcement Learning as Adaptive Network Routing of Mobile Agents
In large, distributed systems, such as ad-hoc networks, centralized learning of routing or movement policies may be impractical. We need to employ learning algorithms that can learn independently, without the need for extensive coordination. A search for alternative methods of routing packets has resulted in reinforcement learning (RL) as a good approach to adaptive routing. RL methods are able to learn and adapt to a unknown and changing environment. Using only a simple coordination signals such as a global reward value, we show that RL methods can be used to control routing of mobile agents. RL method was used to regulate the transfer of mobile agent from the network input, throught the routing nodes, towards the service provessing node. A distributed Q-Learning framework, based on RL, embeds a learning policy at every node to adapt itself to the changing network conditions, which leads to a synchronized routing information, in order to achive a shortest delivery and service proccesing time of mobile agents.
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M. Capan (Etna d.o.o., Zagreb, Croatia)
Self-organizing software agents for communication management in mobile ad-hoc networks
Mobile Ad-hoc networks (MANETs) allow wireless connectivity of mobile devices without any network infrastructure. MANETs are used for connecting variable number of nodes that occupy confined area so that network topology and communication conditions vary. Very large MANETs do not scale well, because of large network traffic overhead caused by establishing links between nodes.
There are several routing protocols used in ad-hoc networks, like AODV (Ad-hoc On Demand Distance Vector) protocol. AODV is an “on demand” routing protocol that reduces network overhead but also introduces a small delay. Messages sent between communication nodes by using AODV protocol generate the majority of network traffic and in large networks have a serious impact on performance.
In this paper, an upgrade of AODV protocol is proposed in the sense that communication is possible on several levels (radio ranges). In this approach, network nodes monitor network traffic and topology in order to build higher level of network used as a bridge to distant nodes. For implementation purpose, self-organized software agent mechanisms are applied: stigmergy and digital pheromone that should increase robustness, flexibility and scalability of mobile ad-hoc network.
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M. Dujak (ERICSSON NIKOLA TESLA d.d., ICT RJEŠENJA, ZAGREB, Croatia), R. Filjar (Ericsson Nikola Tesla d.d., Zagreb, Croatia), M. Forko (Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia)
USER-TAILORED DISSEMINATION OF ROAD TRAFFIC INFORMATION
Situation awareness is essential issue in both personal road navigation, and traffic management. The Intelligent Transport Systems have been introduced as a general solution for modern road transport management. Based in essence on the Information and Communications Technologies (ICT), the ITS collects the information on road traffic status from various sources, creating a general situation awareness in near-real time. The situation awareness created within the ITS is exploited for various information and traffic management services. ITS-based situation awareness is expressed in a form of a geospatial database of near-real time road segment transport status estimates. Depending on the quality of road segment traffic status estimates, the ITS can offer a group of information services, such as graphical representation of road segment traffic situation, alert provision on road incidents (gridlocks, car accidents, roadworks), driver guidance etc.
Diversity of end-user platforms makes the task of traffic information dissemination very challenging. Here we present a client-server solution for traffic information data dissemination, using the Google Maps development environment, combined with road traffic estimates for enduser's local area available from related database within ITS. Solution is platform independent due to to its development based on Java framework. Presented solution is verified as both desktop and smart-phone applications
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N. Ukić, I. Markota, I. Ćubić (Ericsson Nikola Tesla d.d., Zagreb, Croatia)
Network-Aware Java Applications Based on JSR-307 Specification
Modern smart phone devices are small computers with operating system, third party applications and several wireless interfaces. Their mobility goes beyond traditional networked devices; as device move, it is able to see different access networks and use different physical interfaces to establish the connection. This enhanced mobility requires some sort of connectivity and network mobility management system to be present on device. Network mobility provides interfaces for applications to control the way they connect to network while connectivity management performs actual route selection and handles session continuity problems. This paper presents new Java development paradigm introduced with Network Mobility and Mobile Data Interfaces API (JSR-307), discusses requirements that implementation of this API puts on underlying operating system and proposes possible ways to fulfill these requirements on selected platform.
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D. Matijasevic (Ericsson Nikola Tesla d.d., Zagreb, Croatia), M. Zemljić, D. Matijašević (Ericsson Nikola Tesla, R&D Center, Zagreb, Croatia), D. Tošić, Z. Kalvarešin (University of Zagreb, FER, Zagreb, Croatia)
Adaptive Web-Based Monitoring and Management for Distributed Systems
Monitoring and managements functions are integral part of practically every computer system. Nowadays, when most of the systems are distributed, need for comprehensive and scalable system that would facilitate efficient management and monitoring operations on multiple remote nodes is ever more evident. Recent evolution in advanced Web technologies and rapid expansion of the Internet has facilitated means for development of efficient, low-cost and widely accessible monitoring tools.
In this paper, we build upon these facts to design and prototype a scalable and efficient monitoring and management system for administration of distributed computer nodes (i.e. clusters). Presented system is based on push technology which uses publish/subscribe mechanism for delivering monitored data to remote browser-based clients in real-time and with minimal communication overhead. Moreover, system architecture is made modular enough to facilitate easier integration of additional probes that collect monitored data on remote computers. Experiences with experimental use on real telecom cluster running highly available AAA (Authorization, Authentication and Accounting) service are also discussed.
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D. Šobar (Ericsson Nikola Tesla d.d., Zagreb, Croatia)
Integracija PSAP centara sustava E112 s IMS mrežama
Današnji sustavi E112 i pripadajući PSAP centri prilagođeni su povezivanju s tradicionalnim PSTN/ISDN mrežama i CS uslugama mobilnih mreža. Kako se sve više telekomunikacijskih usluga realizira putem širokopojasnih podatkovnih mreža, posredovanjem IMS sustava i sličnih tehnologija, treba razmotriti tehnološke zahtjeve za integraciju PSAP centara s IMS sustavima i maksimalno iskorištavanje mogućnosti koje nove usluge donose. Osim toga, treba uzeti u obzir i potencijalne probleme koje donosi povećana pokretljivost korisnika, kako geografska, tako i ona među različitim pristupnim mrežama.
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I. Budiselić, I. Žužak (FER, Zagreb, Croatia), I. Benc (Ericsson Nikola Tesla d.d., Zagreb, Croatia)
Application Middleware for convergence of IP Multimedia system and Web Services
Current network applications are typically created for one of two worlds. Communication applications targeting mobile devices usually communicate using the SIP protocol and are integrated into IP Multimedia systems of mobile network operators. On the other hand, applications targeting the enterprise market typically adhere to the SOAP protocol and integrate with Web Services exposed on the Internet. However, existing and future applications would benefit from access to services exposed by both of these protocols in both the mobile network and the Internet. In this paper we present the architecture of an application middleware that acts as a bidirectional gateway among IP Multimedia and Web Services systems. The middleware provides infrastructure for SIP and SOAP message handling, and session and network resource management. The middleware exposes interfaces for defining application specific rules for communication between protocol domains. Lastly, we outline a domain specific language that simplifies definition of such rules.
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| IP-1 Invited Presentation
Chair: Stjepan Golubić
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Ivan Uremović (Vipnet, Zagreb, Croatia)
HSPA Evolution
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| CTI-1 Software Development
Chair: Davor Šarić, T-Croatian Telecom, Zagreb |
M. Raos Jukić, N. Caparin (Ericsson Nikola Tesla, Zagreb, Croatia)
An Insight into Challenges in Development of Modern Telecommunication Systems
The market requirements and ever growing complexity of telecommunications' systems are defining the ways in which new solutions need to be developed. In order to produce reliable software in short time, on the market with continuously changing requirements and with appearance of new competitors, the way of working of telecom solutions providers necessarily needs changes. This paper gives an insight into the challenges that Ericsson Nikola Tesla Research and Development center faces when developing modern telecommunication systems, as well as proposed solutions to these challenges. Two areas are analyzed: Competence Management and Development Process. The paper is explaining in which way these two areas need to be adopted in order to overcome above-mentioned challenges with success.
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L. Drvodelic Cvitak (Ericsson Nikola Tesla , Zagreb, Croatia), Ž. Car (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Impact of Agile Development Implementation on Configuration and Change Management in Telecom Domain
Na primjeru procesa razvoja telekomunikacijskog sustava modelirati procesa upravljanja konfiguracijom i promjenama, te analizirati utjecaj implementacije procesa razvoja s povećanim stupnjem konkurentnosti. Analiza se provodi s naglaskom na upravljanje programskom konfiguracijom u uvjetima istovremene implementacije razlicitih grupa programskih zahtjeva. Novi procesa razvoja imat ce utjecaj na koordinaciju prikupljanja podataka relevantnih za upravljanje konfiguracijom i promjenama ,te na ažuriranje odgovarajuce projektne dokumentacije.
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D. Duka, L. Hribar (Ericsson Nikola Tesla, Split, Croatia)
Implementation of First Time Right Practice in Software Development Process
The pressure to improve software development process is not new, but in today’s competitive environment there is even greater emphasis on delivering a better service at lower cost.
Service providers care about quality of their services upon which they make investments. Software vendors care about their clients’ needs and efficiency in achieving them, a symptom of which is little to no rework – i.e., “get it done right the first time.”
The process named First-Time-Right (FTR) serves both these needs. It has both an external and an internal focus. Externally it focuses on the client; internally it can delineate where errors reside – notably are they within or upstream of the performance measurement group or system. The FTR splendidly balances customer focus and internal accountability. It delivers this balance at little cost in terms of both start up and ongoing maintenance. The FTR further provides the raw materials to produce a trend line of quality to see if the process has been measurably improved or not.
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I. Sinovčić, L. Hribar (Ericsson Nikola Tesla, Zagreb, Croatia)
How to Improve Software Development Process Using Mathematical Models for Quality Prediction and Elements of Six Sigma Methodology
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| CTI-2 Software Quality
Chair: Tihana Galinac, University of Rijeka, Faculty of Engineering |
Ž. Antolić (ERICSSON NIKOLA TESLA d.d., ZAGREB, Croatia)
Software Development Quality Plan - Organizational Assignment on Projects
This paper gives an overview of Software Development Quality Plan as organizational assignment towards the project dealing with non-technical requirements on work product related to the quality, processes and measurements. The basic principles of the quality planning, quality assurance and quality control are described. The importance of organizational involvement in quality requirements definition, follow-up, and corrective actions are discussed. In addition, one example of the Software Development Quality Plan is given. Some proposals and future directions in the area of software product quality and development process improvements are given.
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L. Hribar, D. Duka (Ericsson Nikola Tesla d.d., Split, Croatia)
Software component quality prediction using KNN and Fuzzy logic
Prediction of product quality within software engineering, preventive and corrective actions within the various project phases are constantly improved over the past decades. Practitioners and software companies were using various methods, different approaches and best practices in software development projects. Cost efficiency in software engineering in the last ten years was brought to a high level. Nevertheless, the issue of quality is pushing software companies to constantly invest in efforts to produce enough quality products that will arrive in time, with good enough quality to the customer. However, the quality is not for free, it has a price that is required at the time you notice about her. Using the prediction, characteristic parameters will be obtained and will lead to the conclusions very early in the project. Through the different methods, organization will provide targeted troubleshooting program that will increase the quality of the product.
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F. Urem, Ž. Mikulić (Veleučilište u Šibeniku, Šibenik, Croatia)
Developing Operational Profile for ERP Software Module Reliability Prediction
In predictive software reliability engineering we are usually estimating future occurrence using statistical models based on non-homogeneous Poisson process. All predictions are assigned to operational profile developed for reproducing real conditions during software testing. Making good operational profile is the only way to have good prediction model and software reliability growth. Usually these procedures are used in software development where the reliability is the most critical issue (military, aerospace and medical equipment industry) but we have tried to show that operational profiling can be the good way to improve current testing procedures in usual business software and as a final goal increasing dependability of the software. We have choose one program module developed in accounting ERP product named G2, developed in Croatian software company Swing Consulting as an example.
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F. Urem, F. Urem, Ž. Mikulić (Veleučilište u Šibeniku, Šibenik, Croatia)
Using NHHP model for ERP software module reliability growth
Enterprise Systems like ERP (Enterprise Resource Planning), have gained great significance for most companies on an operational as well as a strategic level. Failures (or more often changes) in ERP modules are stochastic processes and it is important for users to predict reliability of software product they are using in order to accept that as business risk. In this article we have tried to show how the Non Homogeneous Poisson Process (NHPP) approach can be applied therefore.
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A. Krajnc, J. Novak, R. Žontar (University of Maribor, Maribor, Slovenia)
Taxonomy of Static Code Analysis Tools
Static code analysis tools are becoming more and more crucial in the software development lifecycle. In this paper we will present today most commonly used static code analysis tools. Because there are many types of these tools for many purposes and many programming languages we will try to classify them according to several categories like: technology, rules available, supported languages, extensibility and several other categories and subcategories. The purpose of this article is not to show which static code analysis tool is superior and which not but to construct the taxonomy of static code analysis tools. After reading this article the reader will understand features and assets of the static code analysis tools.
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L. Skorin-Kapov, N. Katanić, T. Nenadić (Fakultet Elektrotehnike i Računarstva, Zagreb, Croatia), S. Dešić (Ericsson Nikola Tesla d.d., Zagreb, Croatia), L. Skorin-Kapov (Fakultet Elektrotehnike i Računarstva, Zagreb, Croatia)
Automated generation of TTCN-3 test scripts for SIP-based calls
The complexity of modern telecommunications systems implies the need for thorough and systematic software testing. Software testing is an expensive and time-consuming task involving specification of what and how to test, and preparation of test descriptions in a format that is accepted by the test equipment. To cut down the cost of manual testing and to increase its reliability, steps may be taken to automate the whole test case preparation process. The Testing and Test Control Notation Version 3 (TTCN-3) is an internationally standardized language for defining test specifications for a wide range of computer and telecommunication systems. It allows the concise description of test behaviour by unambiguously defining the meaning of a test case pass or fail. In this paper, we describe a model for automatic test generation, and describe an implemented solution for automatic generation of TTCN-3 test scripts based on parsing SIP call traces. The implemented solution is tested using TITAN, a TTCN-3 test execution environment developed in Ericsson.
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J. Krizanic (Ericsson Nikola Tesla d.d., Zagreb, Croatia), A. Grgurić, M. Mošmondor, P. Lazarevski (Ericsson Nikola Tesla, Zagreb, Croatia)
Load Testing and Performance Monitoring Tools in Use with AJAX Based Web Applications
In order to deliver quality assured software and avoid potential costs caused by unstable software, two of the most important procedures are: load testing of the software and performance monitoring of the hosting environment. In the case of web applications which are today widely used, one fact is obvious: most of web applications are public and used by vast number of users, which are making a considerable traffic load on hosting environments and web applications. Both procedures become facilitated with existing tools aimed for load testing and performance monitoring. In the paper we analyze and compare several existing tools for these two procedures in order to find the most appropriate tools in terms of parameters like ease of use, supported features, and license. Selected tools were put in action in the real environment, through several web applications delivered by Ericsson Nikola Tesla. For the case study one of the delivered applications is used in order to introduce different capabilities of tools, including distributed testing, assembling of test scenario from previously recorded usage scenarios, security support, results analysis, monitoring of key parameters, and reporting and alerting about changes of these parameters.
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| CTI-3 Network Development
Chair: Darko Huljenić, Ericsson Nikola Tesla, Zagreb |
S. Carin (Multicom d.o.o., Zagreb, Croatia)
Developing Telecommunications Rating System Using Oracle PL/SQL
This paper presents main steps in developing Telecommunications rating system using Oracle PL/SQL (Procedural Language/Structured Query Language) and problems that occurred during this process. Advantage of this system is that it runs on database server what increases maintainability and security and also enables significant reduction of network traffic. In rating goal is to maximize number of transactions that can be processed per second and therefore number of context switches between SQL and PL/SQL engine had to be minimized. To avoid unnecessary queries to database stored procedures with table data are dynamically generated and used instead of select statements. For same reason subscriber data like counters and parameters are loaded into memory structures (PL/SQL collections) using bulk collect and then along with results of transaction rating inserted into database using bulk operations. Comparison of this method to pure PL/SQL without collections and dynamically generated procedures is also given.
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D. Majačić (Ericsson Nikola Tesla, Zagreb, Croatia), K. Pećnik (TELEGRA D.O.O., Zagreb, Croatia)
The role of MSC server in LTE based network architecture
LTE is new technology for mobile telecommunications that take in consideration all architecture elements from current mobile networks.
Every new technology is much better accepted if it offers interoperation with network elements that are currently used. Goal of this paper is to examine position of MSC server in core networks after introducing of LTE system in already complex mobile networks. Starting point is that current mobile networks with MSC server are using CS access and ISUP protocol for voice services, while LTE networks are pure PS networks and main protocol is SIP protocol. This paper will analyze requirements for MSC Server for interoperation with LTE and IMS systems. Also possibility of using voice services and SMS in LTE networks and continuity of voice session while changing access network will be analyzed.
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S. Bobić, M. Rogoznica (Ericsson Nikola Tesla, Zagreb, Croatia)
Introduction of multiprocessoring architecture of MSC node
The growing operators' demands for higher traffic capacity together with the option of
scalability, improved network redundancy and even better in service performance mainly focused on decreasing
the downtime are placed on telecom industry. In order to meet the operators' demands the suggested solution
is introducing the change of the traditional MSC node architecture from one processor system to multiprocessor system.
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T. Iliev, G. Hristov, P. Zahariev, M. Iliev (University of Ruse, Ruse, Bulgaria)
An approach for energy optimisation in wireless sensor networks
This paper presents a study on the optimal cluster numbers and the effective radius of the clusters in wireless sensor networks (WSN) with the purpose of decreases of energy consumption of separate sensor. Many routing protocols have been developed to meet the unique and challenging characteristics of WSN like notably very limited power resources to sustain an expected lifetime of perhaps years, and the restricted computation, storage and communication capabilities of nodes that are nonetheless required to support large networks and diverse applications. In this paper we proposed scheme which extended the network lifetime and due to their lightweight architecture they are very efficient on WSN nodes with constrained resources.
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P. Zahariev, G. Hristov, T. Iliev (University of Ruse, Ruse, Bulgaria)
A method for reducing the energy dissipation in wireless sensor networks using edge node
Wireless sensor networks (WSN) are currently receiving significant attention due to their unlimited potential and many fields of application. Prolonged network lifetime, scalability, and load balancing are important requirements for many sensor network applications. Clustering sensor nodes is an effective technique for achieving these goals. In this work, we propose a new approach for reducing the energy dissipation in the network. The main idea behind the approach is the introduction of an edge sensor, which acts as both data aggregation point for all cluster heads and a connection point between the base station and the cluster field.
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| CTI-6 Optical Network
Chair: Saša Dešić, Ericsson Nikola Tesla Zagreb |
D. Bilajbegovic (Nokia Siemens Networks d.o.o., , )
New Generation of Optical Access Networks
Currently the biggest portion of the Optical Access Networks is based on either on the PON technology or on the pure Ethernet access. Optical access technologies currently offer adequate bandwidth but all of them are based on the short term development plans. They are not designed to support future extension of the networks. This paper gives a perspective to which directions current optical access should be developed, what are the main obstacles and how to solve it. It also gives the perspective when the New Generation Optical Access technologies should be implemented and ready for the first installation in the operators networks and how to combine current optical networks with the NGOA.
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I. Jurdana (Pomorski fakultet Rijeka, Rijeka, Croatia), M. Štrlek, R. Ivče (Pomorski fakultet, Rijeka, Croatia)
Primjena bežičnih optičkih komunikacijskih mreža u pomorstvu
Nova tehnologija bežičnog optičkog prijenosa informacija počela je zamjenjivati tradicionalne tehnologije prijenosa podataka u kopnenim mrežama. Razlog tome su brzine prijenosa usporedive sa svjetlovodnim kabelskim sustavima prijenosa ali i činjenica da za prijenos signala nije potreban valovod. Takvi sustavi zasigurno će naći svoju primjenu i u zahtjevnom okolišu kao što su brodovi i strukture vezane uz pomorstvo. U radu se razmatraju trenutna tehnološka dostignuća na tom području kao i mogućnost primjene na brodovima i umrežavanju brodskih računalnih sustava, povezivanju brodova s obalnim terminalima uz implementaciju širokopojasnog pristupa na fiksnu telekomunikacijsku mrežu, te moguća primjena u mobilnim komunikacijama kao što su satelitske komunikacijske veze.
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M. Furdek, N. Skorin-Kapov, M. Bosiljevac, Z. Šipuš (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Analysis of Crosstalk in Optical Couplers and Associated Vulnerabilities
As a result of the huge potential bandwidth of optical fibers, optical networks have been established as the enabling technology for long-haul high-speed backbone networks based on Wavelength Division Multiplexing (WDM). Considering physical layer impairments and vulnerabilities associated with optical components is of utmost importance to ensure successful network operation. Optical couplers, the building blocks of key network components such as multiplexers, demultiplexers and optical cross-connects, are prone to signal leaking and suffer from significant levels of crosstalk. This makes it possible for components of signals routed on different wavelengths to leak into unintended outputs and interfere with each other. Hence, the ratio between the wanted signal and unwanted interference at the output is deteriorated. In this paper, we analyze the effects of crosstalk in optical couplers and at the components, as well as methods which can enable malicious users to exploit the associated vulnerabilities to cause service degradation or eavesdropping.
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M. Furdek, M. Bosiljevac, N. Skorin-Kapov, Z. Šipuš (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Gain Competition in Optical Amplifiers: A Case Study
Transparent optical networks based on wavelength-division multiplex (WDM) are an emerging solution for growing network traffic demands. However, compared to traditional electro-optic networks, transparency also brings new security challenges, accompanied by new vulnerabilities in the network. One such vulnerability is associated with optical amplification. The most commonly used optical amplifier is the EDFA (Erbium-doped fiber amplifier), which uses doped optical fiber as a gain medium to amplify an optical signal. Due to the limited number of the available upper-state photons necessary for amplification, the EDFAs have limited gain, which has to be divided among all incoming signals. Each of the signals is granted photons proportionally to its power level, which can lead to a situation called gain competition. In this paper, we investigate the effects of gain competition with a case study in the laboratory, and analyze the associated risks for network operation.
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| CTI-5 Mobile e-health
Chair: Davor Šarić, T-Croatian Telecom, Zagreb |
V. Galetić (Ericsson Nikola Tesla d.d., Zagreb, Croatia), I. Benc, S. Dešić, J. Križanić, M. Mošmondor, A. Grgurić, D. Gvozdanović, D. Huljenić, L. Damjanić, M. Ravić (Ericsson Nikola Tesla, Zagreb, Croatia)
Ericsson Mobile Health Solution Overview
Business processes exercised in the healthcare domain need a substantial redefinition and adjustment to the new requirements on healthcare systems, such as increasing services quality while retaining or even lowering overall costs. Ericsson Mobile Health (EMH) is a system that offers healthcare professionals a set of features pertaining to mobile collecting of and access to patient medical data. EMH introduces mobility into a healthcare system, which ensures a significant increase of healthcare services quality level. It is a lightweight yet robust system that periodically or continuously measures patient’s vital values and forwards them to medical experts via wireless and wireline technologies. These medical data can therefore be obtained and analysed by authorised parties. The paper brings forth the main features of EMH focusing on handling the medical data originating at the mobile client side and transferred to the server side. Ultimately, it is available on a physician’s PC screen.
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A. Grgurić (Ericsson Nikola Tesla d.d. , Zagreb, Croatia), S. Dešić, M. Mošmondor, I. Benc, J. Križanić, P. Lazarevski (Ericsson Nikola Tesla, Zagreb, Croatia)
Proof-of-concept applications for validation of ICT services for elderly care
The goal of 6th Framework Programme (FP) Project MPOWER was to define and implement an open platform to simplify and speed up the task of developing and deploying services for persons with cognitive disabilities and elderly. In other words, to support older people living independently in their homes as long as possible, with a good quality of life. Two proof-of-concept applications (PoCa) which were used to validate MPOWER architecture and middleware components played a very important roles in the project. This paper describes these PoCas, namely Norwegian (Information access and sharing) and Polish (Smart Home environment) and then focuses on the technical prerequisites for their implementation. The work will be continued through the new, FP7 project named universAAL.
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M. Mosmondor (Ericsson Nikola Tesla d.d. , Zagreb, Croatia), I. Benc, S. Dešić, A. Grgurić (Ericsson Nikola Tesla, Zagreb, Croatia)
A Feasibility Study for the Integration of a Remote Patient Monitoring Solution with Electronic Health Record System
Existing and emerging healthcare information systems are based on the use of electronic health records (EHR). Over the past years, European governments have identified the EHR as the basis for nation-wide exchange and seamless integration of patient medical data. On the other hand, the remote patient monitoring (RPM) emerges as a new way to diagnose and monitor patients in their homes and everyday environment. In general, the integration of RPM solutions with EHR based systems has to date been hindered due to numerous and often conflicting standards. In this paper we present a feasibility study for the integration of a RPM solution into an EHR based system. We concentrate on CEN based EHR specification and propose several extensions to incorporate data acquired from the RPM system. We present our findings in the scope of envisioned Croatian e-health eco- system composed of Healthcare Networking Information System EHR solution and Ericsson Mobile Health RPM solution.
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I. Ćubić (Ericsson Nikola Tesla d.d., Zagreb, Croatia), I. Markota (Ericsson Nikola Tesla, Split, Croatia), I. Benc (Ericsson Nikola Tesla, Zagreb, Croatia)
Application of Session Initiation Protocol in Mobile Health Systems
Mobile health or m-health is not more a cool new application riding on mobile wave. It is becoming integral and important part of the health care eco-system that tackles the problems of aging population, growing health care expenses and support for innovation in health care and public health. This shift brings m-health systems in though, everyday life arena where aspects such as usefulness, flexibility, business models and integration with existing health and telecommunication systems becomes more important. In this paper we investigate potential application of Session Initiation Protocol (SIP) as a communication paradigm for the mobile health system. Specifically, we investigate how SIP communication may facilitate use of selected telecommunications service such as video streaming in the mobile health system.
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| IP-2 Invited Presentations
Chair: Vlasta Hudek, T-Croatian Telecom, Zagreb |
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Ivica Rade (Siemens, Split, Croatia)
Doing Agile @ Siemens IT Solutions and Services
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Jasmina Jakelić (Siemens, Split, Croatia)
Quality Management in Software Development Projects at Siemens
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| IP-3 Invited Presentations
Chair: Branko Mikac, University of Zagreb, Faculty of Electrical Engineering and Computing |
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Tomislav Boroša, Asen Hajcik (Nokia Siemens Networks Zagreb, Croatia)
Personalized Holistic TV Experience |
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Mladen Jureša (Hrvatske telekomunikacije, Zagreb, Croatia)
Televizija nove generacije u telekom okruženju |
| CTI-7 Network Management
Chair: Branko Mikac, University of Zagreb, Faculty of Electrical Engineering and Computing
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Ž. Deljac (HT - HRVATSKE TELEKOMUNIKACIJE d.d., ZAGREB, Croatia), R. Moštak, T. Stjepanović (HT-Croatian telecommunications, Zagreb, Croatia)
A BB Network Faults Simulator Based on Neural Networks
The aim of this paper is to explore possibilities of use of neural networks to create a simulator of user interference on broadband networks. The model is made on the basis of one-year monitoring of broadband interferences, divided by service, reporting day of the week and the exact time of occurrence. The basic idea is to create a neural network capable to accept the three groups of input data (time, date and service), and calculate the number of disturbances in the time unit for a given service as output data. It is also added dispersion in form of white noise based on actual values. Accuracy check of the tested model is made by comparing the simulated and real data.
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S. Baraković (Ministry of Security of Bosnia and Herzegovina, Sarajevo, Bosnia and Herzegovina), J. Baraković (BH Telecom, Sarajevo, Bosnia and Herzegovina)
Comparative Performance Evaluation of Mobile Ad Hoc Routing Protocols
A Mobile Ad Hoc network (MANET) is a group of mobile nodes that are dynamically and arbitrarily located in such a manner that the interconnections between nodes are capable of changing on a continual basis. Although numerous routing protocols have been proposed for mobile ad hoc networks, there is no universal scheme that works well in scenarios with different network sizes, traffic loads and node mobility patterns, so mobile ad hoc routing protocol election presents a great challenge. This paper shows comparative performance evaluation of two prominent on-demand reactive routing protocols in mobile ad hoc networks: Ad Hoc On-demand Distance Vector (AODV) and Dynamic Source Routing (DSR), along with the traditional proactive protocol Destination Sequenced Distance Vector (DSDV). Comprehensive analysis has been carried out based on the results obtained by running simulations with different load and mobility scenarios in Network Simulator NS-2. Used comparative parameters are packet delivery ratio, average end-to-end delay and normalized routing load. The general observation of the results indicate that considered protocols react in similar way in low load and low mobility scenarios, but under high mobility DSR outperforms AODV and DSDV protocols, although DSR and AODV share similar on-demand behaviour.
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D. Priselac (Ericsson Nikola Tesla d.d., Zagreb, Croatia), D. Marijić (Ericsson Nikola Tesla, Zagreb, Croatia), M. Mikuc (Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia)
Analysis of DoS/DDoS attack methods on IMS system
Users of IP Multimedia Subsystem (IMS) usually access the system from IMS provider’s own fixed or mobile IP access network but providers also allow their users to access the IMS system from the Internet. With connection to Internet the IMS system is exposed to denial of services (DoS) attacks. DDoS is a distributed form of DoS attack that represents a real security threat to IMS systems. DoS/DDoS attacks could be carried out with various types of packets sent to IMS system. This paper analyzes DoS/DDoS attack methods on an IMS system, their impact on different parts of the IMS system and scope of existing protection measures.
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O. Jukić (Visoka škola za menadžment u turizmu, Virovitica, Croatia), M. Kunštić (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
ABCDE – Alarm Basic Correlations Discovery Environment
Alarms generated by the telecommunication network are processed by network personnel who are required to respond within a reasonable time interval. When a global network problem occurs, it is represented as a sequence of alarms coming from one or more different network elements. That sequence is typically not recognized as a specific, global problem, or the presence of a global problem is detected, but not its nature. The reason for that is because of the huge number of alarms generated which cause the operator to be overwhelmed. Automatic recognition of network problems is very useful for network monitoring processes. Automatic recognition and detection can be done by simple IF-THEN rules performed on incoming alarm streams, called correlation rules. The problem is in recognizing potential correlation rules candidates. In our previous works, we have marked mathematical Apriori algorithm implementation as a potential improvement for potential correlation rules detection. This paper describes architecture proposal for Alarm Basic Correlations Discovery Environment, opening discussion on some implementation aspects. Further work will be focused on its implementation as well as experimental results obtained by its implementation on real network alarm data.
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A. Kerner (Ericsson Nikola Tesla d.d., Zagreb, Croatia), M. Cotiga (Ericsson, Struer, Denmark), P. Cota (Ericsson, Zagreb, Croatia)
Analiza ADSL linija primjenom ERICSSON CPM sustava
U radu je objašnjen pristup u primjeni Copper Plan Manager sustava (CPM) na analizi ADSL linija u produkciji kod broadband (BB) Operatora. Opisana je analiza rezultata jednog ciklusa monitoringa i priprema prijedloga za promjenu korisničkih profila. U konkretnom slučaju Operator želi osigurati maksimalnu raspoloživost servisa uz minimalno narušavanje performansi vodova. Osim analize pojedine linije odnosno komunikacijskog kanala CPM je namjenjen i praćenju ukupnih performansi BB sustava i međuzavisnosti odnosno utjecaju pojedinih linija. Na taj način pomaže se broadband operatorima dovesti provizioniranje usluga i prevenciju pogrešaka na viši nivo tako da se koriste parametri za performanse i status a na temelju podataka koje pribavlja line testing mehanizam ugrađen u DSLAM uređaju.
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| CTI-9 Transfer Modes
Chair: Darko Švelec, T-Croatian Telecom, Zagreb |
D. Mitic (IRITEL, Beograd, Serbia), A. Lebl (IRITEL A.D., Belgrade, Serbia)
Packet loss in the local network of IRITEL
U ovom radu je razmatrano slanje paketa sa osam IP adresa na jednu IP adresu koje se nalaze u lokalnoj IP mreži IRITEL. Pored toga slati su paketi poruka sa jedne IP adrese na tu istu IP adresu. Paketi su slati preko UDP (User Datagram Protocol, UDP) protokola. U jednoj poruci je 10000 bajta, a to predstavlja jedan paket. Posle svake poruke (paketa) obezbeđen je među paketski interval od 20mS. Broj ovako poslatih poruka (paketa) je oko 1020000. Na prijemu je došlo do gubitaka poruka (paketa), broj primljenih paketa je bio manji od broja poslatih paketa, pa je stoga izvršena analiza primljenih paketa. Ovaj članak će pored opisa nekih modela gubitaka paketa dati i analizu za gubitke paketa podataka u lokalnoj IP mreži IRITEL.
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D. Žigman, M. Bošnjak-Mehmedović (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Prijenos posebno označenih paketa preklapanjem
Uvod u VPN. Opis VPN sloja 2 i sloja 3, te njihove značajke. MPLS ukratko, način rada, osnovna konfiguracija. MPLS VPN, osnovne karakteristike i prednosti pred uobičajenim načinima VPN-a. MPLS VPN arhitektura. Objašnjenje VRF tabela. Primjer jednostavnog VPN i objašnjenje konfiguracije. Prednosti, razvoj i budućnost MPLS-a.
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M. Hosseinpour, M. Tunnicliffe (Kingston University, London, United Kingdom)
“Packet-Pair Behavior in Wired and 802.11-type Wireless Connection and the use of Data Clustering Algorithms for dispersion-mode Tracking“
Bandwidth probing in an ad hoc wireless environment, as simulated using an OPNET model, shows some interesting deviations from typical wired behavior with and without the introduction of cross traffic. Real-time mode-tracking using the Gaussian-mix and adapted kernel-density methods have been compared for both the wired and wireless scenarios. The two models produced broadly similar results, including the ability to track node activity in real time.
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M. Pilipović (RT-RK, Novi Sad, Serbia), D. Samardžija (University of Novi Sad, Novi Sad, Serbia)
On Efficiency of Link Adaptation Mechanisms in H/ARQ Systems
In this study we analyze the synergy effects among ARQ and Hybrid ARQ with rate-adaptive mechanisms. We present several coding and decoding schemes and link adaptation techniques for rate-adaptive transmission, and we discuss their performance. We describe approaches for searching and selecting the best modulation and coding scheme (MCS) based on channel quality information(CQI). Hybrid ARQ using punctured convolutional codes is used with variable re-transmission packet size and code rate according to CQI. Attractive simulation results are issued and they may be used as a basis for performance trade-off.
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I. Marijašević (HT, Osijek, Croatia), M. Janković (Hrvatske telekomunikacije, Zagreb, Croatia), D. Žagar (Faculty of Electrical Engineering, Osijek, Croatia)
Application for voice transfer through Internet protocol
Abstract –This text shows program solution for transferring voice data through Internet protocol. In order to transfer data between two or more terminals, specific steps are needed in HW and SW to get media information and adjust them for sending through computer network. For satisfying quality, network must be able to transfer at certain speed and with minimum delay. Program code has to be optimized so that any terminal delays in performing programmed functions are down to their minimum level.
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T. Tadić (Ericsson Nikola Tesla d.d., Zagreb, Croatia), D. Petrinović (Sveučilište u Zagrebu, Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Adapting Entropy Constrained Coding of Spectral Envelope for Fixed-Rate Coding in AMR Speech Codec
The AMR speech codec operates in 8 different fixed-rate modes. It encodes the spectral envelope of the current speech frame by means of LSF parameters, using a specified number of bits. However, by using an alternative transform coding technique, the quantization of the spectral envelope can be significantly improved in the spectral distortion sense. This technique involves uniform scalar quantization of the decorrelated vector components followed by efficient entropy constrained coding, which produces a variable bit-rate output. This paper describes the techniques used to adapt this variable bit-rate output to the AMR codec modes which use fixed-rate output bit strings.
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L. Zhao, J. Ge, W. Yin (XIDIAN University, Xi'an, China)
Joint Adaptive and Self-Optimized Equalizer and Spatial-Temporal Focusing for Underwater Acoustic Communications
Multi-Channel Decision Feedback Equalizer (MC-DFE) is the main method to overcome multi-path fading and eliminate Inter-Symbol Interference (ISI) for underwater acoustic coherent communications. To reduce computational complexity and optimize the equalization algorithm, based on adaptive and self-optimized pre-combination multi-channel decision feedback equalizer, spatial-temporal focused adaptive and self-optimized equalizer is proposed which consists of spatial-temporal focusing processor and adaptive and self-optimized decision feedback equalizer. The simulation experiments results show that the proposed algorithm performance is better than available algorithms. And, the proposed algorithm can further reduce computational complexity of adaptive and self-optimized pre-combination multi-channel decision feedback equalizer without reducing the equalization algorithm performance.
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| CTI-11 Implementations in Practice
Chair: Željko Antolić, Ericsson Nikola Tesla, Zagreb |
D. Žigman, M. Zorić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Elektronički sigurnosni sustavi preko IP-a
U ovom radu govorit će se o elektroničkim sigurnosnim sustavima preko IP-a, točnije o sustavu kontrole i registracije prolazaka, te sustavu stalnog nadzora štićenog objekta (video nadzorni sustav). Radom će se prikazati usporedbu dva različita tipa IP sustava, njihovu izvedbu, prednosti i mane.
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D. Žigman, I. Kosak, D. Pongrac (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Bežična mreža 5net Petrinja
Rad „Bežična mreža 5net Petrinja“ obuhvaća sve radnje koje su potrebne da se implementira bežična mreža na području manjeg grada i okolice. Opisane su prednosti i nedostaci bežičnih mreža kao i pogodnosti koje nude računalne mreže svojim korisnicima. Pregledom svih standarda za bežičnu komunikaciju koji se nude, te opreme i softvera pristupa odabirom najpovoljnijih lokacija za postavljanje istih. Pošto je konkretno riječ o neprofitabilnoj udruzi građana opisan je put od korištenja najjeftinije i lako dostupne opreme do profesionalnih rješenja koja nude pouzdan rad bežične mreže. Također su navedene radnje koje bi trebale uslijediti kako bi se dotična mreža još unaprijedila.
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A. Medić, A. Golubović (Infosys doo, Bosanska Krupa, Bosnia and Herzegovina), J. Ćosić (MUP USK, Bihać, Bosnia and Herzegovina)
Integracija VoIP i PSTN platformi
Povezivanje telefonskih sustava pomoću VoIP tehnologije postaje sve više prisutno, skoro i neophodno, u našem poslovanju, s tim da je od posebnog značaja međusobno spajanje poslovnih IP PBX komunikacijskih sustava sa javnom telefonskom mrežom nove generacije. Ukoliko se bavimo problematikom ove prirode, moramo biti svjesni da na tržištu postoje razna rješenja, te se u prvi plan moraju staviti kompatibilnost, standardizacija, te smjernice koje bi opisale način komunikacije između proizvoda različitih proizvođača, što u biti znači da moramo odrediti određenu razinu interoperabilnosti. U radu će biti predstavljen način na koji se mogu integrirati dvije tehnologije, koje su danas većinom zastupljene u VoIP komunikaciji.
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M. Kostadinović (Faculty of Traffic and Transport Engineering, University of East Sarajevo, Doboj, Bosnia and Herzegovina), M. Kostadinović (University of East Sarajevo, Faculty of Traffic and Transportation, Doboj, Bosnia and Herzegovina), Z. Bundalo (University of Banja Luka, Faculty of Electrical Engineering, Banja Luka, Bosnia and Herzegovina), D. Bundalo (UniCredit Bank, Banja Luka, Bosnia and Herzegovina)
Planning and management of WirelessHart network
Wireless networks are very often used in the process industry. One of such networks is the WirelessHart network. The planning and management of the WirelessHart network in the process industry is considered and described in this paper. In order to analyze behavior of the WirelessHart network in the process industry, in the paper are first described devices that are used in the network, the gateway and the transmitters. Then the results of simulation for planning and managing of execution of the communication in the network using AMS Wireless Configurator and SNAP-ON application are presented.
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J. Nižić, O. Labor, M. Mićin, J. Nižić, Z. Žunko (Eurocomputer Systems d.o.o., Zagreb, Croatia)
The Experience of Using Open Source Technologies for Implementation of Mobile Value Added Services
Value Added Services (VAS) are nowadays well established in the mobile services domain, helping to grow traffic revenues and profit, providing the end users with real-life benefits. There are different technology approaches while developing such services, from using any of the available Service Delivery Platforms (SDP) to J2EE standalone application development. This article presents the experience of developing such a service, with employment of available Open Source technologies like Spring, Hibernate, Quartz, Tapestry and GlassFish as an J2EE application server. Through the description of the software system architecture and functionalities of the service, problems and benefits of using Open Source framework in relation to other mentioned approaches are stated. This article describes collected experiences while considering requirements for high availability and robustness of the telecom service.
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A. Volkov (Iskratel d.o.o., Kranj, Slovenia), T. Javornik (Jozef Stefan Institute, Ljubljana, Slovenia)
Implementing asynchronous zero-copy API for embedded IVR application
This paper describes the original solution of zero-copy asynchronous communication between a channel-level driver and an embedded IVR (Interactive Voice Response) application running on SI3000 Integrated Call Server. This solution implements platform-specific back-end for open VoiceXML Interpreter required to run it on MPC8560 communication controller. Solution was redesigned and ported from VxWorks to Embedded Linux. The goal of this redesign is scalability: good performance and deterministic behavior on high loads.
The presentation also covers some common challenges that developers encounter while porting legacy VxWorks applications to Linux: choosing I/O strategy and synchronization methods, implementing shared memory access. I hope this practical experience will be useful to other developers moving their drivers from proprietary RTOSes to Embedded Linux.
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D. Palata (Ericsson Nikola Tesla d.d., Zagreb, Croatia), M. Kontak (Ericsson Nikola Tesla, Zagreb, Croatia)
Konvergentna naplata u pokretnim telekomunikacijskim mrežama
Telekomunikacijska industrija je doživjela značajne promjene u zadnjih nekoliko godina i svaki dan možemo vidjeti primjere novih tehnologija koje povećavaju kompleksnost u telekomunikacijskim mrežama, napredne i inovativne proizvode usmjerene prema različitim skupinama korisnika.
Ključni izazov za nastavak razvoja multimedijskih usluga je stvaranje novih poslovnih i cijenovnih modela koje će privući korisnike, kao i vlasnike i distributere sadržaja. Cijene moraju biti prihvatljive i jasne za krajnje korisnike, uz kontrolu troškova u svakom trenutku.
Rješenje za konvergentnu naplatu predviđa horizontalnu arhitekturu, gdje funkcionalnosti svakog sloja omogućuju zajedničko upravljanje naplatom za sve pretplatnike i usluge. Predloženo rješenje može se podijeliti u 4 sloja prema funkcijama koje ti slojevi obavljaju (skrb o korisnicima, računi, terećenje i kontrola sesije).
Takva arhitektura omogućava podršku za različite segmente korisnika i omogućava značajne komparativne prednosti povećavanjem marketinških mogućnosti, troškovne učinkovitosti i financijskog upravljanja rizikom.
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| CTI Closing
Chairs: Stjepan Golubić et all. |
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Basic information:
Chairs:
Stjepan Golubić (Croatia), Branko Mikac (Croatia), Vlasta Hudek (Croatia)
Steering Committee:
Željka Car (Croatia), Miroslav Karasek (Czech Republic), Antonio Teixeira (Portugal)
International Program Committee Chairman:
Petar Biljanović (Croatia)
International Program Committe:
Alberto Abello Gamazo (Spain), Slavko Amon (Slovenia), Michael E. Auer (Austria), Mirta Baranović (Croatia), Ladjel Bellatreche (France), Nikola Bogunović (Croatia), Peter Brezany (Austria), Željko Butković (Croatia), Željka Car (Croatia), Matjaž Colnarič (Slovenia), Alfredo Cuzzocrea (Italy), Marina Čičin-Šain (Croatia), Dragan Čišić (Croatia), Todd Eavis (Canada), Maurizio Ferrari (Italy), Jasna Glavaš (Croatia), Matteo Golfarelli (Italy), Stjepan Golubić (Croatia), Francesco Gregoretti (Italy), Niko Guid (Slovenia), Yike Guo (United Kingdom), Ladislav Hluchy (Slovakia), Vlasta Hudek (Croatia), Željko Hutinski (Croatia), Mile Ivanda (Croatia), Robert Jones (Switzerland), Peter Kacsuk (Hungary), Aneta Karaivanova (Bulgaria), Miroslav Karasek (Czech Republic), Bernhard Katzy (Germany), Christian Kittl (Austria), Miljenko Krvišek (Croatia), Mladen Mauher (Croatia), Branko Mikac (Croatia), A. Min Tjoa (Austria), Jadranko F. Novak (Croatia), Jesus Pardillo (Spain), Nikola Pavešić (Slovenia), Ivan Petrović (Croatia), Radivoje S. Popović (Switzerland), Ognjen Prnjat (Greece), Slobodan Ribarić (Croatia), Karolj Skala (Croatia), Ivanka Sluganović (Croatia), Vanja Smokvina (Croatia), Ninoslav Stojadinović (Serbia), Aleksandar Szabo (Croatia), Laszlo Szirmay-Kalos (Hungary), Jadranka Šunde (Australia), Antonio Teixeira (Portugal), Roman Trobec (Slovenia), Ivana Turčić Prstačić (Croatia), Walter Ukovich (Italy), Mirko Varga (Croatia), Boris Vrdoljak (Croatia), Dalibor Vrsalović (Croatia), Robert Wrembel (Poland), Baldomir Zajc (Slovenia)
Scope:
- Information systems in telecommunications
- Integration of information and communications solutions
- Information technology in research and development of telecomm systems
- New generation networks
- Wireless and wireline communications
- Multimedia communications
- Internet and new IP services and applications
- Enterprise infrastructure and applications
- E-systems
- Mobile terminal/handsets and operating systems/platforms
- Telecommunication network management
- Telecomm protocols
- Information processing and security
- Network performances and quality of service
- Software development and maintenance
- Measurements and testing
- Environmental aspects of telecomm products and services
The theme in focus this year is mHealth or telemedicine.
Official languages are English and Croatian.
Location:
Opatija, often called the Nice of the Adriatic, is one of the most popular tourist resorts in Croatia and a place with the longest tourist tradition on the eastern part of Adriatic coast. Opatija is so attractive that at the end of the 19th and beginning of the 20th centuries it was visited by the most prominent personalities: Giacomo Puccini, Pietro Mascagni, A. P. Čehov, James Joyce, Isidora Duncan, Beniamino Gigli, Primo Carnera, Emperor Franz Joseph, German Emperor Wilhelm II, Swedish Royal Couple Oscar and Sophia, King George of Greece.
The offer includes 20-odd hotels, a large number of catering establishments, sports and recreational facilities.
For more details please look at www.opatija.hr/ and www.opatija-tourism.hr/.
Registration / Fees:
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REGISTRATION / FEES
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Price in EUR
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Before May 10, 2010
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After May 10, 2010
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| Members of MIPRO and IEEE |
180
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200
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| Students (undergraduate), primary and secondary school teachers |
100
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110
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| Others |
200
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220
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Contact:
Stjepan Golubić
Ericsson Nikola Tesla Inc.
Krapinska 45
HR-10000 Zagreb, Croatia
Phone: +385 1 365 4580
Fax: +385 1 365 3156
E-mail: stjepan.golubic@ericsson.com
Upozorenje
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