Goran Marković

The Proceedings of the XLIII Symposium on Novel Technologies in Postal and Telecommunications Traffic – PosTel 2025 include the research results in the field of postal and telecommunications traffic completed over the past year. The Symposium is organized by the Department of Postal and Telecommunications Traffic of the Faculty of Transport and Traffic Engineering in Belgrade. The co-organizers are: JP “Pošta Srbije”, “Telekom Srbija” a.d., and the Regulatory Agency for Electronic Communications and Postal Services – RATEL. The event is held under the auspices of the Ministry of Science, Technological Development and Innovation of the Republic of Serbia and the Ministry of Information and Telecommunications of the Republic of Serbia. The Symposium focuses on current research in areas of particular importance for postal and telecommunications traffic in Serbia and the surrounding region. The papers are invited and grouped into three sections: • Management of Processes in Postal and Telecommunications Traffic• Postal Traffic, Networks and Services• Telecommunications Traffic, Networks and Services The section Management of Processes in Postal and Telecommunications Traffic encompasses current research and practical solutions that reflect the deep transformations underway in the modern postal and telecommunications sectors. The papers in this section address key topics such as digitalization, sustainability, inclusivity, technological innovation, and new management models. Special attention is given to the role of public–private partnerships, the application of ESG standards, user protection, development of e-services, and the modernization of operations based on IoT technologies. Through various case studies and analytical approaches, the papers highlight the need for organizational reconfiguration of postal operators, the development of inclusive services, and the improvement of user experience quality. This section provides a comprehensive insight into the challenges and opportunities shaping the future of the postal and telecommunications system, emphasizing the importance of strategic management in the process of digital and green transition. The section Postal Traffic, Networks and Services contains papers that, from scientific and professional perspectives, analyze the postal sector and related current developments. Among other topics, the authors explore strategic directions of postal traffic development and models for applying modern information technologies to optimize. Zbornik radova XLIII Simpozijuma o novim tehnologijama u poštanskom i telekomunikacionom saobraćaju - PosTel 2025, sadrži rezultate istraživanja iz oblasti poštanskog i telekomunikacionog saobraćaja u proteklom jednogodišnjem periodu. Organizator Simpozijuma je Odsek za poštanski i telekomunikacioni saobraćaj Saobraćajnog fakulteta u Beogradu. Suorganizatori su: JP ″Pošta Srbije″, ″Telekom Srbija″ a.d. i Regulatorno telo za elektronske komunikacije i poštanske usluge – RATEL.Pokrovitelji su: Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije i Ministarstvo informisanja i telekomunikacija Republike Srbije.Tematika Simpozijuma vezana je za aktuelna istraživanja u oblastima od posebnog značaja za poštanski i telekomunikacioni saobraćaj, kod nas i u okruženju. Radovi su po pozivu i svrstani su u tri sekcije:* Menadžment procesa u poštanskom i telekomunikacionom saobraćaju,* Poštanski saobraćaj, mreže i servisi,* Telekomunikacioni saobraćaj, mreže i servisi.Sekcija Menadžment poslovnih procesa u poštanskom i telekomunikacionom saobraćaju obuhvata aktuelna istraživanja i praktična rešenja koja odražavaju duboke transformacije u kojima se nalazi savremeni poštanski i telekomunikacioni sektor. Radovi u ovoj sekciji bave se ključnim temama kao što su digitalizacija, održivost, inkluzivnost, tehnološke inovacije i novi modeli upravljanja. Posebna pažnja posvećena je ulozi javnoprivatnih partnerstava, primeni ESG standarda, zaštiti korisnika, razvoju e-usluga i modernizaciji operacija zasnovanih na IoT tehnologijama. Kroz različite studije slučaja i analitičke pristupe, radovi ističu potrebu za organizacionom rekonfiguracijom poštanskih operatora, razvojem inkluzivnih servisa i unapređenjem kvaliteta korisničkog iskustva. Ova sekcija pruža sveobuhvatan uvid u izazove i mogućnosti koje oblikuju budućnost poštanskog i telekomunikacionog sistema, naglašavajući važnost strateškog menadžmenta u procesu digitalne i zelene transformacije.Sekcija Poštanski saobraćaj, mreže i servisi sadrži radove koji sa naučnog i stručnog aspekta analiziraju poštanski sektor i pripadajuće aktuelnosti. Autori radova, između ostalog, istražuju strateške pravce razvoja poštanskog saobraćaja, zatim modele primene savremenih informacionih tehnologija za optimizaciju kako tehnološkog procesa, tako iVI regulative. Teme od interesa odnose se na održivost poslovanja poštanskih operatora, sa posebnim akcentom na unapređenje dostave. Kvalitet univerzalne poštanske usluge i proces standardizacije u poštanskom saobraćaju su neki od ključnih izazova. Takođe, predmet interesovanja u ovoj sekciji je primena savremenih tehnoloških rešenja u poštanskoj logistici. Pored toga, autori predlažu primenu odgovarajućih metoda višekriterijumske analize za rangiranje sistema za preradu paketskih pošiljaka.Radovi u sekciji Telekomunikacioni saobraćaj, mreže i servisi posvećeni su aktuelnim dostignućima u razvoju...

Transitioning to Software-Defined Wide Area Network (SD-WAN) as an improved solution for companies aiming to achieve continuous and reliable Internet connectivity, along with cost-efficiency and improved performance and agility, introduces many benefits for business customers, but also puts pressure on service providers to provide this option. Operators may be reluctant to engage in this endeavor due to uncertainty with additional resources needed. This paper demonstrates how Value Stream Mapping (VSM) and Value Stream Analysis (VSA) methods can be applied to evaluate and improve sales operations of SD-WAN service to business customers. Our research is based on real-world applications and focuses on the practical implications of the VSM approach to optimize the SD-WAN service provision of a regional telecommunication operator. Current and future value stream maps are developed for the selected “family of services”. Based on the results, the improvement plan is outlined in three major groups of activities: technical feasibility checks, contracting, and delivering the contracted service. With the application of VSA, we were able to reduce the lead time of the cycle by 17%. For the first time, VSM is used here to improve the SD-WAN service in the domain of sales. The activities detected in the VSM that add value are further divided into three groups. This division allows for a more detailed analysis of the activities based on their value to the customer.

In this paper, we consider the problem of minimising the cost of data transmission as a function of the capacity of telecommunication links. To solve this problem, we first formulated a mathematical model, and then we designed and developed a software that enables the optimisation of the given or randomly generated telecommunications network. Declarative programming is a good choice for optimisation problems because it is enough to specify only the relations that must be satisfied, without giving any effective procedure for finding the values for the decision variables. To test the application, we developed a software that randomly generates a telecommunications network that meets the given requirements. This enables us to test the application on an arbitrary number of different telecommunication networks with different numbers of nodes and links, and analyse the impact of changing network parameters on the flow and results of the optimisation. As telecommunications networks operate in conditions of uncertainty, the subject of special analysis was the potential failure of some of the network links. The paper presents and thoroughly analyses the optimisation results for several selected networks, as well as summary results for a number of telecommunications networks.

Although known for years, the problem of meeting network traffic demand in multiservice environment is still recognized as one of the most significant challenges, regardless of the constant increase in network infrastructure capacity. One of the most important causes of this problem is the bursty nature of network traffic that could reflect on the network efficiency reduction due to temporal congestion of network resources. In this way, the operational characteristics of certain business systems as well as the quality of residential internet/iptv services could be compromised. One of the standard approaches to solving such a kind of problems is related to the concept of traffic management that includes 1) Traffic Policing techniques, as well as 2) Traffic Shaping techniques. Although these techniques share the same conceptual basis, these techniques also have significant differences, due to which they achieve different effects on network traffic. The importance of Traffic Shaping techniques arise with their potential to manage the traffic quality in modern network forms, such as Internet of Things (IoT) sensor networks. This paper explains the basic concept of traffic shaping, available algorithms on which traffic shaping techniques are based and provides a comparison with Traffic Policing techniques.

The Forthy-First Symposium on New Technologies in Postal and Telecommunications Traffic (PosTel 2023) is scheduled for November 28 and 29, 2023. The symposium is organized by the Department of Postal and Telecommunication Traffic of the Faculty of Transport and Traffic Engineering at the University of Belgrade. The co-organizers are: a state-owned enterprise, "Post of Serbia," "Telekom Srbija," and the Regulatory Agency for Electronic Communications and Postal Services (RATEL). The symposium is supported by the Ministry of Education, Science, and Technological Development and the Ministry of Trade, Tourism, and Telecommunications of the Republic of Serbia. Zbornik radova XLI Simpozijuma o novim tehnologijama u poštanskom i telekomunikacionom saobraćaju PosTel 2023, sadrži rezultate istraživanja iz oblasti poštanskog i telekomunikacionog saobraćaja u proteklom jednogodišnjem periodu. Organizator Simpozijuma je Odsek za poštanski i telekomunikacioni saobraćaj Saobraćajnog fakulteta u Beogradu. Suorganizatori su: JP ″Pošta Srbije″, ″Telekom Srbija″ a.d. i Regulatorno telo za elektronske komunikacije i poštanske usluge – RATEL. Pokrovitelji su: Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije i Ministarstvo informisanja i telekomunikacija Republike Srbije. Tematika Simpozijuma vezana je za aktuelna istraživanja u oblastima od posebnog značaja za poštanski i telekomunikacioni saobraćaj, kod nas i u okruženju. Radovi su po pozivu i svrstani su u tri sekcije: - Menadžment procesa u poštanskom i telekomunikacionom saobraćaju, - Poštanski saobraćaj, mreže i servisi, - Telekomunikacioni saobraćaj, mreže i servisi.