Preface

Abstract

The growth of today's telecommunications induces wide spectrum of obstacles on various layers, from management of large networks with thousands of nodes to physical aspects that touch singular links. The current issue of Journal of Telecommunications and Information Technology brings a set of eleven articles that cover just such a broad range of problems. 
The first four papers focus on issues related with network-operator level. To begin with, the article Traffic Engineering in Software Defined Networks: A Survey by M. R. Abbasi, A. Guleria, and M. S. Devi gives an overview over traffic engineering methods, which are intended to optimize a network and improve network robustness. In addition to classic techniques, the authors present the state of the art in traffic engineering solutions proposed for novel network architecture, which is Software Defined Networking (SDN). They also highlight the research challenges and future directions for SDN-based traffic engineering. (...)