A wavelength-routed optical network consists of a number of cross-connects which are interconnected by optical fibers. Transparent optical networks allow signals to bypass extensive electronic signal processing at intermediate nodes. The quality of an optical signal degrades as it travels though several optical components along its lightpath. It is essential to incorporate imapact of the physical impairments in the routing and wavelength assignment (RWA) problem in transparent optical networks. This work compiles a comprehensive survey, from various research publications, of the proposed algorithms that address this issue. The physical layer impairments classification in optical networks are initially presented followed by physical layer impairments (PLI) RWA algorithms and algorithmic approaches for the PLI-RWA problem. Performance metrics for evaluating the performance of the proposed PLI-RWA algorithms are presented at the end of the work. Further research topics are presented in this study.

Software-defined network (SDN)/OpenFlow research and development have attracted the attention of many researchers and companies. The key idea of an SDN is characterized by decoupling the control plane from the data plane. This paper surveys the state-of-the-art of SDN and latest developments in this active research area of SDN. This work also compiles a comprehensive survey of programmable networks from early ideas to recent developments. SDN architecture and the OpenFlow standard in particular are initially presented followed by current alternatives for implementation and SDN protocols and services. It is also discussed why OpenFlow/SDN can succeed where Generalized Multi-Protocol Label Switching (GMPLS) failed in terms of optimal strategy transition from GMPLS control plane for optical multilayer networks to SDN control plane. At the end of the work are presented SDN applications and further research topics with some suggested open research challenges.

Planning, building and optimization process of radio access networks is a complex dynamical activity, which requires a lot of planning effort and time. The final goal is to build a radio network, which consists of minimum infrastructural components, and offers the best coverage and service quality. In order to consider all the possibilities of GSM signal coverage during planning time, and before the installation of equipment on certain location, it is very important to do software simulation of the GSM signal coverage of the observed area. Consequently, it is important to use an optimal predictive model which, using the appropriate digital maps, will offer the most realistic picture of the future radio access network. Taking this into account, subsequent optimization process and re-analysis would be reduced to a minimum. In this paper, comparative analysis of the software prediction GSM coverage area signal with the results obtained by measurements after the implementation of planned radio infrastructure at the proposed base station, will be presented. In order to assess the credibility of the software predicted GSM signal coverage area, measurements of GSM signal in urban area were performed. Final results were verified using statistical nonparametric chi square test. Further, the software prediction relation in regard to the measurement signal after the implementation of system is defined, and potential causes are treated.

In order to perform a simulative evaluation of the Hierarchical Mobile IPv6 protocol (HMIPv6) OMNeT++ simulation environment was used. OMNeT++ simulation package - INET framework and xMIPv6 was enhanced with an extension for HMIPv6, which includes Neighbor Discovery protocol, IPv6 router and the implementation of a Mobility Anchor Point (MAP). The simulation model was implemented as defined in RFC 5380 Hierarchical Mobile IPv6 - HMIPv6 Mobility Management. Enhancements are recognized in terms of an upgraded Router advertisement (RA) packet with option data about the MAP. We used dynamic MAP discovery, based on MAP option propagation in Router Advertisements from the MAP to the Mobile Node through certain (configured) router interfaces, within the routers in a network.

The rapid growth of connected devices worldwide has dramatically increased demand for available spectrum. The changeover to spectrum efficient digital terrestrial TV transmission freed up large blocks of spectrum. This paper aims to offer the results of the analysis of 3G mobile network usage in terms of traffic based on the case of dominant mobile operator in Bosnia and Herzegovina (B&H). By this it is identified whether the demand for more radio spectrum is legitimate. In order to satisfy the requirement for extension of radio spectrum aimed for broadband services the broadcast spectrum (470 - 700 MHz) has been investigated. The rest of the UHF broadcast band (700 - 860 MHz) was not considered since it is specified as the Digital Dividend and hence was not a subject of dynamic access to the spectrum investigation. All results have been compared to the relevant researches conducted in some European, US, Asian and African countries. Ultimately the analysis results would help the modernization and enhancement of spectrum management proposing the concept of spectrum sharing and dynamic spectrum access to the national regulatory authority in B&H.

This paper considers estimation of QoE (Quality of experience), which depends on QoS (Quality of Service) and correlates with it, as well as monitors QoS parameters in lower OSI layers. It also suggests a model that evaluates QoE in different time intervals during consuming of IPTV service under strong influence of non-stationary noise in OFDM (Orthogonal Frequency-Division Multiplexing) modulation scheme.

We have witnessed the rapid progress of information technology and the rapid penetration of the large number of services worldwide. Users can use OTT services on any device, regardless of the network access. For the purpose of using the various devices developed applications provide easy access to tailored device on which the application is installed. This paper explains the concept of OTT services as well as traditional operator's response to OTT challenges. An analysis for the world market and analysis of the market of Bosnia and Herzegovina is given. Also, a brief overview of the OTT services regulation is given.

Cloud computing delivers computational and communicational capabilities via the Internet. From processing and storing information and applications, to being able to access it from anywhere and at any time, cloud computing represents a breakthrough concerning how people and companies work and communicate through the Internet. In the last five years, cloud computing has a constant increase in its all aspects. With development of ICT technologies (on global level), limitations in providing cloud service does not exist anymore and market cannot be considered at the local level. Global picture and offer of cloud services which comes from global cloud service providers need to be considered. In this paper, the situation in Bosnia and Herzegovina in terms of Cloud computing is presented.

One of the weaknesses of a GSM network is a lack of two-way authentication. For years, this weakness has been abused using IMSI catcher. However, due to high prices there were no major opportunities for detailed IMSI catcher analysis and for a practical implementation of the IMSI catcher with lower costs and greater availability. Development of a software defined radio has enabled a cheaper implementation. In this paper, the implementation of open-source IMSI catcher using USRP device is presented. Also, it describes security attack based on sending malicious SMS to multiple mobile users.

The basic functionalities of mobile network (voice service and mobility) do not satisfy all user requirements in the network. Thus the evolution of GSM was inevitable, as well as the emergence of user-oriented services. In this paper, implementation of a web service using USRP hardware device combined with OpenBTS software is described and analyzed.