— Nowadays, with the development of next generation networks, new standards for voice and video services have been introduced, and VoIP ( Voice over IP ) has become a very popular protocol. It leads to the convergence of networks which provide voice and data transfer services with enhanced and improved applications for customers. As a key element of the next generation networks, IMS ( IP Multimedia Subsystem ) architecture aims to offer multimedia services via fixed-mobile convergent solutions. In this paper, a work model offering triple play services via a UMTS network and an IMS subsystem is realized. This model is realized through an Open Source software solution for an IMS subsystem, and the success of the triple play service provided by this system is analyzed. Testing of access networks and of different codecs using an Open IMS Core system and a UMTS access network is carried out. The most successful codec is determined and proposed for use while offering triple play services. Further, an optimization of the UMTS radio-access network of a middle size operator is done by planning the optimal number of NodeB’s for this software solution and the dimensioning and optimization of the same. The conclusion is that, from the standpoint of offering triple play services to a certain number of users, no significant extensions of the radio network capacity are needed. The resulting system for offering triple play services is functional and optimized for exploitation in an active network with high reliability.

This paper presents multicast problems for the Internet Protocol Multimedia Subsystem (IMS) based on the Internet Protocol Television (IPTV) and offers one approach to overcoming them. Presented and addressed are multicast advantages and problems, problems of applying multicast on IMS and bandwidth problem for unicast. At the end, it is safe to conclude that unicast appears to be more appropriate for the IMS-based IPTV.

In this work, the strategy for correction of bits using Soft Input Decryption is analyzed. Soft Input Decryption is used for correction of cryptographic check values, which are very fragile when they are transmitted over noisy channels: only one wrong bit at input of the decryptor causes about 50% of errors at output of the decryptor. Soft Input Decryption corrects incorrect bits of cryptographic check values in most of cases using combination of SISO channel decoding and decrypting. Soft Input Decryption is an iterative process and therefore it is needed to minimize duration of iterations. This paper suggests an algorithm for optimization of Soft Input Decryption, which enables restriction of needed computing time of the Soft Input Decryption algorithm. Suggested optimization is performed for ECDSA digital signatures.

The paper focuses on the implementation of WiMAX in Bosnia and Herzegovina (BiH). A brief overview of the regulatory and legislative framework for the service implementation is given. It encompasses review of present characteristics of telecommunications market in Bosnia and Herzegovina.

The paper focuses on the telecommunications sector in Bosnia and Herzegovina providing a brief overview of the regulatory and legislative framework, as well as achieved level of development of several segments of the telecommunications market, particularly highlighting the market of mobile telecommunications. Since 2001 the policy actions have contributed to the mobile penetration rise from 15% in 2001 to almost 60% in 2007.