Ivan Kotuliak

NGN platform architecture and its adaptation to the evolution trends

-The evolution strategy of NGN laboratory towards the converged networks based on IP multimedia subsystem (IMS) as trends and aims for implementation of converged NGN network is presented in the article. This article describes actual implementation of NGN laboratory and future planned extensions and integration work for incorporating IMS core elements to our laboratory as unified service control subsystem. Existing NGN solution includes applications and our experiences with integrations of applications and their usability.

Utilizing OpenFlow, SDN and NFV in GPRS Core Network

Since GPRS introduction, mobile networks had gone a long way, however GPRS with its EDGE enhancement is still widely used, but the architecture proves to be outdated, complex and often hard to integrate with other technologies. With the introduction of new networking approaches such as SDN and NFV, many problems regarding GPRS emerge. In this paper we present a new architecture for delivery of GPRS service which uses modern approaches such as SDN and NFV. This architecture simplifies the whole network by moving mobile network intelligence to the SDN controller, while removing old, complex nodes such as SGSN and GGSN and mobile protocols such as GTP. This brings the network flexibility, programmability, service elasticity and vendor independency. No changes on the radio access network or the mobile terminal are required to deploy our simplified GPRS architecture, so backward compatibility and interoperability is ensured. Proposed architecture was implemented and tested with real radio access network and mobile terminal.

Novel SDN multi-domain architecture

In this paper we propose a new architecture supporting communication between various Software Defined Networking (SDN) domains. This novel architecture provides inter-domain connection based on vendor neutral communication protocol using new modules for SDN controller. Motivation for this project is to facilitate deployment of SDN in a large scale network - i.e. the Internet and provide a way for controllers in different domains to cooperate in network traffic management. Result of this cooperation would enable service providers to offer and manage virtualised devices and services to end customers, thus lowering their OPEX and CAPEX.

WLAN power consumption analytical model

Efforts are underway in improving power conservation in WLAN devices and thus increasing the duration between recharging the battery. In order to evaluate the performance of new energy saving methods, there is a need for analytical tools. This paper proposes a simple analytical model that provides the average power consumption of a WLAN device. The proposed model is based on Markov models that provide throughput estimation. Our analytical model is compared to a network simulation. The error between the two is kept below 1% for a very wide number of cases.

WLAN power saving using packet overhearing reduction

The power consumption is important in wireless communication as many devices are battery powered. We focus on this area and propose a method to reduce WLAN device power consumption, particularly on WiFi according to standard 802.11. The proposed method defines a new PHY state that consumes less power than the active states but can switch back fast to an active state. The PHY switches to this state during part of an overheard packet. No change is required to the WLAN protocol or any other device in the network, allowing for full compatibility with the existing devices. The performance analysis is done both analytically and by simulation. It shows that it is possible to reduce average power consumption by up to 30 %.

HBB platform for e-learning improvement

In this paper, we focus on the HBB technology and its evolution towards HBB-Next and HBB 2.0 This platform can be used for development of integrated applications for variety of devices and allows us the wide and cheap distribution of educational content. Proposed solution can be used also in development countries with low Internet penetration or with prohibitive bandwidth prices.

Service availability enhancement in multimedia networks

IMS as promising NGN architecture has to deal also with service availability because of its importance to customers. Its service-oriented architecture enables easy deployment of our proposed Service Sharing System (SSS) which enhances availability of offered services and brings their categorization and browsing. While usual approach of operators is to build own networks and services, SSS allows operators to offer their customers variety of services in very short deployment time. Operators can offer services provided by their partners which means novel type of cooperation among operators on service level. SSS opens telecommunication services market which brings competition and more and high quality services. SSS is win-win solution for all involved parties.

Real-time traffic analysis in Ethernet

This article presents our framework intended for measurement of the Ethernet traffic, its evaluation and finally graphical representation. Whole project consists of three main parts network measurement, trace analysis and user interface.

Markovian performance analysis of a synchronous optical packet switch

Switch architectures applicable to fixed-length optical packet networks is studied and we compare their performance in terms of packet loss ratio. We propose analytical models of these switches (as discrete time Markov chains) and we compare their performance with those obtained by simulation, varying statistical properties of incoming traffic. We show that Markovian models of future optical architectures can be applied as a tool to studies of network design.

Enhancing security in mobile data networks through end user and core network cooperation

Smartphones, tablets and other mobile devices are quickly becoming a common part of our lives. With the popularity growth of these devices, the amount of mobile malware and other cyber-attacks rises. Many security solutions exist for various mobile platforms, however firewall functionality is missing in the majority of these applications. The reason is lack of network traffic filtration support in the most of modern mobile operating systems. This leaves the end user devices protected only by security infrastructure of the internet service provider. This paper proposes an enhanced security model and architecture, which enables network traffic filtration for devices without support of such feature in the operating system. It requires minimal changes in the existing infrastructure and allows multiple deployment scenarios. The usage of this architecture is not limited to mobile devices only, but can be used also in fixed networks.