Tomas Kovacik

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.

Towards novel HBB application platform: Experimental testbed

In this paper, we describe laboratory deployment of HBB-Next featured environment. Based on existing standards of Hybrid Broadband Broadcast TV we deploy laboratory environment along with new applications enabling personalization of content and multimodal interface. The environment consists of three parts - DVB-T broadcasting and receiving testbed, broadcasting system used for enriching education process and front end HBB-Next system enabling personalization features and multimodal interface of hybrid television.

Syn Flood Attack Detection and Type Distinguishing Mechanism Based on Counting Bloom Filter

Presented work focuses onto proposal, implementation and evaluation of the new method for detection and type identification of SYN flood (DoS) attacks. The method allows distinguishing type of detected SYN flood attacks – random, subnet or fixed. Based on Counting Bloom filter, the attack detection and identification algorithm is proposed, implemented and evaluated in KaTaLyzer network traffic monitoring tool. Proof of correctness of the approach for TCP SYN flood attack detection and type identification is provided – both in practical and theoretical manners. In practice, new module for KaTaLyzer is implemented and TCP attacks are detected, identified and network administrator is notified about them in real-time.

Traffic Characterization in IP Multimedia Subsystem

This article focuses on the network traffic measurement inside of IMS, its analysis, evaluation of its statistical properties and proposing a model of IMS traffic. We chose KaTaLyzer as a network traffic measurement software and propose network traffic models for modelling traffic in IMS.

Enhanced hybrid TV platform with multiscreen, advanced EPG and recommendation enablers

Abstract TV watching dramatically changes with introduction of new technologies such as Internet-connected TVs, enriched digital broadcasting (DVB), on-demand content, additional programme information, mobile phones and tablets enabling multiscreen functions etc that offer added values to content consumers. In this paper we propose modular advanced TV platform and its enablers enhancing TV watching. They allow users to receive aside of EPG also additional information about broadcasted content, to be reminded of requested programme, to utilize recommendation and search features, thanks to multiscreen functionality to allow users to take watched content with them or transfer it onto another device. The modularity of the platform allows new features to be added in future.

IP Data Delivery in HBB-Next Network Architecture

Digital television enables IP data delivery using various protocols. Hybrid television HbbTV enhances digital television with applications delivery. HBB-Next is an architecture which enhances HbbTV with additional features. However it does not specify IP data delivery despite it has access to both broadcast and broadband channel. This paper proposes architecture and protocols for IP data delivery in HBB-Next. To achieve this goal we designed new node (Application Data Handler - ADH) in HBB-Next architecture and new communication protocols (Application Data Handler Control Protocol - ADHCP, and Hybrid Encapsulation Protocol - HEP) for data transmission. We created Stochastic Petri Net (SPN) model of designed protocols and implemented them in ns2 network simulator to verify our solution. Results of SPN model simulation and ns2 network simulation are discussed and HEP protocol is compared to existing encapsulation protocols used in DVB systems.

Wireless sensor networks for next generation networks and HBB-Next architecture

In this paper, we focus on interconnection of wireless sensor networks and Next Generation Network environments in order to bring new advanced architecture. It focuses onto bringing monitoring of environment as an IMS service available to any IMS user. Cooperation of sensor network and Hbb-Next architecture is also proposed in order to utilize possibilities of new hybrid television architecture and services it provides.

Service sharing among IMS domains

Novel approach to service delivery and its proof of concept is presented. Service Sharing System (SSS) is based on advantages of IP Multimedia Subsystem (IMS) which is next generation communication system architecture oriented on services. Proposed SSS introduces sharing multimedia services among telco operators and providing 3rd party services to the customers via extension of the application layer. SSS is based on information exchange among service provider, customer and his operator using SIP protocol. The adoption of SSS leads to increased satisfaction of customers and profit of operators and service providers.

Interoperability among Different IMS Cores

The IMS as core for operators’ network is imminent. However, the interconnection is still an issue on basic call layer, but also on services layer. In this article, we present the NetLab project approach, which has the aim to create a testing environment for research and development of new services and applications based on the IP Multimedia Subsystem (IMS). The results of interconnection tests between several IMS platforms are also provided here.