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Evaluating the performance of distributed applications, such as mobile telephone or video conferencing devices, has become increasingly complex as the diversity of scenarios and data rates in networks increase. In this paper, we present the design and implementation of RplTrc, a network emulation tool. RplTrc uses traces to drive interceptions of the Linux protocol stack to delay, drop or duplicate...
In order to increase revenues, reduce operating costs and satisfy new user demands, network providers have to develop new approaches for their service provisioning operations. One of the possible solutions for this problem is utilization of intelligent software agents. In such a scenario, software agents act on behalf of the network provider while performing certain actions in competitive environment...
With the expected prevalence of IP-based wireless mobile communication networks, the provision of adequate mobility solutions becomes a key issue. The concept of network-based mobility management is currently being debated on by the Internet Engineering Task Force as a novel approach enabling mobility for user terminals which lack built-in mobility extensions. Such a concept provides an alternative...
This paper describes formal model of the MBMS (multimedia broadcast/multicast service) support in UMTS (universal mobile telecommunication system). The formal model is based on the reference architecture and implementation suggestion, which was proposed by 3GPP (third generation partnership project) specification TS23.246. The main goal was to build the formal model, which supports basic signalization...
Migrating to signaling system 7 over IP through Sigtran deployment is a cost-effective solution to replace traditional low speed SS7 signaling links with highly efficient IP connectivity. This paper deals with performance evaluation of the stream control transmission protocol which is the basis of the Sigtran protocol stack. We consider an MSC/VLR-HLR mobile network segment and develop an analytical...
Providing quality of service (QoS) and traffic engineering capabilities in the next generation multi-service networks is essential, especially to support the requirements of real-time applications. multi-protocol label switching (MPLS) is rapidly emerging technology, which plays a key role in next generation networks by delivering QoS and traffic engineering features. MPLS dramatically improves the...
In this paper we propose a system for invoice amount prediction. The approach we applied is based on ensemble methods integrating information from many models predicting customer's invoice amount. Results generated by different models can be decomposed into constructive and destructive components. The elimination of the destructive ones should improve final results. After basis components are estimated...
In this paper, we present throughput analysis of two popular Mobile Ad hoc NETwork (MANET) routing protocol implementations, AODV-UU (Uppsala University) and DSR-UU. Both implementations are Linux based user space implementations developed using C language. Instead of using simulator for throughput analysis, the investigated scenario involves a stationary test-bed that consists of real wireless nodes...
Summary form only given. Bringing TV experience to the mobile users opens up a new era in the evolution of the mobile systems. Even if it started as a mere copying of the linear TV distribution of today, the mobile systems technologies that can provide feedback channels from every user enable new ways of enhancing the TV experience. So besides just watching TV via broadcast or on demand, a whole myriad...
This paper presents deductive programming for scheduling scenario generation. Modeling for solution is achieved through program transformations. First, declarative model for scheduling problem domain is introduced. After that model is interpreted as scheduling domain language and as predicate transition Petri net. Generated reachability tree presents search space with solutions. At the end results...
Nowadays mobile communications gain more and more importance. The increased usage requires more sophisticated services. In this paper a possible, future network architecture is examined, called BIONETS. In this case the mobile nodes for the entire network, without dedicated backbone is present. We pursue the goal of finding an optimal information dissemination model over some mobility model. The investigation...
Modern technologies allow storage of large amounts of raw data which invariably contains usable information not yet discovered. Machine learning and data mining give us techniques which can be used to analyze that data and uncover previously unknown rules and associations, hidden knowledge which once acquired -and properly interpreted -can be used in multitude of ways. Even though data mining has...
A new electronic service code is introduced, in contrast with the electronic product code in order to activate RFID contents based services rather than recent supply chain oriented management services. This paper defines and describes the new electronic service code tag data, including how it is encoded on the UHF Class 1 Generation 2 tag. The electronic service code easily support backward comparable...
Database migration is the process of upgrading database management system to a more current release. There are situations when the regular migration method cannot be used. Problems occur when a large amounts of data needs to be transferred from one system to the target system, when there is a big release difference between them and when time is limiting factor. In that case an alternative method must...
This paper introduces a novel, resource-semantic approach to designing site structure for Web applications. In this approach, every resource constituting the site is assigned a specific, distinct semantics called identity, and an identifier in form of URI which expresses this identity as a user-readable string. Identity is connected to concepts in Web application domain; it is constructed and manipulated...
A Web-based design and control system has been investigated for regional optical IP (Internet protocol) networks. The system can design lightpaths connecting nodes such that given traffic is groomed with minimum number of wavelengths, or give a reserve design with additional lightpaths to groom future traffic. Reconfigurable optical add/drop multiplexers (R-OADMs) were also investigated and manufactured...
The evolution of optical network devices such as optical cross-connects and optical amplifiers has provided a huge increase in the transmission capacity of optical links. However, this evolution also brings problems such as the large power imbalance arising with the transmission of several wavelengths that imposes a severe degradation to the optical signal. Recent research work shows how to adapt...
The advancement of traffic makes world more and more internationalized and increases frequency of communication between people who come from different cultures. Differences in their conversation go beyond the languages they speak to the non-verbal behaviors they express while talking. To improve the abilities of the embodied conversational agents (ECAs) while interacting with human users we are working...
A novel optical switch architecture comprising internal ring-like fiber interconnections is presented and discussed in this paper. The architecture allows optical packet and burst switching as well as multicasting directly in the optical domain by copying and forwarding of packets and bursts without wavelength conversion. We expect a reduction of packet/burst discard probability due to the ability...
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