Márton Bérces

Novel Information Dissemination Solutions in Biologically Inspired Networks

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 covers our previously defined protocol called IOBIO, classical broadcast and a newly developed adaptive broadcast algorithm. We run several simulations-with an own simulator created in OMNeT++ in order to decide which one is the optimal information dissemination method for the given mobility environment. The results give us the advantage to further improve the communication in such networks.

Overhead reducing information dissemination strategies for opportunistic communications

We examined the efficiency of information dissemination assuming a disconnected network architecture where highly mobile nodes form the network. The nodes have different limitations, like short battery life and low computing capabilities. We created IOBIO and MIOBIO, two protocols for information dissemination in this environment. In this article we present the results of several simulations - with a simulator created in OMNeT++ to analyze opportunistic communications - to compare the performance of the two information dissemination methods for a given mobility environment. The results give us an insight how to decrease the cost of communication in such networks.

Natural selection of message forwarding algorithms in Multihop wireless networks

The need for self-managing Multihop MANETs (Mobile Ad Hoc Networks) arose recently, where the network rapidly adapts to the changes of the environment without any central control. One of the challenges is how to spread the information fast and resource-effectively in the network. This paper presents a novel adaptive framework, which utilizes natural selection for choosing the adequate message forwarding algorithms for changing environments. The survival of the competing algorithms depends on their efficiency, while the fitness evaluation is made locally without overhead generating performance feedback. Performance evaluations were carried out in our simulation platform tailored to a self-managing MANET environment, to analyze the performance measures of different message forwarding algorithms.

Strategies for reducing information dissemination overhead in disconnected networks

The information dissemination was examined in a special disconnected network architecture where the moving nodes form the network. The nodes have certain kind of limitations, in terms of battery and computing capabilities. We created APF and IOBIO, two protocols for information dissemination in this environment. In this article we present the results of several simulations - run in a simulator created in OMNeT++ -to decide which information dissemination method is optimal for a given mobility environment. The results give us information to further improve the communication in such networks.

Modeling Medium Access Control (MAC) by Quantum Methods

Medium access control (MAC) is an important part of wireless telecommunication systems. The main goal of a MAC protocol is to provide the best usage of the common resources for the users. One of these resources is typically the communication channel. By quantum informatics and computation - that gain more and more attention - some calculations and algorithms may become more efficient. The possible implementation of a quantum based system would lead us to great benefits, by applying it to an already existing problem. We give a model for medium access control via quantum methods

On the interoperability problems of the spatiotemporal relational model, PLAT

Since there are already tools for implementing and managing spatiotemporal data, it is worth elaborating methods for solving interoperability problems. In this paper a spatiotemporal model, PLAT is investigated from this point of view. We describe algorithms for translating PLAT into other spatiotemporal models. It is also shown that the necessary topological information for building the PLA- or PLAT-Model can be extracted from other constraint and spatiotemporal models. These methods are useful in cases where topological properties have to be discovered, since very fast algorithms are developed in the PLA-Model

Energy Efficient Configuration of Dual RAT Cellular Networks in Homogenous Environment

Energy efficiency is getting more and more emphasis in our everyday life. Wireless cellular networks use a lot of power and lately there have been intentions to create more efficient systems and so reduce the amount of consumed energy. In this paper we investigate the energy efficiency of single and dual RAT (Radio Access Technology) cellular networks. The proposed calculation scheme can be used to maintain the required throughput/capacity of the network with the least energy usage possible or to maximize the capacity with the given available energy. We present certain scenarios in which dual RAT systems perform better than single RAT ones. Guidelines on how to set network parameters are also given to achieve optimal performance.

Extension and analysis of modified superdense-coding in multi-user environment

Modified superdense coding for quantum systems was introduced for two communicating parties. In this paper the algorithm is extended to n parties. Beside the generalization, an analytical approach is also presented to show the performance of the algorithm, along with the comparison of slotted ALOHA systems.

A Quantum Theory Based Medium Access Control for Wireless Networks

Medium Access Control (MAC) is an important part of wireless telecommunication systems. The main goal of a MAC protocol is to provide the best usage of the common resources for the users. One of these resources is typically the communication channel. By quantum informatics and computation—that gain more and more attention—some calculations and algorithms may become more efficient. The possible implementation of a quantum based system would lead us to great benefits, by applying it to an already existing problem. In this paper we give a model for medium access control via quantum methods.