Physica A: Statistical Mechanics and its Applications, 2015
ABSTRACT The communication infrastructure is a critical component of a large-scale cloud data cen... more ABSTRACT The communication infrastructure is a critical component of a large-scale cloud data center. It needs to provide the best performance available while keeping overprovisioning and, lately even more important, power consumption, to the minimum. Aiming to provide a unified solution that will have high performance together with economical benefits and power consumption reduction, in this paper, we propose a new community-based scale-free model for data center network architecture. By comparing the proposed model to other similar solutions we show that the performance of the network in terms of average path length, bandwidth and resilience is similar to the state-of-the-art models. In our presented detailed analysis of the model properties, our focus is set on exploring how heterogeneity in terms of different type of network equipment influences the basic network properties. We also present solutions and network metrics that can be used in conjunction to the introduced community structure in order to additionally increase the performance.
In this paper we present a general technique for parallelizing regular algorithms with the tools ... more In this paper we present a general technique for parallelizing regular algorithms with the tools the Hadoop ecosystem offers: MapReduce, HDFS, HBase and Pig. This framework can be applied for parallelizing algorithms for feature selection, clustering, machine learning etc. It consists of several steps: load the datasets in HDFS, apply some transformations if they are needed, store the datasets in HBase, and implement the algorithm in Pig with the help of User Defined Functions.
This paper presents the concept of Open Cloud eXchange (OCX) that has been proposed by the GN3plu... more This paper presents the concept of Open Cloud eXchange (OCX) that has been proposed by the GN3plus JRA1 activity to bridge the gap between two major components of the cloud services provisioning infrastructure: Cloud Service Provider (CSP) infrastructure; and cloud services delivery infrastructure which in many cases requires dedicated local infrastructure and quality of services that cannot be delivered by the public Internet infrastructure. In both cases there is a need for interconnecting the CSP infrastructure and local access network infrastructure, in particular, to solve the "last mile" problem in delivering cloud services to customer locations and individual (end-)users. The OCX remains neutral to actual cloud services provisioning and limits its services to Layer 0 through Layer 2 to remain transparent to current cloud services model. The proposed OCX concept will leverage the existing Internet eXchange (IX) and GLIF Open Lightpath Exchange (GOLE) solutions and pr...
Advances in Intelligent Systems and Computing, 2013
ABSTRACT Having in mind the vast amount of IP-enabled devices that are activated each day, it is ... more ABSTRACT Having in mind the vast amount of IP-enabled devices that are activated each day, it is clear that the deployment of IPv6 is a must. Many companies have already implemented some sort of IPv6 networks, but implementation of IPv6 is not a small task. One cannot just switch from IPv4 to IPv6. There are several strategies and different deployment models involved in the process, and there is no “one size fits all” solution. However, there are some methods that are more recommended than others. In this paper, we give an overview of the IPv6 transition mechanisms and their deployment in a specific case study. Our aim is to investigate the pros and cons of the transition mechanisms and decide on the best solution to the given problem.
ABSTRACT In this work, we conduct a research on the effects of the details of the terrain on the ... more ABSTRACT In this work, we conduct a research on the effects of the details of the terrain on the path establishment in wireless networks. We discuss how the terrain induced variations, that are unavoidably caused by the obstructions and irregularities in the surroundings of the transmitting and the receiving antennas, have two distinct effects on the network. Firstly, they reduce the amount of links in the network connectivity graph causing it to behave more randomly, while decreasing the coverage and capacity of the network. Secondly, they increase the length of the established paths between the nodes. The presented results show how the terrain oblique influences the layout of the network connectivity graph, in terms of different network metrics, and gives insight to the appropriate level of details needed to describe the terrain in order to obtain results that will be satisfyingly accurate.
ABSTRACT The proliferation of smartphones and the demand for all-day connectivity has brought exp... more ABSTRACT The proliferation of smartphones and the demand for all-day connectivity has brought exponential growth of global mobile data traffic. To survive the explosive progression and best serve their customers, mobile network operators need to have a better understanding of the nature of traffic carried by cellular networks. Understanding the characteristics of this traffic is important for network design, traffic modelling, resource planning, and network control. In this work we investigate the basic characteristics of smartphone traffic, identifying and understanding the impact of context (location, time, physical interface) on smartphone usage for calls, messages and data traffic. In order to identify and characterize patterns in the user traffic generated by smartphone devices in the mobile networks, we employ naturalistic logging methodology based on non-obtrusive background data collection while aiming for a highly diverse study participants backdrop. Our statistical results present a comprehensive analysis on user habits while using their smartphones on a daily or weekly basis. By taking advantage of the gathered user logs and the statistical analysis of the traffic characteristics, we attempt to design a mobile traffic generator that will create synthetic voice, message and data traffic according to the observed real life traffic characteristics. The generated mobile traffic scenarios can be used not only for modelling the mobile operators’ network (such as 3G and 4G), but also WiFi, mobile ad hoc and sensor networks.
Physica A: Statistical Mechanics and its Applications, 2015
ABSTRACT The communication infrastructure is a critical component of a large-scale cloud data cen... more ABSTRACT The communication infrastructure is a critical component of a large-scale cloud data center. It needs to provide the best performance available while keeping overprovisioning and, lately even more important, power consumption, to the minimum. Aiming to provide a unified solution that will have high performance together with economical benefits and power consumption reduction, in this paper, we propose a new community-based scale-free model for data center network architecture. By comparing the proposed model to other similar solutions we show that the performance of the network in terms of average path length, bandwidth and resilience is similar to the state-of-the-art models. In our presented detailed analysis of the model properties, our focus is set on exploring how heterogeneity in terms of different type of network equipment influences the basic network properties. We also present solutions and network metrics that can be used in conjunction to the introduced community structure in order to additionally increase the performance.
In this paper we present a general technique for parallelizing regular algorithms with the tools ... more In this paper we present a general technique for parallelizing regular algorithms with the tools the Hadoop ecosystem offers: MapReduce, HDFS, HBase and Pig. This framework can be applied for parallelizing algorithms for feature selection, clustering, machine learning etc. It consists of several steps: load the datasets in HDFS, apply some transformations if they are needed, store the datasets in HBase, and implement the algorithm in Pig with the help of User Defined Functions.
This paper presents the concept of Open Cloud eXchange (OCX) that has been proposed by the GN3plu... more This paper presents the concept of Open Cloud eXchange (OCX) that has been proposed by the GN3plus JRA1 activity to bridge the gap between two major components of the cloud services provisioning infrastructure: Cloud Service Provider (CSP) infrastructure; and cloud services delivery infrastructure which in many cases requires dedicated local infrastructure and quality of services that cannot be delivered by the public Internet infrastructure. In both cases there is a need for interconnecting the CSP infrastructure and local access network infrastructure, in particular, to solve the "last mile" problem in delivering cloud services to customer locations and individual (end-)users. The OCX remains neutral to actual cloud services provisioning and limits its services to Layer 0 through Layer 2 to remain transparent to current cloud services model. The proposed OCX concept will leverage the existing Internet eXchange (IX) and GLIF Open Lightpath Exchange (GOLE) solutions and pr...
Advances in Intelligent Systems and Computing, 2013
ABSTRACT Having in mind the vast amount of IP-enabled devices that are activated each day, it is ... more ABSTRACT Having in mind the vast amount of IP-enabled devices that are activated each day, it is clear that the deployment of IPv6 is a must. Many companies have already implemented some sort of IPv6 networks, but implementation of IPv6 is not a small task. One cannot just switch from IPv4 to IPv6. There are several strategies and different deployment models involved in the process, and there is no “one size fits all” solution. However, there are some methods that are more recommended than others. In this paper, we give an overview of the IPv6 transition mechanisms and their deployment in a specific case study. Our aim is to investigate the pros and cons of the transition mechanisms and decide on the best solution to the given problem.
ABSTRACT In this work, we conduct a research on the effects of the details of the terrain on the ... more ABSTRACT In this work, we conduct a research on the effects of the details of the terrain on the path establishment in wireless networks. We discuss how the terrain induced variations, that are unavoidably caused by the obstructions and irregularities in the surroundings of the transmitting and the receiving antennas, have two distinct effects on the network. Firstly, they reduce the amount of links in the network connectivity graph causing it to behave more randomly, while decreasing the coverage and capacity of the network. Secondly, they increase the length of the established paths between the nodes. The presented results show how the terrain oblique influences the layout of the network connectivity graph, in terms of different network metrics, and gives insight to the appropriate level of details needed to describe the terrain in order to obtain results that will be satisfyingly accurate.
ABSTRACT The proliferation of smartphones and the demand for all-day connectivity has brought exp... more ABSTRACT The proliferation of smartphones and the demand for all-day connectivity has brought exponential growth of global mobile data traffic. To survive the explosive progression and best serve their customers, mobile network operators need to have a better understanding of the nature of traffic carried by cellular networks. Understanding the characteristics of this traffic is important for network design, traffic modelling, resource planning, and network control. In this work we investigate the basic characteristics of smartphone traffic, identifying and understanding the impact of context (location, time, physical interface) on smartphone usage for calls, messages and data traffic. In order to identify and characterize patterns in the user traffic generated by smartphone devices in the mobile networks, we employ naturalistic logging methodology based on non-obtrusive background data collection while aiming for a highly diverse study participants backdrop. Our statistical results present a comprehensive analysis on user habits while using their smartphones on a daily or weekly basis. By taking advantage of the gathered user logs and the statistical analysis of the traffic characteristics, we attempt to design a mobile traffic generator that will create synthetic voice, message and data traffic according to the observed real life traffic characteristics. The generated mobile traffic scenarios can be used not only for modelling the mobile operators’ network (such as 3G and 4G), but also WiFi, mobile ad hoc and sensor networks.
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Papers by Sonja Filiposka