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See detailAn Energy Efficient Distributed Coordination Function Using Bidirectional Transmissions and Sleep Periods for IEEE 802.11 WLANs
Palacios, Raul; Granelli, Fabrizio; Kliazovich, Dzmitry UL et al

in IEEE Global Communications Conference (GLOBECOM), Atlanta, GA, USA, 2013 (2013)

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See detailAn energy-efficient point coordination function using bidirectional transmissions of fixed duration for infrastructure IEEE 802.11 WLANs
Palacios, Raul; Granelli, Fabrizio; Gajic, Danica et al

in IEEE International Conference on Communications (ICC), Budapest, Hungary, 2013 (2013)

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See detailEnergy-Efficient Data Replication in Cloud Computing Datacenters
Boru, Dejene; Kliazovich, Dzmitry UL; Granelli, Fabrizio et al

in IEEE Globecom 2013 International Workshop on Cloud Computing Systems, Networks, and Applications (CCSNA), Atlanta, GA, USA, 2013 (2013)

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See detailA Holistic Model for Resource Representation in Virtualized Cloud Computing Data Centers
Guzek, Mateusz UL; Kliazovich, Dzmitry UL; Bouvry, Pascal UL

in IEEE International Conference on Cloud Computing Technology, Bristol, UK, 2013 (2013)

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See detailDENS: data center energy-efficient network-aware scheduling
Kliazovich, Dzmitry UL; Bouvry, Pascal UL; Khan, Samee Ullah

in Cluster Computing (2013), 16(1), 65-75

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See detaile-STAB: Energy-Efficient Scheduling for Cloud Computing Applications with Traffic Load Balancing
Kliazovich, Dzmitry UL; Arzo, Sisay T.; Granelli, Fabrizio et al

in IEEE International Conference on Green Computing and Communications (GreenCom), Beijing, China 2013 (2013)

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See detailAccounting for load variation in energy-efficient data centers
Kliazovich, Dzmitry UL; Arzo, Sisay T.; Granelli, Fabrizio et al

in IEEE International Conference on Communications (ICC), Budapest, Hungary, 2013 (2013)

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See detailCA-DAG: Communication-Aware Directed Acyclic Graphs for Modeling Cloud Computing Applications
Kliazovich, Dzmitry UL; Pecero, Johnatan UL; Tchernykh, Andrei et al

in Proceedings of the 2013 IEEE Sixth International Conference on Cloud Computing (2013)

The review of the requirements of different cloud applications identified the need to consider communication processes explicitly and equally to the computing tasks. Following this observation, we propose ... [more ▼]

The review of the requirements of different cloud applications identified the need to consider communication processes explicitly and equally to the computing tasks. Following this observation, we propose a new communication-aware model for cloud computing applications, called CA-DAG. This model is based on Directed Acyclic Graphs (DAGs) that in addition to computing vertices include separate vertices to represent communications. Such a representation allows making separate resource allocation decisions, assigning processors to handle computing jobs and network resources for information transmissions, such as application database requests. [less ▲]

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See detailA survey on resource allocation in high performance distributed computing systems
Hussain, Hameed; Malik, Saif Ur Rehman; Hameed, Abdul et al

in Parallel Computing (2013), 39(11), 709-736

An efficient resource allocation is a fundamental requirement in high performance computing (HPC) systems. Many projects are dedicated to large-scale distributed computing systems that have designed and ... [more ▼]

An efficient resource allocation is a fundamental requirement in high performance computing (HPC) systems. Many projects are dedicated to large-scale distributed computing systems that have designed and developed resource allocation mechanisms with a variety of architectures and services. In our study, through analysis, a comprehensive survey for describing resource allocation in various HPCs is reported. The aim of the work is to aggregate under a joint framework, the existing solutions for HPC to provide a thorough analysis and characteristics of the resource management and allocation strategies. Resource allocation mechanisms and strategies play a vital role towards the performance improvement of all the HPCs classifications. Therefore, a comprehensive discussion of widely used resource allocation strategies deployed in HPC environment is required, which is one of the motivations of this survey. Moreover, we have classified the HPC systems into three broad categories, namely: (a) cluster, (b) grid, and (c) cloud systems and define the characteristics of each class by extracting sets of common attributes. All of the aforementioned systems are cataloged into pure software and hybrid/hardware solutions. The system classification is used to identify approaches followed by the implementation of existing resource allocation strategies that are widely presented in the literature. [less ▲]

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See detailARQ Proxy: Cross-Layer Error Recovery in Wireless Access Networks
Kliazovich, Dzmitry UL; Redana, Simone; Granelli, Fabrizio

in International Journal of Communication Systems (2012), 25(4), 461-477

Wireless networks are being increasingly employed to provide mobile access to network services. In most existing standards, reliable transmission on the wireless medium is achieved through the ... [more ▼]

Wireless networks are being increasingly employed to provide mobile access to network services. In most existing standards, reliable transmission on the wireless medium is achieved through the introduction of ARQ schemes at MAC layer, a strategy which is also employed by TCP for reliable end-to-end data delivery. The paper proposes an approach to overcome the performance degradation deriving from the duplicate ARQ strategies implemented at the transport and MAC layers by introducing a cross-layer solution to reduce unnecessary transmissions on the wireless medium. Furthermore, the paper describes how the proposed scheme, called ARQ Proxy, can be deployed in three different wireless technologies (3G Long-Term Evolution, Wi-Fi, and WiMAX) and provides extensive validation of the achievable improvement through simulations. [less ▲]

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See detailSimulating Communication Processes in Energy-Efficient Cloud Computing Systems
Kliazovich, Dzmitry UL; Bouvry, Pascal UL; Khan, Samee Ullah

in CLOUDNET (2012)

Cloud computing data centers are becoming increasingly popular for the provisioning of computing resources. The cost and operating expenses of data centers have skyrocketed with the increase in computing ... [more ▼]

Cloud computing data centers are becoming increasingly popular for the provisioning of computing resources. The cost and operating expenses of data centers have skyrocketed with the increase in computing capacity. In this chapter, we survey the main techniques behind enabling energy efficiency in data centers and present simulation environment for energy-aware cloud computing. Along with the workload distribution, the focus is devoted to simulating packet-level communications in realistic setups. Finally, the effectiveness of common power management solutions is assessed and a scheduling methodology that combines energy efficiency and network awareness is presented. [less ▲]

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See detailGreenCloud: a packet-level simulator of energy-aware cloud computing data centers
Kliazovich, Dzmitry UL; Bouvry, Pascal UL; U. Khan, Samee

in Journal of Supercomputing (2012), 62(3), 1263-1283

Cloud computing data centers are becoming increasingly popular for the provisioning of computing resources. The cost and operating expenses of data centers have skyrocketed with the increase in computing ... [more ▼]

Cloud computing data centers are becoming increasingly popular for the provisioning of computing resources. The cost and operating expenses of data centers have skyrocketed with the increase in computing capacity. Several governmental, industrial, and academic surveys indicate that the energy utilized by computing and communication units within a data center contributes to a considerable slice of the data center operational costs. In this paper, we present a simulation environment for energy-aware cloud computing data centers. Along with the workload distribution, the simulator is designed to capture details of the energy consumed by data center components (servers, switches, and links) as well as packet-level communication patterns in realistic setups. The simulation results obtained for two-tier, three-tier, and three-tier high-speed data center architectures demonstrate the effectiveness of the simulator in utilizing power management schema, such as voltage scaling, frequency scaling, and dynamic shutdown that are applied to the computing and networking components. [less ▲]

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See detailCooperative Inter-node and Inter-layer Optimization of Network Protocols
Kliazovich, Dzmitry UL; Granelli, Fabrizio; Fonseca, Nelson L. S.

in Cooperative Networking (2011)

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See detailSurvey on Signaling Techniques for Cognitive Networks
Kliazovich, Dzmitry UL; Granelli, Fabrizio; Fonseca, Nelson L. S.

in Survey on Signaling Techniques for Cognitive Networks (2011)

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See detailQueue Management Mechanism for 802.11 Base Stations
Kliazovich, Dzmitry UL; Gomes, Pedro Henrique; Granelli, Fabrizio et al

in IEEE Communications Letters (2011), 15(7), 728-730

This paper presents a novel queue management mechanism for base stations in infrastructure IEEE 802.11 networks. The mechanism is transparent to high-level protocols and is compatible with the standard ... [more ▼]

This paper presents a novel queue management mechanism for base stations in infrastructure IEEE 802.11 networks. The mechanism is transparent to high-level protocols and is compatible with the standard. Its effectiveness is illustrated by showing that it can ameliorate the RTT unfairness and the MAC anomaly problems in wired-cum-wireless networks. [less ▲]

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See detailA Metamodeling Approach for Cross-layer Optimization: A framework and Application to Voice over WiFi
Papapanagiotou, Ioannis; Granelli, Fabrizio; Kliazovich, Dzmitry UL et al

in Simulation Modelling Practice & Theory (2011), 19(9), 2117-2129

Cross-layer design has been proposed to optimize the performance of networks by exploiting the interrelations among parameters and procedures at different levels of the protocol stack. This paper ... [more ▼]

Cross-layer design has been proposed to optimize the performance of networks by exploiting the interrelations among parameters and procedures at different levels of the protocol stack. This paper introduces a quantitative framework for the study of cross-layer interactions, which enables design engineers to analyze and quantify interlayer dependencies and to identify the optimal operating point of the system, by using network economic theory principles. The framework is then used for performance optimization of a single-cell Voice over WiFi (VoWiFi) system. Insights gained from the considered scenario enable us to define a novel cross-layer Call Admission Control (CAC) scheme. The multistage CAC takes into account Quality of Service (QoS) criteria, which provide satisfaction to the end user, as well as revenue criteria that maximize the possible profit of the WiFi provider. [less ▲]

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See detailAn overview of energy efficiency techniques in cluster computing systems
Valentini, Giorgio Luigi; Lassonde, Walter; Khan, Samee Ullah et al

in Cluster Computing (2011), 16(1), 3-15

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See detailHierarchical Management Architecture for Multi-Access Networks
Kliazovich, Dzmitry UL; Sutinen, Tiia; Kokkoniemi-Tarkkanen, Heli et al

in Hierarchical Management Architecture for Multi-Access Networks (2011)

Future Internet will be highly heterogeneous supporting a multitude of access technologies with overlapping coverages. The automation and optimization of network operations like resource, mobility or QoS ... [more ▼]

Future Internet will be highly heterogeneous supporting a multitude of access technologies with overlapping coverages. The automation and optimization of network operations like resource, mobility or QoS management in such a multi-access and multi-operator environment becomes a very challenging but vital task in order to ensure smooth network operation and user satisfaction. Cognitive network management is seen as the solution for this. However, any self* mechanism designed for small-scale networks and requiring an accurate view of the whole network status for decision-making will not be able to meet the future needs. In this paper, we propose a novel multi-access network management architecture targeted for large heterogeneous multi-access and multi-operator networks.The architecture introduces hierarchy to network management to ensure scalability. We also present results obtained from a case example of the proposed decision-making solution implemented to our cognitive network testbed. [less ▲]

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See detailIntroduction: Why Cross-Layer? Its Advantages and Disadvantages
Kliazovich, Dzmitry UL; Granelli, Fabrizio

in Cross Layer Designs in WLAN Systems (2010)

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See detailService-Aware Retransmission Control in Cellular Networks
Ben Halima, Nadhir; Kliazovich, Dzmitry UL; Fabrizio, Granelli

in Journal of Computer Systems, Networks, and Communications (2010)

This paper proposes a service-aware cross-layer approach between application/transport layers on the mobile terminal and link layer on the wireless base station to enable dynamic control on the level of ... [more ▼]

This paper proposes a service-aware cross-layer approach between application/transport layers on the mobile terminal and link layer on the wireless base station to enable dynamic control on the level of per-packet error protection for multimedia data streams. Specifically, in the context of cellular networks, the proposed scheme enables the mobile terminal to specify to the base station the desired level of Hybrid ARQ (HARQ) protection by using an in-band control feedback channel. Such protection is dynamically adapted on a per-packet basis and depends on the perceptual importance of different packets as well as on the reception history of the flow. Experimental results demonstrate the potential benefits deriving from the proposed strategy either for audio and video real-time streams as well as for TCP-based data transfers. [less ▲]

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