DIT - Capítulos de Monografías

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Now showing 1 - 10 of 10
  • Publication
    SEMPER: a stateless traffic engineering solution for WAN based on MP-TCP
    (IEEE, 2018-07-31) García Avilés, Ginés; Gramaglia, Marco; Serrano Yáñez-Mingot, Pablo; Portoles, Marc; Banchs Roca, Albert; Maino, Fabio
    Enterprise Networking has a strong set of requirements in terms of resiliency, reliability and resources usage. With current approaches being based on monolithic and expensive infrastructures using dedicated overlay links, providers are moving to more economical hybrid solutions that encompass private dedicated links with public/regular Internet connections. However, these usually rely on complex, hardware-dependent and/or proprietary Traffic Engineering (TE) solutions, which are computationally costly, in particular for the forwarding nodes. In this paper, we propose SEMPER: a lightweight TE solution based on MP-TCP that, in contrast to other TE solutions, moves the complexity to the endpoints of the connection, and relieves the forwarding elements from complex operations or even maintaining state. As our evaluation shows, SEMPER efficiently makes use of all available paths between the endpoints while maintaining fairness, and properly adapts to variations on the available capacity.
  • Publication
    Opportunities and Challenges of Joint Edge and Fog Orchestration
    (IEEE, 2018-05-31) Cominardi, Luca; Abdullaziz, Osamah Ibrahiem; Antevski, Kiril; Chundrigar, Shahzoob Bilal; Gdowski, Robert; Kuo, Ping-Heng; Mourad, Alain; Yen, Li-Hsing; Zabala Orive, Aitor
    Pushing contents, applications, and network functions closer to end users is necessary to cope with the huge data volume and low latency required in future 5G networks. Edge and fog frameworks have emerged recently to address this challenge. Whilst the edge framework was more infrastructure focused and more mobile operator-oriented, the fog was more pervasive and included any node (stationary or mobile), including terminal devices. This article analyzes the opportunities and challenges to integrate, federate, and jointly orchestrate the edge and fog resources into a unified framework.
  • Publication
    An Integrated Edge and Fog System for Future Communication Networks
    (IEEE, 2018-05-31) Kuo, Ping-Heng; Mourad, Alain; Lu, Chenguang; Berg, Miguel; Duquennoy, Simon; Chen, Ying-Yu; Hsu, Yi-Huai; Zabala Orive, Aitor; Ferrari, Riccardo; González Díaz, Sergio; Li, Chi-Yu; Chien, Hsu-Tung
    Put together, the edge and fog form a large diverse pool of computing and networking resources from different owners that can be leveraged towards low latency applications as well as for alleviating high traffic volume in future networks including 5G and beyond. This paper sets out a framework for the integration of edge and fog computing and networking leveraging on ongoing specifications by ETSI MEC ISG and the OpenFog Consortium. It also presents the technological gaps that need to be addressed before such an integrated solution can be developed. These noticeably include challenges relating to the volatility of resources, heterogeneity of underlying technologies, virtualization of devices, and security issues. The framework presented is a Launchpad for a complete solution under development by the 5G-CORAL consortium.
  • Publication
    Software Defined 5G Converged Mobile Access Networks: Energy Efficiency Considerations
    (Optical Society of America, 2017-11) Marotta, A.; Kondepu, K.; Doddikrinda, S.; Cassioli, D.; Antonelli, Cristian; Correia, L.M.; Valcarenghi, Luca
    Software Defined Mobile Networks and Software Defined Access Networks bring programmability principle into mobile and optical domains. In this work we propose an integrated control approach and show the benefit in terms of energy efficiency.
  • Publication
    VoIPiggy: Implementation and evaluation of a mechanism to boost voice capacity in 802.11 WLANs
    (IEEE - The Institute Of Electrical And Electronics Engineers, Inc, 2012-03) Salvador, Pablo; Gringoli, Francesco; Mancuso, Vincenzo; Serrano Yáñez-Mingot, Pablo; Mannocci, Andrea; Banchs Roca, Albert
    Supporting voice traffic in existing WLANs results extremely inefficient, given the large overheads of the protocol operation and the need to prioritize this traffic over, e.g., bulky transfers. In this paper we propose a simple scheme to improve the efficiency of WLANs when voice traffic is present. The mechanism is based on piggybacking voice frames over the acknowledgments, which reduces both frame overheads and time spent in contentions. We evaluate its performance in a large-scale testbed consisting on 33 commercial off-the-shelf devices. The experimental results show dramatic performance improvements in both voice-only and mixed voice-and-data scenarios.
  • Publication
    Link group management for carrier-grade wireless mesh networks
    (IEEE, 2010) Gloss, Bernd
    Their distributed nature makes mesh networks easy to deploy and robust against node and link failures. However, distributing functionality adds high signalling overhead and delays. Forming resource clusters in wireless mesh networks is a wellknown concept to alleviate these issues. This article describes a link group system for carrier-grade wireless mesh networks that provides absolute QoS guarantees. In order to support heterogeneous wireless mesh networks, the system interface of this link group system is implemented as a technology independent interface. Performance evaluations show a good fairness without requiring per-flow queuing, a good overall system performance, and small packet delays in multi-hop setups, which makes these link groups an important component of carrier-grade wireless mesh networks
  • Publication
    Impact of misbehaviour on QoS in wireless mesh networks
    (Springer, 2009) Szott, Szymon; Natkaniec, Marek; Banchs Roca, Albert
    This paper analyzes the impact of misbehaviour on QoS provisioning in wireless mesh networks. Misbehaviour occurs when a network participant decides not to cooperate. Since cooperation is fundamental for distributed environments such as mesh networks, misbehaviour can be a serious threat to them. In this work, the authors focus on the IEEE 802.11 EDCA medium access function which provides QoS in mesh networks. Simulation studies have been performed to determine what realistic forms of misbehaviour can occur and what their impact is. From these results the most beneficial forms of MAC layer misbehaviour in multihop mesh networks are derived.
  • Publication
    Design and capacity performance analysis of wireless mesh network
    (ACM, 2008) Ting, A.; Chieng, David
    From the network operator’s point of view, the high CAPEX/OPEX cost resulting from fixed/wired backhaul links can be inhibitive to successful deployment of broadband wireless services. The emerging wireless mesh network (WMN) technology is seen as one of the potential solutions which may reduce wired backhaul dependency through multihop transmission. Despite the advantages, many remain sceptical on WMN’s network capacity and scalability performances particularly when the user density is high. This paper provides an insight on the best possible upper-bound capacity performance of WMN, taking into consideration three key design parameters namely 1) Percentage of wired backhaul points per network, 2) Mesh-to-Access Link-Rate Ratio (R) and 3) Number of radio interfaces per mesh node including hybrid radio options. These design options are compared and contrasted with different deployment densities. The results generally show that the higher the number of backhaul points, the higher the effective access capacity available to mesh node and hence user domain. Increasing the R and the number of radio per mesh node are two alternative means to push up the effective access capacity per mesh node without increasing the number of wired backhaul points. This is most significant in multi radio system where about 80% of the backhaul points can be eliminated with R= 3 in order to maintain effective access capacity close to full rate (Capacity, C=1) per mesh node. It is also found that 50% of the backhaul points can be eliminated with R=2 for all radio options (except for the pure single radio case).
  • Publication
    Towards QoS provisioning in a heterogeneous carrier-grade wireless mesh access networks using unidirectional overlay cells
    (Springer, 2009-11) Kretschmer, Mathias; Niephaus, Christian; Ghinea, Gheorghita
    The visibility and success ofWireless Mesh Network (WMN) deployments has raised interest among commercial operators in this technology. Compared to traditional operator access networks WMNs have the potential to offer easier deployment and flexible self-reconfiguration at lower costs. A WMN-type architecture considered as an alternative for an operator access network must meet similar requirements such as high availability and guaranteed QoS in order to support triple-play content provisioning. In this paper we introduce an architecture of such a Carrier-grade Wireless Mesh Access Network (CG-WMAN). We then present our contribution, an approach to seamlessly integrate unidirectional broadcast cells (i.e. DVB-T) into such a CG-WMAN. This allows higher layer protocols to utilize broadcast cells like regular mesh links, where beneficial for a given payload and receiver distribution. We then present a typical use case and discuss for which combinations of traffic type, user distribution and QoS requirements the use of longer range broadcast technologies can help to improve the overall CG-WMAN performance in terms of throughput and reliability.
  • Publication
    Throughput and energy efficiency in IEEE 802.11 WLANs: friends or foes?
    (Springer, 2009) Serrano, Pablo; Banchs Roca, Albert; Vollero, Luca; Hollick, Matthias
    Understanding and optimizing the energy consumption of wireless devices is critical to maximize network lifetime and to provide guidelines for the design of new protocols and interfaces. In this work we first provide an accurate analysis of the energy performance of an IEEE 802.11 WLAN, and then we derive the configuration to maximize it. We also analyze the impact of the energy configuration of the device on the throughput performance, and discuss in which circumstances throughput and energy efficiency can be both maximized and where they constitute different challenges.
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