DIT - Comunicaciones en Conferencias Internacionales / International Conferences
Permanent URI for this collection
Browse
Recent Submissions
Now showing 1 - 20 of 105
Publication kaNSaaS: Combining Deep Learning and Optimization for Practical Overbooking of Network Slices(Association For Computing Machinery (Acm), 2023-10-23) Alcala Marin, Sergi; Bazco-Nogueras, Antonio; Banchs Roca, Albert; Fiore, Marco; European Commission; Ministerio de Asuntos Económicos y Transformación Digital (España)Cloud-native mobile networks pave the road for Network Slicing as a Service (NSaaS), where slice overbooking is a promising management strategy to maximize the revenues from admitted slices by exploiting the fact they are unlikely to fully utilize their reserved resources concurrently. While seminal works have shown the potential of overbooking for NSaaS in simplistic cases, its realization is challenging in practical scenarios with realistic slice demands, where its actual performance remains to be tested. In this paper, we propose kaNSaaS, a complete solution for NSaaS management with slice overbooking that combines deep learning and classical optimization to jointly solve the key tasks of admission control and resource allocation. Experiments with large-scale measurement data of actual tenant demands show that kaNSaaS increases the network operator profits by 300% with respect to NSaaS management strategies that do not employ overbooking, while outperforming by more than 20% state-of-the-art overbooking-based approaches.Publication waveSLAM: Empowering accurate indoor mapping using off-the-shelf millimeter-wave self-sensing(2023-11-20) Picazo Martinez, Pablo; Groshev, Milan; Oliva Delgado, Antonio de la; European Commission; Ministerio de Economía y Competitividad (España)This paper presents the design, implementation and evaluation of waveSLAM, a low-cost mobile robot system that uses the millimetre wave (mmWave) communication devices to enhance the indoor mapping process targeting environments with reduced visibility or glass/mirror walls. A unique feature of waveSLAM is that it only leverages existing Commercial-Off-The-Shelf (COTS) hardware (Lidar and mmWave radios) that are mounted on mobile robots to improve the accurate indoor mapping achieved with optical sensors. The key intuition behind the waveSLAM design is that while the mobile robots moves freely, the mmWave radios can periodically exchange angle and distance estimates between themselves (self-sensing) by bouncing the signal from the environment, thus enabling accurate estimates of the target object/material surface. Our experiments verify that waveSLAM can archive cm-level accuracy with errors below 22 cm and 20◦ in angle orientation which is compatible with Lidar when building indoor maps.Publication A hierarchical AI-based control plane solution for multi-technology deterministic networks(Association for Computing Machinery (ACM), 2023-10) Giardina, Pietro G.; Szilagyi, Peter; Chiasserini, Carla Fabiana; Carcel, Jose Luis; Velasco, Luis; Spadaro, Salvatore; Agraz, Fernando; Robitzsch, Sebastian; Rosales, Rafael; Frascolla, Valerio; Doostnejad, Roya; Calvillo Fernández, Alejandro; Bernini, Giacomo; European CommissionFollowing the Industry 4.0 vision of a full digitization of the industry, time-critical services and applications, allowing network infrastructures to deliver information with determinism and reliability, are becoming more and more relevant for a set of vertical sectors. As a consequence, deterministic network solutions are progressively emerging, albeit they are still bounded to specific technological domains. Even considering the existence of interconnected deterministic networks, the provision of an end-to-end (E2E) deterministic service over them must rely on a specific control plane architecture, capable of seamlessly integrate and control the underlying multi-technology data plane. In this work, we envision such a control plane solution, extending previous works and exploiting several innovations and novel architectural concepts. The proposed control architecture is service-centric, in order to provide the necessary flexibility, scalability, and modularity to deal with a heterogenous data plane. The architecture is hierarchical and encompasses a set of management platforms to interact with specific network technologies overarched by an E2E platform for the management, monitoring, and control of E2E deterministic services. Furthermore, Artificial Intelligence (AI) and Digital Twinning are used to enable network predictability and automation, as well as smart resource allocation, to ensure service reliability in dynamic scenarios where existing services may terminate and new ones may need to be deployed.Publication Aligning rTWT with 802.1Qbv: a Network Calculus Approach(Association for Computing Machinery (ACM), 2023-10) Barroso-Fernández, Carlos; Martín-Pérez, Jorge; Ayimba, Constantine; Oliva Delgado, Antonio de la; European Commission; Ministerio de Economía y Competitividad (España)Industry 4.0 applications impose the challenging demand of delivering packets with bounded latencies via a wireless network. This is further complicated if the network is not dedicated to the time critical application. In this paper we use network calculus analysis to derive closed form expressions of latency bounds for time critical traffic when 802.11 Target Wake Time (TWT) and 802.1Qbv work together in a shared 802.11 network.Publication Using RAW as control plane for wireless deterministic networks: challenges ahead(Association for Computing Machinery (ACM), 2023-10-16) Bernardos Cano, Carlos Jesús; Mourad, Alain; Groshev, Milan; Contreras, Luis M.; Mollà Roselló, Marc; Bularca, Otilia; Frascolla, Valerio; Szilagyi, Peter; Robitzsch, Sebastian; European Commission; Ministerio de Economía y Competitividad (España)This paper provides an extensive analysis of Reliable and Available Wireless (RAW) enhancements and solutions needed to manage industrial environments more effectively. Starting from the description of a representative industrial use case, an analysis of gaps and promising new extensions is performed. Namely, the need to (i) support multi-domain operation, at both technology and administrative levels; (ii) integrate RAW with edge architectures; and, (iii) increase the mobility support in RAW networks. The identified gaps are indeed not yet tackled by the relevant standardization development organizations, mainly the Internet Engineering Task Force (IETF), and are thus object of our future work.Publication pDCell: an End-to-End Transport Protocol for Mobile Edge Computing Architectures(2018-10-09) Fiandrino, Claudio; Widmer, Joerg; Kogan, Kirill; Oliva Delgado, Antonio de laPendiente publicación 2019Publication 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, FabioEnterprise 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, AitorPushing 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-TungPut 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 Análisis de las elecciones 20N(Asociación Latinoamericana de Investigadores en Campañas Electorales (ALICE), 2012-07) Aragón, Pablo; Congosto Martínez, María LuzTwitter proporciona un caudal de opinión totalmente espontáneo y al alcance del que quiera recogerlo. El volumen de información supera con creces el volumen de cualquier sondeo y el muestreo es continuo, sin embargo la información es desestructurada, limitada a 140 caracteres y muy difícil (no imposible) de segmentar por edad, sexo, nivel de estudios o económico. Para obtener rendimiento a esta nueva fuente de opinión es preciso aplicar nuevos métodos de análisis que permitan comprender la reacción de los ciudadanos tanto ante eventos señalados como en el día a día. Tras la participación de los ciudadanos en Twitter en las elecciones autonómicas (28N , 22M y 25M) y las generales del 20N hay información suficiente para dar los primeros pasos en estos nuevos métodos de análisis que complementen los ya existentes. En esta ponencia se analiza el caso particular de las elecciones del 20N a fin de determinar nuevas vías de análisis de campañas electorales.Publication Twitter, una sonda permanente de opinión y una vía para canalizar acciones ciudadanas(GIGAPP. Grupo de Investigación en Gobierno, Administración y Políticas Públicas, 2013) Congosto Martínez, María LuzTwitter proporciona un caudal público de información, recogiendo opiniones totalmente espontáneas que reflejan el pulso de la sociedad. El volumen de datos supera con creces al de cualquier sondeo y el muestreo es continuo. Sin embargo, la información es desestructurada, dispersa y difícil de segmentar. El objetivo de esta investigación es validar un método que permita extraer la información más relevante dentro de los múltiples debates sociales que se están desarrollando en Twitter para comprender cómo se está usando esta red social. Esta relevancia se ha medido tanto por la difusión de contenidos como por la persistencia de publicación de los usuarios. Este método es un primer paso hacia una metodología más sofisticada que permita complementar a las actuales encuestas que realiza el CIS para el barómetro social.Publication Seamless integration of unidirectional broadcast links into QoS-constrained broadband wireless mesh access networks(IEEE, 2009-11) Kretschmer, Mathias; Ghinea, GheorgitaWireless Mesh Networks (WMNs) have matured in recent years. They allow two nodes to communicate via multiple hops when no direct connectivity exists. This allows community networks such as Freifunk [3] to provide affordable Internet access to their communities by sharing a few gateway nodes. Increasing demand for multi-media content poses a challenge for the typical WMN routing protocols such a Optimised Link State Routing (OLSR) which lack Quality of Service (QoS) support. Although, numerous solutions have been proposed to introduce QoS awareness such as [4], those WMNs fail to meet commercial operator requirements in term of reliability and QoS guarantees. In this paper we propose the seamless integration of Broadcast technologies such as Digital Video Broadcast (DVB) to introduce support for high-bandwidth multi-media services.Publication Understanding incentives for prefix aggregation in BGP(ACM, 2009-12) Kalogiros, Costas; Bagnulo Braun, Marcelo Gabriel; Kostopoulos, AlexandrosOver the last few years, a significant amount of the effort of the Future Internet architecture is devoted in order to improve the scalability of the next generation routing architecture. In this paper, we study providers’ incentives to perform prefix aggregation or deaggregation of non-customers routes. This is essentially a tradeoff between reduced router memory and reduced capacity of attracting customer traffic. We study the case where two ISPs compete for attracting traffic, by using game theory. In particular, we propose a game-theoretic model and we analyze the properties of the equilibrium. In a symmetric case, if a single Autonomous System (AS) is found to be deaggregating a given prefix, then all others will have the incentive to do the same, even if they end up with lower benefits. We find that pure equilibria do not always exist and we derive the conditions based on two model parameters. These findings suggest that BGP instability can be a common problem in a competitive scenario.Publication OmTCP: increasing performance in server farms.(IEEE, 2010-05) Beijnum, Iljitsch van; Azcorra Saloña, Arturo; Bagnulo Braun, Marcelo GabrielNormal TCP/IP operation is for the routing system to select a best path that remains stable for some time, and for TCP to adjust to the properties of this path to optimize throughput. By executing TCP’s congestion control algorithms on multiple paths at the same time, a multipath TCP can shift its traffic to a less congested path, thus maximizing both the throughput for the multipath TCP user and leaving more capacity available for other traffic on more congested paths. And when a path fails, this can be detected and worked around by multipath TCP much more quickly than by waiting for the routing system to repair the failure. This paper proposes a one-ended multipath TCP that is implemented on the sending host only, without requiring modifications on the receiving host, for the purposes of maximizing performance in transmissions from multiply connected large servers towards singly connected end-users and recovering from failures more quickly.Publication Opportunistic mobility with multipath TCP(ACM, 2011-06-28) Raiciu, Costin; Nicolescu, Dragos; Bagnulo Braun, Marcelo Gabriel; Handley, Mark JamesHost mobility has traditionally been solved at the network layer, but even though Mobile IP has been standardised for 15 years, it hasn’t been supported by operators. IP’s double role as a location identif er and communication endpoint identif er brings a number of functional and performance problems. We argue that the best place to handle mobility is at the transport layer. While this is not a new argument, we believe that the emerging standard of Multipath TCP (MPTCP) can be used to solve many issues related to mobility. MPTCP naturally implements make-before-break, can be incrementally deployed, is backwards compatible with standard TCP, and could even ease incremental adoption of IPv6. Using simulations and indoor experiments with WiFi and 3G, we show that MPTCP gives better throughput, achieves smoother handoffs, and can be tuned to lower energy consumption.Publication Analisys of variation in IEEE802.11k channel load measurements for neighbouring WLAN systems(IIMC International Information Management Corporation, 2008-06-11) Thorpe, Christina; Murphy, Liam; Murphy, SeanThis paper focuses on analysing the variation in IEEE802.11k channel load measurements for neighbouring WLAN systems. The channel load functionality was implemented in the QualNet simulation tool, and several scenarios were configured for testing. The effects of different numbers of active systems with different traffic patterns were examined. The results obtained indicate significant variation in channel load values calculated by different stations experiencing different levels of interference. This variation leads us to question the usefulness of a single channel load measurement; hence considerable care must be taken when using and interpreting such measurements.Publication A MAC layer abstraction for heterogeneous carrier grade mesh networks(IIMC International Information Management Corporation, 2009) Serrano Yáñez-Mingot, Pablo; Patras, Paul Horatiu; Pérez-Costa, Xavier; Gloss, Bernd; Chieng, DavidProviding carrier grade services to a large number of mobile users is becoming an important challenge for wireless network operators. One promising solution for offering cost-efficient alternatives compared to classical cellular approaches is the use of wireless mesh networks along with the use of heterogeneous radio technologies. In this paper we propose a MAC abstraction layer to lessen the management burden of heterogeneous radio technologies. This abstraction layer is intended to hide the complexity and specifics of different wireless interfaces, this way supporting the use of a single set of routing and capacity handling mechanisms.Publication Link group management for carrier-grade wireless mesh networks(IEEE, 2010) Gloss, BerndTheir 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 networksPublication Impact of misbehaviour on QoS in wireless mesh networks(Springer, 2009) Szott, Szymon; Natkaniec, Marek; Banchs Roca, AlbertThis 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 Measurements and evaluations for an IEEE 802.11a based carrier-grade multi-radio wireless mesh network deployment(IEEE, 2009-08-23) Robitzsch, Sebastian; Niephaus, Christian; Fitzpatrick, John; Kretschmer, MathiasAlthough there currently exists a number of Wireless Local Area Network based mesh network deployments most have been deployed to provide best effort broadband Internet access. Consequently, they cannot meet the requirements of network operators in order to utilise these networks to offer carrier grade services. The goal of providing carrier grade services over a wireless mesh infrastructure requires high performance in terms of throughput and reliability. One way of achieving this increase in performance is to utilise multi-radio Mesh Nodes, however, due to the Physical Layer layer limitations of 802.11a this can have significant problems. This paper analyses these issues and investigates what performance can be expected when frequency multiplexing is considered. The results presented in this paper are based on real measurements taken from multi-radio Mesh Nodes and are evaluated using statistical algorithms. The main contribution of this paper is an analysis of the impact of the Adjacent Channel Interference effect in 802.11a based multi-radio Mesh Nodes.