Oct 1, 2018
Oct 1, 2018
Sep 1, 2018
Jul 1, 2018

Recent Publications

More Publications

. Cellular access multi-tenancy through small-cell virtualization and common RF front-end sharing. In Elsevier COMCOM, 2018.

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. Overbooking Network Slices through Yield-driven End-to-End Orchestration. In ACM CoNEXT, 2018.

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. Joint Optimization of Edge Computing Architectures and Radio Access Networks. In IEEE Journal on Selected Areas in Communications, 2018.

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. LaSR: A Supple Multi-Connectivity Scheduler for Multi-RAT OFDMA Systems. In IEEE Transactions on Mobile Computing, 2018.

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. ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum. In IEEE/ACM Transactions on Networking, 2018.

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Selected Publications

The main contribution of this paper is threefold. First, we design a hierarchical control plane to manage the orchestration of slices end-to-end, including radio access, transport network, and distributed computing infrastructure. Second, we cast the orchestration problem as a stochastic yield management problem and propose two algorithms to solve it: an optimal Benders decomposition method and a suboptimal heuristic that expedites solutions. Third, we implement an experimental proof-of-concept and assess our approach both experimentally and via simulations with topologies from three real operators and a wide set of realistic scenarios.
In ACM CoNEXT, 2018

In this paper, we propose a novel modeling approach and a rigorous analytical framework, MvRAN, that minimizes vRAN costs and maximizes MEC performance. Our framework selects jointly the base station function splits, the fronthaul routing paths, and the placement of MEC functions.
In IEEE Journal on Selected Areas in Communications, 2018

In this paper we propose LaSR, a practical multi-connectivity scheduler for OFDMA-based multi-RAT systems. LaSR makes optimal discrete control actions by solving a sequence of simple optimization problems that do not require prior information of traffic patterns. In marked contrast to previous work, the flexibility of our approach allows us to construct scheduling policies that achieve a good balance between system cost and utility satisfaction, while jointly operate across heterogeneous RATs, accommodate real-system requirements, and guarantee system stability.
In IEEE Transactions on Mobile Computing, 2018

The 3GPP has recently defined a LAA scheme to enable global U-LTE deployment, aiming at (i) ensuring fair coexistence with incumbent WiFi networks, i.e., impacting on their performance no more than another WiFi device, and (ii) achieving superior airtime efficiency as compared to WiFi. In this paper we show the standardized LAA fails to simultaneously fulfill these objectives, and design an alternative orthogonal (collision-free) listen-before-talk coexistence paradigm that provides a substantial improvement in performance, yet imposes no penalty on existing WiFi networks. We derive two LAA optimal transmission policies, ORLA and OLAA, that maximize LAA throughput in both asynchronous and synchronous (i.e., with alignment to licensed anchor frame boundaries) modes of operation, respectively.
In IEEE/ACM Transactions on Networking, 2018

In this paper, we propose Stochastic Earliest Delivery Path First (S-EDPF), a generalization of EDPF which takes into account uncertainty and time-variation in path delays yet has low-complexity suited to practical implementation. Moreover, we integrate a novel low-delay Forward Error Correction (FEC) scheme into S-EDPF in a principled manner by deriving the optimal schedule for coded packets across multiple paths.
In IEEE Transactions on Mobile Computing, 2017

In this work we present srsLTE, an open-source platform for LTE experimentation designed for maximum modularity and code reuse and fully compliant with LTE Release 8.
In ACM WiNTECH, 2016

Projects

5G-TRANSFORMER

5G-TRANSFORMER is an H2020 PPP project co-funded by the European Commission under the ICT theme (H2020-ICT-2016-2). 5G-TRANSFORMER aims to transform today’s mobile transport network into an SDN/NFV-based Mobile Transport and Computing Platform (MTP), which brings the “Network Slicing” paradigm into mobile transport networks by provisioning and managing MTP slices tailored to the specific needs of vertical industries.

5G-CROSSHAUL

5G-Crosshaul is an H2020 PPP project co-funded by the European Commission under the ICT theme (Call 14). The 5G-Crosshaul project aims at developing a 5G integrated backhaul and fronthaul transport network enabling a flexible and software-defined reconfiguration of all networking elements in a multi-tenant and service-oriented unified management environment.

FLAVIA

FLAVIA is a project funded by the European Commission under FP7 Call 5, Objective 1.1: The Network of the Future. FLAVIA fosters a paradigm shift towards the Future Wireless Internet: from pre-designed link services to programmable link processors. The key concept is to expose flexible programmable interfaces enabling service customization and performance optimization through software-based exploitation of low-level operations and control primitives, e.g., transmission timing, frame customization and processing, spectrum and channel management, power control, etc.

CARMEN

CARMEN (CARrier grade MEsh Networks) is funded by the European Commission under the ICT theme ICT-2007.1.1 - The network of the future. CARMEN will study and specify a wireless mesh network supporting carrier grade triple-play services for mobile/fixed network operators. Future operator networks will be comprised of a common core network and several access networks, and the CARMEN access network will complement other access technologies by providing a low cost and fast deployment mesh network access technology. The project proposes the integration of heterogeneous wireless technologies in a multi-hop fashion to provide scalable and efficient ubiquitous quad-play carrier services.

Service to Research Community

Editorial and Organization duties

Technical Program Committee (TPC) and Reviewing duties

  • TPC member in IEEE Globecom (2018), MadCom (2018), FiCloud (2018), IEEE COMNETSAT (2018), IEEE MASS (2018), EFC-IoT (2018), IEEE VTC (2015-Fall, 2017-spring), Elsevier Computer Communications (2014, 2015, 2016), MACOM (2014, 2015), AWICT (2015), IEEE GlobalSIP (2015), MOBIWAC (2014, 2015, 2016, 2017, 2018), ACM WiNTECH (2013, 2016, 2017), SustainIT (2013, 2014, 2015, 2016), ICALP (2012)
  • Regular reviewer of IEEE Communication Letters (2014 Exemplary Reviewer), IEEE Journal on Selected Areas in Communication (JSAC), IEEE Transactions on Vehicular Technology, IEEE INFOCOM, IEEE Wireless Communications, IEEE/ACM Transactions on Networking, IEEE Transactions on Mobile Computing, IEEE Communications Magazine, IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Communication Surveys & Tutorials, IEEE Globecom, IEEE VTC, Elsevier Adhoc Networks, Springer Wireless Networks, International Conference on Communications (ICT), EURASIP Journal on Wireless Communications and Networking, IEEE Globecom, International Workshop on Multiple Access Communications (MACOM), Elsevier Computer Communications (COMCOM), Elsevier Computer Networks (COMNET), International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), International Workshop on Wireless Network Testbeds (WiNTECH), International Colloquium on Automata, Languages and Programming (ICALP), International Symposium on a World of Wireless, Mobile and Multimedia Networks (IEEE WoWMoM).

Teaching

I have supervised the following students:

  • Josep Xavier Salvat, M.Sc. Telematics Eng., Universitat Politècnica de Catalunya (2016).
  • Jose Maria Montes Yuste, B.Sc. Telematics Eng., University Carlos III of Madrid (2013).
  • Georgios Z. Papadopoulos, M.Sc Telematics Eng., University Carlos III of Madrid (2012).
  • Vasileios Papadopoulos, B.Sc. Software Eng., Alexander Technological Institute of Thessaloniki (2011).

My teaching duties, while being a Teaching Assistant (TA) at UC3M, were:

  • Theory of networks (10 /11, 11 /12, 12 /13): Introduction to probability, Markov models and queueing theory. B.Sc. Telematics Eng. University Carlos III of Madrid
  • Audiovisual mobile systems (12 /13): Introduction to wireless communication systems. B.Sc. Telematics Eng. University Carlos III of Madrid
  • Networks and Services (09 /10, 10 /11, 11 /12): General introduction to communication networks. B.Sc. Telematics Eng. University Carlos III of Madrid

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