Luis Sanabria-Russo

Luis Sanabria-Russo

Senior Researcher (R3)

Division: Communication Technologies
Category: Research
Phone: +34 93 645 29 00     Ext: 2175
Fax: +34 93 645 29 01

Luis Sanabria-Russo is a Networking and Communications engineer from Universidad Tecnológica del Centro, Venezuela (2008). He got his MSc. in Advanced Sciences of Modern Telecommunications from Univesitat de Valencia, Spain, and received his PhD in Information and Communications Technologies from Universitat Pompeu Fabra, Barcelona in 2012 and 2016, respectively.

With a background mostly related to building and maintaining Cisco-based routing, switching and WLAN infrastructures, during his PhD he contributed with research into the development of collision-free Medium Access Control (MAC) protocols for IEEE 802.11 (WLAN) networks.

Specifically, in order to serve the ever-increasing number of users wanting to access the Internet (or other wired network) via WiFi, Luis proposed deep but still standards-compatible modifications to WLAN MAC Decentralized Contention Functions (DCF). Particularly, he further developed strategies to turn WiFi saturated scenarios into TDMA-like environments, effectively eliminating the unusable channel time introduced by Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocols. This is particularly relevant in dense scenarios, where many collisions render the channel unusable for longer periods, ending up in a reduced channel capacity. Interestingly, his proposals to eliminate collisions changing the way WiFi users access the wireless medium leveraging a deterministic backoff timer after successful transmissions, while compensating users with longer backoff with proportional MSDU aggregated transmissions were proven successful in increasing the available throughput in very dense IEEE 802.11 networks.

Given the standards-compatible nature of his proposals, he was able to model and simulate his proposals using custom made C++ simulators and widely used network simulation engines, like NS-3. Such environments allowed the development of further techniques to accommodate and ever-increasing or even dynamically changing number of WiFi users (e.g., non-saturated scenarios) without losing backwards compatibility and evenly sharing the available throughput among transmitters (i.e., throughput fairness).  Moreover, the same ideas able to build and maintain collision-free schedules in saturated WiFi networks were extended to support multiple IEEE 802.11e queues, allowing networks to prioritize traffic in a backwards compatible-way, albeit collision-free (Traffic differentiation in dense collision-free WLANs using CSMA/ECA).

Relevantly, this line of his research work took him closer to cutting edge progress related to open-source firmware for WiFi cads and other related progress being made into WiFi card firmware reconfigurability. This culminated with an actual validation of a collision-free MAC protocol for dense WiFi networks on top of commercial off-the-shelves (COTS) devices leveraging WiFi cards flashed with Luis’ protocol using open-source firmware and deployed in a controlled experimental setup. A comprehensible summary can be found in the international collaboration article “A High Efficiency MAC Protocol for WLANs: Providing Fairness in Dense Scenarios”.

The effective modelling of network abstractions, software development, experimental setup planning and operations required during his early research strongly influenced his next step. In 2016, his interest shifted towards Software Defined Network (SDN), Network Functions Virtualisation (NFV) and other abstractions to different layers of the communication stack, mainly after his initial contributions to European projects (i.e., NFV-enabled Experimental Platform for 5G Tactile Internet Support in Industrial Environments).

Currently, his research explores the role cloud-native approaches and network operations (NetDevOps) have in the design and management of data-driven network architectures in IoT, 5G and beyond 5G. Particularly, his focus is put into the concept of distributed network management frameworks leveraging stateless functions as placeholders for arbitrary control loops (e.g., CURATE: On-Demand Orchestration of Services for Health Emergencies Prediction and Mitigation). Such research direction is strongly motivated by the concept of zero-touch service/network management, heralded by the specifications proposed by the ETSI Zero-touch network and Service Management (ZSM) group.

Luis is part of the SMARTECH research group at the Communications Technologies Division in CTTC. He actively participates in ongoing H2020 research projects, such as SEMIoTICS5GSOLUTIONSMonB5G5G-ROUTESOPTIMIST and DARLENE. His roles are related to end-to-end experimental infrastructure design, provisioning and sharing. He has also participated in the preparation of H2020 proposals, specifically at sections related to ETSI NFV, MEC, ZSM and ENI specifications; cloud-native approaches and DevOps methodologies for the implementation of Use Cases.

Leveraging his teaching background strongly footed on the development of Massive Open Online Courses, such as A Hands-on Experience with WSNs” for Universitat Pompeu Fabra, Luis also participates in technical seminars oriented towards 5G end-to-end experimentation for different verticals, e.g. Healthcare and IoT; and techniques, e.g. cloud-native approach to ML pipeline design (e.g., Scalable and Flexible IoT data analytics: when Machine Learning meets SDN and Virtualization).

Relevantly, he has also presented contributions and developed diverse technical demonstrations of proof-of-concepts at international conferences and events, such as ETSI IoTWeek Showcases, IEEE INFOCOM (e.g., IoT Data Analytics as a Network Edge ServiceWLANs throughput improvement with CSMA/ECA), IEEE CAMAD (e.g., Elderly Care Leveraging Pervasive Computing), IEEE Globecom (e.g., LTE as a Service: leveraging NFV for realising dynamic 5G network slicingSDN-Based Pro-Active Flow Installation Mechanism for Delay Reduction in IoT), and IEEE ICC (e.g., Implementation and experimental evaluation of a Collision-Free MAC protocol for WLANsFuture evolution of CSMA protocols for the IEEE 802.11 standard). He has also served as Technical Program Committee member for IEEE GLOBECOM 2020 Special Workshop on Communications and Networking Technologies for Responding to COVID-19, IEEE Global Communications Conference: Selected Areas in Communications: E-Health, IEEE International Workshop on Computer-Aided Modeling and Design of Communication Links and Networks (CAMAD), IEEE International Conference on Communications (ICC): Communication QoS, Reliability and Modeling Symposium.

Currently, Luis fills the role of lead architect, developer and maintainer of an end-to-end 5G experimentation platform being put together at SMARTECH - CTTC.

Google Scholar - Arxiv