Media Image
ricard vilalta
Company
CTTC
Position
Senior Researcher

Publications

Conferences

End-to-End Interdomain Transport Network Slice Management Using Cloud-based SDN Controllers

2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)
In spite of their popularity, developing secure smart contracts remains a challenging task. Existing solutions are either impractical as they do not support many complex real-world contracts or leave the burden to developers for fixing bugs.
Journals

Evaluation of the abstraction of optical topology models in blockchain-based data center interconnection

2022 - Journal of Optical Communications and Networking, Vol. 14, Issue 4, pp. 211 - 221
Data center (DC) interconnection allows us to have optical transmissions between DCs directly connected to optical networks, avoiding the use of a packet-based infrastructure.
Journals

Scalability analysis of machine learning QoT estimators for a cloud-native SDN controller on a WDM over SDM network

2022 - Journal of Optical Communications and Network, Vol. 14, Issue 4, pp. 257-266
Maintaining a good quality of transmission (QoT) in optical transport networks is key to maintaining the service level agreement between the user and the service provider.
Conferences

SDN Control Architectures for WDM over SDM (WDMoSDM) Networks

2021 Photonics in Switching and Computing Conference
We provide an overview of SDN control architectures for WDM over SDM (WDMoSDM) optical networks. We address dynamic management of end-to-end connec- tivity services and WDM virtual network topologies (VNTs) for partially disaggregated multi-domain WDMoSDM networks.
Conferences

End-to-End Network Slice Stitching using Blockchain-based Peer-to-Peer Network Slice Managers and Transport SDN Controllers

2021 Optical Fiber Communications Conference and Exhibition (OFC2021)
This paper presents and experimentally validates a Blockchain-based architecture to manage End-to-End Network Slice Deployment by stitching Network Slice Subnets in edge/cloud computing domains connected through packet/optical transport networks domains managed by different operators.
Conferences

First Scalable Machine Learning Based Architecture for Cloud-native Transport SDN Controller

2021 Optical Fiber Communications Conference and Exhibition (OFC2021)
We present a cloud-native architecture with a machine learning QoT predictor that enables cognitive functions in transport SDN controllers. We evaluate the QoT predictor training and auto-scaling capabilities in a real WDM/SDM testbed.
Conferences

Multi-layer Transport Network Slicing with Hard and Soft Isolation

2021 Optical Fiber Communications Conference and Exhibition (OFC2021)
We validate the deployment of isolated transport network slices in IP over DWDM network. To this end, an isolated transport network slice is deployed using multi-layer isolation mechanisms based on OpenConfig and ONF Transport API.
Conferences

Demo paper: Scalable Architecture for Cloud-native Transport SDN Controller Using GNPy and Machine Learning techniques for QoT estimation

2021 Optical Fiber Communications Conference and Exhibition (OFC2021)
This demo shows a cloud-native SDN controller that can estimate end-to-end QoT using both analytical (GNPy) and machine learning algorithms on WDM systems. This transport SDN controller is able to scale horizontally using custom metrics.
Conferences

Blockchain-Based Connectivity Provisioning in Multiple Transport SDN Domains

2021 International Conference on Optical Network Design and Modeling (ONDM2021)
Hierarchical Software Define Networking (SDN) architectures is used to manage the co-existence of multiple domains by having an element on top. A collaborative relation-ship between domains, might solve this issue. Blockchain may become the key element for this change to happen.
Conferences

Advances in SDN control for Beyond 100G disaggregated optical networks

2021 European Conference on Optical Communication (ECOC2021)
This tutorial considers the evolution of SDN control for optical transport networks in disaggregated scenarios, focusing on its requirements and challenges when applied to "beyond 100G" networks - term that jointly refers to the use of coherent technology, data rates beyond 100G and the evolution
Conferences

Scalable Physical Layer Security Components for Microservice-Based Optical SDN Controllers

2021 European Conference on Optical Communication (ECOC2021)
We propose and demonstrate a set of microservice-based security components able to perform physical layer security assessment and mitigation in optical networks. Results illustrate the scalability of the attack detection mechanism and the agility in mitigating attacks.
Conferences

Optical Network Telemetry with Streaming Mechanisms using Transport API and Kafka

2021 European Conference on Optical Communication (ECOC2021)
We present a streaming mechanism for optical networks based on the Kafka architecture and protocols, to efficiently distribute state and network updates following the upcoming ONF Transport API streaming implementation agreement.
Conferences

First Demonstration of Dynamic Deployment of SDN-enabled WDM Virtual Network Topologies (VNTs) over SDM networks

  • Filippos Balasis
  • Ramon Casellas
  • Ricardo Martínez
  • Cen Wang
  • Noboru Yoshikane
  • Itsuro Morita
  • Takehiro Tsuritani
2021 European Conference on Optical Communication (ECOC2021)
We present the dynamic deployment of logical WDM VNTs by deploying virtual links between ROADM/OXC nodes using spatial channels provided by SDM networks.
Conferences

Demo paper: Scalable and Resilient Network Traffic Engineering Using Erlang-based Path Computation Element

2021 - VII IEEE Conference on Network Function Virtualization and Software Defined Networks (IEEE NFV-SDN 2021)
Scalability and resiliency are two significant requirements for upcoming beyond 5G networks. As network resource usage is expected to increase, scalability of the control plane handling the required amount of network resources is also necessary.
Journals

Field Trial of Programmable L3 VPN Service Deployment Using SDN-Based Multi-domain Service Provisioning over IP/Optical Networks

2021 - IEEE Network, Vol. 35, Issue 6, November/December 2021
Network operators cannot change their footprint to upgrade the entire network to support SDN from scratch. Hence, network operators adapted the original SDN concept into a hybrid SDN approach to have a pragmatic, evolutionary, and economically viable solution.