Selected Publications

By providing especially tailored instances of a virtual network, network slicing allows for a strong specialization of the offered services on the same shared infrastructure. Network slicing has profound implications on resource management, as it entails an inherent trade-off between: (i) the need for fully dedicated resources to support service customization, and (ii) the dynamic resource sharing among services to increase resource efficiency and cost-effectiveness of the system. While the technology needed to support this paradigm is well understood from a system standpoint, its implications in terms of efficiency are still unclear. In this paper, we fill such a gap via an empirical study of resource management efficiency in network slicing . Building on substantial measurement data collected in an operational mobile network (i) we quantify the efficiency gap introduced by non-reconfigurable allocation strategies of different kinds of resources, from radio access to the core of the network, and (ii) we quantify the advantages of their dynamic orchestration at different timescales. Our results provide insights on the achievable efficiency of network slicing architectures, their dimensioning, and their interplay with resource management algorithms.
ACM Mobicom, 2018

Network slicing represents a new paradigm to operate mobile networks. With network slicing, the underlying infrastructure is “sliced” into logically separate networks which can be customized to the specific needs of their tenant. Hand-on experiments on this technology are essential to understand its benefits and limits, and to validate the design and deployment choices. While some network slicing prototypes have been built for the radio access networks (RANs), leveraging on the wide availability of radio hardware and open source software, there is currently no open source suite for end-to-end network slicing available to the research community. In this paper we fill this gap by developing an end-to-end network slicing protocol stack, POSENS, which relies on a slice-aware shared RAN solution. We design the required algorithms and protocols, and provide a full implementation leveraging on state-of-the-art software components.We validate the effectiveness of POSENS in achieving tenant isolation and network slices customization, showing that no price in performance is paid to this end. We believe that our tool will prove very useful to researchers and practitioners working on this novel architectural paradigm.
IEEE Wireless Communications Magazine (Special Issue: 5G Testing and Field Trials), 2018

Proceedings of the 13th International Conference on emerging Networking EXperiments and Technologies, 2017

News

CONTINUE READING

Recent Publications

More Publications

By providing especially tailored instances of a virtual network, network slicing allows for a strong specialization of the offered services on the same shared infrastructure. Network slicing has profound implications on resource management, as it entails an inherent trade-off between: (i) the need for fully dedicated resources to support service customization, and (ii) the dynamic resource sharing among services to increase resource efficiency and cost-effectiveness of the system. While the technology needed to support this paradigm is well understood from a system standpoint, its implications in terms of efficiency are still unclear. In this paper, we fill such a gap via an empirical study of resource management efficiency in network slicing . Building on substantial measurement data collected in an operational mobile network (i) we quantify the efficiency gap introduced by non-reconfigurable allocation strategies of different kinds of resources, from radio access to the core of the network, and (ii) we quantify the advantages of their dynamic orchestration at different timescales. Our results provide insights on the achievable efficiency of network slicing architectures, their dimensioning, and their interplay with resource management algorithms.
ACM Mobicom, 2018

Network slicing represents a new paradigm to operate mobile networks. With network slicing, the underlying infrastructure is “sliced” into logically separate networks which can be customized to the specific needs of their tenant. Hand-on experiments on this technology are essential to understand its benefits and limits, and to validate the design and deployment choices. While some network slicing prototypes have been built for the radio access networks (RANs), leveraging on the wide availability of radio hardware and open source software, there is currently no open source suite for end-to-end network slicing available to the research community. In this paper we fill this gap by developing an end-to-end network slicing protocol stack, POSENS, which relies on a slice-aware shared RAN solution. We design the required algorithms and protocols, and provide a full implementation leveraging on state-of-the-art software components.We validate the effectiveness of POSENS in achieving tenant isolation and network slices customization, showing that no price in performance is paid to this end. We believe that our tool will prove very useful to researchers and practitioners working on this novel architectural paradigm.
IEEE Wireless Communications Magazine (Special Issue: 5G Testing and Field Trials), 2018

5G network technologies are evolving in a tremendous pace, enhancing the potential for being adopted and exploited by vertical industries and serve advance networking requirements needs. Towards this direction, a set of 5G PPP projects are providing contributions for tackling aspects related to the overall lifecycle of 5G vertical applications design, development and deployment, including the activation and management of the appropriate network services. In this paper, a cartography of a set of novel solutions facilitating the adoption of 5G technologies by vertical industries is presented, aiming at identifying set of challenges and relevant solutions as well as potential synergies among the related projects.
2018 European Conference on Networks and Communications (EuCNC), 2018

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.
2018 IEEE International Conference on Communications (ICC), 2018

Abstract We are currently observing the softwarization of communication networks, where network functions are translated from monolithic pieces of equipment to programs running over a shared pool of computational, storage, and communication resources. While it is clear that almost any softwarization improves flexibility (eg, the ability to instantiate more servers to cope with increasing traffic demand), in this paper, we advocate for a complete redesign of the communications protocol stack, instead of a mere translation of hardware functions into software. We discuss 2 drivers for this cloud-aware redesign: (1) relaxing the tight interactions between functions and (2) supporting a graceful degradation of the service when resources become scarce. The potential benefits of this redesign are illustrated with the numerical evaluation of one use case.
Transactions on Emerging Telecommunications Technologies, 2018

Summary This chapter reviews the trends in the end-to-end (E2E) architectural design for 5th generation (5G) networks. It describes the high-level ideas behind the common architectural trends, with a first definition of their common capabilities and how they can be leveraged to provide the enhanced key performance indicators (KPIs) expected by 5G networks. The chapter describes the common requirement and design principles that drive the current efforts in both standardization and research. It explains how the E2E architecture looks like, with the description of the main modules and which fundamental technical problems they will solve. The chapter explores the open issues on E2E architecture and a possible migration path. It introduces some of the novel enablers that will be a fundamental part of future 5G networks and the associated requirements. The chapter talks about how the current radio access network (RAN) and core architectures can be migrated to the future architectures.
5G System Design, 2018

Vertical markets and industries are addressing a large diversity of heterogeneous services, use cases, and applications in 5G. It is currently common understanding that for networks to be able to satisfy those needs, a flexible, adaptable, and programmable architecture based on network slicing is required. Moreover, a softwarization and cloudification of the communications networks is already happening, where network functions (NFs) are transformed from monolithic pieces of equipment to programs running over a shared pool of computational and communication resources. However, this novel architecture paradigm requires new solutions to exploit its inherent flexibility. In this paper, we introduce the concept of resource elasticity as a key means to make an efficient use of the computational resources in 5G systems. Besides establishing a definition as well as a set of requirements and key performance indicators (KPIs), we propose mechanisms for the exploitation of elasticity in three different dimensions, namely computational elasticity in the design and scaling of NFs, orchestration-driven elasticity by flexible placement of NFs, and slice-aware elasticity via cross-slice resource provisioning mechanisms. Finally, we provide a succinct analysis of the architectural components that need to be enhanced to incorporate elasticity principles.
2018 IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2018

2018

Reliable and reproducible research in vehicular networking demands, among other requisites, a suitable representation of road traffic. We leverage real-world fine-grained measurement data recorded on the M40 highway in Madrid, Spain, to feed a realistic and properly parameterized microscopic simulation of vehicular mobility. The output is the first dataset of bidirectional highway traffic that is publicly accessible to the vehicular networking community. We leverage the dataset to demonstrate the validity in a complete highway scenario of the three-phase law of vehicular network connectivity, previously proven only on single carriageways.
2017 IEEE Vehicular Networking Conference (VNC), 2017

Proceedings of the 13th International Conference on emerging Networking EXperiments and Technologies, 2017

Recent & Upcoming Talks

Privacy in personal trajectories: problems and solutions
May 10, 2018 19:00

Teaching

Contact