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Iñaki Ucar
Charles III University of Madrid
14Publications
3H-index
50Citations
Publications 14
Newest
#1Francesco Gringoli (University of Brescia)H-Index: 20
#2Pablo Serrano (Charles III University of Madrid)H-Index: 21
Last.Arturo Azcorra (Charles III University of Madrid)H-Index: 19
view all 5 authors...
The IEEE 802.11aa amendment standardised the Group Addressed Transmission Service (GATS), which extends 802.11 WLANs with a novel set of MAC mechanisms to support an effective and efficient multicast video service. The key challenge with GATS is the selection of the best scheme and its configuration for a given network scenario, as the standard does not provide any guidelines nor any assessment of the performance of each mechanism. Although some previous studies have addressed this challenge, th...
#1Iñaki UcarH-Index: 3
#2Bart SmeetsH-Index: 1
Last.Arturo AzcorraH-Index: 19
view all 3 authors...
The simmer package brings discrete-event simulation to R. It is designed as a generic yet powerful process-oriented framework. The architecture encloses a robust and fast simulation core written in C++ with automatic monitoring capabilities. It provides a rich and flexible R API (application programming interface) that revolves around the concept of trajectory, a common path in the simulation model for entities of the same type.
#1Iñaki UcarH-Index: 3
#2Edzer PebesmaH-Index: 30
Last.Arturo AzcorraH-Index: 19
view all 3 authors...
This paper presents an R package to handle and represent measurements with errors in a very simple way. We briefly introduce the main concepts of metrology and propagation of uncertainty, and discuss related R packages. Building upon this, we introduce the errors package, which provides a class for associating uncertainty metadata, automated propagation and reporting. Working with errors enables transparent, lightweight, less error-prone handling and convenient representation of measurements wit...
Simulation frameworks are important tools for the analysis and design of communication networks and protocols, but they can be extremely costly and/or complex (for the case of very specialized tools), or too naive and lacking proper features and support (for the case of ad-hoc tools). In this article, we present an analysis of three 5G scenarios using simmer, a recent R package for discrete-event simulation that sits between the above two paradigms. As our results show, it provides a simple yet ...
#1Arturo Azcorra (Charles III University of Madrid)H-Index: 19
#2Iñaki Ucar (Charles III University of Madrid)H-Index: 3
Last.Pablo Serrano (Charles III University of Madrid)H-Index: 21
view all 5 authors...
In this paper, we revisit the idea of putting interfaces to sleep during packet overhearing (i.e., when there are ongoing transmissions addressed to other stations) from a practical standpoint. To this aim, we perform a robust experimental characterisation of the timing and consumption behaviour of a commercial 802.11 card. We design μNap, a local standard-compliant energy-saving mechanism that leverages micro-sleep opportunities inherent to the CSMA operation of 802.11 WLANs. This mechanism is ...
#1Iñaki Ucar (Charles III University of Madrid)H-Index: 3
#2Carlos Donato (IMDEA)H-Index: 3
Last.Albert Banchs (Charles III University of Madrid)H-Index: 29
view all 6 authors...
Rate adaptation and transmission power control in 802.11 WLANs have received a lot of attention from the research community, with most of the proposals aiming at maximising throughput based on network conditions. Considering energy consumption, an implicit assumption is that optimality in throughput implies optimality in energy efficiency, but this assumption has been recently put into question. In this paper, we address via analysis, simulation and experimentation the relation between throughpu...
#1Christian Mannweiler (Bell Labs)H-Index: 8
#2Markus Breitbach (DT: Deutsche Telekom)H-Index: 3
Last.Jorge Rivas Sanchez (Atos)H-Index: 1
view all 8 authors...
This paper describes the status of the 5G NORMA architecture after the second design iteration. It integrates the control and data layer functions developed in the project into a harmonized mobile network architecture, applying the paradigms of adaptive (de-) composition and allocation of network functions (NFs), programmable network control, and end-to-end network slicing. The paper depicts the design of a multi-service management & orchestration layer with dedicated interfaces for mobile netwo...
#2Oriol Font-BachH-Index: 7
Last.Miquel Payaró LlisterriH-Index: 13
view all 12 authors...
Cloud-based radio access networks (C-RAN) are expected to face important challenges in the forthcoming fifth generation (5G) communication systems. For this reason, more flexible C-RAN architectures have recently been proposed in the literature, where the radio communication stack is partitioned and placed across different RAN nodes to tackle the 5G capacity and latency requirements. In this paper, we show that this functional split also supports energy efficiency, especially when it is combined...
#1Iñaki Ucar (Charles III University of Madrid)H-Index: 3
#2Carlos Donato (IMDEA)H-Index: 3
Last.Albert Banchs (Charles III University of Madrid)H-Index: 29
view all 6 authors...
Rate adaptation in 802.11 WLANs has received a lot of attention from the research community, with most of the proposals aiming at maximising throughput based on network conditions. Considering energy consumption, an implicit assumption is that optimality in throughput implies optimality in energy efficiency, but this assumption has been recently put into question. In this paper, we address via analysis and experimentation the relation between throughput performance and energy efficiency in multi...
#1Bart SmeetsH-Index: 1
#2Iñaki UcarH-Index: 3
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