Now showing items 1-20 of 36

    • A conflict-free memory banking architecture for fast VOQ packet buffers 

      García Vidal, Jorge; Cerdà Alabern, Llorenç; Corbal San Adrián, Jesús; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2003)
      Conference report
      Open Access
      In order to support the enormous growth of the Internet, innovative research in every router subsystem is needed. We focus our attention on packet buffer design for routers supporting high-speed line rates. More specifically, ...
    • A DRAM/SRAM memory scheme for fast packet buffers 

      García Vidal, Jorge; March, Maribel; Cerdà Alabern, Llorenç; Corbal San Adrián, Jesús; Valero Cortés, Mateo (2006-05)
      Article
      Open Access
      We address the design of high-speed packet buffers for Internet routers. We use a general DRAM/SRAM architecture for which previous proposals can be seen as particular cases. For this architecture, large SRAMs are needed ...
    • A lightweight service placement approach for community network micro-clouds 

      Selimi, Mennan; Cerdà Alabern, Llorenç; Freitag, Fèlix; Veiga, Luis; Sathiaseelan, Arjuna; Crowcroft, Jon (2019-03)
      Article
      Open Access
      Community networks (CNs) have gained momentum in the last few years with the increasing number of spontaneously deployed WiFi hotspots and home networks. These networks, owned and managed by volunteers, offer various ...
    • A new multicast opportunistic routing protocol for wireless mesh networks 

      Darehshoorzadeh, Amir; Cerdà Alabern, Llorenç (Springer, 2011)
      Conference report
      Open Access
      Opportunistic Routing (OR) has been proposed to improve the efficiency of unicast protocols in wireless networks. In contrast to traditional routing, instead of preselecting a single specific node to be the next-hop ...
    • A technological overview of the guifi.net community network 

      Vega d'Aurelio, Davide; Baig Viñas, Roger; Cerdà Alabern, Llorenç; Medina Medina, Esunly; Meseguer Pallarès, Roc; Navarro Moldes, Leandro (2015-12-24)
      Article
      Open Access
      This work presents a technological analysis of guifi.net, a free, neutral, and open-access community network. Guifi.net consists of more than 27,000 operational nodes, which makes it the world’s largest community network ...
    • Adaptive channel assignment for wireless mesh networks using game theory 

      Amiri Nezhad, Maryam; Cerdà Alabern, Llorenç (Institute of Electrical and Electronics Engineers (IEEE), 2011)
      Conference report
      Open Access
      Channel assignment has been extensively researched for multi-radio wireless mesh networks, but it is still very challenging when it comes to its implementation. In this paper we propose a semi-dynamic and distributed channel ...
    • Analysis of guifi.net's topology: extension of results 

      Cerdà Alabern, Llorenç (2012-05-04)
      External research report
      Open Access
      This report extends the analysis carried out in a previous work [1] about the topology of guifi.net wireless community network. The main objective is validating the topology generator proposed in [1] for guifi.net like ...
    • Candidate selection algorithms in opportunistic routing based on distance progress 

      Darehshoorzadeh, Amir; Cerdà Alabern, Llorenç; Pla Boscà, Vicent (2015-01-01)
      Article
      Open Access
      Opportunistic routing (OR) is a new class of routing protocols that selects the next-hop forwarder on-the-fly. In contrast to traditionally routing, OR does not select a single node as the next-hop forwarder, but a set of ...
    • Closed form transient solution of continuous time Markov chains through uniformization 

      Cerdà Alabern, Llorenç (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering (ICST), 2013)
      Conference lecture
      Open Access
      This paper derives a mapping between a close form transient solution of a continuous time Markov chain (CTMC), and a close form transient solution of one of its uniformized discrete time Markov chains. This result is used ...
    • Design and implementation of high-performance memory systems for future packet buffers 

      García Vidal, Jorge; Corbal San Adrián, Jesús; Cerdà Alabern, Llorenç; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2003)
      Conference report
      Open Access
      In this paper, we address the design of a future high-speed router that supports line rates as high as OC-3072 (160 Gb/s), around one hundred ports and several service classes. Building such a high-speed router would raise ...
    • Distance progress based opportunistic routing for wireless mesh networks 

      Darehshoorzadeh, Amir; Cerdà Alabern, Llorenç (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Restricted access - publisher's policy
      Opportunistic Routing (OR) has been proposed to improve the performance of multihop wireless networks by exploiting its broadcast nature. In contrast to traditional routing, where traffic is sent along pre-determined ...
    • Enabling individually entrusted routing security for open and decentralized community networks 

      Neumann, Axel; Navarro Moldes, Leandro; Cerdà Alabern, Llorenç (Elsevier, 2018-10)
      Article
      Open Access
      Routing in open and decentralized networks relies on cooperation. However, the participation of unknown nodes and node administrators pursuing heterogeneous trust and security goals is a challenge. Community-mesh networks ...
    • Energy efficient cloud service provisioning: Keeping data center granularity in perspective 

      Sharifi, Leila; Cerdà Alabern, Llorenç; Freitag, Fèlix; Veiga, Luis (2016-06)
      Article
      Open Access
      The cost of power and its associated delivery are becoming significant factors in the total expenditure of large-scale data centers. Numerous techniques have been proposed to address the energy efficiency issue in cloud ...
    • Experimental evaluation of a wireless community mesh network 

      Cerdà Alabern, Llorenç; Neumann, Axel; Escrich, Pau (Association for Computing Machinery (ACM), 2013)
      Conference lecture
      Open Access
      Nowadays there are inexpensive WiFi devices that have fostered the deployment of wireless communities. Well known routing protocols used in the Internet do not fit well to time varying characteristic of wireless networks. ...
    • Experimental evaluation of BMX6 routing metrics in a 802.11an wireless-community mesh network 

      Cerdà Alabern, Llorenç; Neumann, Axel; Maccari, Leonardo (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference lecture
      Open Access
      Modeling the performance of Wireless Mesh Networks (WMN) is a task that has received a lot of attention and has produced a large body of related literature. Most of the times, such literature is based on analytic assumptions ...
    • Improving performance of QUIC in WiFi 

      Manzoor, Jawad; Cerdà Alabern, Llorenç; Sadre, Ramin; Drago, Idilio (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Open Access
      QUIC is a new transport protocol under standardization since 2016. Initially developed by Google as an experiment, the protocol is already deployed in large-scale, thanks to its support in Chromium and Google's servers. ...
    • Improving reactive routing on wireless multirate ad-hoc networks 

      Paoliello Guimarães, Rafael; Cerdà Alabern, Llorenç (2007)
      Conference report
      Open Access
      Traditional ad-hoc routing protocols typically choose minimum hop paths for transmissions. In a multi-rate environment, where nodes may elect between several transmission rates in order to accommodate different ...
    • Information-Centric Multi-Access Edge Computing Platform for Community Mesh Networks 

      Lertsinsrubtavee, Adisorn; Selimi, Mennan; Sathiaseelan, Arjuna; Cerdà Alabern, Llorenç; Navarro Moldes, Leandro; Crowcroft, Jon (Association for Computing Machinery (ACM), 2018)
      Conference report
      Restricted access - publisher's policy
    • Is there a case for parallel connections with modern web protocols? 

      Manzoor, Jawad; Sadre, Ramin; Drago, Idilio; Cerdà Alabern, Llorenç (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      Modern web protocols like HTTP/2 and QUIC aim to make the web faster by addressing well-known problems of HTTP/1.1 running on top of TCP. Both HTTP/2 and QUIC are specified to run on a single connection, in contrast to the ...
    • Modeling and comparison of candidate selection algorithms in opportunistic routing 

      Darehshoorzadeh, Amir; Cerdà Alabern, Llorenç (2011-09-15)
      Article
      Restricted access - publisher's policy
      Opportunistic Routing (OR) has been investigated in recent years as a way to increase the performance of multihop wireless networks by exploiting its broadcast nature. In contrast to traditional routing, where traffic is ...