Now showing items 1-20 of 32

  • 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, ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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
    Restricted access - publisher's policy
    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 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
  • 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 ...
  • Multicast delivery using opportunistic routing in wireless mesh networks 

    Darehshoorzadeh, Amir; Cerdà Alabern, Llorenç (2014-01-01)
    Article
    Open Access
    Opportunistic routing (OR) has been proposed to improve the efficiency of unicast protocols in wireless networks. In OR, an ordered set of nodes is selected as the next-hop potential forwarders. In this paper, we investigate ...
  • On the design of hybrid DRAM/SRAM memory schemes for fast packet buffers 

    García Vidal, Jorge; March Hermo, María Isabel; Cerdà Alabern, Llorenç; Corbal San Adrián, Jesús; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2004)
    Conference report
    Open Access
    We address the design of a packet buffer for future high-speed routers that support line rates as high as OC-3072 (160 Gb/s), and a high number of ports and service classes. We describe a general design for hybrid DRAM/SRAM ...