Llorenç Cerdà-Alabern

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This paper presents a measurement study of the topology and its effect on usage of Guifi.net, a large-scale community network. It focuses on the main issues faced by community network and lessons to consider for its future growth in order to preserve its scalability, stability and openness. The results show the network topology as an a typical high density(More)
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 sent along pre-determined paths, in OR an ordered set of candidates is selected for each next-hop. Upon each transmission, the candidates(More)
In this paper it is analyzed the topology of Guifi.net Wireless Community Network (WCN). WCN have emerged in recent years organized and deployed by the cooperation of its own customers. WCN keep parallelisms with the construction of the Internet, and seems logical to look for common characteristics among them. More specifically, it is investigated whether(More)
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 paths, in OR an ordered set of candidates is selected as the next-hop potential forwarders. The candidate selection is a key issue in OR and(More)
This paper proposes a handoff scheme in a wireless access network where IEEE802.11 is used as link layer protocol and Mobile IP as network layer protocol. The scheme uses triggers available from IEEE 802.11, together with packet buffering in the old Access Point and packet forwarding from the old to the new Access Point in order to provide a smooth handoff.(More)
Achieving QoS (Quality of Service) in Mobile Ad-hoc NETworks (MANET) has been a research topic in the last years. In this paper we describe a QoS reservation mechanism for Routing Ad-hoc Networks. The mechanism is targeted for sources requiring a bandwidth allocation. The mechanism is based on the knowledge of the bandwidth requirements of the neighbors of(More)
We address the channel assignment problem in a multi-radio mesh network that involves assigning channels to radio interfaces for eliminating the effect of wireless interference. Due to the insufficient number of frequency channels and available radios per node, interference is still present which limits the available bandwidth on wireless links and(More)
Channel assignment was extensively researched for multi-radio wireless mesh networks, but still challenging when comes to implementation. In this paper we propose a semi-dynamic and distributed channel assignment called SICA based on the game theory formulation. To the best of our knowledge this is the first game formulation of channel assignment which(More)
In this paper, we address the channel assignment problem in a multi-radio mesh network that involves assigning channels to radio interfaces for eliminating the effect of wireless interference. Due to the insufficient number of frequency channels and available radios per node, interference is still present which limits the available bandwidth on wireless(More)