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A technological overview of the community network

TitleA technological overview of the community network
Publication TypeJournal Article
Year of Publication2015
AuthorsVega, D, Baig, R, Cerdà-Alabern, L, Medina, E, Meseguer, R, Navarro, L
JournalComputer Networks
Pagination260 - 278
KeywordsCommunity network, Network characterisation, Resilience, Topology patterns, Wireless network
AbstractAbstract This work presents a technological analysis of, a free, neutral, and open-access community network. consists of more than 27,000 operational nodes, which makes it the world’s largest community network in terms of the number of nodes and coverage area. This paper describes the characteristics of the network, the link level topology, its growth over a decade, and its resilience in terms of availability and reachability of network nodes. Our study is based on open data published by regarding its nodes and wireless links, monitoring information, community database, and its web portal. The data includes historical information that covers the lifetime of the network. The scale and diversity of the network requires a separate analysis of the subsets of the entire dataset by area or by separating the core from the leaf nodes. This shows some degree of diversity in local characteristics caused by several demographic, geographic, technological, and network design factors. We focus on the following aspects: technological network diversity, topology characteristics, evolution of the network over time, analysis of robustness, and its effect on networking service availability. In addition, we analyse how the community, the technology used, the geographical region where the network is deployed, and its self-organised structure shape the network properties and determine its strengths and weaknesses. The study demonstrates that the community network is diverse in technological choices for hardware, link protocols, and channels and uses a combination of routing protocols yet provides a common private İP\} network. The graph topology follows a power-law distribution for links in regions up to a few thousand k m 2 , limited to the scope of wireless links. Network growth has two aspects: a geographic growth of the network core using long distance links with wireless or fibre, and the local growth in density with leaf low-cost leaf nodes. The resilience of the network derived from the nodes’ uptime and the structure of the graph varies across different regions with more fragile leafs than core nodes and diverse degrees of graph resilience to random failures or coordinated attacks, such as natural causes, depending on the network planning, structure, and maturity. The community network results from a loosely coupled and decentralised organic growth that exhibits large local differences, diverse growth, and maturity under a common community license and social network.
NotesCommunity Networks