Content Delivery and Storage in Wireless Networks Using Network Coding
Author
Guerrero, Juan
Term
4. term
Education
Publication year
2015
Submitted on
2015-06-03
Abstract
This thesis explores an alternative to centralized cloud services by distributing content across peer devices in wireless networks. Frequent joins and leaves of mobile peers make content management and protocol design challenging, particularly because redundancy must be restored when a peer disconnects to maintain reliability. The work uses network coding as a unified structure for both storage and communication, enabling nodes to maintain and repair data with a single code. It evaluates state-of-the-art repair techniques from distributed storage when applied to a limited set of peers that jointly preserve a file, and examines how these repairs perform over wireless channels. Protocols and software are designed and implemented, and repair sessions are measured (including time and number of packets). The results show that leveraging the broadcast nature of wireless links can reduce the number of transmissions needed to repair lost redundancy, pointing to more efficient peer-to-peer storage in mobile settings.
Denne afhandling undersøger et alternativ til centraliserede cloudtjenester ved at sprede indhold på tværs af peer-enheder i trådløse netværk. De hyppige til- og frakoblinger af mobile enheder gør styring af indhold og protokoldesign udfordrende, især fordi redundans skal gendannes, når en peer forsvinder, for at bevare pålideligheden. Arbejdet anvender netværkskodning som en fælles struktur til både lagring og kommunikation, så noder kan vedligeholde og reparere data med én samlet kode. Afhandlingen evaluerer state-of-the-art reparationsmetoder fra distribuerede lagringssystemer anvendt i et begrænset antal peers, der sammen opretholder en fil, og udforsker, hvordan disse reparationer fungerer over trådløse kanaler. Der udvikles protokoller og software, og der måles på reparationsforløb (bl.a. tidsforbrug og antal sendte pakker). Resultaterne viser, at man ved at udnytte trådløse kanalers broadcast-egenskab kan reducere antallet af transmissioner, som kræves for at reparere tabt redundans, hvilket kan gøre peer-to-peer lagring mere effektiv i mobile miljøer.
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Keywords