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Haggle Testbed: a Testbed for Opportunistic Networks
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datorteknik. (Communication Research)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datorteknik. (Communication Research)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datorteknik. (Communication Research)
2011 (Engelska)Ingår i: In Proceedings of the 7th Swedish National Computer Networking Workshop, 2011Konferensbidrag, Publicerat paper (Refereegranskat)
Ort, förlag, år, upplaga, sidor
2011.
Identifikatorer
URN: urn:nbn:se:uu:diva-155530OAI: oai:DiVA.org:uu-155530DiVA, id: diva2:426539
Projekt
HaggleTillgänglig från: 2011-06-23 Skapad: 2011-06-23 Senast uppdaterad: 2014-06-30
Ingår i avhandling
1. Opportunistic Networking: Congestion, Transfer Ordering and Resilience
Öppna denna publikation i ny flik eller fönster >>Opportunistic Networking: Congestion, Transfer Ordering and Resilience
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Opportunistic networks are constructed by devices carried by people and vehicles. The devices use short range radio to communicate. Since the network is mobile and often sparse in terms of node contacts, nodes store messages in their buffers, carrying them, and forwarding them upon node encounters. This form of communication leads to a set of challenging issues that we investigate: congestion, transfer ordering, and resilience.

Congestion occurs in opportunistic networks when a node's buffers becomes full. To be able to receive new messages, old messages have to be evicted. We show that buffer eviction strategies based on replication statistics perform better than strategies that evict messages based on the content of the message.

We show that transfer ordering has a significant impact on the dissemination of messages during time limited contacts. We find that transfer strategies satisfying global requests yield a higher delivery ratio but a longer delay for the most requested data compared to satisfying the neighboring node's requests.

Finally, we assess the resilience of opportunistic networks by simulating different types of attacks. Instead of enumerating all possible attack combinations, which would lead to exhaustive evaluations, we introduce a method that use heuristics to approximate the extreme outcomes an attack can have. The method yields a lower and upper bound for the evaluated metric over the different realizations of the attack. We show that some types of attacks are harder to predict the outcome of and other attacks may vary in the impact of the attack due to the properties of the attack, the forwarding protocol, and the mobility pattern.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2014. s. 45
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1148
Nyckelord
Opportunistic Networking, Congestion, Transfer Ordering, Resilience, Testbed, WISENET
Nationell ämneskategori
Datavetenskap (datalogi) Kommunikationssystem
Forskningsämne
Datavetenskap med inriktning mot datorkommunikation
Identifikatorer
urn:nbn:se:uu:diva-223492 (URN)978-91-554-8953-3 (ISBN)
Disputation
2014-06-09, Room 2446, Polacksbacken, Lägerhyddsvägen 2, Uppsala, 13:15 (Engelska)
Opponent
Handledare
Projekt
WISENET
Tillgänglig från: 2014-05-15 Skapad: 2014-04-22 Senast uppdaterad: 2018-01-11Bibliografiskt granskad

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Totalt: 668 träffar
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