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Publications by Type: Technical Reports

Pocket Switched Networks: Real-world mobility and its consequences for opportunistic forwarding
Citation key CHCDGS-PSNRMCOF-05
Author Chaintreau, Augustin and Hui, Pan and Crowcroft, Jon and Diot, Christophe and Gass, Richard and Scott, James
Year 2005
ISSN 1476-2986
Number 617
Month February
Note ID: UCAM-CL-TR-617
Institution University of Cambridge Computer Laboratory
Abstract Opportunistic networks make use of human mobility and local forwarding in order to distribute data. Information can be stored and passed, taking advantage of the device mobility, or forwarded over a wireless link when an appropriate contact is met. Such networks fall into the fields of mobile ad-hoc networking and delay-tolerant networking. In order to evaluate forwarding algorithms for these networks, accurate data is needed on the intermittency of connections. In this paper, the inter-contact time between two transmission opportunities is observed empirically using four distinct sets of data, two having been specifically collected for this work, and two provided by other research groups. We discover that the distribution of inter-contact time follows an approximate power law over a large time range in all data sets. This observation is at odds with the exponential decay expected by many currently used mobility models. We demonstrate that opportunistic transmission schemes designed around these current models have poor performance under approximate power-law conditions, but could be significantly improved by using limited redundant transmissions.
Bibtex Type of Publication Technical Report
Link to publication Link to original publication Download Bibtex entry

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