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Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/6705
Title: Recognizing exponential inter-contact time in VANETs
Authors: Zhu, Hongzi
Fu, Luoyi
Xue, Guangtao
Zhu, Yanmin
Li, Minglu
Ni, Lionel M.
Keywords: Vehicular ad-hoc networks
Inter-contact time distribution
Exponential tail
Empirical data analysis
Issue Date: Mar-2010
Citation: Proceedings IEEE INFOCOM 2010, 14-19 March 2010, San Diego, CA, USA, p. 1-5
Abstract: Inter-contact time between moving vehicles is one of the key metrics in vehicular ad hoc networks (VANETs) and central to forwarding algorithms and the end-to-end delay. Due to prohibitive costs, little work has conducted experimental study on inter-contact time in urban vehicular environments. In this paper, we carry out an extensive experiment involving thousands of operational taxies in Shanghai city. Studying the taxi trace data on the frequency and duration of transfer opportunities between taxies, we observe that the tail distribution of the inter-contact time, that is the time gap separating two contacts of the same pair of taxies, exhibits a light tail such as one of an exponential distribution, over a large range of timescale. This observation is in sharp contrast to recent empirical data studies based on human mobility, in which the distribution of the inter-contact time obeys a power law. By performing a least squares fit, we establish an exponential model that can accurately depict the tail behavior of the inter-contact time in VANETs. Our results thus provide fundamental guidelines on design of new vehicular mobility models in urban scenarios, new data forwarding protocols and their performance analysis.
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URI: http://hdl.handle.net/1783.1/6705
Appears in Collections:CSE Conference Papers

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