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Revealing patterns of opportunistic contact durations and intervals for large scale urban vehicular mobility

Revealing patterns of opportunistic contact durations and intervals for large scale urban vehicular mobility
Revealing patterns of opportunistic contact durations and intervals for large scale urban vehicular mobility
Opportunistic contact between moving vehicles is one of the key features in vehicular delay tolerant networks (VDTNs) thatcritically influences the design of routing schemes and the network throughput. Due to prohibitive costs to collect enough realistic contact recodes, to the best of our knowledge, little experiment work has been conducted to study the opportunistic contact patterns in large scale urban vehicular mobility environment. In this work, we carry out an extensive experiment involving tens of thousands of operational taxis in Beijing city. Based on studying this newly collected Beijing trace and the existing Shanghai trace, we find some invariant characteristics of the opportunistic contacts for large scale urban VDTN. Specifically, in terms of contact duration, we find that there exists a characteristic time point, up to which and including at least 80% of the distribution, the contact duration obeys an exponential distribution, while beyond which it decays as a power law one. This property is in sharp contrast to the recent empirical data studies based on human mobility, where the contact duration exhibits a power law distribution. In terms of contact interval, we find that its distribution can be modelled by a three-segmented distribution, and there exists a characteristic time point, up to which the contact interval obeys a power law distribution, while beyond which it decays as an exponential one. Our observations thus reveal fundamental patterns for large scale vehicular mobility, and further provide useful guidelines for the design of new urban VDTN' routing protocols and their performance evaluation.
urban vehicular mobility, contact interval, contact duration, mobility modeling
Li, Yong
0817e950-114f-47f3-aefe-74bf9ec0e2a3
Jin, Depeng
d5ef5d7e-82a7-4950-85cf-800fe7794cc5
Zeng, Lieguang
7c5984b7-b38d-44a1-a1f5-66f2b87e6ff9
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Li, Yong
0817e950-114f-47f3-aefe-74bf9ec0e2a3
Jin, Depeng
d5ef5d7e-82a7-4950-85cf-800fe7794cc5
Zeng, Lieguang
7c5984b7-b38d-44a1-a1f5-66f2b87e6ff9
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80

Li, Yong, Jin, Depeng, Zeng, Lieguang and Chen, Sheng (2013) Revealing patterns of opportunistic contact durations and intervals for large scale urban vehicular mobility. IEEE ICC 2013, Hungary. 09 - 13 Jun 2013. 5 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Opportunistic contact between moving vehicles is one of the key features in vehicular delay tolerant networks (VDTNs) thatcritically influences the design of routing schemes and the network throughput. Due to prohibitive costs to collect enough realistic contact recodes, to the best of our knowledge, little experiment work has been conducted to study the opportunistic contact patterns in large scale urban vehicular mobility environment. In this work, we carry out an extensive experiment involving tens of thousands of operational taxis in Beijing city. Based on studying this newly collected Beijing trace and the existing Shanghai trace, we find some invariant characteristics of the opportunistic contacts for large scale urban VDTN. Specifically, in terms of contact duration, we find that there exists a characteristic time point, up to which and including at least 80% of the distribution, the contact duration obeys an exponential distribution, while beyond which it decays as a power law one. This property is in sharp contrast to the recent empirical data studies based on human mobility, where the contact duration exhibits a power law distribution. In terms of contact interval, we find that its distribution can be modelled by a three-segmented distribution, and there exists a characteristic time point, up to which the contact interval obeys a power law distribution, while beyond which it decays as an exponential one. Our observations thus reveal fundamental patterns for large scale vehicular mobility, and further provide useful guidelines for the design of new urban VDTN' routing protocols and their performance evaluation.

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More information

Published date: June 2013
Venue - Dates: IEEE ICC 2013, Hungary, 2013-06-09 - 2013-06-13
Keywords: urban vehicular mobility, contact interval, contact duration, mobility modeling
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 350199
URI: http://eprints.soton.ac.uk/id/eprint/350199
PURE UUID: 96d39850-8b7f-4e24-a95d-5d0e99ba3160

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Date deposited: 19 Mar 2013 16:34
Last modified: 11 Nov 2019 20:58

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Contributors

Author: Yong Li
Author: Depeng Jin
Author: Lieguang Zeng
Author: Sheng Chen

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