Title: The frequency of CFVD speed report for highway traffic
Authors: Chang, Ming-Feng
Chen, Chi-Hua
Lin, Yi-Bing
Chia, Chung-Yung
Department of Computer Science
Keywords: traffic information;floating vehicle;CFVD
Issue Date: 10-Apr-2015
Abstract: The control signals of cellular networks have been used to infer the traffic conditions of the road network. In particular, consecutive handover events are being used to estimate the traffic speed. During traffic congestion, consecutive handover events may be rare because vehicles move slowly, and thus very few or no speed reports would be generated from the congested area.However, the traffic speed report rate during traffic congestion has not been investigated in the literature. In this paper, we present an analytic model to estimate the speed report rate from cellular network signaling in steady traffic conditions, that is, the traffic speed and flow are assumed constant. Real field trial data were used to validate our analytic model. In addition, computer simulations were conducted to study how speed reports are generated in dynamic traffic conditions when traffic speed and flow change rapidly. Our study indicates that in a typical cell of length 1.5km with a typical expected call holding time of 1min, no speed report was generated from a congested three-lane highway. Our study demonstrates that the lack of speed reports from consecutive handover events during rush hours indicates severe traffic congestion, and new methods that can estimate traffic speed from cellular network data during severe traffic congestion need to be developed. Copyright (c) 2013 John Wiley & Sons, Ltd.
URI: http://dx.doi.org/10.1002/wcm.2384
ISSN: 1530-8669
DOI: 10.1002/wcm.2384
Volume: 15
Begin Page: 879
End Page: 888
Appears in Collections:Articles