Panichpapiboon, Sooksan
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Panichpapiboon, Sooksan
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sooksan.pa@kmitl.ac.th
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Item type:Publication, Connectivity requirements for vehicular networks with single-hop broadcasting(2009-12-01); Pattara-Atikom, WasanIn a vehicular ad hoc network (VANET), an information can generally be disseminated by using either a multi-hop broadcasting protocol or a single-hop broadcasting protocol. While in our earlier work we analyze the connectivity requirements in a network that employs a multi-hop broadcasting protocol, in this paper we extend our analysis to model the connectivity in a network that uses a single-hop broadcasting protocol. Our goal is to develop a model that is able to describe the relationship among the flow rate, the broadcast rate, and the network connectivity. As an initial step, in this paper, we determine the fundamental relation between the flow rate and the network connectivity. ©2009 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of a neighbor-based vehicle density estimation scheme(2008-12-01); Pattara-Atikom, WasanVehicle density is one of the main metrics used for assessing the road traffic condition. A high vehicle density usually indicates that the traffic is congested. Currently, most of the vehicle density estimation approaches are designed for the infrastructure-based traffic information systems. These approaches require detecting devices such as inductive loop detectors or traffic surveillance cameras to be installed at various locations. Consequently, they are not suitable for an emerging self-organizing vehicular traffic information system, where the vehicles have to collect and process the traffic information without relying on any fixed infrastructure. In this paper, we consider a method for estimating the vehicle density based on the number of vehicles in the vicinity of the probe vehicle and evaluate its performance. © 2008 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Connectivity requirements for self-organizing traffic information systems(2008-12-05); Pattara-Atikom, WasanTo facilitate the dissemination of a time-critical information in a vehicular ad hoc network (VANET), immediate network connectivity is needed. In other words, a time-critical message from a source should be able to propagate and reach all of the vehicles on the road segment without any delay due to the unavailability of the vehicles to forward the message. Clearly, this requires the road segment to have a certain number of vehicles equipped with communication devices. It is the task of a system designer to determine the minimum number of vehicles (i.e., the minimum penetration) necessary to form a connected network as well as the critical transmission range required to provide such connectivity. In this paper, we present an analytical framework for determining the connectivity requirements in distributing the traffic information in a self-organizing vehicular network. One- and two-way street scenarios are considered. In addition to the conventional perspective on connectivity, where the characteristics of the wireless channel are often neglected, our analysis offers a new view by taking important physical-layer parameters, such as fading, propagation path loss, transmit power, and transmission data rate, into consideration. © 2008 IEEE.