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, Connectivity requirements for a self-organizing vehicular network(2008-12-24); Pattara-Atikom, WasanIn order to facilitate the traffic information dissemination in a self-organizing vehicular network, the network connectivity is required. In other words, a message from a source vehicle should be able to propagate and reach all of the vehicles on the road segment. Clearly, this requires the road segment to have a certain number of vehicles equipped with communication devices. It is a 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 traffic information in a self-organizing vehicular network. Both one-way and two-way street scenarios are considered. © 2008 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A review of information dissemination protocols for vehicular ad hoc networks(2012-01-01); Pattara-Atikom, WasanWith the fast development in ad hoc wireless communications and vehicular technology, it is foreseeable that, in the near future, traffic information will be collected and disseminated in real-time by mobile sensors instead of fixed sensors used in the current infrastructure-based traffic information systems. A distributed network of vehicles such as a vehicular ad hoc network (VANET) can easily turn into an infrastructure-less self-organizing traffic information system, where any vehicle can participate in collecting and reporting useful traffic information such as section travel time, flow rate, and density. Disseminating traffic information relies on broadcasting protocols. Recently, there have been a significant number of broadcasting protocols for VANETs reported in the literature. In this paper, we classify and provide an in-depth review of these protocols. © 2012 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, Exploiting wireless communication in vehicle density estimation(2011-07-01); Pattara-Atikom, WasanVehicle density is one of the main metrics used for assessing road traffic condition. High vehicle density indicates that traffic is congested. Currently, most vehicle density estimation approaches are designed for infrastructure-based traffic information systems. These approaches require detection devices such as inductive loop detectors or traffic surveillance cameras to be installed at various locations. Consequently, they are not appropriate for an emerging self-organizing vehicular traffic information system, where vehicles have to collect and process traffic information without relying on any fixed infrastructure. In this paper, we consider a few methods for estimating vehicle density based on the number of vehicles in the vicinity of the probe vehicle and the number of vehicles in a communication cluster. © 2011 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An analysis of GPS sampling rates required in travel time estimation(2009-12-01); Pattara-Atikom, WasanWith an emergence of vehicular ad hoc networks, it is highly likely that in the near future vehicles on the road will be used as mobile probes for collecting and distributing traffic information such as the travel time. Generally, the travel time on a road section can be estimated from the global positioning data collected by a mobile probe. The more frequent the positioning data are collected or sampled, the more accurate the travel time estimation is. However, the accuracy comes at the expense of a large storage space for keeping the data. In addition, in some systems where a mobile probe needs to send its positioning data to a server or other vehicles in real-time, using an overly high sampling rate can waste the radio channel bandwidth unnecessarily since excessive amount of data will be transmitted. In this paper, we determine the minimum collection rate of positioning data required to achieve the desired level of travel time estimation accuracy. Copyright © 2009 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.