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Towards Automatic Phone-to-Phone Communication for Vehicular Networking Applications
"... Abstract—This paper explores direct phone-to-phone communication (via WiFi interface) among vehicles to support mobile sensing applications. Direct communication among drivers’ phones is important in improving data collection efficiency and sharing participatory sensing information in an inexpensive ..."
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Abstract—This paper explores direct phone-to-phone communication (via WiFi interface) among vehicles to support mobile sensing applications. Direct communication among drivers’ phones is important in improving data collection efficiency and sharing participatory sensing information in an inexpensive manner. We design a practical and optimized communication mechanism for direct phone-to-phone data transfer among drivers’ phones that strategically enables phone-to-phone and/or phone-to-WiFiAP communications by optimally toggles the phone between the normal client and the hotspot modes. We take advantage of the WiFi hotspot functionality on smartphones, and hence require neither involvement of participants nor changes to existing wireless infrastructure and protocols. An analytical model is established to optimize toggling between client and hotspot modes for optimal system efficiency. We fully implement this system on off-the-shelf Google Galaxy Nexus and Nexus S phones. Through a 35-vehicle 2-month deployment study, as well as simulation experiments using the real-world T-drive 9,211-taxicab dataset, we show that our solution significantly reduces data transfer delay time and maintains over 80 % efficiency under varying system parameters. We even achieve 90 % for parameter settings of the latest smartphones. I.
Cloud-Assisted Safety Message Dissemination in VANET-Cellular Heterogeneous Wireless Network
"... Abstract-In vehicular ad-hoc networks (VANETs), efficient message dissemination is critical to road safety and traffic efficiency. Since many VANET-based schemes suffer from high transmission delay and data redundancy, integrated VANETcellular heterogeneous network has been proposed recently and at ..."
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Abstract-In vehicular ad-hoc networks (VANETs), efficient message dissemination is critical to road safety and traffic efficiency. Since many VANET-based schemes suffer from high transmission delay and data redundancy, integrated VANETcellular heterogeneous network has been proposed recently and attracted significant attention. However, most existing studies focus on selecting suitable gateways to deliver safety message from the source vehicle to a remote server, while rapid safety message dissemination from the remote server to a targeted area has not been well studied. In this paper, we propose a framework for rapid message dissemination that combines the advantages of diverse communication and cloud computing technologies.
Spatio-temporal distributed background data storage and management system in VANETs
"... Abstract—With the advances in the development of embedded technology, wireless communication and VANETs, and the aware-ness that vehicles possess a vast amount of unused resources, new services and applications have been proposed recently. The emphasis of this paper is on describing an idea, related ..."
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Abstract—With the advances in the development of embedded technology, wireless communication and VANETs, and the aware-ness that vehicles possess a vast amount of unused resources, new services and applications have been proposed recently. The emphasis of this paper is on describing an idea, related work, and open research challenges of using parked vehicles as a spatio-temporal distributed storage system for large amounts of data. We have briefly surveyed different data storage and management techniques in VANETs in order to get directions for the implementation of our strategy. Open research challenges and system requirements, as well as future work are pointed out. I.
Towards Automatic Phone-to-Phone Communication for Vehicular Networking Applications
"... Abstract—This paper explores direct phone-to-phone com-munication (via WiFi interface) among vehicles to support mo-bile sensing applications. Direct communication among drivers’ phones is important in improving data collection efficiency and sharing participatory sensing information in an inexpensi ..."
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Abstract—This paper explores direct phone-to-phone com-munication (via WiFi interface) among vehicles to support mo-bile sensing applications. Direct communication among drivers’ phones is important in improving data collection efficiency and sharing participatory sensing information in an inexpensive man-ner. We design a practical and optimized communication mech-anism for direct phone-to-phone data transfer among drivers’ phones that strategically enables phone-to-phone and/or phone-to-WiFiAP communications by optimally toggles the phone between the normal client and the hotspot modes. We take advantage of the WiFi hotspot functionality on smartphones, and hence require neither involvement of participants nor changes to existing wireless infrastructure and protocols. An analytical model is established to optimize toggling between client and hotspot modes for optimal system efficiency. We fully implement this system on off-the-shelf Google Galaxy Nexus and Nexus S phones. Through a 35-vehicle 2-month deployment study, as well as simulation experiments using the real-world T-drive 9,211-taxicab dataset, we show that our solution significantly reduces data transfer delay time and maintains over 80 % efficiency under varying system parameters. We even achieve 90 % for parameter settings of the latest smartphones. I.
1The Role of Parked Cars in Content Downloading for Vehicular Networks
"... When it comes to content access using Inter-Vehicle Communication (IVC), data will mostly flow through Road Side Units (RSUs), deployed in our cities. Unfortunately, the RSU coverage is expected to be rather scattered. Instead of relying on RSUs only, the paper investigate the possibility of exploit ..."
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When it comes to content access using Inter-Vehicle Communication (IVC), data will mostly flow through Road Side Units (RSUs), deployed in our cities. Unfortunately, the RSU coverage is expected to be rather scattered. Instead of relying on RSUs only, the paper investigate the possibility of exploiting parked vehicles to extend the RSU service coverage. Our approach leverages optimization models aiming at maximizing the freshness of content that downloaders retrieve, the efficiency in the utilization of radio resources, and the fairness in exploiting the energy resources of parked vehicles. The latter is constrained so as not to excessively drain parked vehicle batteries. Our approach provides an estimate of the system performance, even in those cases where users may only be willing to lease a limited amount of their battery capacity to extend RSU coverage. Our optimization-based results are validated by comparing them against ns-3 simulations. Performance evaluation highlights that the use of parked vehicles enhances the efficiency of the content downloading process by 25%-35 % and can offload more than half the data traffic from RSUs, with respect to the case where only moving cars are used as relays. Such gains in performance come at a small cost in terms of battery utilization for the parked vehicles, and they are magnified when a backbone of parked vehicles can be formed. I.
1Governing Energy for Parked Cars
"... Abstract—Vehicular networks offer service coverage for ur-ban environments that would otherwise be too expensive for infrastructure-based networks to provide. While many services have already been proposed based on collaboration between moving cars, the inclusion of parked cars in these systems exte ..."
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Abstract—Vehicular networks offer service coverage for ur-ban environments that would otherwise be too expensive for infrastructure-based networks to provide. While many services have already been proposed based on collaboration between moving cars, the inclusion of parked cars in these systems extends their reach, coverage and stability. However, despite the presence of a large car battery, cars still suffer from limited energy availability when they are parked. Essentially, if there is not enough energy to power the system for the whole duration of the stop, energy must be saved by shutting down the services for part of the stop duration. In this paper, we propose an energy management framework that governs the energy provisioning of a service. Our governor guarantees the most effective energy utilization for the system, requiring minimum effort from the service designers to attach to the system. We demonstrate the effectiveness of our governor through simulation of our LoadingZones Internet connectivity service and the feasibility of the architecture through the evalu-ation of our prototype system. I.
ParkingMeter: Balancing Energy Savings and Service Availability
"... Vehicular networks offer service coverage for urban environ-ments that would otherwise be too costly for infrastructure-based networks to provide. While many services have al-ready been proposed based on collaboration between moving cars, the inclusion of parked cars in these systems extends their r ..."
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Vehicular networks offer service coverage for urban environ-ments that would otherwise be too costly for infrastructure-based networks to provide. While many services have al-ready been proposed based on collaboration between moving cars, the inclusion of parked cars in these systems extends their reach, coverage and stability. However, despite the presence of a large car battery, cars still suffer from limited energy availability when they are parked. In these diverse environments, many services may be of-fered and existing application-oriented energy management solutions fail to capture the complexity of optimizing energy for each individual service, while current service-oriented solutions fail to capture the interactions between services. In response, we propose ParkingMeter, an energy manage-ment framework that handles the provisioning of multiple services concurrently by fairly allocating energy to each ser-vice, guaranteeing the most effective energy utilization for the system. We demonstrate the effectiveness of Parking-Meter through simulation of three diverse services and the feasibility of the architecture through the evaluation of our prototype system.
