Vehicles will be soon equipped with wireless communication systems enabling a variety of new serv... more Vehicles will be soon equipped with wireless communication systems enabling a variety of new services. At the basis of each service is the transmission of beacon messages that advertise of the vehicle presence. In this paper, we investigate long term evolution (LTE) as the enabling technology for vehicle to vehicle (V2V) beaconing, by exploiting: i) the direct device to device (D2D) communication provided by Release 12 of LTE; ii) the full duplex (FD) radio, which allows a wireless device to transmit and receive at the same time. Furthermore, we introduce a novel analytical framework to evaluate the resource occupation of the beaconing service in LTE and compare the results with those obtained using LTE for vehicle to infrastructure (V2I) communications.
2014 European Conference on Networks and Communications (EuCNC), 2014
ABSTRACT A virtual traffic light (VTL) is a mechanism that allows vehicles to autonomously solve ... more ABSTRACT A virtual traffic light (VTL) is a mechanism that allows vehicles to autonomously solve priorities at road junctions in the absence of fixed infrastructures (i.e., conventional traffic lights). To develop an effective VTL system, communication between vehicles is a crucial factor and can be handled either using cellular infrastructure or adopting a vehicle-to-vehicle (V2V) communication paradigm. In this paper we present the design, the implementation, and the field trial of a VTL which exploits V2V communications based on IEEE 802.11p. Specifically, we propose a decentralized algorithm, that adopts both broadcast signaling and unicast messages to assign priorities to the vehicles approaching intersections, thus preventing accidents and reducing traffic congestions. The algorithm has been tested both in a controlled laboratory environment and in a field trial with equipped vehicles.
In this paper the issue of networks interworking is faced with reference to UMTS cellular network... more In this paper the issue of networks interworking is faced with reference to UMTS cellular networks and IEEE 802.11 wireless local area networks. A feasible architectural solution of the integrated network is given and the possibility to serve by means of the WLAN technology also those voice calls that would be blocked by UMTS, in case of resource saturation, is investigated. The performance level provided by the integrated network in a realistic scenario is here assessed considering both IEEE 802.11a and the forthcoming IEEE 802.11e WLAN technologies for possible integration with UMTS
ABSTRACT Routing strategies deeply affect the performance of wireless ad hoc networks, in terms o... more ABSTRACT Routing strategies deeply affect the performance of wireless ad hoc networks, in terms of coverage, interference, and delay. In this work, we investigate the impact of different routing strategies on the overall amount of interference generated in a distributed ad hoc network with power control. To this end, we derive an analytical model for the evaluation of the performance in terms of mean value and variance of the interference when signal level power control is adopted and different routing strategies, based on long-hop and short-hop relay selections schemes, are considered. This model allows us to quantify the performance of the overall network in terms of interference, average number of hops and path efficiency. Numerical results have been also verified by simulations.
In this paper several strategies are presented aimed at reducing the burden of physical level sim... more In this paper several strategies are presented aimed at reducing the burden of physical level simulations within the context of network simulations, and their characteristics are discussed, both in terms of time efficiency and accuracy. The simulation of an IEEE802.11a network is also presented as a case study in order to highlight the peculiarities of each strategy and the impact on accuracy of correlation in both the time and frequency domains
The interworking of different radio access technologies aimed at providing always the best servic... more The interworking of different radio access technologies aimed at providing always the best service to mobile users is the future of wireless communications. Many researchers are already investigating appropriate architectural solutions, coexistence problems, common radio resource management algorithms and other topics concerning this issue. In this paper we illustrate a simulation platform developed in our research group to investigate the performance and to test new management strategies of such interworking networks. Our purpose, however, is not to show the details of our tool, that would be useless for the reader; we aim, on the contrary, at providing those researchers who are facing the realization of a similar simulation tool with the main general criteria to develop a flexible and efficient simulation platform.
In this paper we provide the outcomes of a measurement campaign aimed at characterizing the UMTS ... more In this paper we provide the outcomes of a measurement campaign aimed at characterizing the UMTS femtocell propagation in an indoor scenario. The accuracy of a commonly adopted estimator of the signal-to-noise ratio is discussed, then the minimum measurement interval needed to derive an accurate characterization of the average received power is discussed. Finally we compare the measurement outcomes with those predicted using ray tracing tools and analytical models, showing the achievable accuracy levels.
Vehicles will be soon equipped with wireless communication systems enabling a variety of new serv... more Vehicles will be soon equipped with wireless communication systems enabling a variety of new services. At the basis of each service is the transmission of beacon messages that advertise of the vehicle presence. In this paper, we investigate long term evolution (LTE) as the enabling technology for vehicle to vehicle (V2V) beaconing, by exploiting: i) the direct device to device (D2D) communication provided by Release 12 of LTE; ii) the full duplex (FD) radio, which allows a wireless device to transmit and receive at the same time. Furthermore, we introduce a novel analytical framework to evaluate the resource occupation of the beaconing service in LTE and compare the results with those obtained using LTE for vehicle to infrastructure (V2I) communications.
2014 European Conference on Networks and Communications (EuCNC), 2014
ABSTRACT A virtual traffic light (VTL) is a mechanism that allows vehicles to autonomously solve ... more ABSTRACT A virtual traffic light (VTL) is a mechanism that allows vehicles to autonomously solve priorities at road junctions in the absence of fixed infrastructures (i.e., conventional traffic lights). To develop an effective VTL system, communication between vehicles is a crucial factor and can be handled either using cellular infrastructure or adopting a vehicle-to-vehicle (V2V) communication paradigm. In this paper we present the design, the implementation, and the field trial of a VTL which exploits V2V communications based on IEEE 802.11p. Specifically, we propose a decentralized algorithm, that adopts both broadcast signaling and unicast messages to assign priorities to the vehicles approaching intersections, thus preventing accidents and reducing traffic congestions. The algorithm has been tested both in a controlled laboratory environment and in a field trial with equipped vehicles.
In this paper the issue of networks interworking is faced with reference to UMTS cellular network... more In this paper the issue of networks interworking is faced with reference to UMTS cellular networks and IEEE 802.11 wireless local area networks. A feasible architectural solution of the integrated network is given and the possibility to serve by means of the WLAN technology also those voice calls that would be blocked by UMTS, in case of resource saturation, is investigated. The performance level provided by the integrated network in a realistic scenario is here assessed considering both IEEE 802.11a and the forthcoming IEEE 802.11e WLAN technologies for possible integration with UMTS
ABSTRACT Routing strategies deeply affect the performance of wireless ad hoc networks, in terms o... more ABSTRACT Routing strategies deeply affect the performance of wireless ad hoc networks, in terms of coverage, interference, and delay. In this work, we investigate the impact of different routing strategies on the overall amount of interference generated in a distributed ad hoc network with power control. To this end, we derive an analytical model for the evaluation of the performance in terms of mean value and variance of the interference when signal level power control is adopted and different routing strategies, based on long-hop and short-hop relay selections schemes, are considered. This model allows us to quantify the performance of the overall network in terms of interference, average number of hops and path efficiency. Numerical results have been also verified by simulations.
In this paper several strategies are presented aimed at reducing the burden of physical level sim... more In this paper several strategies are presented aimed at reducing the burden of physical level simulations within the context of network simulations, and their characteristics are discussed, both in terms of time efficiency and accuracy. The simulation of an IEEE802.11a network is also presented as a case study in order to highlight the peculiarities of each strategy and the impact on accuracy of correlation in both the time and frequency domains
The interworking of different radio access technologies aimed at providing always the best servic... more The interworking of different radio access technologies aimed at providing always the best service to mobile users is the future of wireless communications. Many researchers are already investigating appropriate architectural solutions, coexistence problems, common radio resource management algorithms and other topics concerning this issue. In this paper we illustrate a simulation platform developed in our research group to investigate the performance and to test new management strategies of such interworking networks. Our purpose, however, is not to show the details of our tool, that would be useless for the reader; we aim, on the contrary, at providing those researchers who are facing the realization of a similar simulation tool with the main general criteria to develop a flexible and efficient simulation platform.
In this paper we provide the outcomes of a measurement campaign aimed at characterizing the UMTS ... more In this paper we provide the outcomes of a measurement campaign aimed at characterizing the UMTS femtocell propagation in an indoor scenario. The accuracy of a commonly adopted estimator of the signal-to-noise ratio is discussed, then the minimum measurement interval needed to derive an accurate characterization of the average received power is discussed. Finally we compare the measurement outcomes with those predicted using ray tracing tools and analytical models, showing the achievable accuracy levels.
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