Telecommunication systems enabling real time navigation

2011 IEEE Intelligent Vehicles Symposium (IV)

2011

Self Cite

Real time information to vehicular users is proposing new challenging questions to which wireless systems designers are called to answer. Nowadays many vehicles are already equipped with devices able to connect to cellular networks, and to transmit and receive in real time traffic information through vehicle-to-infrastructure (V2I) communication. Focusing on the uplink transmission of real time measurements, this is leading to high costs in terms of network load and billing. In this work we discuss the opportunity to take advantage of vehicle-tovehicle (V2V) in addition to V2I communications to reduce the amount of data to be transmitted from vehicles to a remote control center, and thus also to reduce the resulting costs for transmissions over the cellular networks. Having in mind to allow a first understanding of the achievable advantages, we propose a simple mathematical model through which we discuss how many vehicles are necessary to guarantee an useful V2V communication and which are the advantages in terms of network load and, consequently, costs reductions for the V2I network.Index Terms-Vehicle-to-vehicle (V2V), vehicle-toinfrastructure (V2I), analytical model, traffic related services.

Section: Evaluation Of the Number Of V2i Transmissionsmentioning

confidence: 99%

Taking advantage of V2V communications for traffic management

2011 IEEE Intelligent Vehicles Symposium (IV)

2011

Self Cite

“…Moreover, since only the transmission of the coordinates of two points is needed from the navigation system to the control center, the amount of data transmitted in the uplink is very small, thus limiting costs and resource occupation. Following numerical considerations of [3], in this work 1000 road segments (if updates are needed in both directions, they count as two road segments) are supposed to be updated every 5 minutes. • For the multicast mode, a progressive coverage strategy is considered, consisting in the transmission to the on-board navigator of the information related to the most important roads at national level and regional level, and to the minor roads at local level only.…”

Section: Scenario and Transmission Strategiesmentioning

confidence: 99%

“…• For the multicast mode, a progressive coverage strategy is considered, consisting in the transmission to the on-board navigator of the information related to the most important roads at national level and regional level, and to the minor roads at local level only. Following numbers discussed in [3] and noting that not all road segments are congested at the same time, in this work 12000 road segments will be updated in average (corresponding to the 2% of about 300000 road segments practicable in two directions). Independently on the unicast or multicast communication technology, we assume the adoption of the transport protocol experts group (TPEG) technology [16] at the highest layers of the protocol pillar.…”

Section: Scenario and Transmission Strategiesmentioning

confidence: 99%

“…To let information technologies really impact on traffic management, real time information has to be communicated to vehicles on a real time basis, providing up-to-date personalized and scaled information related to traffic conditions and suggesting alternative routes in case of congestions [1] [2] [3]. Many efforts are underway from the academic community, automotive manufacturers and governments to face the challenges offered by new vehicular applications and services.…”

Section: Introductionmentioning

confidence: 99%

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Real Time Traffic Updates via UMTS: Unicast versus Multicast Transmissions

2011 IEEE Vehicular Technology Conference (VTC Fall)

2011

Real time traffic information systems represent a growing sector of the wireless communication industries. To provide traffic information to drivers in a short term, cellular systems represent the answer: on the one hand many vehicles are equipped with global positioning system (GPS) navigators integrating cellular devices; on the other a large percentage of people has smart phones integrating advanced positioning systems. In this paper we aim at evaluating the feasibility of real time traffic information transmission to drivers by exploiting the universal mobile telecommunication system (UMTS) as the enabling technology. In particular, we compare the performance in the downlink of a urban scenario of the UMTS adopted in unicast and multicast mode, in terms of service feasibility and impact on the capacity left for other services. Results, performed through a simulation platform integrating a vehicular simulator tool together with a UMTS network simulator, will show which between unicast and multicast has to be preferred as a function of the considered environment.

“…Vehicular networks and vehicle-to-vehicle (V2V) communications increase the interest of scientific and industrial communities in finding out new solutions for fast, reliable, and efficient data transfer [1]- [4]. At physical and medium access control (MAC) layer, IEEE 802.11p represents the actual standardized solution for communications in vehicular ad hoc networks (VANETs) [5]- [7].…”

Section: Introductionmentioning

confidence: 99%

On the exploitation of OFDMA properties for an efficient alert message flooding in VANETs

2013 IEEE International Conference on Communications (ICC)

Zabini

2013

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Vehicular ad hoc networks (VANETs) drive new challenging research issues at different layers of the protocol pillar, from physical to application. Focusing on the medium access layer, one of the most promising and not yet fully explored option is the adoption of orthogonal frequency division multiple access (OFDMA). Besides guaranteeing high spectral efficiency and effective resource allocation, it relies at the physical layer on orthogonal frequency division multiplexing, which allows repetitions of the same signals to be opportunistically combined at the receiver even if they are not perfectly synchronized. Exploiting this property, here we suggest and discuss the use of OFDMA for alert message flooding in VANETs to increase reliability and resource usage efficiency. The achievable benefit and the potential drawback (in terms of high delivery delay) are here assessed through a simple yet realistic model that allows to compare, in highway scenarios, OFDMA with carrier sensing multiple access/collision avoidance, currently adopted by IEEE 802.11p for distributed communications in high mobility scenarios.