An empirical study of short range communications for vehicles

Wu, Hao; Palekar, Mahesh; Fujimoto, Richard M.; Guensler, Randall; Hunter, Michael; Lee, Jaesup; Ko, Joonho

doi:10.1145/1080754.1080769

Cited by 31 publications

(25 citation statements)

References 5 publications

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“…Measurement studies in this context have analyzed the impact of LOS communication in varied environments [28], and noted that maintaining LOS is a significant factor in communication [29]. Another study of single-(I2V) and multi-hop (I2V/V2V hybrid) communications conducted on a highway specifically calls for analysis of factors such as environment, weather, and other vehicles in signal propagation [30]. Other work characterized propagation in open field and highway environments for the DSRC band using the Nakagami model [31].…”

Section: Related Workmentioning

confidence: 99%

Down the Block and Around the Corner The Impact of Radio Propagation on Inter-vehicle Wireless Communication

Otto

Bustamante

Berry

2009

2009 29th IEEE International Conference on Distributed Computing Systems

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Vehicular networks are emerging as a new distributed system environment with myriad possible applications. Most studies on vehicular networks are carried out via simulation, given the logistical and economical problems with largescale deployments. This paper investigates the impact of realistic radio propagation settings on the evaluation of VANET-based systems. Using a set of instrumented cars, we collected IEEE 802.11b signal propagation measurements between vehicles in a variety of urban and suburban environments. We found that signal propagation between vehicles varies in different settings, especially between lineof-sight ("down the block") and non line-of-sight ("around the corner") communication in the same setting. Using a probabilistic shadowing model, we evaluate the impact of different parameter settings on the performance of an epidemic data dissemination protocol and discuss the implications of our findings. We also suggest a variation of a basic signal propagation model that incorporates additional realism without sacrificing scalability by taking advantage of environmental information, including node locations and street information.

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Section: Related Workmentioning

confidence: 99%

Down the Block and Around the Corner The Impact of Radio Propagation on Inter-vehicle Wireless Communication

Otto

Bustamante

Berry

2009

2009 29th IEEE International Conference on Distributed Computing Systems

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“…Using 802.11-based systems, transport layer throughput and packet loss measurements were conducted by Wu and colleagues [14] for vehicle-to-vehicle and vehicle-to-roadside communications, by Hui and colleagues in [15], [3] with a special emphasis on multi-hop routing over vehicles, and by Ott and Kutscher [16] for vehicle-to-roadside communications. These studies characterize throughput, latency, and packet loss at the transport layer.…”

Section: Background and Related Workmentioning

confidence: 99%

Effect of Antenna Placement and Diversity on Vehicular Network Communications

Kaul

Ramachandran

Shankar

et al. 2007

2007 4th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks

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Abstract-In this paper we present empirical results from a study examining the effects of antenna diversity and placement on vehicle-to-vehicle link performance in vehicular ad hoc networks. The experiments use roofand in-vehicle mounted omni-directional antennas and IEEE 802.11a radios operating in the 5GHz band, which is of interest for planned inter-vehicular communication standards. Our main findings are two-fold. First, we show that radio reception performance is sensitive to antenna placement in the 5Ghz band. Second, our results show that, surprisingly, a packet level selection diversity scheme using multiple antennas and radios, Multi-Radio Packet Selection (MRPS), improves performance not only in a fading channel but also in line-of-sight conditions. This is due to propagation being affected by car geometry, leading to the highly non-uniform antenna patterns. These patterns are very sensitive to the exact antenna position on the roof, for example at a transmit power of 40mW the line-of-sight communication range varied between 50 and 250m depending on the orientation of the cars. These findings have implications for vehicular MAC protocol design. Protocols may have to cope with an increased number of hidden nodes due to the directional antenna patterns. However, car makers can reduce these effects through careful antenna placement and diversity.

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“…Work has also been carried out analysing the theoretical [14][12] and practical [4] performance for intervehicular networks. This again has centred around IEEE 802.11b, mostly in motorway environments.…”

Section: Related Workmentioning

confidence: 99%

Performance of IEEE 802.11a in Vehicular Contexts

Cottingham

Wassell

Harle

2007

2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring

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A key component of intelligent transportation is the provision of adequate network infrastructure to support vehicleto-vehicle and vehicle-to-roadside communication. In this paper we report on performance evaluations carried out using the IEEE 802.11a protocol at 5.2 GHz between a moving vehicle and a fixed base station. We concentrate our evaluation on realistic urban speeds and environments, observing that performance at very low speeds is degraded due to the presence of null zones. We vary the modulation scheme and analyse the spread of resulting throughputs. Our results have implications for multimedia and other real-time applications that will utilise vehicle-to-roadside connectivity.

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An empirical study of short range communications for vehicles

Cited by 31 publications

References 5 publications

Down the Block and Around the Corner The Impact of Radio Propagation on Inter-vehicle Wireless Communication

Down the Block and Around the Corner The Impact of Radio Propagation on Inter-vehicle Wireless Communication

Effect of Antenna Placement and Diversity on Vehicular Network Communications

Performance of IEEE 802.11a in Vehicular Contexts

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