Mobisteer: Using steerable beam directional antenna for vehicular network access

DMCA

Mobisteer: Using steerable beam directional antenna for vehicular network access (2007)

Cached

Download Links

Other Repositories/Bibliography

DBLP

by Vishnu Navda , Prabhu Subramanian , Kannan Dhanasekaran , Andreas Timm-giel , Samir R. Das

Venue:	in MOBISYS
Citations:	86 - 5 self

BibTeX

@INPROCEEDINGS{Navda07mobisteer:using,
    author = {Vishnu Navda and Prabhu Subramanian and Kannan Dhanasekaran and Andreas Timm-giel and Samir R. Das},
    title = {Mobisteer: Using steerable beam directional antenna for vehicular network access},
    booktitle = {in MOBISYS},
    year = {2007},
    pages = {192--205},
    publisher = {ACM}
}

OpenURL

Abstract

In this work, we investigate the use of directional antennas and beam steering techniques to improve performance of 802.11 links in the context of communication between a moving vehicle and roadside APs. To this end, we develop a framework called MobiSteer that provides practical approaches to perform beam steering. MobiSteer can operate in two modes – cached mode – where it uses prior radio survey data collected during “idle ” drives, and online mode, where it uses probing. The goal is to select the best AP and beam combination at each point along the drive given the available information, so that the throughput can be maximized. For the cached mode, an optimal algorithm for AP and beam selection is developed that factors in all overheads. We provide extensive experimental results using a commercially available eight element phased-array antenna. In the experiments, we use controlled scenarios with our own APs, in two different multipath environments, as well as in situ scenarios, where we use APs already deployed in an urban region – to demonstrate the performance advantage of using MobiSteer over using an equivalent omni-directional antenna. We show that MobiSteer improves the connectivity duration as well as PHY-layer data rate due to better SNR provisioning. In particular, MobiSteer improves the throughput in the controlled experiments by a factor of 2 – 4. In in situ experiments, it improves the connectivity duration by more than a factor of 2 and average SNR by about 15 dB.

Keyphrases

using steerable beam directional antenna vehicular network access connectivity duration beam combination situ experiment optimal algorithm roadside aps prior radio survey data different multipath environment performance advantage online mode situ scenario controlled scenario phy-layer data rate equivalent omni-directional antenna available information average snr beam selection urban region cached mode element phased-array antenna extensive experimental result practical approach controlled experiment idle drive directional antenna

DMCA