TimeRemap: stable and accurate time in vehicular networks

Authors:
Ryad Ben-El-Kezadri;Giovanni Pau
Affiliations:
University of California, Los Angeles and University Pierre et Marie Curie and University of Manouba;University of California, Los Angeles
Venue:
IEEE Communications Magazine
Year:
2010

Citing 4
Cited 0

Fine-grained network time synchronization using reference broadcasts

ACM SIGOPS Operating Systems Review - OSDI '02: Proceedings of the 5th symposium on Operating systems design and implementation
A framework for wireless LAN monitoring and its applications

Proceedings of the 3rd ACM workshop on Wireless security
Jigsaw: solving the puzzle of enterprise 802.11 analysis

Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
Fidelity and yield in a volcano monitoring sensor network

OSDI '06 Proceedings of the 7th USENIX Symposium on Operating Systems Design and Implementation - Volume 7

Quantified Score

Hi-index	0.25

Visualization

Abstract

One fundamental limit for synchronizing a packet trace is that the two measurement systems that can be used to timestamp the packets, the operating system and the network interface, have mutually exclusive properties. The OS clock can be stabilized over the long run but the OS timestamps are not accurate; the PHY times-tamps are accurate but they show a drift. To leverage the best features of both systems, we propose to stabilize the OS clock with a GPS and to remap the PHY timestamps over the OS/GPS time. This method is well suited for challenged scenarios like VANETs as no signaling is needed between nodes. We apply our approach to VANET monitoring and evaluate it on packet traces collected from our testbed. The results show that our solution reduces the mean synchronization error to 3 µs.