Variability in TCP round-trip times
Proceedings of the 3rd ACM SIGCOMM conference on Internet measurement
MAR: a commuter router infrastructure for the mobile Internet
Proceedings of the 2nd international conference on Mobile systems, applications, and services
Link-level measurements from an 802.11b mesh network
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
Measurements of In-Motion 802.11 Networking
WMCSA '06 Proceedings of the Seventh IEEE Workshop on Mobile Computing Systems & Applications
Jigsaw: solving the puzzle of enterprise 802.11 analysis
Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
Analyzing the MAC-level behavior of wireless networks in the wild
Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
A measurement study of vehicular internet access using in situ Wi-Fi networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Understanding congestion in IEEE 802.11b wireless networks
IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
Supporting vehicular mobility in urban multi-hop wireless networks
Proceedings of the 6th international conference on Mobile systems, applications, and services
Interactive wifi connectivity for moving vehicles
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
M2: using visible middleboxes to serve pro-active mobile-hosts
Proceedings of the 3rd international workshop on Mobility in the evolving internet architecture
Enhancing interactive web applications in hybrid networks
Proceedings of the 14th ACM international conference on Mobile computing and networking
Cabernet: vehicular content delivery using WiFi
Proceedings of the 14th ACM international conference on Mobile computing and networking
A measurement study of inter-vehicular communication using steerable beam directional antenna
Proceedings of the fifth ACM international workshop on VehiculAr Inter-NETworking
A measurement study of a commercial-grade urban wifi mesh
Proceedings of the 8th ACM SIGCOMM conference on Internet measurement
Mobility '08 Proceedings of the International Conference on Mobile Technology, Applications, and Systems
Constructing accurate, space-efficient, wireless coverage maps for vehicular contexts
Proceedings of the 4th Annual International Conference on Wireless Internet
R2D2: regulating beam shape and rate as directionality meets diversity
Proceedings of the 7th international conference on Mobile systems, applications, and services
DOME: a diverse outdoor mobile testbed
Proceedings of the 1st ACM International Workshop on Hot Topics of Planet-Scale Mobility Measurements
Feasibility of content dissemination between devices in moving vehicles
Proceedings of the 5th international conference on Emerging networking experiments and technologies
Augmenting mobile 3G using WiFi
Proceedings of the 8th international conference on Mobile systems, applications, and services
Assessing the VANET's local information storage capability under different traffic mobility
INFOCOM'10 Proceedings of the 29th conference on Information communications
Context-aware optimized information dissemination in large scale vehicular networks
Proceedings of the 3rd International Conference on PErvasive Technologies Related to Assistive Environments
Iterative design process for the development and testing of cooperative applications
SpringSim '10 Proceedings of the 2010 Spring Simulation Multiconference
Performance comparison of 3G and metro-scale WiFi for vehicular network access
IMC '10 Proceedings of the 10th ACM SIGCOMM conference on Internet measurement
Trace-based mobility modeling for multi-hop wireless networks
Computer Communications
Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conference
A campus-wide testbed over the TV white spaces
ACM SIGMOBILE Mobile Computing and Communications Review
A retrospective look at the UMass DOME mobile testbed
ACM SIGMOBILE Mobile Computing and Communications Review
Beyond deployments and testbeds: experiences with public usage on vehicular WiFi hotspots
Proceedings of the 10th international conference on Mobile systems, applications, and services
The impact of infostation density on vehicular data dissemination
Mobile Networks and Applications - Special issue on Wireless and Personal Communications
Evaluating perceptual video quality for mobile clients in 802.11n WLAN
Proceedings of the 8th ACM international workshop on Wireless network testbeds, experimental evaluation & characterization
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Using measurements from VanLAN, a modest-size testbed that we have deployed, we analyze the fundamental characteristics of WiFi-based connectivity between basestations and vehicles in urban settings. Our results uncover a more complex picture than previous work which was conducted in more benign settings. The interval between a vehicle coming into and going out of range of a basestation is often marred by intermittent periods of very poor connectivity. These "gray periods" are hard to reliably predict because their arrival is not signaled by metrics such as signal strength, loss rate, speed or distance from the basestation. At the same time, they also do not consistently occur at the same spot. Our analysis suggests that gray periods are not caused by the motion of the vehicle per se but by the variability in the urban radio environment combined with the vehicle traversing locations that are poorly covered by the basestation. We also find that knowledge of past connectivity can be used to identify regions where gray periods are more likely to occur as well as regions where the vehicle is likely to experience good connectivit.