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Demand for Internet access from moving vehicles has been rapidly growing. Meanwhile, the overloading issue of cellular networks is escalating due to mobile data explosion. Thus, WiFi networks are considered as a promising technology to offload cellular networks. However, there pose many challenging problems in highly dynamic vehicular environments for WiFi networks. For example, connections can be...
Urban traffic congestions have become a financial and societal burden in many cities. Efficient traffic management solutions mitigating such congestions require a reliable modeling and estimation of traffic jams. In urban traffic, the modeling challenges are related to flow collisions and gridlocks created at intersections. In this paper, we propose a traffic light extended Cell Transmission Model...
The development and deployment of clean vehicles bring great potential of reducing transportation greenhouse gas (GHG) emission and dependency on fossil fuels. The net GHG reduction through clean vehicle systems is tightly linked to the electricity grid mix (for electrical cars and plugin hybrids) and fueling strategy (for cars using alternative fuels). Natural resources may also pose constraints...
In Vehicle Ad hoc Networks (VANETs), multi-hop broadcast is a key technique to disseminate emergency information such as Event-driven safety messages to warn drivers in case of dangerous events. When multiple vehicles receive an emergency message, packet collisions may occur if they rebroadcast the message simultaneously. In this paper we propose a power-control broadcast scheme based on studying...
The concept of ecology can be extended to the urban infrastructure as well when the infrastructure components are not analyzed individually but as an interlinked system, which then can be termed as `infrastructure ecology'. Urban infrastructure can be envisioned as an integrated network of four major infrastructure components, which are the water infrastructure, the energy infrastructure, the transportation...
The key of location privacy preserving is to protect the unlinkability between location and identity. Most of existing algorithms focus on location protection and identity protection separately. That will leads to decreased service quality, authentication, and auditability. In this paper, we propose a new algorithm which uses a variable-length anonymous communication path to protect the linkage between...
Privacy preserving in location-based service (LBS) has been an important issue in Vehicular Ad hoc Network (VANET). Traditional k-anonymity algorithm dealing with location privacy protecting problem does not consider vehicle's mobility and inner collaborator. In this paper, we propose a new algorithm which uses dynamic and mobile aware anonymous peer selecting algorithm to improve the anonymity and...
Providing Internet access on buses allow people to read news, check emails, watch sport games, and hence can greatly improve the quality of people's life. This paper proposes an adaptive routing protocol, called R-BUS for a bus network. R-BUS selects a route based on the link's lifetime and its communication signal quality. The protocol takes the bus mobility and the radio propagation model into account...
Data caching is an important technique in wireless ad hoc networks, where it can increase data availability and significantly improve the efficiency of information access by reducing the access latency and bandwidth usage. However, designing efficient caching algorithms is non-trivial when network nodes have limited memory. After analyzing the benefit function of DGA (distributed greedy algorithm)...
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