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To support mobile users in contributing sensing data for making urban management decisions, in ShanghaiGrid, unified data gathering operations are to be performed. For citywide coverage, public vehicles accept data from surrounding users and hand over to computing center through wireless base stations (BSs) deployed in the city. Meanwhile, several among the vehicles are hired as relays, which assist...
ZigBee is a popular short-range wireless communication protocol and has been widely adopted by wireless sensor networks, which runs on the same 2.4G band with WiFi. When wireless sensor networks with WiFi nodes run on overlapped bands, their signals could generate interferences with each other, and then wireless sensor networks could detect WiFi signal in this situation. In this paper, we propose...
Wireless vehicular networks have received significant attention. As vehicles are increasingly equipped with onboard sensors, large-scale urban monitoring with vehicular networks becomes attractive. To facilitate better monitoring, it is highly desirable that sensory data of the vehicles can be gathered with high fidelity. Deploying wireless relays is a cost-effective approach for connection enhancement...
Reliable communications are essential for most applications in wireless sensor networks (WSNs). In traditional approaches, the per-hop and end-to-end (E2E) recovery schemes are widely used. These schemes, however, suffer from low E2E success rate and poor energy efficiency in large-scale real environments. Through empirical studies, in this paper we identify three major problems that hinder the efficient...
Jamming is a serious security threat to a wireless sensor network since the network relies on open wireless radio channel. A jamming attacker launches jamming attacks easily by transmitting high-power signals and all legitimate sensor nodes interfered by jamming signals suffer corrupted packet transmissions. More importantly, the jammer is typically strategic and chooses its jamming strategy in response...
The proliferation of low-power wireless communications and handheld devices has facilitated the development of pervasive systems for healthcare applications. This paper describes a body sensor network comprising a personal controller, various biosensors and actuators for pervasive healthcare. Various physiological parameters such as heart rate or blood oxygen level can be continuously monitored. The...
The proliferation of low-power wireless communications and handheld devices has facilitated the development of pervasive systems for healthcare applications. This paper describes a body sensor network comprising a personal controller, various biosensors and actuators for pervasive healthcare. Various physiological parameters such as heart rate or blood oxygen level can be continuously monitored. The...
The rapid advancement in wireless communications and mobile computing devices has opened a wide door for developing interesting mobile peer-to-peer multi-player games (MMGs). In this paper we study an important problem of game state update in MMGs. Based on the network coding theory, we design the shift coding algorithm. Shift coding is running on a finely regulated ring overlay and lets each node...
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