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The myriad of sensor information that can be collected using smartphones, wearables and other IoT devices greatly benefits context-aware applications. These applications rely heavily on mobile devices, present in locations of interest, to offload raw or processed sensor data in order to accurately capture, recognize and classify the surrounding real-time context. However, continuous sensing and offloading...
With the ubiquity of mobile appliances, efficient wireless access has become an urgent need for mobile users. Efficient wireless access requires accurate radio signal maps. Unfortunately, most of solutions could not be applied to large-scale urban space. Crowdsensing schemes could leverage the smartphone to sense WiFi signals, but could not provide accurate map because of the intolerable noises in...
This paper proposed a visible light communication system (VLC) based on mobile devices. The transmitting and receiving units were realized by using the display screen and camera of the mobile device. The data were converted to screen code before transmission, and were captured by the camera and decoded from the screen code to original data. The proposed system can operate up to 80Mbps theoretically...
As mobile IP-access is becoming the dominant technology for providing wireless services, the demand for more spectrum for this type of access is increasing rapidly. Since IP-access can be used for all types of services, instead of a plethora of dedicated, single-service systems, there is a significant potential to make spectrum use more efficient. In this paper, the feasibility and potential benefit...
A range of applications call for a mobile client to continuously monitor others in close proximity. Past research on such problems has covered two extremes: It has offered totally centralized solutions, where a server takes care of all queries, and totally distributed solutions, in which there is no central authority at all. Unfortunately, none of these two solutions scales to intensive moving object...
In a wireless sensor network with mobile sinks, the maintenance of efficient data delivery structure often brings a large amount of control overhead, which may offset the benefit of introducing mobile sinks. In this paper, we propose a multi-stage data routing protocol (called MLRP) to address this problem. To reduce the protocol overhead, MLRP integrates layered Voronoi scoping and dynamic anchor...
Multi-robot systems have been widely used in various actual fields to perform specific tasks. In the robot system, path planning is a burning problem. To solve this challenging issue, we mainly study the problem of path planning between robots and robots, robots and robots systems. Three factors are taken into account in the paper: the robot autonomous model, the real-time detection of speed and the...
At present, many studies focus on the efficiency of handoff among different networks, while research on how to maintain the safety during registration process of handoff is not enough. Unfortunately, mobile node is vulnerable to various security threats and attacks when handover for being lack of protection. A security scheme based on the IPSec protocol which was combined with fast handoff signaling...
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