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Dense Wi-Fi and Bluetooth (BT) environments become increasingly common so that the coexistence issue between Wi-Fi and BT is imperative to solve. In this paper, we propose BlueCoDE, a coordination scheme for multiple neighboring BT piconets, to make them collision-free and less harmful to Wi-Fi. BlueCoDE reuses BT's existing PHY and MAC design, thus making it practically feasible. We implement a prototype...
Recently, the simultaneous usage of various wireless technologies, such as Wi-Fi, Bluetooth, ZigBee and so on, becomes common and the propensity tends to be more complicated with the prevalence of smart and IoT devices. Such technology increments, however, intensify challenging Cross-Technology Interference (CTI) issues in a shared wireless band. To circumvent the hurdle, we propose a way which minimizes...
The concurrent deployment of heterogeneous wireless networks such as Wi-Fi, Bluetooth, and ZigBee has led to the severe interference problems in the 2.4GHz ISM band. In particular, ZigBee networks are susceptible to the interferences from other wireless technologies; For example, strong Wi-Fi signals trigger false alarms to ZigBee device that is performing low power idle listening and cause appreciable...
This paper deals with the problem of severe wireless performance degradation when multiple wireless technologies are concurrently utilized in a same user device. This type of usage is already frequent in most smartphones and laptops, such as streaming Bluetooth audio while using a Wi-Fi download, and is more intensifying with IoT device deployment which triggers the coexistence of heterogeneous wireless...
Although using high-quality streaming services becomes more common on mobile devices, the increment of streaming quality, which generally requires the larger playback bandwidth, frequently incurs undesirable delays or jitters that hamper user experiences. Recent mobile devices usually equip multiple network interfaces and their concurrent utilization can be beneficial to retain the necessary bandwidth...
Modern mobile devices are equipped with multiple network interfaces, including 3G/LTE and WiFi. Bandwidth aggregation over LTE and WiFi links offers an attractive opportunity of supporting bandwidth-intensive services, such as high-quality video streaming, on mobile devices. However, achieving effective bandwidth aggregation in mobile environments raises several challenges related to deployment, link...
Due to replacement infeasibility, methods to extend the life-time of sensors have been an issue in Wireless Sensor Networks (WSNs) and these should consider network connectivity simultaneously. Controlling the sleep/awake of sensors is one simple way to reduce their energy consumption. However, this causes a network connectivity degradation by varying network connection topology. For this reason,...
Because of their economical operation and low environmental pollution, PHEVs (Plug-in Hybrid Electric Vehicles) are rapidly substituting gasoline vehicles. However, there still exist obstacles to proliferating their use, such as their relatively short driving range and long battery charging time. At the same time, it is recognized that the current increasing trend of PHEV use will have a serious impact...
We propose methods to estimate centrality in Smart-Grid Networks (SGNs) from the view of a flow-based approach. In several network categories, centrality metrics, such as degree, closeness and betweenness, have provided ways to investigate the importance or weakness of components. These well-known metrics utilize either non-global or shortest-path information. We mention several observations which...
In mobile opportunistic networks, we investigate the effect of infrastructures on content update process. In the network, an information provider continuously generates a time-sensitive content (e.g., news, twits or military commands) whose freshness decreases with time. This information is propagated to users throughout opportunistic contacts. Users prefer to have the more recently generated (i.e...
Mobile hand-held devices such as smart-phones and tablets have gained in popularity over recent years. However, this induces cellular networks to suffer severe traffic demands that are hard to accommodate. In this respect, utilizing the ad-hoc communication of devices (e.g., bluetooth) can be an alternative way to obtain information while reducing the network overhead. Until now, the application possibility...
Smart-grid technologies focus on the complex interactions between different components of the electricity grid, together with the computing, control and communication functionalities that will bring together this future smarter infrastructure. Investigating these complex dynamic interactions is crucial for the efficiency and robustness of the emerging smart grid.
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