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This paper presents a seamless handover scheme for the IEEE WAVE (Wireless Access for Vehicular Environment) networks based on proactive caching of data packets. In the proposed scheme an On-broad Unit (OBU) uses the IEEE 802.11 disassociation message to inform the old Road-Side Unit (RSU) about its departure from the coverage area such that the old RSU can forward the buffered packets to candidate...
IEEE 802.15.4 low-rate WPAN defines GTS (Guaranteed Time Slot) allocation based on FCFS (First Come First Serve) basis. In case of an emergency traffic, however, it may be hard to receive time slots because of other traffic flows already in service. In this paper we propose an efficient way of allocating GTS to emergency data so that the emergency traffic can get time slots whenever they request....
With the fast proliferation of the mobile Internet, the wireless community has been increasingly looking for a framework that can provide seamless mobility. In this paper, we propose a fast cross-layer handover scheme based on movement prediction in mobile WiMAX environment. Prediction is achieved by auto-regressive integrated moving average (ARIMA(p,d,q))model. The orders of the model parameters...
IEEE 802.11-based Vehicular Ad Hoc Networks (VANETs) are becoming important in enhancing road traffic safety. Drivers can proactively detect and avoid unsafe situations using safety message disseminated by VANETs. There are two common dissemination techniques: event-triggered multi-hop relaying (flood) and periodic one-hop broadcast (beacon). A basic idea of Location Division Multiple Access (LDMA)...
Routing between a base station and a mobile station is one of the key issues that should be addressed in multi-hop cellular systems. It should also take into account maximization of the radio resource utilization of the entire system, in which the radio resource of each cell must be shared by the base station and relay stations. In this paper, we propose a joint bandwidth allocation and routing scheme...
Device driver is the most important software of operating system to interact with hardware devices. As an essential part of operating system, device drivers must be reliable and efficient, because wrong operation can make a fatal system error and hardware performance is depends on the device driver. Therefore, it must be developed carefully and considered to be difficult to develop. Previously, we...
With the fast proliferation of mobile Internet, the wireless community has been increasingly looking for a framework that can provide seamless mobility. In this paper, we propose a fast cross-layer handover scheme based on movement prediction in mobile WiMAX environment. Prediction is achieved by linear regression model with keeping track of the signal strength of mobile users. With the help of the...
Device drivers are software interfaces between software applications and hardware devices. As part of complex operating system, device drivers are considered extremely difficult to develop. They are usually developed in low-level programming languages, such as C, that cannot provide type safety and device semantics. The device driver developers must have an in-depth understanding of given hardware...
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