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This paper proposes a Cognitive Radio system where primary users cooperate with the secondary users by performing the task of data transmission and channel monitoring simultaneously, using the proposed receiver and frame structures. The proposed system works beyond the sensing-throughput tradeoff, overcomes the hidden terminal problem of the secondary users and increases awareness of the primary users...
We aim at enhancing the Quality of Service (QoS) management in modern Internet applications that heavily rely on the quality of the underlying network. Our goal is to provide the application developers with mechanisms for specifying and controlling high-level, application-related QoS metrics, rather than the traditional low-level, network-related metrics like latency, throughput, packet loss, etc...
This paper proposes an RGBD cameras-based wireless environment prediction and presents an implementation of a proactive traffic control system using the prediction results. In millimeter-wave and terahertz communications, frame loss rate increases and throughput is decreased tremendously when pedestrians block line-of-sight paths. Such serious human blockage does not occur in microwave communications...
In this article, the chief research and analysis of the network performance measurement and its research trend in the world are introduced. The network measurement technologies are classified according to consultative layer and other method. Measurement technologies of network layer are emphasized. The advantages/disadvantages of the bandwidth measurement technologies and traffic measurement technologies...
With the increasing cloud popularity, substantial effort has been paid for the development of emerging elastic cloud services, consisting of different units distributed among virtual machines/containers in different clouds. Due to the software stack and deployment complexity in single and multi-cloud scenarios, developing and managing such services is impeded by a lack of tools and techniques for...
The cloud computing provides better management and utilization of underlying infrastructures with resource virtualization. However, most of existing load balance models are unable to meet the special requirements of business such as the imbalance of peak period, the impact of nonlinear cross between varieties of business. Thus the reliability, scalability and self-organization of service becomes a...
For many years network operators have struggled to maintain fragile, statically configured and extremely complex networks. The constant threat of viruses, malware, intruders and misconfigured devices has made the task even more difficult. The use of an Intrusion Detection System (IDS) has become a standard defense model in many networks, however they are expensive and difficult to maintain and further...
This work experimentally demonstrates how to control and manage user Quality of Service (QoS) by acting on the switching on-off of the optical Gigabit Ethernet (GbE) interfaces in a wide area network test bed including routers and GPON accesses. The QoS is monitored at the user location by means of active probes developed in the framework of the FP7 MPLANE project. The network topology is managed...
Nowadays Cooperative Network is drastically growing and applied in various applications such as Military, Hospital, and Police etc. In this paper Military application is taken as an example, analyzed the functionality of the cooperative network. Human wearable sensor devices are used to monitor the human motion within a Military Region. In this paper it is aimed to monitor and detect intruders [contradictory...
A volcano monitoring system plays a key role for launching emergency early warning, and the use of alternative technologies have proven their effectiveness in this setting, which is the case of wireless sensor networks. For surveillance systems, the real-time requirement is mandatory due to the need for immediate access to the signals derived from a natural disaster where the goal is safeguarding...
The paper presents the lessons learned during the test activity of LTE network in Telecom Italia Lab. The issues mainly regard the lack of low cost and flexible monitoring and test platforms easy to reconfigure and adapt to the diverse network interfaces. The paper presents the design guideline for the development of FPGA-based devices able to overcome the presented issues. Exploiríng the NetFPGA...
In Smart Grid applications, we need to access end devices for monitoring and control over varieties of communication media (e.g., wireless, wired and power-line communications). The Internet Protocol is useful because it can integrate those heterogeneous media by IP over X architecture. In this paper, we focus on the integration of RS485, an optimal communication media for facility networking in buildings,...
This paper presents new Software Defined Networking (SDN) control framework for Quality of Service (QoS) provisioning. The proposed SDN controller automatically and flexibly programs network devices to provide required QoS level for multimedia applications. Centralized control monitors state of the network resources and performs smart traffic management according to collected information. Beside QoS...
Parallel file systems are often characterized by a layered architecture that decouples metadata management from I/O operations, allowing file systems to facilitate fast concurrent access to file contents. However, metadata intensive workloads are still likely to bottleneck at the file system control plane due to namespace synchronization, which taxes application performance through lock contention...
With technology scaling, process, voltage, and temperature (PVT) variations pose great challenges on integrated circuit designs. Conventionally, LSI circuits are designed by adding pessimistic timing margin to guarantee "always correct" operations even under worst-case conditions. However, due to the increasing PVT variations, unacceptable larger design guard band should be reserved to avoid...
This paper presents a strategy to choose WiFi channels in urban areas. We consider (i) inter-channel interference where adjacent channels interfere with each other in WiFi systems and (ii) urban situations where many APs in different systems are deployed in an uncoordinated way. As it is often hard to identify the channel with less interference in such a situation, we present a channel scoring function...
Scale-out storage systems (SoSS) have become increasingly important for meeting availability requirements of web services in cloud platforms. To enhance data availability, SoSS rely on a variety of built-in fault-tolerant mechanisms, including replication, redundant network topologies, advanced request scheduling, and other failover techniques. However, performance issues in cloud services still remain...
Commercial cloud providers are increasingly offering high performance and GPU-enabled resources capable of facilitating e-Science applications. However, the limitations of a public cloud's internal network performance are well documented and can lead to the decision to use dedicated infrastructure over cloud resources for scientific applications. This paper explores the potential for improvement in...
Providing the programmable control interfaces, Software-Defined Network (SDN) enables agile network traffic control and configuration as well as shortens the network function deployment time. Despite the projected benefits of SDN, the abstractions toward the remote and centralized control tend to impose excessive control traffic overheads in order for the controller to acquire the global network visibility...
Given the rapid progress in wireless devices and the serious demands of higher communication rate, future solutions for wireless networks have to deal with these needs. Proposed solutions must take into account the limited spectrum resource while keeping the energy efficiency. So, a typical processing will realize a balanced trade off: max-throughput/minenergy consumption. In this paper, our contribution...
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