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The Mobile Cloud Network is an emerging cost and capacity heterogeneous distributed cloud topological paradigm that aims to remedy the application performance constraints imposed by centralised cloud infrastructures. A centralised cloud infrastructure and the adjoining Telecom network will struggle to accommodate the exploding amount of traffic generated by forthcoming highly interactive applications...
Network Function Virtualization is a recent and significant development applied in cloud datacenters, which can help service providers manage network services more flexibly and economically than using middle-boxes. User requests may demand different numbers of services in a chain, where the related flows can be directed to different physical machines (PMs) hosting required virtual network functions...
This letter presents a Flow-Level Extension to OMNeT++ (FLEO) that allows a discrete event simulator to operate on flows of traffic, and so simulate larger networks for longer periods of time for a given set of computation and memory resources compared with packet-based simulation. FLEO simulations of link utilization are accurate to within 0.2% of a packet-based simulation, yet run 30 to 90 times...
Exascale networks are expected to comprise a significant part of the total monetary cost and 10-20% of the power budget allocated to exascale systems. Yet, our understanding of current and emerging workloads on these networks is limited. Left ignored, this knowledge gap likely will translate into missed opportunities for (1) improved application performance and (2) decreased power and monetary costs...
We propose a vertex-centric distributed resource orchestration algorithm for finding all feasible mappings of a service function chain in multi-domain networks. Simulation results show superior efficiency and scalability for computing large service function chain requests.
We propose to realize availability-aware service provisioning in EONs with FIPP-p-cycles and bandwidth-squeezed restoration. Simulation results show that the proposed schemes are more reliable and spectrum-efficient than the existing approach.
Data Center is a multifunctional infrastructure that consists of thousands of compute servers and network devices. The fat-tree topology is widely adopted because of its efficiency and safety. However, the fat-tree topology can not completely meet the time-varying communication needs from physical and virtual machines. 60 GHz wireless technology was then incorporated into data centers for its high...
In this paper, we study joint topology management and energy cooperation in cellular networks. The topology management scheme transfers users (traffic) from one base station (BS) to another BS by adjusting the cell- size of the BSs, and the energy cooperation scheme transfers harvested energy from one BS to another BS. We first formulate a joint topology management and energy cooperation problem which...
This paper presents transistor-level design of a 150 MHz bandwidth continuous-time (CT) ΔΣ modulator in a 0.85 V 28 nm CMOS process. Architectural-level design tradeoff for the high bandwidth requirement is discussed. A stand-alone DAC calibration scheme that suits the high-speed modulator is proposed for linearization. Simulation results show that the modulator achieves signal-to-noise-and-distortion...
This paper investigates malleable reservation (MR) for data-oriented requests to revitalize spectrum fragments in elastic optical networks. We formulate a mixed integer linear programming model and propose a time-efficient heuristic to solve the MR problem.
Software-Defined Networking not only addresses the shortcoming of traditional network technologies in dealing with frequent and immediate changes in cloud data centers but also made network resource management open and innovation-friendly. To further accelerate the innovation pace, accessible and easy-to-learn testbeds are required which estimate and measure the performance of network and host capacity...
To study scientific application different computing paradigm used. Simulation of tool base Grid infrastructure plays its roll for study of grid base computation. We introduce the here Grid computing paradigm for resource coordination over the global computation world. Resources management and scheduling of applications in such large-scale distributed systems is a complex undertaking in case of Grid...
In order to solve the rbuf blocking in concurrent multipath transfer, firstly, this paper analyzes the reason for receiving buffer blocking and the disadvantages of traditional retransmission policies. And then, it proposes an improved retransmission policy — RTX-CR (retransmission-congestion window and RTT), which can reduce rbuf blocking. The simulation indicates that the retransmission policy can...
Current conveyors are an important component for implementing non-Foster circuits such as negative capacitors and negative resistors. However, different topologies exist for implementing negative capacitance using a current conveyor, and the performance of such topologies can vary greatly. Therefore, this paper considers two competing realizations of negative capacitance using a current conveyor,...
A high performance design of a three-stage amplifier is presented in this paper using the Impedance Adapting Compensation (IAC). The circuit is designed in 0.35um CMOS technology with 3.3V voltage power supply. When driving a 150pF capacitive load, this amplifier achieves as high as 144dB dc gain,7.44MHz gain-bandwidth product (GBW) ,60°phase margin(PM),1.26V/us slew rate (SR) and 0.95mW power dissipation...
Dynamic circuit network (DCN) is one of the technologies in the Future Internet and it has been utilized in many world-wide test beds. DCN provides the on-demand virtual circuit (VC) service in which the user gives requirements, including the source, the destination, an amount of bandwidth, and the start and end times, to the DCN system through the Web page and the system automatically sets up and...
Compared with backup sharing in WDM networks, it is more complex and challenging to share backup resources in OFDM-based optical networks with elastic bandwidth allocation. We propose and evaluate conservative and agressive backup sharing policies.
Network virtualization has been proposed as a way to increase the flexibility of the Internet. This could enable the provisioning of many desired services in the current architecture and allow effective sharing and use of resources. Providing virtual networks (VNs) means that virtual nodes and links need to be embedded in the underlying shared infrastructure. This embedding process, where VNs with...
In this paper, a congestion-aware rerouting (CAR) scheme is proposed based on the fairness mechanism of RPR for better throughput. If all flows competing for the bandwidth of the congested link converge to the steady rate, we try to find an alternate path to gain more bandwidth than the current path for some traffic flow passing through the congested link. Meanwhile, the throughput of flows traversing...
As the interest on Network Virtualization continues to grow, so does the awareness of the many technical obstacles to transpose before the envisioned virtualized network environment may become a reality. A significant obstacle lies on the efficient assignment of virtual resources into physical ones. Performing the so-called mapping of a virtual network into a substrate network is a computationally...
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