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In this paper, a low-profile microstrip monopole antenna with an ultrawide bandwidth (UWB) is proposed. Via holes, rectangular patches, and a tune stub connecting ground plate are employed to improve the gain and impedance bandwidth of the antenna. Meanwhile, the antenna is etched on a single-layer substrate lowering the cost and complexity of manufacturing process. HFSS software is used to design...
Network selection is a key technology to realize fair resource allocation and load balancing for converged multi-radio heterogeneous networks. In this paper, we propose a Multiple attribute decision making and Evolutionary Game Theory (MEGT) integrated network selection scheme. In MEGT, utility functions are designed appropriately to compute user QoS satisfaction of the candidate network. User preferences...
One of the main challenges of network virtualization is efficient mapping of virtual nodes and virtual links onto the substrate network resources, which is known as virtual network embedding (VNE) problem. This paper aims to increase the revenue and utilization of infrastructure provider as well as achieve efficiency mapping. Due to the NP-hard character of VNE, we model the VNE problem as an integer...
Most of the current researches in virtual network embedding field often assume that the VN requests are static. However, in practical cases, virtual network requests on substrate resources change dynamically over time. To support such dynamical feature, we model the VNE problem as a mixed linear programming problem and use multiple queues to store different types of virtual network requests respectively...
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 data centers in cloud computing have flexible mechanisms to lease compute resources, but provide little control mechanism to share network resource. Traffic flows from different tenants' VMs will competing network resource on the substrate network, thus can resulting in unpredictable performance degradation. This paper proposes an economic model for fair leasing the network resource between...
Network virtualization allows multiple virtual networks to coexist on a shared physical substrate infrastructure. As network virtualization becomes popular, the problem of efficiently mapping a virtual network while guaranteeing its survivability in the event of failures becomes increasingly important. In this paper, the reliability problem of virtual network is solved based on a node and link redundant...
Running multiple virtual networks over a real physical substrate is a promising way to provide agility in current data centers. However, such virtual networks may experience severely degraded performance due to the competing of network traffic on shared physical links. Based on the idea of the Stackelberg solution from non-cooperative game theory, this paper presents a hierarchical game theoretic...
The goal of data center networking is to interconnect a large number of servers with low equipment cost, high performance and balanced network capacity, and robustness to link and server failures. In this paper, we present a new network interconnection structure for data centers, which leverages largely low-cost commodity Ethernet switches to support the full aggregate bandwidth of the network. Our...
For future Internet, network virtualization provides the feasibility of running multiple routing architectures on a shared physical infrastructure. This paper presents the design and evaluation of a bandwidth allocation algorithm based on multi-commodity flow problem solver, which integrated with a traffic predictor. The basic idea of our design is that some failure in the MFP computation implies...
Running multiple virtual networks is a promising way to support diverse applications over a shared substrate. Despite being simple, a static division of bandwidth between virtual networks can be highly inefficient, while dynamic bandwidth allocation performs much better, but that is difficult to guarantee the stability. Based on the idea of the Stackelberg solution from noncooperative game theory,...
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