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ECN thresholds have limited operational range and very strict scope. Lower thresholds exacerbate the queue underflow while higher thresholds increase the queueing delays. In this paper, an Adaptive ECN (A-ECN) marking scheme is proposed to enhance the performance of ECN. A-ECN can adaptively adjust ECN marking thresholds in different scenarios to achieve good generality. Therefore, network operators...
Data transfer duration accounts for a great proportion of job completion time in big-data systems. To reduce the time spent on data transfer, some traffic scheduling mechanisms at coflow-level are proposed recently. Most of them abstract datacenter networks as an ideal non-blocking big-switch, and the bottleneck is located at egress or ingress ports of end-hosts instead of in networks. Thus, they...
With the explosive growth of Internet traffic and the rapid development of network technology, content delivery has become a significant service in the current Internet. However, the existing content delivery solutions, such as peer-to-peer and content delivery network, have many insufficient aspects. Meanwhile, the collaboration between content delivery and network infrastructures has been considered...
Recently, there are significant advances in the areas of networking, caching and computing. Nevertheless, these three important areas have traditionally been addressed separately in the existing research. In this paper, we present a novel framework that integrates networking, caching and computing in a systematic way and enables dynamic orchestration of these three resources to improve the end-to-end...
We present FDALB, a flow distribution aware load balancing mechanism aimed at reducing flow collisions and achieving high scalability. FDALB, like the most of centralized methods, uses a centralized controller to get the view of networks and congestion information. However, FDALB classifies flows into short flows and long flows. The paths of short flows and long flows are controlled by distributed...
In this paper, a visible light communications (VLC) system prototype using OLED was realized and tested. Using simple DPPM technique and comparator, our prototype was able to transmit up to 127.5 kbps data rate using an OLED with only 7 kHz 3 dB modulation bandwidth. Exploiting the frequency response of OLED, we were able to achieve a better data rate to modulation bandwidth ratio than other recent...
In this paper, a visible light communications (VLC) system prototype using organic light emitting diode (OLED) with dimming support was realized and tested. Frequency response and driving range of OLED were measured and discussed. Considering practical applications of OLED, variable pulse position modulation (VPPM) signal was used to support data transmission under dimming condition. Our prototype...
Power scaling of narrow-linewidth thulium-doped fiber superfluorescent source with wavelength tunable from 1940∼2010nm is reported. The all-fiber superfluorescent source yielded 364W of output power at central wavelength of 1980nm with 3dB spectral bandwidth of 1.9nm.
We demonstrated a high-power narrow-linewidth thulium-doped all-fiber laser based on master-oscillator power-amplifier. The amplifier yielded 342 W of narrow-linewidth laser output at central wavelength of 2000.3 nm with 3 dB spectral bandwidth of 90 pm.
In present network, bandwidth is valuable resource that limits the enlargement and speed up of communication. Hardware price drops as nearly line speed while long distance transmit price stays stable for years. This trend directs the future network to exchange computation and storage with bandwidth. Service-Oriented Future Internet Architecture proposes to add computation and storage ability to service...
The virtual network embedding problem is mainly concerned with assigning virtual networks onto the substrate network reasonably and efficiently. This paper proposes a virtual network mapping algorithm combining greedy virtual node mapping and virtual link mapping based on the weighted multi-commodity flow (WMCF). The cost coefficient of the multi-commodity flow problem is weighted by the ratio of...
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