Link Capacity Distributions and Optimal Capacities for Competent Network Performance

Link Capacity Planning for Fault Tolerant Operation in Hybrid SDN/OSPF Networks

Link capacity dimensioning is the periodic task where ISPs have to make provisions for sudden traffic bursts and network failures to assure uninterrupted operations. This provision comes in the form of link working capacities with noticeable amounts of headroom, i.e., spare capacities that are used in case of congestions or network failures. Distributed routing protocols like OSPF provide convergence after network failures and have proven their reliable operation over decades, but require overprovisioning and headroom of over 50%. However, SDN has recently been proposed to either replace or wo…

Delivering Gigabit Capacities to Passenger Trains Tales from an Operator on the Road to 5G

Delivering reliable and high-capacity Internet connectivity to high-speed train users is a challenge. Modern railway cars act as Faraday cages and a typical train consist comprises several hundreds of users moving at high velocity. Furthermore, with the global availability of fourth generation (4G) Long Term Evolution (LTE), user expectations have dramatically increased: it is expected to be online anytime and anywhere. Demand for mobile high-capacity is being driven by video and music streaming services, for lower latency and higher availability by gaming, and for more reliability and even up…

SINR模型下随机无线网络的网络编码容量

Network Coding Capacity of Random Wireless Networks under a SINR Model

以前的工作对随机有线和无线网络的网络编码容量集中在网络中的链路的容量是独立的情况下。在本文中，我们考虑了一个更现实的模型，无线网络建模随机几何图形的干扰和噪声。在该模型中，链路的容量不是独立的。采用耦合和鞅方法，我们表明，在温和的条件下，随机无线网络的网络编码容量仍然表现出集中行为的平均值的最小割。

End-to-End Capacities of Imperfect-Repeater Quantum Networks

The optimal performance of a communication network is limited not only by the quality of point-to-point channels, but by the efficacy of its constituent technologies. Understanding the limits of quantum networks requires an understanding of both the ultimate capacities of quantum channels and the efficiency of imperfect quantum repeaters. In this work, using a recently developed node-splitting technique which introduces internal losses and noise into repeater devices, we present achievable end-to-end rates for noisy-repeater quantum networks. These are obtained by extending the coherent and re…