A Transport-SDN application for incremental on-line network optimization

  • Dembeck L.
  • Ilchmann F.
  • Milbrandt J.

Today, off-line network planning tools are used to optimize transport networks from scratch. A set of pre-planned wavelength services is taken into account for routing optimization. Performing such optimization in an operational transport network may lead to the rerouting of a large amount of wavelengths per link followed by massive adjustments of optical power levels. Hence, an approach is needed that performs on-line optimization of an operational network in a continuous and incremental way, thus enabling a smooth migration towards always optimal routing. To implement such an optimization application, which is also vendor-independent, an open control framework like Transport - Software Defined Networking (T-SDN) is particularly suitable. Our T-SDN optimization application presented here runs on top of a SDN controller which - in turn - is communicating with the network elements. A demonstration environment has been developed to evaluate feasibility and benefits of such on-line network optimization. Beside the application, the demonstrator comprises an Alcatel-Lucent Proof-of-Concept T-SDN controller as well as an emulated transport network based on the Alcatel-Lucent 1830 Photonic Service Switch (PSS). For ease of demonstration, the current network topology and configuration are query results from the SDN controller and thus input parameters for our application. The application performs a continuous routing optimization which is aware of physical impairments of optical transmission. The goal of this incremental optimization process is to affect only a very small number of wavelengths per iteration thus limiting the impact of wavelength rerouting on the photonic layer. The process itself can either be controlled by the network operator or can be run periodically in background to determine inefficient routes and to find better alternatives. If a more efficient route was found, the new path information is posted to the SDN controller which has to implement the rerouting. Our application thus enables the permanent analysis of lightpath deployment in transport networks in order to increase resource utilization and reduce cost per service.

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...