Overview

This seminar focuses on research issues in software-defined networking (SDN), which currently evolves into a paradigm shift in how we build and manage computer networks. Here are a few links to introductions:

• a definition at the Open Networking Foundation and their blog entry
• the original research paper proposing OpenFlow, the most popular SDN implementation
• Scott Shenkers presentation gives some background story and a good overview
• and a more intellectual introduction is available from ACMQueue

You will be able to practice working on current research literature, presenting a scientific topic, and your programming ability. The latter is crucial for your grade as all presentations have to be supported by an interactive visualization of an important aspect of your paper.

As a prerequisite, we assume students of the seminar have basic knowledge on computer networks and good English proficiency. Literature and presentations will be in English.

Deliverables

1) Presentation

• prepare slides for a presentation of 30 minutes (+/-2 minutes) + presenting your interactive visualization in about 5 minutes, and a Q&A of about 10 minutes (for a total of 45 minutes)
• use academic slide guidelines as in "How to prepare and deliver a presentation"
• plain, high-contrast slides, e.g., by using one of the disco templates
• spell check your English

2) Interactive Visualization

The visualization should

• focus on one (or a limited few) aspects of your paper
• be interactive
• be coded by yourself, but you may use library support without restrictions.

Here are some simple animation libraries for HTML5+JS:

• Move.js gives straightforward code for moving objects
• a piece of pure JS code, which randomly moves a dot about
• oCanvas brings object orientation to your canvas and JS, check out their example section
• EaselJS aims to simplify working with HTML5 canvases
• or, consider to plot your data with dygraphs

You may also use Java Applets/ ... whatever runs in a major browser (best case: without requiring plugins).

3) Related Work Section

• describe the context of the papers you'll present
• 1500 - 2000 words, 2-5 pages
• use the Latex IEEEtran template in the conference format (bare_conf)
• you should cite about 10-15 papers (ask your advisor)

Seminar Topics and Deadlines

Group 1 (Presentations on December 15 in 36-265)

Group 2 (Presentations on January 12 in 36-336)

Group 3 (Presentations on Januaray 19 in 36-336)

*(acc. req. uni-IP)* indicates that there is no open-access version of this paper available. The link goes to a publisher, which either requires you to pay or to use the university subscription. The later is free of charge - however, this only works if you're connecting to the server from within the university IP range (e.g., by using Eduroam WiFi, one of the terminal-room computers, or a VPN connection).

News

Some new slides for short-term performance management  are online. 

The exercises will be on Thursday 11:45 - 13:15 in room 36/438.

IMPORTANT: we changed the class room to 36/438!

Course Overview

The objective of this lecture is to introduce the basics of performance managment in communication networks on multiple time-scales. The contents are as follows:

Organization

Lecture Slides

Exercise Sheets

We strongly recommend you to work on the exercises, since they are crucial to get a good grasp on math-affine lectures.

We recommend to go to the exercises fully prepared, meaning: you should be able to present your solutions to the other students on the blackboard.

For programming exercises we recommend the usage of the statistical software R (see http://www.r-project.org/)

Literature

• TBD

Content

• Smart Systems
• Wireless Sensor Networks
• Communication Systems
• Performance Analysis

Project Description

Wireless sensor networks (WSNs) are increasingly used for monitoring, automation and control in cyber-physical systems such as industrial facilities. There, a WSN usually reports sensory data to a central control instance — a safety-critical task that requires predictable network performance in order to timely detect potentially hazardous deviations from normal operation.

Predicting the the actual performance of a WSN is hard. It highly depends on application requirements and the derived network setting. On the one hand, it might be necessary to have separate sensors for different tasks such as temperature monitoring of an area or reporting of a machine’s log data. Furthermore, some properties are to be captured by multiple sensors simultaneously in order to identify a single sensor’s misbehavior and to prevent erroneous conclusions. Thus, such wireless networks are usually dense and impose a high communication workload on nodes, high contention on the medium and increasing transmission delays on data flows.

Obviously, the setting derived from the application requirements (sensor density, sensor distribution, sensing frequency, etc.) will make compliance with strict real-time requirements difficult. Therefore, we will approach the design of WSNs as well as their performance evaluation in the PEDS project. The goal is to learn the basics of modeling WSNs, especially the use of their shared resources, and to predict their performance. The mathematical framework we use even allows the derivation of performance guarantees, making sure that application deadlines are never violated.

Organisation

Organization

Lecture:	On Tuesdays at 11:45h – 13:15h in 46/210 starting on April 16th, 2013 Note: Lecture location changed to 36/438 (DISCO seminar room) from April 30th on
Excercise:	NEW: For exam preparation purposes some exercise material has been provided further below on this page.
Contact:	Dipl.-Inf. Adam Bachorek

Course Overview

In this course students are supposed to obtain a detailed understanding of functions, structure and principles of mobile communication systems:

• Interworking between infrastructure and mobile end systems
• Diverse architectural alternatives
• Mobility support on different layers
• Mobile base technologies
• Internet technology-based mobility

Covered topics include:

• Phenomena of mobile and wireless communication
• Basics of cellular networks
• Mobile systems: GSM, UMTS, LTE, broadcast systems
• Selected mobile systems from the IEEE 802 family: 802.11x (infrastructure based modes), 802.16, 802.20
• Wireless Sensor Networks
• Mobile IPv4/v6
• Micromobility protocols: Cellular IP, Hierarchical MobileIP, Fast MobileIP
• Seamless session mobility for real-time applications
• TCP over mobile networks: performance evaluation and tuning
• Mobility support on the application layer

Literature

• Jochen Schiller. Mobilkommunikation. 2. überarbeitete Auflage, Addison-Wesley, 2003.
• Relevant standard documents (IETF RFCs, ITU-T specifications, IEEE standards, ...) will be referenced throughout the course.

Lecture Slides

Material

Lab Exercise Slides

Access to the slides listed below requires authentication. In case no Email containing the required details has been received yet, exercise participants can request them via Email to Adam Bachorek submitting full name and immatriculation number.

For those who remember, please use the same credentials as used during the exercise sessions for PC login :-)