Jérôme HÄRRI

My courses

• EmSim / Fall 2013 - Emulation and simulation methodologies

  Communication solutions for ITS must be evaluated for performance and benefits on ITS. Although field trials or operational tests are the most important final test before commercial deployment, cost, logistic and safety concerns make  simulation and emulation studies the preferred choice for flexible tests of communication solutions for ITS. Yet, simulation and emulation platforms, if employed using incorrect methodologies, may lead to inaccurate results.

  This module teaches the fundamentals of simulation and emulation methodologies providing guidance on how to design a performance evaluation campaign, set up a test scenario, select the appropriate models, level of granularity, metrics for statistical correctness, and discuss the differences between simulation and emulation platforms and how to use them for accurate performance evaluation of communications for ITS.

   Details of each section:

  • Fundamentals of Discrete Event Simulations (DES) - we describe here basics of DES and how complex simulators are built on them.
  • Model-based  Representation  -  we cover in this section the various models that need to be  included in a DES, from communication and networking, to mobility and data traffic, and describe the methodology to model them correctly.
  • Application-based Granularity Requirements - We describe here the different granularity level of the model-based evaluation, from bit-level, packet-level, to system-level evaluation, and their appropriate selection as a function of the application requirements.
  • Fundamentals on Random Numbers - Random numbers play a crucial role in DES-based evaluations. We describe various approaches, and pitfalls to avoid.
  • Fundamentals on Statistical Tools for Performance Evaluation - Performance evaluations require a correct methodology for statistical correctness of the results. We provide in this section the basics of statistics that can be used in simulation and emulation studies .
  • Simulation  vs. Emulations and- We cover the fundamental differences between simulation and emulation platforms, and describe their assets and drawbacks. 
  • Case study  -We introduce two widely known simulation platforms and one emulation platform that can be used for the evaluation of communications for ITS, and describe their features and take them as case-study for exemplary ITS scenarios.
    • The Network Simulator 3 (http://www.nsnam.org/)
    • The iTETRIS ITS platform (http://www.ict-itetris.eu/10-10-10-community/)
    • The OpenAirInterface (http://www.eurecom.fr/openairinterface/)

• MobWat / Spring 2013 - Wireless Access Technologies
  • This module teaches the state-of-the art techniques for wireless access.
  • This module will address wireless access issues in the context of vehicular communication for Intelligent Transportation Systems (ITS).
  • The interested students will learn the challenges of accessing a wireless network, how to address the impact of mobility, how to differentiate various types of message and deal with the QoS, understand the impact of distance, transmission policies or the environment on the communication quality, and finally how wireless access technologies could improve the future ITS.
  • This module puts experimentations to the center and will schedule 3 lab sessions for 4 lectures.

• Stand / Fall 2013 - Standardization activities
  • Over the past years, wireless communication for ITS went over important standardization efforts. It remains yet very hard to gather a global vision of the different aspects and roles, as standardization is conducted as a function of various countries and on different protocol stacks (IETF for IPv6, IUT for the frequencies, IEEE for the 802.11p and WAVE, ETSI/ISO for the higher protocol stacks). The knowledge of available protocols and standards as well as their inter-relations in ITS is important to design innovative ITS applications and to to develop the required communication system.
  • The objective of this course is to provide a global and coherent view of ITS standardization activities in major standardization institutions or industry consortia, such as the IEEE, the ETSI, the ISO, the IETF and the SAE. The course will also illustrate the similarities and differences between different approaches in Europe, the US, and the rest of the world.