Communication Networks 1 / Kommunikationsnetze 1

Main Lecturer:

Lecturer: Prof. Dr.-Ing. Frank Fitzek

Teaching Assistants:

Assistant: Dipl.-Ing. Stefan Senk
Assistant: Dipl.-Ing. Paul Schwenteck
Assistant: Dipl.-Ing. Pit Hofmann
Assistant: Dipl.-Ing. Jonas Schulz



In this lecture the students will learn about the basic principles for communication systems. An important role has the layered communication protocol stack that allows for a global network with large flexibility. The different layers will be introduced and prominent protocols are discussed more in detail. Together with simple programming examples the students should understand the basic approach of communication networks. The lecture will also link the teaching content with ongoing research activities at the chair.

Course Basics

  • The course as well as the exam will only be offered during the summer semester.
  • Language: German (material will be provided in English)
  • Course Number:
  • Compulsory course (ET/IT: 6th semester)
  • 2 2 0 (lecture/seminar/practical course)
  • Written exam: 150min

Important Links


We request all students to enrol on the OPAL course and to join the TUD Matrix Chatroom. See links above.


Time Schedule Summer Semester 2023

DateTypeLocationTopicYoutube Videos
2023-04-04L1-1BAR/SCHÖ/EOrganization, Introduction of ComNets ChairL0-01 to L0-02
2023-04-06L1-2BAR/0I88/UHistory and Introduction of Communication Systems/MotivationL1-01 to L1-03
2023-04-11L2BAR/SCHÖ/EConcept of a layered model, 7 ISO/OSI model, StandardizationL2-01 to L2-06
2023-04-13E0+E1BAR/0I88/UE0: Introduction, E1: ISO-OSI Layer Model: Example tasks and protocols per layer-
2023-04-18L3BAR/SCHÖ/E[L1:PHY-1] Symbol and Bits, Different mediums, Error correction and detection on bitsL3-01 to L3-06
2023-04-20L4BAR/0I88/U[L2:DL-1] Channel Access, CSMA, CDMAL4-01 to L4-03
2023-04-25L5BAR/SCHÖ/E[L2:DL-2] FEC and ARQ, IEEE802.3 Ethernet, Hub CommunicationL4-04 to L4-06
2023-04-27E2BAR/0I88/U[L1:PHY-1] Error detection with CRC and Hamming code; Molecular Communication Testbed-
2023-05-02L6BAR/SCHÖ/E[L2:DL-3] IEEE802.11 WiFi, Throughput/LatencyL4-07 to L4-08
2023-05-04E3BAR/0I88/U[L2:DL-1] Throughput calculation; Introducing Raspberry PI Pico-W-
2023-05-09E4BAR/SCHÖ/E[L2:DL-2] Sliding Window; ARQ; Collision Detection-
2023-05-11E5BAR/0I88/U[L2:DL-3] Cellular vs WiFi; ARQ with Losses; Interframe Spacing and Throughput with WiFi-
2023-05-16E5 - HandsonBAR/SCHÖ/E[L2:DL-3] Hands-On: WiFi Security with Commercial Access Point-
2023-05-18Ascension Day---
2023-05-23L7BAR/SCHÖ/E[L3:N-1] Graph Theory: Max Flow Min Cut, Dijkstra, Mean Hop in Mesh Networks, Network Coding 101L5-01 to L5-05
2023-05-25E6BAR/0I88/U[L3:N-1] Topologies, Min-Cut/Ford-Fulkerson; Dijkstra, Multi-Hop/Mean Number of Hops-
2023-06-06L8BAR/SCHÖ/E[L3:N-2] Switching, IP Networking, Queuing TheoryL5-06 to L5-09
2023-06-08E7BAR/0I88/U[L3:N-2] Switching Technology; IP address calculation (IPv4, IPv6); Networking Tools 101-
2023-06-13L9BAR/SCHÖ/E[L4:T-1] UDP, TCP, Header, Variants, QUIC, Coded TCPL6-01 to L6-07
2023-06-15E8BAR/0I88/U[L4:T-1] TCP vs. UDP, Congestion Control-
2023-06-20L10BAR/SCHÖ/E[L5-7:S,P,A-1] Higher Layer Protocols, RTP, SIP, Source Coding, Video CodecsL7-01
2023-06-22L11BAR/0I88/UCross Layer and Header Compression; Overall aspects of ISO OSI reference model; Cellular SystemsL8-01, L9-01, L10-01
2023-06-27E9BAR/SCHÖ/E[L5:N-1] Hands-on Session: We program a simple chat over TCP with the Raspberry Pi Pico-W!-
2023-06-29E10BAR/0I88/U[L5-7:S,P,A-1] Higher Layers: HTTP, TLS, Source Coding; Coding Examples with Python
2023-07-04E11BAR/SCHÖ/E[L5-7:S,P,A-1] BGP, Autonomous Systems; How does the internet work?-
2023-07-11E12BAR/SCHÖ/EBasics of 5G-
2023-07-13E13BAR/0I88/UHands-on Raspberry Pi Pico-W: Putting Things together with our Sensor Example!-
2023-07-28: 14:00Exam consultationBAR/S4Your topics!-
2023-08-01 11:10ExamBAR/SCHÖ/ELecture, Exercise SS2023, Exam Announcement 2023-
2023-08-01+2wExam Reviewt.b.d.--


  • L – Lecture
  • E – Exercise
  • t.b.d. – to be determined