System Aspects in Communications

Module Number: EI7432

Duration: 1 Semester

Occurence: Winter Semester

Language: English

Number of ECTS: 5


Professor in charge: Gerhard Kramer

Amount of work

Contact hours: 60

Self-study hours: 90

Total: 150

Description of achievement and assessment methods

Examination with the following elements:- Written examination

Exam type: written

Exam duration (min.): 90 Minutes

Possibility of retaking: In the next semester: Yes; at the end of the semester: No

Homework: No

Lecture: No

Conversation: No

Written paper: No

Recommended requirements

  • Signal description in time- and frequency-domain
  • Basic knowledge in mobile communications (e.g. Rayleigh Fading), system theory and in statistics

The following modules should be passed before teking the course:

  • It is recommended to visit "Mobile Communications" before


Cellular systems: Cell Layout, ANtenna Pattern, Pathloss, Shoadowing, Link Budgets, Mobility/Handover/Cell Selection

Radio Access Systems: WCDMA, distributed/localized OFDM/OFDMA, Single Carrier FDMA

Duplex methods: TDD/FDD

Interference: Intracell Interference, Self-Interference, Intercell Interference, MEthods for Interference Mitigation

PHY mechanisms: Power Control/Loading, Adaptive Modulation and Coding

MAC Scheduling: Channel Dependent, QoS Impact, Frequency Dependence, Impact on Physical Layer

MAC/RLC/PDCP: IP convergence, Robust HEader Compression, Segmentation, HARQ

MIMO: Diversity Techniques, achievable gains, Single/Double Sream, Open/Closed Loop Techniques

X-Layer: OSI Model, Shared Channels, Packet Sitched/Circuit Switched

System Architecture: Modile Stations, Base Stations, Central Nodes, Gateways, Interfaces

Existing Systems: UMTS/HSDPA/HSUPA/HSPA Evolution, Long Term Evolution, WiMAX

Coexistence: Problems with neighboring bands

Services/Applications/Higher LAyer (Guest Thomas Stockhammer): Codecs, Broadcast Services, Bearers, QoS Transfer

Study goals

At the end of the module students are able to put all details wich they have learned in previous courses (Signal Processing, Channel Coding, Mobile Communications, etc.) into the context of a mobile and cellular communication system such as LTE. Practical constraints and interactions of many different mechanisms (Cross-layer view) will be understood.

Teaching and learning methods

  • Learning method: The topics of the lecture will be further illustrated in the tutorial. It is recommended to resapitulate the slides with short temporal distance to the lecture. Students are motivated to ask questions during the lecture.
  • Teaching method: During the lectures students are instructed in a teacher-centered Style. The exercises are held in a student-centered way

Media formats

The following kinds of media are used:

  • Presentations (the resented slides are available as download)
  • Exercises with solutions as download


The following literature is recommended:

  • Harri Holma, Antti Toskala (Editors); LTE for UMTS - OFDMA and SC-FDMA Based Radio Access, Wiley, June, 2009
  • Erik Dahlman, 3g Evolution: HSPA and LTE for Mobile Broadband, Academic Press, 2007