Capita selecta programmatuur: Broadband communication

“Broadband Communication” Francqui KULeuven 2005-2006 by Piet Demeester

General information on examination

Material for the examination

All the lectures

• Inaugural lecture
• Internet support for multimedia flows
• Access Networks
• Optical Networks
• Mobile Networks
• Grid Computing
• Reliability of Communication Networks

Publications

• Internet support for multimedia flows:
  • The Session Initiation Protocol: Internet-Centric Signaling (Schulzrinne, Rosenberg)
  • On the building blocks of quality of service in heterogeneous IP networks(Soldatos, Vayias, Karmentzas)
• Access Networks:
  • Media Access Control for Ethernet Passive Optical Networks: An Overview(Zheng, Mauftah)
• Mobile Networks:
  • IP Micro-Mobility Protocols (Reinbold, Bonaventure)
• Grid Computing:
  • A Gentle Introduction to Grid Computing and Technologies (Buya, Venugopal)
• Reliability of Communication Networks
  • Benefits of GMPLS for Multilayer Recovery (Puype et.al.)

Examination

• Closed book exam: 70% from list of questions (see below), 30% not from list
• Open book (slides, notes, publications allowed): e.g. questions that link different subjects together or small exercises
• Evaluation: roughly 70% closed book, 30% open book
• Duration: 3 hours

Illustrate your answers with clear figures (when appropriate)

List of Questions

• The whole question or a part of a question may be asked
• Some questions are related to the publications that are listed above (they are indicated in italic)

Internet support for multimedia flows

Explain the principle of and relation between a user plane and a control plane in classical telephony.

slides 5-10

Describe 3 cases where VoIP is used.

slides 15-17

What is SDP.

slides 19-22

Explain the general principle of SIP and give the basic building blocks.

slides 24-27

An example of a SIP message is given during the exam: explain.

slides 33-39

Give 2 specific problems when the Internet is used for voice. What are (partial) solutions to these problems.

Problems 42

• packet loss 43
• jitter 44-45
• link delay 46

Terminal actions 49

• CODEC 50-60
• Timing: RTP 61-63
• de-jitter buffer 64
• packet concealment 65

Network actions 66-68

• QoS Router 69-82
• Network coordination 84-96

How does RTP resolve timing problems encountered when transporting voice or video over internet.

slides 61-63

Explain the principle of a QoS aware IP router.

slides 69-82

Explain classification, shaping, policing, queueing, scheduling, buffer management as used in a QoS aware IP router.

slides 69-82

Explain the principle of 2 techniques used to support flow differentiation in IP networks.

slides 84-88

• IntServ (Integrated Services)
• DiffServ (Differntiated Services)

Explain the operation of MPLS.

slides 92-96

Explain the principle of VOQ (Virtual Output Queue) and why is it used.

Paper: On the building blocks of quality service in heterogeneous IP networks p. 78

Access Networks

Explain the evolution of a classical telephone access network towards a triple play enabled access network.

Triple play: telephone, tv, internet 19

Explain the ADSL architecture (figure from ITU-T rec G.992.1 will be given).

slides 30-35

Explain the principle of DMT and QAM.

• Discrete Multi Tone 39-42
• Quadrature Amplitude Modulation 43-46

Explain the basic principles of : CRC, scrambling, FEC.

• Cyclic Redundancy Check 59-62
• Scrambling 63-64
• Forward error correction 65-69

Explain in detail FEC (coding and decoding).

• Forward error correction 65-69

Explain the evolution of a classical coax access network (CATV) towards a triple play enabled access network.

slides 80-83

Explain the basic principle of MPCP in E-PON. Give 3 polling policies.

• Ethernet-Passive Optical Network 96-105
• Multi Point Control Protocol 106-108
• Polling policy: Interleaved Polling with Adaptive Cyclic Time 110-111

Paper: Media Access Control for Ethernet Passive Optical Networks: An Overview

• E-PON p. 145-146
• MPCP p. 147
• Polling policies p. 148
  • Poll-and-stop polling
  • Interleaved polling
  • Interleaved polling with stop

Explain DBA in E-PON.

Dynamic Bandwidth Allocation 109

Paper: Media Access Control for Ethernet Passive Optical Networks: An Overview

• DBA p. 149

Optical Networks

Optical Packet Switching is not part of the examination subject matter

Explain the difference between logical and physical topology. Give an example.

slides 5

Explain the principle of WDM and OTDM.

slides 9-17

• Wavelength Division Multiplexing
• Optical Time Division Multiplexing

Explain the principle of dispersion, attenuation, 3R regeneration, space switching, wavelength switching, optical memory.

slides 19-25

Give the basic structure of an OXC and OADM.

slides 27-31

• Optical Cross Connect
• Optical Add-Drop Multiplexer (http://en.wikipedia.org/wiki/Add-drop_multiplexer)

Explain the difference between an optical network with or without wavelength conversion.

slides 32-33

Explain the principles of control planes in optical networks: static versus dynamic, dynamic overlay versus dynamic peer.

slides 35-39

Mobile Networks

Explain: FDMA, TDMA, SDMA and CDMA.

slides 6-14

• Frequency Devision Multiple Access
• Time Devision Multiple Access
• Space Devision Multiple Access
• Code Devision Multiple Access

Explain: TDD, FDD.

slides 15

• Time Division Duplex
• Frequency Division Duplex

Explain: hidden terminal problem, exposed terminal problem.

slides 16-22

Explain RTS/CTS principle.

slides 20-21

• Request To Send
• Clear To Send

Explain FHSS and DSSS.

slides 23-25

• Frequency Hopping Spread Spectrum
• Direct Sequence Spread Spectrum

Describe the basic architecture of a GSM network.

slides 28-31

Explain roaming in GSM.

slides 30

Explain the evolution towards 3G (briefly explain the different technologies/enhancements).

slides 42-47

Explain the principle of DFWMAC-DCF using CSMA/CA using an example.

slides 57-59

• Distributed Foundation Wireless Medium Access Controll-Distributed Coordination Function
• Carrier Sense Multiple Access with Collision Avoidance

Explain the principle of Mobile IP.

slides 75-78

Make a comparison between GSM and Mobile IP.

slides 79

Explain the principle of Hierarchical Mobile IP and Fast Handoff.

Paper IP Micro-Mobility Protocols p. 49-50

Grid Computing

Explain the evolution towards grid computing from 2 different perspectives.

• Historical 3-16
• Network: 42

Give 4 types of grids and explain the principles.

slides 46 (use a mirror)-56

• Cycle scavenging grids
• Computational grids
• Data grids
• Service grids

Describe the building blocks of a grid architecture.

slides 59-64

Reliability of Communication Networks

Explain Static versus Dynamic multilayer recovery.

--Jeroentrappers 8 mei 2006 09:56 (CEST)