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

What is grid middleware.

slides 65-66

Explain grid scheduling.

slides 70-71

What is application gridification. Give two examples.

slides 75

What is network aware grid scheduling. When is it important.

slides 94

Reliability of Communication Networks

Explain Static versus Dynamic multilayer recovery.

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