34330 lecture 14 2010
TRANSCRIPT
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Introduction to Network Modelling and Simulation
Course 34330 Introduction to Mobile Communication
Lecture 14
October 15, 2010
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14 October 20102 DTU Fotonik, Technical University of Denmark
Learning objectives and today’s agenda
• After this lecture, you should be able to:
– Discuss the application of computer simulations in relation to communication networks
• Agenda:
– Computer simulation of communication networks – how and why
– Introduction to the simulation exercise
– Introduction to the individual project
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Network modelling and simulation
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14 October 20104 DTU Fotonik, Technical University of Denmark
What is modeling and simulation?
• The imitation (and not a replication!) of a real-life system or subsystem
– Artificially generates the history of a system
• Based on assumptions a model canbe developed, validated and verified
– Model development is an art!
• Questions about the real-life systemscan now be answered by performingexperiments with the model. This is called simulation.
Valid
ation
System
Conceptual
model
Model
implementation
Verification
Valid
atio
n
implementation
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14 October 20105 DTU Fotonik, Technical University of Denmark
Benefits of simulation
• Predict the behavior of systems
– That do not yet exist
– That are not available for testing
– That are complex
– That are very large
• Event driven simulation
– Ideal for protocol and behavioral modeling
– Shows protocol interactions and application behavior
• Alternatives
– Analytical model
– Measurements
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14 October 20106 DTU Fotonik, Technical University of Denmark
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Why simulate data services in mobile networks?
• Mobile data services must be considered separately from voice services!
– Increased load degrading level of service
– A suite of very differing services
– Satisfactory service level depends on the service
– Bursty services average load not interesting
– Interactive services sensitive to delays
• Network dimensioning impacts service behavior
– Over provisioning is costly
– Under provisioning is costly
• Simulation makes you test drive data services
– Predict behavior
– Dimension correctly - and add capacity at the right time
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14 October 20107 DTU Fotonik, Technical University of Denmark
Simulation – operator benefits
• What mobile operators want:
– Improve their business
– Rapid solutions to their current operational issues
– Inputs to their strategic planning (e.g., when to migrate to new technologies)
• How can mobile operators improve business?
– Get more subscribers
– Increase the usage of network data services
– Improve QoSEE (end-to-end Quality of Service)
– Reduce costs
– Deploy capacity at the right time
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The CommWyse simulation tool
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14 October 20109 DTU Fotonik, Technical University of Denmark
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CommWyse Simulator: IMNS 3000
• Mobile network simulator
• Detailed models of network elements
– Discrete event protocol models (just like the real protocols)
– End-to-end data flows
• Predicts application and network behaviour for a number of different categories of users
Topology
Configuration
Traffic
Mobile network in a box
Network view
User view
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14 October 201010 DTU Fotonik, Technical University of Denmark
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CommWyse simulation tool
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Introduction to the lab!
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14 October 201012 DTU Fotonik, Technical University of Denmark
Lab topics
• GPRS / EDGE
– Comparing GPRS and EDGE performance
– QoS from a users‟ point of view
• UMTS
– dynamic rate adaptation
• HSDPA
– Basic performance compared to UMTS
– Iub dimensioning
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14 October 201013 DTU Fotonik, Technical University of Denmark
Practical details
• You already got an account to DTU Fotonik‟s databar in building 343 room 105
• 44 participants but only limited number of software licenses Not possible to have the exercise for all students on the same day
– The regular timeslot on 4 Tuesdays have been reserved, i.e., no lectures in these timeslots
– Please show up for the exercise on the assigned day – there might not be an available computer for you on another Tuesday!
• Lab manual will be available from CampusNet no later than October 22
– Please bring it with you to the exercise
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14 October 201014 DTU Fotonik, Technical University of Denmark
Practical details (2)
• Documentation of exercise in report
– Deadline: November 26 at 12:00
• Choose „Assignments‟ in CampusNet
• Suggested report structure:
– Introduction, e.g., what is simulation and why is it a good idea to use for mobile communication systems.
– GPRS / EDGE simulation setup, results and discussion
– UMTS simulation setup, results and discussion
– HSDPA simulation setup, results and discussion
– Conclusion
• Remember: Simulation report counts for 10% of final grade
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Individual project
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14 October 201016 DTU Fotonik, Technical University of Denmark
Individual project
• As part of the evaluation requirements, you must do an individual project, which counts for 20% of your final grade
• Project: Theoretical analysis of some technology/system/… related to the topics and scope of this course.
• Possible things to include:
– General description/overview of the chosen technology/system/…
– Comparisons with topics from the textbook/lectures (GSM, GPRS, …)
• Pros and cons
– Typical applications and/or usage scenarios
– …
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14 October 201017 DTU Fotonik, Technical University of Denmark
Individual project (2)
• See a list of possible project topics at:
http://files.fotonik.dtu.dk/larst/34330_Individual_Project.html
• Own idea for topic: OK (if relevant), but it has to be approved
– Send mail to [email protected] with proposal
• Limited number of students per topic
• Individual project – but it‟s OK to discuss your topic with fellow students
• Document with practical details on CampusNet
• Need help? Just ask us
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14 October 201018 DTU Fotonik, Technical University of Denmark
Individual project (3)
• Typical workflow:
– Selection of a topic
– Gathering relevant material (papers, standards, white-papers, etc.)
– Getting familiar with the material
– Narrowing the scope and making an outline
– Writing the report
• Size of report: Ideally 8 – 12 normalpages
– 1 normalpage ≈ 2400 characters (letters, digits, spaces, …)
• Hand-in of report through CampusNet
– Deadline is December 3 at 15:00 – Absolutely no extension to the deadline will be granted, since we have to read your report before the oral exam
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14 October 201019 DTU Fotonik, Technical University of Denmark
Concerning plagiarism
• DTU does not tolerate plagiarism!
– Plagiarism: ”… is the unauthorized use or close imitation of the language and thoughts of another author and the representation of them as one's own original work.” Source: Wikipedia
• ”Patchwork” writing (Changing “… system that is …” to “… system, which is …”) is also considered as plagiarism!
• (Suspicion of) plagiarism will be reported. Possible consequences of plagiarism:
– Written warning
– Nullifying the points of this course or even entire semester(s)
– Expulsion
• When you hand-in your report through CampusNet, it will automaticallybe checked by Urkund!
There are absolutely no acceptable excuses for plagiarism, regardless of your prior experience, background, etc.
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References
• Source material must be properly referenced:
– Main text: ”… the thingamajig converter [16] is used to increase …”
– References section: [16] J. Doe, ”A thingamajig converter for mobile phones”, Journal of Fascinating Technical Gadgets and Gizmos, Vol. 32, no. 4, 2005
– See the project information document for more examples on how to reference source material
• Quotations: OK to include a limited number
– Usually no more than 2-3 sentences per quotation
– Must be properly indicated (e.g. italics and quotation signs) and referenced
– Only include quotations when it‟s (very) relevant
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Summary
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Summary and next time(s)
• Computer simulation and modelling of mobile communication networks
• Simulation exercise
– Deadline for the report: Nov. 26 at 12:00
• Individual project
– Deadline for the report: Dec. 3 at 15:00
Please notethat the
deadlinesare different!