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Project Wireless VietnamFinal Presentation 21st of May 2003

Royal Institute of Technology, KTH Stockholm, Sweden

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Project Team

Joanna Kühn Christine Simon Tung Thanh Nguyen Nhien To Ngo Hanh Van Nguyen

KTH KTH MoST MoST MoST

joannak@kth.se iw02_sch@it.kth.se tungnt@moste.gov.vn ntnhien@moste.gov.vn hanh@moste.gov.vn

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Project Team (cont)

Principal: Coach: Co-coach:

Lars Gimbert Alberto Escudero-Pascual Van Nguyen Hong

glimmen@dsv.su.se aep@it.kth.se hvan@moste.gov.vn

DSV/Sida KTH/IT MoST

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Overview Introduction

Background Project goal Time Plan

Wireless Technology Network design & implementation Test link results Future expansion

Risk analysis Treats & weaknesses Problems Benefits

Summary & Conclusions Questions & Answers

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Background The Wireless Vietnam project is a subproject of

the ongoing Science, Technology and Education network (STE-NET) project

The STE-NET project aims to build an educational network infrastructure

The infrastructure will provide Internet connectivity and information services to the different educational sectors in Vietnam

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Background (cont)

Sida – Swedish International Development co-operation Agency

MoST – Ministry of Science and Technology in Vietnam

IT – University in Kista, Sweden

                         

             

 

The STE-NET project is co-operation between:

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Project goal Provide a showcase and evaluate the

wireless broadband technology by deploying a testbed, which connects MoST with two other buildings.

The two chosen buildings acting as pilot sites:

NACENTECH (National Centre for Scientific and Technological Information and Documentation)

NACESTID (National Centre for Technology Progress)

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Time planJanuary – March: Stockholm

Initialization of the project Research in wireless technologies Selection of an appropriate wireless technology Design the wireless network

April – Middle of May: Hanoi Testing equipment Implementation of the testbed Evaluation of the design network Documentation

May: Stockholm Course deliverables (final presentation, video, final report,

exhibition material, lesson learned paper)

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Wireless TechnologyWhy IEEE 802.11b was chosen?

Worldwide used technology Open standard Low cost Regulatory aspects (e.g. frequency, output

power)

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Wireless Technology (cont)

Two ways of building wireless networks:

Ad-hoc Peer-to-Peer

Infrastructure Point-to-Point Point-to-Multipoint

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Peer-to-Peer

No backbone, computers communication directly to each other

Suitable for a smaller area (e.g. home networks)

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Point-to-Point

Suitable for long distant dedicated links

Wireless Outdoor Router (WOR) are used in bridging or router mode

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Point-to-Multipoint

Suitable for long distant links with multiple clients sharing public networks

Hidden node problem occurs

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Hidden node problem

Occurs when the nodes do not “hear” each other due to obstacles (e.g. trees, buildings) between them

Avoided by extending the standard IEEE 802.11b with polling function

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Wireless testbed

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Equipment

COR-1100

OR-500

Antenna VP470/24

AntennaCA27/24

Antenna Cable

Pigtails

PC Card Gold S375 Cable

IEEE 802.11b Radio equipment Low loss microwaves cables 2.4 GHz Antennas

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Team working in Hanoi

Equipment configuration at the MoST office

Working on the roof of the MoST building

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Setting up antennas

1st test trial with bamboo stick 2nd test trial with steel tower

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Testing the links

Checking the “Line of sight”

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Test link results

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Future wireless network expansion

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Future network recommendation

Is the implemented wireless network the best solution for future use?

No, because: Lack of “line of sight” due to too low radio

towers for covering the whole area of Hanoi

Yes, if: Making the existing radio tower much higher Using the highest building in Hanoi (e.g. Hanoi

Tower)

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Overview of Hanoi city

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Treats and weaknessesHuman Resources

Cultural conflicts Other parallel work

Logistics Faulty equipment in Hanoi Permission to access the buildings Permission to use wireless equipment

Risks during implementation Problems predicting the situation in Hanoi Radio link problems

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Internal problems

Culture Different ways of thinking and working

Objectives Different objectives for Swedish vs.

Vietnamese team members

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External problems

Hierarchical level at MoST Bureaucracy Decisions are made beyond our influence and

knowledge, and takes long time Not possible to obtain a frequency license within the

time frame of the project No permanent link implementation wanted within the

time frame of the project

Budget approved too late Lack of time for testing equipment in Sweden

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Benefits

Learn about wireless technologies and project management

Theoretical and practical, hand-on experiences

International project beyond countries’ boarders gives a deeper understanding of other cultures and way of working

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Outcome

Dr Mai Anh, the manager of STE-NET project in Vietnam is satisfied with the results of the implemented testbed.

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Summary & Conclusions Learnt about wireless technologies Implemented the wireless testbed at two pilot sites:

NACESTID and NACENTECH No permanent solution wanted today Recommendation for future expansion Vietnamese team members working at MoST, have

the right knowledge for future implementations of wireless networks

Dr Mai Anh satisfied with our work and the results Gaining international experience and discover new

cultures

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Questions and Answers

Feel free to ask questions!

More info at:

Webpage: http://csd.ssvl.kth.se/~csd2003-team3Email: csd2003-team3@csd.ssvl.kth.se