Project Wireless Vietnam1 Final Presentation 21st of May 2003 Royal Institute of Technology, KTH Stockholm, Sweden

Project Wireless Vietnam2 Project Team Joanna Kühn Christine Simon Tung Thanh Nguyen Nhien To Ngo Hanh Van Nguyen KTH KTH MoST MoST MoST

Project Wireless Vietnam3 Project Team (cont) Principal: Coach: Co-coach: Lars Gimbert Alberto Escudero-Pascual Van Nguyen Hong DSV/Sida KTH/IT MoST

Project Wireless Vietnam4 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

Project Wireless Vietnam5 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

Project Wireless Vietnam6 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:

Project Wireless Vietnam7 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)

Project Wireless Vietnam8 Time plan January – 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)

Project Wireless Vietnam9 Wireless Technology Why IEEE b was chosen? Worldwide used technology Open standard Low cost Regulatory aspects (e.g. frequency, output power)

Project Wireless Vietnam10 Wireless Technology (cont) Two ways of building wireless networks: Ad-hoc  Peer-to-Peer Infrastructure  Point-to-Point  Point-to-Multipoint

Project Wireless Vietnam11 Peer-to-Peer No backbone, computers communication directly to each other Suitable for a smaller area (e.g. home networks)

Project Wireless Vietnam12 Point-to-Point Suitable for long distant dedicated links Wireless Outdoor Router (WOR) are used in bridging or router mode

Project Wireless Vietnam13 Point-to-Multipoint Suitable for long distant links with multiple clients sharing public networks Hidden node problem occurs

Project Wireless Vietnam14 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 b with polling function

Project Wireless Vietnam15 Wireless testbed

Project Wireless Vietnam16 Equipment COR-1100 OR-500 Antenna VP470/24 Antenna CA27/24 Antenna Cable Pigtails PC Card Gold S375 Cable IEEE b Radio equipment Low loss microwaves cables 2.4 GHz Antennas

Project Wireless Vietnam17 Team working in Hanoi Equipment configuration at the MoST office Working on the roof of the MoST building

Project Wireless Vietnam18 Setting up antennas 1st test trial with bamboo stick 2nd test trial with steel tower

Project Wireless Vietnam19 Testing the links Checking the “Line of sight”

Project Wireless Vietnam20 Test link results

Project Wireless Vietnam21 Future wireless network expansion

Project Wireless Vietnam22 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)

Project Wireless Vietnam23 Overview of Hanoi city

Project Wireless Vietnam24 Treats and weaknesses Human 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

Project Wireless Vietnam25 Internal problems Culture Different ways of thinking and working Objectives Different objectives for Swedish vs. Vietnamese team members

Project Wireless Vietnam26 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

Project Wireless Vietnam27 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

Project Wireless Vietnam28 Outcome Dr Mai Anh, the manager of STE-NET project in Vietnam is satisfied with the results of the implemented testbed.

Project Wireless Vietnam29 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

Project Wireless Vietnam30 Questions and Answers Feel free to ask questions! More info at: Webpage: