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Future Mobile Communications In The Networked Societies

August 8, 2002 Stanford University. Future Mobile Communications In The Networked Societies. Shingo Ohmori Communications Research Laboratory shingo@crl.go.jp. Contents. Some Statistics of Internet and Mobile Communications Future Trends of Mobile Communications

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Future Mobile Communications In The Networked Societies

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  1. August 8, 2002 Stanford University Future Mobile Communications In The Networked Societies Shingo Ohmori Communications Research Laboratory shingo@crl.go.jp

  2. Contents • Some Statistics of Internet and Mobile Communications • Future Trends of Mobile Communications • R&D for Future Mobile Communications • Support of Social Activities by Wireless in Networked Society • Conclusion

  3. Penetration Rates of Internet in the World As of March 2002 Cited from NUA (http://www.nua.ie/)

  4. Internet Users in the World

  5. Required Years for Attaining the 10% Penetration Rates ofthe Major Telecommunication Media in Japan Investigated by “Survey of the Communication Usage Trend ” of MPT

  6. Penetration Rates of Mobile Phones in the world as of June 2000

  7. Numbers of Subscribers of Wired and Wireless phones in Japan

  8. Internet Mobile Phones- (internet phones/Mobile phones)- (as of 2001.12)

  9. Penetration of Broadband Access

  10. Data Rates of Typical Media

  11. Cyber Attack System Handover SkyNet Cyber Theater Online-Government Broadband Backbone Networks Social Activities In Networked Society -Bridging the Digital Divide- Satellite Networked Society Cellular Welfare HAPS Wireless Access Base station Switch ITS System Handover System Handover System Handover New Generation Mobile Tele-medicine Online Commerce

  12. Requirements for Networked Society Requirement Technologies Multimedia Information Broadband Networks Mobile Communications Anywhere, anytime Security Data Encryption Barrier Free Human Interface

  13. Three Categories of Future Mobile Communications • New Generation Mobile Communications • Broadband access (High data rate) • High mobility • Several systems coexist • Seamless connections to different systems • Ad-hoc Wireless • Bluetooth • Ultra Wide Band • Information Barrier Free • Wireless support for senior and handicapped people • Easy access to the Information for social activities

  14. Generations of mobile communications and their keywords and typical systems

  15. ITM-2000The 3rd generation mobile communication systems

  16. FOMA by DoCoMo-IMT-2000 with W-CDMA- • Start: 2001.10 • Coverage : about 70% of population (2002.3) • Main services • High speed data:384 kbps • TV-phone : 64 kbps • Movies, News • i-mode

  17. New Generation of Mobile Communication Systems - ITU-R WP8F : Illustration of Capabilities of IMT2000 and Systems Beyond - Dark blue color indicates existing capabilities, medium blue color indicates enhancements to IMT-2000, and the lighter blue color indicates new capabilities of Systems Beyond IMT-2000

  18. Satellite Cellular System Handover HAPS SkyNet Base Station HDR Access Switch ITS System Handover System Handover System Handover Broadband Fixed BackboneNetworks New Generation of Mobile Communications -New concept of system roaming among different systems-

  19. Why does high speed data transmission difficult in mobile environments? • Broadband transmission is difficult • The higher the data rate, the wider the frequency band • Fading effect becomes large. • It needs more electric power. Information Information Transmission rate Frequency bandwidth Large Small

  20. Why does high speed data transmission difficult in mobile environments? • Signal strength varies according to time and space. Reflection and scattering Fading Antenna gain Antenna gain Large antenna→Big gain Signal strength becomes weak depending on propagation distance. Received power Transmitted power

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