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A Scenario of Mobile Communications in hazardous situations and physical disasters

A Scenario of Mobile Communications in hazardous situations and physical disasters. by Mr. Alexander Soulahakis Supervisor Prof. Madjid Merabti. Overview. Objectives Scenario Theory GSM Design Decisions 802.11 Wireless Lan SMS without network support Experiment – Phases

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A Scenario of Mobile Communications in hazardous situations and physical disasters

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  1. A Scenario of Mobile Communications in hazardous situations and physical disasters by Mr. Alexander Soulahakis Supervisor Prof. Madjid Merabti

  2. Overview Objectives • Scenario • Theory GSM • Design Decisions • 802.11 Wireless Lan • SMS without network support • Experiment – Phases • Conclusions Literature Review • Papers • Standards • Books • Books Wireless Lan • Books GSM • Mobile Radio Networks • Caution Project • Tools / Simulator Manuals

  3. Objective of the project • The scope of the project is an alternative way of GSM communications, by proposing Ad hoc networking and 802.11 as a suitable communication mean. • Transmit SMS over 802.11 • Receive SMS on GSM device through 802.11

  4. Scenario • September 11th 2002 New York WTC attack • September 7th 1999 Athens Earthquake In both situations mobile communications were not available as the networks were overloaded by 400-500%

  5. Scenario

  6. Scenario

  7. Scenario

  8. Scenario

  9. Scenario

  10. Scenario BOOM !!!

  11. Scenario Companies assume that only a fraction of their Subscribers will call simultaneously • GSM • Blocks outgoing calls • Interrupts incoming calls • VERIZON – Mobile Cells - Router • Normal operation • Peak times • Occasionally • Overload • Congestion • CASES • Wired Network Destroyed • Wireless Network Destroyed • Partial Failure • Complete Failure Sectorization Statistics- Modelling – Increase Bandwidth Caution AI Techniques for avoiding congestion

  12. Theory GSM • Authentication • Localization • Call Handling • SMS Management • Connects to PSTN • Basic Model Mobile Host CELL PSTN

  13. DESIGN DESICIONS • Transceiver • GSM probes only CELL site • Mobile phone cannot communicate direct with other mobile phones • Changing software of the mobile device : GSM

  14. DESIGN DESICIONS BLUETOOTH • Up too 8 users • Connection through piconents will be slow • Range is 100 -200 meters • Rooting ? Class 3    -    1 mW         (0dBm)         with a 'typical range' of 10mClass 2    -    2.5 mW      (4dBm)         with a 'typical range' of 20mClass 1    -    100 mW    (20dBm)        with a 'typical range' of 100m Link data rate -  a maximum link baseband data rate of 723.2 kb/

  15. 802.11 Wireless Lan

  16. 802.11 Wireless Lan • Ad Hoc Capabilities • Support Infrastructure • Privacy • Transparency Stations can communicate among each other (Ad hoc Mode) or with stations beyond their direct communication range with the support of an infrastructure (Infrastructure Mode). (802.11b) may communicate with each other without a wireless access point –'Ad Hoc' mode ‘Infrastructure' mode, a communication method that requires a wireless access point.

  17. 802.11 Wireless Lan Two of the advantages of the standard are the following: It provides privacy of user information The services are compatible with ad hoc and infrastructure service. For current scenario the transfer rate will be used is 1Mbit/second though 802.11 specification allows up to 54Mbits/second. Its frequency bands are 902-928 MHz, 2400-2483.5 MHz and 5725-5850 MHz. A great issue is that a mobile station is able to communicate with any other mobile or wired station transparently, which means that above the MAC layer 802,11 appears like any other 802.x LAN and offers comparable services.

  18. 802.11 Wireless Lan • Range • Speed – Bandwidth • Power consumption

  19. Power Consumption • Atheros AR5004 chipsets also improve power consumption by 60% over 802.11b chipsets. The chipsets enable a multi-phase approach to signal processing that dramatically extends the battery life of mobile devices. The new design controls the power of different sections of the wireless device according to the level of system and network activity. http://www.atheros.com/pt/index.html

  20. SMS without network support

  21. Experiment - Phases Phase 2 Bridge GSM Device with 802.11 Phase 1 Implementation on 802.11

  22. Current Status • Decision • Libraries • Software • Simulation • Equipment Experimental Phase Phase 1 • Implementation on 802.11 Phase 2 • Bridge GSM Device with 802.11 Phase 3 • Testing

  23. Conclusions • Bridge GSM -802.11 • Send SMS without network support through 802.11 (ad hoc mode) • Send FREE SMS through 802.11 to other users

  24. The End

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