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Wireless Telecommunication ISEP 2006/2007 Tender Project Coverage and Traffic

Group C Alexis CHALMOT DE LA MESLIERE Prem MARIANNIE. Viken TORAMANIAN Vojtech KOTOUS Yohan GUILLET. Wireless Telecommunication ISEP 2006/2007 Tender Project Coverage and Traffic. Outlines. Introduction Choice of Technology Mobility Requirements Coverage and Planning Traffic

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Wireless Telecommunication ISEP 2006/2007 Tender Project Coverage and Traffic

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  1. Group C Alexis CHALMOT DE LA MESLIERE Prem MARIANNIE Viken TORAMANIAN Vojtech KOTOUS Yohan GUILLET Wireless TelecommunicationISEP 2006/2007Tender Project Coverage and Traffic

  2. Outlines • Introduction • Choice of Technology • Mobility Requirements • Coverage and Planning • Traffic • Upgrades and Conclusion

  3. Choice of Technology WiMAX (3.5 GHz) vs WiFi (2.4 GHz): • WiFi’s coverage optimized for indoor environment. • Wavebands for WiMAX can be assigned (3.5 GHz, only frequency allocated by ARCEP for WiMAX due to the French legislation). • Nomadic and mobility (60 km/h) and also regional roaming with WiMAX802.16e. FDD vs TDD : two 15MHz bands on both sides of the 3.5GHz : • The various possibilities of widths of channel for TDD (5MHz, 7MHz, 10MHz) allows fewer losses in the 15 MHz band. • TDD is more efficient in mobility than FDD. • TDD material is less expensive at the present day. • TDD enables adjustment of the downlink/uplink ratio to efficiently support asymmetric downlink/uplink traffic.

  4. Mobility Requirements • Data service up to 60km/hour (802.16e) • Use of Mobile IP tunneling • 2 types of handover supported : Hard Handover and Fast Base Station Switching • Latency, Jitter < 50ms (best case) • EAP-based authentication, flexible key management for handover

  5. Propagation model • SUI model

  6. f1 f2 f3 f4 Channel Bands Necessary band with Roll-off α = 0,2: • 3,5 x 1,2 = 4,2 MHZ / channel => maximum number of channels is 3 for FDD • 5 x 1,2 = 6 MHZ and 7 x 1,2 = 8,4 => possible in TDD (6 MHz + 8,4 MHz < 15MHz) We can share each frequency band : 15 MHz f1 = f3 = 7 MHzf2 = f4 = 5 MHz Free band size: 1 MHz ( 3 MHz ÷ 3) between each channel band and 1MHz at the start and at the end of frequency band

  7. Coverage Size with BPSK modulation (edge of the cell)

  8. Network Planning f4 f1 f1 f2 f3 f2 f3 f4 Different possibilities First solution Third solution f2 + f4 Excellent capacityMore interferences Enough capacityInterferences (f4) f3 f1 f1 f3 f2+ f4 Second solution Forth solution f2 + f4 Very good capacityMoreInterferences Enough capacityGood coverage f3 f1

  9. Services QoS Traffic 2007 Activity Total Amount VoIP 25% 200 000 min/day G.711 5 hours ~730 GBit Websurfing, IP data 55% 3 TBit/day 2 hours 3 TBit Video Conferences 10% include in Data - H.264 2 hours include in Data Mobility 10% 300 GBit 2 hours 300 GBit Total ~4 TBit/day Traffic (1/2) • Environment – Suburban • 200 ≤ population density < 1000 inhabitants per square kilometre • Average user is active for 2 hours/day

  10. Traffic (2/2) • 45 Cells are needed 1st year for 1000 simultaneous users • Capacity upgrades are seen on the graph.

  11. Upgrades and Conclusion • Software upgrade of base stations (802.16e) • Change the type and number of antennas and transmitters • Build new base stations • Change the azimuth of the forth frequency where we need more traffic • Upgrade mobility (macrodiversity)

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