Wireless TelecommunicationISEP 2006/2007

Tender Project Coverage and Traffic

Group C Alexis CHALMOT DE

LA MESLIERE Prem MARIANNIE

Viken TORAMANIAN Vojtech KOTOUS Yohan GUILLET

Outlines

Introduction Choice of Technology Mobility Requirements Coverage and Planning Traffic Upgrades and Conclusion

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

WiMAX 802.16e.

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.

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

Propagation model

SUI model

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f1 = f3 = 7 MHzf2 = f4 = 5 MHz

15 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

f1 f2

f3 f4

We can share each frequency band :

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)

Size with BPSK modulation (edge of the cell)

Coverage

Deep indoor

Indoor Daylight

Outdoor

Trisector BS Size of one cell

Nb of BS

470 m

110

740 m

45

1100 m

21

Quadrisector BS

Size of one cell

Nb of BS

530 m

84

830 m

34

1230 m

16

Different possibilities

First solution

f2 + f4

f3

f1

Second solution

f1

f3

f2

f4

Third solution

f3 f4

f1f2

Forth solution

Network Planning

Excellent capacityMore interferences

Enough capacityGood coverage

Enough capacityInterferences (f4)

Very good capacityMore Interferences

f2+ f4

f1

f1

f3

f3

f2 + f4

Traffic (1/2) Environment – Suburban 200 ≤ population density < 1000 inhabitants per square kilometre Average user is active for 2 hours/day

Services QoS Traffic 2007 Activity Total Amount

VoIP25%

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.2642 hours include in Data

Mobility10% 300 GBit 2 hours 300 GBit

      Total ~4 TBit/day

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

0

200000

400000

600000

800000

1000000

1200000

2007 2008 2009 2010 2011

0

30

60

90

120

150

PC users VoIP users CellsCellsUsers

Year

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)