a broadband wireless access network for the city of lyon

A Broadband Wireless Access network for the city of Lyon

Group C Alexis CHALMOT DE

LA MESLIERE Prem MARIANNIE

Viken TORAMANIAN Vojtech KOTOUS Yohan GUILLET

Wireless Telecommunication ISEP 2006/2007

http://www.isep.fr/index.php

http://lyontel.free.fr

ChoiceChoice



Nomadic and mobility (60 km/h) and also regional roamingwith Wimax 802.16e (SOFDMA modulation).

TDD enables adjustment of the downlink / uplink ratioto efficiently support asymmetric downlink / uplink traffic.

Two 15 MHz TDD bands on both sides of the 3.5GHz

With the Wimax technology, we assign to our network the bigger capacity and we share all the resources for everybody.

Choice of technology

only licensed frequency for Wimax in France:



CoverageCoverage



Size with BPSK modulation (edge of the cell)

Coverage

1230 m

25

830 m

38

530 m

90

Size of one cell

Nb of BS

Quadrisector BS

1100 m

27

740 m

41

470 m

94

Size of one cell

Nb of BSTrisector BS

OutdoorIndoor Daylight

Deep indoor



InterferencesThe computing of the C/I is very important to make a choice of cell patern.

C

I=

C

∑ I n=

α P e R−γ

∑α P e D n−γ

0.287 7.794

Less than 7.794

2.404



Network architecture synthesisWireless Access

Wimax Network architecture

- 4 antennas by station- 4 frequencies by station- high capacity : 10x4 actives users- Voice, Video conference, websurfing possible

- Trisector Base Station- Important size cell- Low interference - High C/I (up to 7 dBm)- Best quality



TrafficTraffic



Traffic (1/3) Environment – Suburban 200 ≤ population density < 1000 inhabitants per square kilometre Average user is active for 2 hours/day

Services QoSTraffic 2007

ActivityTotal

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



Number of cell based on criterium (2/3)



45 Cells are needed 1st year for 1000 simultaneous users

Capacity upgrades are seen on the graph.

Traffic (3/3)



TechnologyTechnology



Antennas : European Antennas

sector 120 °Power : 13,5 dBm

Base Station : Ericsson

Type : RBS 6418 Power : 40 dBmConfiguration: 5 MHz + 7 MHz TDD duplex mode

CPE : Alvarion

Type: BreezeMax (compatible)

Choice of materials



CAPEX / OPEXCAPEX / OPEX



2007 2008 2009 2010 20110

5

10

15

20

25

30

35

40

45

50

Cost(Million ecus)

Millions

Year

CAPEX evol

CAPEX evolution per year



2007 2008 2009 2010 2011500

501

501

502

502

503

503

504

504

Cost (Kecus)

Thousands

Year

OPEX

OPEX per year



-60-40

-20

020

40

60

80100

120

140

Cost (million ecus)

Millions

2007 2008 2009 2010 2011 Total 2007 to2011

Years

CAPEX+OPEXINCOMEBALANCE

CAPEX/OPEX vs

Income (Optimistic)



-50

-40

-30

-20

-10

0

10

20

30

40

50

Cost (million ecus)

Millions

1 2 3 4 5Number of YearsBalance per year

We are profitable after four years

Total balance after each year from 2007 (optimistic)



ConclusionConclusion



Conclusion and Upgrades

Fully operationnal Mobile Wimax solution from 2007

Full coverage and enough capacity for Lyon

Profitability reached after four years (2010)

Big profits to improve the network even more after 2010

Optimisation of the load of the network

Different frequency band for specific areas

Improved Mobility (speed,handover)


Thank you for your attention

Any questions ?



a broadband wireless access network for the city of lyon

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