3D BSS geometric indicator for WLAN planning

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3D BSS geometric indicator for WLAN planning

Pr. Alexandre CAMINADA

UTBM / SET and INRIA /ARES

IEEE SoftCOM’07, Split, 27-29/09/2007

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Main topic

WLAN planning: locate transmitters and set their parameters

Large indoor/outdoor networks (several buildings or floors): algorithms are

required

Planning concept issued from mobile

networks: cells are structured => MODEL

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The BSS structure problem

2. The geometric indicator

3. The tests

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Radio network planning is

Selecting several locations (set of (x,y,z))

To install transmitter pattern (among a set)

With a given orientation (among 360°)

At a given transmitting power (among 5)

And a given frequency channel (among F)

At the lower cost and the higher QoS

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As for instance in this 3D

building

252 (x,y,z)

2 patterns

8 directions

4 powers

9,072 transmitter configurations 2^9,072 networks

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Let put a transmitter somewhere in the 2

^nd

floor

3^rd 2^nd

1^st

3D

propagation

3D

coverage

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Let put several transmitters and look at the best server signal

3^rd: 4 AP 2^nd: 5 AP

1^st: 3AP

Transmitter location

Best signal

1

2 3 4 5 channels

8 neighbours

5 channels

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The geometric indicator

3. The tests

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Avoiding bizarre cells

Line instead of circle

Many components instead of one

White zones

fulfilled by other cells

We want circles

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Using the model for WLAN needs a 3D measurement

{

^{( , )}^{i j} ^/ ^{( , )}^{i j} ^q

}

C = b F > S

1. Identify the BSS

( )

^{, ,} ^{, ,}

( )

'

8 6

i j k k

i j k

b C

k

k k

V b G C

C π C

= ∈

× − × ×

∑

2. Compute BSS

geometry on one floor

( ) ( )

1

'

k K

k

WLAN k

k

G C C G C

C

=

∑

3. And on 3D

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The tests

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Control on BSS geometric

Without control

With control

3^rd 2^nd

1^st

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Impact on neighbourhood

Without control

With control

3^rd 2^nd

1^st

8 neighbours 4 channels

4 channels

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Impact on location and cost

Without control 12 AP

With control 12 AP

3^rd 2^nd

1^st

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Impact on interference on GSM bench (C/I)

Without control With control

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Some further steps

Evolution of networks with and without geometry control

Frequency assignment to assess its real complexity

Experiments

3D BSS geometric indicator for WLAN planning