1

Georgen Greem 1

Cell DimensioningCell DimensioningPower Budget Calculation:Power Budget Calculation:Objectives:

1. To achieve a maximum cell area covered using certain equipment .

2. To determine the needed transmit power at the BTS side.

Process:Process:

ACE LossAntenna Diversity

Gain

Feeder Loss

LNA (Optional)

BTS Antenna GainMaximum Path Loss

BTS Transmit Power

BTS Receive Sensitivity

Fade Margin

MS antenna gain, body and cable loss

MS Transmit Power

MS Receive Sensitivity

2

Georgen Greem 2

Uplink Power BudgetUplink Power BudgetUPLINK SIGNAL LEVEL (dBm)

MS Trans Power 33 dBm + 33

Cable Loss 0 dB + 33

MS Antenna Gain 2 dBi + 35

Body Loss 2 dB + 33

Max. Path Loss - 142 dBFade Margin ( 90% cell edge) 12 dB -109

BTS Antenna Gain 17 dBi -121

Feeder Loss 3 dB -104

Diversity Gain 3 dB - 107

BTS Receiver Sensitivity -104 dBm - 104

Note : Frequency Hopping is not included in the budget.

Additional Margin can be introduced to cover the differences between the actual and the ideal BTS location.

Building penetration loss can also be added.

3

Georgen Greem 3

Downlink Power BudgetDownlink Power Budget

0Cable Loss

DOWNLINK

-102 dBmMS Receiver Sensitivity

0Diversity Gain

2 dBiMS Antenna Gain

2 dBBody Loss

12 dBFade Margin ( 90% cell edge)

- 142 dBMax. Path Loss

17 dBi BTS Antenna Gain

3 dBACE Loss

3 dBFeeder Loss

40 dBmBTS Trans Power

- 101

- 101

- 101

-101

-103

-91

+ 52

+ 34

+ 37

+ 40

SIGNAL LEVEL (dBm)