Link Budget Base Station Subsystem Calculation I

Link Budget of Base Station Subsystem, there are two main parts: Uplink (MS transmit to BTS) and Downlink (BTS transmit MS).

 1/ Uplink Path Loss
Mobile Station MS
To calculate Effective isotropic radiated power(EIRP) we need below parameter:

-          MS Transmitter power

-          Loseon Feeder and Connector

-          Antenna Gain  

EIRP = Transmitter power + Gain Antenna - Feeder and Connector  loss

Base Station

To calculate Minimum Reception Level​ we need below parameter:

-          Lognormal margin

-          Interference margin

-          Channel margin

-          BTS sensitivity

-          Lose BTS slant polarization

-          Body loss

-          Lose on Jumper ​and Connector

-          Lose on Feeder

-          Diversity Gain

-          Receive Antenna Gain

Minimum Reception Level = Receive Antenna Gain + Diversity Gain – Feeder loss -  Jumper and Connector loss - Body loss -​BTS slant polarization loss - BTS sensitivity - Channel margin -Interference margin- Lognormal margin   
Uplink Path Loss Mobile part

Allowable Path loss (Uplink) = EIRP + Minimum Reception Level

2/ Downlink Path Loss

Base Station

To calculate Effective isotropic radiated power(EIRP) we need below parameter:

-          Base Station Transmitter power 

-          Antenna Gain

-          Feeder Loss

-          Feeder and Connector loss

-          BTS stant polarization loss

EIRP =Transmitter power + Gain Antenna - Feeder Loss - Connector and Jumper loss - BTS slant polarization loss

Mobile Station

To calculate Minimum Reception Level​ we need below parameter:

-          Feeder and Connector loss

-          Antenna Gainin

-          MS sensitivity

-          Body Loss

-          Lognormal margin

-          Interference margin

-          Channel margin

Minimum Reception Level = Antennat Gain - Feeder Connector loss - MS sensitivity - Body loss - Lognormal margin -  Interference margin - Channel margin  

Downlink Path Loss Base Station part

Allowable Path Loss (Downlink) = EIRP + Mimimum Reception Level

Herewith below example
General Character of Position

Character of position that we install Base Station

-          Antenna Type: APX906515L-T0-0

-          Antenna height: 26m

-          Region: urban

-          Feeder Type: HFC22D(A)LS Cable 2006

-          Feeder loss: 3.71dB per 100m

-          Feeder length: 46m

Please let see calculation part Link Budget Base Station Subsystem Calculation II