UL Total Loss 2
The 4 parameters below are used to calculate UL Total Loss 2.
UL Total Loss 2 = FSL - BDA Donor Antenna Gain + BDA Donor Cable Loss – Donor Site TX/RX Delta (dB)
• BDA Donor Cable Loss (user fill in): Fill in based on design / deployment.
• BDA Donor Antenna Gain (user fill in): Fill in based on design / deployment.
• D. (Mi) to Donor Site/FSL (user fill in): User fills in the distance to Donor Site and the system will
calculate the FSL (Free Space Loss).
• Donor Site TX/RX Delta (user fill in): BTS RX line loss; acquired from licensee. A negative value
would represent an effective Gain on the BTS RX line (e.g. Tower Top Amplifier).
The user can then decide which UL Total Loss value to use.
• Click on the <Choose> button in the <Measurements/Final Loss Calculations> section to select UL
Total Loss 1, UL Total Loss 2, or to enter a manual value.
Figure 133: Commissioning Tool – Selecting UL Total Loss Parameter
Donor Site RX RSSI Range (MAX and MIN Acceptable Signal Received by Donor Site)
The Max RSSI and Min RSSI need to be entered to calculate the BDA UL Power and UL Gain setting.
If only one number is provided, the user must still estimate the other one.
For example:
If only the MAX RSSI is provided at -95dBm, the MIN RSSI could be -105dBm, or -110dBm, depending on
the minimal level that the radio still works. This depends on the requirements from the jurisdiction or licensee,
and the sensitivity of the donor site.
If only the MIN RSSI is provided at -95dBm, the MAX RSSI could be -90dBm or -85dBm, depending on the
requirements from the jurisdiction or licensee. The higher the Max RSSI number used, the higher the UL
Power and UL Gain will be suggested. Use the lowest MAX RSSI possible to minimize the BDA
generated noise levels. The same number can be used for both Max RSSI and Min RSSI in order to
minimize UL Power and UL Gain.
In most cases, using the Max RSSI and Min RSSI requirement provided by the licensee for the BDA output
and gain setting calculation, the broadband noise floor generated from the device will be lower than thermal
noise before reaching the donor site and cause no impact to Donor Site Sensitivity. However, it is still
required to calculate and/or measure the broadband noise for all cases. This calculation is NOT covered in
this manual.
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