5G NR Total Transmit Power | Maximum Cell Transmit Power | Reference Signal Power

The Reference Signal Power and the total transmit power of the cell can calculated by using a single channel power using following formula,

• Maximum Transmit Power indicates the transmit power in dBm per single channel
• Reference Signal Power is the power in dBm per RE of single channel
• RBcell indicate total RB number based on the cell bandwidth each RB with 12REs

Example Calculation
Consider a system is configured with Max Transmit Power as 40 dBm (10 watt per channel) and calculation can be done with different sub-carrier spacing
Sub-carrier Spacing 15 KHz 270 RBs with 50MHz

• Reference Signal Power = 40 – 10 x log10（270 x 12)  = 40 – 35.10
• Reference Signal Power = 4.9 dBm

Sub-carrier Spacing 30 KHz 273 RBs with 100MHz

• Reference Signal Power = 40 – 10 x log10（273 x 12)  = 40 – 35.15
• Reference Signal Power = 4.85 dBm

Sub-carrier Spacing 60 KHz 130 RBs with 100MHz

• Reference Signal Power = 40 – 10 x log10（130 x 12)  = 40 – 31.93
• Reference Signal Power = 8.07 dBm

If you not able to co-related the carrier spacing with RB count please read our older post 5G New Radio Throughput Calculation embedded PDF page 6 or NR Resource Block Definition and RBs Calculation
The total transmit power of NR base station can be calculated taking Max Transmit power and No. of Tx antenna into account with following formula.

Consider same 40 Bm as cell Max power, the total Tx power can be calculated for different antenna configurations e.g. 8 antenna , 16 antenna, 64 antenna and 128 antenna systems.

• Total Transmit Power with 8 Tx Antenna = 40 + 10 x log10 (8) = 40 + 9.03            =49.03 dBm
• Total Transmit Power with 16 Tx Antenna = 40 + 10 x log10 (16) = 40 + 12.04       =52.04 dBm
• Total Transmit Power with 64 Tx Antenna = 40 + 10 x log10 (64) = 40 + 18.06      =58.06 dBm
• Total Transmit Power with 128 Tx Antenna = 40 + 10 x log10 (128) = 40 + 21.07   =61.07 dBm

Note: Total Transmit Power had included antenna gain (directive gain in dBi) which is used to calculated Equivalent Isotropical Radiated Power (EIRP).
Related Post: http://www.techplayon.com/5g-nr-total-transmit-power-maximum-cell-transmit-power-reference-signal-power/

LOS Survey Process Tutorial

  Survey Process consists of five basic steps;

a) Prepare the Site documentation
b) verify the Site location
c) Finding Problems in-between the path
d) Path profile
e) Overall survey report.
Site Documents
a) Site location maps to be find with Location Land Mark.
b) If it is existing site means, get site information from other customer.
Collection of details of the proposed site;
a) Observe the Absolute Mean Sea Level, height of tower, heights of antenna and angles.
b) Take photographs of site, it used for verification in future.
c) Marking of tower center from minimum three reference points
transmitters and receivers Antennae frequencies.
e) Soil samples can be taken for laboratory testing. This will be useful for economical design of the tower.
Identification of critical points along the path
a) On the maps two sites are joined by a thin straight line.
b) Determine the height, width of all obstructions along the path and HASL at each point for all potential obstructions.
c) Visit every likely critical point to ascertain its height and check other parameters.
d) Determine the width of water bodies, other reflecting points falling along the route.
e) Take mirror tests if after calculations, it is found, that, it is feasible
Generating LOS path profile;
a) It can be manually or by computerized software.
b) Hop wise data required is given below.
About hop
AMSL of each site
Hop distance (If co-ordinates are fed to computer software, you get hop distance    and azimuth angles)
HASL of each obstruction and its height including near-end obstructions, Clearance criteria being adopted. Say  Cl=k 4/3 + 100% FFZ and OR Cl=k 2/3 + 60% FFZ
Frequency band of operation.
c) With the above parameters antenna heights in each direction of operation can be worked out and hence the tower height at each sight.
Generating LOS report
a) Site Data( Height, Angle , Azimuth)
b)Any Disturbance in Path
c)Photograph about Site for Future Identification.
Detailed Survey Report
a) Determine following parameters.
Transmitter power, Size and gain of antenna’s for main and diversity, transmission line losses, Receiver threshold  Signal to noise ratio, Fade Margin
b)The complete exercise can be worked out manually with the help of a calculator or different Software’s available for Path Loss Calculations.