ACHMAD SALSABIL
RAN 3G/4G
17 September 2020
Upon completion of this course, Audience will be able to :
• Understand How to Calculate Output Power Maximum
• Understand How to Setting ReferenceSignalPwr and Limited Values
 The value of Pmax_out must be less than or equal to the maximum transmit power of the RRU or RFU
that provides the cell coverage.
 Pmax_out Query Method
 Run the DSP CELL command to query the value of the Maximum transmit power(0.1dBm) parameter. This parameter
indicates the maximum transmit power of a single antenna channel of a cell (1T1R)
 Multiply the value of the Maximum transmit power(0.1dBm) parameter by the number of transmit channels
of a cell LST CELL to obtain the value of Pmax_out
 If Maximum transmit power = 43dBm ~ 20W (for Single Antenna Channel), then
 For Dual Antenna Channel (2T2R/MIMO 2*2) ~ 20W * 2 = 40W
 Pmax_out Calculation Formula
 If the TxBranch.TXMAXPWR parameter is configured, Pmax_out equals the value of
the TxBranch.TXMAXPWR parameter
 If the TxBranch.TXMAXPWR parameter is not configured, the calculation formula is as follows:
Pmax_out = MAX{Type A (Pmax_out), Type B (Pmax_out)}
Pmax_out = MAX{Type A (Pmax_out), Type B (Pmax_out)}
Where :
 Type A (Pmax_out) is the maximum transmit power configured for one type A symbol.
The calculation formula is as follows :
 Type A ~ PowerFactorRatio = 10^PaPcOff/10
PaPcOff = DB_3_P_A(-3 dB) ~ for Dual Antenna or Four Antenna (LST CELL : TxRxMode) (LTE Baghdad
Configuration)
PaPcOff = DB_0_P_A(0 dB) ~ for Single Antenna (LST CELL : TxRxMode)
 PowerFactorRatio = 10^(-3/10) ~ 0.5
 Type B (Pmax_out) is the maximum transmit power configured for one type B symbol.
The calculation formula is as follows :
 Type B ~ PowerFactorRatio = 10^PaPcOff/10 x ρB/ρA
PaPcOff = DB_3_P_A(-3 dB) ~ for Dual Antenna or Four Antenna (LST CELL : TxRxMode) (LTE Baghdad
Configuration)
ρB/ρA = this values from Pb = 1 (LST PDSCHCFG)
Or from the table :
LTE Huawei in Baghdad ~ BW 5Mhz = 25 RB
 Type A (NRE) = Number of REs per RB x Number of RBs in a 5 MHz cell x Number of antennas = 12 x 25 x 2 = 600
 Type B (NRS) = Number of RSs per RB x Number of RBs in a 5 MHz cell x Number of antennas = 2 x 25 x 2 = 100
 Type B (NRE) = Number of REs per RB x Number of RBs in a 20 MHz cell x Number of antennas = 8 x 25 x 2 = 400
 Pmax_out = MAX {Type A (Pmax_out), Type B (Pmax_out)} ≤ 40 W
Where ;

Type A (Pmax_out) = ReferenceSignalPwr x PowerFactorRatio x Type A (NRE)
= ReferenceSignalPwr x 0.5 x 600
= 300 x ReferenceSignalPwr

Type B (Pmax_out) = ReferenceSignalPwr x Type B (NRS) + ReferenceSignalPwr x PowerFactorRatio x Type B (NRE)
= (ReferenceSignalPwr x 100) + (ReferenceSignalPwr x 0.5 x 400)
= 300 x ReferenceSignalPwr
 Based on the preceding calculation results, we can can infer that:

Pmax_out = 300 x ReferenceSignalPwr ≤ 40 W

ReferenceSignalPwr ≤ 133.33 mW = 21.23 dBm

The value of the ReferenceSignalPwr parameter cannot be greater than 21.23 dBm.
 Reference signal Power limited by Bandwidth, more bandwidth allocation, less Reference signal power
 Reference signal Power limited by Number of Antenna, more antenna required, less Reference signal power
 Reference signal power can be increase with power upgrade in term Bandwidth and Number of Antenna are Fix
 Tuning Pb / PaPcOff / will affecting Reference signal power, take in those parameters considering before change
Power Calculation
Category
Power
MO
Parameter
Remark
CellCeSchCfg
Coverage Level
Tune When Needed
PDSCHCFG
ReferenceSignalPwr
This Parameter like CPICH in 3G WCDMA
CellDlpcPdschPa
PaPcOff
This Parameter like CRS Gain in Ericsson
PDSCHCFG
Pb
The scaling factor index of the Energy Per Resource Element (EPRE) on the PDSCH
CellChPwrCfg
PcfichPwr
Power for CFI Channel
CellChPwrCfg
PbchPwr
Power for BCH Channel
CellChPwrCfg
SchPwr
Power for SCH Channel
CellChPwrCfg
DbchPwr
Power for Dynamic BCH Channel
CellChPwrCfg
PchPwr
Power for Paging Channel
CellChPwrCfg
RaRspPwr
Power for RACH Respon
CellChPwrCfg
PrsPwr
Pilot Power
CellChPwrCfg
DediDciPwrOffset
Power for DCI (Downlink Control Information) ~ PDCCH
CellDlpcPhich
PwrOffset
Power for PHICH (Hybrid ARQ Indicator Channel)
CellDlpcPdsch
CcuPa
Power for Ue in CCU => Cell Centre Users
CellDlpcPdsch
CeuPa
Power for Ue in CEU => Cell Edge Users
CellChPwrCfg
AntOutputPwr
Power for the entire channel bandwidth at the antenna port