table of Contents
1 Group definition of power configuration class parameters 3
1.1 Principle Overview 3
1.2 Parameter Description 4
1.3 Setting suggestions 5
2 Calculation of Nokia EnodeB reference signal power 5
2.1 Nokia EnodB parameter definition 5
2.2 Nokia Pa, Pb Northbound Mapping 6
2.3 Pa, Pb North Direction Calculation Formula 6
3 EnodeB reference signal power verification method 7
4 Conclusion 8

1 Group definition of power configuration class parameters
1.1 Principle Overview
Since the intra-cell interference of LTE is far weaker than inter-cell interference, and the wideband system requires frequency selective gain, there is no power control process in the downlink design, but only the downlink is designed. A power allocation scheme for specifying the power of the downlink CRS RE and the PDSCH RE.
1) CRS RE power: The protocol high-level parameter referenceSignalPower specifies the transmit power of the pilot per RE, that is, the reference signal transmit power.
2) PDSCH RE power: The PDSCH RE power is determined by setting the ratio of the PDSCH RE power to the CRS RE power with the CRS RE power as a reference point. There are two types of PDSCH RE locations: the first type is the PDSCH EPRE with no CRS RE on the symbol, or the other is the PDSCH EPRE with the CRS RE, that is, the B type; therefore, the two types are represented by the sum. The ratio of PDSCH RE power to CRS RE power.

In order to constrain the ratio range of the two types of PDSCH RE power, the protocol uses the high-level parameter PB to represent / ;
PB=Type PDSCH EPRE/A PDSCH EPRE
PA=A class PDSCH EPRE/RS EPRE
In some scenarios where the basic coverage is high and the throughput rate is not high (such as a tunnel), the CRS may be one of the restricted channels. The CRS power boost function can be implemented by setting three parameters: referenceSignalPower, PA and PB. In general, there are two methods for CRS transmit power boost:
1) Under the condition that the RRU total transmit power is allowed, the referenceSignalPower value is directly increased, and the PA and PB remain unchanged. That is, the CRS transmission power is increased while the PDSCH transmission power is increased.
2) Under the condition that the total transmit power of the RRU is limited, increase the value of the referenceSignalPower, and lower the PA to keep the PB unchanged. That is, the CRS transmission power is increased, and the PDSCH transmission power is reduced.
The current method is because the PDSCH EPRE transmit power of Class A is not used, and the PDSCH EPRE of Class A of the RS has no transmit power but is punctured to increase this power to On the CRS, the CRS transmit power is boosted. Keep the PDSCH transmit power unchanged.
1.2 Parameter Description

1.3 Setting suggestions

2 Nokia reference signal power calculation
2.1 Nokia EnodeB related parameter definition
On the Nosie OMC, the parameters related to the CRS power boost function are shown in the following table. The correspondence between these parameters and the protocol parameters is attached to the table.

2.2 Nokia Pa, Pb northbound mapping
Pa=- ( dlpcMimoComp + dlRsBoost )

2.3 Pa, Pb north direction calculation formula
 For versions of Pa and Pb that can be output, you can get these two values ​​directly.
 For versions that cannot output Pa, the other parameters obtained in the north direction can be calculated:
Pa=- ( dlpcMimoComp + dlRsBoost )
 The Pb obtained in the network interface is obtained by mapping the following table.

In the Nos. CRS power boost function, the OMC parameters and protocol parameters are calculated as:
Room split single channel: pMax -10log10(12N_PRB)+dlRsBoost
Room dual channel: pMax -10log10(12N_PRB)+dlRsBoost
Macro Station 8 Channel: pMax-10log10(12N_PRB)+dlRsBoost+SECTOR_BF_GAIN

Room single channel: pMax -10log10(12N_PRB)+dlRsBoost=40-30.8=+3=12.2
Room dual channel: pMax -10log10(12N_PRB)+dlRsBoost=12.2
Macro Station 8 Channel: pMax -10log10(12N_PRB)+dlRsBoost+SECTOR_BF_GAIN=40-30.8+3+4=16.2

3 EnodeB reference signal power verification method
3 EnodeB reference signal power verification method
By checking the SYB message in the DT test software LOG data, you can check the transmit power of the actual CRS reference signal of the cell:
1.8 channel macro station screenshot:

2.2 channel room screenshots:

4 Conclusion
According to the group-defined parameter specification, the district company requires referenceSignalPower, that is, the reference signal transmission power is greater than 15.2. According to the Nokia parameter settings, pMax must be set to 40dBm (single channel power 10W), while turning on the downlink RsBoost.

The RS power [ENBAJ12] reported by the network optimization platform in the north is reported in the following calculation manner:

Room single channel: pMax-dlCellPwrRed-10log10(12N_PRB)+dlRsBoost
Room Dual Channel: pMax-dlCellPwrRed-dlpcMimoComp-10log10(12N_PRB)+dlRsBoost
Macro station: pMax-dlCellPwrRed-dlpcMimoComp-10log10(12N_PRB)+dlRsBoost+SECTOR_BF_GAIN

Where SECTOR_BF_GAIN shall be calculated according to: LNCEL.dlSectorBFWeightProfName:
Customized profile 1: 6dB (assuming profile 1 has a weight of [1 1 1 1])
customized profile 2: 1dB (assuming profile 2 has a weight of [0.56 0.56 0.56 0.56])
all other option: 4dB