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How to calculate the power of eRRU3232

Publication Date:  2017-10-24 Views:  80 Downloads:  0
Issue Description

The customer wants to know about the difference between the power of RRUs. 

The first RRU: FunctionModule,eRRU3232,WD5MPSRB1C0,Multi-mode Multi-carriers Remote Radio Unit (TX3600-3800MHz/RX3600-3800MHz,4T4R,With installation kits,SP) which accepts 10W per port.
The second RRU: FunctionModule,eRRU3232,WD5MPSRB1CA,Multi-mode Multi-carriers Remote Radio Unit (TX3670-3700MHz/RX3670-3700MHz,4T4R,With installation kits) which accepts 8Ws per port.

These values are not the same because the customer ordered different equipment configuration.

This result is based on the formula for the output power:

 

Solution

The see the PA value you need to list the below parameters with the LST CELLDLPCPDSCHPA  command:

To list PA parameters related to PDSCH power control for the cell with Local cell identity of 0, run the following command:
LST CELLDLPCPDSCHPA: LocalCellId=0;
The result is shown as follows:
+++    0        2016-03-14 14:54:22
O&M    #806384666
%%LST CELLDLPCPDSCHPA: LocalCellId=0;%%
RETCODE = 0  Operation succeeded.

List Pa parameters for PDSCH power control
------------------------------------------
                     Local cell ID  =  0
               PA adjusting switch  =  Off
PA for even power distribution(dB)  =  -3 dB
               PA for PTP User(dB)  =  -3 dB
             PA for Video User(dB)  =  -3 dB
(Number of results = 1)


---    END

Local cell ID

Indicates the local ID of the cell. It uniquely identifies a cell within a BS.

PA adjusting switch

Indicates the switch for adjusting the PA through power control on the PDSCH. If this parameter is set to ON, the PA is adjusted dynamically when the channel quality is extremely good or bad.

PA for even power distribution(dB)

Indicates the PA to be used when PA adjustment for PDSCH power control is disabled, DL ICIC is disabled, and the even power distribution is used for the PDSCH.

PA for PTP User(dB)

Indicates the PA used for PDSCH power control.

PA for Video User(dB)

Indicates the PA value used in a Video. A proper PA setting helps power control for video services.



The see the PB value you need to list the below parameters with the LST CELLDLPCPDSCHPA  command:

To list the PDSCH configuration of the cell with Local cell ID of 0, run the following command:
LST PDSCHCFG: LocalCellId=0;
The result is shown as follows:
+++    HUAWEI        2013-06-24 16:08:08
O&M    #12379
%%LST PDSCHCFG: LocalCellId=0;%%
RETCODE = 0  Operation succeeded.

Display PDSCHCfg
----------------
                       Local cell ID  =  0
      Reference signal power(0.1dBm)  =  182
                                  PB  =  1
Reference Signal Power Margin(0.1dB)  =  0
   Offset of Ant0 to Tx Power(0.1dB)  =  255
   Offset of Ant1 to Tx Power(0.1dB)  =  255
   Offset of Ant2 to Tx Power(0.1dB)  =  255
   Offset of Ant3 to Tx Power(0.1dB)  =  255
(Number of results = 1)


---    END

Local cell ID

Indicates the local ID of the cell. It uniquely identifies a cell within a BS.

Reference signal power(0.1dBm)

Indicates the cell reference signal power of each physical antenna. However, the cell reference signal power delivered in SIB2 is that of each logical antenna.

PB

Indicates the scaling factor index of the Energy Per Resource Element (EPRE) on the PDSCH. This scaling factor is determined by the value of this parameter and the antenna port. For details, see 3GPP TS 36.213.

Reference Signal Power Margin(0.1dB)

Indicates the cell reference signal power headroom of each physical antenna. This parameter applies only to LTE TDD cells.

Offset of Ant0 to Tx Power(0.1dB)

Indicates the offset of the TX power of physical channel 0 relative to the baseline TX power. The baseline TX power is determined by the system bandwidth, cell reference signal power, Pa, and Pb. If the TX power configurations should be the same between physical channels, set this parameter to 255. If the TX power configurations should be different between physical channels, set this parameter to a proper value based on the actual situation. This parameter applies only to FDD.

Offset of Ant1 to Tx Power(0.1dB)

Indicates the offset of the TX power of physical channel 1 relative to the baseline TX power. The baseline TX power is determined by the system bandwidth, cell reference signal power, Pa, and Pb. If the TX power configurations should be the same between physical channels, set this parameter to 255. If the TX power configurations should be different between physical channels, set this parameter to a proper value based on the actual situation. This parameter applies only to FDD.

Offset of Ant2 to Tx Power(0.1dB)

Indicates the offset of the TX power of physical channel 2 relative to the baseline TX power. The baseline TX power is determined by the system bandwidth, cell reference signal power, Pa, and Pb. If the TX power configurations should be the same between physical channels, set this parameter to 255. If the TX power configurations should be different between physical channels, set this parameter to a proper value based on the actual situation. This parameter applies only to FDD.

Offset of Ant3 to Tx Power(0.1dB)

Indicates the offset of the TX power of physical channel 3 relative to the baseline TX power. The baseline TX power is determined by the system bandwidth, cell reference signal power, Pa, and Pb. If the TX power configurations should be the same between physical channels, set this parameter to 255. If the TX power configurations should be different between physical channels, set this parameter to a proper value based on the actual situation. This parameter applies only to FDD.



So if the RS configuration 122, then it is 7.5 (watts)



If RS is configured for 134, it is 10 (watts)



//these values were obtained with a Huawei internal tool

END