Huawei 2G path balance - High DL losses

[kyokuman]

Hi,

Using Huawei, and No TMA installed, I have Negative values for Pathbalance. Showing DL losses are more important in DL !

How is it possible? I am sure not having any Hardware problem.
Why DL losses can be higher

How TRX power can affect pathbalance, as if im not mistaken, pathbalance is the difference of pathloss !


Thanks for your help!

[rimoucha]

Hello,

Path balance is defined as follows:

Uplink/downlink balance = uplink path loss - downlink path loss = (actual TX power of the UE - uplink receive level) - (TRX power on top of the cabinet - downlink receive level)

Generally speaking,if the path balance is between -9dB & 9dB it's acceptable but if you have greater values then it's an issue to investigate.
High DL losses may indicate faults in the TX/RX channel, such as the TRX and the antenna.... But first you should verify that power level is OK (the parameters to check are Power level and Power Type)

Best regards,

[kyokuman]

Thanks. What do you mean by Power Type?


But my question was rather that :

- Why -9dB is ok? what makes DL pathloss bigger by 9dB than UL?

- Why adjusting TRX power can affect pathbalance, as pathbalance is the difference of path loss. (Which is difference between received level and Transmit power). Example, if u transmit less, u gonna receive less, but pathloss is same....

Thanks for help!

[Md.Moniruzzaman]

This is due to different frequency band in Uplink & Downlink.
Pathloss has a relationship with Transmit frequency
If Transmit frequency high Pathloss high.
So if use FDD then there will clear difference in Uplink & Downlink Pathloss

[kyokuman]

Hi,

Thanks. Yes I agree with that.

But why recommending power adjustment (Huawei document) to help balancing equally the pathbalance?