vladdd
2014-10-28, 11:16 PM
Dear Professionals,
My apologies for the uneducated question, but I have not been able to find a straightforward answer to it in any specifications.
Please let me elaborate:
Let's say we have an HNB with 2 Watts of power allocated for the common pilot channel. This would mean that the radiated signal power at the HNB site (with 1dBi antenna attached) should be around 33-34dBm (with only 1 test UE in idle mode attached).
Now, by using the mobile phone to test the reception, we can see that that the RSCP power will be -25dBm on the site and will gradually reduce when increasing the distance between the HNB and UE (as expected).
What I don't understand, is how exactly the radiated CPICH power and measured RSCP values are correlated. My goal is to calculate the exact path loss value in dB by using only these 2 parameters.
I know the RSCP range in UMTS FDD is [-25;-120] by specification, but how does it correspond to standard power measurements performed with an RF power meter (in case we could measure only the CPICH power)?
Experimentally, when only the test UE is attached to the HNB, I can see that the power meter measures ~27 dBm a couple of meters away from it. This will correspond to -36 dBm RSCP on the test phone (the values are not exact, I'm just using them to illustrate my point).
I will be immensely grateful if anyone could explain this relation to me in an understandable way.
Regards,
Vlad
My apologies for the uneducated question, but I have not been able to find a straightforward answer to it in any specifications.
Please let me elaborate:
Let's say we have an HNB with 2 Watts of power allocated for the common pilot channel. This would mean that the radiated signal power at the HNB site (with 1dBi antenna attached) should be around 33-34dBm (with only 1 test UE in idle mode attached).
Now, by using the mobile phone to test the reception, we can see that that the RSCP power will be -25dBm on the site and will gradually reduce when increasing the distance between the HNB and UE (as expected).
What I don't understand, is how exactly the radiated CPICH power and measured RSCP values are correlated. My goal is to calculate the exact path loss value in dB by using only these 2 parameters.
I know the RSCP range in UMTS FDD is [-25;-120] by specification, but how does it correspond to standard power measurements performed with an RF power meter (in case we could measure only the CPICH power)?
Experimentally, when only the test UE is attached to the HNB, I can see that the power meter measures ~27 dBm a couple of meters away from it. This will correspond to -36 dBm RSCP on the test phone (the values are not exact, I'm just using them to illustrate my point).
I will be immensely grateful if anyone could explain this relation to me in an understandable way.
Regards,
Vlad