PRACH Propagation Delay

[Rodbar]

Could anyone tell me how can I extract the information regarding PRACH propagation delay from Huawei RNC?

I used to analyse this KPI to look for overshooting cells in Nokia-Siemens RNC, but I don't know how to extract the same information from Huawei RNC.

Thanks in advance!

Rodrigo Barreto

[adewijaya]

using NASTAR (Statistic tools from Huawei)

[Rodbar]

Unfortunately we don't have access to Nastar Tool.

Do you know another way to get this KPI from Huawei RNC?

Thanks!

Rodrigo Barreto

[adewijaya]

Nope, from M2000 i didn't got this. Only with NASTAR

[qaqa]

hi man

the only way to get if not having the CHR analyzer is by doing the IOS tracing for the cell. you will get the propagation delay after the PRACH is sent. you will need to filter out this information and do some magic calculations to estimate you PD.
later on I will post a detailed way to do it :-)

[adewijaya]

already done yet or not my frend?

[Rodbar]

Sorry, but I have no idea of how it could be done. Could you explain it for me?

Thank you very much!

[adewijaya]

hi man

the only way to get if not having the CHR analyzer is by doing the IOS tracing for the cell. you will get the propagation delay after the PRACH is sent. you will need to filter out this information and do some magic calculations to estimate you PD.
later on I will post a detailed way to do it :-)

@qaqa, do you have some update about this request?

[qaqa]

Hi guys
as promissed, attached is a snapshot of an IOS tracing for RAN12. If you look at it you will see a proper message called:" Propagation delay". going to message details window you see ucRachPropagDelay message.to compute your mobile_Distance use this formula:

Mobile_Distance (m)=(ucRachPropagDelay+1.5)*3*78

ucRachPropagDelay= you extract from the message.
3= is the measurement resolution (3 chips)
1.5= is a correction parameter for HW system. in 3GPP (25.435) the formula doesn't include this value.
78 (m)= is the Chip distance.

in this case, the mobile is about (4+1.5)*3*78=1287m

Cheers,

[vasili_koslov]

Hi gaga,

thanks for shared. I wanna ask some questions.Please Could u explain "measurement resolution" and " chip distance"? And How I get them,Where?

Hi guys
as promissed, attached is a snapshot of an IOS tracing for RAN12. If you look at it you will see a proper message called:" Propagation delay". going to message details window you see ucRachPropagDelay message.to compute your mobile_Distance use this formula:

Mobile_Distance (m)=(ucRachPropagDelay+1.5)*3*78

ucRachPropagDelay= you extract from the message.
3= is the measurement resolution (3 chips)
1.5= is a correction parameter for HW system. in 3GPP (25.435) the formula doesn't include this value.
78 (m)= is the Chip distance.

in this case, the mobile is about (4+1.5)*3*78=1287m

Cheers,