Cell Load in Precents (2G E*******)

[thewatcher]

Hi all,

i have E******* 2g network supporting full rate and half rate tch.
i would like to know how to calculate the TCH load (utilization) in precents.

i tried the formula for FR:
TCH_UTIL = ((TFTRALACC/TFNSCAN) * TAVASCAN) / TAVAACC
but when i tring add the HR percents, i get more then 100% percents in such cases
(The Formula:
(((TFTRALACC/TFNSCAN) * TAVASCAN) / TAVAACC) + (((THTRALACC/THNSCAN) * TAVASCAN) / (TAVAACC))

Thanks in advance for you assistance.
Steve

[gprastomo]

Hi,

I think, the TCH/Trunk Utilization should be based on Erlang B formula with specified GoS (eg 1% or 2%).

Then you can divide the Traffic Carried by Traffic offered of the corresponding Number of TCH with Specified GoS.

br



Hi all,

i have E******* 2g network supporting full rate and half rate tch.
i would like to know how to calculate the TCH load (utilization) in precents.

i tried the formula for FR:
TCH_UTIL = ((TFTRALACC/TFNSCAN) * TAVASCAN) / TAVAACC
but when i tring add the HR percents, i get more then 100% percents in such cases
(The Formula:
(((TFTRALACC/TFNSCAN) * TAVASCAN) / TAVAACC) + (((THTRALACC/THNSCAN) * TAVASCAN) / (TAVAACC))

Thanks in advance for you assistance.
Steve

[thewatcher]

gprastomo,

Thanks you for the quick reply.

We are working on a BI system that uses the E******* 2G KPIs.
I was hoping that someone can share the formula for TCH utilization since the E******* documentation do not specify what to do in the event the Half-Rate is used.

in the liked below is a picture with the formulas I use:
http://www.imagebam.com/image/6de0d1149943625

when I change the TF to TH I get more then 100% for cells.
should I divide the HR erlang traffic by half?

Thanks.

[Darko]

Hi,

It won't work your way. This formula works only for FR system.



gprastomo,

Thanks you for the quick reply.

We are working on a BI system that uses the E******* 2G KPIs.
I was hoping that someone can share the formula for TCH utilization since the E******* documentation do not specify what to do in the event the Half-Rate is used.

in the liked below is a picture with the formulas I use:
ImageBam - Fast, Free Image Hosting and Photo Sharing (http://www.imagebam.com/image/6de0d1149943625)

when I change the TF to TH I get more then 100% for cells.
should I divide the HR erlang traffic by half?

Thanks.

[thewatcher]

thanks Darko,

so what should I do if there is FR+HR in the network?

[Darko]

Hi,

I suggest you look at some old discussions:

here you go:

http://www.finetopix.com/post-processing/4975-2g-expansion-calculations.html
http://www.finetopix.com/live-optimization/9017-capacity-forecasting.html
http://www.finetopix.com/e*******/22010-offered-traffic-business-objects.html
http://www.finetopix.com/requests/20654-calculating-utilization.html