UL Load Factor (%)

[arisondang]

Today, i've finished calculation for all cells inside one cluster with granularity -30 min (i use formula with RTWP and Back_noice). Result looks good. Values from 0 to 93%. But one problem, some of them has negative value. It means that RTWP lower than Back_noise. Is this normal? What do you think?

What do you mean back_noise? Is it Noise Floor or (Thermal noise+ Noise figure)?
If yes, i don't think its possible RTWP is lower than Back Noise..

As I know, RTWP= Noise Floor + Noise Rise
so RTWP must be higher than Noise Floor..

If you want to know relation between EUN and RTWP,
you have to calculate UL load per user, and then calculate UL Load Cell based on RTWP, and you can get max EUN number..

Thanks

[_lisi4king]

What do you mean back_noise? Is it Noise Floor or (Thermal noise+ Noise figure)?
If yes, i don't think its possible RTWP is lower than Back Noise..

As I know, RTWP= Noise Floor + Noise Rise
so RTWP must be higher than Noise Floor..

If you want to know relation between EUN and RTWP,
you have to calculate UL load per user, and then calculate UL Load Cell based on RTWP, and you can get max EUN number..

Thanks

I mean, formula from Huawei HedEx

UL load factor = 1 - (cell background noise/UL RX total wideband power)

And cell background noise - -112+(Step-1)*0,1, Step - this is value from settings. On my Network - it is 6,1 dBm

[arisondang]

I mean, formula from Huawei HedEx

UL load factor = 1 - (cell background noise/UL RX total wideband power)

And cell background noise - -112+(Step-1)*0,1, Step - this is value from settings. On my Network - it is 6,1 dBm

Basicly,
your formula comes from basic UL Load Formula = 1- Pn/Itotal...
(please check in book WCDMA for UMTS page 261,edited by Harri Holma)

Pn= Background and Receiver Noise= Noise Thermal+Noise Figure= Noise Floor
Itotal=Total Received Power= RTWP= Pn+Iown+Iother= Noise Floor + Noise Rise

So
RTWP must be HIGHER THAN Background noise

Thanks

[rimoucha]

Hello Expert,

Could you please tell me how to calculate noise rise based on RTWP (in dBm)?
Do you think that we should consider the Maximum or the mean value for RTWP per cell ?

Best regards,

[tukangoptim]

Thanks, i've found it,but i need UL . Another step will be to campare 2 methods of calculating of % UL Load Factor , and compare it.

I don't like method with User number, because we play with MaxEqvUserNumber - it helps to reduse power congestion on some high loaded cell. But on another hand if i will increase MaxEqvUserNumber - UL load Factor will decrease....looks strange.

For example current ULEqvUserNum - 40, Max 80 %UL load Factor - 50%. But if i set Max to 120 - %UL load factor will be 33%?

If i will use RTWP, it will be more usefull, because RTWP will show real load on cell.

i have found many many cases where rtwp increased with no relation to load at all. thats why huawei prefers to apply enu.
anyway, that is really interesting your UL load reduced to 33% due to that parameter ??

[jayk]

thats not correct formula to calculate uplink load, _lisi4king has already mentioned that..and in fact that was an example just for making people understand..

just to correct you in both algorithms, RTWP effects the network same way. ENU Algorithm has many parameters to control effect of high RTWP but not algorithm1. thats why ENU algorithm is used in uplink CAC