Change timer T305 and T308 in E///

[michael.pangkerego]

hi..

Newbie just curious, your collegue just change the timer at MSC Side?or also timer at RADIO change like T200?
Thanx before...

[michael.pangkerego]

hi auto_art

The Core and Radio in this situation, all E///?

Hi pl go through attachement..it is detailed explaination.

i recieevd it from E*******.!

it includes commands to change too..!

[auto_art]

hi auto_art

The Core and Radio in this situation, all E///?

yeaah..all E///. but it should work for different BSS/ Core also as it is not a additional feature.

[michael.pangkerego]

Thanx auto_art...
Btw, I send PM to u, cause newbie can't download ur attachment

yeaah..all E///. but it should work for different BSS/ Core also as it is not a additional feature.

[ventinel]

it will definitely improve DCR.. trial was made here and massive improvement was seen

hi
one of my collegue changed timer T305 and T308 in E/// from 30s to 1s.

and he has observed in improvement in tch rop rate from 0.9 to 0.8 at nbh.

pl share your views.

[Ericsson_RND]

Dear All;

Based on below equation please provide optimum values for mentioned parameters if T305=2s and T308=2s,which need to be set to obtain good improvement on DCR.

T305 + 2*T308 < (N200+1)*T200

[road2nowhere]

Let's be honest.....it doesn't improve the actual DCR, it just hides the T200 failures.....

As RF engineers, our objective should be to improve user perception, not manipulate KPIs.......

PS: I am not trying to point out anyone here ,just a general suggestion, that T305 & T308 should be standardized, but not for improving DCR.

[Muhammad Imran Rafique]

Dear road2nowhere,

As it is not subscriber perceived drop rate, so no harm to have short values of T305 & T308 as low as 1sec.

BR//
Imran

[road2nowhere]

Hi Imran,

Can u explain, why it is not perceived by the subscriber ?

user A --> excellent radio conditions
user B --> poor uplink
user A cannot hear user B clearly
user A disconnects the call
user B call should also be disconnect but the procedure to disconnect is long resulting in T200 failure on user B before the call is released, hence we shorten the timers..

But the issue remains, the subscriber perceives poor quality !!!....which we have tried to hide, very cleverly........

So there is harm......whether the user perceives a call drop or not.........the radio conditions are poor ....period !!

[Ericsson_RND]

Hi Imran;

Thanks , but can you let me know what are obtimum values for N200 & T200 to achive below equation while set T305 & T308 as low as 1sec.


T305 + 2*T308 < (N200+1)*T200