periodic location update

Hello,

The value of T3212 sets the duration between two periodic location update. Typical value is 3 or 4 hours.
If too short, then resources are occupied too much with signalling (SDCCH, BTS processor, MSC processor, VLR, etc.)

If too long, then it can happen that MS are not accessible anymore (battery died, for example) but the MSC still believe they can be paged.

The drawbacks of a longer value are rather inconsequential … It looks like it’s better to have a value too long than too short 🙂

Now, be careful than the implicit detach timer “t” set in the MSC/VLR is longer than the T3212. Because if it’s shorter, then it means that “t” expires before T3212: the IMSI is detached by the VLR, but the MS is not aware of that…

T3212 is a cell Timer.

Br\\
Bijoy

Pix

is (‘t’ detach timer

the the timer that network will purge the sub

in our network T3212=2.9 H

and network will delete the subscriber after 24 H

is that time thesame for (‘t’ detach timer ??

T3212 value varies significantly between networks, I’ve seen values as long as 12 hours and as short as 2 hours. It really depends on a strategy, LA shapes and sizes and signaling transport capacity. Have in mind that short T3213 value also affect battery life time for MS, especially for low consuming customers.

I guess 3 hrs for T3212 is widely accepted in the world. But it depends on various parameters.

Ayat,

you said:
———————–

1. T3213(periodical timer in Radio) = 174min
2. t(periodical timer in VLR) = 240min (large than T3213, so it is available if the T3213 is not successful)
3. purge timer = 24Hours

————————

the t(periodical timer in VLR) is at a good value, so IMO it means that the MS which are no more “available” are quickly marked as “detached” by the VLR.
So my previous recommendation is actually already done in your network 🙂
the purge timer would not influence your KPI (afaik).

i can’t help more…
pix