In ericsson W12, is there any reason for a PS data transfer (interactive background) to drop while being on FACH ?
– HS and EUL drops are fine.
– Other cells in the same sector are fine.
– Speech is fine
Apart from the huge FACH drop rate (about 20% !), you would say the cell is perfectly fine…
Any guess is welcomed. Any better technical description of the problem would be great too, as I’m still learning…
ok, i understood that the FACH is totally overloaded on that specific cell. I suspect that’s because of an inter-RNC neighbour right in front of it, so lots of HS->FACH downswitch.
Drops are caused by channel overload.
OK load could be an issue but how do you know that the channel is loaded?
On the other hand as this is a border cell. How are your mobility phase1 and phase2 settings?
Have you tried to increase the power of the channel?
Issue disappeared after the micro 3G site right in front of my problematic cell was swapped –> as soon as it was put in the same RNC, the FACH drop disappeared.
The root issue wasn’t caused by FACH load, as I supposed few weeks ago. Drops occured because it isn’t possible to do a inter-RNC SHO when in FACH. The FACH is supposed to be dropped before the UE moves to the inter-RNC neighbour. It’s a normal behaviour (at least in ericsson).