PDA

View Full Version : EFD activations FACH to DCH(problem)



dfindme
2013-11-27, 04:07 PM
Hi All,

i have activated EFD to reduce RNC SPU Loads and RTWP, test RRC state DCH to FACH its success,
but having problem slow respond when RRC state form PCH or from FACH to DCH even download start > 60s

any one can give advice. there is regarding timer or initial bit rate to DCH or something?

my current RNC version RAN13

thanks

agenov
2013-11-27, 04:09 PM
check 4A event value as first step.

br

rfsupp
2013-11-29, 05:08 AM
Check the Timer to Trigger or the event 4A FACH -> DCH.
Exist any Fach Congestion?

dfindme
2013-12-03, 12:39 PM
Check the Timer to Trigger or the event 4A FACH -> DCH.
Exist any Fach Congestion?



yes have fach is congest but already add 2 SCCPCH.

thanks you

P.T.E.
2013-12-05, 06:00 AM
yes have fach is congest but already add 2 SCCPCH.

thanks you

Dear try this

Increase FACH IuB Bandwidth
Change in timers for non-EFD users to make it faster for users to go from CELL_FACH -> CELL_DCH and slower to go from CELL_DCH -> CELL_FACH
Change in timers for EFD users to make it faster for users to go from CELL_FACH -> CELL_DCH and slower to go from CELL_DCH -> CELL_FACH

Andryawan
2014-04-04, 08:38 PM
Could we add more SCCPCH (>2 channel) as solution to reduce FACH Congest?
I found this congest occurs even we had 2 SCCPCH.

thank you

radio_network
2014-04-25, 12:04 AM
Dear try this

Increase FACH IuB Bandwidth
Change in timers for non-EFD users to make it faster for users to go from CELL_FACH -> CELL_DCH and slower to go from CELL_DCH -> CELL_FACH
Change in timers for EFD users to make it faster for users to go from CELL_FACH -> CELL_DCH and slower to go from CELL_DCH -> CELL_FACH


can u mention the full command/timer

paulus
2014-09-23, 11:03 AM
Hi P.T.E,

How to increase FACH Iub Bandwidth? What parameter should I change?

Thanks
BR//Paul


Dear try this

Increase FACH IuB Bandwidth
Change in timers for non-EFD users to make it faster for users to go from CELL_FACH -> CELL_DCH and slower to go from CELL_DCH -> CELL_FACH
Change in timers for EFD users to make it faster for users to go from CELL_FACH -> CELL_DCH and slower to go from CELL_DCH -> CELL_FACH

qaqa
2014-09-23, 11:39 AM
As FAr as I remember you cannot go beyond two SCCPCH in Huawei product.
quick fix to FACH congestion will be: 1-reduce your cell footprint, 2-add more channels, 3- accelerate FACH reselection (i.e. enable SIB12). You can also increase the number of users on FACH to 32 or 64 or unlimited but you need RAN14 or greater.
FACH is a predefined BW so I don't think increasing the IUB BW will help.

P.T.E.
2014-09-24, 02:12 AM
using USCCPCHBASIC and USCCPCHTFC

u can refer to huawei support and you will find the script.


Hi P.T.E,

How to increase FACH Iub Bandwidth? What parameter should I change?

Thanks
BR//Paul

P.T.E.
2014-09-24, 02:19 AM
Dear paulus,

please refer to this thread and you will find the FACH script

http://www.finetopix.com/showthread.php?40140-FACH-Congesiton-State-transistion

BR,