FACH Congestion in Cell Level

[emuvars]

Hi All

Ive been facing FACH Congestion issue in my network which has EFD enable already.
we've done expand the 2nd SCCPCH also. For time being we adjust RNC level parameter related to EFD.
is there any idea to reduce FACH Congestion by cellwise insted of physicall optimization/new site ?

[electron]

Try to push users faster to URA-PCH instead of holding them in FACH state !
Hi All

Ive been facing FACH Congestion issue in my network which has EFD enable already.
we've done expand the 2nd SCCPCH also. For time being we adjust RNC level parameter related to EFD.
is there any idea to reduce FACH Congestion by cellwise insted of physicall optimization/new site ?

[emuvars]

Thanks electron, so the idea is to fasten F2P state.
I wonder to know parameter in cell level to adjust?

[electron]

Hi,


no it is channel switching related parameter (RNC level) but in E/// i guess in W13 onward there will be some cell level channel switching . Also cross check FDH related timers as well it might help you.


Cheers
Thanks electron, so the idea is to fasten F2P state.
I wonder to know parameter in cell level to adjust?

[P.T.E.]

try SF and Iub expansion

[Shakeel_15]

Hello,

Try to optimize state transition timers DCH-FACH.

Check power control as well.

BR

[sabila]

increase BW of FACH from defaul 4500 to 9000,monitor transition state succes rate and drop rate fach.if drop then increase power fach

[qaqa]

Hi Sabila,

can you provide the Script to change the FACH (SCCPCH) BW?

[P.T.E.]

Dear qaqa,

this script for adding 2nd SCCPCH and increasing BW to 9000

DEA UCELL: CELLID=XXXXX;
DEA USCCPCH: CELLID=XXXXX, PHYCHID=8;
DEA USCCPCH: CELLID=XXXXX, PHYCHID=9;
RMV UPCHDYNTFS: CELLID=XXXXX, TRCHID=3, RLCSIZE=240;
RMV UPCH: CELLID=XXXXX, TRCHID=3;
RMV UPICH: CELLID=XXXXX, PICHID=10;
RMV UFACHLOCH: CELLID=XXXXX, TRCHID=4;
RMV UFACHDYNTFS: CELLID=XXXXX, TRCHID=4, RLCSIZE=168;
RMV UFACHDYNTFS: CELLID=XXXXX, TRCHID=5, RLCSIZE=360;
RMV UFACH: CELLID=XXXXX, TRCHID=4;
RMV UFACH: CELLID=XXXXX, TRCHID=5;
RMV USCCPCH: CELLID=XXXXX, PHYCHID=8;
RMV USCCPCH: CELLID=XXXXX, PHYCHID=9;
ADD USCCPCHBASIC: CELLID=XXXXX, PHYCHID=8, SCRAMBCODE=0, SLOTFORMAT=D4;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=8, CTFC=0;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=8, CTFC=1;
ADD UPICH: CELLID=XXXXX, PHYCHID=8;
ADD UPCH: CELLID=XXXXX, PHYCHID=8;
ADD UPCHDYNTFS: CELLID=XXXXX, RLCSIZE=240, TFSNUMBER=D2;
ACT USCCPCH: CELLID=XXXXX, PHYCHID=8;
ADD USCCPCHBASIC: CELLID=XXXXX, PHYCHID=9, SCCPCHOFFSET=100, SCRAMBCODE=0, SLOTFORMAT=D10, TFCIPRESENCE=EXISTS;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=0;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=1;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=2;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=3;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=4;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=5;
ADD USCCPCHTFC: CELLID=XXXXX, PHYCHID=9, CTFC=6;
ADD UFACH: CELLID=XXXXX, PHYCHID=9, TRCHID=4, RATEMATCHINGATTR=220, TOAWS=35, TOAWE=10, CHCODINGTYPE=CONVOLUTIONAL;
ADD UFACH: CELLID=XXXXX, PHYCHID=9, TRCHID=5, RATEMATCHINGATTR=130, TOAWS=35, TOAWE=10, MAXCMCHPI=D13, MINCMCHPI=D0, SIGRBIND=FALSE, CHCODINGTYPE=TURBO;
ADD UFACHDYNTFS:CELLID=XXXXX, TRCHID=4, RLCSIZE=168, TFSNUMBER=D3, TBNUMBER1=0, TBNUMBER2=1, TBNUMBER3=2;
ADD UFACHDYNTFS:CELLID=XXXXX, TRCHID=5, RLCSIZE=360, TFSNUMBER=D3, TBNUMBER1=0, TBNUMBER2=1, TBNUMBER3=2;
ADD UFACHLOCH: CELLID=XXXXX, TRCHID=4;
ACT USCCPCH: CELLID=XXXXX, PHYCHID=9;
ACT UCELL: CELLID=XXXXX;

BR,

[qaqa]

Thank you PTE,
It is still not clear for me where the 9000 BW is defined from the script. can you please provide a detailed information. if you have a H// document abou this change it will be very welcome.
thank you,

[P.T.E.]

Dear qaqa,

BW expansion is related to CTFC parts. and for the document I searched before but I didn't find a document that clearly describe the relation between CTFC and B.W but I think u can find some related docs in 3gpp.

BR,

[AhmadE]

hello Dears,

any replies from one of the solutions?
we have the same problem and we try the SF but we loss the resources so any recommend solution?