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27th November 2009 at 02:28 #59784coolGuest
hi.. has anybody experienced this? i have a cell with only ~15% sdcch utilization but experiencing sdcch blocking. what could be the cause? thanks..27th November 2009 at 16:15 #59785ramanGuest
hardware issue….or media having errors ….29th November 2009 at 13:21 #59786JaspreetGuest
It may be due to LAC boundaries.
Also check neighbouring cell’s LAC
due to frequent updations SD blocking is occuring.
Hope this help.
Jaspreet30th November 2009 at 13:52 #59787BijoyGuest
Dont you think SDCCH peak Utilisation will be high in case of very High LU.
Bijoy30th November 2009 at 19:34 #59788JaspreetGuest
you are right(I misread the question as only SD blocking) but In case it is utilized at peak then it wud lead to SD congestion not Blocking because at that time no attempt for SD channel will be made so no point of blocking.
If I m wrong then, you can pls elaborate this as it wud add to my knowledge.
thanks1st December 2009 at 05:37 #59789BijoyGuest
Which system are you working on?
That would help me to explain better.
Also I would like to rectify you that even if there is no free SDCCH (i,e SDCCH Congestion),BSC has no intelligence that it will prevent MS for SDCCH requests to that cell.
Bijoy3rd December 2009 at 14:42 #59790JaspreetGuest
I m working on huawei system.4th December 2009 at 05:04 #59791BijoyGuest
If in Huawei system you are facing such type of issue,check for the following
1.check for HDLC congestion.
2.Check whether you have set “Concentric cell”=”yes” for a normal cell.
3.Check if the feature “Dynamic MAIO” is kept “ON”
Bijoy4th December 2009 at 09:26 #59792MAkarand S DereGuest
Can SDCCH hop & In case of SDCCH when on Non BCCH TRX will radiate by which freq.4th December 2009 at 10:49 #59793BijoyGuest
SDCCH TS will hop if on Hopping TRX,otherwise not.4th December 2009 at 12:43 #59794kenjiGuest
hi bijoy.. how about in nokia system? what should i check when im experiencing sd blocking but low utilization? please help.. thanks,,6th December 2009 at 07:22 #59795AustinGuest
I have this alarm for nokia bts – Working SDCCH channel below threshold. please i need assistant on howto resolve this issue. thanks.7th December 2009 at 05:04 #59796BijoyGuest
Check my reply on the topic”Abrupt nature of SDCCH Blocking in N/W”.
This ratio is set in BSC .The parameter name is “ALSDC”.The recommended value is 30%.
To handle this alarm,you can check the following
1.If any TRX containing SDCCH has gone faulty or blocked.
2.If the parameter ALSDC is set too high.
3.Wheteher Dynamic SDCCH is disabled