- This topic has 32 replies, 1 voice, and was last updated 13 years, 2 months ago by Promod.
7th December 2006 at 09:09 #46263Mahesh GalhenaGuest
I have a problem of improving “Call Setup Success Rate (CSSR)” in Ericsson system.
Please suggest me which parameters can be used to imprve CSSR.
I also have a problem with the definition of CSSR. Is it SDCCH establishment success rate or TCH establishment success rate?
Best Regards,8th December 2006 at 04:24 #46264CelltelGuest
I think CSSR is TCH establishment success rate. When you consider SDCCH establishment success rate, then you consider SMS & GPRS attempts too.8th December 2006 at 04:27 #46265MaheshGuest
Thanks for your comment. Anyway do you have any idea how to improve CSSR in Ericsson system, what parameters can be used?
Best Regards,10th December 2006 at 00:16 #46266pixGuest
you have to isolate different possibilities.. the CSSR is highly dependant on the formula defined by the vendor.. i’m not familiar with the Ericsson one, but there are at least those possibilities :
1. TCH CONGESTION
2. TCH RADIO FAILURE (interference, low coverage)
3. HARDWARE ISSUES (TRX, ANC, TCU)
The CSSR is a very vast indicator, a grouping of different indicators, you have to dig in further to really understand where your issue is, and what action can be taken to reduce it..18th December 2006 at 18:05 #46267AlanGuest
Can some one direct me toward definitions of GSM KPIs?19th December 2006 at 11:14 #46268MaheshGuest
Thanks very much for your idea.
I will go through it and try to improve CSSR in our network.
Best Regards,6th January 2007 at 21:47 #46269AlanGuest
In nokia 2G EDGE network: IF I get TCH Channel failure rate above defined threshold at 50% of the slots of all TRXs in a sector: what could be the probable causes of it?18th January 2007 at 17:12 #46270JRGuest
Sound like a broken TRX to me. have it replaced and check the performance after…
cheers20th January 2007 at 12:31 #46271TufailGuest
I am confused..
wat is the differnce b/w TCH conjection and TCH blocking.
Tufail22nd January 2007 at 07:21 #46272JRGuest
It’s just a different name for the same thing…
TCH congestion = TCH blocking
JR22nd January 2007 at 07:30 #46273TomarGuest
TCH Congestion means, that all channels are busy.
TCH Blocking means, that all channels are busy and the next call can’t to be satisfy.
In some statistical cases TCH Congestion doesn’t mean TCH Blocking. In reality, if you have high TCH Congestion, than you have TCH Blocking (72 second means 2% blocking probability)
Best Regards24th January 2007 at 07:10 #46274EugeGuest
Hi Guyz, CSSR also depends on the SDCCH available coz wen a call is being setup the system sends signals to search for the intended mobile. This signaling requires SDCCH. so if u have few SDCCH & are all occupied @ that time then no signaling takes place for that call. Since signalling comes b4 TCH assignment the call will not be successiful.24th January 2007 at 18:44 #46275AlanGuest
can someone guide me toward some documents explaining the in depth meanings of KPI, like cogestion blocking etc…..will be appreciative….thanks…25th January 2007 at 08:52 #46276RFGuest
TCH congestion mean there is no free TCH to make call or request handoff , and the blocking mean you have no channel to make call then you can’t access to the system which mean blocking
Best Regards26th January 2007 at 08:35 #46277TufailGuest
Thank you very much to all of you.