- This topic has 13 replies, 1 voice, and was last updated 10 years, 5 months ago by akuiser.
26th November 2010 at 06:43 #65131akuiserGuest
I have a problem which is TCH Assignment failure & TCH drop become higher after TRX upgrade.
Any idea why this happened and how to analysis the root cause? Also the solution. Is this cause by hardware?Thank in advance.26th November 2010 at 08:47 #65132bGuest
What vendor r u using?
what type of upgrade?30th November 2010 at 03:02 #65133akuiserGuest
thank for reply.
we are using ALU and we have performed upgrading from 3 to 5 TRX due to congestion issues.Any idea?30th November 2010 at 04:32 #65134TanujGuest
is this in all sites where you have gone from 3 to 5 trx30th November 2010 at 04:42 #65135akuiserGuest
only 1 site.We upgrade this site only on sector 2 & 3 from 3 to 5 TRX. we suspect TRX problem but the problem still persist after change TRX. We also check for new freq applied but it’s clean freq and freq hopping also enable at this site.30th November 2010 at 06:55 #65136PramitGuest
Dear Can you plz confirm whether the problem has been solved?30th November 2010 at 08:57 #65137akuiserGuest
the problem still not solve30th November 2010 at 10:09 #65138TanujGuest
Are there any slips in the dip30th November 2010 at 15:26 #65139K.K.nathGuest
If there are no issue with maio i.e.maio planing are good,then check the RF cables which you for expansion.There may be mino variation of VSWR.Also enable DTX and 4th maio put in low priority.30th November 2010 at 17:54 #65140TanujGuest
Yes check trx connections with the cdu there may be wrong connections1st December 2010 at 07:01 #65141akuiserGuest
ok…we plan to change the RF cable & see how the outcome.beside that, if there any other plan that we can perform? i’m not sure whether this problem was cause by poor coverage at boundry area.What is parameter that i can analysis to confirm this?is it posibble if we increase RXLEV_ACCESS_MIN value?so the cells which having poor coverage can’t access this serving cell & avoid drop call.1st December 2010 at 17:45 #65142pixGuest
in the alu system, you can get more details about your problem :
– check the tch efficiency rate per trx
– check the path balance avg per trx
– check the idle band measurements per trx (if available)
– check the dl rxlev avg & the ul rxlev avg per trx
– check the timing adv avg per trx
– check the noise calls due to abnormal FER per trx
based on those indicators, you can know whether your problem is coverage related (when adding more trx, you add more combining losses, therefore decrease the dl coverage of your cell) ,or interference related, or hardware related.
pix1st December 2010 at 21:24 #65143RexGuest
you didn’t answer to K.K.nath, what is your MAIO planning after upgrade to 5th TRX (if you use SFH). Check whether you use same MAIO for two TRXs from different sectors.
Regards,2nd December 2010 at 09:10 #65144akuiserGuest
thank Pix for details explanation. I will try to get more data & perform further analysis.
currently we applied BBH for this site.
Thank you for all bro for sharing your knowledges.