- This topic has 67 replies, 1 voice, and was last updated 13 years, 8 months ago by Pix.
30th October 2006 at 07:21 #43396GEOGuest
What are the reasons for abis drop in Nokia BTS31st October 2006 at 10:28 #43397yogesh_rfGuest
I am facing a pblm . in INTER MSC handover,handover command is given from one MSC to another(HUWAII and ERICSSON MSC)but one side handover is happening and other side is not happening,will be highly thankful for your comments
yogesh_rf31st October 2006 at 18:17 #43398pixGuest
i got this kind of problems before… but there are lots of possible solutions.
first of all, check that the LAC, CI of the external neighbors cells are defined in both OMCR and in both MSC. 50% of the case, the people in charge of OMCR or MSC will ensure you they did it correctly. Don’t trust them and ask them to check it again thoroughly.
second thing, you can ask a NSS guy to check an internal “addressing” table in the MSC, or something. Unfortunately I can’t remember what is was exactly… I just remember that the external LAC or external BSC wasn’t correctly defined in the NSS, but I’m not able to explain more.
as far as i recall, that’s it… but as i said, many things can go wrong. And most of them are linked to NSS.. sit down around a table with a NSS QoS expert and isolate the problem (problem hapenning during the handover preparation or execution ? where exactly is the failure ocuring ? which message exactly ? on which interface ?).27th December 2006 at 10:52 #43399krishnanGuest
one more solution if u find everthing ok just check the handover controlling party is it the MSC or the BSC .It should be MSC..28th December 2006 at 11:39 #43400yogesh_rfGuest
Case was solved and i think in intermsc HO we should see for BSSMAP between BSC and MSC.
yogesh_rf28th December 2006 at 18:19 #43401tremalnikeGuest
please see matrix of average timing advance per UL RxQual and per RxLev. Rural or city is problem BTS ? May be under antenna ampfiler will help you ….16th August 2007 at 07:15 #43402binhGuest
can i ask everyone some questions ? what is prime reason drop call rate high in GSM ? can you give some document about drop call rate ? Thank you very much17th August 2007 at 08:52 #43403PixGuest
A very high call drop rate is most probably the consequence of one of these two causes :
1. equipment failures (especially poor ABIS links, or faulty BSC/TC boards)
2. poor frequencly planning & poor cell planning (too much overlap, not enough downtilt)
Other problems, such as wrong parameters, low coverage, etc, can also cause problems, but usually not so critical.