Second paging response ?

[adam07]

hi all;
in my Network (NSN) somme cells answers for the Second paging response with a bad LAC, and ther's no alarmes in those cells. what i can do to fix this problem ?
thk you for your help

[jayk]

What is meaning of Bad LAC? Is it with 3G or 2G Network?

[adam07]

juste in 2G network, for exemple we have a cell with lac 6 and we get the Second paging response with same cell but with lac 8 !

[gprastomo]

still i couldnt get you, its impossible a cell with 2 lac, or maybe the second paging is directly to whole lac in 1 msc???

[adam07]

exactelly the second paging is directly to whole lac in 1 msc, but the problem that the second paging send more responses than the 1er paging (cell 2G NSN and the MSC is Huawei)

[gprastomo]

i think the 2nd paging on whole lac in 1 msc is too much, usually in huawei they have 3 paging repetition, first paging will be tmsi secon will be imsi then 3rd paging will be whole lac.
i think in your case, you need to asses the following :
1. check your loc update timer and it should be less than idle detach timer on msc, to avoid detach by msc before ms send the periodic loc update, so the first paging will be fail.
2. check the timer to supervise the paging response, most probably you can make it longer due to some delay on paging delivery, so first paging will be expired soon then 2nd paging will be sent.