Handover failure

[thiepvt]

Pls anyone help me, can anyone explain for me about used "Counter" for analysis network parameter such as Neighbour,HO,......Thanks

[hassen]

u should différenciate between :


- HO Fail préparation phase (before tch assignement)
- HO Fail execution phase

hi
i think before it called ho lost following by drop call due to low signal as example.

br hassen

[RF engineer]

if you want to know exactly you handover failure reason with specific reason you can check in HO stat reasons( DL/UL level,DL/UL Quality.PBGT,,,,,,) and there can be decided what is the

[electron]

hi my friend

i am agree with you about cross feeder that can cause ho fail but about the raison tch cong i am not sure because after ho decision bsc has assigned a tch to Ms.

br hassen

Dear Hassen,


As you know in GSM technology we have kind of HO that named Hard hand over.According to this kind of HO at first BSC release TCH from serving cell and then assigned to target cell.Some time target cell has not idle TCH therefor BSC will assign MS to last serving cell.Now we suppose that target cell has not idle TCH and we will come back to serving cell it will cause some time HO fail and retry HO and call drop i think every thing is clear now...


Regards
Reza

[hassen]

Dear Hassen,


As you know in GSM technology we have kind of HO that named Hard hand over.According to this kind of HO at first BSC release TCH from serving cell and then assigned to target cell.Some time target cell has not idle TCH therefor BSC will assign MS to last serving cell.Now we suppose that target cell has not idle TCH and we will come back to serving cell it will cause some time HO fail and retry HO and call drop i think every thing is clear now...


Regards
Reza

Hi reza

from signaling A interface about Ho
as you know before bsc release tch from serving cell it should receive ho complete from target cell.
please see attached file GSM Handover Call Flow

br hassen

[thawrani75]

If one Ms is moving from one cell to another cell , but another cell has blocking/congestion, Can handover is completed and not?
Pls clear me about it.
all condition are good for this handover-------.
1> no h/w issue on serving and neighbur cell.
2. handover is define bothway with this cell.
3. no h/w issue.


I hope , this handover is not completed, but this number is VIP, then wht handover is completed ?

pls clear me about this?

[takeiteasy612]

HI guys
Please check the link download, may be it is broken

[Junio]

there is difference between call drop and HO failure if you got HO failure mobile will try to return to last serving cell if it can see good level from it.

As I think

Hi all I try to analysis the Inter-RAT fail and to propose the solutions for to resolve it but it's not easy for me because i have not enough document . can you recommended me the good doc .

Thank a lot .