Cannot HO to neighbour cells !

[iCloud]

Hi Bro
Pls help me for this problem:
We've just onair new-site, but when doing DT, MS only HO between sectors, cannot HO to neighbour cells:
- Check NBLs, OK
- No alarms about transmission, WSR, check hardware ( power, installing ) OK
- Change control Card ( SUMA, Alcatel BTS ).
- Delete all parameters and configure again
- Synchronous OK
Can anybody give me another solutions for this ?
Many tks for ur supports

[ninoy_122184]

Hi Bro
Pls help me for this problem:
We've just onair new-site, but when doing DT, MS only HO between sectors, cannot HO to neighbour cells:
- Check NBLs, OK
- No alarms about transmission, WSR, check hardware ( power, installing ) OK
- Change control Card ( SUMA, Alcatel BTS ).
- Delete all parameters and configure again
- Synchronous OK
Can anybody give me another solutions for this ?
Many tks for ur supports

Hello,,

Please check the neighbor list of the existing neighbor sites,, maybe the new site is not defined as neighbor that is why there is no hand over,
in short please check your neighbor list parameters:victory:

[plannerguy]

Hi

1)Is the same HO not happening to a particular sector or for all inter cells.
-if above is true then check wether inter HO is disabled for site.

2)Else Compare the problamatic defnition with other relations.

[iCloud]

Hello,,

Please check the neighbor list of the existing neighbor sites,, maybe the new site is not defined as neighbor that is why there is no hand over,
in short please check your neighbor list parameters:victory:
Tks for ur reply
All defined para are ok, bro . Haiza

[ninoy_122184]

Tks for ur reply
All defined para are ok, bro . Haiza

This problems usually happen on new on air integrated sites,double check the site parameters..cheers..!:handshake

[iCloud]

Hi

1)Is the same HO not happening to a particular sector or for all inter cells.
-if above is true then check wether inter HO is disabled for site.

2)Else Compare the problamatic defnition with other relations.

Hi mate
TKs for reply
HO can be done between sectors, but cannot HO to neighbour
In KPI calculation, HOSR is ok. But when doing Driving Test, we cannot handover to another cells

[ninoy_122184]

Hi mate
TKs for reply
HO can be done between sectors, but cannot HO to neighbour
In KPI calculation, HOSR is ok. But when doing Driving Test, we cannot handover to another cells

Check also the adjacent neighbour cell frequency,, example for wimax tech...if they have the same frequency it will not handover

[iCloud]

Check also the adjacent neighbour cell frequency,, example for wimax tech...if they have the same frequency it will not handover
Hic, all paras is ok mate.

[jayk]

Hic, all paras is ok mate.

I face similar issue before. We found out the mismatch of Clock. One of New Site does not have standard clock so there were issues of incoming/outgoing handovers. If you can check, clock freq. of site by OSS or by using Freq. Meter than you can conclude something. Other way is that you can put clock of site in Free Running mode. Add thanks & reputation if you find it useful.

[ninoy_122184]

I face similar issue before. We found out the mismatch of Clock. One of New Site does not have standard clock so there were issues of incoming/outgoing handovers. If you can check, clock freq. of site by OSS or by using Freq. Meter than you can conclude something. Other way is that you can put clock of site in Free Running mode. Add thanks & reputation if you find it useful.

very well explained..hope the explanation of jayk will help you on your issue...:victory:

[stream19]

same case is usally happining with nokia sites (we have to check the clock with bts manager, recreation the neighbors or recreation the site
thanks

[iCloud]

I face similar issue before. We found out the mismatch of Clock. One of New Site does not have standard clock so there were issues of incoming/outgoing handovers. If you can check, clock freq. of site by OSS or by using Freq. Meter than you can conclude something. Other way is that you can put clock of site in Free Running mode. Add thanks & reputation if you find it useful.

Many tks for your reply
We already face with this problems before. And easily, we found that the fault come from synchronous of BTS transmission. But this site, no alarm from transmission. We used MW in this site, cascade to another site, and both of them didn't have any problems from transmission. In NPO system, we can see HO between sites through HO matrix. But in Driving Test, we cannot HO.
If something happen in clock system, I think alarm will appear
After I change SUMA card ( alcaltel System), one sector can HO to neighbour, but others still cannot
Boring

[iCloud]

same case is usally happining with nokia sites (we have to check the clock with bts manager, recreation the neighbors or recreation the site
thanks
Most of faults like this came from clock system
Haizza, but I checked clock, re-create site, re_create NBLs. Still fault :((

[ninoy_122184]

Most of faults like this came from clock system
Haizza, but I checked clock, re-create site, re_create NBLs. Still fault :((

you said that all parameters are okay,,try to hard reset the BTS..:)

[captain_jejemon]

first of all what kind of handover? 2g to 2g? irat?
1. first check clock sync.
2.double check both parameters (neighbor and serving)
3. neighbor definition. int/ext , both ways and measuring freq.(MF)
4. space diversity? radio unit equipment! if more than 4 trx per unit?

[captain_jejemon]

if you try to force handover what happens?

[iCloud]

first of all what kind of handover? 2g to 2g? irat?
1. first check clock sync.
2.double check both parameters (neighbor and serving)
3. neighbor definition. int/ext , both ways and measuring freq.(MF)
4. space diversity? radio unit equipment! if more than 4 trx per unit?
Tks for ur reply
It's 2G to 2G system. ALU BTS and 2/2/2 Configuration. All defined para is ok. Reset, change control card done :(
First, it cannot HO between sector, neighbour cell. After reset and defined para again, it can HO between sector, but cannot to neighbour. Then change control card SUMA, one sector can HO normally, two others cannot :(

[melkaiy]

dude,

please check if the neighbors are added two way and check the ho margin and ho threshold (add and drop thresholds). I mostly encountered this for newly up sites and figured out that the thresholds are not configured properly and there are times that the sites are blocked. You should also checked if the sites are blocked because even if you checked that the parameters set properly, there will be no ho event for blocked sites.

I hope this one helps.. please add reps if you like. . . :)

[melkaiy]

dude,

you can also check the MAIO is set properly. MAIO is the one that separates the traffic that hops in same frequencies with same hopping sequence number (HSN).

check this one I think there's a wrong configuration in the MAIO. THis one also affects the ho in gsm.

if you like this please add reps :)

[melkaiy]

in bts you can actually see if the fault is due to out of sync gps clock so I think that is not the problem because you said it has no alarm. What is the reason in the layer 3 message? DUde, if you drive test did you synch the ms in the pc suite?


If this one helps please add resp if u like :)

[melkaiy]

You said you changed the SUMA card ryt? try to exchange them in slots that does not ho.. And if that works then the prblem is hardware

[captain_jejemon]

check the measuring freq. make sure all freq of neighbor define are in MF lists

[iCloud]

You said you changed the SUMA card ryt? try to exchange them in slots that does not ho.. And if that works then the prblem is hardware
Do u mean problem from the mainboard of BTS ?

[iCloud]

check the measuring freq. make sure all freq of neighbor define are in MF lists
Ys, freq is the basic thing that must be checked in first time :D
No matter come from this, mate

[Alex_R]

Hi mate
TKs for reply
HO can be done between sectors, but cannot HO to neighbour
In KPI calculation, HOSR is ok. But when doing Driving Test, we cannot handover to another cells

Dear
as the HOSR is fine for this site, i consider incoming and outgoining, so you can just check TEMS as there is a feature which prevent HO from selected frequencies

[iCloud]

Dear
as the HOSR is fine for this site, i consider incoming and outgoining, so you can just check TEMS as there is a feature which prevent HO from selected frequencies
Hi mate
Could u pls give more details for this ?
MS also was working fine in another sites

[scorpion]

Very simple...perform the following.

Compare all Parameters of All Cells Nighbour Cell deifintion [Compare the SEcotr where HO is normal to neighbour with Other SEcot defintions ].
Perform Drive test normally (Dont force anything in TEMS) in all 3 secotors.
Post the L3 Messages in this forum in EXT format also Details of cells.

Is the neighborcell belongs to same LAC ? or Different LAC ?
Is the neighborcell belongs to same BSC ? or Different BSC ?
SW Level is same ?
If the BSCs are different then Check the BSC Parameters also.

Based on your inpout let us see the log file and find the issue...

[maoper11]

Check:
the neighbors are bidirectional
neighbors list per cell is not more than 16
what kind of handover are you trying to do (Hard, Soft, Softer, iRat, inter-freq)?

input the command LST UINTRAFREQNCEL and verify cell by cell the bidirectional neighbor.

[rashedsobuj]

also u can check the power parameter on the side as like PBGT,LAYER etc..

[cosmin177]

Very simple...perform the following.

Compare all Parameters of All Cells Nighbour Cell deifintion [Compare the SEcotr where HO is normal to neighbour with Other SEcot defintions ].
Perform Drive test normally (Dont force anything in TEMS) in all 3 secotors.
Post the L3 Messages in this forum in EXT format also Details of cells.

Is the neighborcell belongs to same LAC ? or Different LAC ?
Is the neighborcell belongs to same BSC ? or Different BSC ?
SW Level is same ?
If the BSCs are different then Check the BSC Parameters also.

Based on your inpout let us see the log file and find the issue...

For neighborcell you can use Agileto GOLD EDITION.
It is FREE and very usefull.

See their page: http://www.agileto.com/goldedition.html

http://www.agileto.com/img2/GE_NB_IntraFr.jpg

[cosmin177]

Hi Alex_R,

did u fix the problem?

[dtvt2]

Check system info 5&6, measurement reports. Something's wrong in NCC permitted
dtvt2