Missing Neighbor
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Transcript of Missing Neighbor
Missing Neighbor Missing Neighbor Detected, GSM Symmetry
This is a GSM event based on phone data.It does not require a cell file.
Triggered in when the source cell of a handover is not in the target cell’s
neighbor list.Cells are compared with respect to ARFCN and …
Answered: What is Missing Neighbor Detected, GSM Symmetry in TEMS Investigation?
Missing neighbour doesnt mean there is handover failure, there are many reason for HO failure, eg,
target cell is blocking or have bad KPI so source cell couldnt perform HO when HO is triggered.
For your inquiry above, i think TEMS have methode to justify the missing neighbour event.
If im not wrong, when we perform drivetest using scanner and ue, tems always compare the best server
from the scanner and best server from ue, if there is difference between best scanner and best ue, so it
will count as missing neighbour.
CMIIW.
but for sure you must ensure that the neighbour must be defined apropriately in the database. Some
time tems do the illogical missing neighbour event, so you should crosschek between the drivetest and
live network database
I got a missing neighbor between these two sites but the no handover failure, so does it mean that
there’s a mistake in the neighbor relation between these two sites or there is another reasons for
missing neighbor event…
Thanks
In GSM most neighbor relations are symmetric, also called mutual which means that you will be able to
do handover from CellA to CellB , and from CellB to CellA. when you do a handover from CellA to CellB
TEMS checks the neighbor list if handover from CellB to CellA is defined in CellB. If not defined a missing
neighbor detection is triggered, that is most likely the reason you are getting that message. So if you do
the drive test in the opposite direction the handover from CellB to CellA will not take place. just
doubleclick over the missing neighbor report to see the source and target cell relation you must define
in the bsc. Br, you know where the reputation and thanks buttons are if it helped.
please I need any strategy for neighbor relations......when I should add and what to add ....what to
delete and avoid
Thanks and reputation for all
Hi frien,
The neighbour should be defined effectively as the database has maximum neighbour definition. And
should be inline with operator strategy, eg operator has more DCS spectrum than GSM...
1. define the neighbour on the first layer, for rural area define till second layer etc
2. the neighbour definition should be bothway as previous post by elche
3. parameter should consistent each other, as i have post on other post
4. GSM GSM HO,GSM DCS HO, DCS GSM HO and DCS DCS HO parameter should be define properly
(layering strategy) both on idle and dedicated mode, to absorb traffic on DCS, avoid ping pong HO.
5. Handover feature could be implemented to improve the performance, eg Quality HO margin, traffic
HO, fast uplink, speed sensitive handover.
6. Monitor the statistical performance
I have a good method for processing neighbor and want to share here:
-Step 1: Get the neighbor in the System and import to planning tool ( i use Asset, but you can use other
one).
- Step2: Plan neighbor in the planning tool.
- Step3: Planning tool will compare two data (neighbor from system and from planning tool), then it will
give the missing neighbors.
- Step 4: Because some neighbors are not accuracy (many reasons), so we need have some tips for this
method more accuracy.
+ Must have a good neighbor plan.
+Or: You can use a performance tool to check again. For instance, you can check Handover Matrix and
delete wrong neighbors.
Do all the steps above, you will have a good neighbor plan and do not need to many times.
After applying the procedure suggested by gprastomo,
dont forget to drive test and verify actual performance.
Sometimes, 3 or more tier neighbours have to be added (to minimise drop calls) depending on the site
density, tall overshooting sites, hilly terrain, etc.
Cell-pair adjacency report and drive test data are complementary.
Why I Can not download in the forum?
Help me.
I abolish the missing neighbors in two ways:
- Drive Test tool for testing the problems and Postprocesing Tool (Actix Analizer tool Audit Neighbor
List);
- Study Handoff Statistics using the system Genex Nastar.