3G missing neighbors

[dgk82]

Hi All,
except from DT analysis, how can i check from statistics to find out missing 3G&2G neighbor cells for UMTS network

[romagdinio]

please specify the vendor, However regardless the vendor you can't detect the 2G missing neighbors with Counters because when the UE enters the compressed mode to measure the 2G neighbors it will not scan the whole band it will only measure the 2G neighbors sent to it by the RNC in the measurement control message.

[dgk82]

Vendor is Huawei .

[romagdinio]

so in Huawei you can check the 3G missing neighbor relations by 2 ways:

1- from the CHR Records.
2- check the counter "VS.SHO.AttASU.N" and check if you have any undefined relation that shows a high number, then you should define it.

[zeezzoo]

so in Huawei you can check the 3G missing neighbor relations by 2 ways:

1- from the CHR Records.
2- check the counter "VS.SHO.AttASU.N" and check if you have any undefined relation that shows a high number, then you should define it.

the counter "VS.SHO.AttASU.N" is SHO Attempts between neighbors ==> this means already declared neighbors in the database . you can't detect missing neighbors by using this counter . but by using it you can detect unnecessary neighbors which have 0 SHO attempts .

i know that utran can tell the ue to report the detected set but i haven't read about this . if somebody knows about this kindly share knowledge .

[romagdinio]

the counter "VS.SHO.AttASU.N" is SHO Attempts between neighbors ==> this means already declared neighbors in the database . you can't detect missing neighbors by using this counter . but by using it you can detect unnecessary neighbors which have 0 SHO attempts .

i know that utran can tell the ue to report the detected set but i haven't read about this . if somebody knows about this kindly share knowledge .

Hello,
consider the below example:

if you have 3 cells (Cell A, Cell B & Cell C). consider that Cell C is defined as a neighbor for Cell A, but is not defined as a neighbor for Cell B.
now if Cell A & Cell B are in the AS with Cell A is the best serving cell and if cell C is in the MN and is becoming good, so Cell A will attempt to add Cell C (since Cell C is defined for Cell A), however since Cell B is in the AS with Cell A the addition attempt will be considered an attempt for all cells in the AS (including Cell B which doesn't have Cell C in its neighbor list) and will be counted as an attempt between Cell B & cell C in the counter i sent you before although they are not defined.

however if in another case cell B is the best serving cell in the AS and Cell C is seen with good EcNo Cell B will not be able to add cell C and most probably the call will drop if Cell C continue enhancing.


so you can use this counter to detect missing neighbors

[jan74]

Another way to find missing 2G neighbours is the following (in NSN):

The normal process for ISHO is to enter Compressed Mode, measure neighbouring GSM cells, decode BSIC of best cell, end CM and finally attempt ISHO.

There is a counter in NSN called "is_hho_no_cell_cpich_ecno_rt" and "is_hho_no_cell_cpich_rscp_rt". These measure the guys who measured GSM successfully but did not find a suitable GSM cell. This can be for several reasons but we found that in many cases, it is a good indicator of missing GSM neighbours.

The way I do it is that I take every cell in the network and I measure the number of users who successfully completed GSM measurements and found a GSM neighbour against the ones that did not(i.e. No Cell Found). I then target the worst performing cells and this part becomes manual as you need to look at what GSM cells are in the area.

Hope that helps even if it is a different vendor.

[romagdinio]

the counter "VS.SHO.AttASU.N" is SHO Attempts between neighbors ==> this means already declared neighbors in the database . you can't detect missing neighbors by using this counter . but by using it you can detect unnecessary neighbors which have 0 SHO attempts .

i know that utran can tell the ue to report the detected set but i haven't read about this . if somebody knows about this kindly share knowledge .

for you last part about the detected set reporting you can enable this switch:

HO_INTRA_FREQ_DETSET_RPRT_SWITCH: When the switch is on, statistics on the intra-frequency measurement reports of the detected set are taken

Best Regards,

[mohyedeen_alkousy]

Hi All,
except from DT analysis, how can i check from statistics to find out missing 3G&2G neighbor cells for UMTS network

in Huawei 2G GSM u can check Neighbor cell measurement counters in M2000

Neighbor Cell Level Measurement per Cell(MR.NCellLevl.NCELL)

Overview

The measurement unit is used to measure the mean receive level of the neighbor cell. You can determine whether to configure the neighbor relation based on this measurement.
The neighbor cell can be classified into two types: defined neighbor cell and undefined neighbor cell.
Defined neighbor cell refers to the cell whose BCCH frequency is contained in the BA table of the BSC and that is configured as a neighbor cell of the present cell in the neighbor relation list.
Undefined neighbor cell refers to the cell whose BCCH frequency is contained in the BA table of the BSC (manually added by the user) but that is not configured as a neighbor cell of the present cell in the neighbor relation list.
When measuring the information of defined neighbor cells, the measurement unit is used to measure the redundant cells. When measuring the information of undefined neighbor cells, the measurement unit is used to measure the miss-configured cells. It is recommended to register the NCELL when deploying a new site and delete the NCELL of the cells after network optimization. Register less than 50 cells, or the CPU usage of the XPUM will increased by 10% to 20% at traffic peak.

[oldman]

Hi guy, my queries are the same as well, detecting missing 3G neighbors from counters...

But what about if the vendor is ZTE?