1st Neighbour is the same as serving Cell

[clearcincom]

Hello to all,

I'm drive testing a 2G network and have observe the following in the TrioRail drive test system.

BCCH serving cell is ARFCN=960 with BSIC=0-0 and CIC=10031
1st Neighbour BCCH is ARFCN=960 with BSIC=0-0

There is only 1 cell with BCCHFREQ=960 and BSIC=0-0. I've seen the same behaviour on other cells in the same network whereby the 1st neighbour is always the same as the serving cell.
The network is 2G GSM-R NSN.

Anybody any clue?

Kind Regards,
Martijn

[Piscean21]

Dear it will be dual band network.That is what it is showing BCCH level of the serving cell as nbr.

Hope this helps

[clearcincom]

Hi Mudassar,

Thanks for your reply but I don't understand it. Do you mean to say that the BSC BR10 database is configured as a DUAL-BAND network?

Regards,
Martijn

[Piscean21]

No I mean to say that Tems is only showing serving cell as a NBR in case of dual band cells. For monoband cells you won't observe this.

[clearcincom]

Ok. Clear.

The network I'm mentioning is a mono band network and therefore I posted this issue because indeed it should not mention the same information in the serving and neighbour field.
Any idea what could cause this?

[jayk]

Hello to all,

I'm drive testing a 2G network and have observe the following in the TrioRail drive test system.

BCCH serving cell is ARFCN=960 with BSIC=0-0 and CIC=10031
1st Neighbour BCCH is ARFCN=960 with BSIC=0-0

There is only 1 cell with BCCHFREQ=960 and BSIC=0-0. I've seen the same behaviour on other cells in the same network whereby the 1st neighbour is always the same as the serving cell.
The network is 2G GSM-R NSN.

Anybody any clue?

Kind Regards,
Martijn

I think there is no disadvantage of showing serving cell in Neighbor list but it helps in analysis of log files.. it is easy to compare rx levels of serving with neighbors. Even in idle mode its easy to compare C1/C2 values with other neighbors. One more thing is that it is about drive test, there is no connection with NSN or Eric or Huawei. Name of Window in TEMS is "GSM Serving+Neighbors" if you check it ... so it is normal.
Jack
Add Repo/Thanks if you find it helpful.

[plannerguy]

Hi

same is due to the window in TEMS , Serving+Neighbors.

Regards
Plannerguy

[EngSoft]

Hello to all,

I'm drive testing a 2G network and have observe the following in the TrioRail drive test system.

BCCH serving cell is ARFCN=960 with BSIC=0-0 and CIC=10031
1st Neighbour BCCH is ARFCN=960 with BSIC=0-0

There is only 1 cell with BCCHFREQ=960 and BSIC=0-0. I've seen the same behaviour on other cells in the same network whereby the 1st neighbour is always the same as the serving cell.
The network is 2G GSM-R NSN.

Anybody any clue?

Kind Regards,
Martijn

Hi there,

first of all you cant have a NBR define that have the same BCCH as serving cell . the system will not allow it ( E******* and Huawei and NSN as i know ) so you have two possibility

1. You reading it wrong.
2. TEMS bug ( DT TOOL ) , sometime the DT tool will report the Serving cell twice once in the NBR tab , it is a known bug.
3. You have National roaming and your network RX level is so low that it try to pick other operator .

[freakturd06]

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[smarty.rf]

Hi All,

this is nothing but your network is enabled with own MBCCH list, that's why it shows serving cell 2 times.