No handover after upgrade from 10 MHz to 15 MHz in one Sector

Dear Experts.

I have an issue on LTE.

I have a site with one L1800 carrier.
In one sector, bandwidth was upgrade from 10 MHz to 15 MHz.
But it don’t have any HO on the cell.

I have defined interfreq on collocated cells.

Vendor is Nokia.

LNHOIF - IRFM
Deactivated ANR
Deleted all LNADJ and LNREL
Then activated ANR

Admin note: this post was updated with image below.
image

Was cell halted and restarted correctly?

BW also need cell to be halted before.

Yes, it was.

No attempt for incoming and outcoming?

Intra freq is 0 on the cell.

Inter freq also 0.

E-UTRAN Inter-Freq HO Att

Why 1 cell…not in a cluster or many cells?

Was just to show to customer the workaround.

BB not enough to enable all the cells.

Try in 3 cells on that site?

Not possible for now.

Only 1 cell can be upgraded.
Due to BB limitations.

They have to install 1 FBBC.

Throughput improved:

DL_User_Throughput

Yes because PRB increased.

Indeed. But my concern is HO.

It is kind of difficult to troubleshoot through WhatsApp, however my recommendations:

  1. Discard Hardware issues (RRU, BBU, Transmission status for X2 links, S1 link), since this is only one cell.

  2. Discard Configuration on the following parameters:
    2.1 Intra-Freq HO: enableBetterCellHo, enableCovHo, actLTES1Ho, prioTopoHO
    2.2 Inter-Freq HO: actIfHo, eutraCarrierInfo
    2.3 LNHOF: eutraCarrierInfo, measurementBandwidth
    2.4 IRFIM: dlCarFrqEut, measBdw,

  3. Verify that ANR is enabled and working, maybe delete all LNREL and let the ANR create them again.

Oh much thanks my friend!

Just seen the parameter i forgot: actIfHo
Forgot to enable thisfor IF to start working

All others parameters well set and LNHOIF defined.

ANR part done before: deactivation, deletion, activation.

Thanks!

Live measurements - IFHO working:

And what is the value for the another cells (with bw = 10 MHz)?

True.

I enabled it on the 3 cells with differents LNHOIF.

  • S1 is in 15 MHz
  • S2/S3 are 10 MHz

Ah ,ok.