Small cell VoLTE call issues

4G LTE
, ,
1

Hi Gents,
I really appreciate any help or hint how to fix some small cell VoLTE call issues faced couple of days ago up to now, issues such as:

  • Voice call delay
  • Breaking voice / robotic voice at the beginning of conversation
  • Muted call for 4 seconds after handover_in from macro to small cell
  • Low throughput in UL and DL around 0.1 Mbps
  • VoLTE call drop caused by small cell
2

Hi,
What’s you UL KPI?
I.e. SINR PUCCH/PUSCH value?
Is it densed overlapped environment?

3

There are some small cells placed at small offices, each one is capable to attend 20 RRC connected users.
Radio conditions are ok - CQI/SINR.
The point is that it is common pattern over Every small cell with this kind of issues.
Small offices and residential places.

4

Yes, SINR is in UL as well calculate by eNodeB.
Need to check value because due to poor SINR interruption there for ack /nack, RTP packet flow .
UL bler another issue for VoLTE.
What’s your target BLER UL for qci1 set?

5

Please share some UE logs to have a look.

6

I’m trying to replicate the same scenario with a small cell in hands (walk test).
For now just have access to counters/kpis.