Improve VoLTE Latency

Hello Experts.
I am looking for some suggestion to improve VoLTE Latency.
I hope many of experts did some trial before to improve it.
Well so far what we here is below:

  1. “DRXMode” specifically for VoLTE User in SEO region and we observed excellent improvement in volte latency
  2. Also I did the trial on pre-scheduling for Volte user , but doesn’t improve anything on volte part , LTE side good improvement .
  3. We also enable new feature “downlink user plane reduction” in Ericsson but LTE latency improved but no improvement in VoLTE.

It’s Ericsson system.

Any idea or suggestion to improve further?
Looking forwards for your reply.

Hi, for VoLTE part you can check tdiscard timer linked with pdcp profile used for VoLTE qci.
Try to reduce it.
Also drx profile for VoLTE not recommended as it leads to call drop increase for VoLTE can you check pre and post call drop rate after turning on drx.

If you know for Ericsson System, then please help to specific timer.
I missed above “DRX” we already off for VoLTE user.

Try to optmise the scheduler config, timer based on TTI bundling too.
Also VoLTE codec rate change at edges also can be enabled in you have 20.Q1 above.

All are activated already.
It doesn’t work until now.
We are at 21.Q2.

Core Network Cisco, E, H supports post their rel 15 upgrades.

Pdcp discard timer for qci profile can be optimized for latency improvement.

I know for Nokia it’s tdiscard we use.

Understand, but more over its related with UE support.
We try all latest UE handset but codec rate change doesn’t configure.
I think in Ericsson already have TR.
Feature Called VoLTE rate recommendation.

Let me check.