Preferred VoLTE Strategy in NSA Networks

5G NR
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1

Dear all,

In an NSA network, VoLTE has three strategies:

  1. Delete SN: The UE transmits VoLTE only on the LTE carrier, with no NR transmission. This improves VoLTE UL coverage but disables 5G data.
  2. Keep SN: The UE transmits over both 4G and 5G links, with total power capped at the UE’s maximum output.
  3. Dynamic SN: Based on the UL SINR received at the gNB, the network decides whether to keep or delete the secondary node (SN).

Which strategy is most commonly used?

Preferred VoLTE Strategy in NSA Networks
Preferred VoLTE Strategy in NSA Networks1024×1024 169 KB

2

Delete SN.

3

For India?

4

It doesn’t matter whether it’s India or any other market.

For NSA, releasing the SN is better for ensuring good VoLTE quality.

5

Once the VoLTE call is set up, should the 5G leg be released, and data transmission occur only on 4G?

For Huawei vendors, which parameters control this behavior?

6

Yes, correct.

7

Normally, the first option is used.

Ericsson (E//) supports only the first and second options, while Huawei provides all three options.

VolteUeScgMgmtStrategy controls it.

8

I think that during a voice call, the demand for data is minimal. Therefore, voice should be prioritized.

9

Agree.

10

It might be better to implement SCG release during a VoLTE call.

This would prevent power sharing, allow full power allocation to LTE, and maximize coverage without the potential drawbacks of a split.