One PDU session mapped to multiple DRB

5G NR
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1

Hi, can anyone please help to share the example configuration where one PDU session is mapped to multiple DRB, and possible use case also?

2

Brother,

Below is the brief description/basics about the Multiple DRBs per PDU Session:

  • Support for voice calls in NR SA
  • Setup of GBR QoS flow for voice using a dedicated DRB in the PDU Session for IMS Voice
  • Multiple DRBs setup per PDU Session
  • QoS Parameters Modification
  • RLC UM
  • Multiple QoS flows per Session in Mobility

Below are the Supported configuration or limit can be done:

  • 8 PDU Sessions / UE
  • 4 DRBs / PDU Session
  • 1 QoS Flow / DRB
  • 8 DRBs / UE (Baseband limitation)
  • One QoS flow with RTP and RTCP in one DR

Example for it:
image

1 Like
3

Nice information.
Are these limitations from Standard?

4

Yes.
All these are Standard limitations.

5

Hi, thanks for sharing the information.
I have one doubt here… I guess multiple QoS flow can be mapped to single DRB.

image
image1027×435 56 KB

I see on few pictures in different article.
Even as per ASN, it seems multiple QOS flow can be mapped to one DRB as below:

image

Could you please double confirm on this?

6

Yes yes… You can map.
That can be done in UPF by SDF templates.

1 Like
7

Hi
I did not find a description of this limitation from 3gpp specification, could you share the TS?

8

Hello all,

I have seem the following information [EIGHT DRBs PER UE (BASEBAND LIMITATION)] anywhere else in the internet and I would like to understand a little bit more about what these baseband limitations mean, however I have been searching for this specific intel in the internet and in the 3GPP TS but I can’t find it anywhere. Do anyone know a little bit more about it or maybe happen to know the specific document from 3GPP where this information is presented?

Thanks for the attention anyway.